CN106581751B - 一种PELCL/聚己内酯-g-聚乙二醇-REDV电纺纤维膜及制备方法 - Google Patents

一种PELCL/聚己内酯-g-聚乙二醇-REDV电纺纤维膜及制备方法 Download PDF

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CN106581751B
CN106581751B CN201611268194.9A CN201611268194A CN106581751B CN 106581751 B CN106581751 B CN 106581751B CN 201611268194 A CN201611268194 A CN 201611268194A CN 106581751 B CN106581751 B CN 106581751B
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袁晓燕
周芳
任丽霞
赵蕴慧
崔策
文美玲
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Abstract

本发明一种聚乙二醇‑b‑聚(L‑丙交酯‑co‑ε‑己内酯)/聚ε‑己内酯‑g‑聚乙二醇‑REDV共混超细电纺纤维膜及制备方法。聚乙二醇‑b‑聚(L‑丙交酯‑co‑ε‑己内酯)和聚ε‑己内酯‑g‑聚乙二醇‑REDV一起溶于氯仿和N,N‑二甲基甲酰胺以体积比4:1~8:1的混和溶剂中;溶液在流量为0.02~0.10mL/h、电压为12~20kV、接收距离为15~20cm的条件下进行电纺,得到厚度为50~200μm电纺超细纤维膜。该超细纤维膜表面含有REDV小肽,对促进血管内皮细胞粘附和生长作用好;用于包载核酸、蛋白、药物等生物活性物质,且具有控制释放的生物活性物质的能力。用于生物医用材料领域。

Description

一种PELCL/聚己内酯-g-聚乙二醇-REDV电纺纤维膜及制备 方法
技术领域
本发明涉及了一种聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)(PELCL)/聚己内酯-g-聚乙二醇-REDV电纺超细纤维膜及制备方法,属于生物医用材料领域。
背景技术
采用静电纺丝技术在组织工程支架中负载基因蛋白等生物活性物质,可以调控细胞的粘附、增殖和迁移,有利于组织的修复和再生。生物降解性聚丙交酯共聚物聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)(PELCL)、聚ε-己内酯(聚己内酯,PCL)等生物相容性好,力学性能优良。采用静电纺丝技术,制备出超细纤维膜,模拟细胞外基质结构,可作为组织重建的支架材料。精氨酸-谷氨酸-天冬氨酸-缬氨酸(Arg-Glu-Asp-Val,REDV)存在于纤维连接蛋白的III-CS区域,含有该序列的合成肽能够特异性地粘附血管内皮细胞,而较少粘附平滑肌细胞和成纤维细胞,在血管组织工程支架的功能化中具有重要的应用价值。
为促进血管组织工程支架材料表面形成内皮细胞层,一般采用纤维膜表面物理或者化学修饰的方法,在纤维膜表面偶联REDV和RGD等小肽(Ren X,Feng Y,Guo J,Wang H,LiQ,Yang J,Hao X,Lv J,Ma N,Li W.Surface modification and endothelialization ofbiomaterials as potential scaffolds for vascular tissue engineeringapplications.Chemical Society Reviews 2015,44:5680-5742)。例如,通过表面浸涂的方式在PCL电纺纤维膜表面修饰RGD小肽,提高了细胞在纤维膜表面的粘附和铺展(Wang Z,Wang H,Zheng W,Zhang J,Zhao Q,Wang S,Yang Z,Kong D.Highly stable surfacemodifications of poly(ε-caprolactone)(PCL)films by molecular self-assembly topromote cells adhesion and proliferation.Chemical Communications 2011,47:8901-8903)。