WO2013137442A1 - 餅麹の製造方法 - Google Patents
餅麹の製造方法 Download PDFInfo
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- WO2013137442A1 WO2013137442A1 PCT/JP2013/057429 JP2013057429W WO2013137442A1 WO 2013137442 A1 WO2013137442 A1 WO 2013137442A1 JP 2013057429 W JP2013057429 W JP 2013057429W WO 2013137442 A1 WO2013137442 A1 WO 2013137442A1
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- koji
- molded product
- producing
- mochi
- during
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12G—WINE; PREPARATION THEREOF; ALCOHOLIC BEVERAGES; PREPARATION OF ALCOHOLIC BEVERAGES NOT PROVIDED FOR IN SUBCLASSES C12C OR C12H
- C12G3/00—Preparation of other alcoholic beverages
- C12G3/02—Preparation of other alcoholic beverages by fermentation
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12G—WINE; PREPARATION THEREOF; ALCOHOLIC BEVERAGES; PREPARATION OF ALCOHOLIC BEVERAGES NOT PROVIDED FOR IN SUBCLASSES C12C OR C12H
- C12G3/00—Preparation of other alcoholic beverages
- C12G3/02—Preparation of other alcoholic beverages by fermentation
- C12G3/021—Preparation of other alcoholic beverages by fermentation of botanical family Poaceae, e.g. wheat, millet, sorghum, barley, rye, or corn
- C12G3/022—Preparation of other alcoholic beverages by fermentation of botanical family Poaceae, e.g. wheat, millet, sorghum, barley, rye, or corn of botanical genus Oryza, e.g. rice
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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
- A23L7/00—Cereal-derived products; Malt products; Preparation or treatment thereof
- A23L7/10—Cereal-derived products
- A23L7/104—Fermentation of farinaceous cereal or cereal material; Addition of enzymes or microorganisms
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12H—PASTEURISATION, STERILISATION, PRESERVATION, PURIFICATION, CLARIFICATION OR AGEING OF ALCOHOLIC BEVERAGES; METHODS FOR ALTERING THE ALCOHOL CONTENT OF FERMENTED SOLUTIONS OR ALCOHOLIC BEVERAGES
- C12H1/00—Pasteurisation, sterilisation, preservation, purification, clarification, or ageing of alcoholic beverages
- C12H1/02—Pasteurisation, sterilisation, preservation, purification, clarification, or ageing of alcoholic beverages combined with removal of precipitate or added materials, e.g. adsorption material
- C12H1/06—Precipitation by physical means, e.g. by irradiation, vibrations
- C12H1/063—Separation by filtration
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12H—PASTEURISATION, STERILISATION, PRESERVATION, PURIFICATION, CLARIFICATION OR AGEING OF ALCOHOLIC BEVERAGES; METHODS FOR ALTERING THE ALCOHOL CONTENT OF FERMENTED SOLUTIONS OR ALCOHOLIC BEVERAGES
- C12H1/00—Pasteurisation, sterilisation, preservation, purification, clarification, or ageing of alcoholic beverages
- C12H1/22—Ageing or ripening by storing, e.g. lagering of beer
Definitions
- the present invention relates to a method for manufacturing straw. More specifically, the present invention relates to a production method for preventing generation of a blue odor in a cocoon obtained by molding uncooked cereals and breeding microorganisms such as mold and yeast.
- fermented foods are widely manufactured using cereals obtained by breeding microorganisms such as molds in cereals and cereals obtained at the time of grain refining.
- breeding microorganisms such as molds in cereals and cereals obtained at the time of grain refining.
- the function as a flavor raw material which gives the flavor like a liquor by supplying to is mentioned.
- Koji is roughly classified into two types, “Koji” and “Machi Koji”, depending on the manufacturing method and its form.
- the representatives of scatter are Japanese sake and shochu. Since the grains of steamed rice and wheat grains are heat-denatured by heating, they have high acid carboxypeptidase activity and can use the heat-denatured protein. Aspergillus oryzae and Aspergillus kawachi (Aspergillus kawachii) and other gonococci are selectively propagated.
- a rice cake is made by roughly crushing uncooked cereals into powder, adding water or grass root bark leachate, and forming it into bricks, dumplings, or rice crackers, and propagating microorganisms such as mold and yeast.
