CN113817080A - 一种巯基化壳聚糖及其制备方法 - Google Patents
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Abstract
本发明公开了一种巯基化壳聚糖及其制备方法,为羟丁基和巯基共同改性的壳聚糖。其制备方法包括以下步骤,首先在壳聚糖分子链上引入羟丁基;其次,巯基部分由羟丁基壳聚糖的游离氨基和L‑半胱氨酸的羧基发生缩合反应引入巯基。本发明的巯基化壳聚糖,其水溶液低温下呈溶液状态,可以流动注射,当温度升高到37℃附近时,即可形成水凝胶。由于巯基的引入,增加了材料的抗氧化能力、组织黏附能力。该法制备的巯基化壳聚糖在组织工程、药物递送***、细胞培养和化妆品等方面可能具有广泛的应用前景。
Description
技术领域
本发明属于医用材料技术领域,涉及一种巯基化壳聚糖及其制备方法。
背景技术
壳聚糖是天然多糖中唯一的碱性多糖,广泛应用于食品添加剂、纺织、农业、环保、美容保健、化妆品、抗菌剂、医用纤维、医用敷料、人造组织材料、药物缓释材料、基因转导载体、生物医用领域、医用可吸收材料、组织工程载体材料、医疗以及药物开发等众多领域和其他日用化学工业。羟丁基壳聚糖是壳聚糖的衍生物,具有水溶性和温度响应性。羟丁基壳聚糖水溶液具有温敏性,在低温下呈溶液状态,温度升高,形成凝胶。
然而羟丁基壳聚糖作为一种具有温敏成胶性质的聚合物,在实际应用中受到组织黏附性不够、抗氧化能力差等限制。
发明内容
本发明的目的是提供一种巯基化壳聚糖及其制备方法,该法制备的巯基化壳聚糖具有良好的水溶性和温敏性,在组织工程、药物递送***、细胞培养和化妆品等方面可能具有广泛的应用前景。
根据本发明目的第一方面,本发明采用以下技术方案:
一种巯基化壳聚糖,其特征在于所述的巯基化壳聚糖为羟丁基和巯基共同改性的壳聚糖。所述巯基化壳聚糖可以用下式表达:
根据本发明目的的另一个方面,本发明采用以下技术方案:
一种以上所述的巯基化壳聚糖的制备方法,以壳聚糖为原料,通过先后引入羟丁基、巯基基团合成了一种巯基化壳聚糖,即巯基化羟丁基化壳聚糖HBC-SH,其具体步骤如下:(1)制备羟丁基壳聚糖HBC;(2)将HBC溶于醋酸水溶液,向其中加入1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐EDC.HCl和N-羟基琥珀酰亚胺NHS,室温避光搅拌;随后加入L-半胱氨酸盐酸盐Cys.HCl,室温避光搅拌;调节反应液体的pH至4-6,室温避光反应;(3)反应完毕后,用纯化水避光透析;冷冻干燥所得透析液,得到巯基化壳聚糖。
所述方法的合成步骤也可如下式表示:
进一步地,所述步骤(2)中HBC的浓度为0.01-10%。
进一步地,所述步骤(2)中用1M氢氧化钠调节反应液体的pH至4-6
进一步地,所述步骤(2)中反应时间为4-48h。
如何在保留羟丁基壳聚糖温敏性的同时,赋予其更好的组织黏附性能及抗氧化能力,是本发明所解决的关键问题。L-半胱氨酸是一种生物体内常见的氨基酸,是组成谷胱甘肽的天然成分之一。因其分子中含有活泼的巯基(-SH),对巯基蛋白酶、受毒害的肝实质细胞,具有保护作用,并能刺激造血机能,增加白细胞和促进皮肤损伤的修复。利用L-半胱氨酸将羟丁基壳聚糖转化为含巯基的羟丁基壳聚糖。此巯基化壳聚糖不仅保留了原有羟丁基壳聚糖的温敏性,而且由于巯基的引入增加了材料的抗氧化能力、组织黏附能力。
本发明的巯基化壳聚糖,其水溶液低温下呈溶液状态,可以流动注射,当温度升高到37℃附近时,即可形成水凝胶。本发明不仅可以在生理条件下形成原位凝胶,而且由于巯基的引入,增加了材料的抗氧化能力、组织黏附能力。本方法制备的巯基化壳聚糖在组织工程、药物递送***、细胞培养和化妆品等方面可能具有广泛的应用前景。
以下结合附图和实施例对本发明做出进一步说明。
附图说明
图1是本发明制备的羟丁基和巯基共同改性的壳聚糖HBC-SH溶液温度响应测试照片。
图2是本发明制备的羟丁基和巯基共同改性的壳聚糖HBC-SH溶液还原能力测试结果折线图。
具体实施方式
为了进一步理解本发明,下面结合实施例对本发明提供的,巯基化壳聚糖进行具体描述,但本发明并不限于这些实施例,该领域技术人员在本发明核心指导思想下做出的非本质改进和调整,仍然属于本发明的保护范围。
(一)巯基化壳聚糖的制备
实施例1,制备羟丁基壳聚糖HBC
(1)称取20g壳聚糖,溶于1000ml 1%的HC1水溶液中,过滤,向滤液中滴加1mol/L的NaOH溶液,得沉淀,蒸馏水洗涤至中性,70%乙醇脱盐,95%乙醇脱水,50℃干燥得纯化壳聚糖样品。
(2)取3g纯化后的壳聚糖分散于30ml 50%的NaOH水溶液中,搅拌24h,过滤,挤出多余碱液,得固形物。将所得固形物加入到60ml异丙醇水溶液(V异丙醇:V水=10:10),搅拌均匀,升温至60℃,滴加80ml的1,2-环氧丁烷,反应24h。冷却至室温,向反应液中滴加10%HCl水溶液调节体系pH至中性。滤去不溶物,加入3倍体积乙醇沉淀,离心,沉淀干燥,得羟丁基壳聚糖HBC。
