EP2544551A1 - Traitement de la chicorée séchée - Google Patents

Traitement de la chicorée séchée

Info

Publication number
EP2544551A1
EP2544551A1 EP10707283A EP10707283A EP2544551A1 EP 2544551 A1 EP2544551 A1 EP 2544551A1 EP 10707283 A EP10707283 A EP 10707283A EP 10707283 A EP10707283 A EP 10707283A EP 2544551 A1 EP2544551 A1 EP 2544551A1
Authority
EP
European Patent Office
Prior art keywords
chicory
soaking
pieces
chicory pieces
acrylamide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10707283A
Other languages
German (de)
English (en)
Inventor
Thierry Labrunie
Sylvain Kilchherr
Jean-Louis Duffey
Alexander Mathys
Stephan Palzer
Viviane Andrée Claude THEURILLAT-MORITZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nestec SA
Original Assignee
Nestec SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nestec SA filed Critical Nestec SA
Publication of EP2544551A1 publication Critical patent/EP2544551A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
    • A23F5/00—Coffee; Coffee substitutes; Preparations thereof
    • A23F5/44—Coffee substitutes
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/20—Removal of unwanted matter, e.g. deodorisation or detoxification
    • A23L5/27—Removal of unwanted matter, e.g. deodorisation or detoxification by chemical treatment, by adsorption or by absorption
    • A23L5/276—Treatment with inorganic compounds

