Classifications

• • 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
• • 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
  • A24B15/28—Treatment of tobacco products or tobacco substitutes by chemical substances
  • A24B15/287—Treatment of tobacco products or tobacco substitutes by chemical substances by inorganic substances only
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
  • A24B3/00—Preparing tobacco in the factory
  • A24B3/12—Steaming, curing, or flavouring tobacco
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
  • A24B3/00—Preparing tobacco in the factory
  • A24B3/18—Other treatment of leaves, e.g. puffing, crimpling, cleaning

Definitions

• the present disclosure relates to a method of processing pH-treated tobacco material, for example pH-treated tobacco granules or particles used in tobacco industry products.
• the present disclosure relates to a pH-treated tobacco material obtained from said method, as well as a method of storing pH-treated tobacco material, and a storage container obtained from said method.
• Tobacco industry products include smoking articles such as cigarettes, cigars and the like, which burn tobacco during use, as well as alternatives that release compounds from smokeable material without combusting. Examples of such products are tobacco heating devices or products which release compounds by heating, instead of burning.
• Tobacco industry products also include electronic aerosol provision systems which generally contain a cartomiser with a reservoir of a liquid formulation, and/or a substrate material such as a tobacco-based product, from which aerosol or vapour is generated for inhalation by a user, for example through heat vaporisation.
• nicotine and often flavourants or flavour agents are present in the liquid of the reservoir and/or the substrate material.
• local regulations or other reasons such as sensory or otherwise mean that nicotine can only be present in the substrate material.
• an aerosol provision system will typically comprise a cartomiser with an aerosol or vapour generating element (a vaporiser), e.g. a heater, arranged to aerosolise a portion of precursor material to generate aerosol in an aerosol generation chamber, and a substrate material containing nicotine.
• a vaporiser e.g. a heater
• aerosolise a portion of precursor material to generate aerosol in an aerosol generation chamber
• substrate material containing nicotine e.g. a substrate material containing nicotine
• a method of processing pH-treated tobacco materia! comprising contacting at least one pH-treated tobacco materia! with an effective amount of one or more gases, wherein the one or more gases reduce the pH of the pH-treated tobacco material, and wherein the reduction in pH of the pH-treated tobacco materia! is reversible.
• the one or more gases may comprise carbon dioxide.
• at least about 20% by volume of the one or more gases may be carbon dioxide.
• from about 25% to about 100% by volume of the one or more gases may be carbon dioxide.
• from about 50% to about 100% by volume of the one or more gases may be carbon dioxide.
• the one or more gases consist essentially of carbon dioxide, where the expression“consist essentially of has its normal meaning in the art of including further components which do not materially affect the essential characteristics of the gases.
• the initial pH of the at least one pH-treated tobacco material may be greater than 7, for example from about 8 to about 10.
• the pH of the pH-treated tobacco material is reduced by the one or more gases, this reduction may be to a pH value of less than 7. for example from about 5 to about 6.5.
• any reduction in pH will be advantageous and the present disclosure is not limited to a specific reduction from the initial pH.
• a method of storing pH-treated tobacco material can comprise (i) placing pH-treated tobacco material in a storage container; and either (ii) sealing the storage container and (iii) processing the pH-treated tobacco material according to the processing method described herein, or (ii) processing the pH-treated tobacco material according to the method described herein, and (iii) sealing the storage container.
• the method can comprise (i) processing pH-treated tobacco material according to the method described herein, (ii) placing the tobacco material obtained from processing step (i) in a storage container, and (iii) sealing the storage container.
• the storage container may be a sealed container suitable for bulk storage of the pH-treated tobacco material, or a sealed packaging element suitable for individual storage of the pH- treated tobacco material.
• the terms“bulk storage” and“individual storage” are discussed further herein.
• a storage container comprising tobacco material obtained by the storage method described herein, wherein the pH of the tobacco material increases upon exposure to normal atmospheric conditions.
• Figure 1 is a highly schematic cross-section of a storage container 1 in accordance with certain embodiments of the disclosure. As is discussed in more detail below, Figure 1 shows a sealed storage container 1 comprising pH-treated tobacco material 2 and one or more gases 3 which consist essentially of carbon dioxide. It will be appreciated by the person skilled in the art that Figure 1 is not drawn to scale.
• FIGS 2 to 4 are flow-charts showing the key steps of the storage method according to certain embodiments of the disclosure.
• the present disclosure provides a method of processing pH-treated tobacco material, a tobacco material obtained by said processing method, a method of storing pH-treated tobacco material, a storage container comprising tobacco material obtained by said storage method, and the use of carbon dioxide.
