WO2009103205A1 - 含有肌苷酸二钠盐和鸟苷酸二钠盐的酵母抽提物及其制备方法 - Google Patents

含有肌苷酸二钠盐和鸟苷酸二钠盐的酵母抽提物及其制备方法 Download PDF

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WO2009103205A1
WO2009103205A1 PCT/CN2008/072153 CN2008072153W WO2009103205A1 WO 2009103205 A1 WO2009103205 A1 WO 2009103205A1 CN 2008072153 W CN2008072153 W CN 2008072153W WO 2009103205 A1 WO2009103205 A1 WO 2009103205A1
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Prior art keywords
yeast
disodium
salt
yeast extract
supernatant
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PCT/CN2008/072153
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English (en)
French (fr)
Inventor
俞学锋
李知洪
余明华
姚鹃
李沛
李库
唐冠群
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安琪酵母股份有限公司
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Application filed by 安琪酵母股份有限公司 filed Critical 安琪酵母股份有限公司
Priority to JP2010546198A priority Critical patent/JP5175941B2/ja
Priority to KR1020107018402A priority patent/KR101295970B1/ko
Priority to EP08784142.5A priority patent/EP2255679B1/en
Publication of WO2009103205A1 publication Critical patent/WO2009103205A1/zh
Priority to US12/854,194 priority patent/US20100303960A1/en
Priority to US13/540,600 priority patent/US20120269926A1/en

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    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12PFERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P21/00Preparation of peptides or proteins
    • C12P21/06Preparation of peptides or proteins produced by the hydrolysis of a peptide bond, e.g. hydrolysate products
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, 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
    • A23L27/00Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
    • A23L27/20Synthetic spices, flavouring agents or condiments
    • A23L27/23Synthetic spices, flavouring agents or condiments containing nucleotides
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, 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
    • A23L31/00Edible extracts or preparations of fungi; Preparation or treatment thereof
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, 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
    • A23L31/00Edible extracts or preparations of fungi; Preparation or treatment thereof
    • A23L31/10Yeasts or derivatives thereof
    • A23L31/15Extracts
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, 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
    • A23L33/00Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
    • A23L33/10Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
    • A23L33/14Yeasts or derivatives thereof
    • A23L33/145Extracts

Definitions

  • the present invention relates to a preparation of 4-30% of a disulphonic acid disodium salt and a guanylate disodium salt (I+G, wherein I represents a polygluconate disodium salt)
  • I represents a polygluconate disodium salt
  • BACKGROUND OF THE INVENTION Yeast extracts are obtained by degrading proteins in yeast cells into amino acids and polypeptides, degrading nucleic acids into nucleotides, and combining them with other active ingredients such as B vitamins, glutathione, and amount of elements. Extracted from yeast cells, the resulting human body can directly absorb the use of soluble, soluble nutrients and flavor concentrates. In recent years, with the improvement of people's living standards, people have put forward new requirements for the content of food. Various foods are increasingly developing in the direction of natural, convenient, delicious and multifunctional. Food seasonings have also been brewed from previous uses.
  • Yeast extract contains amino acids and peptides, and also contains various active ingredients such as nucleotides, vitamins, organic acids and minerals. It is delicious and rich in flavour and has a meaty aroma. It is an excellent food seasoning that combines the three functions of nutrition, seasoning and health care, and is increasingly popular among consumers.
  • the global market demand for yeast extract is estimated at $1.5 billion.
  • yeast extracts are widely used in the catering industry to adjust the desired flavor, acidity, chew and so on. In its case of application, it also has an effect on the taste of peppers and meat, which may create opportunities to reduce ingredient costs or enhance flavor. Recent advances in biotechnology have significantly expanded their applications. The latest generation of yeast extract is rich in glutamic acid and nucleosides, which further enhances its flavor enhancement properties. Together with the originally present amino acids and polypeptides, it can significantly reduce the sodium salt content without loss of the original flavor.
  • the pretreatment of the sugar-removing yeast with fermented active dry yeast fermentation and glucose oxidase has a significant protective effect on the color of the autolyzed yeast liquid, and a pale yellow self-solution can be obtained.
  • the pre-fermentation treatment had a significant effect on the flavor of the autolyzed yeast liquor, the extract was chicken flavor, and the amino acid nitrogen content was 5.12% by weight (based on dry yeast).
  • a yeast extract product having an ultra-low salt content a light color and a meaty type can be obtained.