- fungi such as Rhizopus genus and Mucor genus that have low fermentative ability but low acid carboxypeptidase activity are dominant.
- the molded cereals are allowed to stand in a warm place and the microorganisms propagate naturally, so that not only the above-mentioned mold but also various fungi derived from raw materials and the natural environment propagate.
- microflora composed of various microorganisms that cannot be compared with that of miracle, and sake made from koji is complex and deep depending on the metabolites and compounds produced by those microorganisms. It will have a unique flavor.
- the function of strawberry as a flavor raw material that determines the individuality of sake is extremely important compared to its function as a saccharification starter.
- sake using koji as a raw material is characterized by a unique and complex flavor, but some Japanese experts have a bluish smell (hereinafter also called “blue odor”). Some point out that this is felt.
- the blue odor may be pronounced of mold for the Japanese, and even a slight amount tends to be avoided. For this reason, in Japan, it is considered to be very important to develop a manufacturing technology for koji with reduced blue odor in order to increase the acceptability of sake using koji.
- the present invention has a complex and deep flavor inherent to sake made from koji, but does not have a blue odor and koji and koji made from koji, and its It is an object to provide a manufacturing method.
- the present inventors have found that one of the main causative substances of the blue odor of sputum is geosmin and that diosmin is produced by actinomycetes in sputum.
- various microbial flora inherent in the cocoon can be obtained. It was found that the growth of actinomycetes can be suppressed while maintaining the above, and the blue odor can be reduced without impairing the unique and complex flavor of the cocoon, and the present invention has been completed.
- the present invention provides the following method for producing koji, and alcoholic beverages produced by adding such koji. That is, the present invention (1) forms a molded product from a crushed or powdered product of uncooked cereal and water or a plant water extract; (2) Aging is performed by propagating microorganisms in the molded product; In the manufacturing method of the koji comprising the steps, Maintaining the pH of the molded product in the range of 2.0 to 5.5 during the aging period, I will provide a.
- the pH is preferably adjusted by including an organic acid in the molded product.
- Lactic acid can be used as the organic acid, and lactic acid bacteria can be grown on the molded product and produced by lactic acid fermentation.
- the present invention also provides (1) forming a molded product from a crushed or powdered product of uncooked cereal and water or a plant water extract; (2) Aging is performed by propagating microorganisms in the molded product;
- a method for producing koji characterized in that the pH of the molded product is always aged at a temperature of 10 to 25 ° C. over 5.5 during the aging period, I will provide a.
- the present invention also provides soot having a diosmin content of 7 ⁇ g or less per 1 kg of soot obtained by the above production method.
- the present invention also relates to an alcoholic beverage produced using the above-mentioned jar.
- the present invention it is possible to maintain a variety of microbial flora inherent in cocoons while suppressing the growth of actinomycetes, which generates aroma components that cause blue odor of cocoons. Accordingly, it is possible to produce a koji that has a complex flavor inherent to koji and has a reduced blue odor, and can provide high quality liquors that are easily accepted by the Japanese.
- uncooked cereals are roughly crushed into a powder form, added with water or a vegetable water extract, and formed into a brick shape, dumpling shape or rice cracker shape, etc.
- a thing that has been propagated with microorganisms such as mold and yeast.
- a plant extract a leachate obtained by extracting grass root bark with water can be used.
- Uncooked refers to not heating raw cereal grains with steam.
- the cereal may be any raw material that is usually used in brewing, and specifically includes cereals such as rice, wheat, rice bran, rice bran, rice bran, and high koji, or rice obtained when whitening cereals. It is done.
- a specific microorganism may be inoculated into the molded product, or the molded product may be allowed to stand in an appropriate place to naturally propagate the microorganisms.
- the period after the molded article is inoculated with microorganisms or left in an appropriate place to propagate the microorganisms to complete the cocoon is referred to as an aging period in this specification.
- the object of the present invention can be achieved by appropriately controlling at least one of the conditions (1) pH and (2) storage temperature of the molded product during the aging period. This condition will be described in detail.
- the present invention is used when adjusting the pH so as to maintain the pH of the molded product during the aging period within the range of 2.0 to 5.5.
