WO2012110819A1 - Smoking articles - Google Patents
Smoking articles Download PDFInfo
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- WO2012110819A1 WO2012110819A1 PCT/GB2012/050349 GB2012050349W WO2012110819A1 WO 2012110819 A1 WO2012110819 A1 WO 2012110819A1 GB 2012050349 W GB2012050349 W GB 2012050349W WO 2012110819 A1 WO2012110819 A1 WO 2012110819A1
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- Prior art keywords
- tobacco
- yields
- smoke
- smoking article
- blend
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D1/00—Cigars; Cigarettes
- A24D1/18—Selection of materials, other than tobacco, suitable for smoking
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
- A24B15/10—Chemical features of tobacco products or tobacco substitutes
- A24B15/16—Chemical features of tobacco products or tobacco substitutes of tobacco substitutes
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
- A24B15/18—Treatment of tobacco products or tobacco substitutes
- A24B15/24—Treatment of tobacco products or tobacco substitutes by extraction; Tobacco extracts
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
- A24B15/18—Treatment of tobacco products or tobacco substitutes
- A24B15/24—Treatment of tobacco products or tobacco substitutes by extraction; Tobacco extracts
- A24B15/241—Extraction of specific substances
- A24B15/245—Nitrosamines
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
- A24B15/18—Treatment of tobacco products or tobacco substitutes
- A24B15/24—Treatment of tobacco products or tobacco substitutes by extraction; Tobacco extracts
- A24B15/241—Extraction of specific substances
- A24B15/248—Heavy metals
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
- A24D3/10—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/12—Use of materials for tobacco smoke filters of ion exchange materials
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
- A24D3/163—Carbon
Definitions
- the present invention relates to smoking articles and, m particular, to smoking articles which combine two or more technological applications that individually reduce the machine measured yields of specific constituents or groups of
- Tobacco smoke is a complex, dynamic mixture of more than 5000 identified constituents of which approximately 150 have been documented as being
- the constituents are present in the mainstream smoke (MS) which is inhaled by a smoker and are also released between puffs as constituents of sidestream smoke (SS).
- MS mainstream smoke
- SS sidestream smoke
- Tobacco treatments have sought to reduce or remove compounds from tobacco material prior to incorporation into the smoking article.
- Various ways of "diluting" the tobacco in the tobacco rod of a smoking article have been attempted, using various types of diluents or fillers.
- Other approaches have involved ventilation of the smoking article, where ambient air is drawn into the smoking article to dilute the MS. Filtration is obviously another area where much work has been done to enhance the removal of MS constituents as they pass through the filter section of the smoking article. All of these individual measures have benefits, but they generally only address a small part of the picture.
- a further issue to be addressed is the importance of pioducing a product which is acceptable to the consumer.
- Much of the sensory impact of a conventional smoking article is based upon the constituents of the MS. Removing some of these has the potential to provide the smoker with an unsatisfactory smoking experience.
- Oveiall reductions in smoking machine measured toxicant yields can be achieved by diluting the smoke using filter ventilation or using cigarette papers with high permeability, and, m the case of toxicants that are associated with the particulate phase of smoke, by increasing the filtration efficiency of the filter.
- governments and public health authoiities in various parts of the world considered lower ISO tar yielding cigarettes as a way to reduce the health risks of smoking for those smokers who do not quit smoking.
- This product modification approach has more recently been highly criticised.
- the Study Group on Tobacco Product Regulation (TobReg) of the World Health Organization has recently proposed a regulatory approach that would limit the yields of a selected group of specific smoke constituents. This group also recommended that the yields of constituents should be limited on the basis of their yields measured with an intense smoking machine regime and determined per mg of nicotine.
- Appioaches to selectively reducing specific smoke constituents relative to machine measured tar and nicotine yields are very dependent upon the physiochemical nature of the individual constituents.
- Conventional cigarette design parameters offer limited scope for relative reductions in the smoke constituents. For example, by increasing the filter efficiency of a conventional cellulose acetate (CA) filter, the particulate phase constituents are reduced with the tar and nicotine and little or no selective reduction occurs. And, since cellulose acetate filters have little or no effect on volatile constituents, increasing filtration efficiency increases the ratios of their yields relative to tar and nicotine.
- CA cellulose acetate
- Increasing filter ventilation has varied effects on the smoke constituents.
- the absolute yields of all the smoke constituents are reduced, but, relative to tar or nicotine, yields of most of the particulate phase constituents are unchanged or may even be increased.
- the yields of some of the volatile constituents, such as ammonia and carbon monoxide, are reduced relative to both tar and nicotine, while the relative yields of some of the semivolatile constituents such as phenols are increased.
- volatile vapoui phase components such as the volatile aldehydes and hydrogen cyanide may be selectively reduced using adsorbent materials m the filter such as activated charcoal or certain resins.
- adsorbent materials m the filter such as activated charcoal or certain resins.
- permanent gases such as carbon monoxide and nitric oxide, are not amenable to adsorption at room temperature, and toxicants m the particulate phase cannot be selectively reduced by filtration since they are largely bound into the aerosol particles.
- Adsorbents there is a need to operate under high flow rate conditions (approximately 1 L per mm for typical machine-smokmg conditions), and therefore very short contact times between smoke constituent and filtei adsorbent (of the order of milliseconds).
- Adsorbents also need to function at the gas-sohd interface (i.e. not m solution) and m the presence of thousands of other chemicals in both vapour and particulate phases.
- Adsorbent surfaces are also susceptible to blocking by condensing smoke aerosol particles. For permanent gases, and smoke constituents with high vapour pressures at ambient temperatures such as formaldehyde, acetaldehyde or HCN, physical adsorption has been found to be less effective and alternative routes are required.
- Cigaiette smoke contains a number of volatile aldehydes, both saturated compounds such as formaldehyde, acetaldehyde, propionaldehyde and butyraldehyde, and unsaturated compounds such as acrolein and crotonaldehyde.
- Carbonyls m cigarette smoke are mainly generated by combustion of a number of tobacco constituents, mostly carbohydrates. In particular it is thought that sugars are major sources of formaldehyde in cigarette smoke.
- Cellulose has been suggested to be the major precursor of mainstream smoke acetaldehyde.
- glyceiol a material sometimes added to tobacco as a humectant, is an additional precursor for acrolein.
- a promising approach to achieving substantial specific reductions in particulate constituents from a conventionally structured cigarette is to modify the tobacco.
- Substitution of different tobacco varieties into the blend can have an impact on yields of several smoke constituents. For example there are higher yields of the nitrogen containing smoke constituents from burley tobacco than from flue cured or oriental, and higher yields of formaldehyde and catechol from flue-cured tobaccos.
- decreases in one constituents or set of constituents are often offset by increases m other constituents. To avoid this it would be useful to be able to identify and remove precursors to smoke constituents from the tobacco leaf.
- nitrosamines such as NAT and NAB
- TSNAs nitrosamines
- the major precursors for the volatile carbonyls, ben2o(a)pyrene, carbon monoxide, benzene and toluene are the structural carbohydrates such as pectin and cellulose as well as the sugars.
- the nitrogenous smoke constituents are formed from nitrogenous precursors in the leaf, and there is considerable evidence that protein and amino acid combustion contributes to the generation of several nitrogen containing smoke constituents on the Health Canada hst.
- Tobacco protein is also strongly correlated with the formation of mutagenic heterocyclic amines and the resulting mutagenicity of smoke condensate m the TA98 Ames assay.