  • a technique for double-enzymatic degradation of nucleic acids to produce taste nucleotides I+G is also known (Sugar Cane Industry No.
  • RNA yeast nucleic acid
  • I 5,-inosinate
  • R 5,- Bird sodium glucoside
  • G 5,-GMP.Na 2 .7H 2 O
  • a yeast extract having a high 5'-ribonucleotide content and its preparation are also known (Chinese Patent Application No. 200510124942.1).
  • This application provides a yeast extract having a higher 5,-ribonucleotide and amino acid content than before. And its preparation method. Treat the edible yeast with an acidic aqueous solution, centrifuge and separate After the precipitate is washed with water, it is contacted with an enzyme produced by actinomycetes, thereby preparing a total of 5,-inosinic acid and 5,-guanylic acid in a total of at least 24% by weight, a peptide of at least 20% by weight, and a peptide and a free amino acid.
  • a yeast extract having a high content of at least 28 wt ° / 5 '-ribonucleotide is added.
  • Ordinary yeast extract contains a large amount of protein and amino acids, and has a rich taste, but contains a small amount of disodium nucleotides and is not strong enough.
  • the pure taste of nucleotide disodium is relatively expensive, and if used alone, the taste is not too mellow, the umami taste is not strong, and it must be mixed with cynic acid to produce umami.
  • the disodium nucleotide is added as a food additive, and the product label must be marked with an additive, so that the product does not have the characteristics of being purely natural and containing no additives.
  • the invention provides a method of preparing a yeast extract comprising 4-30% I+G (dosage monosodium salt and guanylate disodium salt), the method comprising:
  • the supernatant after enzymatic hydrolysis is inactivated by heat treatment at 50-70 minutes, 75-90 °C; f) the supernatant of the enzyme-inactivated solution is concentrated to 35-40 wt%, and the obtained dry matter is spray-dried to obtain a higher content of the yeast extract of the disulphonate disodium salt and the guanylate disodium salt; the total content of the monosodium glutamate disodium salt and the guanylate disodium salt in the final yeast extract is 4-30% .
  • the method according to the invention characterized in that the ratio between the enzymes added in step (d) is
  • the enzyme added in the step (d) accounts for 0.1 to 0.3% by weight of the dry matter in the supernatant.
  • the added enzyme preferably works optimally at a temperature of 45 to 68 degrees Celsius.
  • the pH is controlled in the range of 4.5 to 6.8.
  • the action time is controlled to be 16-20 hours.
  • a yeast extract containing a disulphonate disodium salt and a guanylate disodium salt obtained according to the method of the present invention.
  • the yeast extract according to the present invention has a more delicious mouthfeel; and the ability of the yeast extract to enhance the umami taste of the food is stronger. Since the taste is a subjective evaluation of human beings, there is no uniform international standard for quantification. See Figure 2, which shows that the high-yield yeast extract can last for a long time. Although the umami taste can be increased by directly adding the nucleotide to the ordinary yeast extract, there is a natural problem.
  • FIG. 1 is a process flow diagram of an embodiment of the present invention.
  • Figure 2 is a graph of mouthfeel strength versus time for different materials.
  • RNA ribonucleic acid
  • the added enzyme acts at a temperature of 45 to 68 degrees Celsius.
  • Spray drying protocol The supernatant is concentrated to a dry matter content of about 30% and spray dried to obtain a high I+G content (4-30%) yeast extract.
  • yeast yeast having a ribonucleic acid content of 8 wt% was prepared to prepare yeast milk; then, at a temperature of 50 ° C, the yeast in the yeast milk was killed; The supernatant was obtained by centrifugation of the yeast milk; then, a 1:1:1 protease, nuclease and transaminase with a total weight of 0.2% were added to the supernatant, and the reaction was carried out at a pH of 5.2 and a temperature of 45 ° C.
  • the enzymatic hydrolysis is carried out; the supernatant after the enzymatic hydrolysis is subjected to heat treatment at 85 ° C for 30 minutes and 4f to inactivate the enzyme; finally, the supernatant inactivated by the enzyme is concentrated, and the spray is dried by a centrifugal spray drying tower.
  • the yeast extract of 18% inositol disodium salt and guanylate disodium salt was obtained by drying. 18% is the sum of the contents of both the disulphonate disodium salt and the guanylate disodium salt, wherein the inosine disodium salt 10% guanylate disodium salt is 8%.
