CN106636293B - 一种羟酸酯的手性拆分方法 - Google Patents

一种羟酸酯的手性拆分方法 Download PDF

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CN106636293B
CN106636293B CN201710006612.5A CN201710006612A CN106636293B CN 106636293 B CN106636293 B CN 106636293B CN 201710006612 A CN201710006612 A CN 201710006612A CN 106636293 B CN106636293 B CN 106636293B
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hydroxy acid
racemic
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蔡宇杰
沈天成
曹憬
白亚军
郑晓晖
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Zhuohong Chaoyuan Biotechnology Zhengzhou Co ltd
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    • C12P41/00Processes using enzymes or microorganisms to separate optical isomers from a racemic mixture
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    • C12P41/00Processes using enzymes or microorganisms to separate optical isomers from a racemic mixture
    • C12P41/002Processes using enzymes or microorganisms to separate optical isomers from a racemic mixture by oxidation/reduction reactions
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    • C12P7/00Preparation of oxygen-containing organic compounds
    • C12P7/62Carboxylic acid esters

Abstract

本发明涉及一种采用α‑羟酸氧化酶拆分外消旋α‑羟酸酯的方法,属于生物工程领域。可应用于光学纯α‑羟酸酯的制备。

Description

一种羟酸酯的手性拆分方法
技术领域
本发明公开了一种采用氧化酶拆分α-羟酸酯的方法,属于工业微生物领域。
背景技术
α-羟酸酯(alpha-hydroxy esters)是α-羟酸与醇酯化脱水后得到产物,在医药领域有着广泛的应用,如丹参素与异丙醇脂化后生成的丹参素异丙酯等。
化学合成的外消旋α-羟酸酯常用的酶拆分的方法是采用脂肪酶或酯酶水解方案,如一种酯酶拆分(±)-扁桃酸甲酯的方法(中国专利201510212293.4)、猪胰脂肪酶作水解拆分甘油丁酸酯(缩水甘油丁酸酯的对映选择性酶促水解.华南理工大学学报,1999,25(2):209~212)、Novozym 435对羟基苯甘氨酸甲酯的不对称水解(脂肪酶催化外消旋对羟基苯甘氨酸甲酯水解制备对映体纯D-对羟基苯甘氨酸的新方法.催化学报,2005,26(2):106~110)等。但脂肪酶的立体选择性不高,很难在高回收率下得到99%以上的光学纯产品。
本发明采用α-羟酸氧化酶进行α-羟酸酯的手性拆分,α-羟酸氧化酶家族已知成员有:乳酸氧化酶、乙醇酸氧化酶、扁桃酸氧化酶和长链α-羟酸氧化酶等。这些酶通常被用于外消旋α-羟酸的手性拆分(中国专利201210109290.4)。
发明内容
α-羟酸氧化酶拆分外消旋α-羟酸酯的步骤为:称取外消旋α-羟酸酯加入到反应器中使外消旋α-羟酸酯的初始反应浓度为1-40mM,再加入pH为4-10的反应缓冲液和α-羟酸氧化酶形成反应体系,α-羟酸氧化酶用量为1-100μg/ml,在20-50℃下水浴摇床150r/min振荡,反应时间为1-24小时,α-羟酸氧化酶氧化其对应的α-羟酸酯。按照此方法进行拆分,对映体过量高达到99.9%,产率最高接近50%。
产物(R)-α-羟酸酯的光学纯度通过对映体过量值(%e.e)来评价。
当采用L-α-羟酸氧化酶拆分时,得到光学纯的(R)-α-羟酸酯(D-α-羟酸酯)
对映体过量值%e.e=[(SR-SS)/(SR+SS)]×100%
(R)-α-羟酸酯得率(%)=(SR/S0)×100%
当采用D-α-羟酸氧化酶拆分时,得到光学纯的(S)-α-羟酸酯(L-α-羟酸酯)
对映体过量值%e.e=[(SS-SR)/(SR+SS)]×100%
(S)-α-羟酸酯得率(%)=(SR/S0)×100%
式中SS为反应后(S)-对映体的峰面积,SR为反应后(R)-对映体的液相色谱峰面积,S0为反应前(S)-和(R)-对映体的液相色谱峰面积总和。
产物测定的液相色谱条件为:Chiralcel OD-H手性柱(4.6×250mm),流动相体积比为正己烷:异丙醇:三氟乙酸=80:20:0.1,流速为0.5mL/min,柱温25℃,检测波长210nm,进样量20μL。
所述的α-羟酸酯为下列之一:丹参素冰片酯、丹参素异丙酯、苯乳酸冰片酯、苯乳酸异丙酯、对羟基苯乳酸冰片酯、对羟基苯乳酸异丙酯、扁桃酸冰片酯、扁桃酸异丙酯、丹参素细辛醇酯、乳酸冰片酯、苯乳酸细辛醇酯、对羟基苯乳酸细辛醇酯、乳酸乙醇酯、α-羟基丁酸丙醇酯。所述的α-羟酸酯,可以根据中国专利200610042787.3、201410180490.8、201410175950.8和20140699506.6公布的方法合成。
本发明所用的α-羟酸氧化酶有:L型和D型两类。
