WO2009132575A1 - 纳豆激酶(nk)超高活性粉末及其制备方法 - Google Patents

纳豆激酶(nk)超高活性粉末及其制备方法 Download PDF

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WO2009132575A1
WO2009132575A1 PCT/CN2009/071516 CN2009071516W WO2009132575A1 WO 2009132575 A1 WO2009132575 A1 WO 2009132575A1 CN 2009071516 W CN2009071516 W CN 2009071516W WO 2009132575 A1 WO2009132575 A1 WO 2009132575A1
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nattokinase
culture
adsorption
wool fiber
solution
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高柱虎
郑光南
李现光
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赖文育
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    • 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
    • C12P21/02Preparation of peptides or proteins having a known sequence of two or more amino acids, e.g. glutathione
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P7/00Drugs for disorders of the blood or the extracellular fluid
    • A61P7/02Antithrombotic agents; Anticoagulants; Platelet aggregation inhibitors
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00Drugs for disorders of the cardiovascular system
    • A61P9/10Drugs for disorders of the cardiovascular system for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
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    • C12N9/00Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
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    • C12N9/48Hydrolases (3) acting on peptide bonds (3.4)
    • C12N9/50Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
    • C12N9/52Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from bacteria or Archaea
    • C12N9/54Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from bacteria or Archaea bacteria being Bacillus

Definitions

  • NK Nattokinase ultra-high activity powder and preparation method thereof
  • the invention relates to the field of biotechnology, and particularly relates to a method and a use for producing nattokinase (NK) by using Baci l lus subti l i s.
  • nattokinase which was discovered by Dr. Japan in the University of Chicago Medical School in 1980, can be used for up to 12 hours in vivo, while urokinase is only a short 4 to 20 minutes, a difference of 60 times.
  • Kreb's thrombolytic capacity is equivalent to 200,000 yen (about 15,000 yuan) of urokinase (see; H. Sumi et al; Acta)
  • natto and nattokinase are used in their lifetime studies of cardiovascular disease and lung disease experts.
  • the most effective thrombolytic agent for the prevention and treatment of cardiovascular and related diseases, and safe and non-toxic side effects see; Al lergy Rsearch Group; "FOCUS", 2003, January).
  • the International Thrombus Association (ITA) is convinced that long-term consumption of natto is one of the main reasons for Japanese longevity.
  • the US Food and Drug Administration (FDA) fully affirmed the preventive and healing effects of natto on heart disease.
  • nattokinase has aroused great concern in the scientific community.
  • scientists and scholars from all over the world have published more than 50,000 research papers and experimental reports on nattokinase.
  • a solid fermentation method has been used.
  • Chinese patent CN1131720. 5 discloses a method for producing nattokinase, which uses solid fermentation method and cell breaking technology to produce nattokinase. Preparation of kinase thrombolytic drugs such as tablets, granules, hard capsules, and soft capsules.
  • the natto manufacturing method according to the conventional method has a complicated production process and cannot increase the activity of nattokinase, and the natto fermented product obtained by these methods has a strong adhesive force and a odor, and the consumer feels that the taste is difficult to receive.
  • the initial requirements for general foods, especially pharmaceuticals, are sterile. Nattokinase is prone to loss of activity at high temperatures. Therefore, it is not possible to use high-pressure autoclaving to use sterilized membranes of 0.222um to achieve sterility of the product, but natto The fermenting material has a very strong adhesive force and is difficult to filter.
  • An object of the present invention is to improve the activity of nattokinase by more than ten times that of the conventional method by using a liquid culture method of a fermenter, which can achieve sterilizing.
  • Another object of the present invention is to disclose a unique nattokinase selective adsorption purification method using wool fiber, which can improve the purity, activity, and odorlessness of nattokinase in one treatment, and achieve low cost and high efficiency. .
  • a method for producing nattokinase comprising the following steps:
  • the present invention provides a method for producing nattokinase comprising the following steps:
  • nattokinase powder The eluate is centrifuged, sterilized and filtered, and lyophilized to obtain nattokinase powder. among them:
  • the natto bacteria described in the above step (1) is Bacillus subtilis, and the liquid culture of the natto fermenter scale includes two defects:
  • Inoculation culture Bacillus subtilis was cultured in LB medium at 37 ° C for 12-24 hours.