• These aspects of the present disclosure are surprisingly able to improve the shelf-life or bulk storage time of pH-treated tobacco material, for example, pH-treated tobacco granules or particles used in tobacco industry products.
• tobacco industry product is intended to include: combustible smoking articles, such as cigarettes, cigarillos, cigars, and tobacco for pipes or for roll-your-own or for make-your-own cigarettes (whether based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, tobacco substitutes or other smokeable material): non-combustible aerosol provision systems, such as heating devices that release compounds from aerosolisable materials without burning the aerosolisable materials, such as electronic cigarettes, tobacco heating products, and hybrid systems to generate aerosol using a combination of aerosolisable materials; articles comprising aerosolisable material and configured to be used within one of these noncombustible aerosol provision systems; and aerosol-free stimulant delivery articles, such as lozenges, gums, patches, articles comprising inhalable powders, and smokeless tobacco products such as snus and snuff, wherein the stimulant may or may not comprise nicotine.
• non-combustible aerosol provision systems such as heating devices that release compounds from aerosolisable materials without burning the aerosolisable materials
• vapour and “aerosol” and related terms such as “vaporise”, “volatilise” and “aerosolise” may be used interchangeably.
• Aerosol provision systems or devices may therefore be referred to herein as“vapour provision systems or devices”, “aerosol delivery systems or devices”, “electronic vapour provision systems or devices”, “electronic aerosol provision systems or devices”, or“e-cigarettes or electronic cigarettes”. These terms may be used interchangeably and are intended to refer to non- combustible aerosol provision systems or devices such as a heating device that releases compounds from aerosolisable material(s), e.g. tobacco material, without burning the aerosolisable material(s).
• the non-combustible aerosol provision system can include electronic cigarettes or e-cigarettes that create aerosol from aerosol precursor materials by heating or other techniques such as vibration; and hybrid systems that provide aerosol via a combination of aerosol precursor materials and solid substrate materials, for example hybrid systems containing liquid or gel precursor materials and a solid substrate material.
• the inventors recognised that a tobacco industry product containing pH-treated tobacco material often fails to provide a satisfactory experience to a user when the pH-treated tobacco material has been stored for a significant period of time prior to use. This was observed when the pH-treated tobacco was stored in bulk or in individual compartments, but was particularly prevalent after storage of the tobacco in individual compartments, and the unsatisfactory user experience was primarily due to a reduction in the amount of nicotine available.
• nicotine has two basic nitrogens and can exist in a un-protonated, a mono-protonated or a di-protonated form.
• the protonated forms are not volatile, whilst the un-protonated form is highly volatile and is readily able to enter the gas phase with a vapor pressure at 25°C of 5.5 Pa.
• tobacco material is therefore generally pH treated before being used in tobacco industry products. The pH treatment raises the pH of the tobacco material from an acidic pH (e.g. 5.5) to an alkaline pH (e.g. 9.5) thereby deprotonating the nicotine and converting it into its volatile, free base form as shown below:
• the inventors realised, however, that the pH treatment and deprotonation of nicotine was causing significant nicotine stability issues when storing the pH -treated tobacco material for a length of time.
• pH treatment simultaneously reduced the shelf-life of the tobacco due to the volatility of the free-base nicotine.
• the present disclosure addresses these needs whilst improving product performance and user experience by contacting pH-treated tobacco material with an effective amount of one or more gases so as to reversibly reduce the pH of the pH-treated tobacco material.
• the reversible nature of the present method is particularly advantageous because it allows the methods described herein to be incorporated into existing tobacco processing and treatment technology, and also to be applied to bulk storage and individual (e.g. blister or the like) storage of a pH-treated tobacco material.
• the inventors believe that the reversible reduction in pH by the one or more gases is caused by the reversible formation of a weak acid from the gas(es) and water.
• the gas(es) used in the present method includes carbon dioxide
• the carbon dioxide is believed to react with water present in the pH-treated tobacco material and/or atmosphere so as to form carbonic acid, lowering the pH and protonating nicotine.
• the normal environment or normal atmospheric conditions i.e.
• the reversible formation of carbonic acid by carbon dioxide can be represented by the following equilibria:
• pH-treated tobacco material i.e. tobacco that has been subject to a pH treatment as is known in the art and described herein. As discussed further below, pH treatment increases the pH of the tobacco.
• identity of the tobacco material is not, however, limited.
• tobacco material before pH treatment is referred to as “tobacco material”, “tobacco starting material” or“starting tobacco material”.
• the tobacco starting material can be any type or grade of tobacco and includes any part, such as for example, the leaves or stems, of any member of the genus Nicotiana and reconstituted materials thereof.
