CN108410940B - 一种微生物转化法制备达木林b的方法 - Google Patents
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- YHVZKDRAJHNHJX-UDBICBSZSA-N (2s,3r,4s,5s,6r)-2-[(2r,3r,4s,5s,6r)-2-[[(2r,3r,5r,8r,9r,10r,12r,13r,14r,17s)-2,12-dihydroxy-4,4,8,10,14-pentamethyl-17-(6-methylhepta-1,5-dien-2-yl)-2,3,5,6,7,9,11,12,13,15,16,17-dodecahydro-1h-cyclopenta[a]phenanthren-3-yl]oxy]-4,5-dihydroxy-6-(hydroxym Chemical compound O([C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@H]1[C@H](O)C[C@]2(C)[C@H]3C[C@@H](O)[C@H]4[C@@]([C@@]3(CC[C@H]2C1(C)C)C)(C)CC[C@@H]4C(=C)CCC=C(C)C)[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O YHVZKDRAJHNHJX-UDBICBSZSA-N 0.000 title claims abstract description 28
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- BMSPHMYCTYOUPF-SNVBIOCGSA-N (2s,3r,4s,5s,6r)-2-[(2r,3r,4s,5s,6r)-2-[[(2r,3r,5r,8r,9r,10r,12r,13r,14r,17s)-2,12-dihydroxy-4,4,8,10,14-pentamethyl-17-[(2e)-6-methylhepta-2,5-dien-2-yl]-2,3,5,6,7,9,11,12,13,15,16,17-dodecahydro-1h-cyclopenta[a]phenanthren-3-yl]oxy]-4,5-dihydroxy-6-(hyd Chemical compound O([C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@H]1[C@H](O)C[C@]2(C)[C@H]3C[C@@H](O)[C@H]4[C@@]([C@@]3(CC[C@H]2C1(C)C)C)(C)CC[C@@H]4C(/C)=C/CC=C(C)C)[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O BMSPHMYCTYOUPF-SNVBIOCGSA-N 0.000 abstract description 21
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- LTJZMSTVPKBWKB-XUYZQZLKSA-N (2s,3r,4s,5s,6r)-2-[(2r,3r,4s,5s,6r)-2-[[(2r,3r,5r,8r,9r,10r,12r,13r,14r,17s)-2,12-dihydroxy-17-[(2r)-2-hydroxy-6-methylhept-5-en-2-yl]-4,4,8,10,14-pentamethyl-2,3,5,6,7,9,11,12,13,15,16,17-dodecahydro-1h-cyclopenta[a]phenanthren-3-yl]oxy]-4,5-dihydroxy-6 Chemical compound O([C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@H]1[C@H](O)C[C@]2(C)[C@H]3C[C@@H](O)[C@H]4[C@@]([C@@]3(CC[C@H]2C1(C)C)C)(C)CC[C@@H]4[C@](C)(O)CCC=C(C)C)[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O LTJZMSTVPKBWKB-XUYZQZLKSA-N 0.000 abstract description 10
