CN108864023B - 一种制备高纯度木犀草素的方法 - Google Patents
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- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
- C07D311/22—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4
- C07D311/26—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3
- C07D311/28—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 2 only
- C07D311/30—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3 with aromatic rings attached in position 2 only not hydrogenated in the hetero ring, e.g. flavones
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
- C07D311/22—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4
- C07D311/26—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 4 with aromatic rings attached in position 2 or 3
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Abstract
一种用三价铁离子溶液与花生壳提取液混合,利用铁离子与黄酮类化合物螯合原理,从提取液中分离纯化木犀草素等黄酮类化合物的方法。其特征在于直接往花生壳提取物溶液里面加入三价铁盐溶液,通过三价铁离子与提取物中木犀草素等黄酮类化合物形成螯合物。分离、溶解螯合物沉淀后,用EDTA与铁螯合,游离出木犀草素,经过乙醇水重结晶获得高纯度木犀草素。本发明的特点是纯化过程简便、使用廉价、无毒试剂、能耗低,是一条简便、绿色、高效的工艺。
Description
技术领域
本发明涉及一种用三价铁离子溶液与花生壳提取液混合,利用铁离子与黄酮类化合物螯合原理,从提取液中分离纯化木犀草素等黄酮类化合物的方法。属于天然化合物提取和分离领域。
背景技术
上世纪60年代,科学家们从银杏叶中提取黄酮,并用于临床以来,也让黄酮作为天然化合物在世界范围得到认可,银杏叶提取物也成为世界上植物提取物消耗最多的种类之一。黄酮类化合物广泛存在自然界的某些植物根、茎、叶中,总数超过4千种。黄酮的功效是多方面的,不同分子结构的黄酮的功效也有很大差别,一般认为黄酮是一种很强的抗氧剂,可有效清除体内的氧自由基,可以阻止细胞的退化、衰老,也可阻止癌症的发生。黄酮可以改善血液循环,可以降低胆固醇也可改善心脑血管疾病的症状。黄酮具有强抗炎性。
木犀草素是一种天然含有4个羟基的黄酮类化合物,主要存在于紫苏叶、金银花、荆芥等天然药材及菜花、胡萝卜等蔬菜中。近来有报道从农业废弃物花生壳中也可以提取木犀草素,并且其含量相当可观。药理研究给出了其与多数黄酮共有的抗氧化、抗炎、抗过敏、抗肿瘤、保护神经系统等多种药理作用,也有报道证明了在体内具有抗菌、抗病毒及降低血脂和胆固醇等作用,和木犀草素临床可以用于呼吸系统炎症性疾病、肿瘤疾病及心血管疾病等的治疗。并在化妆品和保健品等领域作为添加剂也有广泛应用。