• the tobacco starting material is, in one embodiment, from the species Nicotiana tabacum.
• the tobacco starting material may be from one variety of tobacco or from more than one variety of tobacco. As is known in the art, the latter can be referred to as a blend. Examples of tobacco varieties which may be used include, but are not limited to, Virginia, Burley, Oriental and Rustica tobaccos.
• the tobacco starting material may also comprise tobacco of a certain grade or quality. For example, the tobacco starting material may comprise tobacco of high, medium and/or low grade.
• the tobacco starting material may be subjected to known practices such as drying and curing. In one embodiment the tobacco starting material is cured prior to any pH-treatment.
• the tobacco starting material can also be in any suitable form.
• the tobacco starting material can be solid, liquid or gel. In one embodiment the tobacco starting material is a solid or a gel. In one embodiment the tobacco starting material is a solid. In another embodiment the tobacco starting material is in the form of a gel. in one embodiment the tobacco starting material is a solid and selected from cut-rag, ground tobacco or baled leaf.
• the tobacco starting material is a solid and either prior, at the same time as, or after pH treatment is processed into the form of particles, beads, granules, extrudates or the like, by any method known in the art, e.g. dry or wet granulation, chopping, shredding, cutting, crushing, milling, grinding, extruding or a combination thereof.
• Smaller tobacco particles, beads, granules, extrudates, or the like have a greater surface area to volume ratio and so are known to exhibit enhanced release of volatile components compared to particles of larger sizes. This is described, for example, in WO2019016535.
• the tobacco starting material is p re-treated or pre-processed into particles, beads, granules or extrudates of the desired size, and then subjected to pH treatment.
• the tobacco starting material may be ground into particles and then pH-treated as shown in Figure 1 of WO2019016535.
• the tobacco starting material is pre-processed or p re-treated into particles, beads, granules, extrudates or the like at the same time as pH treatment.
• the shape and/or size of the tobacco particles are not limited in the context of the present disclosure. The skilled person will be aware of suitable particle sizes and shapes.
• the tobacco starting material used in the present disclosure will include nicotine.
• the nicotine may be inherently present in the tobacco starting material and/or it may be added thereto. If any nicotine is added to the tobacco starting material, this will typically take place after pH treatment. Nicotine may also be added before pH treatment if so desired.
• the nicotine content of the tobacco starting material is not limited and depends on the desired dosage when the nicotine is aerosolised and inhaled by a user. Generally the nicotine content is between about 0.2 wt% and about 6 wt%, on a dry weight basis relative to the total weight of the tobacco starting material. All of the wt% values for the amount of nicotine are on a dry weight basis.
• nicotine is present in an amount of no greater than about 6 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.4 to about 6 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.8 to about 6 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1 to about 6 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1.8 to about 6 wt% based on the total weight of the tobacco starting material.
• nicotine is present in an amount of no greater than about 5 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.4 to about 5 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.8 to about 5 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1 to about 5 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1.8 to about 5 wt% based on the total weight of the tobacco starting material.
• nicotine is present in an amount of no greater than about 4 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.4 to about 4 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.8 to about 4 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1 to about 4 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1.8 to about 4 wt% based on the total weight of the tobacco starting material.
• nicotine is present in an amount of no greater than about 3 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.4 to about 3 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.8 to about 3 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1 to about 3 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1.8 to about 3 wt% based on the total weight of the tobacco starting material.
• nicotine is present in an amount of no greater than about 1.9 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of no greater than about 1.8 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.4 to about 1.9 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.4 to about 1.8 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.5 to about 1.9 wt% based on the total weight of the tobacco starting material.
• nicotine is present in an amount of from about 0.5 to about 1.8 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.8 to about 1.9 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.8 to about 1.8 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1 to about 1.9 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1 to about 1.8 wt% based on the total weight of the tobacco starting material.
• nicotine is present in an amount of less than about 1.9 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of less than about 1.8 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.4 to less than about 1.9 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.4 to less than about 1.8 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.5 to less than about 1.9 wt% based on the total weight of the tobacco starting material.
• nicotine is present in an amount of from about 0.5 to less than about 1.8 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.8 to less than about 1.9 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 0.8 to less than about 1.8 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1 to less than about 1.9 wt% based on the total weight of the tobacco starting material. In one embodiment nicotine is present in an amount of from about 1 to less than about 1.8 wt% based on the total weight of the tobacco starting material.
• the tobacco starting material or pH-treated tobacco material can include one or more further components.
• Such further components may be conventional in the sense that they are typically included in tobacco material or pH-treated tobacco material for tobacco industry products.
