WO2023048195A1 - タンパク質発酵飲食品の製造方法 - Google Patents
タンパク質発酵飲食品の製造方法 Download PDFInfo
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- WO2023048195A1 WO2023048195A1 PCT/JP2022/035225 JP2022035225W WO2023048195A1 WO 2023048195 A1 WO2023048195 A1 WO 2023048195A1 JP 2022035225 W JP2022035225 W JP 2022035225W WO 2023048195 A1 WO2023048195 A1 WO 2023048195A1
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- protein
- fermented food
- drink
- food
- beverage
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Classifications
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- A23L29/00—Foods or foodstuffs containing additives; Preparation or treatment thereof
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- 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
Definitions
- the present invention relates to a method for producing protein-fermented food and drink. More specifically, the present invention relates to a protein-fermented food and drink, which is a technology for modifying the properties of the food and drink itself, such as its own stress, water retention, or syneresis suppression, or the properties of the fermented food and drink material with respect to the fermentation rate during production. Regarding.
- Patent Literature 1 discloses a method for producing yoghurt having a smooth texture inherent to yoghurt without causing syneresis by adding transglutaminase to a milk raw material.
- Patent Document 2 by adding glucose oxidase in the production process of fermented milk, compared to the case where glucose oxidase is not added, syneresis caused by aggregation of milk protein and increase in particle size of milk protein are significant.
- yogurt mix is blended with peroxidase and whey protein concentrate and/or whey protein isolate and fermented with lactic acid bacteria to produce fermented milk with smooth texture and reduced whey separation.
- a method of making is disclosed.
- the present invention provides various characteristics related to fermented food and drink using protein materials (especially, characteristics of the fermented food and drink itself, such as stress, water retention, or syneresis suppression, or fermented food and drink related to fermentation rate during production of fermented food and drink.
- the purpose is to provide a processing technology that can improve the characteristics of the product material).
- the present inventor applies a combination of protein deamidase and multi-copper oxidase, which is a combination of enzymes that has not been used as a means of improving various characteristics of fermented food and drink, to the process of producing protein fermented food and drink.
- the inventors have found that by doing so, the properties of the resulting protein-fermented food and drink are improved.
- the present invention has been completed through further studies based on this finding.
- Section 1 A method for producing a protein-fermented food or drink, comprising a step of fermenting a protein material and a step of treating with protein deamidase and multi-copper oxidase.
- Section 2. Item 2. The production method according to Item 1, wherein the protein deamidase is protein glutaminase.
- Item 3. Item 3.
- Section 4. Item 4. The production method according to any one of Items 1 to 3, wherein the protein material is milk.
- a protein fermented food and drink modifier comprising a protein deamidase and a multi-copper oxidase.
- Item 7. Item 7. The modifier according to Item 6, which is used as a stress-enhancing agent for protein-fermented food and drink.
- Item 8. Item 7. The modifier according to Item 6, which is used as a water retention improver for protein-fermented food and drink.
- Item 9. Item 7. The modifier according to Item 6, which is used as a syneresis inhibitor for protein-fermented food and drink.
- various characteristics related to fermented food and drink using protein materials in particular, characteristics such as stress, water retention, or syneresis suppression of the fermented food and drink itself, or fermentation related to fermentation rate during production of fermented food and drink characteristics of food and drink materials) can be improved.
- the method for producing protein-fermented food and drink of the present invention is characterized by including a step of fermenting a protein material and a step of treating with protein deamidase and multi-copper oxidase. As a result, various properties of the obtained protein-fermented food and drink can be improved.
- the method for producing the protein-fermented food and drink of the present invention will be described in detail.
- the various characteristics related to protein fermented food and drink are the characteristics of the fermented food and drink itself, such as stress, water retention, syneresis suppression, and digestibility; Refers to at least one of the characteristics of food and beverage ingredients.
- Protein material is not particularly limited as long as it contains protein and can be used as a food or drink material.
- the origin of the protein is also not particularly limited, and may be animal protein, plant protein, or synthetic protein.
- Animal proteins include milk proteins such as casein and ⁇ -lactoglobulin; egg proteins such as ovalbumin; meat proteins such as myosin and actin; blood proteins such as serum albumin; .