- the polyphenols m tobacco are major precursors for phenolic smoke compounds. Chlorogenic acid, the most abundant polyphenol in flue-cured tobacco, is a major precursor for phenol, catechol and the substituted catechols, while hydroquinone has also been reported as a chlorogenic acid pyrolysis product. Rutin and caffeic acid also generate catechol and substituted catechols on pyrolysis but because of their low concentrations in tobacco and because of their lower pyrolytic yields their contributions to catechol in flue-cured tobacco smoke are much less than
- Resorcinol is known to be a major product from pyrolysis of rutin.
- the present invention provides combinations of bespoke tobacco blends with bespoke adsorbent filter additives, which result m a smoking article having a significant reduction in mainstream smoke constituents considered to be undesirable.
- the present invention provides a smoking article comprising at least two of:
- a tobacco blend comprising one or more tobaccos or tobacco grades with low TSNA and/or metal content
- a tobacco substitute sheet comprising a non-combustible inorganic filler, a binder and an aerosol generating means
- the smoking articles according to the invention have a reduction in at least 75%, preferably at least 90% and more preferably m all of the key constituents of mainstream smoke, as defined herein.
- the so-called "key constituents" of MS referred to m connection with the present invention are those smoke constituents which have been identified m the literature as being undesirable (see, for example, The Scientific Basis of Tobacco Product Regulation: Report of a WHO Study Group (2007) WHO Technical Report Series 945, Geneva) and/or those whose yields have been analysed m the data provided herein (see, for example, Tables 6, 7 and 8).
- the reduction is preferably determined using one of the smoking machine conditions set out m Table 3.
- the reduced yields are measured under Health Canada Intense smoking machine conditions.
- the reduction m yield of the key constituents is preferably at least 5% oi at least 10% or more.
- the smoking articles of the present invention include a tobacco blend comprising one or more tobaccos or tobacco grades with low TSNA and/ or metal content, they further comprise two or more other technologies listed as (b) to (e).
- Figure 1 shows Table 2, setting out the cigarette construction details.
- Figure 2 shows Table 4, setting out the major constituent yields of test cigarettes using different smoking machine condition.
- Figure 3 shows Table 5, setting out the blend metal and tobacco-specific nitrosamine contents.
- Figure 4 shows Table 6, setting out the MS yields of metals and TSNAs measured under Health Canada Intense smoking machine conditions.
- Figures 5A, 5B and 5C show Table 7, setting out the MS yields of other smoke constituents measured under Health Canada Intense smoking machine conditions.
- Figure 6 shows Table 8, setting out the MS yields of carbonyl and miscellaneous volatile and vapour phase smoke constituents in control and triple stage filter EC measured under Health Canada Intense smoking machine conditions.
- Figure 7 shows Table 9, setting out the MS yields of carbonyl and miscellaneous volatile and vapour phase smoke constituents in control and dual stage filter EC measured under Health Canada Intense smoking machine conditions.
- Figure 8 shows Table 10, setting out the sidestream smoke yields under ISO smoking machine conditions
- Figuie 9 shows a comparison of HCI machine toxicant yields from ECs (lmg ISO) with those from published data sources.
- Figure 10 shows a comparison of HCI machine toxicant yields from ECs (6mg ISO) with those from published data sources.
- FIG 11 shows a comparison of Total Toxicant Yields (TTY) between EC yields and published HCI yield data.
- Figure 12 shows a comparison of total yields from a subset of toxicants (TSY) between EC yields and published HCI yield data.
- Figuie 13 shows a comparison of total normalised toxicant yields (NTT) between ECs and published HCI yield data.
- Figure 14 shows a summary of the process by which high activity polymer-derived carbon is prepared.
- Figure 15 shows Table 15, setting out the smoke and biomarker changes for test products as compared with a control cigarette.
- Figure 16 shows the in vivo study design.
- Figures 17 and 18 show the results of the in vivo study.
- Figure 19 shows a smoking article design according to an embodiment of the invention.
- the first stage in the design of a cigarette-based PREP involved the development of technologies which reduce the yields of smoke constituents.
- Experimental cigarettes ECs were assembled using these technologies and then assessed for their constituent yields using smoking machines; comparison to relevant control and reference products indicated the effectiveness of the cigarette design in generating reduced yields of constituents.
- Those ECs which are found to reduce smoking machine measured yields of smoke constituents, m comparison to reference products, are termed "reduced machine-yield prototypes" (RMYPs).
- the inventors have described different individual technological approaches to the reduction of constituents m cigarette smoke, one of which involves the selection of tobacco blend components to provide a blend with reduced levels of the known precursors of undesirable smoke constituents, two of which modify the tobacco and two of which modify the cigarette filter.
- the tobacco blend (TB), the tobacco- substitute sheet material (TSS) and the tobacco blend treatment (BT) reduce the generation of constituents at source within the burning cigarette.
- the two filter technologies an amine functionalised resin material (CR20L) and a high activity, polymer-derived, carbon adsorbent (HAC), remove volatile species from the smoke stream after formation. These technologies are discussed m greater detail below (m Section 2.1).
- TSNAs smoke constituents
- metals such as tyrene-maleic anhydride copolymer
- levels of TSNAs may be reduced by using specific (such as lighter) tobacco blends and by selecting parts of the tobacco plant that are low m nitrate, a precursor of TSNAs.
- specific tobacco blends such as lighter
- parts of the tobacco plant that are low m nitrate, a precursor of TSNAs.
- the person skilled in the art would be well aware of the ways in which the blending process may be adapted to provide a tobacco blend having these desired properties.
- the tobacco blend may also comprise expanded tobacco, which is cut tobacco that has been expanded to reduce the mass of tobacco burnt m a cigarette.
- expanded tobacco is cut tobacco that has been expanded to reduce the mass of tobacco burnt m a cigarette.
- the expansion processes are similar to those used to make puffed rice snack food.
- One process used is called dry-ice expanded tobacco (DIET) and involves permeating the tobacco leaf structure with liquid carbon dioxide before warming. The resulting carbon dioxide gas forces the tobacco to expand.
- DIET dry-ice expanded tobacco
- Some of the commercially available tobacco brands with low ISO tar yields use some proportion of expanded tobacco in the overall blend.
- Treated tobacco blends are described herein which have been treated by processes that allow the removal of protein and polyphenols from tobacco, with a beneficial effect on the smoke toxicant yields.
- the tobacco treatment was carried out on cut, flue-cured tobacco, and involved extraction of the tobacco with water followed by treatment with an aqueous protease enzyme solution. After treatment of the tobacco extract with adsorbents and concentration, the solubles were re-applied to the extracted tobacco.
- the treated tobacco retained the structure of the original tobacco and was made into cigarettes using conventional cigarette malting equipment, without the need for reconstitution into a sheet material.
- Another approach to reducing smoke toxicant yields is to dilute the smoke with glycerol and it is proposed to include up to 60% of a glycerol-containing "tobacco substitute" sheet in cigarettes. Analysis of mainstream smoke from such
- CR20 Diaion®CR20
- the amine-functionalised chelating resin material may be incorporated into the filter of a smoking article in a cavity, or dispersed (dalmation style) throughout the filter material (such as cellulose acetate) in the whole or a section of the filter.
- a high activity material comprising spherical particles of polymer-derived carbon was prepared by a propriety process (Von Bhicher and De Ruiter 2004; Von Blucher et el 2006; Bohringer and Fichtner 2008) and was available from Blucher GmbH (Germany).