• the one or more further components include an active agent other than nicotine.
• This active agent can be a compound which has a biological effect on a user when inhaled, and may, for example, may be selected from botanicals or mixtures thereof, which are synthetic or natural in origin.
• the active agent may be a physiologically active material, which is a material intended to achieve or enhance a physiological response.
• the active substance may for example be selected from nutraceuticals, nootropics and psychoactives.
• the active substance may be naturally occurring or synthetically obtained.
• the active substance may comprise for example nicotine, caffeine, taurine, theine, vitamins such as B6 or B12 or C, melatonin, cannabinoids, or constituents, derivatives, or combinations thereof.
• the active substance may comprise one or more constituents, derivatives or extracts of tobacco, cannabis or another botanical.
• the active substance comprises nicotine. In some embodiments, the active substance comprises caffeine, melatonin or vitamin B12.
• the active substance may comprise or be derived from one or more botanicals or constituents, derivatives or extracts thereof.
• botanical includes any material derived from plants including, but not limited to, extracts, leaves, bark, fibres, stems, roots, seeds, flowers, fruits, pollen, husk, shells or the like.
• the material may comprise an active compound naturally existing in a botanical, obtained synthetically.
• the material may be in the form of liquid, gas, solid, powder, dust, crushed particles, granules, pellets, shreds, strips, sheets, or the like.
• Example botanicals are tobacco, eucalyptus, star anise, hemp, cocoa, cannabis, fennel, lemongrass, peppermint, spearmint, rooibos, chamomile, flax, ginger, ginkgo biloba, hazel, hibiscus, laurel, licorice (liquorice), matcha, mate, orange skin, papaya, rose, sage, tea such as green tea or black tea, thyme, clove, cinnamon, coffee, aniseed (anise), basil, bay leaves, cardamom, coriander, cumin, nutmeg, oregano, paprika, rosemary, saffron, lavender, lemon peel, mint, juniper, elderflower, vanilla, wintergreen, beefsteak plant, curcuma, turmeric, sandalwood, cilantro, bergamot, orange blossom, myrtle, cassis, valerian, pimento, mace, damien, marjoram, olive, lemon
• the mint may be chosen from the following mint varieties: Mentha Arventis, Mentha c.v., Mentha niliaca, Mentha piperita, Mentha piperita citrata c.v., Mentha piperita c.v, Mentha spicata crispa, Mentha cardifolia, Memtha longifolia, Mentha suaveolens variegata, Mentha pulegium, Mentha spicata c.v. and Mentha suaveolens.
• the active substance comprises or is derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is tobacco.
• the active substance comprises or derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is selected from eucalyptus, star anise, cocoa and hemp.
• the active substance comprises or derived from one or more botanicals or constituents, derivatives or extracts thereof and the botanical is selected from rooibos and fennel.
• the one or more further components may also include one or more flavours or flavouring agents.
• flavours or flavouring agents are known in the art, and may be inherently present in the tobacco starting material or may be added to the tobacco starting material or pH-treated tobacco material.
• flavour and flavourant refer to materials which, where local regulations permit, may be used to create a desired taste, aroma or other somatosensorial sensation in a product for adult consumers. They may include naturally occurring flavour materials, botanicals, extracts of botanicals, synthetically obtained materials, or combinations thereof.
• flavours or flavouring agents may be selected from the group consisting of liquorice, hydrangea, Japanese white bark magnolia leaf, chamomile, fenugreek, clove, menthol, Japanese mint, aniseed, cinnamon, herb, wintergreen, cherry, berry, peach, apple, spearmint, peppermint, lavender, cardamom, celery, cascarilla, Drambuie, bourbon, scotch, whiskey, nutmeg, sandalwood, bergamot, geranium, honey essence, rose oil, vanilla, lemon oil, orange oil, cassia, caraway, cognac, jasmine, ylang-ylang, sage, fennel, piment, ginger, anise, coriander, coffee, flavour enhancers, bitterness receptor site blockers, sensorial receptor site activators or stimulators, sugars and/or sugar substitutes (e.g.
• sucralose acesulfame potassium, aspartame, saccharine, cyclamates, lactose, sucrose, glucose, fructose, sorbitol, or mannitol), and other additives such as charcoal, chlorophyll, minerals, botanicals, or breath freshening agents.
• flavour(s) or flavouring agent(s) may be imitation, synthetic or natural ingredients or blends thereof, and may be in any suitable form, for example, oil, liquid, or powder, or liquid such as an oil, solid such as a powder or gas. It will be understood by the skilled person that the flavour(s) or flavouring agent(s) may be a multi-component flavour or flavouring agent or a single component flavour or flavouring agent.