我们前期研究发现,在PELCL电纺纤维膜表面通过EDS/NHS活化的方法偶联具有特异粘附作用的REDV小肽,可以促进血管内皮细胞的特异性粘附和生长(Zhou F,Jia X,Yang Y,Yang Q,Gao C,Zhao Y,Fan Y,Yuan X Peptide-modified PELCL electrospunmembranes for regulation of vascular endothelial cells.Materials Science andEngineering C 2016,68:623-631)。然而通过表面化学修饰的方法,在包载生物活性物质的电纺纤维膜表面偶联小肽,比如酸、碱或氨解处理,可能会降低生物活性物质的活性,从而增加原料成本。因此,在电纺纤维膜表面改性的同时,保证包载的生物活性物质的活性是十分必要的。
发明内容
本发明的目的在于制备一种聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)(PELCL)/聚ε-己内酯-g-聚乙二醇-REDV电纺超细纤维膜,所述电纺纤维膜可以用于包载核酸、蛋白、药物等生物活性物质,所述电纺超细纤维膜对促进血管内皮细胞粘附和生长作用较好。
本发明的技术方案如下:
一种聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)/聚ε-己内酯-g-聚乙二醇-REDV电纺超细纤维膜(一种PELCL/聚己内酯-g-聚乙二醇-REDV电纺纤维膜),其PELCL和聚ε-己内酯-g-聚乙二醇-REDV的质量比为(5~1):1,超细纤维膜由直径为400~1000nm的超细纤维构成,其厚度为50~200μm。
所述的聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)的数均分子量为(7~20)×104
所述的聚ε-己内酯的数均分子量为(1~5)×104,聚ε-己内酯的分子式为:
式中m=70~420;R1为-CH3或-CH2O(COCH2CH2CH2CH2CH2O)mCO(CH2)5OH。
所述聚乙二醇的数均分子量为(1~5)×103;通式为R1-(CH2CH2O)n-R2,式中n=23~113,R1为与巯基发生反应的活性基团,包括马来酰亚胺基团、吡啶二硫基团或硫醇基团;R2为与氨基发生反应的活性基团,包括琥珀酰亚胺基团、乙酸基团、乙醛基团、异氰酸基团、异氰硫酸基团、丙烯酸基团或硝基酚基团。
本发明的一种聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)/聚ε-己内酯-g-聚乙二醇-REDV电纺超细纤维膜的制备方法,包括以下过程:
(1)聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)和聚ε-己内酯-g-聚乙二醇-REDV一起溶于氯仿和N,N-二甲基甲酰胺以体积比为(4~8):1的混和溶剂中,配制成浓度100~200mg/mL的电纺溶液;其PELCL和聚ε-己内酯-g-聚乙二醇-REDV的质量比为(5~1):1;
(2)将按步骤(1)所得溶液在溶液的流量为0.02~0.10mL/h、电压为12~20kV、接收距离为15~20cm的条件进行电纺,得到厚度为50~200μm的电纺超细纤维膜。
所述聚ε-己内酯-g-聚乙二醇-REDV的制备方法包括步骤:
(1)聚ε-己内酯的氨基化修饰;
(2)聚ε-己内酯-g-聚乙二醇的制备;
(3)聚ε-己内酯-g-聚乙二醇偶联小肽REDV。
上述的聚ε-己内酯-g-聚乙二醇-REDV的制备方法,具体说明如下:
步骤(1)是:
聚ε-己内酯的氨基化修饰:将聚ε-己内酯配成0.3~0.5g/mL的无水二氯甲烷溶液,使用N,N’-羰基二咪唑(CDI)活化羟基基团,按照摩尔比[单端羟基聚ε-己内酯]/[CDI]为1:1(或[双端羟基聚ε-己内酯]/[CDI]为1:2)加入CDI,在N2中室温下搅拌反应24h,然后加入过量乙二胺,室温下搅拌反应48~72h,产物用过量的甲醇沉淀,真空干燥,得到产物聚ε-己内酯的氨基改性物。