Definitions

  • the present invention relates in general to a method for treating dried chicory in order to reduce acrylamide formation during subsequent processing steps such as roasting and extraction. After this treatment, the treated chicory may be processed to prepare soluble beverage compositions such as soluble coffee-substitute compositions or soluble coffee- mixture compositions.
  • Acrylamide was classified by the WHO International Agency for Research on Cancer (IARC) as a probable human carcinogen in 1994 on the basis of animal studies. At the time, it was believed that exposure resulted mainly from smoking and occupational activities. In April 2002, it was found that some food products, especially starchy foods such as crisps, French fries and bread, contained significant levels of acrylamide. Although no clear correlation between dietary intake of acrylamide and cancer risk has been evidenced, efforts are now made to minimize dietary exposure to acrylamide.
  • IARC International Agency for Research on Cancer
  • Acrylamide is one of the reaction products generated in foods during frying, baking or roasting, in Maillard reaction processes at high temperatures (e.g. above 120°C). Acrylamide results from the reaction between reducing sugars such as glucose and fructose with the lateral chain of some amino acids such as asparagine and methionine.
  • the Maillard reaction is a desired reaction in food processing because it provides pleasant odour and taste to cooked foods, together with a change in colour.
  • US 2004/0224066 also deals with a method for suppressing acrylamide formation by treating a food product with an acrylamide-formation suppressing agent prior to a high temperature heating step.
  • the acrylamide-formation suppressing agent may be selected from a multivalent cation, a chelating compound, a carbonyl group blocker or a combination of any of these agents.
  • An acrylamide generation depressant comprising a calcium salt, a basic amino acid or its salt and/or rosemary extract and being added to a processed food consisting mainly of carbohydrate prior to heat treatment is the subject of JP2005-278448.
  • US 2004/0126469 is also concerned with a method for decreasing acrylamide in food cooked under heat by providing the food with a polyvalent metallic compound.
  • US 2007/178219 pertains to acrylamide- reducing agents which are added to cell walls having asparagine and which have been weakened.
  • Co-pending European patent application EP 08163899 relates to a method of manufacture of roasted chicory with the objective of reducing acrylamide formation during the roasting process.
  • the method comprises a step of soaking fresh chicory pieces with a divalent cation aqueous solution.
  • this application does not address industrial scale processing of chicory.
  • An object of embodiments of the invention is thus to provide an adapted processing method for the manufacture of coffee mixtures or coffee substitutes comprising roasted chicory, which minimises the production of undesirable compounds.
  • the method should have minimal impact on the visual and organoleptic properties of coffee mixtures or coffee substitutes.
  • an aspect of the invention is a method of treatment of chicory pieces which comprises a step of soaking non-roasted chicory pieces with an aqueous solution comprising divalent cations, followed by a step of steaming said chicory pieces.
  • Figure 1 shows a schematic industrial line for soaking chicory pieces in a bath.
  • the present invention is part of a method for the manufacture of roasted chicory. It was found that less acrylamide is formed during a heat treatment such as roasting, when the heat treatment is performed on chicory soaked with divalent cations, instead of untreated chicory. The amount of acrylamide in the heat treated products is therefore considerably reduced compared to heat treated products having not undergone the soaking step of the present invention. As a comparison, acrylamide content in roasted chicory may range between 800 ppb and 10800 ppb . In Europe, acrylamide content in roasted chicory usually ranges between 3000 ppb and 10800 ppb. This variability reflects the differences between varieties, climates, crop and roasting conditions.
  • the method of the invention allows a reduction of at least 60% of the acrylamide level in roasted chicory. In some cases, the reduction of the acrylamide level in roasted chicory may be greater than 75 %, or even 90 %. This provides a great advantage over methods of the prior art.
  • chicory chicory roots, and more precisely roots of the plant Cichorium intybus L., as used in the art in the manufacture of chicory-based products and coffee substitutes comprising chicory.
  • Other coffee substitutes are known. Usually, they undergo various treatments, including roasting, before being used as coffee substitutes. Further examples of coffee substitutes are wheat bran, barley, malt, rye, acorns, figs, groundnuts, dates, carobs, lupins, chickpeas, or soy beans.
  • the fresh chicory roots are washed to remove dirt and stones. Then, typically, the washed chicory is chopped into pieces such as chips, cubes or slices. Usually, said pieces have a dimension of about 10 to 50 mm.
  • chicory slices or slices may be from about 5 mm to about 10 mm thick, for instance 8 mm thick, and from 10 to 50 mm long. Cubes may have side dimensions ranging from about 8 mm to about 15 mm.
  • the word "cube" is not intended to mean only perfectly regular cubes. It also encompasses pieces that have an overall cube shape.
  • fresh chicory has a water content of about 75% by weight. For this reason, it is very sensitive to mold and other microbial spoilage.
  • Fresh chicory cannot be stored long and must be processed within a short timeframe after harvest, usually less than 3 weeks under cold conditions. Drying the fresh chicory pieces to a water content of below 15% weight, preferably to a water content of between 10 and 13% by weight may be useful. Indeed, chicory pieces thus may be stored for later use.
  • This has two advantages. First, production can be performed throughout the year by using dried chicory instead of fresh chicory as a starting material. Second, the plants and equipments need not be dimensioned to process all the fresh chicory in a very short period of time. Instead, plants and equipments with smaller capacity can be commissioned, but with the perspective of working throughout the year.
  • the divalent cation should be food-grade.
  • the divalent cation is selected from calcium, magnesium or mixtures thereof.
  • the divalent cation is provided as a food-grade salt.
  • the salt may be selected among chloride, sulphate, phosphate or carbonate salts, or mixtures thereof.