- Vegetable proteins include cereal proteins such as soybeans, peas, lupine beans, broad beans, chickpeas, mung beans, kidney beans; oats, barley, wheat, rye, rice, buckwheat, millet, millet, teff, quinoa, corn Cereal protein such as canary seed, flaxseed, almond, cashew nut, hazelnut, pecan nut, macadamia nut, pistachio, walnut, brazil nut, peanut, coconut, hemp, pili nut, chestnut, sesame, pine nut, etc. is mentioned.
- these proteins may be in the form of partially chemically degraded proteins by acids, alkalis, etc., partially enzymatically degraded proteins by proteases, or chemically modified proteins by various reagents.
- proteins may be used singly or in combination.
- animal proteins are preferred, and milk proteins are more preferred, from the viewpoint of further enhancing the effect of improving various properties of protein-fermented food and drink.
- the specific form of the protein material is not particularly limited as long as it can be used as a material for fermented food and drink, and it may be in any form such as liquid, gel, or solid, but liquid is preferred.
- liquid protein material examples include forms exhibiting fluidity, such as protein aqueous solutions, aqueous dispersions, and aqueous dispersion pastes.
- liquid protein material containing animal protein that is, liquid animal protein material
- milk egg liquid, egg liquid dilution, meat homogenate liquid, tendon protein solution, etc., preferably milk. is mentioned.
- the liquid protein material containing vegetable protein may be a liquid in which at least vegetable protein is dissolved and / or dispersed in water, and specific examples include (i ) Crushing and dispersing food raw materials containing vegetable protein in water, and if necessary, removing insoluble matter derived from skins of food raw materials by any means such as centrifugal filtration, filtration, filter bags, sieves, etc.
- a liquid obtained by dispersing a dry powder of a food raw material containing vegetable protein in water (iii) a liquid other than vegetable protein from the liquid of (i) or (ii) above (iv) a dry powder prepared from any of the above liquids (i) to (iii) dissolved and/or dispersed in water; and the like, preferably the liquid of (ii) above.
- a typical example of these liquid vegetable protein materials is so-called vegetable milk.
- the content of protein contained in the protein material is not particularly limited. .
- the upper limit of the content range of the protein contained in the protein material is not particularly limited. , 10 w/v% or less, 8 w/v% or less, 6 w/v% or less, or 4 w/v% or less.
- the protein material may contain other raw materials and/or food additives depending on the type of protein-fermented food and drink to be obtained (“1-7. Protein-fermented food and drink” below).
- Other raw materials include ingredients that are derived from the above-mentioned protein-containing food raw materials and inevitably coexist.
- Food additives are not particularly limited as long as they are food-safe. Examples include vegetable oils and fats; salt, sugar, spices, sodium L-glutamate, disodium 5'-ribonucleotide, 5'-inosine. seasonings such as disodium acid and disodium 5'-guanylate; antioxidants such as L-ascorbic acid; perfumes and the like.
- the timing of adding other raw materials and / or food additives is not particularly limited, and may be added at the time of subjecting to the fermentation process and / or the process of performing treatment with enzymes, or after the fermentation process and treatment with enzymes. It may be added after any of the steps performed have been completed.
- Microorganisms used for fermentation of the microbial protein material used for fermentation are not particularly limited as long as they give fermented food and drink, and examples thereof include lactic acid bacteria, bifidobacteria, koji molds, and yeasts.
- Lactic acid bacteria are not particularly limited, and examples thereof include Streptococcus lactic acid bacteria, Lactobacillus lactic acid bacteria, Leuconostoc lactic acid bacteria, and Lactococcus lactic acid bacteria.
- microorganisms may be used singly or in combination.
- lactic acid bacteria are preferred, and Streptococcus lactic acid bacteria and Lactococcus lactic acid bacteria are more preferred, from the viewpoint of further enhancing the effect of improving various properties of protein-fermented food and drink.
- Protein deamidase As the protein deamidase used in the present invention, any enzyme that exhibits the action of degrading an amide group-containing side chain of a protein without cleaving peptide bonds and cross-linking the protein can be used. is not particularly limited.
