CN1634001A - 紫草素纳米颗粒及其制备方法 - Google Patents
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Abstract
本发明属于纳米技术及中药制剂技术领域,主要方案是将适量的聚酯(PCL-PEG2000-PCL)和紫草素一起溶于一定体积的丙酮中,再将所得溶液缓慢滴加到高速搅拌的水中,微微加热,冷却后过滤即可形成紫草素纳米颗粒溶液。该紫草素纳米颗粒溶液在体外有缓慢释放的特性,在小鼠体内还有一定的靶向作用。可应用于制备抗肿瘤和保肝护肝的药物。
Description
一.技术领域:本发明属于纳米技术及中药制剂技术领域
二.背景技术:
紫草主要分布于我国新疆、辽宁、湖北、湖南等地区,春秋两季采挖除去茎叶,晒干。紫草作为中药应用已有悠久的历史。它们甘寒清热,专入心肝二经血分,长于凉血活血解毒兼以利尿滑肠。性寒质滑,有轻泄作用。现代研究表明具有显著的抗菌活性,对金黄色葡萄球菌、枯草杆菌和卵黄色八叠菌有抑制作用(田中康雄等药学杂志(日),1972,92,525),具有较强的抗炎作用。临床曾用粗制品治疗传染性肝炎和皮肤病,疗效较好(吉林医科大学中草药通讯,1972(5):42),尤其在治疗糖尿病造成的足部大面积溃疡伤口的愈合上,效果很好。还有抗癌、抗生育、抗甲状腺、抗免疫低下、降血糖、保肝护肝等多种作用。
紫草在中药中多以复方,紫草油形式作为药用。紫草主要成份是紫草素即Shikonin及其衍生物,但是Shikonin很难溶于水,这限制了它的应用。
现代药物治疗学不但要求药物能够以一种预定的速率释放出来,而且要求药物尽可能的浓集到靶向(病灶)部位,从而提高药物的生物利用度和疗效,减少药物的毒副作用。如何使药物达到这个预想的效果,成为当今药物学和药物制剂学的热点和难点。人们期待着更好的、能够解决目前问题的药物问世。载药纳米微粒(Drug-loaded Nanoparticles)正是为解决这两个问题而发展起来的新型载药体系(J.Kreuter,Nanoparticles,in:J.Kreuter(Ed.),Colloidal Drug Delivery Systems,Marcel Dekker,New York,1994,pp.219-342)。被公认为21世纪初关键技术-纳米科技的出现,也为广大药学研究人员提供了另一种改进药物剂型的手段,必将使得药物的应用越来越接近临床的需要,为临床治疗带来可喜的飞跃。
三.发明内容:
本发明需要解决的问题是采用高分子材料将紫草素包埋,形成紫草素纳米颗粒溶液,有利于紫草素的生物利用。
本发明中的材料:
紫草素(Shikonin及其衍生物)和聚酯(PCL-PEG2000-PCL),均由本实验室分别提取、制备。
紫草素纳米颗粒具有纳米颗粒特有的特性,可以均匀地融解在水中,能通过静脉注射,在动物体内有一定的靶向作用。
技术方案:
1.紫草素纳米颗粒的制备
将适量的聚酯(PCL-PEG2000-PCL)和紫草素按照比例8~15∶1,一起溶于一定体积的丙酮中,再将所得溶液缓慢滴加到高速搅拌的20~30ml水中,微微加热在50~60℃,形成紫草素纳米颗粒溶液,冷却后用孔径600nm的滤膜过滤。
2.纳米颗粒形态和粒径分布
将纳米微粒的乳液滴到铜网上,干燥后,用1%的磷钨酸钠溶液染色10分钟。用投射电镜观察纳米颗粒的形态(纳米颗粒的照片见附图1)。用90Plus ParticleSizeAnalyzer测纳米微粒的溶液中纳米颗粒的粒径分布,粒径在100~200nm(粒径分布见附图2)。
3.载药纳米颗粒在体外药物释放的研究
取紫草素纳米颗粒溶液,放入浸泡过的透析袋中。再将透析袋置于37℃的PBS(1M)400ml溶液中,定时取出4ml溶液,补回4ml PBS溶液,测量所取出溶液的紫外吸收(实验结果见附图3)。
4.载药纳米颗粒在小鼠体内代谢的初步研究。
将紫草素纳米颗粒溶液浓缩,取1ml该溶液尾静脉注射到小白鼠体内,分别在1小时、4小时后,处死小鼠,取小鼠组织:血、肝、脾、肾、肺、心、脑,放入离心管内,匀浆,然后在55℃条件下用蛋白酶K处理8小时,再加入4ml乙酸乙酯,振荡,离心取上清,挥干乙酸乙酯后用0.6ml甲醇定容。用HPLC测每个组织内紫草素的含量(实验结果见附图4)。
发明效果:
实验制得透明澄清的紫草素纳米颗粒溶液,纳米颗粒的粒径在100~200nm,具有纳米微粒特有的特性,均匀地分散在水中,在体外可以缓慢释放,并通过实验证明了该纳米颗粒溶液静脉注射到小鼠体内后,纳米微粒在小鼠体内有一定的靶向分布。本发明制备的紫草素纳米颗粒可以缓释及靶向分布,使紫草素更好地发挥它的抗肿瘤、保肝护肝的药物作用,可作为制备抗肿瘤、保肝护肝的药物。
四.附图说明
图1紫草素纳米颗粒在透射电镜下的照片
图2紫草素纳米颗粒的粒径分布
图3紫草素纳米颗粒溶液在体外的释放曲线
图4紫草素纳米溶液静脉注射小鼠后在小鼠体内的组织分布
五.具体实施方式:
1.紫草素纳米微粒的制备
将15mg聚酯(PCL-PEG2000-PCL)和1mg紫草素一起溶于2ml的丙酮中,再将所得溶液缓慢滴加到高速搅拌的20ml水中,微微加热至50℃,等溶液冷却后,用孔径600nm的滤膜过滤,滤液即为紫草素纳米颗粒溶液。
2.纳米颗粒形态和粒径分布
将纳米微粒的乳液滴到铜网上,干燥后,用1%的磷钨酸钠溶液染色10分钟。用投射电镜观察纳米颗粒的形态(纳米微粒照片详见附图1)。用90Plus ParticleSizeAnalyzer测纳米微粒的溶液中纳米颗粒的粒径分布(粒径分布详见附图2)。
3.载药纳米颗粒在体外药物释放的研究
将载药纳米颗粒溶液,放入浸泡过的透析袋中。再将透析袋置于37℃的PBS(1M)400ml溶液中,定时取出4ml溶液,补回4ml PBS溶液,测量所取出溶液的紫外吸收(体外释放曲线详见附图3)。
4.载药纳米颗粒在小鼠体内代谢的研究。
将载药纳米颗粒溶液,浓缩至5ml。取1ml该溶液尾静脉注射到小白鼠体内,分别在1小时,4小时后,处死小鼠,取小鼠组织:血、肝、脾、肾、肺、心、脑,放入离心管内,匀浆,然后在55℃条件下用蛋白酶K处理8小时,再加入4ml乙酸乙酯,振荡,离心取上清,挥干乙酸乙酯后用0.6ml甲醇定容。用HPLC测每个组织内紫草素的含量(体内分布详见附图4)。
Claims (3)
1.一种紫草素纳米微粒,其特征是由聚酯及紫草素混合后制备而成。
2.权利要求1中所述的紫草素纳米微粒的制备方法,其特征是将适量的聚酯和紫草素按照比例8~15∶1,一起溶于一定体积的丙酮中,再将所得溶液缓慢滴加到高速搅拌的20~30ml水中,微微加热在50~60℃,形成紫草素纳米颗粒溶液,冷却后用孔径600nm的滤膜过滤。
3.权利要求1中所述紫草素纳米微粒在制备抗肿瘤、保肝护肝药物中的应用。
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109662945A (zh) * | 2017-10-13 | 2019-04-23 | 南京紫源康医药科技有限公司 | 一种含紫草素的微乳及其制备方法 |
CN111528554A (zh) * | 2020-05-06 | 2020-08-14 | 佳木斯大学 | 一种温度敏感缓慢释药的防护性口罩贴及其制备方法 |
CN114642637A (zh) * | 2022-03-09 | 2022-06-21 | 吉林大学 | 一种纯萘醌类化合物纳米粒子及其无载体无表面活性剂的制备方法 |
CN116172992A (zh) * | 2022-12-12 | 2023-05-30 | 吉林大学 | 水相分散的过渡金属离子/紫草素复合纳米粒子及其两相制备方法 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109662945A (zh) * | 2017-10-13 | 2019-04-23 | 南京紫源康医药科技有限公司 | 一种含紫草素的微乳及其制备方法 |
CN111528554A (zh) * | 2020-05-06 | 2020-08-14 | 佳木斯大学 | 一种温度敏感缓慢释药的防护性口罩贴及其制备方法 |
CN114642637A (zh) * | 2022-03-09 | 2022-06-21 | 吉林大学 | 一种纯萘醌类化合物纳米粒子及其无载体无表面活性剂的制备方法 |
CN114642637B (zh) * | 2022-03-09 | 2022-12-30 | 吉林大学 | 一种纯萘醌类化合物纳米粒子及其无载体无表面活性剂的制备方法 |
CN116172992A (zh) * | 2022-12-12 | 2023-05-30 | 吉林大学 | 水相分散的过渡金属离子/紫草素复合纳米粒子及其两相制备方法 |
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