• the flavour comprises menthol, spearmint and/or peppermint. In some embodiments, the flavour comprises flavour components of cucumber, blueberry, citrus fruits and/or red berry. In some embodiments, the flavour comprises eugenol. In some embodiments, the flavour comprises flavour components extracted from tobacco. In some embodiments, the flavour comprises flavour components extracted from cannabis.
• the flavour may comprise a sensate, which is intended to achieve a somatosensorial sensation which are usually chemically induced and perceived by the stimulation of the fifth cranial nerve (trigeminal nerve), in addition to or in place of aroma or taste nerves, and these may include agents providing heating, cooling, tingling, numbing effect.
• a suitable heat effect agent may be, but is not limited to, vanillyl ethyl ether and a suitable cooling agent may be, but not limited to eucalyptol, WS-3.
• flavour(s) inherently present in the tobacco starting material their release to a user from the pH-treated tobacco material may be enhanced by further treatment.
• suitable treatments and appreciate that such treatment can take place before, during or after the pH treatment of the tobacco starting material.
• the pH-treated tobacco material does not undergo any further treatment.
• the tobacco starting material or pH-treated tobacco material does not contain any added acid(s). In one embodiment the tobacco starting material or pH-treated tobacco material does not contain any added organic acid selected from the group consisting of benzoic acid, levulinic acid, malic acid, maleic acid, fumaric acid, citric acid, lactic acid, acetic acid, succinic acid, and mixtures thereof.
• any added organic acid selected from the group consisting of benzoic acid, levulinic acid, malic acid, maleic acid, fumaric acid, citric acid, lactic acid, acetic acid, succinic acid, and mixtures thereof.
• the terms“pH-treated tobacco material”,“pH-treated tobacco substrate” and “pH-treated tobacco” are used interchangeably herein to refer to a tobacco starting material which has undergone a treatment so as to increase its pH.
• the level of increase is not limited because it will depend on the initial pH of the tobacco starting material, and this depends on numerous factors including for example, the type of tobacco, pH treatment agent and the relative amounts of the tobacco starting material and pH treatment agent.
• the pH-treated tobacco material may be in any form, e.g. solid, liquid or gel. In one embodiment the pH-treated tobacco material is a solid or a gel. In another embodiment the pH-treated tobacco material is a solid. In another embodiment the pH-treated tobacco material is a gel.
• the form of the tobacco material is discussed in detail above (including the formation of particles, granules, beads and extrudates by methods known in the art and discussed in WO2019016535) and the skilled person would understand that the form of the tobacco starting material dictates the form of the pH-treated tobacco material.
• the pH treatment modifies the pH of the tobacco starting material from an acidic pH (less than 7) to an alkaline pH (greater than 7). In another embodiment the pH treatment modifies the pH so that the nicotine present in the tobacco starting material is deprotonated.
• the skilled person will know of suitable techniques to detect the nicotine protonation and/or deprotonation level(s), ..g. 1 H NMR spectroscopy, and thus be able to readily monitor and control the pH treatment.
• the normal, unadjusted pH of cured tobacco is slightly acidic, usually within the range of about 4.5 to about 6.5 and frequently approximately 5, for example 5.5.
• a pH treatment will then increase the pH to a basic pH of greater than 7.
• the pH treatment modifies the pH of the tobacco starting material from a pH in the range of about 4 to less than 7, to a pH of greater than 7.
• the pH treatment modifies the pH of the tobacco starting material from a pH in the range of about 5 to less than 7, to a pH of greater than 7.
• the pH of tobacco is measured using the CORESTA Recommended Method No. 69, “Determination of pH of Tobacco and Tobacco Products” (2017).
• This Recommended Method is applicable for the determination of pH in tobacco and tobacco products that are in the range 4 to 10, and involves preparing an aqueous extract of the tobacco or tobacco product sample and its pH determined using a pH electrode.
• the CORESTA Recommended Method No. 69,“Determination of pH of Tobacco and Tobacco Products” (2017) is incorporated herein by reference.
• the pH-treated tobacco material has a pH of about 7 to about 14. In another embodiment the pH-treated tobacco material has a pH of about 7 to about 13. In another embodiment the pH-treated tobacco material has a pH of about 7 to about 12. In another embodiment the pH-treated tobacco material has a pH of about 7 to about 1 1. In another embodiment the pH-treated tobacco material has a pH of about 7 to about 10.
• the pH-treated tobacco material has a pH of greater than about 8. In another embodiment the pH-treated tobacco material has a pH of about 8 to about 14. In another embodiment the pH-treated tobacco material has a pH of about 8 to about 13. In another embodiment the pH-treated tobacco material has a pH of about 8 to about 12. In another embodiment the pH-treated tobacco material has a pH of about 8 to about 1 1. In another embodiment the pH-treated tobacco material has a pH of about 8 to about 10.