- the second condition: the storage temperature of the molded product during the aging period, can be used to produce a koji with a suppressed blue odor.
- a pH adjustment method for maintaining the molded product in the above-mentioned pH range a method for predicting a pH change during the aging period by preliminary experiments and adjusting the molded product at the start of aging to a predetermined pH in advance and / or There are two methods, a method of appropriately measuring the pH of the koji during the aging period and adjusting it to the above pH range, and performing the two methods as necessary to adjust the pH of the molded product during the aging period. Can be maintained within a specific range.
- the pH of the molded product In order to measure the pH of the molded product, an appropriate amount of several portions of the entire molded product are collected, diluted with water, and the pH of the extract is measured.
- the measurement sample is collected so as to include at least one central portion and two outer peripheral portions of the molded product. 20 g of the collected soot is pulverized to a particle size of about 10 mm, 100 ml of pure water is added, and leached for 3 hours with occasional shaking at room temperature.
- the leachate is filtered through filter paper, and 10 ml of the filtrate is taken for pH measurement.
- a pH measurement method a known method can be used. For example, the pH is measured using a pH meter (JIS Z 8805 pH measurement glass electrode) according to the JIS Z 8802 pH measurement method.
- the purpose of inhibiting the growth of actinomycetes can be achieved by adjusting the pH so that the molded product is maintained in the above pH range (2.0 to 5.5), but it can grow microorganisms such as mold that are necessary for the production of good koji. From the point of view of the above, it is desirable to adjust the pH so that it is preferably maintained at 3.0 to 5.0, more preferably 4.0 to 5.0.
- the pH of the molded product is higher than the above pH range, the pH is adjusted by lowering the pH.
- the means for lowering the pH is not particularly limited, and known means can be used.
- One specific means is to include a liquid containing an organic acid in the molded product.
- the organic acid can be used without any limitation as long as it can be added to food. Specific examples include lactic acid, citric acid, malic acid, tartaric acid, and the like.
- these organic acids those commercially available as food additives may be used, or juices or leachates of food materials containing organic acids may be used.
- the culture solution of microorganisms which produce organic acid fermentation or an organic acid can also be used.
- lactic acid bacteria may be cultured and lactic acid secreted by lactic acid bacteria may be used. It is possible to inoculate lactic acid bacteria into a molded product and grow it in the molded product, and the pH can be adjusted by secreted lactic acid. It is possible to adjust the pH by adding it.
- the genus species, inoculation amount, culture conditions, and the like of the lactic acid bacteria used here can be appropriately set so as to achieve the purpose of pH adjustment.
- the storage temperature of the molded product should be By controlling at 10 to 25 ° C., it is possible to produce koji with a suppressed blue odor.
- the temperature here refers to the temperature of the atmosphere of the environment where the molded product is placed during the aging period. Below 10 ° C., the growth rate of useful microorganisms such as fungi also decreases, which adversely affects productivity. Exceeding 25 ° C. is not preferable because the risk of growth of actinomycetes increases.
- the end point of the maturation period of the molded product is not particularly limited, and can be determined within a range in which it is determined that the target quality has been reached and no blue odor due to actinomycetes is observed.
- the absence of blue odor due to actinomycetes means that the molded product was subjected to sensory evaluation by a plurality of trained panelists and it was concluded that no blue odor was observed. It can also be defined as content.
- the content of diosmin per 1 kg of cocoon is 7 ⁇ g or less, no blue odor is observed from the sake produced using the cocoon of the present invention, and when the content is 5 ⁇ g or less, the blue odor is further reduced.
- the amount is 3 ⁇ g or less, the blue odor is further reduced, which is further preferable.
- the diosmin content of salmon is measured as follows.
- ⁇ Pre-treatment method for rice cake> First, in order to prevent scattering of aroma components, the sample candy is crushed in a state sealed in a plastic bag or the like to obtain a uniform powder. Next, 10 g of this pulverized soot is measured, 50 g of ion exchange water is added, and steam distillation is performed, and 200 ml of the distillate is collected. This distillate is subjected to gas chromatography (GC) analysis under the following conditions.
- GC gas chromatography
- CIS temperature Hold at -120 ° C for 0.01 minute, then heat up at 12 ° C / s and hold at 250 ° C for 10 minutes.