羟丁基壳聚糖HBC的制备也可参照中国专利201110214776.X所公开的制备方法。
实施例2,巯基化壳聚糖HBC-SH的制备
准确称量实施例1制备的HBC 0.5g,溶于100mL 0.05%的醋酸水溶液,向其中加入5mmol的1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐EDC.HCl和N-羟基琥珀酰亚胺NHS,室温避光搅拌0.5h;随后加入5mmol L-半胱氨酸盐酸盐Cys.HCl,室温避光搅拌0.5h;用1M氢氧化钠调节反应液体的pH至5,室温避光反应24h;反应完毕后,用纯化水避光透析3天;冷冻干燥所得透析液,得到巯基化壳聚糖HBC-SH-1。
实施例3,巯基化壳聚糖HBC-SH的制备
准确称量实施例1制备的HBC 0.5g,溶于100mL 0.05%的醋酸水溶液,向其中加入5mmol的1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐EDC.HCl和N-羟基琥珀酰亚胺NHS,室温避光搅拌0.5h;随后加入10mmol L-半胱氨酸盐酸盐Cys.HCl,室温避光搅拌0.5h;用1M氢氧化钠调节反应液体的pH至5,室温避光反应24h;反应完毕后,用纯化水避光透析3天;冷冻干燥所得透析液,得到巯基化壳聚糖HBC-SH-2。
实施例4,巯基化壳聚糖HBC-SH的制备
准确称量实施例1制备的HBC 0.5g,溶于100mL 0.05%的醋酸水溶液,向其中加入5mmol的1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐EDC.HCl和N-羟基琥珀酰亚胺NHS,室温避光搅拌0.5h;随后加入15mmol L-半胱氨酸盐酸盐Cys.HCl,室温避光搅拌0.5h;用1M氢氧化钠调节反应液体的pH至5,室温避光反应24h;反应完毕后,用纯化水避光透析3天;冷冻干燥所得透析液,得到巯基化壳聚糖HBC-SH-3。
(二)温度响应测试
测试方法:称取一定量HBC-SH-2于4℃溶解于纯化水,配置成5%的HBC-SH-2溶液。将该溶液多次置于4℃和37℃下。
结论:结果如图1所示,该溶液在4℃为透明溶液,37℃下成透明凝胶,且该转变随着温度变化具有可逆性,说明该巯基化壳聚糖的水溶液具备温度响应性。
(三)巯基含量测试
测试方法:以L-半胱氨酸盐酸盐Cys.HCl标定的巯基含量为标准曲线,采用Ellman试剂(DTNB)测定巯基化壳聚糖中自由巯基的含量。
结论:结果如下表所示,不同制备方法制备出来的巯基化壳聚糖的巯基含量有一定的差异。
样品编号 | 巯基含量 |
HBC-SH-1 | 0.0951mmol/g |
HBC-SH-2 | 0.1447mmol/g |
HBC-SH-3 | 0.1603mmol/g |
(四)还原能力测试
测试原理:具有还原能力的样品可以使铁***的Fe3+还原成Fe2+(亚铁***),Fe2+(亚铁***)进一步在和三氯化铁的反应下生成在700nm处有最大吸光度的普鲁士蓝{Fe4[Fe(CN)6}3。
测试方法:1)用纯化水配置各浓度的巯基化壳聚糖(HBC-SH-3)样品,分别为0mg/m1,10mg/ml,20mg/m1,50mg/m1,100mg/m1;2)各取1ml各浓度样品于试管中,依次加人2.5ml铁***溶液[K3Fe(CN)6,1%],2.5ml磷酸钠缓冲液(0.2M,pH 6.6),混匀后在50℃保温20min。然后再依次加入2.5m1三氯乙酸(10%)和0.5ml三氯化铁(FeC13,0.1%)。在700nm处测定混合液的光吸收值。
结论:结果如图2所示,不同浓度的巯基化壳聚糖经处理后在700nm处均有吸光值,表明经巯基改性的羟丁基壳聚糖呈现一定的还原能力。
Claims (4)
1.一种巯基化壳聚糖,其特征在于所述的巯基化壳聚糖为羟丁基和巯基共同改性的壳聚糖。
2.权利要求1所述巯基化壳聚糖的制备方法,其特征在于包括以下步骤:(1)制备羟丁基壳聚糖HBC;(2)将HBC溶于醋酸水溶液,向其中加入1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐EDC.HCl和N-羟基琥珀酰亚胺NHS,避光搅拌;随后加入L-半胱氨酸盐酸盐Cys.HCl,避光搅拌;调节反应液体的pH至4-6,避光反应;(3)反应完毕后,用纯化水避光透析;冷冻干燥所得透析液,得到权利要求1所述的巯基化壳聚糖。
3.根据权利要求2所述的制备方法,其特征是所述步骤(2)中HBC的浓度为0.01-10%。
4.根据权利要求2所述的制备方法,其特征是所述步骤(2)中反应时间为4-48h。
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