WO2022222213A1 - 一种产β-榄香烯工程菌及其构建方法和用途 - Google Patents
一种产β-榄香烯工程菌及其构建方法和用途 Download PDFInfo
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- WO2022222213A1 WO2022222213A1 PCT/CN2021/094795 CN2021094795W WO2022222213A1 WO 2022222213 A1 WO2022222213 A1 WO 2022222213A1 CN 2021094795 W CN2021094795 W CN 2021094795W WO 2022222213 A1 WO2022222213 A1 WO 2022222213A1
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- the recombinant bacteria express acetoacetyl-CoA thiolase atoB, 3-hydroxy-3-methylglutaryl-CoA synthase ERG13, truncated 3-hydroxy-3-methylglutaryl-CoA Reductase tHMG1, mevalonate kinase ERG12, phosphomevalonate kinase ERG8, pyrophosphate mevalonate decarboxylase MVD1, pyrophosphate prenyl isomerase idi and farnesenyl pyrophosphate synthase ispA
- the expression vector is pACYCDuet-1 vector.
- Acetoacetyl-CoA thiolase atoB gene 3-hydroxy-3-methylglutaryl-CoA synthase ERG13 gene, truncated 3-hydroxy-3-methylglutaryl-CoA reductase tHMG1 gene, mevalonate kinase ERG12 gene, phosphomevalonate kinase ERG8 gene, pyrophosphate mevalonate decarboxylase MVD1 gene, pyrophosphate prenyl isomerase idi gene and farnesenyl pyrophosphate synthase.
- the enzyme ispA gene was linked to the pACYCDuet-1 vector, transformed into competent cells, positive clones were picked, and the recombinant plasmid pACYCDuet-FPP was extracted;
- volume ratio of the organic solvent to the fermentation broth is 2:1 to 1:20.
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Abstract
提供了一种产β-榄香烯的重组菌,还提供了该重组菌的构建方法和利用该重组菌生产β-榄香烯的方法。该重组菌表达来自加拿大一枝黄花的吉玛烯A合酶(ScGAS),并引入包含大肠杆菌的atoB、idi、ispA和酿酒酵母的ERG13、tHMG1、ERG12、ERG8、MVD1重组质粒,经过发酵条件优化,β-榄香烯产量达到156.94mg/L。
Description
本发明涉及代谢工程、合成生物学和生物制药等技术领域,特别涉及一种产β-榄香烯菌株的构建方法及用途。