- Examples of protein deamidase include Chryseobacterium genus and Flavobacterium disclosed in JP-A-2000-50887, JP-A-2001-218590, and International Publication No. 2006/075772. ), Empedobacter, Sphingobacterium, Aureobacterium or Myroides-derived protein deamidase, and Chryseobacterium-derived protein glutaminase mentioned. As these protein deamidase enzymes, one type may be used alone, or a plurality of types may be used in combination.
- protein deamidase enzymes derived from the genus Chryseobacterium are preferable, and proteins derived from the genus Chryseobacterium are more preferable, from the viewpoint of further enhancing the effect of improving various properties of protein-fermented food and drink.
- Glutaminase more preferably protein glutaminase from Chryseobacterium proteolyticum species.
- the protein deamidase can be prepared from the culture solution of the microorganism from which the above protein deamidase is derived.
- a specific preparation method includes a method of recovering the protein deamidase from the culture solution or cells of the above microorganisms.
- the enzyme can be separated and/or purified after previously collecting the cells from the culture solution by filtration, centrifugation, or the like, if necessary.
- the cells were collected from the culture solution in advance, and then the cells were crushed by pressure treatment, ultrasonic treatment, or the like to expose the enzyme. The enzyme can then be isolated and/or purified.
- the enzyme separation and/or purification method known protein separation and/or purification methods can be used without particular limitation.
- Various chromatographic methods using The separated and/or purified enzyme can be pulverized by a drying method such as freeze-drying or vacuum drying, and pulverized using a suitable excipient and/or drying aid in the drying method.
- the separated and/or purified enzyme can be liquefied by adding appropriate additives and performing filtration sterilization.
- a commercial product can also be used as the protein deamidase, and a preferred example of a commercial product is protein glutaminase "Amano" 500 manufactured by Amano Enzyme Co., Ltd.
- the amount of protein deamidase used is not particularly limited, but examples of the amount of protein deamidase per 1 g of protein include 0.001 to 1000 mU and 0.005 to 250 mU. From the viewpoint of further improving the various properties related to the 0.3 to 30 mU, particularly preferably 0.4 to 10 mU, most preferably 0.4 to 1 mU.
- the amount of protein deamidase used is, for example, 0.00008 to 80 mU, 0.0004 to 20 mU, as the amount of protein deamidase per 1 U of multi-copper oxidase.
- 1 unit (1 U) is defined as the amount of enzyme that liberates 1 ⁇ mol of ammonia per minute using benzyloxycarbonyl-L-glutaminylglycine (Z-Gln-Gly) as a substrate.
- Multicopper oxidase used in the present invention is a group of enzymes containing multiple copper atoms in the molecule and oxidizing polyphenols, methoxyphenols, diamines, bilirubin, ascorbic acid, etc. with molecular oxygen.
- the number of copper atoms contained so far is usually 2 to 8, but this number is particularly limited because it varies depending on the state of the enzyme preparation at the time of analysis and the analysis method. not a thing
- Examples of enzymes classified as multicopper oxidases include laccase, bilirubin oxidase, ascorbate oxidase, ceruloplasmin, and the like.
- multi-copper oxidases may be used singly or in combination.
- laccase is preferred from the viewpoint of further improving various properties of fermented food and drink using protein materials.
- Laccase is an enzyme (EC 1.10.3.2) with phenol oxidase activity.
- laccases include laccases derived from microorganisms such as fungi and bacteria. More specifically, the genera Aspergillus, Neurospora, Podospora and Botrytis.
- Genus genus Collybia, genus Fomes, genus Lentinus, genus Pleurotus, genus Pycnoporus, genus Pyricularia, genus Trametes, genus Rhizoctonia, Derived from genus Rigidoporus, genus Coprinus, genus Psatyrella, genus Myceliophtera, genus Schtalidium, genus Polyporus, genus Phlebia, genus Coriolus, etc. of laccase.
- laccases may be used singly or in combination.
- Trametes-derived laccase and Aspergillus-derived laccase are preferred from the viewpoint of further improving various properties of fermented food and drink using protein materials, Trametes-derived laccase is more preferred.
