CN110408667A - 一种提高β-胸苷产量的发酵工艺 - Google Patents
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Abstract
本发明公开了一种提高β‑胸苷产量的发酵工艺,它是将β‑胸苷的生产菌种接种到生产培养基上,经过发酵培养,制得含有β‑胸苷的发酵液,所述的生产培养基包含如下组分:葡萄糖2‑10g/L,六偏磷酸钠0‑4g/L,磷酸二氢钾1‑5g/L,磷酸氢二铵1‑5g/L,氯化钙0.2‑0.8g/L,柠檬酸0.3‑0.8g/L,甘氨酸2.5‑5g/L,酵母粉10‑30g/L,脱脂豆粉10‑30g/L,植物源蛋白粉0.5‑3g/L,氯化钙0‑5g/L,维生素B10.01g/L,烟酸0.01g/L,三氯化铁0.03g/L,七水合硫酸亚铁0.02g/L,消泡剂0.15ml/L。该工艺培养基配方合理,可实现高密度发酵培养,成本低,产量高。
Description
技术领域
本发明属于生物制药技术领域,尤其是一种提高β-胸苷产量的发酵工艺。
背景技术
β-胸苷,又称2’-脱氧胸腺嘧啶核苷,是抗艾滋病齐多夫定、司他夫定的关键中间体。
随着全球艾滋病感染人群数量急剧增加,作为“鸡尾酒”疗法中最基本成分的齐多夫定需求量与日俱增,开发廉价、大规模生产β-胸苷的工艺技术得到广泛关注。传统的合成法生产工艺过程冗长,且需要使用大量的有机溶剂,生产过程中存在安全隐患。上海创诺医药集团自主研发并构建生产β-胸苷的大肠杆菌工程菌株CN108300727A,5L发酵罐β-胸苷单位达到6.5g/L,并在放大过程中达到10.0g/L的生产水平。
现有技术中,本公司目前使用的β-胸苷生产培养基,这里我们称之为β-胸苷的对照生产培养基,它的配方为:葡萄糖2.5g/L,六偏磷酸钠4g/L,磷酸二氢钾4g/L,磷酸氢二铵4g/L,氯化钙0.5g/L,柠檬酸0.5g/L,甘氨酸3g/L,酵母粉20g/L,脱脂豆粉30g/L,胰蛋白胨2g/L,碳酸钙5g/L,维生素B10.01g/L,烟酸0.01g/L,三氯化铁0.03g/L,七水合硫酸亚铁0.02g/L,消泡剂0.15ml/L。该生产培养基的缺点是配方中无机盐添加量较多、固体不溶培养基比例较大,导致现有提取过程中固液分离和树脂除盐负荷增加。
发明内容
本发明的目的在于提供一种提高β-胸苷产量的发酵工艺,该工艺培养基配方合理,可实现高密度发酵培养,成本低,产量高。
本发明的技术方案是这样实现的:一种提高β-胸苷产量的发酵工艺,它是将β-胸苷的生产菌种接种到生产培养基上,经过发酵培养,制得含有β-胸苷的发酵液,其特征在于:所述的生产培养基包含如下组分:葡萄糖2-10g/L,六偏磷酸钠0-4g/L,磷酸二氢钾1-5g/L,磷酸氢二铵1-5g/L,氯化钙0.2-0.8g/L,柠檬酸0.3-0.8g/L,甘氨酸2.5-5g/L,酵母粉10-30g/L,脱脂豆粉10-30g/L,植物源蛋白粉0.5-3g/L,氯化钙0-5g/L,维生素B10.01g/L,烟酸0.01g/L,三氯化铁0.03g/L,七水合硫酸亚铁0.02g/L,消泡剂0.15ml/L。
进一步,所述的酵母粉为酿酒酵母粉或者面包酵母粉。
进一步,所述的植物源蛋白粉是大豆蛋白胨、小麦水解蛋白、植物多肽粉中的一种或者多种。
进一步,所述的消泡剂为聚醚类消泡剂。
进一步,在发酵过程中,按时间梯度补加葡萄糖,在各时间段补加葡萄糖的浓度为:6hr-10hr,2-5g/L/hr;10hr-16hr,3-6g/L/hr;16-40hr,4-8g/L/hr;40hr-放罐,6-10g/L/hr。
进一步,发酵过程中补料用的葡萄糖是50%-70%的葡萄糖溶液。
本发明和现有技术相比的优点为:
(1)磷元素是构成菌体核酸、核蛋白等细胞质的组成部分,是许多高能磷酸键和辅酶的成分,同时磷酸盐对培养基pH的缓冲起到一定作用。原配方中的六偏磷酸钠价格偏贵且不易获取,本发明通过对发酵配方中的其他磷酸盐调整,减少或者去除六偏磷酸钠,达到降低成本和培养基盐分的目的。