以β-榄香烯(β-elemene)为主要成分的榄香烯类化合物,为国家Ⅱ类非细胞毒性抗肿瘤新药。β-榄香烯具有诱导肿瘤细胞凋亡、抑制其增殖、转移和主动免疫保护等作用,临床上可以单独或与其他化疗药物联合用于治疗各种癌症,此外还具有抗氧化、抗菌、抗病毒、改善微循环等药效,因此具有良好医药价值和应用前景。
目前市场的β-榄香烯主要是从中药莪术中提取获得。该获取方法成本高、纯度低,而常规化学全合成方法的步骤繁琐、反应条件苛刻、得率低、环境不友好,限制了β-榄香烯的供给和应用。因此,寻找新的β-榄香烯经济可行的量产技术,对该类药物的推广应用具有重要意义。
合成生物学的发展,为规模化生产自然界中含量低、结构复杂、应用价值高的天然产物提供了新的方法。利用微生物生长速度快、周期短、成本低、遗传背景清楚有利于遗传改造等优点,通过构建重组细胞、异源重组天然产物的合成途径,已有快速、大量获取中间体和终产物的成功范例:在酿酒酵母中构建青蒿素的生物合成途径,其前体青蒿酸的产量达到25g/L(Paddon,C.J.,et al.Nature 496.7446(2013):528.)。
β-榄香烯是植物中比较常见的一类倍半萜类化合物,但目前尚无β-榄香烯合酶被克隆,β-榄香烯是由吉玛烯A经cope重排而来的,而吉玛烯A则是经吉玛烯A合酶催化底物法呢烯基焦磷酸FPP获得。研究开发一种快速、高产、环境友好的β-榄香烯的制备方法成为当前亟待研究的重要课题。
发明内容
鉴于此,本发明的目的是提供了一种产β-榄香烯菌株及其构建方法。本发明通过构建产生倍半萜类化合物的前体法呢烯基焦磷酸(FPP)的重组质粒和构建来源于加拿大一枝黄花(Solidago canadensis)的吉玛烯A合酶ScGAS重组质粒,获得含有上述重组质粒的大肠杆菌工程菌株,并通过优化温度、诱导剂浓度、诱导时间和诱导时菌液浓度,从而实现快速、高产地制备β-榄香烯。
为实现上述目的,本发明采取如下技术方案:
一种产β-榄香烯的重组菌,所述重组菌表达吉玛烯A合酶ScGAS、乙酰乙酰辅酶A硫解酶atoB、3-羟基-3-甲基戊二酰辅酶A合酶ERG13、截短的3-羟基-3-甲基戊二酰辅酶A还原酶tHMG1、甲羟戊酸激酶ERG12、磷酸甲羟戊酸激酶ERG8、焦磷酸甲羟戊酸脱羧酶MVD1、焦磷酸异戊烯脂异构酶idi和法呢烯基焦磷酸合酶ispA。
进一步地,所述吉玛烯A合酶ScGAS的氨基酸序列如SEQ ID NO.2所示。
进一步地,所述吉玛烯A合酶ScGAS的核苷酸序列如SEQ ID NO.1所示或如SEQ ID NO.3所示,
进一步地,所述乙酰乙酰辅酶A硫解酶atoB的核苷酸序列如SEQ ID NO.4所示,3-羟基-3-甲基戊二酰辅酶A合酶ERG13的核苷酸序列如SEQ ID NO.5所示、截短的3-羟基-3-甲基戊二酰辅酶A还原酶tHMG1的核苷酸序列如SEQ ID NO.6所示、甲羟戊酸激酶ERG12的核苷酸序列如SEQ ID NO.7所示、磷酸甲羟戊酸激酶ERG8的核苷酸序列如SEQ ID NO.8所示、焦磷酸甲羟戊酸脱羧酶MVD1的核苷酸序列如SEQ ID NO.9所示,焦磷酸异戊烯脂异构酶idi的核苷酸序列如SEQ ID NO.10所示、法呢烯基焦磷酸合酶ispA的核苷酸序列如SEQ ID NO.11所示。
进一步地,所述重组菌为重组大肠杆菌或重组酵母菌。
进一步地,所述吉玛烯A合酶ScGAS的表达载体为pGEX-4T1载体。
进一步地,所述重组菌表达乙酰乙酰辅酶A硫解酶atoB、3-羟基-3-甲基戊二酰辅酶A合酶ERG13、截短的3-羟基-3-甲基戊二酰辅酶A还原酶tHMG1、甲羟戊酸激酶ERG12、磷酸甲羟戊酸激酶ERG8、焦磷酸甲羟戊酸脱羧酶MVD1、焦磷酸异戊烯脂异构酶idi和法呢烯基焦磷酸合酶ispA的表达载体为pACYCDuet-1载体。