- the polymer-derived material is approximately twice as effective, in general, at removing volatile cigarette smoke toxicants than the coconut shell- derived carbon commonly used in contemporary carbon filtered cigarette products.
- the polymer-derived carbon performed well at both ISO and HCI smoking regimes and with regular and smaller circumference cigarettes. Limitations were also obseived under higher flow-rate smoking conditions m the removal of acetaldehyde.
- the high activity carbon may be incorporated into the filter of a smoking article m a cavity, or dispersed (dalmation style) throughout the filter material (such as cellulose acetate) m the whole or a section of the filter.
- the present invention provides ECs made using combinations of the blend and filter technologies described.
- the goal of the study of these ECs was to assess whether these technologies could be combined into prototypes which reduce machine yields of toxicants in comparison to commercial products, and have the potential to reduce exposure of smokers to toxicants m human smoking.
- the ECs were constructed from combinations of blend and filter technologies that were developed to reduce specific chemical classes of smoke toxicants or their precursors m tobacco (Table 1). For each EC individual tobacco grades with low TSNA and metal contents were selected and blended to provide a low toxicant starting point for the design of experimental cigarettes.
- the tobacco blend is subjected to an aqueous extraction step and the extract is subsequently passed through two stages of filtration to remove polyphenols and soluble peptides.
- the residual tobacco solids are treated with protease to remove insoluble proteins.
- the tobacco sohds and filtered aqueous extract are re-combined.
- the treatment process lesults in reduced smoke yields of plienolics, aromatic amines, HCN, and a number of other nittogenous smoke constituents; however, there are also increases m the yields of formaldehyde and isoprene.
- the tobacco material to be extracted may be strip, cut, shredded or ground tobacco.
- the tobacco is shredded tobacco.
- Other forms of tobacco may, however, be extracted using the methods described herein.
- the tobacco material may be mixed with a solvent for extraction to form a slurry.
- the solvent may be added to the tobacco material in a ratio of between 10:1 and 50:1, preferably between 20:1 and 40:1 and most preferably between 25:1 and 30:1 by weight. In a particularly preferred embodiment, the solvent is added to the tobacco material in a ratio of 27:1 by weight.
- the solvent may be an organic solution, but preferably is an aqueous solution or is water.
- the solvent is usually water, but it can also contain alcohols such as ethanol or methanol, or it can contain a surfactant.
- Other solvents could be used, depending on the particular constituents to be extracted from the tobacco.
- the extraction may be performed at 15-85°C, and preferably is performed at 65°C. It is preferable for the slurry to be continually stirred during extraction, such that the tobacco remains m suspension. Extraction should be performed for between 15 minutes and two hours. In a preferred embodiment, extraction is performed for approximately 20 minutes.
- soluble tobacco components are removed from the tobacco material and enter solution. These include nicotine, sugars, some proteins, ammo acids, pectins, polyphenols and flavours. Up to about 55% of the initial tobacco weight may become solubilised. It is important that the pectins m the tobacco fibre remain cross-linked throughout the extraction and treatment process m order to maintain the fibrous structure of the tobacco. Accordingly, calcium may be added to the solvent used to extract the tobacco and to any solutions used m the downstream processing procedures. Following extraction, the slurry may be drained to allow the liquid filtrate (the "mother filtrate") to be collected. Meanwhile, the insoluble tobacco residue may be further extracted by counter-current washing as it is conveyed, so that as many soluble constituents as possible are removed from the tobacco.
- mother filtrate the liquid filtrate
- Fresh solvent may be applied to the tobacco and the filtiate (the "wash filtrate") is collected.
- the wash filtrate may be recycled by being applied to the incoming tobacco residue travelling on the belt at an upstream point.
- the collection and upstream reapplication of wash filtrate to incoming tobacco residue may be repeated a number of times, preferably three, four or even five times.
- the final wash filtrate that is collected at the head of the belt may be concentrated in those soluble tobacco constituents that have been removed from the tobacco residue as it travels the length of the filter.
- the final wash filtrate may be further recycled by being added to fresh tobacco to form a tobacco slurry, ready for extraction. For example, the final wash filtrate may be added into the tobacco mix tank where a tobacco slurry is formed prior to extraction.
- the extraction process may thus be a continual process in which fresh tobacco is extracted using recycled wash filtrate. Only at start-up of this extraction process is tobacco extracted with fresh solvent. Once the extraction process has begun, no fresh solvent is used m the extraction, but the solvent is solely made up of recycled wash filtrate.
- the extract thus becomes more concentrated in soluble tobacco constituents.
- These constituents include those that entered solution during primary extraction m the extraction tank (forming the mother filtrate), as well as those that entered solution during secondary extraction on the horizontal belt filter (forming the wash filtrate).
- the final filtrate thus comprises both the mother and wash filtrates.
- the tobacco residue that results after filtration is devoid of those constituents that are soluble in the solvent used for extraction.
- the extracted tobacco may be squeezed at the end of filtration, so as to remove any excess liquid from it.
- the extracted tobacco emanating from the horizontal belt filter is thus typically m the form of a dewatered mat.
- the final filtrate hereinafter referred to as the tobacco extract, may be subsequently processed to remove those constituents not desired in the final tobacco product.
- Undesirable constituents include proteins, polypeptides, amino acids, polyphenols, nitrates, amines, nitrosamines and pigment compounds.
- the levels of constituents which may be considered desirable, such as sugar and nicotine, may, however, remain unaffected so that the flavour and smoking properties of the extracted tobacco are comparable to those of the original material.
- the tobacco extract is treated to remove proteins, polypeptides and/or amino acids.
- Up to 60% of the proteins contained in the original tobacco material may be removed using an insoluble adsorbent such as hydroxyapatite or a Fuller's Earth mineral such as attapulgite or bentonite.
- the tobacco extract is preferably treated with bentonite, to remove polypeptides therefrom. Bentonite may be added to the extract in an amount of 2-4% of the weight of tobacco initially extracted.
- the tobacco extract may be fed into a tank containing a slurry of bentonite in water.
- a suitable slurry contains approximately 7 kg of bentonite in approximately 64 kg water (quantities per hour), for example, 7.13 kg bentonite m 64.18 kg water (quantities per hour).
- the bentonite concentration should be high enough to substantially reduce the protein content of the tobacco extract, but not so high as to additionally adsorb nicotine from it.
- Bentonite treatment may also be effective in the removal of pigment compounds found m tobacco extract which, if not removed, tend to darken the extract after concentration. When sufficient bentonite is used to treat the extract, the reduced amount of pigment compounds may result in a product that is not overly darkened m appearance.
- the tobacco extract may be purified from the slurry by centrifugation and/ or filtration. The tobacco extract may also, or alternatively, be treated to remove polyphenols therefrom.
- PVPP Polyvinylpolypyrrolidone
- PVPP Polyvinylpolypyrrolidone
- PVPP is an insoluble adsorbent for polyphenols, traditionally used m the brewing industry to remove polyphenols from beer.
- PVPP in an amount of 5-10% of the weight of tobacco initially extracted may be added to the extract. This amount of PVPP is capable of removing between 50 and 90% of the polyphenols in solution.
- the optimum pH for removal of polyphenols from the tobacco extract by PVPP is believed to be about 3.
- the efficiency of adsorption by PVPP may therefore be increased by reducing the pH of the extract via the addition of a suitable acid, such as hydrochloric acid.