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Abstract
本发明公开了一种微生物转化法制备达木林B的方法,包括孢子和种子制备、微生物转化、转化产物收集和分离纯化。本发明发现,转化原料为绞股蓝皂苷LI时,短刺小克银汉霉AS3.153菌株会将其基本都转化为达木林A;转化原料为绞股蓝皂苷L时,短刺小克银汉霉AS3.153菌株会将其基本都转化为达木林B。绞股蓝皂苷LI、绞股蓝皂苷L的C20位羟基的构型决定了短刺小克银汉霉AS3.153菌株的脱水选择性,短刺小克银汉霉AS3.153菌株对该位置的脱水具有选择性,可以选择性制备达木林A或达木林B,原料利用率高。
Description
技术领域
本发明属于生物医药领域,具体涉及一种微生物转化法制备达木林B的方法。
背景技术
绞股蓝中含有的皂苷成分众多,研究较多、活性较好的有绞股蓝皂苷LVI、XLVI、L、LI、达木林A(DamulinA)和达木林B(DamulinB)。
达木林A和达木林B在绞股蓝生品中的含量极低,为稀有皂苷。绞股蓝经过加热炮制后,达木林A和达木林B的含量会显著升高,这是因为高温导致绞股蓝皂苷LVI、XLVI脱糖基得到绞股蓝皂苷L、LI,再进一步发生C20(21)、C20(22)脱水得到达木林A和达木林B。绞股蓝皂苷LVI、XLVI、L、LI向达木林A和达木林B的转化途径如下所示。
从化学式可知,达木林A和达木林B为双键位置异构体。因为加热脱水缺乏选择性,所以通过加热脱水的方式会同时得到达木林A和达木林B,二者含量比约为1:1。
微生物转化是替代天然产物结构修饰的一种方法。它具有很高的区域选择性、立体选择性和基团选择性,可以完成一些化学方法难以进行的反应,选择性制备特定结构的化合物。
发明内容
本发明目的在于提供一种微生物转化法制备达木林B的方法。
上述目的通过如下技术方案实现:
一种微生物转化法制备达木林B的方法,包括通过如下步骤:
步骤S1,孢子和种子制备:将短刺小克银汉霉AS3.153菌株接种于斜面培养基上,置于28℃恒温培养7d,得到菌丝生长旺盛、孢子丰富的培养物;取适量孢子接入种子瓶,于28℃振荡培养24h,得到种子培养物;
步骤S2,微生物转化:以5%的接种量将种子培养物转至转化瓶,28℃振荡预培养24h后加入绞股蓝皂苷L无菌水溶液,使绞股蓝皂苷L终浓度为0.2g/L,28℃振荡培养96h;
步骤S3,转化产物收集:取转化培养物上清液,用乙酸乙酯萃取,收集乙酸乙酯萃取液,浓缩得到转化产物粗品。
步骤S4,将转化产物粗品上样于正相硅胶柱,硅胶径高比为1:10,拌样硅胶占硅胶总量的1/10,干法装柱,拌硅胶上样;依次用体积比为40:1:2、20:1:2的二氯甲烷/甲醇/丙酮混合溶剂以12BV/h的速度梯度洗脱,分别洗脱8BV、8BV;收集20:1:2二氯甲烷/甲醇/丙酮洗脱7-8BV的洗脱液浓缩干燥得到达木林B。
优选地,斜面培养基为马铃薯蔗糖琼脂培养基,成分为:蔗糖1.5g,琼脂2.0g,马铃薯20g和蒸馏水100ml。
优选地,种子瓶和转化瓶培养基成分为:葡萄糖2.0g,酵母膏0.5g,蛋白胨0.5g,氯化钠0.5g,磷酸氢二钾0.5g和蒸馏水100ml,pH调至8.3。
优选地,培养基均于115℃灭菌30min后使用。
优选地,步骤S1中,短刺小克银汉霉AS3.153菌株接种于斜面培养基之前于4℃保存。
优选地,步骤S1中,用无菌接种环取一环富含孢子的菌丝体,仅将孢子接入种子瓶中。
本发明技术优势:
本发明发现,转化原料为绞股蓝皂苷LI时,短刺小克银汉霉AS3.153菌株会将其基本都转化为达木林A;转化原料为绞股蓝皂苷L时,短刺小克银汉霉AS3.153菌株会将其基本都转化为达木林B。绞股蓝皂苷LI、绞股蓝皂苷L的C20位羟基的构型决定了短刺小克银汉霉AS3.153菌株的脱水选择性,短刺小克银汉霉AS3.153菌株对该位置的脱水具有选择性,可以选择性制备达木林A或达木林B,原料利用率高。
附图说明
图1为实施例1转化产物粗品的HPLC分析结果,上图为对照品溶液色谱图(达木林A、B单体勾兑制备,浓度均为0.1mg/mL),下图为供试品溶液色谱图(转化产物粗品0.5mg溶于适量甲醇制备而成);图2为实施例2转化产物粗品的HPLC分析结果,上图为对照品溶液色谱图(达木林A、B单体勾兑制备,浓度均为0.1mg/mL),下图为供试品溶液色谱图(转化产物粗品0.5mg溶于适量甲醇制备而成)。
具体实施方式
下面结合实施例具体介绍本发明的实质性内容,但本领域技术人员应当知道,不应将本发明的保护范围局限于这些具体实施例。
实施例1:绞股蓝皂苷LI制备达木林A
一种微生物转化法制备达木林A的方法,包括如下步骤:
步骤S1,孢子和种子制备:将4℃保存的短刺小克银汉霉AS3.153菌株接种于斜面培养基上,置于28℃恒温培养7d,得到菌丝生长旺盛、孢子丰富的培养物;用无菌接种环取一环富含孢子的菌丝体,仅将孢子接入种子瓶(250mL三角瓶内装50mL培养基),于28℃振荡培养24h,得到种子培养物;
步骤S2,微生物转化:以5%的接种量将种子培养物转至转化瓶(100mL三角瓶内装20mL培养基),28℃振荡预培养24h后加入绞股蓝皂苷LI无菌水溶液,使绞股蓝皂苷LI终浓度为0.2g/L,28℃振荡培养96h;
步骤S3,转化产物收集:取转化培养物上清液,用乙酸乙酯等体积萃取3次,收集乙酸乙酯萃取液,浓缩至干得到转化产物粗品;
步骤S4,将转化产物粗品上样于正相硅胶柱,硅胶径高比为1:10,拌样硅胶占硅胶总量的1/10,干法装柱,拌硅胶上样(转化产物粗品用甲醇溶解后与拌样硅胶混合均匀、干燥,转化产物粗品与拌样硅胶的质量比1:1);依次用体积比为40:1:2、20:1:2的二氯甲烷/甲醇/丙酮混合溶剂以12BV/h的速度梯度洗脱,分别洗脱8BV、10BV;收集20:1:2二氯甲烷/甲醇/丙酮洗脱9-10BV的洗脱液浓缩干燥得到达木林A;
其中,斜面培养基为马铃薯蔗糖琼脂培养基,成分为:蔗糖1.5g,琼脂2.0g,马铃薯20g和蒸馏水100ml;种子瓶和转化瓶培养基成分为:葡萄糖2.0g,酵母膏0.5g,蛋白胨0.5g,氯化钠0.5g,磷酸氢二钾0.5g和蒸馏水100ml,pH调至8.3。115℃灭菌30min后使用。
经换算,1摩尔绞股蓝皂苷LI可以转化、分离纯化得到0.92摩尔达木林A,转化率在90%以上,达木林A纯度为98.2%。
实施例2:绞股蓝皂苷L制备达木林B
一种微生物转化法制备达木林B的方法,包括如下步骤:
步骤S1,孢子和种子制备:将4℃保存的短刺小克银汉霉AS3.153菌株接种于斜面培养基上,置于28℃恒温培养7d,得到菌丝生长旺盛、孢子丰富的培养物;用无菌接种环取一环富含孢子的菌丝体,仅将孢子接入种子瓶(250mL三角瓶内装50mL培养基),于28℃振荡培养24h,得到种子培养物;
步骤S2,微生物转化:以5%的接种量将种子培养物转至转化瓶(100mL三角瓶内装20mL培养基),28℃振荡预培养24h后加入绞股蓝皂苷L无菌水溶液,使绞股蓝皂苷L终浓度为0.2g/L,28℃振荡培养96h;
步骤S3,转化产物收集:取转化培养物上清液,用乙酸乙酯等体积萃取3次,收集乙酸乙酯萃取液,浓缩至干得到转化产物粗品;
步骤S4,将转化产物粗品上样于正相硅胶柱,硅胶径高比为1:10,拌样硅胶占硅胶总量的1/10,干法装柱,拌硅胶上样(转化产物粗品用甲醇溶解后与拌样硅胶混合均匀、干燥,转化产物粗品与拌样硅胶的质量比1:1);依次用体积比为40:1:2、20:1:2的二氯甲烷/甲醇/丙酮混合溶剂以12BV/h的速度梯度洗脱,分别洗脱8BV、8BV;收集20:1:2二氯甲烷/甲醇/丙酮洗脱7-8BV的洗脱液浓缩干燥得到达木林B;