- Transfer line 250 °C
- Desorption flow rate 50ml / min (helium)
- Injection mode Solvent vent (purge time 2.0 minutes)
- Alcoholic beverages using koji can be used for brewing as a raw material for sake.
- the type of the target sake is not limited at all. Since the generation of blue odor as a koji is sufficiently suppressed, no odor is observed in sake obtained as a result of brewing, and the quality matches the taste of the Japanese.
- inoculum solution Among the strains isolated from Nuruk which is a kind of Korean moth, actinomycetes (Streptomyces genus and Saccharopolyspora genus) as causative bacteria of blue odor ), And fungi (genus Mucor and Rhizomucor) as microorganisms contributing to saccharification and flavoring in brewing.
- Actinomycetes are obtained using a YS agar medium (yeast extract 0.2%, soluble starch 1%, agar 1.5%, pH 7.0) at 35 ° C., and mold is produced using a potato dextrose agar medium (manufactured by Nissui Pharmaceutical). Each was cultured at 0 ° C. The detected colonies were collected with a platinum loop and suspended in physiological saline to obtain an inoculum.
- YS agar medium (0.2% yeast extract, 1% soluble starch, 1.5% agar) was used for actinomycetes, and potato dextrose agar medium (manufactured by Nissui Pharmaceutical) was used for mold. After sterilization by autoclaving, the pH of the medium was adjusted by adding hydrochloric acid while warming the medium to such an extent that the agar did not harden, thereby preparing eight levels (pH 2.0 to 7.0) of the medium.
- the inoculum prepared in the growth test was streaked on the medium with platinum loops and cultured in a thermostat for 14 days at a culture temperature of 7 levels (10 to 35 ° C.).
- the larger the AB value the less blue odor is produced during the ripening period of the cocoon, while the smaller the AB value, the more blue odor is generated before the ripening is completed. It is conceivable that. From the above, it is considered that a large AB value suppresses blue odor and is an advantageous condition for the production of koji with good flavor quality. Therefore, the effectiveness of each condition can be determined in four stages from the AB value. It was evaluated with. When the value of AB was 10 or more, +++ was obtained when it was 4-9, + when it was 2 or 3, and 1 when it was 1.
- the A value is 2 at 30 ° C., pH 6.0 to 7.0, but is 3 at pH 5.5, 6 at pH 5.0, 14 at pH 4.5, and at pH 4.0 during the 14-day culture period. Neither colony nor blue odor was observed. Therefore, it was suggested that the sensitivity to pH is very high. In addition, it was 2 at a culture temperature of 28 ° C. or higher, but 4 at 25 ° C. and 11 at 20 ° C., indicating that the sensitivity to temperature was high, and the growth was decreased at 25 ° C. or less, particularly 20 ° C. or less. .
- a koji mold having a good quality with no blue odor can be produced regardless of the culture temperature by adjusting the koji mold to pH 5.5 or less.
- the pH is adjusted to 5.0 or less because actinomycetes are more difficult to grow, and if the pH is adjusted to 4.5 or less, actinomycetes are more difficult to grow.
- Even if the pH exceeds 5.5, controlling the culture temperature to 25 ° C or lower can suppress the growth rate of actinomycetes to be sufficiently lower than the growth rate of fungi, so that the quality of the cocoon does not show blue odor.
- a cocoon can be produced and is preferred.