- one or more enzymes may be added to the tobacco extract to degrade the polyphenols therein.
- a suitable enzyme is laccase (urishiol oxidase).
- laccase urishiol oxidase
- the invention is not, however, hmited to methods for removing only proteins and/or polyphenols from tobacco.
- Alternative or additional enzymes, agents or adsorbents may be used to remove other undesirable tobacco constituents from the tobacco extract. Examples of further undesirable tobacco constituents that could be removed from the extract include nitrates, amines and nitrosamines.
- a number of tanks may be set up m series, each one comprising a different enzyme, agent or adsorbent, m order for a chosen complement of undesirable constituents to be removed.
- a single tank may contain a plurality of enzymes, agents or adsorbents so that the undesirable constituents may be removed in a single step.
- a bentonite or PVPP holding tank could comprise one or more additional enzymes, agents or adsorbents so as to remove not only protein or phenols from the tobacco, but one or more further undesirable constituents also.
- the extract is preferably concentrated to a solids concentration of between 20 and 50% by weight. Concentrations of up to 10% solids are most efficiently achieved using reverse osmosis. A further concentration to
- the concentrated tobacco extract may be subsequently recombined with the extracted tobacco.
- the tobacco having been extracted in an aqueous solution as discussed above, however, is preferably further extracted to remove one or more further undesirable constituents before being recombined with the concentrated tobacco extract. Further extraction of the tobacco may be performed using an enzyme specifically selected for removal of the constituent of choice.
- the enzyme is a proteolytic enzyme for removal of protein from the tobacco.
- the enzyme is preferably a bacterial or fungal enzyme and, more preferably, is an enzyme used commercially in the food and detergent industries.
- the enzyme may be selected from the gioup consisting of SavinaseTM, NeutraseTM, EnzobakeTM and AlcalaseTM, which are all available from Novozymes A/S.
- the proteolytic enzyme is preferably added to the tobacco in an amount of between 0.1 and 5% by weight of the tobacco material.
- SavinaseTM may be added to the tobacco m an amount of approximately 1% by weight.
- the tobacco may be reslurried in a solution of the chosen enzyme.
- the ratio of water to tobacco in the slurry should be between 10:1 and 50:1, preferably between 20:1 and 40:1 and most preferably between 25:1 and 30:1 by weight. In a particularly preferred embodiment, the ratio of water to tobacco is 27:1 by weight.
- the pH of the tobacco/ enzyme mixture should be that which promotes optimal enzyme activity.
- the pH-adjusted tobacco may then be fed into an enzyme dosing tank for mixing with the enzyme of choice.
- the tobacco/ enzyme mixture may subsequently be fed into a plug flow reactor, where the enzymic extraction is performed.
- the enzymic extraction should be carried out at the temperature promoting optimal enzyme activity. Preferably, a narrow temperature range, such as 30-40°C, should be used to avoid denaturing the enzyme.
- the optimum working conditions when SavinaseTM is the chosen enzyme are 57 °C and pH 9-11.
- the enzymic extraction should be carried out for at least 45 minutes; any shorter duration is believed to be insufficient for a proteolytic enzyme to degrade tobacco proteins.
- multiple enzymic extractions could be carried out if there are multiple constituents to be removed from the tobacco. These could be performed in series or multiple enzymes could be added to the tobacco m a single treatment step. It also remains possible for the enzyme to be included in the very first extraction step in the treatment process, rather than forming a subsequent separate extraction step.
- the insoluble tobacco residue may be washed with a salt solution, preferably a sodium chloride solution, to rinse it free of enzyme. Salt rinsing may be performed in a sequential, counter-current fashion.
- a salt solution preferably a sodium chloride solution
- Salt and water rinsing may not be sufficient to remove all of the enzyme from the tobacco.
- the washed tobacco may also be treated to deactivate any residual enzyme remaining in the tobacco following the salt and water rinses. This may be done by steam treating the tobacco sufficiently to deactivate the enzyme, but not so much that the tobacco loses its fibrous form. In an embodiment, steam treating is carried out at 98°C for four minutes, but the residence time may be increased to 10 minutes or so if desired.
- the tobacco may be heat treated to deactivate the enzyme, for example by microwavmg or baking the tobacco.
- the enzyme may be deactivated by chemical denaturation; steps should however be taken to remove the chemical from the tobacco.
- the processed tobacco may then be recombmed with the concentrated tobacco extract. Adding the treated extract back to the extracted tobacco ensures retention of water soluble flavour components of tobacco and nicotine in the final product. Recombination therefore results m a tobacco product that has similar physical form and appearance, taste and smoking pioperties to the original material, but with substantially reduced levels of protein, polyphenols or other constituent(s) of choice. Recombination may be achieved by spraying the tobacco extract onto the tobacco. The amount of the original extract being recombined with the processed tobacco depends upon the amount that was lost during treatment of the extract to remove selected constituents, and will vary from one type of tobacco to the next.
- a standard diying process may be used to dry the treated tobacco, either before, during or after recombination with the treated tobacco extiact.
- the starting moisture content of the treated tobacco is typically approximately 70-80%. In a preferred embodiment, the moisture content after drying should be approximately 14%.
- a heated dryer such as an apron dryer, may be used to reduce the starting moisture content in the tobacco to approximately 30%.
- a second heated dryer, such as an air dryer, may then be used to further reduce the moisture content to approximately 14%.
- the final dried product may subsequently be processed into a finished form, such as a sheet, which, when shredded, can form all or part of a cigarette filler.
- a finished form such as a sheet
- the concentration of remaining constituents per unit weight of tobacco is increased in the finished product compared to the original material.
- These constituents include cellulose, which, together with sugars and starches, may produce harmful volatile materials such as acetaldehyde and formaldehyde in smoke when combusted.
- TSS tobacco substitute sheet
- NFDPM nicotme-free dry particulate matter
- a smoking article may be prepared including a tobacco substitute sheet material comprising a non-combustible inorganic filler material, an alginic binder and aerosol generating means.
- the tobacco substitute sheet material comprises as the main components thereof, non-combustible inorganic filler, binder and aerosol generating means, with these three components together preferably comprising at least 85% by weight of the tobacco substitute sheet material, preferably greater than 90%, and even more preferably total about 94% or more by weight of the tobacco substitute sheet material.
- the three components may even be 100% of the tobacco substitute sheet material.
- the remaining components are preferably one or more of colourant, fibre, such as wood pulp, or flavourant, for example. Other minor component materials will be known to the skilled man.
- the tobacco substitute sheet material is therefore a very simple sheet in terms of its constituents.
- the term ' tobacco substitute sheet material' means a material which can be used in a smoking article. It does not necessarily mean that the material itself will necessarily sustain combustion.
- the tobacco substitute sheet material is usually produced as a sheet, then cut.
- the tobacco substitute sheet material may then be blended with other materials to produce a smokeable filler material.
- the present invention further provides a smoking article comprising a wrapped rod of a smokeable filler material, the smokeable filler material consisting of a blend which incorporates tobacco substitute sheet mateiial comprising a non-combustible inorganic filler, an alginic binder and aerosol generating means, the smoking article having an aerosol transfer efficiency ratio of greater than 4.0.
- the aerosol tiansfer efficiency is measured as the percentage aerosol m the smoke divided by the percentage aerosol in the smokeable filler material.