  • calcium chloride, magnesium chloride, calcium sulphate, magnesium sulphate or calcium carbonate are used, or mixtures thereof.
  • chloride salts are used.
  • the aqueous solution may be a calcium chloride solution or a magnesium chloride solution.
  • sulphate salts are used.
  • the aqueous solution is a magnesium sulphate solution.
  • the selected salt or salts is dissolved into water, up to the desired divalent cation concentration. Then the aqueous solution is used for soaking the chicory pieces. It is also possible to prepare a concentrate divalent cation solution which is dosed into water to prepare the soaking solution.
  • the soaking step may be carried out by many methods. For instance, it may include spraying, coating, dipping or washing .
  • dried chicory pieces are soaked by spraying the soaking solution on the chicory pieces.
  • chicory pieces are distributed on a conveyor belt that transports the chicory pieces into a spraying tunnel.
  • Spraying nozzles are distributed along the transport path.
  • the nozzles are fed with the aqueous solution under pressure in order to generate a mist into the spraying tunnel and thus soak the chicory pieces with the aqueous solution of divalent cation.
  • the chicory pieces are fed into a rotating drum.
  • the drum can be inclined to allow for gravitational transport of the chicory pieces through it.
  • the drum can also be equipped inside with helicoidal blades for conveying the chicory pieces through it.
  • the drum is equipped with nozzles as described above. In each case, a continuous soaking is achieved. Excess soaking solution can be collected. Then the divalent cation concentration can be adjusted before recirculation.
  • the soaking step is carried out by placing the chicory pieces into a bath 1 of the soaking solution, for a predetermined period of time, with or without agitation. Soaking may be achieved in a continuous process or a batch process and various installations may be designed by a skilled person. For instance, chicory pieces are poured from a hopper onto a conveyor belt that circulates in said soaking solution. After the soaking step, the chicory pieces are removed from the bath, and can be used in downstream processes. In another installation, the chicory pieces are poured from a hopper 2 into a container 3 with walls that retain the chicory pieces inside the container while allowing water to flow through the container.
  • the container is placed in a tank containing the soaking solution for a predetermined period of time. Instead of being static in the tank, the container can be transported through tank 4 in the soaking solution with an overhead conveyor 9. Once the chicory pieces are soaked, they are removed from the bath, excess solution is drained at a draining station 5 and the soaked chicory pieces can be discharged from the container 3 onto a conveyor belt 6 and used in downstream processes. Drained solution is collected 7 and recirculated 8. From time to time, it may be necessary to adjust the divalent cation concentration in the soaking solution, due to the progressive exhaustion of the solution during soaking of the chicory pieces. Dosing 10 and mixing 11 equipment are provided to prepare the soaking solution, which is then circulated towards the bath through nozzles 12.
  • the soaking step is performed by placing the chicory pieces in a bath of the soaking solution, it may be useful to apply a pulsed electric field (PEF) to the chicory pieces.
  • PEF pulsed electric field
  • the total energy applied on the chicory pieces varies from 10 kJ/kg to 200 kJ/kg, preferably from 70 kJ/kg to 170 kJ/kg.
  • a PEF treatment lasts between 10 seconds and 10 minutes, with a voltage of 15 kV to 25 kV per pulse, and a frequency of between 150 and 250 pulses/minute.
  • the duration of the bath treatment may be split into periods with or without simultaneous PEF treatment.
  • the chicory pieces may be placed in a bath of soaking solution for 10 minutes to a few hours.
  • a PEF treatment may be triggered in the same bath, for a few seconds to 10 minutes.
  • the overall relative humidity of the chicory pieces is brought back to between 20% and 75% by weight. If the overall relative humidity is lower than 50%, it appears that the divalent cations penetrate less into the chicory pieces. However, the steaming step then helps improve the diffusion of the soaking solution into the chicory pieces.
  • the soaking time depends on the size of the chicory pieces, on the concentration of the soaking solution and on the soaking method which is implemented.
  • the soaking step can last from about 15 minutes to 24 hours.
  • the length of the soaking step will decrease when the concentration of divalent cations in the soaking solution increases. In general, between 30 minutes and 24 hours will be needed when processing dried chicory.
  • the length of the soaking step is reduced: it can last between 10 seconds and 10 minutes.
  • the soaking step is preferably carried out at ambient temperature, usually less than 25°C, and preferably between 4 and 10 °C. It was found that the temperature of soaking does not seem to have an impact on the reduction of acrylamide formation, compared to heated water. Therefore, soaking the chicory pieces at these preferred temperatures reduces the energy costs while causing no negative influence on the efficiency of the method of the invention.
  • the concentration of divalent cations in the aqueous solution used for soaking is at least about 1.0 wt% .
  • the concentration of divalent cations may be as high as the saturation concentration.
  • the saturation concentration depends on the salt used, or mix of salts.
  • the soaking step offers the further advantage that the roasted chicory is enriched in minerals such as calcium and magnesium, which provide the associated health benefits.
  • the method of treatment of chicory pieces further comprises a step of steaming the soaked chicory pieces.
  • the steaming step is performed at a temperature from 95°C to 150°C, under a pressure from atmospheric pressure to 6 bars. Atmospheric pressure is about 1 bar. Preferably, the steaming step is performed for
  • the length of the steaming step increases when the pressure or the temperature decrease.
  • this operation should be performed fast, preferably between 2 and 15 minutes, in order to avoid a too important denaturation of the chicory product.
  • the steaming step may be performed in appropriate equipment, such as a steamer, an autoclave or a stove .
  • Acrylamide content can be measured by LC-MS/MS.
  • a method for sample preparation and acrylamide measure is described for instance in an article by Delatour et al . "Improved sample preparation to determine acrylamide in difficult matrixes such as chocolate powder, cocoa, and coffee by liquid chromatography tandem mass spectroscopy” J. Agric. Food Chem. (2004) 52:46251, or in an article by Arisseto et al . "A modified sample preparation for acrylamide determination in cocoa and coffee products” Food Anal. Methods (2008) 1:49.