- the amount of multi-copper oxidase used is not particularly limited, but the amount of multi-copper oxidase per 1 g of protein is, for example, 0.1 to 100 U, which further improves various characteristics of fermented food and drink using protein materials. From the point of view, it is preferably 1 to 50U, more preferably 5 to 20U, still more preferably 10 to 15U.
- ABTS 2,2'-Azino-di-[3-ethylbenzthiazoline sulfonate]
- the order of the step of fermenting the protein material and the step of treating with enzymes is arbitrary. That is, either the fermentation step or the enzyme treatment step may be performed first, and after the completion of the one step, the other step may be performed, or both steps may be performed simultaneously. Furthermore, when both steps are performed at the same time, both steps may be started at the same time, or one of the steps may be started earlier. From the viewpoint of further enhancing the effect of improving various characteristics of protein-fermented food and drink, it is preferable to perform both the fermentation step and the enzyme treatment step at the same time.
- reaction conditions in the step of fermenting the protein material such as reaction conditions , taking into consideration the thermal stability of the microorganisms and whether or not the step of treating with enzymes is performed at the same time.
- 20 to 45°C preferably 25 to 30°C.
- the time for the fermentation process can be appropriately determined by those skilled in the art according to the type of protein-fermented food and drink of interest, the fermentation temperature, etc., and may be, for example, 1 to 80 hours.
- the specific fermentation time is preferably 20 to 60 hours, more preferably 40 to 50 hours.
- specific fermentation time is preferably 1 to 15 hours, more preferably 2 to 10 hours, and still more preferably 3 to 8 hours.
- protein material can be added as appropriate along with the growth of microorganisms.
- reaction conditions in the step of enzymatic treatment can be appropriately determined by those skilled in the art, taking into account the optimum temperature of protein deamidase and multi-copper oxidase, and whether or not the step of fermentation should be carried out at the same time. However, for example, 4 to 80°C, preferably 15 to 50°C, more preferably 20 to 40°C, and still more preferably 25 to 30°C.
- the time required for the step of enzymatic treatment can be appropriately determined by those skilled in the art according to the degree of desired properties, the treatment temperature, and the like, and is, for example, 1 to 80 hours.
- the specific treatment time is preferably 20 to 60 hours, more preferably 40 to 50 hours, and the treatment temperature is 30°C.
- the specific treatment time is preferably 1 to 15 hours, more preferably 2 to 10 hours, and even more preferably 3 to 8 hours.
- Protein Fermented Food and Beverage The protein fermented food and drink produced by the production method of the present invention is not particularly limited. Examples of the form of protein-fermented food and drink include solid, gel, liquid, and the like. Specific examples of protein-fermented foods and drinks include yogurt (example of gel-like food), drinkable yogurt (example of beverage), yogurt paste (example of paste-like food, also used as a food material), cheese (solid Examples of shaped foods) and the like.
- a preferred form of protein-fermented food and drink is gel, and a preferred specific example of protein-fermented food and drink is yogurt (gel-like food). .
- a modifier for protein fermented food and drink The combination of protein deamidase and multi-copper oxidase is used in the production of protein fermented food and drink to improve various characteristics of the fermented food and drink itself, such as stress, water retention, and syneresis suppression. It is possible to improve the quality. Accordingly, the present invention also provides modifiers for protein-fermented food and beverage products, comprising protein deamidase and multi-copper oxidase.
- modifiers for protein fermented food and drink include stress improvers for protein fermented food and drink, water retention improvers for protein fermented food and drink, and/or syneresis inhibitors for protein fermented food and drink. things are mentioned.
- Fast brewing agent in the production of protein-fermented food and drink The combination of protein deamidase and multi-copper oxidase can be used in the production of protein-fermented food and drink to improve fermentation efficiency during production (that is, quick brewing). Accordingly, the present invention also provides a fast-brewing agent for the production of protein-fermented food and drink, containing protein deamidase and multi-copper oxidase.
- the type, amount, etc. of the ingredients used in the fast-brewing agent in the production of protein-fermented food and drink are as shown in the above "1. Production method of protein-fermented food and drink”.