L型α-羟酸氧化酶有:鼠肝α-羟酸氧化酶(根据文献制备得到:Aliphatic l-α-hydroxyacid oxidase from rat livers purification and properties.Biochimica etBiophysica Acta(BBA)–Enzymology,1968,167:9-22),鸡肝α-羟酸氧化酶(根据文献制备得到:Purification and some characteristics of chicken liver L-2-hydroxyacidoxidase A.FEBS Lett.1990,266:183-6),Pediococcus sp.乳酸氧化酶(购自sigma),Aerococcus viridans乳酸氧化酶(购自日本Asahi Kasei Pharma Corporation),Lactococcus lacti乳酸氧化酶(根据文献制备得到:Gene cloning,purification,andcharacterization of a lactate oxidase from Lactococcus lactis subsp.cremorisIFO3427,Journal of Fermentation and Bioengineering,1998,85(5),507-510)。
D型α-羟酸氧化酶有:Archaeoglobus fulgidus乳酸氧化酶(根据文献制备得到:Cellular localization of D-lactate dehydrogenase and NADH oxidase fromArchaeoglobus fulgidus,Archaea.2002;1(2):95-104),Sulfolobus tokodaii乳酸氧化酶(根据文献制备得到:A novel flavin adenine dinucleotide(FAD)containing d-lactate dehydrogenase from the thermoacidophilic crenarchaeota Sulfolobustokodaii strain 7:purification,characterization and expression in Escherichiacoli.J Biosci Bioeng.2008,106(1):16-21),
本发明的有益之处:本专利所指的氧化酶均以FAD或FMN为辅酶,与以NAD或NADP为辅酶的羟酸脱氢酶或乳酸脱氢酶相比,逆反应极微弱,无论提取的酶液或α-羟酸氧化酶的基因工程菌全细胞均适用于规模化制备手性纯α-羟酸酯。同时该方法解决了脂肪酶水解拆分法光学选择性差的缺点,具有重要的工业应用价值。
具体实施方式
实施例1
配制5ml反应体系,外消旋丹参素异丙酯浓度为40mM,L型鼠肝α-羟酸氧化酶浓度为100μg/ml,pH6,30℃水浴摇床150r/min振荡24小时,测定(R)-丹参素异丙酯的对映体过量为99.9%,产率为49.9%。
实施例2
配制5ml反应体系,外消旋丹参素冰片酯浓度为1mM,L型鸡肝α-羟酸氧化酶浓度为1μg/ml,pH7,35℃水浴摇床150r/min振荡1小时,测定(R)-丹参素冰片酯的对映体过量为85.2%,产率为36.2%。
实施例3
配制10ml反应体系,外消旋丹参素细辛醇酯浓度为5mM,L型Pediococcus sp.乳酸氧化酶浓度为50μg/ml,pH 8,40℃水浴摇床150r/min振荡12小时,测定(R)-丹参素细辛醇酯的对映体过量为99.7%,产率为49.8%。
实施例4
配制10ml反应体系,外消旋乳酸冰片酯浓度为10mM,L型Aerococcus viridans乳酸氧化酶浓度为5μg/ml,pH 4,40℃水浴摇床150r/min振荡8小时,测定(R)-乳酸冰片酯的对映体过量为73.1%,产率为38.5%。
实施例5
配制5ml反应体系,外消旋苯乳酸冰片酯浓度为20mM,L型Lactococcus lacti乳酸氧化酶浓度为10μg/ml,pH 5,45℃水浴摇床150r/min振荡8小时,测定(R)-苯乳酸冰片酯的对映体过量为95.2%,产率为44.4%。
实施例6
配制5ml反应体系,外消旋苯乳酸异丙酯浓度为30mM,D型Archaeoglobusfulgidus乳酸氧化酶浓度为20μg/ml,pH 6,50℃水浴摇床150r/min振荡4小时,测定(S)-苯乳酸异丙酯的对映体过量为91.9%,产率为40.5%。
实施例7
配制5ml反应体系,外消旋对羟基苯乳酸冰片酯浓度为1mM,D型Sulfolobustokodaii乳酸氧化酶浓度为30μg/ml,pH 7,20℃水浴摇床150r/min振荡2小时,测定(S)-对羟基苯乳酸冰片酯的对映体过量为99.9%,产率为49.9%。
实施例8
配制5ml反应体系,外消旋对羟基苯乳酸异丙酯浓度为5mM,L型鼠肝α-羟酸氧化酶浓度为40μg/ml,pH 8,25℃水浴摇床150r/min振荡4小时,测定(R)-对羟基苯乳酸异丙酯的对映体过量为79.6%,产率为38.9%。
实施例9
配制5ml反应体系,外消旋扁桃酸冰片酯浓度为10mM,L型鸡肝α-羟酸氧化酶浓度为50μg/ml,pH 9,30℃水浴摇床150r/min振荡6小时,测定(R)-扁桃酸冰片酯的对映体过量为99.9%,产率为49.9%。
实施例10
配制5ml反应体系,外消旋扁桃酸异丙酯浓度为20mM,L型Pediococcus sp.乳酸氧化酶浓度为60μg/ml,pH 6,35℃水浴摇床150r/min振荡8小时,测定(R)-扁桃酸异丙酯的对映体过量为99.9%,产率为49.9%。
实施例11
配制5ml反应体系,外消旋苯乳酸细辛醇酯浓度为30mM,L型Aerococcus viridans乳酸氧化酶浓度为100μg/ml,pH 7,40℃水浴摇床150r/min振荡10小时,测定(R)-苯乳酸细辛醇酯的对映体过量为95.9%,产率为46.9%。
实施例12
配制5ml反应体系,外消旋乳酸对羟基苯乳酸细辛醇酯浓度为1mM,L型Lactococcus lacti乳酸氧化酶浓度为30μg/ml,pH 8,45℃水浴摇床150r/min振荡12小时,测定(R)-对羟基苯乳酸细辛醇酯的对映体过量为99.9%,产率为49.9%。
实施例13
配制5ml反应体系,外消旋乳酸乙醇酯浓度为40mM,D型Archaeoglobus fulgidus乳酸氧化酶浓度为30μg/ml,pH 9,50℃水浴摇床150r/min振荡14小时,测定(S)-乳酸乙醇酯的对映体过量为99.9%,产率为49.9%。本实施例中液相测定所用的检测器为视差检测器。
实施例14
配制5ml反应体系,外消旋α-羟基丁酸丙醇酯浓度为1mM,D型Sulfolobustokodaii乳酸氧化酶浓度为20μg/ml,pH 7,30℃水浴摇床150r/min振荡20小时,测定(S)-α-羟基丁酸丙醇酯的对映体过量为99.9%,产率为49.9%。本实施例中液相测定所用的检测器为视差检测器。

