CN117925756A - 一种高纯度柑橘黄酮糖苷的制备方法 - Google Patents
一种高纯度柑橘黄酮糖苷的制备方法 Download PDFInfo
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/44—Preparation of O-glycosides, e.g. glucosides
- C12P19/60—Preparation of O-glycosides, e.g. glucosides having an oxygen of the saccharide radical directly bound to a non-saccharide heterocyclic ring or a condensed ring system containing a non-saccharide heterocyclic ring, e.g. coumermycin, novobiocin
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- C07H17/04—Heterocyclic radicals containing only oxygen as ring hetero atoms
- C07H17/06—Benzopyran radicals
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- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/20—Preparation of compounds containing saccharide radicals produced by the action of an exo-1,4 alpha-glucosidase, e.g. dextrose
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Abstract
本发明公开了一种高纯度柑橘黄酮糖苷的制备方法,采用环糊精糖基转移酶催化柑橘黄酮与糊精之间的糖基转移过程,之后采用糖化酶选择性降解多糖基柑橘黄酮至单糖基柑橘黄酮,随后采用β‑糖苷酶选择性降解反应液中未转化的柑橘黄酮原料,最后通过大孔吸附树脂吸附分离溶液中的单糖基柑橘黄酮。通过该方法制备得到的柑橘黄酮糖苷如葡萄糖基橙皮苷和葡萄糖基柚皮苷,具有较高的纯度,纯度可以达到95%以上。
Description
技术领域
本发明涉及柑橘黄酮糖苷的制备,尤其涉及一种高纯度柑橘黄酮糖苷的制备方法。
背景技术
柑橘黄酮如橙皮苷和柚皮苷,具有抗氧化、强化毛细血管、改善血管通透性、调节胆固醇等功效,但较差的水溶性和生物活性限制了柑橘黄酮的应用范围和功效。而对柑橘黄酮进行糖基化修饰,能够有效提升其水溶性和生物活性,在食品、药品和日化品领域有着广阔的应用前景。如橙皮苷的糖基化修饰产物葡萄糖基橙皮苷、柚皮苷的糖基化修饰产物葡萄糖基柚皮苷,可以作为高端化妆品原料应用于面霜、眼霜、爽肤水等护肤产品中,具有较高的经济价值。
目前,可通过环糊精糖基转移酶催化糊精和柑橘黄酮分子之间的糖基转移反应,制备葡萄糖基橙皮苷和葡萄糖基柚皮苷。但是,如图1所示,环糊精糖基转移酶的催化过程具有可逆性和产物多样性的特征,导致催化产物中除葡萄糖基柑橘黄酮以外还存在未被糖基化修饰的柑橘黄酮底物和连接了多个葡萄糖基的多糖基柑橘黄酮。此外,底物柑橘黄酮水溶性和生物活性均较差,在催化过程中易与葡萄糖基柑橘黄酮形成包含物,对产品的稳定性和生物活性造成影响。而且多糖基柑橘黄酮虽然具备较好的水溶性,但多余的葡萄糖基不具备生物活性,会导致单位重量产品的生物活性下降。因此制备高纯度的柑橘黄酮糖苷,对提升柑橘黄酮类产品的稳定性和生物活性具有重要意义。