步骤(2)是:
聚-己内酯-g-聚乙二醇的制备:将聚-己内酯的氨基改性物配制为溶度为200~300mg/mL的二氯甲烷溶液,按照聚ε-己内酯的氨基改性物中的氨基与双端PEG中R2基团摩尔比为1:1加入双端PEG,室温搅拌均匀6~10h,产物使用乙醇沉淀,得到聚-己内酯-g-聚乙二醇。
步骤(3)是:
聚ε-己内酯-g-聚乙二醇偶联小肽REDV:将聚ε-己内酯-g-聚乙二醇配成溶度为200~300mg/mL的二氯甲烷溶液,按照摩尔比[聚ε-己内酯-g-聚乙二醇]/[REDV]=1:1加入REDV小肽,室温搅拌均匀2~5h,产物使用乙醇沉淀,得到聚ε-己内酯-g-聚乙二醇-REDV小肽。
本发明的优点在于上述聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)/聚ε-己内酯-g-聚乙二醇-REDV电纺超细纤维膜,在电纺过程中,随着溶剂的挥发,低分子量的聚ε-己内酯-REDV小肽粘度低,具有向纤维表面迁移的趋势。一方面,迁移到表面的聚ε-己内酯-REDV小肽具有促进血管内皮细胞粘附和生长的功能;另一方面,该电纺纤维膜可用于包载核酸、蛋白、药物等生物活性物质,包载生物活性物质后的纤维仍然具有良好的纤维形貌,释放的生物活性物质具有良好的生物活性。该发明可用于生物医用材料领域。
附图说明
图1:实施例1制备的聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)/聚ε-己内酯-g-聚乙二醇-REDV电纺超细纤维膜包载miRNA复合的纳米粒子的SEM照片。
具体实施方式
下面通过实施案例对本发明的技术方案作进一步的描述,以下实施案例是对本发明的进一步说明,并不限制本发明的适用范围。
聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)/聚ε-己内酯-g-聚乙二醇-REDV电纺超细纤维膜由直径为400~1000nm的超细纤维构成,其厚度为50~200μm.
聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯),其特征在于PELCL的数均分子量为(7~20)×104
聚ε-己内酯-g-聚乙二醇-REDV,其特征在于所述聚ε-己内酯的数均分子量为(1~5)×104,所述聚ε-己内酯的分子式为:
式中,m=70~420;R1为-CH3或-CH2O(COCH2CH2CH2CH2CH2O)mCO(CH2)5OH;
聚ε-己内酯-g-聚乙二醇-REDV,其特征在于聚乙二醇的数均分子量为(1~5)×103,通式为R1-(CH2CH2O)n-R2,式中n=23~113,R1为可以与巯基发生反应的活性基团,包括马来酰亚胺基团、吡啶二硫基团、硫醇基团。R2为可以与氨基发生反应的活性基团,如琥珀酰亚胺基团、乙酸基团、乙醛基团、异氰酸基团、异氰硫酸基团、丙烯酸基团、硝基酚基团。
聚ε-己内酯-g-聚乙二醇-REDV的制备方法,其特征在于包括步骤:
(1)聚ε-己内酯的氨基化修饰:将聚ε-己内酯配成0.3~0.5g/mL的无水二氯甲烷溶液,使用N,N’-羰基二咪唑(CDI)活化羟基基团,按照摩尔比[单端羟基聚ε-己内酯]/[CDI]为1:1(或[双端羟基聚ε-己内酯]/[CDI]为1:2)加入CDI,在N2中室温下搅拌反应24h,然后加入过量乙二胺,室温下搅拌反应48~72h,产物用过量的甲醇沉淀,真空干燥,得到产物聚ε-己内酯的氨基改性物。
(2)聚-己内酯-g-聚乙二醇的制备:将聚-己内酯的氨基改性物配制为溶度为200~300mg/mL的二氯甲烷溶液,按照聚ε-己内酯的氨基改性物中的氨基与双端PEG中R2基团摩尔比为1:1加入双端PEG,室温搅拌均匀6~10h,产物使用乙醇沉淀,得到聚-己内酯-g-聚乙二醇。
(3)聚ε-己内酯-g-聚乙二醇偶联小肽REDV:将聚ε-己内酯-g-聚乙二醇配成溶度为200~300mg/mL的二氯甲烷溶液,按照摩尔比[聚ε-己内酯-g-聚乙二醇]/[REDV]=1:1加入REDV小肽,室温搅拌均匀2~5h,产物使用乙醇沉淀,得到聚ε-己内酯-g-聚乙二醇-REDV小肽。
聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)/聚ε-己内酯-g-聚乙二醇-REDV电纺超细纤维膜的制备方法,包括以下过程:
(1)聚ε-己内酯-g-聚乙二醇-REDV小肽和聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)(PELCL)一起溶于氯仿和N,N-二甲基甲酰胺以体积比为(4~8):1的混和溶剂中,配制成浓度100~200mg/mL的电纺溶液,PELCL和聚ε-己内酯-g-聚乙二醇-REDV小肽共聚物的质量比为(5~1):1;
(2)将按步骤(1)所得溶液进行电纺,电纺条件为:流量为0.02~0.10mL/h,电压为12~20kV,接收距离为15~20cm,得到50~200μm厚度的电纺纤维膜。
实施例1:
在装有磁力搅拌的三口瓶中,将3g聚ε-己内酯(双端羟基)溶解于10mL无水二氯甲烷中,按照按照摩尔比[双端羟基聚ε-己内酯]/[CDI]为1:2加入CDI65.0mg,在N2中室温下搅拌反应24h,然后加入2.0mL的乙二胺,室温搅拌反应48h,产物用过量的甲醇沉淀,真空干燥24h,得到聚ε-己内酯的氨基改性物。
将聚ε-己内酯的氨基改性物78mg溶解在3mL的二氯甲烷溶液,按照聚ε-己内酯的氨基改性物中的氨基与双端PEG中的NHS基团摩尔比为1:1加入双端PEG,马来酰亚胺-聚乙二醇-琥珀酰亚胺乙酸酯(MAL-PEG-NHS,)208mg,室温搅拌反应6h,产物使用乙醇沉淀,得到聚ε-己内酯-g-聚乙二醇。将聚ε-己内酯-g-聚乙二醇600mg溶解在3mL的二氯甲烷溶液,按照摩尔比[聚ε-己内酯-g-聚乙二醇]/[REDV]=1:1加入REDV 44mg,室温搅拌反应3h,产物使用乙醇沉淀,得到聚ε-己内酯-g-聚乙二醇-REDV小肽。
所制得的聚ε-己内酯-g-聚乙二醇-REDV小肽和聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)(LA:CL=3:1,)按照质量比1:1,溶于氯仿和N,N-二甲基甲酰胺以体积比为8:1的混和溶剂中,配制成浓度200mg/mL的电纺溶液。将上述混和溶液作为电纺溶液的油相,将溶度为0.3mg/mL的miRNA复合物溶液作为水相。并按照水油比1:25混和20min至均匀。电纺条件为:溶液的流量为0.04mL/h,电纺的电压为12kV,接收距离是15cm,电纺24h,得到厚度100μm的电纺纤维膜。所制得包载miRNA的聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)/聚ε-己内酯-g-聚乙二醇-REDV电纺超细纤维膜。该纤维膜的SEM照片如图1所示,其中超细纤维直径为900~1000nm。
实施例2:
在装有磁力搅拌的三口瓶中,将5g聚ε-己内酯(双端羟基)溶解于10mL无水二氯甲烷中,按照摩尔比[双端羟基聚ε-己内酯]/[CDI]为1:2加入CDI 32.4mg,在N2中室温下搅拌反应24h,然后加入2.0mL的乙二胺,室温搅拌反应60h,产物用过量的甲醇沉淀,真空干燥24h,得到聚ε-己内酯的氨基改性物。
将聚ε-己内酯的氨基改性物600mg溶解在3mL的二氯甲烷溶液,按照聚ε-己内酯的氨基改性物中的氨基与双端PEG中的NHS基团摩尔比为1:1加入双端PEG,马来酰亚胺-聚乙二醇-琥珀酰亚胺乙酸酯(MAL-PEG-NHS,)120mg,室温搅拌反应10h,产物使用乙醇沉淀,得到聚ε-己内酯-g-聚乙二醇。将聚ε-己内酯-g-聚乙二醇750mg溶解在3mL的二氯甲烷溶液,按照摩尔比[聚ε-己内酯-g-聚乙二醇]/[REDV]=1:1加入REDV 16.9mg,室温搅拌反应3h,产物使用乙醇沉淀,得到聚ε-己内酯-g-聚乙二醇-REDV小肽。
所制得的聚ε-己内酯-g-小肽REDV和聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)(LA:CL=3:1,)按照质量比5:1,溶于氯仿和N,N二甲基甲酰胺以体积比为6:1的混和溶剂中,配制成浓度150mg/mL的电纺溶液。电纺条件为:溶液的流量为0.1mL/h,电纺的电压为13~15kV,接收距离是15~20cm,电纺12h,得到50μm厚度的电纺超细纤维膜,超细纤维膜的直径为800~900nm。