- a solution prepared to 30 mmol/L by dissolving Z-Gln-Gly in 0.2 mol/L phosphate buffer (pH 6.5) was used as a substrate solution. Place 0.1 mL of the enzyme solution whose activity is to be measured in a test tube, leave it in a constant temperature water bath at 37 ⁇ 0.5° C. for 1 minute, then add 1 mL of the substrate solution that has been left at 37 ⁇ 0.5° C. for 10 minutes. , mixed immediately. This solution was allowed to stand for 10 minutes for an enzymatic reaction, and then 1 mL of 0.4 mol/L trichloroacetic acid solution was added to stop the enzymatic reaction.
- a measurement blank was prepared by adding 0.1 mL of enzyme solution to a test tube, followed by 1 mL of 0.4 mol/L trichloroacetic acid solution and 1 mL of substrate solution in that order.
- Ammonia-Test Wako (Fujifilm Wako Pure Chemical Industries, Ltd.) was used for color development reaction, and based on the absorbance value at a wavelength of 630 nm, the amount of ammonia liberated by the enzymatic reaction for 10 minutes was quantified.
- the amount of enzyme that produces 1 ⁇ mol of ammonia per minute was defined as 1 unit (1 U), and the activity value was calculated from the amount of ammonia liberated by the enzymatic reaction.
- ABTS was dissolved in 25 mM citrate buffer (pH 3.2) at a concentration of 1.0 mg/ml to prepare a substrate solution. 3.0 ml of this substrate solution was taken in a cuvette, preheated at 25° C., 0.1 ml of enzyme solution was added, stirred, incubated at 25° C., and absorbance at 405 nm was measured after 1 minute and 3 minutes. The amount of enzyme that increased the absorbance at 405 nm by 1.0 OD per minute under these conditions was defined as 1 unit (U).
- the weight of the obtained yogurt was measured, and then centrifuged at 1000 ⁇ g for 10 minutes at 20° C., the supernatant was recovered, and the weight of the remaining yogurt was measured.
- the water holding capacity (%) was derived based on the following formula. It can be evaluated that the larger the value of the water retention capacity, the more the water retention is improved.
- the weight (V1 (g)) of yogurt was measured before refrigerated storage. The whole amount of the yogurt after the measurement was put on the gauze covering the moisture receiving container, and stored in a refrigerator for 24 hours. After 24 hours, the weight of the naturally synergized water accumulated in the water receiving container was measured. The yogurt weight (V2 (g)) after 24 hours of refrigeration storage was calculated by subtracting the water weight from V1 (g). Based on the following formula, syneresis (%) was derived. It can be evaluated that the smaller the syneresis value, the better the syneresis suppressing property.
- Yoghurt (gel-like food) was prepared in the same manner as in Test Example 1 using protein glutaminase and/or laccase in the amounts shown in Table 3. During the preparation, the following measurements were carried out to evaluate the effects on quick-release effect and taste. Table 3 shows the results.
- Rapid brewing effect (1-1) Time until pH reaches 5 pH was measured over time from the time when the enzyme was added and culture was started, and the time until pH reached 5 was measured. . It can be evaluated that the shorter the time, the higher the fermentation efficiency (excellent quick-brewing effect).
- EPS exopolysaccharide 40 hours after the start of culture by adding the enzyme was measured by the following method.
- the yogurt after 40 hours was stirred, and the same volume of 40% by weight trichloroacetic acid aqueous solution was added and mixed.
- the resulting solution was centrifuged (2,200 g, 30 min, 4° C.) to remove cells and proteins.
- the supernatant was mixed with an equal volume of ethanol and stored at 4°C for 24 hours.
- the precipitate was collected by centrifugation (9,000 g, 30 minutes, 4° C.) and dissolved in distilled water.
- the total sugar content (EPS content) of this fraction was calculated by the phenol-sulfuric acid method. It can be evaluated that the higher the EPS amount, the higher the fermentation efficiency (excellent quick-brewing effect).
- Yogurt was prepared in the same manner as in Test Example 1, with the amount of laccase fixed and the amount of protein glutaminase varied, and the relative stress was derived. As a result, when 0.05 to 100 mU (amount per 1 g of milk protein) of protein glutaminase was used for 12 U (amount of 1 g of milk protein) of laccase, a remarkable effect of improving relative stress was observed. Furthermore, Table 4 shows specific relative stresses when 0.05 to 100 mU of protein glutaminase is used.