发明内容
为解决上述问题,本发明提供了一种高纯度柑橘黄酮糖苷的制备方法,通过该方法制备得到的柑橘黄酮如葡萄糖基橙皮苷和葡萄糖基柚皮苷,具有较高的纯度。
本发明解决上述问题的技术方案如下:
一种高纯度柑橘黄酮糖苷的制备方法,包括以下步骤:
S1、以柑橘黄酮和糊精为底物,以环糊精糖基转移酶作为催化剂,获得含柑橘黄酮、单糖基柑橘黄酮、多糖基柑橘黄酮的催化液;
S2、向步骤S1的催化液中加入糖化酶,得到含柑橘黄酮、单糖基柑橘黄酮的催化液;
S3、向步骤S2的催化液中加入β-糖苷酶,得到处理后催化液;
S4、将步骤S3的处理后催化液用大孔吸附树脂分离,得到高纯度柑橘黄酮糖苷。
作为优选,所述柑橘黄酮为橙皮苷/柚皮苷,所述糊精为麦芽糊精,所述高纯度柑橘黄酮糖苷为高纯度葡萄糖基橙皮苷/葡萄糖基柚皮苷。
作为优选,所述环糊精糖基转移酶来源于嗜碱芽孢杆菌(Bacillus sp.),所述环糊精糖基转移酶的核苷酸序列如SEQ ID NO.1所示,所述环糊精糖基转移酶的氨基酸序列如SEQ ID NO.2所示。
作为优选,所述糖化酶来源于米曲霉(Aspergillus oryzae)。
作为优选,所述β-糖苷酶来源于焦热球菌(Pyrococcus furiosus),所述β-糖苷酶的核苷酸序列如SEQ ID NO.3所示,所述β-糖苷酶的氨基酸序列如SEQ ID NO.4所示。
作为优选,所述大孔吸附树脂选自型号为XR919C、XAD-4、XAD-16、HP20中的一种或多种。
作为优选,步骤S1中温度为30~50℃,pH为8.5~11.5,柑橘黄酮质量浓度为3~7%,糊精质量浓度为6~14%,含所述环糊精糖基转移酶的湿菌体质量浓度为0.5~1.5%。
作为优选,步骤S2中温度为35~55℃,pH为2~6,含所述糖化酶的发酵产物的质量浓度为1%。
作为优选,步骤S3中温度为70~110℃,pH为5.5~8.5,含所述β-糖苷酶的湿菌体的质量浓度为1~3%。
本发明的另一目的,是提供通过上述高纯度柑橘黄酮糖苷的制备方法制备得到的高纯度柑橘黄酮糖苷。
本发明具有以下有益效果:
本发明采用环糊精糖基转移酶催化柑橘黄酮与糊精之间的糖基转移过程,之后采用糖化酶选择性降解多糖基柑橘黄酮至单糖基柑橘黄酮,随后采用β-糖苷酶选择性降解反应液中未转化的柑橘黄酮原料,最后通过大孔吸附树脂分离溶液中的单糖基柑橘黄酮。通过该方法制备得到的柑橘黄酮糖苷如葡萄糖基橙皮苷和葡萄糖基柚皮苷,具有较高的纯度,纯度可以达到95%以上。
附图说明
图1为环糊精糖基转移酶催化柑橘黄酮的糖基化修饰过程图(以橙皮苷为例);
图2为环糊精糖基转移酶催化橙皮苷糖基化修饰后所得样品的液相分析结果图;
图3为环糊精糖基转移酶催化柚皮苷糖基化修饰后所得样品的液相分析结果图;
图4为喷雾干燥所得葡萄糖基橙皮苷样品的液相分析结果图;
图5为喷雾干燥所得葡萄糖基柚皮苷样品的液相分析结果图。
具体实施方式
本具体实施方式仅仅是对本发明的解释,并不是对本发明的限制,本领域技术人员在阅读了本发明的说明书之后所做的任何改变,只要在权利要求书的范围内,都将受到专利法的保护。下述实施例中如无特殊说明所用方法均为常规方法,所用试剂均可从商业途径获得。
实施例1:重组工程菌的构建及环糊精糖基转移酶的异源表达
参考NCBI数据库报道的嗜碱芽孢杆菌(Bacillus sp.)来源的环糊精葡萄糖基转移酶的氨基酸序列(NCBI登录号NO.AAV38118),加入His-tag纯化标签,交由基因合成公司(苏州金唯智生物科技有限公司),经过密码子优化,人工合成环糊精葡萄糖基转移酶编码基因(核苷酸序列为SEQ ID NO.1所示,氨基酸序列为SEQ ID NO.2所示),并克隆到表达载体pET22b的NcoI/BamHI之间,获得重组质粒pET22b-CGTase。