  • LB broth per 100 ml: trypsin 0.5_3 g, yeast extract 0. l_lg, sodium chloride 0. l_lg.
  • Inoculation of the mother fermentation broth Inoculum size 0.1-0.8%, culture temperature 35-40 ° C, rotation speed 200 rpm-250 rpm, culture time 10-15 h.
  • composition of the fermenter culture solution is (per 100 ml): tryptone l_5g, starch hydrolysate l_5g, salt 0. l_2g, disodium hydrogen phosphate 0. l_2g, gelatin 0.01-0. lg.
  • the fermenter used was 50-100L in size.
  • the wool fiber may be one of the following, but not limited thereto:
  • Fine wool in the range of 5-9 cm, semi-fine wool of 7-15 cm in length, coarse wool of 6_40 cm in length, or three kinds of cut wool.
  • the washing described in the step (3) is: washing with tap water at 4 ° C for 3 times, each time centrifuging 6000 rpm, 5 min. The supernatant is removed and the wool adsorbed with nattokinase is retained.
  • the alkaline solution described in the step (4) is sodium hydroxide or ammonium hydroxide (ammonia water), and its concentration is 0. 05-0. 15N, preferably 0. INo washing temperature: 4 ° C; washing time 100_150s .
  • step (5) The dialysis described in step (5) can be carried out using a dialysis bag generally sold (pore diameter less than 5000 kDa). Dialysis solution: double distilled water 15-25 times, dialysis temperature 4 °C, dialysis time 15- 25h.
  • the sterilizing filter is a filter membrane having a pore diameter of 0.222 um
  • nattokinase After lyophilization, nattokinase has a moisture content of 8% or less.
  • the present invention employs liquid fermentation.
  • the solid fermentation has small investment, low production cost and easy promotion, its disadvantages are high labor intensity, easy to be contaminated by bacteria, and difficult to control the fermentation process.
  • the solid medium has too much viscosity and unique odor, so purification The process is complicated, consumers are not used to it, etc.
  • liquid fermentation has a large investment, the production conditions are easy to control, and the product stability is good. As the scale is expanded, the cost is greatly reduced.
  • the method of the invention is therefore suitable for large scale industrial production.
  • the invention adopts wool fiber as adsorbent, and has strong unique selective adsorption effect on nattokinase, and the method can improve the purity, activity and odorless degree of nattokinase in one treatment. Therefore, the use of the invention reduces the purification operation steps, achieves low cost and high efficiency, and prepares the obtained nattokinase powder without odor, and is easy for the consumer to pick up as a product.
  • the nattokinase powder obtained by the common production method generally has an activity of ⁇ 20,000FU/g, and the activity of the nattokinase powder obtained by the invention can be as high as 253,000FU/g (see Table 1), so the present invention is adopted.
  • the nattokinase powder obtained by the preparation method is very suitable as a medicine, a health food, a food additive, and is used for prevention and treatment of cardiovascular and cerebrovascular thrombosis, arteriosclerosis, aging, coronary heart disease and the like.
  • Figure 1 shows the standard curve of the nattokinase powder FU unit.
  • the fermentation tank liquid culture is carried out as follows:
  • Inoculum culture Bacillus subtil is incubated with LB medium at 37 for 12-24 hours.
  • Dialysis solution double distilled water 20 times, dialysis temperature 4 ° C, dialysis time 18 hours, centrifuge after dialysis: lOOOOrpm, 5 points
  • Filter membrane 0. 22um, moisture content below 8% after lyophilization
  • Example 2 Qualitative identification of the nattokinase powder activity obtained by the present invention is referred to KoJuHo et al: J. KIMILSUNG Uni, 1996, 26, 4, 100-104, using the blood fiber block decomposition time method for Xinluyuan nattokinase powder.
  • the plasmin activity was qualitatively identified.
  • SP the above nattokinase powder was appropriately diluted with 0.85% saline, and added to a test tube contained in a blood clot formed of 25 ul of rabbit plasma.