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Abstract
Description
項1. タンパク質材料を発酵する工程と、タンパク質脱アミド酵素及びマルチ銅オキシダーゼによる処理を行う工程とを含む、タンパク質発酵飲食品の製造方法。
項2. 前記タンパク質脱アミド酵素がプロテイングルタミナーゼである、項1に記載の製造方法。
項3. 前記マルチ銅オキシダーゼがラッカーゼである、項1又は2に記載の製造方法。項4. 前記タンパク質材料が牛乳である、項1~3のいずれかに記載の製造方法。
項5. 前記タンパク質発酵飲食品がヨーグルトである、項1~4のいずれかに記載の製造方法。
項6. タンパク質脱アミド酵素及びマルチ銅オキシダーゼを含む、タンパク質発酵飲食品の改質剤。
項7. タンパク質発酵飲食品の応力向上剤として用いられる、項6に記載の改質剤。
項8. タンパク質発酵飲食品の保水性向上剤として用いられる、項6に記載の改質剤。
項9. タンパク質発酵飲食品の離水抑制剤として用いられる、項6に記載の改質剤。
項10. タンパク質脱アミド酵素及びマルチ銅オキシダーゼを含む、タンパク質発酵飲食品製造における速醸剤。
本発明のタンパク質発酵飲食品の製造方法は、タンパク質材料を発酵する工程と、タンパク質脱アミド酵素及びマルチ銅オキシダーゼによる処理を行う工程とを含むことを特徴とする。これにより、得られるタンパク質発酵飲食品に関する諸特性を向上させることができる。以下、本発明のタンパク質発酵飲食品の製造方法について詳述する。
タンパク質材料としては、タンパク質を含み飲食品の素材となるものであれば特に限定されない。
タンパク質材料の発酵に用いる微生物としては、発酵飲食品を与えるものであれば特に限定されず、例えば、乳酸菌、ビフィズス菌、麹菌、酵母等が挙げられる。乳酸菌としては特に限定されず、例えば、ストレプトコッカス(Streptococcus)属乳酸菌、ラクトバチルス(Lactobacillus)属乳酸菌、ロイコノストック(Leuconostoc)属乳酸菌及びラクトコッカス(Lactococcus)属乳酸菌等が挙げられる。
本発明で用いられるタンパク質脱アミド酵素としては、ペプチド結合の切断及びタンパク質の架橋を伴わずタンパク質のアミド基含有側鎖を分解する作用を示す酵素であれば、その種類及び由来等は特に限定されない。タンパク質脱アミド酵素の例として、特開2000-50887号公報、特開2001-218590号公報、国際公開第2006/075772号に開示された、クリセオバクテリウム(Chryseobacterium)属、フラボバクテリウム(Flavobacterium)属、エンペドバクター(Empedobacter)属、スフィンゴバクテリウム(Sphingobacterium)属、アウレオバクテリウム(Aureobacterium)属又はミロイデス(Myroides)属由来のタンパク質脱アミド酵素、及びクリセオバクテリウム属由来のプロテイングルタミナーゼが挙げられる。これらのタンパク質脱アミド酵素としては、1種を単独で用いてもよいし、複数種を組み合わせて用いてもよい。
本発明で用いられるマルチ銅オキシダーゼとは、分子中に複数の銅原子を含有し、ポリフェノール、メトキシフェノール、ジアミン、ビリルビン、アスコルビン酸などを分子状酸素により酸化せしめる一群の酵素である。含まれる銅原子の数は、これまで知られているものは通常2~8個であるが、この数は分析時の酵素標品の状態、分析法によりばらつきが見られるため、特に限定されるものではない。マルチ銅オキシダーゼに分類される酵素としては、例えばラッカーゼ、ビリルビンオキシダーゼ、アスコルビン酸オキシダーゼ、セルロプラズミン等が挙げられる。