从农业废弃物花生壳中提取木犀草素的方法有很多报道。吕圭源等(中国专利申请号201310491385.1)用乙醇水溶液通过微压提取、浓缩、重结晶、柱层析,从花生壳有效部位获得木犀草素纯度达到60%。姜代勋等(中国专利申请号201410646522.9)用水提醇沉法,获得提取物,并利用高效液相色谱制备法,快速从含木犀草素植物如苏叶、金银花等天然药材提取木犀草素。彭国平(中国专利申请号201110026469.9)用乙醇水溶液提取,用热水沉淀,用大孔树脂吸附木犀草素,洗脱分离后得到纯度较高的木犀草素。
以上方法均能给出一定纯度的木犀草素,但是有些过程操作步骤复杂,生产周期较长,并需要复杂操作设备等,应用于工业化规模生产的难度较大,成本高,操作复杂。
黄酮类与金属离子螯合现象屡见报道。木犀草素分子中有四个羟基,能够与三价铁离子形成螯合物,我们利用木犀草素的这个特点,来纯化木犀草素。通过三价铁离子直接与提取液中木犀草素反应,获得木犀草素与三价铁离子的螯合物沉淀。螯合物沉淀分离出来后,溶于EDTA溶液,形成EDTA铁螯合物,把木犀草素游离出来,获得高纯度的木犀草素。
发明内容
本发明的目的是提供一种制备高纯木犀草素的方法,该方法能够简单、迅速、环境友好地从花生壳提取液中获得高纯度木犀草素。
本发明的目的是由以下技术方案实现的:
一种从花生壳的醇水提取液或者花生壳提取物的醇水溶液出发,利用三价铁离子与黄酮类物质螯合原理,获得高纯度木犀草素的方法,其步骤如下:
A.将所用花生壳醇水提取液或者花生壳提取物的醇水溶液直接加入三价铁盐或者其水溶液。所用的金属铁盐,可以选择磷酸铁、硫酸铁、氯化铁、硝酸铁等。铁盐使用量要保证金属盐与木犀草素的摩尔比为1/2-1/5。添加后,螯合反应时间为1-15hr。螯合反应温度为10℃-70℃;过滤分离螯合反应生成的沉淀;
B.将上述的沉淀放入酸性环境中溶解20分钟。酸溶液pH范围控制在2-6;所述的酸溶液可以选择盐酸水溶液、硫酸水溶液、磷酸水溶液、柠檬酸水溶液等;
C.上述酸溶液中加入EDTA溶液,EDTA溶液与上述酸溶液的体积比为1/1-1/3。充分混合后,蒸干溶液,用沉淀10倍量甲醇溶解沉淀,滤液浓缩后得到高纯度木犀草素。
对花生壳的提取液和得到的高纯度木犀草素经高效液相色谱分析得到分析结果,色谱图见附图。采用的色谱条件为:HPLC高效液相色谱仪,色谱柱C18column,250×4.6mm,,5um:流速为1.0mL/min,柱温25℃,检测波长为254nm;流动相为甲醇和水的混合物(体积比为60∶40),提取物的进样体积为20uL。
本发明取得了如下有益成果:
1、对花生壳提取液或者提取物不需要做进一步处理,直接加入三价铁盐,通过调节pH使三价铁盐与提取物中木犀草素螯合,简化处理步骤,节约操作时间、减少能源的消耗,提高了制备效率和经济效益;
2、采用磷酸铁等盐的成本低,无毒无害,危险程度降低,也便于提取溶剂的回收;
3、采用EDTA螯合铁盐游离出木犀草素,能够高效地获得木犀草素粗品;
4、通过乙醇水的重结晶,能够去除粗品中的杂质,获得高纯度的木犀草素,便于纯化木犀草素的工业化大规模生产。
附图说明
图1是未经纯化的花生壳提取液的HPLC谱图。
图2是经过螯合处理后提取液的HPLC谱图。
图3是经过螯合处理纯化的木犀草素样品的HPLC谱图。
具体实施方式:
下面结合附图和具体的实施例对本发明从花生壳提取液为例,制备高纯度木犀草素的方法进一步说明,以便本领域的技术人员更加了解本发明,但是并不以此限制本发明。
实施例1:
A.将100mL的70%乙醇水的花生壳提取液中,直接加入40mg/mL的氯化铁水溶液,添加氯化铁水溶液量保证金属离子与木犀草素的摩尔比为1/3,添加后,螯合反应时间为2hr。螯合反应温度为30℃;过滤分离螯合反应生成的沉淀;
B.将上述的沉淀用pH=4的盐酸溶液溶解20分钟;
C.上述酸溶液中加入5%EDTA溶液,EDTA溶液与上述酸溶液的体积比为1/2。充分混合后,蒸干溶液,用沉淀10倍量甲醇溶解沉淀,滤液浓缩蒸干甲醇后得到木犀草素粗品,用50%乙醇水溶液进行重结晶,纯度达95%。
实施例2:
A.将100mL的70%乙醇水的花生壳提取液中,直接加入20mg/mL的氯化铁水溶液,添加氯化铁水溶液量保证金属离子与木犀草素的摩尔比为1/3,添加后,螯合反应时间为2hr。螯合反应温度为30℃;过滤分离螯合反应生成的沉淀;