  • the blood clot containing the above nattokinase powder sample was completely dissolved in 60 minutes, and the blood clot added with 0.85% saline as a control did not dissolve.
  • Example 3 Quantitative identification of the nattokinase powder activity obtained by the present invention is described in Takano et al: Investigative Ophthalmology & Visual Science, 2006, 47, 5, 2075-2076, using blood fiber decomposition analysis method (Japan Health) On January 15, 2003, Kang Food Supervision Bureau officially decided that the method was used as a method for measuring nattokinase activity, unit FU ; ) quantitatively identifying the plasmin activity of the nattokinase powder of the present invention. 5 ⁇ I. 5cm of the diameter of 1. 5cm of the diameter of 1. 5cm of the phlebine Place in a test tube and place at 37 ° C for 5 min.
  • control experiment was as follows: In the above process, 2 ml of 200 mM trichloroacetic acid solution was added before the addition of nattokinase, and then the following operations were carried out after adding nattokinase.
  • Nattokinase powder (22000FU/g) of Japan NABI0 CO LTD was used as a standard.
  • the standard curve is shown in Figure 1.
  • Nattokinase produced by the method of the present invention containing 2000FU-10000FU/g is added to medicines and health foods for preventing or treating thrombotic cardiovascular and cerebrovascular diseases.

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Description

纳豆激酶 (NK)超高活性粉末及其制备方法 技术领域
本发明涉及生物技术领域, 具体涉及利用枯草杆菌 (Baci l lus subti l i s ) 生产纳豆激酶 (Nattokinase,NK) 的方法和用途。
背景技术
当前, 在抢救血栓病人的用药中, 比较广泛地选用链激酶(SK), 尿激酶(UK)和组织纤溶酶原激活剂(t-PA)等。 但这些药物在实际 应用中表现出许多缺陷,例如,有血栓易复发,在血液中的半衰期短, 以及总使用剂量大, 治疗费用高和在体内作用单一等缺点 (参见; 《生 物工程进展》 2002 , Vol . 22 , Νο. 1)。
1980年在美国芝加哥大学医学院做研究的日本须见博士偶然发 现的纳豆激酶, 在体内作用时间最长可达 12小时, 而尿激酶只有短短 的 4一 20分钟,相差 60倍, 100克纳豆的溶栓能力,相当于 20万日元(约 合人民币 15000元) 的尿激酶(参见; H. Sumi et al ; Acta
Haematologica, 1990, 84, 139-143)。