タンパク質材料を発酵する工程と、酵素(タンパク質脱アミド酵素及びマルチ銅オキシダーゼ)による処理を行う工程との順番は、任意である。つまり、発酵する工程及び酵素による処理を行う工程のいずれか一方を先に行い、当該一方の工程が完了した後、他方の工程を行ってもよいし、両方の工程を同時に行ってもよい。さらに、両方の工程を同時に行う場合、両方の工程の開始タイミングは同時であってもよいし、いずれか一方の工程の開始タイミングを早めてもよい。タンパク質発酵飲食品に関する諸特性向上効果をより一層高める観点から、発酵する工程及び酵素による処理を行う工程の両方を同時に行うことが好ましい。
タンパク質材料を発酵する工程における反応条件については、微生物の熱安定性、及び酵素による処理を行う工程を同時に行うか否か等を考慮して当業者が適宜選択することができるが、例えば、20~45℃、好ましくは25~30℃が挙げられる。発酵する工程に係る時間としては、目的のタンパク質発酵飲食品の種類及び発酵温度等に応じて当業者が適宜決定することができるが、例えば、1~80時間が挙げられる。さらに、発酵温度が20~30℃である場合、具体的な発酵時間としては、好ましくは20~60時間、より好ましくは40~50時間が挙げられ、発酵温度が30℃超~45℃以下、特に37~43℃の場合、具体的な発酵時間としては、好ましくは1~15時間、より好ましくは2~10時間、さらにより好ましくは3~8時間が挙げられる。酵素による処理を行う工程の開始に先立って行われる発酵する工程においては、微生物の増殖に伴って、タンパク質材料を適宜追加することができる。
本発明の製造方法により製造されるタンパク質発酵飲食品としては特に限定されない。タンパク質発酵飲食品の形態としては、固形状、ゲル状、液状等が挙げられる。また、タンパク質発酵飲食品の具体例としては、ヨーグルト(ゲル状食品の例)、飲むヨーグルト(飲料の例)、ヨーグルトペースト(ペースト状食品の例。食品素材としても用いられる。)、チーズ(固形状食品の例)等が挙げられる。
タンパク質脱アミド酵素及びマルチ銅オキシダーゼの組み合わせは、タンパク質発酵飲食品の製造に用いることで、発酵飲食品自体の、応力、保水性、又は離水抑制性といった諸特性を向上させる改質が可能となる。従って、本発明は、タンパク質脱アミド酵素及びマルチ銅オキシダーゼを含む、タンパク質発酵飲食品の改質剤も提供する。
タンパク質脱アミド酵素及びマルチ銅オキシダーゼの組み合わせは、タンパク質発酵飲食品の製造に用いることで、製造時の発酵効率を向上する(つまり速醸する)ことができる。従って、本発明は、タンパク質脱アミド酵素及びマルチ銅オキシダーゼを含む、タンパク質発酵飲食品製造における速醸剤も提供する。
(2-1)タンパク質脱アミド酵素活性値測定方法
タンパク質脱アミド酵素の酵素活性測定は、N-ベンジルオキシカルボニル-L-グルタミニルグリシン(Z-Gln-Gly;ペプチド研究所)を基質として以下に記載する方法で行った。
マルチ銅オキシダーゼの酵素活性測定は、2,2’-Azino-di-[3-ethylbenzthiazoline sulfonate](ABTS、ベーリンガー・マンハイム社製)を基質として以下に記載する方法で行った。
牛乳5mLに乳酸菌(種菌)を接種し、28℃で4時間前培養を行った。これにより得られた培養物1mLを新しい牛乳49mLに加え混合し、さらに、プロテイングルタミナーゼ及び/又はラッカーゼを表2に示す量加えて混合した。28℃で48時間静置し、その後冷蔵庫で2~4時間静置し(離水抑制性の試験に供する場合のみ、静置条件は下記(4-3)に示す条件とした。)た。つまり、本試験例では発酵工程と酵素処理工程とを同時に行った。これによって、ヨーグルト(ゲル状食品)を得た。
得られたヨーグルトについて、以下の各種特性を試験した。結果を表2に示す。
レオメーター(株式会社サン科学社製)を用い、得られたヨーグルトの応力を測定した。比較例1のヨーグルトの応力を100%とした場合の相対応力(%)を導出した。相対応力の値が大きいほど、応力が向上していると評価できる。