将重组质粒转化到表达宿主E.coli BL21(DE3)中,具体操作如下:取2μL重组质粒,加入到100μL的E.coli BL21(DE3)感受态细胞中,轻弹管壁数下混匀,在冰水浴中放置30min。42℃热激45s,冰水孵育3min。加入900μL不含抗生素的LB培养基,37℃孵育60min使其抗性复苏。5000rpm离心2min,将菌体浓缩至100μL,均匀涂布在含有50μg/mL氨苄青霉素的LB平板上。将平板倒置,于37℃过夜培养。
阳性克隆转化子的鉴定。在长有重组子的平板上,直接挑取6个单菌落至含有50μg/mL氨苄青霉素的LB液体培养基里,在37℃培养过夜。利用生工生物工程(上海)有限公司的SanPrep柱式质粒提取试剂盒,提取质粒,并酶切验证和测序验证,最终得到含有的重组质粒的阳性克隆子。
将阳性克隆子接种在含有50μg/mL氨苄青霉素的LB液体培养基上进行复苏,37℃,200rpm的摇床中过夜培养10h后,以体积浓度5%的接种量转接至新鲜的含有50μg/mL氨苄青霉素的新鲜LB液体培养基中,37℃,200rpm的摇床中培养3h;以体积浓度5%的接种量接种到含50mg/L氨苄青霉素的发酵培养基中,37℃培养5h,然后降低发酵温度至22℃,以3g/h/L起始发酵培养基的速率补加甘油,再以5.4g/h/L起始发酵培养基的速率补加乳糖,其中甘油共补加15h,乳糖共补加5h,22℃继续发酵16h,得到含环糊精糖基转移酶的发酵液,其湿菌体含量约为40g/L。
实施例2:通过米曲霉的固态发酵制备糖化酶
按质量百分数称取麸皮10%,豆饼粉3%,水87%,混合后置于121℃环境下加热30min后冷却至室温获得固态发酵培养基,之后接入米根霉孢子液,接种量为1%,随后置于28℃环境下培养3天获得固态发酵产物,并将发酵产物置于45℃真空干燥箱中干燥处理,固态发酵过程中需对培养基进行翻扒。
进一步对固态发酵产物进行糖化酶酶活检测,在100g/L麦芽糊精溶液中加入5g/L固态发酵产物,在45℃,pH=4.0的条件下催化1h后采用DNS法测定溶液中还原糖的生成速率,约为6.75g/L/h,对应酶活为12.5U/g。同时检测所得糖化酶的催化选择性,将5g/L固态发酵产物加入至10g/L葡萄糖基橙皮苷溶液中,在45℃,pH=4.0的条件下催化1h后液相检测葡萄糖基橙皮苷浓度不变,确保所得糖化酶不具备降解目标产物葡萄糖基橙皮苷的能力。
实施例3:重组工程菌的构建及β-糖苷酶的异源表达
参考NCBI数据库报道的焦热球菌(Pyrococcus furiosus)来源的β-糖苷酶的氨基酸序列(NCBI登录号WP_011011185),交由基因合成公司(苏州金唯智生物科技有限公司),经过密码子优化,人工合成β-糖苷酶编码基因(核苷酸序列为SEQ ID NO.3所示,氨基酸序列为SEQ ID NO.4所示),并克隆到表达载体pET28a(+)的NcoI/BamHI之间,获得重组质粒pET28a(+)-BgaS。
将重组质粒转化到表达宿主E.coli BL21(DE3)中,具体操作如下:取2μL重组质粒,加入到100μL的E.coli BL21(DE3)感受态细胞中,轻弹管壁数下混匀,在冰水浴中放置30min。42℃热激45s,冰水孵育3min。加入900μL不含抗生素的LB培养基,37℃孵育60min使其抗性复苏。5000rpm离心2min,将菌体浓缩至100μL,均匀涂布在含有50μg/mL卡那霉素的LB平板上。将平板倒置,于37℃过夜培养。
阳性克隆转化子的鉴定。在长有重组子的平板上,直接挑取6个单菌落至含有50μg/mL卡那霉素的LB液体培养基里,在37℃培养过夜。利用生工生物工程(上海)有限公司的SanPrep柱式质粒提取试剂盒,提取质粒,并酶切验证和测序验证,最终得到含有的重组质粒的阳性克隆子。