- the aerosol tiansfer efficiency is greater than 5, and more preferably greater than 6.
- the smokeable filler material used in the smoking articles of the present invention may comprise a blend consisting of not more than 75% by weight of the tobacco substitute sheet material.
- the inorganic filler material is present in the range of 60-90%, and is more preferably greater than 70% of the final sheet material.
- the inorganic filler material is present at about 74% by weight of the final sheet material, but may be present at higher levels, for example, 80%, 85% or 90% by weight of the final sheet material.
- the non-combustible filler advantageously comprises a proportion of material having a mean particle size m the range of 500 ⁇ to 75 ⁇ .
- the mean particle size of the inorganic filler is in the range of 400 ⁇ to ⁇ , and is more than 125 ⁇ , and preferably more than 150 ⁇ .
- the mean particle size is at or about 170 ⁇ , and may be in the range of 170 ⁇ to 200 ⁇ . This particle size is in contrast to that conventionally used for food grade inorganic filler materials m alternative tobacco products, namely a particle size of about 2-3 ⁇ .
- the lange of particle size seen for each inorganic filler individually may be from ⁇ -lmm ( ⁇ ).
- the inorganic filler material may be ground, milled or precipitated to the desired particle size.
- the inorganic filler material is one or more of perlite, alumina, diatomaceous earth, calcium carbonate (chalk), vermicuhte, magnesium oxide, magnesium sulphate, zinc oxide, calcium sulphate (gypsum), ferric oxide, pumice, titanium dioxide, calcium aluminate or other insoluble aluminates, or other inorganic filler materials.
- the density range of the materials is suitably m the range of 0.1 to 5.7 g/cm 3 .
- the inorganic filler material has a density that is less than 3 g/cm 3 , and preferably less than 2.5 g/cm 3 , more preferably less than 2.0 g/cm 3 and even more preferably less than 1.5 g/cm 3 .
- An inorganic filler having a density of less than 1 g/cm 3 is desirable.
- a lower density inorganic filler reduces the density of the product, thus improving the ash characteristics.
- one or more of the fillers may suitably be of a small particle size and another may be of a larger particle size, the proportions of each filler being suitable to achieve the desired mean particle size.
- the static burn rate required m the finished smoking article may be achieved using an appropriate blend of tobacco and tobacco substitute sheet material m the smokeable filler material.
- the inorganic filler material is not m agglomerated form.
- the inorganic filler material should require little pre-treatment, other than perhaps size gradation, before use.
- the binder is present in the range of about 5-13%, more preferably less than 10% and even more preferably less than 8%, by weight of the final filler material.
- the binder is about 7.5% by weight or less of the final sheet material.
- the binder is a mixture of alginate and non-algmate binders, then preferably the binder is comprised of at least 50% alginate, preferably at least 60% alginate and even more preferably at least 70% alginate.
- the amount of combined binder requited may suitably decrease when a non-alginate binder is utilised.
- the amount of alginate in a binder combination advantageously increases as the amount of combined binder decreases.
- Suitable algmic binders include soluble alginates, such as ammonium alginate, sodium alginate, sodium calcium alginate, calcium ammonium alginate, potassium alginate, magnesium alginate, triethanol-amine alginate and propylene glycol alginate.
- Other organic binders such as cellulosic binders, gums or gels can also be used m combination with algmic binders.
- Suitable cellulosic binders include cellulose and cellulose derivatives, such as sodium carboxymethylcellulose, methyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose or cellulose ethers.
- Suitable gums include gum arable, gum ghatti, gum tragacanth, Karaya, locust bean, acacia, guar, quince seed or xanthan gums.
- Suitable gels include agar, agarose, canageenans, furoidan and furcellaran. Starches can also be used as organic binders.
- Other suitable gums can be selected by reference to handbooks, such as Industrial Gums, E. Whistler (Academic Press). Much preferred as the major proportion of the binder- are alginic binders. Alginates are preferred in the invention for their neutral taste character upon combustion.
- the aerosol generating means is present m the range of 5-20%, more preferably is less than 15%, is even more preferably greater than 7% and even more preferably is greater than 10%.
- the aerosol generating means is less than 13%.
- the aerosol generating means is between 11% and 13%, and may advantageously be about 11.25% or 12.5%, by weight of the final sheet material.
- the amount of aerosol generating means is selected in
- the blend comprising the smokeable fillet material of a smoking article.
- the sheet material may require a lower loading level of aerosol generating means therein.
- the sheet material may require a higher loading level of aerosol generating means therein.
- Suitable aerosol generating means include aerosol forming means selected from polyhydric alcohols, such as glycerol, propylene glycol and tnethylene glycol; esters, such as triethyl citrate or triacetin, high boihng point hydrocarbons, or non-polyols, such as glycols, sorbitol or lactic acid, foi example.
- aerosol generating means selected from polyhydric alcohols, such as glycerol, propylene glycol and tnethylene glycol; esters, such as triethyl citrate or triacetin, high boihng point hydrocarbons, or non-polyols, such as glycols, sorbitol or lactic acid, foi example.
- a combination of aerosol generating means may be used.
- An additional function of the aerosol generating means is the plasticismg of the sheet material.
- Suitable additional plasticisers include water.
- the sheet material may suitably be aerated.
- the cast slurry thereby forms a sheet material with a cellular structure.
- the or a proportion of the aerosol generating means may be encapsulated, preferably micro-encapsulated, or stabihsed in some other way. In such cases the amount of aerosol generating means may be higher than the range given.
- the smoking material comprises a colourant to darken the material and/ or a flavourant to impart a particular flavour. Suitable flavouring or colourant materials, subject to local regulations, can include cocoa, liquorice, caramel, chocolate or toffee, for example. Finely ground, granulated or homogenised tobacco may also be used. Industry approved food colorants may also be used, such as El 50a (caramel), El 51 (brilliant black BN), El 53 (vegetable carbon) or El 55
- flavourants include menthol and vanillin, for example.
- Other casing materials may also be suitable.
- vermicuhte or other inorganic filler materials may give a darker colour to the tobacco substitute sheet material.
- the colourant is present from 0-10% and may be as much as 5-7% by weight of the final tobacco substitute sheet material.
- the colourant is less than 7%, preferably less than 6% and more preferably less than 5% of the final tobacco substitute sheet material. Much preferred is use of colourant at less than 4%, less than 3% and less than 2%.
- Cocoa may suitably be present in a range of 0-5% and liquorice may be present m a range of 0-4%, by weight of the final tobacco substitute sheet material.
- the colourant is cocoa or liquorice
- the minimum amount of cocoa to obtain the desired sheet colour is about 3% and for liquorice is about 2%, by weight of the final tobacco substitute sheet material.
- caramel may suitably be present m a range of 0-5%, preferably less than about 2% by weight of the final tobacco substitute sheet material, and more preferably about 1.5%.
- Other suitable colorants include molasses, malt extract, coffee extract, tea resinoids, St. John's Bread, prune extract oi tobacco extract. Mixtures of colorants may also be used.
- flavourants may also be added to alter the taste and flavour characteristics of the tobacco substitute sheet material.
- a food dye is utilised in the alternative it is present at 0.5% by weight or less of the final tobacco substitute sheet material.
- the colourant may alternatively be dusted into the sheet after sheet manufacture.