  • roasting time is shorter when processing soaked chicory pieces rather than non-soaked chicory pieces.
  • roasting may also be achieved at a lower temperature.
  • Roasting has the effect of providing the desired visual appearance to the coffee or coffee substitute. Flavours and aromas also develop during roasting.
  • roasting temperature may be carried out at a temperature of 100 to 200°C, preferably 130-180°C.
  • the roasting temperature is not necessarily maintained at a constant level.
  • the roasting temperature is increased from between 130°C and 150°C to between 160°C and 175°C in the last minutes of roasting .
  • Roasting is terminated when the chicory pieces have reached the desired colour. This is assessed using sensory evaluation, which also takes into account further criteria such as flavour or smell.
  • the chicory is preferably dried before roasting.
  • drying parameters are set in order to reach shelf-stable moisture content, as described above for untreated chicory. Drying may be carried out using standard industrial methods known in the art such as drying in the sun or drying using various apparatus such as a drying drum, a drying tunnel or a belt drier.
  • the drying time depends on the drying method and on the target humidity. For instance, drying in the sun may take up to 36 hours, whereas drying in a tunnel could be as short as a few hours, for instance 4 hours.
  • the humidity of the chicory pieces after drying is below 18% humidity, and more preferably below 15%.
  • the final humidity of the chicory pieces should not be too low, otherwise the subsequent roasting step will not allow for a satisfactory flavour and colour development.
  • the final humidity is greater than 10%.
  • the final humidity of the dried chicory pieces is about 12
  • the soaked non-roasted chicory is roasted.
  • the roasting is carried out at a temperature of 110 to 180°C, more preferably about 120 to 160°C.
  • the roasting step is carried out for a period of 10 to 120 minutes, more preferably about between 60 and 90 minutes.
  • the prior soaking step offers the advantage that the roasting time and/or the roasting temperature can be considerably reduced. Indeed, the colour development desired upon roasting is achieved much more rapidly than in cases where the soaking step has not been carried out.
  • the shorter roasting time or lower roasting temperature compared to traditional roasting time or temperature required to roast chicory enables energy savings, as well as provides the final product with very good visual and organoleptic properties.
  • the product obtainable by any embodiments of the method described above thus also forms part of the invention.
  • Such product offers the advantages that the amount of acrylamide present in such product is considerably reduced compared to products obtained by traditional roasting processes.
  • the products obtainable by the process have an acrylamide content of less than 2500 ppb (parts per billion) , preferably less than 2000 ppb, and even more preferably less than 1800 ppb.
  • the products obtainable by the process have an acrylamide content of less than 1500 ppb, preferably less than 900 ppb.
  • the products obtainable by the process have an amount of acrylamide of less than 500 ppb, preferably less than 300 ppb, and more preferably less than 150 ppb.
  • they are enriched in terms of calcium and/or magnesium when using these preferred cations in the soaking step of the invention.
  • the resulting products are thus healthier, while having excellent organoleptic and visual properties.
  • the roasted chicory obtainable by the method of the invention may be used as such or may be further processed depending on the desired end product.
  • Such further processing step may include grinding, mixing, extraction, spray-drying, freeze-drying etc.
  • roasted and ground (R&G) chicory may be used as such as a coffee substitute.
  • R&G chicory may be used to brew a beverage, which is considered as a coffee substitute, with a traditional filter coffee- machine for instance.
  • R&G chicory could also be mixed with R&G coffee, to obtain a coffee mixture, which may also be used to brew a coffee-like beverage.
  • coffee mixtures should be understood as compositions comprising coffee solids and chicory solids. Coffee mixtures may optionally comprise other ingredients such as other coffee substitutes, sweeteners, whiteners, foamers, and mixtures thereof. Still in the context of the instant invention, “coffee substitutes” relate to compositions which comprise chicory solids and optionally other ingredients such as other coffee substitutes, sweeteners, whiteners, foamers, and mixtures thereof. Coffee substitutes do not comprise coffee solids .
  • Such coffee substitute lends itself perfectly for incorporation in coffee-based food products or beverages, such as instant drink compositions for example.
  • Instant drink coffee mixtures are considered.
  • roasted chicory prepared according to the method disclosed herein may undergo an extraction, alone or together with various amounts of roast and ground coffee, under conditions known to the skilled person. This results in a chicory extract or a coffee and chicory extract, which may be used in the manufacture of instant drink compositions.
  • a soluble coffee mixture composition or coffee substitute composition comprising the roasted chicory of the invention is thus also part of the invention.
  • Such soluble composition can be in the form of freeze- dried or spray-dried granules, freeze-dried or spray-dried powders, concentrates, etc. as is known in the art to a skilled person.
  • a container was filled with dried chicory slices. Then a saturated solution of divalent cations salts (MgCl 2 or MgS04) was poured into the container to bath the chicory slices. A pulsed electric field was applied, for a total energy of 150 kJ/kg. After treatment, the solution was drained and the chicory pieces were placed in an autoclave under a pressure of 3 bars, a temperature of 130°C and during 10 minutes. Chicory pieces with a relative humidity of about 60 ⁇ 6 were obtained then dried in a drum dryer down to a relative humidity of about 12%. Roasting was then performed according to known methods .
  • MgCl 2 or MgS04 divalent cations salts
  • the level of acrylamide in the roasted chicory was measured.
  • the acrylamide level was lower in the treated chicory than in a sample of chicory which had not been treated with divalent cations.
  • the levels of acrylamide were reduces by about 50% to 80% in the treated chicory, depending on the salt used.