  • the above content was measured by HPLC method.
  • Yeast extract The high I+G yeast extract of the present invention has a more delicious mouthfeel, and the yeast extract has a stronger ability to enhance the umami taste of the food.
  • the inventors have used the above-mentioned similar operations to vary the operating condition parameters and the amounts of the respective raw materials, and found that the present invention can be basically carried out using the conditions listed below, and the yeast extract prepared by using the preferred conditions has The same effect as the product of Example 1 was obtained. Using the same procedure as above, the operations of Examples 2 - 10 were carried out in accordance with the process conditions listed in Tables 1 and 2. Table 1
  • the ratio of the peptide content to the free amino acid content is in the range of 2:3 to 1:1.
  • the peptide content was determined by high performance liquid chromatography and the amino acid content was determined by an amino acid analyzer.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Mycology (AREA)
  • Nutrition Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
  • Biochemistry (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Genetics & Genomics (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
  • Seasonings (AREA)
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Description

含有肌苷酸二钠盐和鸟苷酸二钠盐的
酵母抽提物及其制备方法 技术领域 本发明涉及一种制备含有 4-30%的 几苷酸二钠盐和鸟苷酸二钠盐( I+G, 其中 I代表几苷酸二钠盐而 G代表鸟苷酸二钠盐) 的酵母抽提物的方法, 以 及由该方法制得的含有几苷酸二钠盐和鸟苷酸二钠盐的酵母抽提物产品。 背景技术 酵母抽提物是通过将酵母细胞内的蛋白质降解成氨基酸和多肽,核酸降 解成核苷酸, 并将它们和其它有效成分, 如 B族维生素、 谷几甘肽、 £量元 素等一起从酵母细胞中抽提出来, 所制得的人体可直接吸收利用、 可溶性的 营养及风味物质的浓缩物。 近年来,随着人们生活水平的提高,人们对饮食的内容提出了新的要求, 各类食品日益朝着天然、 方便、 美味及多功能的方向发展, 食品调味料也已 由先前使用的酿造调味料或化学调味料转向具有更高级味感的天然复合调味 料方向发展; 同时调味品市场也正向着中高档、 美味、 方便、 天然、 营养的 复合调味品方向发展。 酵母抽提物含有氨基酸和多肽, 还含有核苷酸、 维生 素、 有机酸和矿物质等多种有效成分。 