- Fibres such as cellulose fibres, for example wood pulp, flax, hemp or bast could be added to provide the sheet material with one or more of a higher strength, lower density or higher fill value. Fibres, if added, may be present m the range of 0.5-10%, preferably less than 5% and even more preferably less than about 3% by weight of the final sheet material. Advantageously there is no fibrous material present in the sheet material, cellulosic or otherwise.
- the tobacco substitute sheet material is a non-tobacco containing sheet. It shall be understood that at high levels of sheet material inclusion in the blend, e.g. at greater than 75% by weight of the blend, the combustibility of the blend is poor. This may be overcome by, for example, incorporating low levels of up to 5-10% granular carbon m the tobacco substitute sheet material.
- the carbon is prefeiably not an agglomerated carbonaceous material, i.e. the carbon is not pre- treated by mixing with another material to produce an agglomerate.
- the tobacco substitute sheet material is blended with tobacco material to provide smokeable filler material.
- the tobacco material components in the blend are high quality lamina grades.
- the majority of the tobacco material is cut tobacco.
- the tobacco material may comprise between 20- 100% expanded tobacco of a high order expansion process, such as DIET for example.
- the filling power of such material is typically in the range of 6- 9cc/g (see GB 1484536 or US 4,340, 073 for example).
- the blend comprises ⁇ 30% of other blend components apart from lamina, the other blend components being stem cut rolled stem (CRS), water treated stem (WTS) or steam treated stem (STS) or reconstituted tobacco.
- the other components comprise ⁇ 20%, more preferably ⁇ 10% and even more preferably ⁇ 5% of the final weight of the tobacco material.
- a smoking article according to the invention comprises tobacco material being treated with aerosol generating means.
- the tobacco material may be treated with aerosol generating means, but this is not essential for all blends of tobacco material and sheet material.
- the amount of aerosol generating means added to the tobacco is m the range of 2- 6% by weight of the tobacco.
- the total amount of aerosol generating means m the blend of tobacco material and sheet material after processing is advantageously in the range of 4-12% by weight of the smokeable material, preferably less than 10% and preferably more than 5%.
- the polymer-derived, high activity carbon granules used in the dual and triple stage filters possesses a pore structure different from the carbon commonly used in commercial cigarettes, which is typically derived from coconut shells. As a result it has superior adsorption characteristics for a range of volatile smoke toxicants.
- the spherical particle shape polymer-derived carbon was prepared by a propriety process (Von Blucher and De Ruiter 2004, Von Blucher et el 2006, Bohrmger and Fichtner 2008), as depicted in Figure 14.
- the polymer-derived active carbon is produced using a batch process with indirect heated rotary kilns, under reduced pressure in an melt atmosphere.
- the material After preparation of the spherical polymer feed- stock the material is thermally stabilised using an excess of oleum. Subsequently, the mateml is slowly heated to 500°C, resulting in the release of predominantly S0 2 and H 2 0 and the carbonisation of the polymer. The resulting carbon has an initial pore system which is not accessible for typical adsorptives. To create a porous system capable for adsorption, the material is further heated to 900 to 1000°C for activation with oxidising agents (steam). This establishes a pole system consisting mainly of micropores with pore sizes between 0.7 and 3 nm.
- the polymer-derived carbon being a synthetic material, possesses a much more closely defined spherical shape, together with a more uniform particle size.
- the polymer derived material possesses a lower density, and has a lower ash content reflecting the synthetic nature of the polymer feedstock in comparison to a natural coconut shell as starting materials for the carbonization processes.
- DIAION® CR20 is a commercially available type of amme-functionalised resin bead which may be used m the present invention (manufactured by Mitsubishi Chemical Corporation). It has polyamine groups as chelating ligands which are bonded onto a highly porous crosslmked polystyrene matrix. CR20 shows large affinity for transition metal ions. The exact type of amine gioups produced by functionahzation cannot be precisely controlled and several different types could be present on the resins. Commercial grade CR20 (hereafter referred to as CR20C) was found to have a characteristic odour incompatible with conventional consumer acceptable cigarette smoke character when incorporated into cigarettes.
- CR20 Various other types of CR20 are made by Mitsubishi Chemical Corporation, including CR20D and CR20HD. All of the different types or grades of the ion- exchange resin are encompassed by the term CR20 as used herein.
- Some CR20 beads are provided m water and, to make them suitable for use in a cigarette filter application, it may be necessary to remove at least some of the water. In one embodiment, the water is removed and the material is dried to approximately 15% or less moisture. In an alternative embodiment, a higher moisture content may be acceptable m the filter of smoking articles.
- CR20 including specifically CR20L, may be incorporated into cigarette filters.
- CR20L offers superior reductions for HCN, formaldehyde and acetaldehyde.
- carbon is more efficient than CR20L in removing other volatile constituents from a smoke stream.
- Cigarettes were constructed using these technologies targeting ISO NFDPM (tar) yields of 1 and 6mg.
- the commercial comparator products were of similar machine smoked constituent yields to the market leading brands at 1 mg and 6 mg (ISO) from Germany in 2007- 8.
- BAT group comparator cigarettes were chosen, rather than the actual market leading brands, m order that full information was available on blend and cigarette design characteristics, and to allow product masking to be conducted for human sensory and exposure evaluations. Samples of both commercial cigarettes were therefore manufactured specially for these studies, without brand marking or other identification, in order to support human smoking studies.
- the experimental cigarette BT1 combined a Virginia style tobacco blend containing BT treated tobacco (75.4% treated Virginia tobacco, with 4.3% Oriental tobacco and 20.3% untreated Virginia tobacco) with a filter containing a CR20 stage (to reduce formaldehyde, acetaldehyde and HCN yields) and a polymer-derived, high activity carbon filter containing stage (to reduce yields of isoprene and other volatile toxicants).
- the target NFDPM yield from this cigarette was 1 mg under ISO machine smoking conditions.
- the experimental cigarette TSS1 was also designed to yield 1 mg of NFDPM under ISO smoking machine conditions and was based on an US style blend containing TSS (a blend of Viiginia, Burley and Oriental tobaccos, with the inclusion of approximately 20% TSS and the same filter used in
- the experimental cigarette BTl also used 20%TSS in a different US style blend, and was designed to give an NFDPM yield of 6 mg under ISO machine smoking conditions.
- a different filter construction was used with this cigarette: a dual segment filter containing 80 mg of the high activity carbon interspersed amongst CA fibres adjacent to the tobacco rod with a CA stage at the mouth end.
- the commercial comparator cigarette CCl contained a US-blended style of tobacco, including some Maryland tobacco.
- the commercial comparator cigarette, CC6 was also a typical US-blended cigarette but with a different blend to CCl.
- the design features of the three ECs are summarised and compared with control cigarettes and commercial comparators in Table 2 [shown m Figure 1]. Both commercial comparator cigarettes used single stage cellulose acetate filters.
- the three "scientific control" (SC) cigarettes had identical construction to the relevant experimental cigarettes BTl, TSSl and TSS6, with the exception that the filter used in each control cigarette was a single stage 27 mm CA filter without additional filter adsorbent media.
- Table 2 shows that the cigaiette constructions of BTl and CCl were very similar, with well matched filter ventilation and paper permeability. There were slight differences in tobacco density and filter pressure drop (the draw resistance or impedence to flow of the filter), with BTl higher than CCl for both parameters. The cigarette constructions of TSSl and CCl were also very similar. The filter pressure drop was higher from TSSl than the commercial control, but both tobacco density and filter pressure drop were higher for CCl. For TSS6 and CC6 less filter ventilation was used than with the lmg (ISO) products. Comparing the two 6 mg (ISO) products showed slightly higher tobacco densities, pressure drop values and shghtly lower filter ventilation for TSS6.