其中,斜面培养基为马铃薯蔗糖琼脂培养基,成分为:蔗糖1.5g,琼脂2.0g,马铃薯20g和蒸馏水100ml;种子瓶和转化瓶培养基成分为:葡萄糖2.0g,酵母膏0.5g,蛋白胨0.5g,氯化钠0.5g,磷酸氢二钾0.5g和蒸馏水100ml,pH调至8.3。115℃灭菌30min后使用。
经换算,1摩尔绞股蓝皂苷L可以转化、分离纯化得到0.91摩尔达木林B,转化率在90%以上,达木林B纯度为98.5%。
实施例3:高效液相色谱法比较实施例1、2转化产物粗品中达木林A、B含量差异
高效液相色谱分析条件:
色谱仪:LC-20ADXR高压泵;SPD-M20A二极管阵列紫外可见光检测器;CTO-20AC柱温箱;CBM-20A系统控制器;SIL-20ACXR自动进样器;
色谱柱:Agilent ZORBAX Extend-C18(250mm×4.6mm,5μm);
流动相A相:水(含万分之五四氢呋喃);
流动相B相:乙腈(含万分之五四氢呋喃);
洗脱程序:0-3min,20%B相;3-15min,20%→40%B相;15-30min,40%→80%B相;
流速:1.0mL/min;
柱温:30℃;
检测波长:203nm;
进样量:10μL。
图1为实施例1转化产物粗品的HPLC分析结果,上图为对照品溶液色谱图(达木林A、B单体勾兑制备,浓度均为0.1mg/mL),下图为供试品溶液色谱图(转化产物粗品0.5mg溶于适量甲醇制备而成)。图2为实施例2转化产物粗品的HPLC分析结果,上图为对照品溶液色谱图(达木林A、B单体勾兑制备,浓度均为0.1mg/mL),下图为供试品溶液色谱图(转化产物粗品0.5mg溶于适量甲醇制备而成)。
从图1、图2可以看出,转化原料为绞股蓝皂苷LI时,短刺小克银汉霉AS3.153菌株会将其基本都转化为达木林A;转化原料为绞股蓝皂苷L时,短刺小克银汉霉AS3.153菌株会将其基本都转化为达木林B。绞股蓝皂苷LI、绞股蓝皂苷L的C20位羟基的构型决定了短刺小克银汉霉AS3.153菌株的脱水选择性,短刺小克银汉霉AS3.153菌株对该位置的脱水具有选择性,可以选择性制备达木林A或达木林B,原料利用率高。
Claims (6)
1.一种微生物转化法制备达木林B的方法,其特征在于,包括通过如下步骤:
步骤S1,孢子和种子制备:将短刺小克银汉霉AS3.153菌株接种于斜面培养基上,置于28℃恒温培养7d,得到菌丝生长旺盛、孢子丰富的培养物;取适量孢子接入种子瓶,于28℃振荡培养24h,得到种子培养物;
步骤S2,微生物转化:以5%的接种量将种子培养物转至转化瓶,28℃振荡预培养24h后加入绞股蓝皂苷L无菌水溶液,使绞股蓝皂苷L终浓度为0.2g/L,28℃振荡培养96h;
步骤S3,转化产物收集:取转化培养物上清液,用乙酸乙酯萃取,收集乙酸乙酯萃取液,浓缩得到转化产物粗品;
步骤S4,将转化产物粗品上样于正相硅胶柱,硅胶径高比为1:10,拌样硅胶占硅胶总量的1/10,干法装柱,拌硅胶上样;依次用体积比为40:1:2、20:1:2的二氯甲烷/甲醇/丙酮混合溶剂以12BV/h的速度梯度洗脱,分别洗脱8BV、8BV;收集20:1:2二氯甲烷/甲醇/丙酮洗脱7-8BV的洗脱液浓缩干燥得到达木林B。
2.根据权利要求1所述的方法,其特征在于:斜面培养基为马铃薯蔗糖琼脂培养基,成分为:蔗糖1.5g,琼脂2.0g,马铃薯20g和蒸馏水100ml。
3.根据权利要求1所述的方法,其特征在于:种子瓶和转化瓶培养基成分为:葡萄糖2.0g,酵母膏0.5g,蛋白胨0.5g,氯化钠0.5g,磷酸氢二钾0.5g和蒸馏水100ml,pH调至8.3。
4.根据权利要求2或3所述的方法,其特征在于:培养基均于115℃灭菌30min后使用。
5.根据权利要求1所述的方法,其特征在于:步骤S1中,短刺小克银汉霉AS3.153菌株接种于斜面培养基之前于4℃保存。
6.根据权利要求1所述的方法,其特征在于:步骤S1中,用无菌接种环取一环富含孢子的菌丝体,仅将孢子接入种子瓶中。
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