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Abstract
Description
醸造における麹の機能は主に二つあり、アミラーゼ等の酵素類によって穀類中のでんぷんを糖化し、アルコール発酵を行う酵母に糖質を供給する発酵スターターとしての機能と、代謝産物を醸造した酒に供給して酒らしい香味を付与する香味原料としての機能が挙げられる。
散麹の代表は、日本の清酒や焼酎である。蒸煮した米や麦等の穀類の粒は、加熱によってタンパク質が熱変性しているため、酸性カルボキシペプチダーゼ活性が高く熱変性したタンパク質を利用することができるアスペルギルス・オリゼ(Aspergillus oryzae)やアスペルギルス・カワチ(Aspergillus kawachii)等の麹菌が選択的に繁殖することが特徴となっている。
すなわち、本発明は、(1)無蒸煮の穀類の破砕物又は粉状物と、水又は植物性水抽出物とから成形物を形成し;
(2)前記成形物において微生物を繁殖させることにより熟成を行う;
工程を含んで成る餅麹の製造方法において、
前記成形物のpHを、熟成期間中に2.0~5.5の範囲を維持することを特徴とする、餅麹の製造方法、
を提供する。
(1)無蒸煮の穀類の破砕物又は粉状物と、水又は植物性水抽出物とから成形物を形成し;
(2)前記成形物において微生物を繁殖させることにより熟成を行う;
工程を含んで成る餅麹の製造方法において、
前記成形物のpHが、熟成期間中に常に5.5を超え、かつ10~25℃の温度で熟成させることを特徴とする、餅麹の製造方法、
を提供する。
本発明はまた、上記の餅麹を使用して製造される酒類に関する。
本発明でいう餅麹とは、無蒸煮の穀類を粗く砕いて粉状とし、水又は植物性水抽出物を加えて、煉瓦状、団子状あるいは煎餅状等の形状に成形して成形物となし、カビや酵母等の微生物を繁殖させたものをいう。植物性抽出物として草根木皮を水で抽出した浸出液を用いることができる。
穀類とは、醸造において通常用いられるものであればいかなる原料でもよく、具体的には米、小麦、粟、稗、黍、高粱等の穀類、又は穀類を精白する際に得られる糠等が挙げられる。
成形後の成形物を、微生物の接種ないしは適当な場所に放置して、微生物を繁殖させて餅麹を完成させるまでの期間を、本明細書では熟成期間という。
本発明の目的は、熟成期間中の成形物の(1)pHと(2)保管温度の少なくとも一方の条件を、適切に管理することによって達せられる。
本条件について詳述する。
本発明は、熟成期間中の成形物のpHを2.0~5.5の範囲に維持するようpH調整する場合は、第二の条件:熟成期間中の成形物の保管温度、に限定されることなく、青臭が抑制された餅麹を製造することができる。成形物を前記のpH範囲に維持するためのpH調整の方法としては、予備実験によって熟成期間中のpH変化を予測し、あらかじめ熟成開始時の成形物を所定pHに調整する方法、及び/又は熟成期間中の餅麹のpHを適宜測定し、前記pH範囲に調整する方法、の二つの方法が挙げられ、これら二つの方法を必要に応じて実施することによって熟成期間中の成形物のpHを特定範囲に維持することができる。
pHの測定方法としては公知の方法を用いることができ、例えば、JIS Z 8802 pH測定方法に従って、pHメーター(JIS Z 8805 pH測定用ガラス電極)を用いて測定する。
熟成期間中の成形物のpHが常に5.5を超え、かつpH調整を行わない場合は、成形物の保管温度を10~25℃に管理することによって、青臭が抑制された餅麹を製造することができる。ここでいう温度とは、熟成期間中に成形物が置かれている環境の雰囲気の温度をいう。10℃を下回ると、カビ等の有用な微生物の増殖速度も低下し、生産性に悪影響を及ぼすため好ましくない。25℃を超えると、放線菌が増殖するリスクが高まるため好ましくない。
まず、試料の餅麹を、香気成分の飛散を防止するため、ビニール袋などに密封した状態で粉砕して均一な粉とする。次にこの粉砕餅麹10gを計り取り、イオン交換水50gを加えて水蒸気蒸留し、その留液200 mlを採取する。この留液について、次の条件にてガスクロマトグラフィ(GC)分析を行う。
装置:Gerstel TDS3-Agilent 689ON GC/5975 MS
カラム:HP-INNOWAX 30m, 0.25mm, 0.50μm
検出器:MSD
TDS3温度:20℃にて1.0分間保持した後、60℃/minにて昇温し、250℃にて10分間保持する。