- cigarettes Prior to smoke chemistry analysis, cigarettes were conditioned according to the specifications of ISO 3402, 1999. Routine chemical analyses were performed according to the smoking conditions specified in ISO 4387, 2000 (i.e., a 35 ml puff of 2 seconds duration taken every 60 seconds, abbreviated as 35/2/ 60) and ISO 3308, 2000 which was developed for NFDPM and nicotine analysis.
- Testing of the ECs was conducted m order to examine the actual performance of the ECs from a blend and smoke chemistry perspective, by quantifying the MS constituents and specific toxicant yields under a number of machine smoking conditions.
- the SS emissions from the ECs were also measured using the ISO smoking profile.
- the tests were conducted on a comparative basis with two commercial cigarettes and with three scientific control cigarettes.
- the overall performance of the ECs was assessed both m comparison to previously published MS yield data on cigarettes from several countries and as ratios of specific toxicant yields to nicotine yields.
- the yields of the major smoke constituents (NFDPM, nicotine and CO) and glycerol under four smoking machine conditions are shown in Table 4 (shown in Figure 2). Glycerol measurements are included m this table because it has been incorporated into the tobacco-substitute sheet used in the ECs TSSl and TSS6, to dilute other smoke constituents m the smoke particulate phase.
- Table 4 shows that BTl and CC1 were well matched across the four smoking regimes for MS NFDPM and nicotine yields, but that BTl had lower CO yields than CC1.
- TSSl and CC1 were well matched across the four smoking regimes for NFDPM and nicotine yields but TSSl had lower CO yields than CC1.
- the higher glycerol yield from TSSl is consistent with the intended dilution effect due to the glycerol content of TSS.
- the MS NFDPM and nicotine yields from TSS6 and CC6 were well matched across the four smoking regimes, other than higher CO yields from CC6 and the expected higher glycerol yields from TSS6.
- HCI smoking regime in this work represents the strictest test of the ECs and the commercial comparator cigarettes. Although these smoking conditions inactivate a design feature used m the ECs and commercial cigarettes (filter ventilation), they address criticism of the machine yield values obtained from ventilated cigarettes.
- Blend nitrosamine content of BTl was lower than US-blended commercial comparator CCl, as has been seen previously m comparison of Virginia and US- blended cigarettes.
- the MS yields of nitrogenous constituents were expected to be lower from BTl than from CCl for two reasons: first the tobacco treatment reduces precursors of nitrogenous smoke compounds; and, second, Virginia style tobaccos typically generate lower yields of nitrogenous smoke constituents than US-blended cigarettes. Measurement of the yields of nitrogenous compounds showed the anticipated differences: yields of the TSNAs were statistically significantly (83-96%) lower from BTl than from CCl (Table 6); aromatic amine yields from BTl were 26- 57% lower than from CCl (Table 7); and the yields of other nitrogenous
- the BT process also reduces blend polyphenol levels and so reductions in MS phenols yields would be expected; however, higher yields of phenohcs are generally expected from Virginia style products than from US-blended products and this tobacco type difference could mitigate any reductions from the BT process.
- the volatile hydrocarbon yields from BTl were lower, with a range from 21 to 78% for isoprene, benzene, toluene and naphthalene, when compared to the respective constituent yields from CCl; however, the 1,3-butadiene yield was 35% higher from BTl compared to CCl .
- the 1,3-butadiene yields from CCl are lower than expected under the HCI regime, and this observation may therefore be unreliable. Most of the observed differences in volatile constituent yields are consistent with the use of an effective vapour phase adsorbent m the filter of BTl. Formaldehyde yields are driven m part by sugar levels, which are normally higher in Virginia blends than in US blends.
- Formaldehyde yields are also increased by the blend treatment process. Hence the higher formaldehyde yields from BTl are understandable on the basis of knowledge of formaldehyde generation m cigarettes.
- the apparent higher yield of 1,3-butadiene from BTl is possibly due to an error in the yield measurement of CCl as there is no obvious mechanistic factor to support this difference (the tobacco treatment process does not give statistically significant changes m 1,3-butadiene yields and the use of the vapour phase adsorbent m BTl filters should result in lower 1,3 butadiene yields from BTl).
- the overall blend metal content was higher in TSSl than in CCl for some metals (arsenic, chromium and nickel), lower for cadmium content and not different for other metals (Table 5).
- the TSS contains a high proportion of chalk, which would contribute some portion of the blend metals.
- Analysis of the TSS showed a higher level of chromium and comparable or lower levels of the other measured metals than the TSSl blend.
- the higher chromium content of TSSl than CCl most likely reflects the inclusion of TSS material in the blend; whereas, the higher arsenic and nickel levels were most likely due to the different tobacco types used m the blend.
- the blend metal contents of TSS6 and CC6 were similar, other than statistically significantly higher chromium and cadmium blend levels in TSS6.
- the higher chromium level was most hkely due to the high inorganic content of the TSS; whereas, the higher cadmium content most likely reflects a difference in the tobacco types used between the two blends.
- the MS yields of cadmium and chromium, determined under HCI smoking machine conditions, were not elevated in TSS6 compared to CC6 (Table 6), which again supports the contention that the chemical form of these metals was different between the EC and the commercial comparator, and less likely to transfer into MS.
- the three data sources above were compiled into one dataset to provide a reference set of global cigarette yield data with which to compare the toxicant yields from the ECs described in this study.
- the full dataset was truncated as follows: first, arsenic, methyl ethyl ketone, nickel and selenium yields were removed from the dataset because yields were not provided by all three sources; second, a number of brands were removed from the dataset due to incomplete, duphcated or erroneous data (two brands m the HC dataset appear to have erroneous (exchanged) toluene and styrene yields; tar, nicotine and CO yields were not provided in the HC dataset for Gitanes KS, and multiple instances of the same yield data were observed m the HC dataset).
- the median value was normalised to 100 for each toxicant, and the yields of toxicants scaled against this value of 100. Totalling the scaled values for all toxicants gave a normalised toxicant total (NTT) for each brand.
- NTT normalised toxicant total
- the TTY, TSY and NTT values for the ECs are compared to and ranked against the values for all of the brands m the commercial dataset m Figures 10 to 12. The comparisons show, with each of the approaches, that the ECs were at the low end of the ranking order.
- the lmg ECs were found to have the lowest total toxicant yields under each of the three approaches, and the 6mg EC was also lower than any of the commercial brands for the TSY and NTT.
- TTY analysis two of the 120 commercial products have lower TTY values than TSS6 due to their lower tar and nicotine values.
- the commercial comparator cigarettes CC1 and CC6 were also reasonably low in total toxicant values in comparison with the dataset of commercial brands, falling around the lower quartile of values.
- SS yields for the expanded list of smoke constituents were measured, under ISO smoking parameters.
- the ISO smoking parameters were chosen because they generate higher SS yields than any of the other smoking regimes.
- the quantity of sidestream smoke can be expected to be dependent on the amount of tobacco consumed in the static burn or smoulder phase of cigarette smoking.
- the SS yield results are presented as a comparison between the ECs BTl and TSS1 and the commercial cigarette CC1, in Table 10.
- the cigarettes are of king size format with a filter length of 27mm and a tobacco rod of 56mm.