1996年朝鲜高柱虎博士发现一种多功能性的纳豆激酶类纤溶酶, 该酶具有比较高的纤维蛋白溶解能力和在机体内抗蛋白质氧化的功 會^ 减少了机体内过氧化物的量增加给机体带来的伤害 (参见; KoJuHo et al: J. KIMILSUNG Uni , 1996, 4, KoJuHo et al : J. Biochem. Mol. Biol. 2005, 5)。
波兰和日本心肺血管疾病专家 Martin和 Konhei两位博士说, 对心 血管疾病和肺疾病专家-他们的一生研究中, 纳豆和纳豆激酶是用于 预防和治疗心脑血管及相关疾病的最有效的溶栓剂, 且安全、无毒副 作用(参见; Al lergy Rsearch Group ; "FOCUS " , 2003, January) 。 国际血栓联合会(ITA)确信: 长期食用纳豆是日本人长寿的主要原因 之一。 美国联邦食品药监督署 (FDA)则充分肯定了纳豆对心脏病的预 防、 康复效果。
因此有关纳豆激酶的研究引起科学界极大关注, 截至 2006年, 各国科学家、 学者发表有关纳豆激酶的研究论文、 实验报告, 已多达 5万余篇。 目前国内生产纳豆激酶的方式上, 已有采用固体发酵方式, 例如 中国专利 CN1131720. 5公开了一种纳豆激酶生产方法, 该方法中采用 固体发酵法和细胞破壁技术生产纳豆激酶并制取片剂、冲剂、硬胶囊、 软胶囊等激酶溶栓药物。
按照传统方法的纳豆制造方法生产工艺复杂,不能提高纳豆激酶 的活性,而且利用这些方法所得的纳豆发酵物具有很强的粘贴力和臭 香味, 消费者觉得味道难以接收。一般食品特别是药品的初歩要求就 是无菌, 纳豆激酶在高温下容易失去活性, 所以不能用高压高温灭菌 不得不利用 0. 22um的除菌过滤膜实现产品的无菌化, 但纳豆发酵物 的粘贴力非常大, 难以过滤。在纳豆激酶的分离纯化工艺上, 目前为 止 已有离子交换层析法 (CN200410025769. 5) 和反胶团法 (CN200410037391. 0)及磁性微球分离纯化法(CN200510075057. 9 )等 方法已获得专利。
发明内容
本发明的一个目的, 在利用发酵罐的液体培养方法, 用该方法能 把纳豆激酶的活性提高到传统方法的十几倍, 能实现无菌化。 本发明的另一个目的,在于公开利用羊毛纤维的一种独特的纳豆 激酶选择性吸附纯化方法, 该方法能一次处理提高纳豆激酶的纯度、 活性、 无臭程度, 而且实现低成本高效率。
为实现上述的目的, 本发明的技术方案是: 一种纳豆激酶制造方 法, 包括以下歩骤:
即, 本发明提供纳豆激酶制造方法包括以下歩骤:
(1)、 纳豆菌发酵罐规模液体培养:
(2)、 利用羊毛纤维选择性吸附
(3)、利用自来水洗涤非吸附的各种物质包括细菌、剩下的培养 成分、 杂蛋白等;
(4)、 利用碱性溶液洗脱纳豆激酶;
(5)、洗脱液经透析后离心、除菌过滤、冻干得到纳豆激酶粉末。 其中:
歩骤 (1) 所述的纳豆菌为枯草杆菌 (Bacillus subtilis) ,所 述的纳豆菌发酵罐规模液体培养包括两歩:
①、 种菌培养: 将纳豆菌 (Bacillus subtilis) 用 LB培养液在 37°C进行培养 12-24h。 LB培养液(每 100ml当中):胰蛋白胨 0.5_3g、 酵母膏 0. l_lg、 氯化钠 0. l_lg。
②、 母发酵液的接种: 接种量 0.1-0.8%,培养温度 35-40°C, 转 速 200rpm-250rpm, 培养时间 10_15h。
发酵罐培养液成分为 (每 100ml当中): 胰蛋白胨 l_5g、 淀粉水 解物 l_5g、 食盐 0. l_2g、 磷酸氢二钠 0. l_2g, 白明胶 0.01-0. lg。
所用的发酵罐规模为 50_100L。
歩骤(2)所述的羊毛选择性吸附为: 培养液: 羊毛纤维 =40-60: 1(重量比),吸附温度为 4°C,吸附时间为 7-9h,搅拌速度 60_100rpm。 所述的羊毛纤维可以是以下的一种, 但不以此为限: 长度在
5. 5-9cm范围内的细羊毛, 长度 7-15cm的半细毛, 长度 6_40cm的粗 羊毛, 或是以上三种经剪碎的羊毛。
歩骤 (3 ) 所述的洗涤为: 利用 4°C自来水洗 3 次, 每次离心 6000rpm, 5min。 去上清液, 保留吸附有纳豆激酶的羊毛。
歩骤(4)所述的碱性溶液为氢氧化钠或氢氧化铵(氨水), 其浓 度: 0. 05-0. 15N, 最佳为 0. INo洗涤温度: 4°C ; 洗涤时间 100_150s。
歩骤 (5 ) 所述的透析可使用一般销售的透析袋 (孔直径小于 5000kDa)。 透析溶液: 双蒸水 15-25 倍, 透析温度 4°C, 透析时间 15- 25h。
透析后离心: lOOOOrpm, 5min, 4°C。
除菌过滤采用过滤膜, 其孔直径为 0. 22um,