(2)胰蛋白胨含有丰富的氮源和氨基酸,是微生物生长代谢的重要氮源,由于进口胰蛋白胨价格昂贵,国产胰蛋白胨一般通过动物源的肉质或者骨头经过胰酶消化获得,存在TSE/BSE风险。本发明通过使用植物蛋白源,通过平衡植物蛋白源中的总氮和氨基氮,达到替代动物源蛋白胨的目的。
(3)碳酸钙在发酵培养基中起着缓冲pH的作用。本发明通过优化发酵配方中磷酸盐浓度,减少或者去除碳酸钙,达到减少发酵配方中不溶固形物的目的,从而降低下游提纯中固液分离的难度。
(4)大肠杆菌以葡萄糖作为碳源的发酵过程中,葡萄糖补加过慢会导致菌体碳源匮乏,从而菌体生长和合成代谢营养不足;葡萄糖补加过快会导致发酵液中残留葡萄糖积累,大肠杆菌代谢产生乙酸,进而影响菌体生长速率和代谢方向。该发明通过建立梯度补料策略,在确保发酵液中葡萄糖浓度残留很低的情况下,保证碳源充足,进而提高菌体浓度,增加β-胸苷的发酵单位。
具体实施方式
为使本发明的技术方案更加清楚,下面通过具体实施例对本发明作进一步详细的描述。
实施例1:将β-胸苷的菌种接种于如下种子培养基中,葡萄糖2.5g/L,甘油5g/L,酵母浸粉10g/L,磷酸二氢钾1.5g/L,磷酸氢二钾0.4g/L,硫酸铵1.5g/L,消泡剂0.15ml/L,培养6-8小时后,取样检测,OD值(吸光度)达到1.0-1.2,pH值6.0-6.5,镜检菌体形态均匀、整齐、量大,无杂菌,符合优良种子移种条件。
将本实施例制得的优良种子接种到背景技术中所述的β-胸苷的对照生产培养基中,培养63小时放罐,检测发酵液中电导率,固含量,菌体OD值和β-胸苷含量。
实施例2:采用例1中的优良种子,移种到如下发酵培养基中,葡萄糖8g/L,六偏磷酸钠2g/L,磷酸二氢钾4g/L,磷酸氢二铵4g/L,氯化钙0.8g/L,柠檬酸0.3g/L,甘氨酸5g/L,酵母粉20g/L,脱脂豆粉20g/L,大豆蛋白胨1.5g/L,小麦水解蛋白0.5g/L,氯化钙0.5g/L,维生素B10.01g/L,烟酸0.01g/L,三氯化铁0.03g/L,七水合硫酸亚铁0.02g/L,消泡剂0.15ml/L,培养65小时放罐,检测发酵液中电导率,固含量,菌体OD值和β-胸苷含量。
实施例3:采用例1中的优良种子,移种到如下发酵培养基中,葡萄糖2g/L,磷酸二氢钾5g/L,磷酸氢二铵5g/L,氯化钙0.3g/L,柠檬酸0.3g/L,甘氨酸4g/L,酵母粉15g/L,脱脂豆粉20g/L,小麦水解蛋白1.5g/L,植物多肽粉1.5g/L,氯化钙0.5g/L,维生素B10.01g/L,烟酸0.01g/L,三氯化铁0.03g/L,七水合硫酸亚铁0.02g/L,消泡剂0.15ml/L,培养65小时放罐,检测发酵液中电导率,固含量,菌体OD值和β-胸苷含量。
实施例4:采用例1中的优良种子,移种到如下发酵培养基中,葡萄糖5g/L,磷酸二氢钾4g/L,磷酸氢二铵4g/L,氯化钙0.3g/L,柠檬酸0.3g/L,甘氨酸5g/L,酵母粉25g/L,脱脂豆粉15g/L,大豆蛋白胨2.5g/L,氯化钙0.5g/L,维生素B10.01g/L,烟酸0.01g/L,三氯化铁0.03g/L,七水合硫酸亚铁0.02g/L,消泡剂0.15ml/L,培养66小时放罐,检测发酵液中电导率,固含量,菌体OD值和β-胸苷含量。
实施例5:采用例1中的优良种子,移种到如下发酵培养基中,葡萄糖5g/L,磷酸二氢钾4g/L,磷酸氢二铵4g/L,氯化钙0.3g/L,柠檬酸0.3g/L,甘氨酸5g/L,酵母粉15g/L,脱脂豆粉25g/L,小麦水解蛋白2.5g/L,氯化钙0.5g/L,维生素B10.01g/L,烟酸0.01g/L,三氯化铁0.03g/L,七水合硫酸亚铁0.02g/L,消泡剂0.15ml/L,培养62小时放罐,检测发酵液中电导率,固含量,菌体OD值和β-胸苷含量。
表一:实施例1-5发酵液中电导率、固含量、菌体OD值和β-胸苷含量。
组别 | 电导率us/cm | 固含量% | OD值 | β-胸苷含量g/L |
实施例1 | 8325 | 28.5 | 68.5 | 10.25 |