实施例3:
在装有磁力搅拌的三口瓶中,将4g聚ε-己内酯(单端羟基)溶解于10mL无水二氯甲烷中,按照摩尔比[单端羟基聚ε-己内酯]/[CDI]为1:1加入CDI 65.0mg,在N2中室温下搅拌反应24h,然后加入2.0mL的乙二胺,室温搅拌反应72h,产物用过量的甲醇沉淀,真空干燥24h,得到聚ε-己内酯的氨基改性物。
将聚ε-己内酯的氨基改性物900mg溶解在3mL的二氯甲烷溶液,按照聚ε-己内酯的氨基改性物中的氨基与双端PEG中的NHS基团摩尔比为1:1加入双端PEG,马来酰亚胺-聚乙二醇-琥珀酰亚胺乙酸酯(MAL-PEG-NHS,)90mg,室温搅拌反应7h,产物使用乙醇沉淀,得到聚ε-己内酯-g-聚乙二醇。将聚ε-己内酯-g-聚乙二醇900mg溶解在3mL的二氯甲烷溶液,按照摩尔比[聚ε-己内酯-g-聚乙二醇]/[REDV]=1:1加入REDV 50.7mg,室温搅拌反应2h,产物使用乙醇沉淀,得到聚ε-己内酯-g-聚乙二醇-REDV小肽。
所制得的聚ε-己内酯-g-小肽REDV和聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)(LA:CL=3:1,)按照质量比2:1,溶于氯仿和N,N二甲基甲酰胺以体积为4:1的混和溶剂中,配制成浓度100mg/mL的电纺溶液。电纺条件为:溶液的流量为0.02mL/h,电纺的电压为15~20kV,接收距离是15~20cm,电纺24h,得到100~200μm厚度的电纺纤维膜,超细纤维的直径为400~700nm。

Claims (4)

1.一种聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)/聚ε-己内酯-g-聚乙二醇-REDV电纺超细纤维膜,其特征在于聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)和聚ε-己内酯-g-聚乙二醇-REDV的质量比为(5~1):1,超细纤维膜由直径为400~1000nm的超细纤维构成,其厚度为50~200μm;聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)的数均分子量为(7~20)×104;聚ε-己内酯的数均分子量为(1~5)×104,聚ε-己内酯的分子式为:
式中,m=70~420;R1为-CH3或-CH2O(COCH2CH2CH2CH2CH2O)mCO(CH2)5OH。
2.如权利要求1所述的超细电纺纤维膜,其特征是所述聚乙二醇的数均分子量为(1~5)×103;通式为R1-(CH2CH2O)n-R2,式中n=23~113,R1为与巯基发生反应的活性基团,包括马来酰亚胺基团、吡啶二硫基团或硫醇基团;R2为与氨基发生反应的活性基团,包括琥珀酰亚胺基团、乙酸基团、乙醛基团、异氰酸基团、异氰硫酸基团、丙烯酸基团或硝基酚基团。
3.权利要求1的一种聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)/聚ε-己内酯-g-聚乙二醇-REDV电纺超细纤维膜的制备方法,其特征在于包括以下过程:
(1)聚乙二醇-b-聚(L-丙交酯-co-ε-己内酯)和聚ε-己内酯-g-聚乙二醇-REDV一起溶于氯仿和N,N-二甲基甲酰胺以体积比为(4~8):1的混和溶剂中,配制成浓度100~200mg/mL的电纺溶液;
(2)将按步骤(1)所得溶液进行电纺,电纺条件为:流量为0.02~0.10mL/h,电压为12~20kV,接收距离是15~20cm,得到50~200μm厚度的电纺超细纤维膜。
4.权利要求3所述的方法,其特征是聚ε-己内酯-g-聚乙二醇-REDV的制备方法包括步骤:
(1)聚ε-己内酯的氨基化修饰;
(2)聚ε-己内酯-g-聚乙二醇的制备;
(3)聚ε-己内酯-g-聚乙二醇偶联小肽REDV。
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