Abstract

La présente invention concerne un procédé de traitement de la chicorée, comprenant une étape consistant à faire tremper des morceaux de chicorée séchés non torréfiés dans une solution aqueuse contenant des cations divalents.
EP10707283A 2010-03-08 2010-03-08 Traitement de la chicorée séchée Withdrawn EP2544551A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/052925 WO2011110214A1 (fr) 2010-03-08 2010-03-08 Traitement de la chicorée séchée

Publications (1)

Publication Number Publication Date
EP2544551A1 true EP2544551A1 (fr) 2013-01-16

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EP10707283A Withdrawn EP2544551A1 (fr) 2010-03-08 2010-03-08 Traitement de la chicorée séchée

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EP (1) EP2544551A1 (fr)
WO (1) WO2011110214A1 (fr)
ZA (1) ZA201207495B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105231108A (zh) * 2015-11-10 2016-01-13 军株（大连）生物产业有限公司 原味菊粉的生产方法

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US20070141225A1 (en) * 2002-09-19 2007-06-21 Elder Vincent A Method for Reducing Acrylamide Formation
US20040058045A1 (en) * 2002-09-19 2004-03-25 Elder Vincent Allen Method for reducing acrylamide formation in thermally processed foods
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JP2005021152A (ja) 2002-12-16 2005-01-27 Toyo Suisan Kaisha Ltd アクリルアミドを低減化し得る加熱調理食品の製造方法
US20040224066A1 (en) 2003-02-26 2004-11-11 Lindsay Robert C. Method for suppressing acrylamide formation
JP2005278448A (ja) 2004-03-29 2005-10-13 Nissin Food Prod Co Ltd 加工食品のアクリルアミド生成抑制方法、アクリルアミド生成抑制剤、および、加工食品の製造方法
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WO2011110214A1 (fr) 2011-09-15
ZA201207495B (en) 2014-03-26

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