实施例2 | 7674 | 27.7 | 64.2 | 10.75 |
实施例3 | 7524 | 26.5 | 65.8 | 11.23 |
实施例4 | 6658 | 26.8 | 66.6 | 11.05 |
实施例5 | 6749 | 26.0 | 63.8 | 10.58 |
实施例6:采用例1中的优良种子,例3中的发酵配方,补料策略为:6hr-10hr,4.2g/L/hr;10hr-16hr,4.8g/L/hr;16-40hr,5.8g/L/hr;40hr-放罐,7.8g/L/hr,培养65小时放罐,检测发酵液中的菌体OD值,β-胸苷含量。
实施例7:采用例1中的优良种子,例3中的发酵配方,补料策略为:6hr-10hr,4.8g/L/hr;10hr-16hr,5.2g/L/hr;16-40hr,6.8g/L/hr;40hr-放罐,7.0g/L/hr,培养65小时放罐,检测发酵液中的菌体OD值,β-胸苷含量。
实施例8:采用例1中的优良种子,例4中的发酵配方,补料策略为:6hr-10hr,2.5g/L/hr;10hr-16hr,4.5g/L/hr;16-40hr,5.3g/L/hr;40hr-放罐,6.2g/L/hr,培养65小时放罐,检测发酵液中的菌体OD值,β-胸苷含量。
实施例9:采用例1中的优良种子,例4中的发酵配方,补料策略为:6hr-10hr,5.0g/L/hr;10hr-16hr,6.0g/L/hr;16-40hr,6.6g/L/hr;40hr-放罐,7.7g/L/hr,培养65小时放罐,检测发酵液中的菌体OD值,β-胸苷含量。
实施例10:采用例1中的优良种子,例5中的发酵配方,补料策略为:6hr-10hr,4.2g/L/hr;10hr-16hr,4.8g/L/hr;16-40hr,5.8g/L/hr;40hr-放罐,7.8g/L/hr,培养65小时放罐,检测发酵液中的菌体OD值,β-胸苷含量。
表二:实施例6-10发酵液中菌体OD值和β-胸苷含量。
组别 | OD值 | β-胸苷含量g/L |
实施例6 | 83.2 | 13.57 |
实施例7 | 89.5 | 14.02 |
实施例8 | 80.5 | 12.78 |
实施例9 | 91.5 | 14.22 |
实施例10 | 82.5 | 13.11 |
Claims (6)
1.一种提高β-胸苷产量的发酵工艺,它是将β-胸苷的生产菌种接种到生产培养基上,经过发酵培养,制得含有β-胸苷的发酵液,其特征在于:所述的生产培养基包含如下组分:葡萄糖2-10g/L,六偏磷酸钠0-4g/L,磷酸二氢钾1-5g/L,磷酸氢二铵1-5g/L,氯化钙0.2-0.8g/L,柠檬酸0.3-0.8g/L,甘氨酸2.5-5g/L,酵母粉10-30g/L,脱脂豆粉10-30g/L,植物源蛋白粉0.5-3g/L,氯化钙0-5g/L,维生素B1 0.01g/L,烟酸0.01g/L,三氯化铁0.03g/L,七水合硫酸亚铁0.02g/L,消泡剂0.15ml/L。
2.根据权利要求1所述的提高β-胸苷产量的发酵工艺,其特征在于:所述的酵母粉为酿酒酵母粉或者面包酵母粉。
3.根据权利要求2所述的提高β-胸苷产量的发酵工艺,其特征在于:所述的植物源蛋白粉是大豆蛋白胨、小麦水解蛋白、植物多肽粉中的一种或者多种。
4.根据权利要求3所述的提高β-胸苷产量的发酵工艺,其特征在于:所述的消泡剂为聚醚类消泡剂。
5.根据权利要求4所述的提高β-胸苷产量的发酵工艺,其特征在于:在发酵过程中,按时间梯度补加葡萄糖,在各时间段补加葡萄糖的浓度为:6hr-10hr,2-5g/L/hr;10hr-16hr,3-6g/L/hr;16-40hr,4-8g/L/hr;40hr-放罐,6-10g/L/hr。
6.根据权利要求5所述的提高β-胸苷产量的发酵工艺,其特征在于:发酵过程中补料用的葡萄糖是50%-70%的葡萄糖溶液。
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