CN109553648A - 一种壳寡糖的制备及纯化方法 - Google Patents
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Abstract
本发明公开了一种壳寡糖的制备及纯化方法,包括以下步骤:取干燥至恒重的壳聚糖,加入HCl溶液,调节PH值;加入壳聚糖酶液,保温2h~6h,然后沸水浴加热灭酶;在50℃以下旋转蒸发浓缩,然后放入冷冻干燥机中冷冻干燥,得壳寡糖粗提物;将壳寡糖粗提物溶于NH4HCO3溶液,待完全溶解后,用滤膜过滤得壳寡糖溶液;将树脂倒入层析柱中,用NH4HCO3冲洗树脂至树脂压实,将壳寡糖溶液缓慢倒入层析柱中洗脱,收集洗脱液,旋转蒸发浓缩得壳寡糖。本发明优点:采用壳聚糖酶降解壳聚糖制备壳寡糖,并通过凝胶柱层析分离纯化制备单一聚合度的壳寡糖,纯度可达97%以上,所制备得到的壳寡糖具有良好的降血脂活性,保护肝脏的作用,还能够增强机体的抗氧化活性。
Description
技术领域
本发明涉及一种壳寡糖的制备及纯化方法。
背景技术
壳聚糖来源于虾、蟹壳,是由甲壳素在浓碱或脱乙酰酶的作用下,脱去N上的乙酰基获得的,由一定比例的氨基葡萄糖和N-乙酰氨基葡萄糖经β-(1,4)糖苷键连接而成,在食品工业中是一种天然、无毒的保鲜剂、絮凝剂,且可吸附水中镉、汞、铜等重金属离子,但壳聚糖分子量大,不溶于水,不易于被生物体吸收,因此,将壳聚糖降解,获得分子量小、水溶性好、易于人体吸收的壳寡糖就显得十分必要,但是,高纯度的壳寡糖单体难以制备,往往采用壳寡糖混合物进行生物活性评价,限制了壳寡糖生物活动机理的深入研究。
发明内容
发明目的:针对上述问题,本发明的目的是提供一种壳寡糖的制备及纯化方法,获得单一聚合度壳寡糖。
技术方案:一种壳寡糖的制备及纯化方法,包括以下步骤:
步骤一:取干燥至恒重的壳聚糖,配置成底物浓度为1%~10%的溶液,加入HCl溶液,调节PH值至4.1~6.5;
步骤二:加入壳聚糖酶液,在35℃~70℃下保温2h~6h,然后沸水浴加热10min~15min,灭酶;
步骤三:在50℃以下旋转蒸发浓缩,然后放入冷冻干燥机中冷冻干燥2h~18h,得壳寡糖粗提物;
步骤四:将壳寡糖粗提物溶于NH4HCO3溶液,待完全溶解后,用0.2μm~0.3μm的滤膜过滤得壳寡糖溶液;
步骤五:将树脂倒入层析柱中,用NH4HCO3冲洗树脂至树脂压实,将壳寡糖溶液缓慢倒入层析柱中,并用NH4HCO3溶液洗脱,收集洗脱液,旋转蒸发浓缩得壳寡糖。
进一步的,在步骤一中,HCl溶液的物质的量浓度为0.1mol/L。
进一步的,在步骤二中,壳聚糖酶液的加酶量为40U/g~65U/g。
进一步的,在步骤三中,旋转蒸发浓缩后的体积为原体积的1/3。
进一步的,在步骤五中,NH4HCO3溶液的物质的量浓度为0.1mol/L。
有益效果:与现有技术相比,本发明的优点是:采用壳聚糖酶降解壳聚糖制备壳寡糖,并通过凝胶柱层析分离纯化制备单一聚合度的壳寡糖,纯度可达97%以上,所制备得到的壳寡糖具有良好的降血脂活性,同时能够改善脂肪肝症状,具有很好的保护肝脏的作用,此外,还能够增强机体的抗氧化活性。
具体实施方式
下面对本发明的较佳实施例进行详细阐述,以使本发明的优点和特征能更易于被本领域技术人员理解,从而对本发明的保护范围做出更为清楚明确的界定。
一种壳寡糖的制备及纯化方法,包括以下步骤:
步骤一:取干燥至恒重的壳聚糖,配置成底物浓度为1%~10%的溶液,加入物质的量浓度为0.1mol/L的HCl溶液,调节PH值至4.1~6.5;
步骤二:加入壳聚糖酶液,加酶量为40U/g~65U/g,在35℃~70℃下保温2h~6h,然后沸水浴加热10min~15min,灭酶;