B.将上述的沉淀用pH=6的盐酸溶液溶解20分钟;
C.上述酸溶液中加入5%EDTA溶液,EDTA溶液与上述酸溶液的体积比为1/1。充分混合后,蒸干溶液,用沉淀10倍量甲醇溶解沉淀,滤液浓缩蒸干甲醇后得到木犀草素粗品,用50%乙醇水溶液进行重结晶,纯度达92%。
实施例3:
A.将100mL的70%乙醇水的花生壳提取液中,直接加入60mg/mL的氯化铁水溶液,添加氯化铁水溶液量保证金属离子与木犀草素的摩尔比为1/2,添加后,螯合反应时间为5hr。螯合反应温度为60℃;过滤分离螯合反应生成的沉淀;
B.将上述的沉淀用pH=2的盐酸溶液溶解20分钟;
C.上述酸溶液中加入5%EDTA溶液,EDTA溶液与上述酸溶液的体积比为1/1。充分混合后,蒸干溶液,用沉淀10倍量甲醇溶解沉淀,滤液浓缩蒸干甲醇后得到得到木犀草素粗品,用50%乙醇水溶液进行重结晶,纯度达94%。
实施例4:
A.将100mL的70%乙醇水溶解的花生壳提取物溶液中,直接加入40mg/mL的氯化铁水溶液,添加氯化铁水溶液量保证金属离子与木犀草素的摩尔比为1/1,添加后,螯合反应时间为2hr。螯合反应温度为30℃;过滤分离螯合反应生成的沉淀;
B.将上述的沉淀用pH=4的盐酸溶液溶解20分钟;
C.上述酸溶液中加入5%EDTA溶液,EDTA溶液与上述酸溶液的体积比为1/1。充分混合后,蒸干溶液,用沉淀10倍量甲醇溶解沉淀,滤液浓缩蒸干甲醇后得到得到木犀草素粗品,用50%乙醇水溶液进行重结晶,纯度达95%。
实施例5:
A.将100mL的70%乙醇水的花生壳提取液中,直接加入50mg/mL的磷酸铁水溶液,添加磷酸铁水溶液量保证金属离子与木犀草素的摩尔比为1/5,添加后,螯合反应时间为2hr。螯合反应温度为30℃;过滤分离螯合反应生成的沉淀;
B.将上述的沉淀用pH=4的磷酸溶液溶解20分钟;
C.上述酸溶液中加入5%EDTA溶液,EDTA溶液与上述酸溶液的体积比为1/1。充分混合后,蒸干溶液,用沉淀10倍量甲醇溶解沉淀,滤液浓缩蒸干甲醇后得到得到木犀草素粗品,用50%乙醇水溶液进行重结晶,纯度达93%。
实施例6:
A.将100mL的70%乙醇水的花生壳提取液中,直接加入硝酸铁水溶液,添加硝酸铁水溶液量保证金属盐与木犀草素的摩尔比为1/3,螯合反应时间为2hr。螯合反应温度为30℃;过滤分离螯合反应生成的沉淀;
B.将上述的沉淀用pH=4的硫酸溶液溶解20分钟;
C.上述酸溶液中加入5%EDTA溶液,EDTA溶液与上述酸溶液的体积比为1/1。充分混合后,蒸干溶液,用沉淀10倍量甲醇溶解沉淀,滤液浓缩蒸干甲醇后得到得到木犀草素粗品,用50%乙醇水溶液进行重结晶,纯度达92%。
以上所述仅为本发明的较佳实施例,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (1)
1.一种用三价铁离子溶液与花生壳提取液混合,利用铁离子与黄酮类化合物螯合原理,从提取液中分离纯化木犀草素的方法,其特征在于,包括以下步骤:
A、将花生壳醇水提取液或者花生壳提取物的醇水溶液直接加入三价铁盐或者其水溶液,铁盐使用量要保证金属盐与木犀草素的一定的摩尔比;在一定的螯合反应时间和螯合反应温度后,过滤分离螯合反应生成的沉淀;
B、将上述的沉淀放入酸性环境中溶解20分钟,酸溶液pH范围控制在2-6;所述的酸溶液为盐酸水溶液、硫酸水溶液、磷酸水溶液、柠檬酸水溶液;
C、上述酸溶液中加入一定量的EDTA溶液,充分混合后,蒸干溶液,用沉淀10倍量甲醇溶液溶解沉淀,滤液浓缩蒸干后,用50%乙醇水溶液进行重结晶得到高纯度木犀草素;
A步骤中所述的三价铁盐为磷酸铁、硫酸铁、氯化铁、硝酸铁;
A步骤中所述的三价铁盐使用量要保证金属盐与木犀草素的摩尔比为1/2-1/5;
A步骤中所述的螯合反应时间为1-15hr,螯合反应温度为10℃-70℃;
C步骤中加入5%EDTA溶液,EDTA溶液与上述酸溶液的体积比为1/1-1/3。
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