トランスファーライン:250℃
脱着流量:50ml/min(ヘリウム)
注入モード:ソルベントベント(パージ時間2.0分間)
カラム流量:定流量1.0 ml/min
イオン源温度:230℃
測定モード:SIM
測定フラグメントイオン:M/Z=112
検量線:標準添加法(2点)
<餅麹の前処理方法>にて得られた留液の分析値y(μg/kg-餅麹)とすると、試料餅麹中のジオスミン濃度x(μg/kg-餅麹)は以下の式によって求めることができる。
x=y×0.2×1000/10=20y
熟成期間を経た餅麹はそのまま醸造原料に用いることもできるし、利便性のために適当な大きさに粉砕して用いることもできる。
本発明の餅麹は、酒の原料として醸造に供することができる。目的とする酒の種類は何ら限定されない。餅麹として青臭の生成が十分抑制されているので、醸造の結果得られた酒にも青臭が認められず、日本人の嗜好に合致した品質となる。
韓国の餅麹の一種であるヌルック(Nuruk)より単離した菌株の中から、青臭の原因菌として放線菌(ストレプトマイセス(Streptomyces)属及びサッカロポリスポラ(Saccharopolyspora)属)を、そして醸造における糖化と香味付与に寄与する微生物として、カビ(ムコール(Mucor)属及びリゾムコール(Rhizomucor)属)を供した。放線菌はYS寒天培地(酵母エキス0.2%、可溶性デンプン1%、寒天1.5%、pH7.0)を用いて35℃で、そしてカビはポテトデキストロース寒天培地(日水製薬社製)を用いて28℃でそれぞれ培養した。検出されたコロニーを白金耳にて採取して生理食塩水に懸濁し、植菌液とした。
培地として、放線菌にはYS寒天培地(酵母エキス0.2%、可溶性デンプン1%、寒天1.5%)を、カビにはポテトデキストロース寒天培地(日水製薬社製)を使用した。オートクレーブによる殺菌後、寒天が固まらない程度に培地を温めながら、塩酸を添加することで培地のpHを調整し、8水準(pH 2.0~7.0)の培地を作製した。
作製した植菌液を白金耳で培地上に画線し、それぞれ7水準(10~35 ℃)の培養温度で恒温器にて14日間培養した。
培養開始後1日ごとに、放線菌のコロニー形成及び青臭の生成、並びにカビのコロニー形成を確認し、それぞれの培養開始日からの日数をA及びBとした。餅麹で検出されるカビは極めて早く生育し、放線菌の生育速度より早いため、常にA>Bであるが、培地pHと培養温度条件によってA-Bの値は変動した。A-Bの値が大きいほど、すなわちカビの生育が早く、放線菌の生育が遅いほど、餅麹における糖化力の向上と複雑な香味の形成が早く、青臭生成が遅いと考えられ、A-Bの値が小さいほど、すなわちカビの生育が遅く、放線菌の生育が早いほど、餅麹における糖化力の向上と複雑な香味の形成が遅く、青臭生成が早いと考えられる。
B値に関しては、30℃培養、pH 4.0~7.0の範囲では常に1であり、pHに対する感受性が低いことが示唆された。また、28℃以上の培養温度では1であるが、25℃以下では2となり、温度に対する感受性も低いと考えられるものの、25℃以下でやや増殖性が低下することが示唆された。
Claims (7)
- (1)無蒸煮の穀類の破砕物又は粉状物と、水又は植物性水抽出物とから成形物を形成し;
(2)前記成形物において微生物を繁殖させることにより熟成を行う;
工程を含んで成る餅麹の製造方法において、
前記成形物のpHを、熟成期間中に2.0~5.5の範囲を維持することを特徴とする、餅麹の製造方法。 - 前記成形物に有機酸を含ませることによってpH調整を行う、請求項1に記載の餅麹の製造方法。
- 前記有機酸が乳酸である、請求項2に記載の餅麹の製造方法。
- 前記乳酸を、前記成形物における乳酸発酵により生成させる、請求項2に記載の餅麹の製造方法。
- (1)無蒸煮の穀類の破砕物又は粉状物と、水又は植物性水抽出物とから成形物を形成し;
(2)前記成形物において微生物を繁殖させることにより熟成を行う;
工程を含んで成る餅麹の製造方法において、
前記成形物のpHが、熟成期間中に常に5.5を超え、かつ10~25℃の温度で熟成させることを特徴とする、餅麹の製造方法。 - 請求項1~5のいずれか1項に記載の製造方法によって得られる、ジオスミン含有量が餅麹1kgあたり7μg以下である餅麹。
- 請求項6に記載の餅麹を使用して製造される酒類。
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