进一步地,所述乙酰乙酰辅酶A硫解酶atoB、3-羟基-3-甲基戊二酰辅酶A合酶ERG13、截短的3-羟基-3-甲基戊二酰辅酶A还原酶tHMG1的基因连接到pACYCDuet-1的多克隆位点MCS1位点,所述甲羟戊酸激酶ERG12、磷酸甲羟戊酸激酶ERG8、焦磷酸甲羟戊酸脱羧酶MVD1、焦磷酸异戊烯脂异构酶idi和法呢烯基焦磷酸合酶ispA的基因连接到pACYCDuet-1的MCS2位点。
本发明另一方面提供了上述产β-榄香烯的重组菌的构建方法,主要包括以下步骤:
(1)将吉玛烯A合酶ScGAS基因连接到pGEX-4T1载体中,转化感受态细胞,挑取阳性克隆,提取重组质粒pGEX-4T1-ScGAS;
(2)将乙酰乙酰辅酶A硫解酶atoB基因、3-羟基-3-甲基戊二酰辅酶A合酶ERG13 基因、截短的3-羟基-3-甲基戊二酰辅酶A还原酶tHMG1基因、甲羟戊酸激酶ERG12基因、磷酸甲羟戊酸激酶ERG8基因、焦磷酸甲羟戊酸脱羧酶MVD1基因、焦磷酸异戊烯脂异构酶idi基因和法呢烯基焦磷酸合酶ispA基因连接到pACYCDuet-1载体中,转化感受态细胞,挑取阳性克隆,提取重组质粒pACYCDuet-FPP;
(3)将步骤(1)所得的pGEX-4T1-ScGAS重组质粒和步骤(2)所得的pACYCDuet-FPP共同转化感受态细胞,挑取阳性克隆即得产β-榄香烯的重组菌株。
进一步地,步骤(3)中的感受态细胞为E.coil BL21(DE3)。
本发明提供了一种利用上述产β-榄香烯的重组菌生产β-榄香烯的方法,所述方法主要包括以下步骤:
(1)在转速50~300rpm,温度20~32℃的培养条件下,培养上述产β-榄香烯的重组菌,待重组菌液浓度A
600为0.2~2时,加入IPTG诱导剂至终浓度为0.01~1.0mM,继续培养至12-120h;
(2)使用有机溶剂萃取发酵液中的β-榄香烯,离心收集有机相,即得。
进一步地,所述培养的培养基为液体LB培养基。
进一步地,所述有机溶剂为乙酸乙酯、己烷、石油醚或氯仿中的一种或2种以上的混合物。
进一步地,所述有机溶剂与发酵液的体积比2:1~1:20。
本发明相对于现有技术具有的有益效果如下:
1.本发明构建的产β-榄香烯工程菌具备产量高、纯度高、低成本、无污染等特点,适于工业化生产β-榄香烯。
2.本发明的产β-榄香烯工程菌经发酵条件优化后β-榄香烯产量高达156.94mg/L。
为了更清楚地说明本发明实施例,下面将对实施例涉及的附图进行简单地介绍。
图1重组质粒pACYCDuet-FPP示意图。
图2重组菌株和β-榄香烯的产量对应图。
图3共同表达pGEX-4T1-ScGAS和pACYCDuet-FPP工程菌发酵条件正交实验组合中的β-榄香烯产量。
下面结合实施例对本发明进行详细的说明,但本发明的实施方式不限于此,显而易见 地,下面描述中的实施例仅是本发明的部分实施例,对于本领域技术人员来讲,在不付出创造性劳动性的前提下,获得其他的类似的实施例均落入本发明的保护范围。
下述实施例中,采用的pGEX-4T1载体、pACYCDuet-1购自于上海生工生物有限公司,E.coli Trans-1和E.coil BL21(DE3)感受态细胞购自于上海源叶生物科技有限公司。
实施例1 重组质粒pGEX-4T1-ScGAS构建
依据NCBI数据库中加拿大一枝黄花来源的吉玛烯A合酶ScGAS,其核苷酸序列如SEQ ID NO.1所示,其氨基酸序列如SEQ ID NO.2所示。由生工生物工程(上海)股份有限公司依据大肠杆菌密码子进行优化、合成基因和测序,获得密码子优化后的核苷酸序列如SEQ ID NO.3所示,并***到pBlueScript II SK(+)载体中,构成pBlueScript II SK(+)-ScGAS重组质粒。
将pBlueScript II SK(+)-ScGAS重组质粒和pGEX-4T1质粒分别用EcoR I与Sal I进行双酶切后(20μl酶切总体系中,10×Quic.Cut Green Buffer 2μl,EcoR I与Sal I各1μl,质粒pBlueScript II SK(+)-ScGAS或pGEX-4T1各8μl,ddH