将阳性克隆子接种在含有50μg/mL卡那霉素的LB液体培养基上进行复苏,37℃,200rpm的摇床中过夜培养12h后,以体积浓度2%的接种量转接至新鲜的含有50μg/mL卡那霉素的新鲜LB液体培养基中,37℃,200rpm的摇床中培养4h;以体积浓度5%的接种量接种到含50mg/L卡那霉素的发酵培养基中,37℃培养4h,然后降低发酵温度至24℃,以2.85g/h/L起始发酵培养基的速率补加甘油,再以2.5g/h/L起始发酵培养基的速率补加乳糖,其中甘油共补加14h,乳糖共补加8h,24℃继续发酵19h,得到含β-糖苷酶的发酵液,其湿菌体含量约为40g/L。
实施例4:催化制备葡萄糖基橙皮苷溶液
将按实施例1所述方法获得的含环糊精糖基转移酶的发酵液用于催化橙皮苷的糖基化修饰,催化过程如下:取50mL水中分别加入10%质量浓度的橙皮苷,之后加入20%质量浓度的糊精得到底物溶液,滴加2mol/L的NaOH溶液将pH调至10.0。将发酵液稀释至湿菌体质量浓度为2%后,滴加2mol/L的NaOH溶液将pH调至10.0。将底物溶液和发酵液按1:1体积比混合,在40℃的恒温水浴磁力搅拌器中催化16h,得到含葡萄糖基橙皮苷、橙皮苷和多糖基橙皮苷的混合溶液,催化过程以2mol/L的NaOH滴定调节pH使之维持在10.0。所得溶液的液相分析结果如图2所示。HPLC-UV检测条件如下:色谱柱为ODS InertSustainC18;流动相为乙腈/水(20:80v/v),含0.1%的三氟乙酸,流速1mL/min,吸收波长283nm,进样体积为10μL,从图2可以看出,催化液中除葡萄糖基橙皮苷外还含有多糖基橙皮苷和橙皮苷杂质。
之后使用2mol/L的盐酸将溶液pH调节至4.0,并向溶液中加入5g/L如实施例2中所述的固态发酵物,在45℃条件下催化24h,催化过程以2mol/L盐酸滴定调节pH使之维持在10.0。该过程可将多糖基橙皮苷降解至葡萄糖基橙皮苷。
之后使用2mol/L的NaOH将溶液pH调节至5.5,将实施例3中所述的含β-糖苷酶的发酵液稀释至湿菌体质量浓度为4%后滴加2mol/L的NaOH溶液将pH调至5.5,将溶液和发酵液按1:1体积比混合,在90℃条件下催化24h后冷却至室温,催化过程以2mol/L的NaOH滴定调节pH使之维持在5.5。该过程可将橙皮苷降解至橙皮素。
实施例5:催化制备葡萄糖基柚皮苷溶液
将按实施例1所述方法获得的含环糊精糖基转移酶的发酵液用于催化柚皮苷的糖基化修饰,催化过程如下:取50mL水中分别加入质量浓度为10%的柚皮苷,之后加入质量浓度为20%的糊精得到底物溶液,将溶液升温至90℃,待底物溶解后冷却至室温,使用2mol/L的NaOH溶液将pH调至7.0。将发酵液稀释至湿菌体质量浓度为2%后滴加2mol/L的NaOH溶液将pH调至7.0。将底物溶液和发酵液按1:1体积比混合,在40℃的恒温水浴磁力搅拌器中催化16h,得到含葡萄糖基柚皮苷、柚皮苷和多糖基柚皮苷的混合溶液,催化过程以2mol/L的NaOH滴定调节pH使之维持在7.0。所得溶液的液相分析结果如图3所示。HPLC-UV检测条件如下:色谱柱为ODS InertSustain C18;流动相为乙腈/水(20:80v/v),含0.1%的三氟乙酸,流速1mL/min,吸收波长283nm,进样体积为10μL,从图3可以看出,催化液中除葡萄糖基柚皮苷外还含有多糖基柚皮苷和柚皮苷杂质。
之后使用2mol/L的盐酸将溶液pH调节至4.0,并向溶液中加入5g/L如实施例2中所述的固态发酵物,在45℃条件下催化24h,催化过程以2mol/L盐酸滴定调节pH使之维持在4.0。该过程可将多糖基柚皮苷降解至葡萄糖基柚皮苷。