• the pH-treated tobacco material has a pH of about 9.5.
• the pH-treated tobacco material has a pH of about 8.5.
• the pH treatment can, for example, involve applying a basic solution to the tobacco starting material. Such a method is described in WO2015025158 and is incorporated herein by reference.
• the basic solution can be an aqueous sodium carbonate solution or any other suitable basic solution such as sodium hydroxide or sodium phosphate.
• the pH treatment can also follow pre-processing or pre-treatment of the tobacco starting material into a form with reduced particle size as described in WO2019016535.
• the tobacco material may be dried to a particular moisture content. Such drying methods are known in the art along with desirable moisture contents, the latter typically depending on the application of the tobacco material.
• the tobacco material may be left to cool for a period of time, without external application of refrigeration or the like.
• the present disclosure relies on contacting pH -treated tobacco material as described herein with an effective amount of one or more gases, wherein the one or more gases reduce the pH of the pH -treated tobacco material, and wherein the reduction in pH of the pH-treated tobacco material is reversible.
• the effective amount of one or more gases is an amount suitable to reduce the initial pH of the pH-treated tobacco material by at least 0.1 pH. In another embodiment the reduction is at least 0.3 pH. In another embodiment the reduction is at least 0.5 pH. In another embodiment the reduction is at least 1 pH. In one embodiment the reduction is such that the pH-treated tobacco material has a pH of less than about 7, i.e. an acidic pH. Using routine techniques, the skilled person would be able to determine such an amount of the one or more gases being used.
• reversible has its normal meaning in the art, i.e. the reduction in pH caused by the one or more gases can be readily reversed so as to at least partially restore the pH-treated tobacco material to its initial pH. For example, if the one or more gases reduce the pH of the pH-treated tobacco material from about 9.5 to about 5.5, this reduction can be reversed to return the pH of the pH-treated tobacco material to about 7.5 or about 8.5.
• the reversal is at least about 50%, i.e. the reduction in pH is restored by at least about 50%.
• the reversal is at least about 60% or at least about 75% or at least about 80%.
• the reversal is at least about 90% or at least about 95%.
• the reversal is about 100%.
• the reversible nature of the pH reduction in the present disclosure is particularly advantageous because it means that the nicotine is only converted to its volatile, free base form when the pH-treated tobacco material is exposed to normal atmospheric conditions (e.g. air). It also reduces the loss of available nicotine because the processing method does not have a permanent impact or effect on the nicotine in the pH-treated material.
• the present disclosure can also be readily applied to bulk storage and individual (e.g. blister, capsule etc.) storage of the pH-treated tobacco material.
• the one or more gases comprise carbon dioxide. In an alternative embodiment, the one or more gases consist essentially of carbon dioxide. In a further alternative embodiment, the one or more gases consist of carbon dioxide; i.e. the gas is carbon dioxide.
• the one or more gases comprise at least 20% by volume carbon dioxide.
• the one or more gases comprise at least 25% by volume carbon dioxide.
• the one or more gases comprise at least 30% by volume carbon dioxide.
• the one or more gases comprise at least 35% by volume carbon dioxide.
• the one or more gases comprise at least 40% by volume carbon dioxide.
• the one or more gases comprise at least 45% by volume carbon dioxide.
• the one or more gases comprise at least 50% by volume carbon dioxide.
• the one or more gases comprise at least 55% by volume carbon dioxide.
• the one or more gases comprise at least 60% by volume carbon dioxide.
• the one or more gases comprise at least 65% by volume carbon dioxide.
• the one or more gases comprise at least 70% by volume carbon dioxide.
• the one or more gases comprise at least 75% by volume carbon dioxide.
• the one or more gases comprise at least 80% by volume carbon dioxide.
• the one or more gases comprise at least 85% by volume carbon dioxide.
• the one or more gases comprise at least 90% by volume carbon dioxide.
• the one or more gases comprise at least 95% by volume carbon dioxide.
• the one or more gases comprise at least 97% by volume carbon dioxide.
• the one or more gases comprise at least 99% by volume carbon dioxide.
• the one or more gases comprise from about 20% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 25% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 30% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 35% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 40% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 45% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 50% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 55% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 60 to about 100% by volume carbon dioxide.
• the one or more gases comprise from about 65% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 70% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 75% to about 100% by volume carbon dioxide. In one embodiment, the one or more gases comprise from about 80% to about 100% by volume carbon dioxide.