得られたヨーグルトの重量を測定し、その後、1000×g、10分、20℃の条件で遠心し、上清を回収して、残りのヨーグルトの重量を測定した。以下の式に基づいて、保水力(%)を導出した。保水力の値が大きいほど、保水性が向上していると評価できる。
冷蔵保存前にヨーグルトの重量(V1(g))を測定した。測定後のヨーグルトを水分受け容器に被せたガーゼ上に全量乗せ、24時間冷蔵保存した。24時間後、水分受け容器に溜まった自然離水した水分の重量を測定した。V1(g)から水分重量を引くことで冷蔵保存24時間後のヨーグルト重量(V2(g))を算出した。以下の式に基づいて、離水性(%)を導出した。離水性の値が小さいほど、離水抑制性が向上していると評価できる。
プロテイングルタミナーゼ及び/又はラッカーゼを表3に示す量で用い、試験例1と同じ手順でヨーグルト(ゲル状食品)を調製した。調製中、以下の測定を行い、速譲効果と呈味に与える影響とを評価した。結果を表3に示す。
(1-1)pHが5に到達するまでの時間
酵素を加えて培養を開始した時点からpHを経時的に測定し、pHが5に到達するまでの時間を測定した。当該時間が短いほど、発酵効率が高い(速醸効果に優れている)と評価できる。
酵素を加えて培養を開始した時点から40時間後におけるEPS(エキソポリサッカライド)量を、次の方法で測定した。当該40時間後のヨーグルトを攪拌し、同体積量の40重量%トリクロロ酢酸水溶液を添加し、混合した。細胞およびタンパク質を除去するため、得られた溶液を遠心分離(2,200g、30分、4℃)した。さらに、オリゴ糖及び低分子糖を除去するため、上清を同体積量のエタノールと混合し、24時間、4℃で保管した。遠心分離(9,000g、30分、4℃)した沈殿を回収し、蒸留水に溶解した。この画分をフェノール硫酸法にて全糖量(EPS量)を算出した。EPS量が多いほど、発酵効率が高い(速醸効果に優れている)と評価できる。
調製中、酵素を加えて培養を開始した時点から40時間後における乳酸量をLactate Assay Kit-WST(同仁化学研究所)を用いて測定した。比較例4に比べて乳酸量の増加が抑えられていると、過度な酸味による呈味への悪影響が無いと評価できる。
ラッカーゼの量を固定し、プロテイングルタミナーゼの量を変動させて、試験例1と同様にしてヨーグルトを調製し、相対応力を導出した。その結果、ラッカーゼ12U(乳タンパク質1g当たり量)に対してプロテイングルタミナーゼを0.05~100mU(乳タンパク質1g当たり量)用いた場合に、顕著な相対応力向上効果が認められた。さらに、プロテイングルタミナーゼを0.05~100mU用いた場合の具体的な相対応力を表4に示す。
Claims (10)
- タンパク質材料を発酵する工程と、タンパク質脱アミド酵素及びマルチ銅オキシダーゼによる処理を行う工程とを含む、タンパク質発酵飲食品の製造方法。
- 前記タンパク質脱アミド酵素がプロテイングルタミナーゼである、請求項1に記載の製造方法。
- 前記マルチ銅オキシダーゼがラッカーゼである、請求項1に記載の製造方法。
- 前記タンパク質材料が牛乳である、請求項1に記載の製造方法。
- 前記タンパク質発酵飲食品がヨーグルトである、請求項1に記載の製造方法。
- タンパク質脱アミド酵素及びマルチ銅オキシダーゼを含む、タンパク質発酵飲食品の改質剤。
- タンパク質発酵飲食品の応力向上剤として用いられる、請求項6に記載の改質剤。
- タンパク質発酵飲食品の保水性向上剤として用いられる、請求項6に記載の改質剤。
- タンパク質発酵飲食品の離水抑制剤として用いられる、請求項6に記載の改質剤。
- タンパク質脱アミド酵素及びマルチ銅オキシダーゼを含む、タンパク質発酵飲食品製造における速醸剤。
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