纳豆激酶冻干后水分含量 8%以下。
本发明的有益效果在于:
1、 本发明采用了液体发酵。 固体发酵虽然投资较小, 生产成本 低, 便于推广, 但其缺点是劳动强度大、 易受杂菌污染、 发酵过程不 易控制, 特别是固体培养液粘度太大而有独特的臭味, 因此纯化过程 复杂、 消费者不习惯等。 而液体发酵虽然投资大, 但生产条件易于控 制, 产品稳定性好, 随着规模的扩大, 成本大幅度下降。 因此本发明 的方法适于大规模工业化生产。
2、 本发明采用羊毛纤维作为吸附剂, 其对纳豆激酶具有很强的 独特性选择吸附作用,该方法能一次处理提高纳豆激酶的纯度、活性、 无臭程度。 因此, 采用本发明减少了纯化的操作歩骤, 实现低成本高 效率, 而且制备所得的纳豆激酶粉末无异味, 作为产品易为消费者接 3、 普通生产方法所得到的纳豆激酶粉末, 其活性一般 <20, 000FU/g,而本发明所得的纳豆激酶粉末活性可高达 253, 000FU/g (见表一), 因此采用本发明的制备方法所得的纳豆激酶粉末 极适合作为药品、保健食品、食品添加剂,用于预防而治疗心脑血栓、 动脉硬化、 衰老、 冠心病等。
附图说明
图 1就是纳豆激酶粉 FU单位决定标准曲线。
具体实施方式
下面就本发明的上述各歩骤中的具体操作作详细说明。
实施例 1, 纳豆激酶生产
首先, 进行发酵罐液体培养, 具体操作如下:
(1)种菌培养: 将纳豆菌 Bacillus subtil is用 LB培养液在 37 进行培养 12-24小时。
LB培养液: 胰化(蛋白)胨 1%, 酵母膏 0. 5%, 氯化钠 0. 5%
(2)母发酵液的接种: 取上述种菌培养液 0. 1-1. 0L, 种于在发酵 罐里已灭好的下述母发酵液 50-100L 当中而在 30-40 °C进行培养 10-15小时。
母发酵液:
蛋白胨 1%, 淀粉分解物 2%, 食盐 0. 5%, 磷酸氢二钠 0. 5%, 白 明胶 0. 05%
用羊毛纤维处理培养液, 具体操作如下:
(1)培养液离心
离心条件: 6000rpm, 10 min, 4°C
(2)利用毛纤维选择性吸附纳豆激酶 吸附条件:
培养液: 毛纤维 = 50: 1 (重量比), 吸附温度; 4°C, 吸附时 间; 8小时, 搅拌速度; 80rpm
(3)非吸附的物质洗涤
洗涤条件:
利用 4°C自然水洗 3次, 每次离心 6000rpm, 5分
(1)纳豆激酶的洗脱
洗脱条件:
洗脱溶液; 氢氧化钠 0. IN, 洗涤温度; 4°C, 洗涤时间; 120s (2)洗脱液的透析
透析条件:
透析溶液: 双蒸水 20倍, 透析温度 4°C, 透析时间 18小时 透析后离心: lOOOOrpm, 5分
(3)除菌过滤而冻干
过滤膜: 0. 22um, 冻干后水分含量 8%以下
实施例 2, 对本发明所得的纳豆激酶粉末活性的定性鉴定 参照 KoJuHo et al : J. KIMILSUNG Uni , 1996, 26, 4, 100-104, 用血纤维块分解时间法对欣绿源纳豆激酶粉末的纤溶酶活性进行定 性鉴定。 SP, 将上述的纳豆激酶粉末用 0. 85%食盐水作适当稀释, 加 到由 25ul兔血浆形成的血凝块包含的试管内。 加入了上述纳豆激酶 粉末样品的血凝块在 60分钟内全溶解, 而加入了作为对照的 0. 85% 食盐水的血凝块不溶解。
实施例 3, 对本发明所得的纳豆激酶粉末活性的定量鉴定 参照 Takano et al : Investigative Ophthalmology & Visual Science, 2006, 47, 5, 2075 - 2076, 用血纤维分解分析法(日本健 康食品监督局在 2003年 1月 15日正式决定该方法作为纳豆激酶活性 测定方法, 单位 FU ; ) 对本发明的纳豆激酶粉末的纤溶酶活性进行定 量鉴定。 即, 将 0. 72%人血纤维蛋白源(Fibrinogen, Solarbio Co. Ltd) 0. 4ml和 50mM硼酸缓冲液(pH 8. 5, 0. 9% NaCl) 1. 4ml加入到 直径 1. 5cm的试管里后放置在 37°C, 5min。 然后将 20U/ml 凝血酶 (Sigma Co. Ltd) 0. lml加入到试管里混合后再放置在 37°C, lOmin, lOmin后将适合稀释的纳豆激酶溶液 0. lml加入到试管里, 混合后放 置在 37°C, 以后每 20min后混合一次。 放 37°C, 60min后将 200mM 三氯乙酸溶液 2ml加到试管里, 混合后在 37°C放 20min。 然后将试 管里溶液在 15000rpm, lOmin 离心后取 lml 的上清液测定 0D 值 (275nm) .