• the pH-treated tobacco material has a pH of greater than 7 and the one or more gases comprise from about 25% to about 100% by volume carbon dioxide.
• the pH-treated tobacco material has a pH of greater than 7 and the one or more gases consist essentially of carbon dioxide.
• the pH-treated tobacco material has a pH of greater than 7 and the one or more gases comprise from about 50% to about 100% by volume carbon dioxide.
• the reduction in pH by the one or more gases is not specifically limited. It will depend on the pH of the pH-treated tobacco material and on the one or more gases being used, amongst other factors. Given the effect of the reduction in pH - namely the protonation of nicotine - the pH of the pH-treated tobacco material is, in one embodiment, reduced to an acidic pH, i.e. a pH of less than 7.
• the reduction in pH by the one or more gases is about 0.1 pH. In another embodiment the reduction in pH is about 0.2 pH. In another embodiment the reduction in pH is about 0.3 pH. In another embodiment the reduction in pH is about 0.4 pH. In another embodiment the reduction in pH is about 0.5 pH. In another embodiment the reduction in pH is about 1.0 pH. In another embodiment the reduction in pH is about 1.5 pH. In another embodiment the reduction in pH is about 2.0 pH. In another embodiment the reduction in pH is about 2.5 pH. In another embodiment the reduction in pH is about 3.0 pH.
• the one or more gases reduce the pH of the pH-treated tobacco material to less than 7. In one embodiment the one or more gases reduce the pH of the pH-treated tobacco material to less than about 6.5. In one embodiment the one or more gases reduce the pH of the pH-treated tobacco material to less than about 6. In one embodiment the one or more gases reduce the pH of the pH-treated tobacco material to less than about 5. In one embodiment the one or more gases reduce the pH of the pH-treated tobacco material to less than about 4. In one embodiment the pH of the pH-treated tobacco material is reduced by the one or more gases to about 5.5.
• the present disclosure also provides a tobacco material obtained by the method described herein.
• the tobacco material obtained by the processing method differs from those of the art at least by the interaction of the one or more gases (e.g. carbon dioxide) with the material and the reversible modification of the pH.
• the one or more gases e.g. carbon dioxide
• the inventors believe that there is an interaction between the one or more gases and water present in the pH-treated tobacco material and/or atmosphere which results in the formation of a weak acid, lowering the pH and protonating nicotine.
• This pH modification is, however, reversible in that on exposure of the tobacco to normal atmospheric conditions, it returns towards its initial value.
• the tobacco material obtained by the processing method is therefore unique at least due to its“dynamic” pH. At the molecular level the tobacco material will also differ from known tobacco because of the interaction of the one or more gas(es) with the tobacco surface.
• the present disclosure provides a method of storing pH-treated tobacco material.
• the method has at least three possible configurations and the key steps of these configurations are set out as flow-charts in Figures 2, 3 and 4.
• the method may comprise (i) placing the pH-treated tobacco material in a storage container, (ii) sealing the storage container, and (iii) processing the pH-treated tobacco material according to the method described herein. This configuration is shown in Figure 2.
• the method may comprise (i) placing the pH-treated tobacco material in a storage container, (ii) processing the pH-treated tobacco material according to the method described herein, and (iii) sealing the storage container. This configuration is shown in Figure
• the method may comprise (i) processing the pH-treated tobacco material according to the method described herein, (ii) placing the tobacco material obtained from processing step (i) in a storage container and (iii) sealing the storage container. This configuration is shown in Figure 4.
• Figure 1 is a schematic cross-sectional view of an example storage container. It includes a storage container 1 comprising pH -treated tobacco material 2 and one or more gases 3 which consist essentially of carbon dioxide. As would be understood by the skilled person, the one or more gases may be as defined above.
• the example storage container of Figure 1 may be prepared by placing pH-treated tobacco material in the storage container, sealing the storage and then contacting the pH-treated tobacco material with an effective amount of one or more gases, wherein the one or more gases reduce the pH of the pH-treated tobacco material, and wherein the reduction in pH of the pH-treated tobacco material is reversible, i.e. processing the pH-treated tobacco material according to the method described herein (see Figure 2).
• the example storage container of Figure 1 may be prepared by placing pH-treated tobacco material in the storage container, contacting the pH-treated tobacco material with an effective amount of one or more gases, wherein the one or more gases reduce the pH of the pH-treated tobacco material, and wherein the reduction in pH of the pH-treated tobacco material is reversible (i.e. processing the pH-treated tobacco material according to the method described herein), and then sealing the storage container ( Figure 3).