步骤三:在50℃以下旋转蒸发浓缩,旋转蒸发浓缩后的体积为原体积的1/3,然后放入冷冻干燥机中冷冻干燥2h~18h,得壳寡糖粗提物;
步骤四:将壳寡糖粗提物溶于NH4HCO3溶液,待完全溶解后,用0.2μm~0.3μm的滤膜过滤得壳寡糖溶液;
步骤五:将树脂倒入层析柱中,用NH4HCO3冲洗树脂至树脂压实,将壳寡糖溶液缓慢倒入层析柱中,并用物质的量浓度为0.1mol/L的NH4HCO3溶液洗脱,收集洗脱液,旋转蒸发浓缩得壳寡糖。
在温度为50℃,PH值为5.6,加酶量为58U/g,底物浓度为3.5%,反应时间为4h时,壳寡糖粗提物中氨基葡萄糖、壳2糖、壳3糖、壳4糖、壳5糖的含量分别为1.23%、12.88%、41.92%、31.02%以及13.01%。
通过提纯后,四个壳寡糖单体:壳2糖、壳3糖、壳4糖、壳5糖的纯度分别为96.1%、97.1%、97.5%以及98.7%。
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对本发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。
Claims (5)
1.一种壳寡糖的制备及纯化方法,其特征在于包括以下步骤:
步骤一:取干燥至恒重的壳聚糖,配置成底物浓度为1%~10%的溶液,加入HCl溶液,调节PH值至4.1~6.5;
步骤二:加入壳聚糖酶液,在35℃~70℃下保温2h~6h,然后沸水浴加热10min~15min,灭酶;
步骤三:在50℃以下旋转蒸发浓缩,然后放入冷冻干燥机中冷冻干燥2h~18h,得壳寡糖粗提物;
步骤四:将壳寡糖粗提物溶于NH4HCO3溶液,待完全溶解后,用0.2μm~0.3μm的滤膜过滤得壳寡糖溶液;
步骤五:将树脂倒入层析柱中,用NH4HCO3冲洗树脂至树脂压实,将壳寡糖溶液缓慢倒入层析柱中,并用NH4HCO3溶液洗脱,收集洗脱液,旋转蒸发浓缩得壳寡糖。
2.根据权利要求1所述的一种壳寡糖的制备及纯化方法,其特征在于:在步骤一中,HCl溶液的物质的量浓度为0.1mol/L。
3.根据权利要求1所述的一种壳寡糖的制备及纯化方法,其特征在于:在步骤二中,壳聚糖酶液的加酶量为40U/g~65U/g。
4.根据权利要求1所述的一种壳寡糖的制备及纯化方法,其特征在于:在步骤三中,旋转蒸发浓缩后的体积为原体积的1/3。
5.根据权利要求1所述的一种壳寡糖的制备及纯化方法,其特征在于:在步骤五中,NH4HCO3溶液的物质的量浓度为0.1mol/L。
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CN112646849A (zh) * | 2020-12-10 | 2021-04-13 | 上海应用技术大学 | 一种微生物源壳寡糖的制备方法 |
CN113293185A (zh) * | 2021-04-02 | 2021-08-24 | 上海应用技术大学 | 一种壳寡糖的制备方法 |
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CN112646849A (zh) * | 2020-12-10 | 2021-04-13 | 上海应用技术大学 | 一种微生物源壳寡糖的制备方法 |
CN112646849B (zh) * | 2020-12-10 | 2024-01-16 | 上海应用技术大学 | 一种微生物源壳寡糖的制备方法 |
CN113293185A (zh) * | 2021-04-02 | 2021-08-24 | 上海应用技术大学 | 一种壳寡糖的制备方法 |
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