其味道鲜美浓郁, 具有肉香味, 是兼 营养、 调味和保健三大功能为一体的优良食品调味料, 正日益受到消费者的 欢迎。 全球对酵母抽提物市场需求的估计为 15亿美元。 欧洲的一些食品添加 剂企业, 如 DSM, 已站在了这一领域的前端, 它们提供了这一市场三分之二 的产品。这一市场的增长依然强劲,反映了对天然有效的风味增味剂的需求。 酵母抽提物被广泛应用于餐饮业, 用它可以调节所需的风味、 酸度、 嚼 感等。 在其应用的案例中, 它还对辣椒和肉的味道有一定的影响, 这可能创 造降低配料成本或增强风味的机会。 近来生物技术的进展显著扩大了其应用。最新一代的酵母抽提物具有丰 富的谷氨酸和核苷, 使其风味增强特性进一步增强。 与原本存在的氨基酸和 多肽一起, 它可以显著降低钠盐含量而不损失原有风味。 更重要的是, 它可 以使得加工商标上标注天然产物, 以此避免消费者对于人工合成或化学添加 剂的担 :。 因其在食品加工中具有特殊的调味效果及营养滋补作用, 应用范围广 泛, 在欧美、 日本等发达国家已大量使用, 在鲜味增强剂市场需求中所占比 例高达 35%。 以日本为例, 它除了部分自产之外, 每年还大量从国外进口, 消费量逐年大幅递增。 作为一种食品配料已经广泛应用在方便面、 肉制品、 调味料等行业中。 呈味核苷酸二钠是核苷酸类食品增鲜剂。由 5,-肌苷酸二钠( IMP )和 5,- 鸟苷酸二钠 ( GMP ) 按 1 : 1 的比例混合而成, 可直接加入到食品中, 起增 鲜作用。 是目前较为经济而且效果最好的鲜味增强剂, 是方便面调味包、 调 味品如鸡精、 鸡粉和增鲜酱油等的主要呈味成份之一; 与谷氨酸钠 (味精) 混合使用, 其用量以重量计约为味精的 2%-5% , 有"强力味精"之称。 已知一种制备超低盐、 浅色、 肉香型酵母提取物的工艺(参见中国调味 品 2004年第 2期, 钟瑞敏、 黄国清、 刘健南, 韶关学院英东生物工程学院, 食品工程系)。 其中, 鲜啤酒酵母在氐温下清洗脱苦, 并通过曼速冻结后解冻 可获得一定程度的破壁作用, 随后添加 5%乙醇, 釆用超声波破壁处理, 细 胞内有以重量计 46.3 %的含氮物质溢出到胞外。 自溶前酵母浆的葡萄糖含量 以重量计达到 1.49 以鲜酵母计), 对自溶酵母液的色泽褐^^加深有显著影 响。 釆用酿酒活性干酵母发酵和葡萄糖氧化酶进行除糖的前处理, 对自溶酵 母液色泽均有显著的保护作用, 可获得淡黄色的自溶液。 发酵前处理对自溶 酵母液的风味具有显著影响, 该抽提物为鸡肉香型, 且氨基酸态氮含量以重 量计达到 5.12% (以干酵母计)。 釆用以上工艺可获得超低盐含量、 色泽浅且 为肉香型的酵母提取物制品。 还已知一种双酶法降解核酸生产呈味核苷酸 I+G的技术(甘蔗糖业 2000 年第 3期), 以酵母核酸 (RNA)为原料, 釆用现代生物工程技术进行工业化生 产深层发酵制酶, 经两步酶解、 分离、 精制、 干燥、 磨粉获得的产品是 5,- 肌苷酸钠 (5,-IMP.Na2.7H2O, 简称 I)和 5,-鸟苷酸钠 (5,-GMP.Na2.7H2O,简称 G) 约各半的一种复合型食品增鲜剂。 还已知一种 5 ' -核糖核苷酸含量高的酵母提取物及其制备 (中国专利申 请第 200510124942.1 )该申请提供了 5,-核糖核苷酸和氨基酸含量比以往更高 的酵母提取物及其制备方法。 用酸性水溶液处理食用酵母, 离心分离, 将所 得沉淀物用水洗涤后,与放线菌产生的酶接触,由此制备含有 5,-肌苷酸和 5,- 鸟苷酸合计至少为 24wt % , 肽为至少 20wt % , 以及肽和游离氨基酸合计为 至少 28wt °/ 5'-核糖核苷酸含量高的酵母提取物。 普通的酵母抽提物含有大量的蛋白质、 氨基酸, 口感醇厚, 但含有的呈 味核苷酸二钠数量较少, 鲜味不够强烈。 纯粹的呈味核苷酸二钠成本较高, 而且如果单独使用, 口感不够醇厚, 鲜味不强烈, 必须和赛基酸类物质混合 才能产生鲜味。 但是釆用混合的方式, 将核苷酸二钠作为食品添加剂加入, 产品标签上必须标示含有添加剂, 从而使得产品不具有纯天然, 不含添加剂 的特点。 为此, 需要提供一种含有的呈味核苷酸二钠数量较高, 而且是天然产生 的, 无添加剂的酵母抽提物。 发明内容 为此, 本发明的目的在于提供一种这样的产品, 其富含核苷酸二钠, 综 合了酵母抽提物、 呈味核苷酸二钠两者的优点, 更重要的是, 它可以使得在 商标上标注纯天然的标识, 以此避免消费者对于人工合成或化学添加剂的担 忧。 该产品具有天然、 无添加剂的特点。 一个方面, 本发明提供一种制备含有 4-30% I+G (月几苷酸二钠盐和鸟苷 酸二钠盐) 的酵母抽提物的方法, 该方法包括:
a ) 提供核糖核酸含量 8 wt %或更多的至少一种选自由面包酵母、 发酵后的啤酒酵母、 以及圓酵母组成的组的酵母制备酵母乳;
b ) 在 40到 95 °C的温度下, 杀灭酵母乳中的酵母;
c ) 将已经杀灭酵母的酵母乳进行离心, 获得上清液; d ) 向上清液中加入蛋白酶、 核酸酶、 转氨酶, 在 pH为 4.0-6.8、 温度为 35-80 °C的条件下, 反应 12-25小时, 进行酶解;
e ) 将酶解后的上清液经 50-70分钟、 75-90 °C热处理使酶失活; f )将酶失活的上清液浓缩至 35-40wt % , 所得干物质喷雾干燥得到 较高含量的几苷酸二钠盐和鸟苷酸二钠盐的酵母提取物; 最终酵母抽提 物中的 几苷酸二钠盐和鸟苷酸二钠盐的总含量为 4-30 %。 根据本发明的方法, 其特征在于, 步骤 (d ) 中加入的酶之间的比例为
1: 1: 1。 才艮据本发明的方法, 其特征在于, 步骤 (d ) 中加入的酶以重量计占上 清液中干物质的 0.1-0.3 %。 根据本发明的方法, 加入的酶优选在 45-68摄氏度的温度下作用最佳。 才艮据本发明的方法, 在步骤 (e ) 中, 将 pH控制在 4.5-6.8的范围内。 才艮据本发明的方法, 在步骤 ( e ) 中, 作用时间控制在 16-20小时。 一种才艮据本发明的方法获得的含有几苷酸二钠盐和鸟苷酸二钠盐的酵 母抽提物。 根据本发明的酵母抽提物具备更加鲜美的口感;使酵母抽提物强化食品 鲜味的能力更强。 由于口感是人的主观评价, 暂时没有一个统一的国际标准 来定量, 可参看图 2, 图 2显示出高含量的酵母抽提物的滋味强度能持续较 长时间。 虽然通过直接向普通酵母抽提物中外加核苷酸也可以增加鲜味, 但 是存在天然性问题。 附图说明 图 1是才艮据本发明一具体实施方式的工艺流程图。 图 2是不同物质口感强度与时间的曲线图。 具体实施方式 以下将参照附图对才艮据本发明的酵母抽提物的生产方法的工艺流程进 行具体描述, 本领域技术人员应该明了, 以下的具体描述是为了便于理解本 发明, 并不用来限制本发明的保护范围。 a) 才艮据本发明的方法, 使用以糖蜜为培养基专门培养的核糖核酸 ( RNA ) 含量 8%WT 或者更多的面包酵母。 还可以使用啤酒发酵后剩余的 酵母或使用圓酵母, 其中, 这些酵母中的核糖核酸含量都要达到
Figure imgf000006_0001
%或更 多。 b ) 在 40到 95 °C的温度下, 杀灭酵母乳中的酵母; c) 将已经杀灭酵母的酵母乳进行离心, 获得上清液; d) 向上清液中加入以重量计 0.1-0.3%的 1:1:1 的蛋白酶、 核酸酶、 转 氨酶, 在 pH为 4.0-6.8、 温度为 35-80 °C的条件下, 反应 12-25小时, 进行酶 解; e) 将酶解后的上清液 75-90 °C热处理使酶失活, 离心分离; f) 将酶失活的上清液浓缩, 所得干物质喷雾干燥得到较高含量的肌苷 酸二钠盐和鸟苷酸二钠盐的膏状酵母提取物; 酵母抽提物中的肌苷酸二钠盐 和鸟苷酸二钠盐的总含量为 4-30% 根据本发明的方法, 其中, 在步骤 (d) 中, 加入的酶在 45-68摄氏度 的温度下起作用。 喷雾干燥方案: 上清液浓缩到 30%左右含量的干物质后喷雾干燥, 得到高 I+G 含量 ( 4-30 % ) 酵母抽提物。 下面将结合一些具体实施例来进一步说明本发明。 实施例 实施例 1 生产酵母抽提物 首先, 提供核糖核酸含量 8 wt%的面包酵母制备酵母乳; 然后, 在 50 °C的温度下, 杀灭所述酵母乳中的酵母; 再将所述酵母乳离心分离获得上清 液; 然后向上清液中加入以重量共计 0.2%的 1:1:1的蛋白酶、 核酸酶和转氨 酶, 在 pH为 5.2、 温度为 45°C的条件下, 反应 16小时, 进行酶解; 将所述 酶解后的上清液在 85°C经 30分 4f热处理使酶失活; 最后, 将所述酶失活的 上清液浓缩, 经离心喷雾干燥塔喷雾干燥得到含量为 18 %的肌苷酸二钠盐和 鸟苷酸二钠盐的酵母提取物。 