- the prototypes have a tobacco rod comprising a mix of lamina, Expanded Tobacco and non tobacco sheet or modified tobacco.
- Conventional cigarette paper is used to form the tobacco rod and ensure the achievement of burn rate and subsequent puff number.
- the filter for two of the prototypes is a triple filter composed of a CA mouth end segment (7 mm m length), a CA central segment containing CR20 HD ion exchange resin (10 mm in length) and a dalmation style tobacco end segment containing carbon beads with an engineered microstructure (10 mm m length).
- the filter for the third prototype is a dual filter composed of a CA mouth end segment (15mm in length) and a dalmation style tobacco end segment containing high activity, polymer-derived carbon beads (12 mm in length).
- the prototype cigarettes were manufactured to give ISO NFDPM yields of 1 (T562 and H671) and 6 mg (F752). The specification of the prototype cigarettes is described m more detail m Tables 11 to 13.
- the non tobacco sheet is TSS with the following specification: Chalk (78.5%), Kelvis Alginate (7.5%), Glycerol (12.5%) and Caramel colourant (1.5%)
- a CR20 HD amine functionalised resin (manufacturer: Mitsubishi)
- b Blucher carbon spherical carbon beads (manufacturer: Adsor Tech.)
- Figure 17 shows the biomarker results for Group 2 who switched from control cigarette CC6 (Day 14) to test cigarette TSS6 (Day 41). * denotes a statistically significant difference (p ⁇ 0.01) between day 14 and 41 results. Non-smoker biomarker levels are shown for reference. All non-smoker levels were significantly lower than day 14 values
- Figure 18 shows the biomarker results for Group 4, who switched from control cigarette CC1 (Day 14) to test cigarette TSS1 (Day 41) and Group 5, who switched from control cigarette CC1 (Day 14) to test cigarette BT1 (Day 41).
- FIG. 1 shows a smoking article design according to an embodiment of the present invention.
- the smoking article 1 comprises a tobacco rod 2 and a filter 3.
- the tobacco rod comprises a rod of smokeable material, the composition of which is 75% blend treated tobacco, 12.5% leaf and 12.5% expanded tobacco.
- the blend treated tobacco is a tobacco with reduced protein and polyphenol content which results from the following process: (l) aqueous extiaction of a tobacco; (u) passing the aqueous extract through a clay and a resin; (iii) treatment of the fibre with an enzyme and deactivation; and (iv) recombming the extract and fibre and drying.
- the leaf is tobacco as is used in conventional commercial cigaiettes.
- the expanded tobacco is a tobacco that has been expanded using a supeicritical C0 2 process which is used in conventional commercial cigarettes.
- the filter 3 is attached to the tobacco rod 2 by a tipping paper which is a non- porous paper.
- the filter 3 is made up of three sections, as indicated by the inset.
- the section 4 adjacent the end of the tobacco rod is 10 mm in length and contains 60 mg of synthetic carbon. This is a form of carbon which has an engineered porous structure.
- the middle section 5 is 10 mm in length and contains 20 mg (that is, 2 mg/mm) of CR20HD, an amine functionalized resin having a water content of 12- 17%.
- the mouth-end section 6 of the filter is 7 mm in length. This may comprise, for example, cellulose acetate tow as used m conventional commercial cigarettes.
- the smokeable material may further include tobacco substitute sheet.
- Tobacco substitute sheet is a chalk-based sheet containing glycerol that reduces the quantity of tobacco in a cigarette when incorporated into the tobacco blend.
- the tobacco substitute sheet may replace some or all of any or all of the different materials making up the smokeable material of the smoking article design discussed above.
- CR20D is an amine functionalized resin having a water content of 0-5%.
- CR20D may partially or completely replace the CR20HD used in the design discussed above.
Abstract
Description
Claims
Priority Applications (11)
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KR1020137024355A KR20140004754A (en) | 2011-02-17 | 2012-02-16 | Smoking articles |
US13/985,869 US20140020699A1 (en) | 2011-02-17 | 2012-02-16 | Smoking articles |
AU2012219223A AU2012219223B2 (en) | 2011-02-17 | 2012-02-16 | Smoking articles |
CN2012800092089A CN103347408A (en) | 2011-02-17 | 2012-02-16 | Smoking articles |
EP12710532.8A EP2675302A1 (en) | 2011-02-17 | 2012-02-16 | Smoking articles |
JP2013554008A JP2014506470A (en) | 2011-02-17 | 2012-02-16 | Smoking goods |
BR112013020509A BR112013020509A2 (en) | 2011-02-17 | 2012-02-16 | smoking article |
RU2013142175/12A RU2013142175A (en) | 2011-02-17 | 2012-02-16 | SMOKING PRODUCTS |
NZ612998A NZ612998B2 (en) | 2011-02-17 | 2012-02-16 | Smoking articles |
MX2013009504A MX2013009504A (en) | 2011-02-17 | 2012-02-16 | Smoking articles. |
CA2824731A CA2824731C (en) | 2011-02-17 | 2012-02-16 | Smoking articles |
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GBGB1102785.1A GB201102785D0 (en) | 2011-02-17 | 2011-02-17 | Smoking articles |
GB1102785.1 | 2011-02-17 | ||
GBGB1113614.0A GB201113614D0 (en) | 2011-08-08 | 2011-08-08 | Smoking articles |
GB1113614.0 | 2011-08-08 |
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EP (1) | EP2675302A1 (en) |
JP (2) | JP2014506470A (en) |
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CN (1) | CN103347408A (en) |
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AU (1) | AU2012219223B2 (en) |
BR (1) | BR112013020509A2 (en) |
CA (1) | CA2824731C (en) |
CL (1) | CL2013002357A1 (en) |
MX (1) | MX2013009504A (en) |
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WO2014080229A1 (en) * | 2012-11-26 | 2014-05-30 | British American Tobacco (Investments) Limited | Treatment of tobacco material |
RU2521817C1 (en) * | 2013-05-13 | 2014-07-10 | Олег Иванович Квасенков | Method of production of flavoured tobacco blend |
RU2522077C1 (en) * | 2013-05-13 | 2014-07-10 | Олег Иванович Квасенков | Method of production of flavoured tobacco blend |
RU2522087C1 (en) * | 2013-05-13 | 2014-07-10 | Олег Иванович Квасенков | Method of production of flavoured tobacco blend |
RU2521801C1 (en) * | 2013-05-13 | 2014-07-10 | Олег Иванович Квасенков | Method of production of flavoured sweetened tobacco blend |
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Also Published As
Publication number | Publication date |
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AU2012219223A1 (en) | 2013-08-01 |
CA2824731A1 (en) | 2012-08-23 |
BR112013020509A2 (en) | 2016-10-18 |
AR085295A1 (en) | 2013-09-18 |
AU2012219223B2 (en) | 2015-07-23 |
RU2013142175A (en) | 2015-03-27 |
EP2675302A1 (en) | 2013-12-25 |
JP3201449U (en) | 2015-12-10 |
CN103347408A (en) | 2013-10-09 |
NZ612998A (en) | 2015-03-27 |
TW201247115A (en) | 2012-12-01 |
CL2013002357A1 (en) | 2013-11-08 |
KR20140004754A (en) | 2014-01-13 |
JP2014506470A (en) | 2014-03-17 |
US20140020699A1 (en) | 2014-01-23 |
MX2013009504A (en) | 2014-03-27 |
CA2824731C (en) | 2016-02-09 |
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