对照实验如下: 上述的过程当中纳豆激酶加入之前先加入 200mM 三氯乙酸溶液 2ml, 然后加纳豆激酶后以下操作同样。
把日本 NABI0 CO LTD的纳豆激酶粉末(22000FU/g)作为标准品。 标准曲线见图 1。
在上述本发明的纳豆激酶粉末的纤溶酶活性的定性、 定量实验 中, 使用了不同批次的三批本发明的纳豆激酶粉末作为样品。 具体 结果见表 1。 表中, GPB-NK No00000f 000003为本发明所得到的纳豆 激酶, NABIO-NK Sample为日本 NABI0公司的纳豆激酶样品。
实施例 4: 本发明所得的纳豆激酶粉末的应用
在药品、 保健食品中加入含有 2000FU-10000FU/g采用本发明的 方法生产的纳豆激酶, 用于预防或治疗血栓类心脑血栓疾病。
上面是对本发明的具体说明,但这些说明不应认为是对本发明的 限定。 本领域的技术人员知道, 根据上面对本发明的说明, 可对本发 明的具体实施方式作各种修改和变更而不偏离本发明的实质和由附 具的权利要求书所决定的保护范围。 表 1. 各种单位的纳豆激酶粉末 (GPB-NK)活性定量结果
Figure imgf000010_0001

Claims

权 利 要 求
1.一种纳豆激酶的生产方法, 其特征在于, 包括以下歩骤:
( 1 )、 纳豆菌用发酵罐规模液体培养;
( 2 )、 利用羊毛纤维选择性吸附;
( 3 )、利用自来水洗涤非吸附的各种物质包括细菌、剩下的一样 成分、 杂蛋白等;
( 4)、 利用碱性溶液洗脱纳豆激酶;
( 5 )、 洗脱液经透析、 除菌过滤、 冻干得到纳豆激酶粉末。
2.如权利要求 1所述的纳豆激酶的生产方法, 其特征于: 所述的 纳豆菌发酵罐规模液体培养条件为: 种菌培养 12_24h, 接种量 0. 1-0. 8% (体积比), 培养温度 35-40 °C , 转速 200-250rpm,培养时间 10-15h; 培养液组成成分; 蛋白胨 10-50g、 淀粉分解物 10-50g、 食 盐 l-2g、 磷酸氢二钠 l_2g, 白明胶 0. l-lg, 用水调到 1L。
3.如权利要求 1所述的纳豆激酶生产方法, 其特征于: 所述的利 用羊毛纤维选择性吸附为: 培养液: 羊毛纤维 =40-60: 1 (重量比), 吸附温度为 4°C ; 吸附时间为 7-9h, 搅拌速度为 60-100rpm。
4.如权利要求 1所述的纳豆激酶生产方法, 其特征于: 所述的碱 性溶液为 0. 05N-0. 15N的氢氧化钠或氢氧化铵 (氨水) 溶液。
5.—种含纳豆激酶的药物, 其特征在于所述的片剂、 冲剂、 胶囊 或口服液中加 2000-10000FU/g权利要求广 4所述的方法生产的纳豆 激酶。
6.—种纳豆激酶的保健食品、食品添加剂, 其特征在于所述的产 品中包括 2000-10000FU/g权利要求广 4所述的方法生产的纳豆激酶。
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