2O 8μl),跑1%琼脂糖凝胶电泳后,切胶回收后,连接入pGEX-4T1载体(10μl连接总体系中,Solution I 5μl,pGEX-4T1线性化载体1μl,ScGAS片段4μl,16℃反应3小时),转化E.coli Trans-1感受态细胞,涂布含100mg/L的LB/Amp平板,37℃培养过夜,挑取转化子进行菌落PCR验证(20μlPCR体系中,10×ExTaq Buffer 2μl,dNTP 2μl,ScGAS-F和ScGAS-R各1μl,菌液1μl,ExTaq酶0.3μl,ddH
2O 12.7μl;PCR反应条件首先98℃变性5min;其次98℃变性30sec,58℃退火30sec,72℃延伸2min,32个循环;最后72℃再延伸15min;引物序列见表1),提取阳性菌落的质粒即pGEX-4T1-ScGAS重组质粒。
表1.引物序列表
实施例2 重组质粒pACYCDuet-FPP构建
2.1基因全长序列的获得
提取大肠杆菌Trans-1和酿酒酵母S288C全基因组序列。依据NCBI上公布的atoB、ERG13、tHMG1、ERG12、ERG8、MVD1、idi、ispA基因序列设计引物(7-22号引物,序列见表1),以上述大肠杆菌基因组DNA为模板扩增atoB、idi、ispA,以酵母基因组DNA为模板扩增ERG13、tHMG1、ERG12、ERG8、MVD1,使用高保真酶PrimeSTAR
GXL(Takara)进行扩增(50μlPCR体系中,5×PrimeSTAR Buffer 10μl,dNTP 4μl,引物-F和引物-R各1μl,模板1μl,PrimeSTAR酶0.5μl,ddH
2O 32.5μl;PCR反应条件首先98℃变性5min;其次98℃变性10sec,55-60℃退火5sec,68℃延伸1-2min,32个循环;最后,68℃再延伸15min),跑1%琼脂糖凝胶电泳后,切胶回 收后,回收产物使用ExTaq酶进行加A尾反应,与pMD18-T载体连接后,转化E.coli Trans-1感受态细胞,涂布含100mg/L的LB/Amp平板,37℃培养过夜,挑取转化子进行菌落PCR验证,阳性克隆送上海生工生物有限公司进行测序,测序正确的菌落,提取质粒后可作为后续载体构建的模板。
2.2利用重叠PCR原理构建操纵子A和B
操纵子A中包含基因atoB、ERG13、tHMG1,操纵子B中包含基因ERG12、ERG8、MVD1、idi、ispA。分别以步骤2.1中含有atoB、ERG13、tHMG1质粒为模板,用高保真酶PrimeSTAR
GXL进行PCR扩增,使用各自基因正反向引物(23-28号引物,序列见表1),进行第一轮PCR反应,分别扩增上述3个基因(PCR反应条件首先98℃变性5min;其次98℃变性10sec,55-60℃退火5sec,68℃延伸1-2min,15个循环;最后,68℃再延伸15min),然后以上述PCR产物各1μl为模板,使用23号和28号引物,进行第二轮PCR反应(PCR反应条件首先98℃变性5min;其次98℃变性10sec,55-60℃退火5sec,68℃延伸1-2min,32个循环;最后,68℃再延伸15min),跑1%琼脂糖凝胶电泳后,切胶回收后,即为操纵子A。操纵子B的构建过程类似操纵子A,仅使用不同引物扩增不同基因,第一轮PCR使用29-38号引物分别扩增ERG12、ERG8、MVD1、idi、ispA基因,第二轮使用29号和38号引物。
2.3使用OK Clon DNA连接试剂盒(湖南艾科瑞生物工程有限公司)具体操作方法见试剂盒说明书,将操纵子A同源重组到pACYCDuet-1载体的多克隆位点1(MCS2)的Sal I位点,将操纵子B同源重组到pACYCDuet-1载体的多克隆位点2的Xho I位点,即获得pACYCDuet-FPP重组质粒。
实施例3 高产β-榄香烯工程菌的构建