• the example storage container of Figure 1 may be prepared by contacting the pH-treated tobacco material with an effective amount of one or more gases, wherein the one or more gases reduce the pH of the pH-treated tobacco material, and wherein the reduction in pH of the pH-treated tobacco material is reversible (i.e. processing the pH-treated tobacco material according to the method described herein), placing the pH- treated tobacco material in the storage container and sealing the storage container ( Figure 4).
• the present disclosure further provides a storage container obtained by said storage method.
• An example storage container is shown in Figure 1 ; although the skilled person will appreciate that the present disclosure is not limited to the specific arrangement shown in Figure 1. This figure is just provided by way of example.
• the storage container can be an apparatus or a container used for bulk storage, such as a sealed bag, box or the like.
• the storage container can also be an apparatus or container used for storage of pH-treated tobacco material on a smaller scale, this type of storage is referred to herein as “individual storage” because it is intended to refer to storage of consumer portions or individual portions of tobacco rather than larger quantities stored during shipment etc.
• the individual storage is a blister pack where each blister contains a single dosage or portion of the tobacco material.
• the individual storage is a tobacco pod.
• the storage container is a sealed container.
• the sealing of the container is not limited and can be achieved by any method known in the art which results in an airtight seal.
• the storage container is a hermetically sealed container.
• the store is a sealed blister in a blister pack or a sealed tobacco pod. Again the sealing can be achieved by any method known in the art which results in an air tight seal.
• the storage container obtained by the above method can be used in the bulk shipment and storage of pH treated tobacco material to increase bulk storage time, or in blister packs, tobacco pods or the like to increase shelf-life of pH-treated tobacco material.
• the terms“bulk storage time” and“shelf-life” are discussed further below.
• the present disclosure further provides the use of carbon dioxide to increase the shelf-life or bulk storage time of pH-treated tobacco material.
• bulk storage time is meant the time when the pH-treated tobacco material is subject to bulk storage or stored in bulk, e.g. during shipment.
• shelf-life is meant the time when the pH-treated tobacco material is available to a user, e.g. the time when the product is available for purchase and use.
• the present disclosure provides an improvement in both scenarios.
• the present disclosure also provides an improvement in supply chain time, i.e. the time from sealing the blister, capsule, pod or the like at source to the time when the product is available for purchase.
• CORESTA Recommended Method No. 84 details how aerosol is generated and collected from electronic cigarettes by a standard procedure. The collected matter is then dissolved in a solvent and the glycerin, propylene glycol, water and nicotine content of this solution are determined by gas chromatography. Aerosol collected mass may be determined gravimetrically, and results are expressed as the weight of analyte collected per device, per weight of collected aerosol, per puff, or per puff set as warranted. The equipment and reagents for the analysis, including the gas chromatography analysis, are detailed in the CORESTA Method.
• CORESTA Recommended Method No. 62 is entitled“Determination of nicotine in tobacco and tobacco products gas chromatographic analysis”, and describes how the nicotine content of a sample of tobacco or a tobacco product (referred to herein as“blend nicotine”) is determined by liquid/liquid extraction into an organic extraction solvent containing an internal standard, followed by gas chromatographic analysis with flame ionization detection. Either MTBE or n-hexane may be used as the organic extraction solvent since no significant difference is seen between the results obtained by the two different methods. The equipment and reagents for the analysis are detailed in the CORESTA Method.
• the blend and/or aerosol nicotine is measured in the present disclosure according to the above-mentioned CORESTA methods, namely CORESTA Recommended Method Nos. 81 , 84 and 62. These CORESTA methods are therefore incorporated herein by reference.
• an increase in shelf-life or bulk storage time can be determined by measuring the blend nicotine or aerosol nicotine of a pH-treated tobacco material stored under carbon dioxide, and comparing it with the blend or aerosol nicotine of a pH-treated tobacco material not stored under carbon dioxide, e.g. stored in air.
• all variables should be kept constant except for the storage environment. For example, two samples of a pH-treated tobacco material could be stored under ambient temperature and pressure for 3 months, one could be stored under air and one could be stored under carbon dioxide.
• Various embodiments of the present disclosure may suitably comprise, consist of, or consist essentially of, appropriate combinations of the disclosed elements, components, features, parts, steps, means etc. other than those specifically described herein.
• this disclosure may include other disclosures not presently claimed, but which may be claimed in future.

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• 2019
  • 2019-03-07 GB GBGB1903083.2A patent/GB201903083D0/en not_active Ceased
• 2020
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  • 2020-02-14 WO PCT/GB2020/050355 patent/WO2020178546A1/en active Application Filing
  • 2020-02-14 US US17/436,846 patent/US20220125097A1/en active Pending
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