之后使用2mol/L的NaOH将溶液pH调节至5.5,将实施例3中所述的含β-糖苷酶的发酵液稀释至湿菌体质量浓度为4%后滴加2mol/L的NaOH溶液将pH调至5.5,将溶液和发酵液按1:1体积比混合,在90℃条件下催化24h后冷却至室温,催化过程以2mol/L的NaOH滴定调节pH使之维持在5.5。该过程可将柚皮苷降解至柚皮素。
实施例6:通过树脂吸附制备高纯度葡萄糖基柑橘黄酮
对实施例4和实施例5中最终溶液进行柱吸附处理。选用逊尔化工XR919C树脂,树脂用量为400g/L催化液,上样流速为0.5BV/h。上样结束后使用20%乙醇溶液进行洗涤,洗涤体积为6BV,流速为1BV/h。洗涤结束后使用30%的乙醇溶液进行洗脱,洗脱体积为4BV,流速为1BV/h。得到高纯度葡萄糖基橙皮苷和葡萄糖基柚皮苷溶液,将样品真空浓缩除去乙醇后喷雾干燥可获得高纯度葡萄糖基橙皮苷和葡萄糖基柚皮苷产品,产品液相分析结果如图4和图5所示,HPLC-UV检测条件如下:色谱柱为ODS InertSustain C18;流动相为乙腈/水(20:80v/v),含0.1%的三氟乙酸,流速1mL/min,吸收波长283nm,进样体积为10μL。从图4和图5可以看出,最终得到了高纯度葡萄糖基橙皮苷和葡萄糖基柚皮苷。
Claims (10)
1.一种高纯度柑橘黄酮糖苷的制备方法,其特征在于,包括以下步骤:
S1、以柑橘黄酮和糊精为底物,以环糊精糖基转移酶作为催化剂,获得含柑橘黄酮、单糖基柑橘黄酮、多糖基柑橘黄酮的催化液;
S2、向步骤S1的催化液中加入糖化酶,得到含柑橘黄酮、单糖基柑橘黄酮的催化液;
S3、向步骤S2的催化液中加入β-糖苷酶,得到处理后催化液;
S4、将步骤S3的处理后催化液用大孔吸附树脂分离,得到高纯度柑橘黄酮糖苷。
2.根据权利要求1所述的一种高纯度柑橘黄酮糖苷的制备方法,其特征在于,所述柑橘黄酮为橙皮苷/柚皮苷,所述糊精为麦芽糊精,所述高纯度柑橘黄酮糖苷为高纯度葡萄糖基橙皮苷/葡萄糖基柚皮苷。
3.根据权利要求1所述的一种高纯度柑橘黄酮糖苷的制备方法,其特征在于,所述环糊精糖基转移酶来源于嗜碱芽孢杆菌(Bacillus sp.),所述环糊精糖基转移酶的核苷酸序列如SEQ ID NO.1所示,所述环糊精糖基转移酶的氨基酸序列如SEQ ID NO.2所示。
4.根据权利要求1所述的一种高纯度柑橘黄酮糖苷的制备方法,其特征在于,所述糖化酶来源于米曲霉(Aspergillus oryzae)。
5.根据权利要求1所述的一种高纯度柑橘黄酮糖苷的制备方法,其特征在于,所述β-糖苷酶来源于焦热球菌(Pyrococcusfuriosus),所述β-糖苷酶的核苷酸序列如SEQ ID NO.3所示,所述β-糖苷酶的氨基酸序列如SEQ ID NO.4所示。
6.根据权利要求1所述的一种高纯度柑橘黄酮糖苷的制备方法,其特征在于,所述大孔吸附树脂选自型号为XR919C、XAD-4、XAD-16、HP20中的一种或多种。
7.根据权利要求1所述的一种高纯度柑橘黄酮糖苷的制备方法,其特征在于,步骤S1中温度为30~50℃,pH为8.5~11.5,柑橘黄酮质量浓度为3~7%,糊精质量浓度为6~14%,含所述环糊精糖基转移酶的湿菌体质量浓度为0.5~1.5%。
8.根据权利要求1所述的一种高纯度柑橘黄酮糖苷的制备方法,其特征在于,步骤S2中温度为35~55℃,pH为2~6,含所述糖化酶的发酵产物的质量浓度为1%。
9.根据权利要求5所述的一种高纯度柑橘黄酮糖苷的制备方法,其特征在于,步骤S3中温度为70~110℃,pH为5.5~8.5,含所述β-糖苷酶的湿菌体质量浓度为1~3%。
10.权利要求1~9任一项所述的方法制备得到的高纯度柑橘黄酮糖苷。
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