3.1用质粒pGEX-4T1或pGEX-4T1-ScGAS与pACYCDuet-1或pACYCDuet-FPP共同转化E.coil BL21(DE3)感受态,涂布LB/Amp&Cm抗性平板,过夜培养后,挑取单克隆使用pGEX-4T1载体上的通用引物M13-F&M13-R和pACYCDuet-1载体上的通用引物Cm-F&Cm-R(3-6号引物,序列见表1)进行菌落PCR鉴定,阳性克隆即分别为pGEX-4T1/pACYCDuet-FPP/BL21、pGEX-4T1-ScGAS/pACYCDuet-FPP/BL21、pGEX-4T1-ScGAS/pACYCDuet-1/BL21、pGEX-4T1/pACYCDuet-1/BL21重组菌株。
3.2上述步骤3.1获得的4种重组菌株分别接种到至含Amp&Cm抗生素的2mL液体LB培养基中,37℃恒温震荡培养箱中180rpm过夜培养。第二天以1:50的比例扩 接至50mL含Amp&Cm抗生素的液体LB培养基中,37℃恒温震荡培养箱中继续培养至菌液浓度A600约为2,加入10μL浓度为0.5M的IPTG及10ml的正十二烷溶液,28℃恒温震荡培养箱内,180rpm培养48h。将发酵液冷却至室温,等体积分装至3个50mL离心管内,再在每个离心管内加入20mL乙酸乙酯,用封口膜封口震荡混匀抽提,并超声5分钟;室温下12000rpm离心10min,收集上清液至圆底烧瓶;在28℃,50rpm的旋转蒸发仪上旋至无乙酸乙酯,收集正十二烷;加入适量无水Na
2SO
4去除有机相内水分,再次离心收集上清,即为发酵产物。
3.3将步骤3.2发酵产物用0.22μm有机滤膜过滤,并用乙酸乙酯稀释200倍,加入终浓度为20mg/L乙酸壬酯为内参,样品使用GC-MS检测,通过β-榄香烯与内参的峰面积比值,计算β-榄香烯的含量(如图2所示)。GC-MS检测条件:石英毛细管柱HP-5MS(30m×0.25mm×0.25μm);升温程序:80℃,停留3min;10℃/min升至210℃,停留1min。载气:高纯氦气,流量设置为1mL/min;进样口及接口温度分别设置为250℃与280℃;进样量1μL;离子源EI;电子能量70eV;离子源温度250℃;扫描质量范围35~550amu;溶剂延迟6.5min。
结果表明,只表达pGEX-4T1-ScGAS的重组菌中β-榄香烯的产量为49.21mg/L(图2,ScGAS B),而共同表达pGEX-4T1-ScGAS和pACYCDuet-FPP的重组菌中β-榄香烯的产量为146.88mg/L(图2,ScGAS D),产量提高了2.98倍。因此,共同表达pGEX-4T1-ScGAS和pACYCDuet-FPP的重组菌可作为β-榄香烯的量产的工程菌株。
实施例4 高产β-榄香烯工程菌的发酵条件优化
活化步骤3.1中获得的pGEX-4T1-ScGAS/pACYCDuet-FPP/BL21工程菌进行发酵条件优化。影响发酵产物产量的主因素包括IPTG添加时菌的浓度、培养温度、IPTG使用浓度及诱导时长,分别选择3个不同的实验条件(如表2所示)设计L
9(3
4)正交实验表(如表3所示),并使用正交实验的极差分析法分析4个因素对β-榄香烯产量的影响。按照方法3.2制备待检测样,使用3.3方法检测样品中β-榄香烯的含量变化,并计算和评估各因素对β-榄香烯产量的影响。
通过正交实验的极差分析法确定的各因素对β-榄香烯产量的主次关系结果如表4所示,不同发酵条件下,β-榄香烯产量如图3所示,最终确定发酵条件为重组菌的A600为0.5时添加IPTG,IPTG的终浓度为0.1mM,在28℃摇瓶发酵72h时,β-榄香烯的产量达到156.94mg/L。
表2.正交因素水平
表3.正交实验条件
表4.β-榄香烯的产量与各因素的关系表
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。
Claims (10)
- 一种产β-榄香烯的重组菌,其特征在于,所述重组菌表达吉玛烯A合酶ScGAS、乙酰乙酰辅酶A硫解酶atoB、3-羟基-3-甲基戊二酰辅酶A合酶ERG13、截短的3-羟基-3-甲基戊二酰辅酶A还原酶tHMG1、甲羟戊酸激酶ERG12、磷酸甲羟戊酸激酶ERG8、焦磷酸甲羟戊酸脱羧酶MVD1、焦磷酸异戊烯脂异构酶idi和法呢烯基焦磷酸合酶ispA。