Claims (2)

1.一种采用拆分外消旋a-羟酸酯的方法,其特征在于:L-鼠肝a-羟酸氧化酶氧化(S)-a-羟酸酯外消旋丹参素异丙酯和外消旋对羟基苯乳酸异丙酯,L-鸡肝a-羟酸氧化酶氧化(S)-a-羟酸酯外消旋丹参素冰片酯和外消旋扁桃酸冰片酯,L-Pediococcus sp.乳酸氧化酶氧化(S)-a-羟酸酯外消旋丹参素细辛醇酯和外消旋扁桃酸异丙酯,L-Aerococcusviridans乳酸氧化酶氧化(S)-a-羟酸酯外消旋乳酸冰片酯和外消旋苯乳酸细辛醇酯,L-Lactococcus lacti乳酸氧化酶氧化(S)-a-羟酸酯外消旋苯乳酸冰片酯和外消旋乳酸对羟基苯乳酸细辛醇,上述(S)-a-羟酸酯氧化后生成a-酮酸酯,得到光学纯的(R)-a-羟酸酯;D-Archaeoglobus fulgidus乳酸氧化酶氧化(R)-a-羟酸酯外消旋苯乳酸异丙酯和外消旋乳酸乙醇酯,D-Sulfolobus tokodaii乳酸氧化酶氧化(R)-a-羟酸酯外消旋对羟基苯乳酸冰片酯和外消旋a-羟基丁酸丙醇酯,上述(R)-a-羟酸酯氧化后生成a-酮酸酯,得到光学纯的(S)-a-羟酸酯。
2.根据权利要求1所述的方法,拆分外消旋a-羟酸酯的具体步骤如下:称取外消旋a-羟酸酯加入到反应器中使外消旋a-羟酸酯的初始反应浓度为1-40mM,再加入pH为4-10的反应缓冲液和a-羟酸氧化酶形成反应体系,a-羟酸氧化酶用量为1-100pg/ml,在20-50℃下水浴摇床150r/min振荡,反应时间为1-24小时。
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CN102660470B (zh) * 2012-04-13 2013-07-31 浙江工业大学 中华根瘤菌及其生物拆分外消旋α-羟酸生产手性α-羟酸
CN102660624B (zh) * 2012-04-13 2013-10-16 浙江工业大学 α-羟酸去消化的方法及菌株
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