18%是几苷酸二钠盐和鸟苷酸二钠盐的两者的 含量之和, 其中肌苷酸二钠盐 10%鸟苷酸二钠盐 8%。 上述含量釆用 HPLC 法分别测定。 由于本申请的目的就是制造 I和 G混合的产品, 所以最终产品 中两者是混合在一起的并不分离。 酵母抽提物 本发明的高 I+G 酵母抽提物具备更加鲜美的口感, 使酵母抽提物强化 食品鲜味的能力更强。 发明人釆用上面相似的操作, 对操作条件参数和各原料的用量进行变 化, 发现釆用以下所列出的条件基本能够实施本发明, 釆用优选的条件所制 出的酵母抽提物具有与实施例 1的产品基本相同的效果。 釆用上述相同的步骤, 按照表 1和 2中所列出的工艺条件, 进行实施例 2 - 10的操作。 表 1
Figure imgf000008_0001
表 2
Figure imgf000008_0002
上述结果说明, 才艮据本发明的生产方法, 可以得到 几苷酸二钠盐和鸟苷 酸二钠盐的总含量为 4-30 %的酵母抽提物。 比较例: 在中国专利 200510124942 中公开了一种 5,-核糖核苷酸含量高的醇母 提取物及其制备方法 在该方法中, 用酸性水溶液处理食用酵母, 离心分离, 所得沉淀物用水 洗涤后, 与放线菌产生的酶接触, 由此制备含有 5, -肌苷酸和 5, -鸟苷酸 合计 24重量%或以上, 肽 20重量%或以上, 以及肽和游离氨基酸合计 2 8 重量%或以上的 5, _核糖核苷酸含量高的酵母提取物。 该比较例的 I+G含量较高, 但是肽和游离氨基酸含量较低。 本发明实施例中得到的肽和游离氨基酸含量占 35 %以上。 另外, I+G 含量可以更高。 口感会更好。 本发明实施例与现有技术比较例的结果在表 3 中列出。 表 3
Figure imgf000009_0001
其中, 肽含量和游离氨基酸含量的比例在 2: 3到 1 : 1的范围内。 肽含 量由高效液相色谱法测定, 氨基酸含量由氨基酸分析仪测出。 虽然已经通过具体实施例描述和说明了本发明, 但应当理解, 对本领域 技术人员来说, 在不背离本发明的精神和范围的情况下, 可以对本发明进行 各种修改和等同替换。 因此,本发明不限于已经在本文中描述的具体实施例。 更确切地, 本发明的保护范围由所附的权利要求书限定。

Claims

权 利 要 求 书
1. 一种制备含有几苷酸二钠盐和鸟苷酸二钠盐的酵母抽提物的方法, 所 述方法包括:
a ) 提供核糖核酸含量 8 wt %或更多的至少一种选自由面包酵母、 发酵后的啤酒酵母、 以及圓酵母组成的组的酵母制备酵母乳;
b ) 在 40到 95 °C的温度下, 杀灭所述酵母乳中的酵母; c ) 离心分离所述酵母乳, 获得上清液;
d ) 向所述上清液中同时加入蛋白酶、 核酸酶、 转氨酶, 在 pH 为 4.0-6.8、 温度为 35-80 °C的条件下, 反应 12-25小时, 进行酶解;
e )将所述酶解后的上清液经 50-70分钟、 75-90 °C热处理使酶失活; f )将所述酶失活的上清液浓缩至 35-40wt % , 所得干物质喷雾干燥 得到含量为 4 %到 30 %的 几苷酸二钠盐和鸟苷酸二钠盐的酵母提取物。
2. 根据权利要求 1所述的方法, 其特征在于, 所述步骤(d ) 中加入的酶 在 45-68摄氏度的温度下起作用。
3. 根据权利要求 1或 2所述的方法, 其特征在于, 所述步骤( d ) 中加入 的酶之间的比例为 1: 1: 1。
4. 根据权利要求 1或 2所述的方法, 其特征在于, 所述步骤( d ) 中加入 的酶以重量计占上清液中干物质的 0.1-0.3 %。
5. 根据权利要求 1所述的方法, 其特征在于, 在步骤 (d ) 中, 将 pH控 制在 4.5-6.8的范围内。
6. 才艮据权利要求 1所述的方法, 其特征在于, 在步骤(d ) 中, 作用时间 控制在 16-20小时。
7. 一种利用权利要求 1-6中任一项所述的方法获得的含有几苷酸二钠盐 和鸟苷酸二钠盐的酵母抽提物。
8. 才艮据权利要求 7所述的酵母抽提物, 其中所述酵母抽提物含有 4 %到 30 %的 几苷酸二钠盐和鸟苷酸二钠盐。
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