- 根据权利要求1所述的重组菌,其特征在于,所述吉玛烯A合酶ScGAS的氨基酸序列如SEQ ID NO.2所示。
- 根据权利要求1所述的重组菌,其特征在于,所述吉玛烯A合酶ScGAS的核苷酸序列如SEQ ID NO.1所示或如SEQ ID NO.3所示,乙酰乙酰辅酶A硫解酶atoB的核苷酸序列如SEQ ID NO.4所示,3-羟基-3-甲基戊二酰辅酶A合酶ERG13的核苷酸序列如SEQ ID NO.5所示、截短的3-羟基-3-甲基戊二酰辅酶A还原酶tHMG1的核苷酸序列如SEQ ID NO.6所示、甲羟戊酸激酶ERG12的核苷酸序列如SEQ ID NO.7所示、磷酸甲羟戊酸激酶ERG8的核苷酸序列如SEQ ID NO.8所示、焦磷酸甲羟戊酸脱羧酶MVD1的核苷酸序列如SEQ ID NO.9所示,焦磷酸异戊烯脂异构酶idi的核苷酸序列如SEQ ID NO.10所示、法呢烯基焦磷酸合酶ispA的核苷酸序列如SEQ ID NO.11所示。
- 根据权利要求1所述的重组菌,其特征在于,所述吉玛烯A合酶ScGAS的表达载体为pGEX-4T1载体;所述乙酰乙酰辅酶A硫解酶atoB、3-羟基-3-甲基戊二酰辅酶A合酶ERG13、截短的3-羟基-3-甲基戊二酰辅酶A还原酶tHMG1、甲羟戊酸激酶ERG12、磷酸甲羟戊酸激酶ERG8、焦磷酸甲羟戊酸脱羧酶MVD1、焦磷酸异戊烯脂异构酶idi和法呢烯基焦磷酸合酶ispA的表达载体为pACYCDuet-1载体。
- 根据权利要求4所述的重组菌,其特征在于,所述乙酰乙酰辅酶A硫解酶atoB、3-羟基-3-甲基戊二酰辅酶A合酶ERG13、截短的3-羟基-3-甲基戊二酰辅酶A还原酶tHMG1的基因连接到pACYCDuet-1的多克隆位点MCS1,所述甲羟戊酸激酶ERG12、磷酸甲羟戊酸激酶ERG8、焦磷酸甲羟戊酸脱羧酶MVD1、焦磷酸异戊烯脂异构酶idi和法呢烯基焦磷酸合酶ispA的基因连接到pACYCDuet-1的多克隆位点MCS2。
- 权利要求4或5所述的重组菌的构建方法,其特征在于,主要包括以下步骤:(1)将吉玛烯A合酶ScGAS基因连接到pGEX-4T1载体中,转化感受态细胞,挑取阳性克隆,提取重组质粒pGEX-4T1-ScGAS;(2)将乙酰乙酰辅酶A硫解酶atoB基因、3-羟基-3-甲基戊二酰辅酶A合酶ERG13 基因、截短的3-羟基-3-甲基戊二酰辅酶A还原酶tHMG1基因、甲羟戊酸激酶ERG12基因、磷酸甲羟戊酸激酶ERG8基因、焦磷酸甲羟戊酸脱羧酶MVD1基因、焦磷酸异戊烯脂异构酶idi基因和法呢烯基焦磷酸合酶ispA基因连接到pACYCDuet-1载体中,转化感受态细胞,挑取阳性克隆,提取重组质粒pACYCDuet-FPP;(3)将步骤(1)所得的pGEX-4T1-ScGAS重组质粒和步骤(2)所得的pACYCDuet-FPP共同转化感受态细胞,挑取阳性克隆即得产β-榄香烯的重组菌株。
- 根据权利要求6所述的构建方法,其特征在于,步骤(3)中的感受态细胞为E.coil BL21(DE3)。
- 利用权利要求1-5任一项所述的重组菌生产β-榄香烯的方法,其特征在于,主要包括以下步骤:(1)在转速50~300rpm,温度20~32℃的培养条件下,培养权利要求1-5任一项所述的重组菌,待重组菌液浓度A 600为0.2~2时,加入IPTG诱导剂至终浓度为0.01~1.0mM,继续培养至12-120h;(2)使用有机溶剂萃取发酵液中的β-榄香烯,离心收集有机相,即得。
- 根据权利要求8所述的方法,其特征在于,所述培养的培养基为液体LB培养基。
- 根据权利要求8或9所述的方法,其特征在于,所述有机溶剂为乙酸乙酯、己烷、石油醚或氯仿中的一种或2种以上的混合物,所述有机溶剂与发酵液的体积比2:1~1:20。
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