CN116531557A - 一种高分子抗菌材料及其制备方法和应用 - Google Patents
一种高分子抗菌材料及其制备方法和应用 Download PDFInfo
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- CN116531557A CN116531557A CN202310607803.2A CN202310607803A CN116531557A CN 116531557 A CN116531557 A CN 116531557A CN 202310607803 A CN202310607803 A CN 202310607803A CN 116531557 A CN116531557 A CN 116531557A
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Abstract
本发明公开了一种高分子抗菌材料及其制备方法和应用,该高分子抗菌材料包括丝素蛋白接枝抗菌肽(SF‑AMP)和醛基化普朗尼克F127(F127‑CHO),还可以包括聚乙烯醇季铵盐(PVA‑TPE)。本发明原材料简单易得,价格便宜;制备过程中采用冷冻干燥和化学交联制备的敷料具有优异的力学性能、适合细胞生长的微孔结构、较好的吸水性、可控降解性能和优异的细胞相容性;同时具备良好的抗菌抗炎作用。可同时满足抗感染功能敷料的临床需求和PVA‑TPE优异的细菌成像和杀灭性能。
Description
技术领域
本发明涉及一种高分子抗菌材料及其制备方法和应用。
背景技术
皮肤作为人体最大的器官之一,在保护皮下组织免受外界有害因素侵袭、维持内环境稳态、保证机体正常生理功能顺利运转等方面发挥着巨大的作用。然而,覆盖于体表的皮肤在日常生活中非常容易受到损害而形成各种类型的伤口,包括穿刺伤、撕裂伤和割伤等急性创伤及烧伤烫伤、溃疡性伤口等慢性创伤。自然界中的一些生物聚合物具有生物相容性好、细胞无毒性、能够将人体皮肤表面与外界进行隔绝、保护皮肤免受外界环境刺激等特点,因此它们的改性物以及纳米复合材料具有不同功能,目前广泛应用于医疗伤口敷料领域。
现有技术存在的缺点:传统抗菌剂容易产生耐药性导致其效率较低,天然抗菌剂具有独特的生物相容性的优势,但是由于其抗菌效果不佳、工艺复杂以及数量极少等缺陷限制了其进一步应用;季铵化合物具有很强的抗菌活性,并被发现对多种细菌有效,但是,这些小分子季铵化合物极易产生耐药性和造成环境污染与破坏,并对人体产生毒性。相比之下,聚合物季铵盐具有化学稳定性,同时,避免了低分子量杀菌剂从聚合物基质中渗透的问题,以一种环境友好的方式保证了长期耐用性。其次,单一抗菌剂的使用造成耐药性高发及二次感染的风险;再者,普通的治疗药物无法实现实时、灵敏的细菌检测,在感染的诊断、预防和治疗上存在缺陷。
综上所述,常规传统敷料已经无法满足临床上对于伤口护理质量的要求,伤口感染导致治愈缓慢且病程延长,加重了患者的医疗经费负担。
发明内容
本发明的目的在于优化现有技术且提供一种高分子抗菌材料及其制备方法和应用,该高分子抗菌材料可实现同时细菌成像和抗菌、抗炎作用,因此该高分子抗菌材料可作为伤口敷料使用。
该高分子抗菌材料包括丝素蛋白接枝抗菌肽(SF-AMP)和醛基化普朗尼克F127(F127-CHO),还可以包括聚乙烯醇季铵盐(PVA-TPE),实现细菌成像的标记。
本发明中,基于聚乙烯醇衍生物的季铵化反应接枝具有聚集诱导发光性质的荧光基团(TPE)得到具有温度和pH响应的聚乙烯醇季铵盐(PVA-TPE),负载于基底材料接枝抗菌肽的丝素蛋白和醛基化普朗尼克上,实现了温度、pH双响应型且可同时细菌成像和杀灭的高分子抗菌材料的原位构建。主要内容为:通过修饰有叔胺基团的聚乙烯醇PVA与溴甲基四苯乙烯(TPE-CH2Br)发生季铵化反应,获得了带有四苯乙烯-TPE侧基的双响应PVA的聚合物季铵盐(PVA-TPE)。基于PVA-TPE的固有荧光基团和季铵基团,可以实现实时的细菌成像和细菌微环境的智能响应;丝素蛋白分子侧链上的-COOH能与EDC(1-乙基-(3-二甲基氨基丙基)碳酰二亚胺)发生反应,形成氨基反应活性的O-酰基脲中间体,NHS(N-羟基琥珀酰亚胺)能使该中间体转化为具有氨基反应活性的NHS酯,它能够与抗菌肽分子上的-NH2发生反应,通过酰胺键形成二者的键合物,从而达到抗菌肽接枝的目的。普朗尼克F127为三嵌段热敏共聚物,用其制备的水凝胶具有独特的温敏特性,丝素蛋白含有大量的氨基,使其与F127-CHO上的醛基官能团发生席夫碱反应进行交联,其中抗菌肽上的氨基也可与F127-CHO交联形成席夫碱键,由此构成水凝胶伤口敷料。由于席夫碱化合物具有固有的抗菌性能,可实现伤口敷料的多效抗菌。
醛基化普朗尼克的制备:
将PluronicF-127(12.3g,1mmol)溶解在70mL无水二氯甲烷中,然后加入30mL吡啶和1.14g(6mmol)对甲苯磺酰氯。体系在室温下反应24小时。之后,混合物用3mol/L盐酸萃取,有机相用10gNaHCO3洗涤。经四氢呋喃/乙醚混合溶剂重结晶,真空干燥后,得F-127对氨基苯磺酸酯。
将F-127对氨基苯磺酸酯(2.5g)溶解在50mLN,N-二甲基甲酰胺中,然后加入4-羟基苯甲醛(0.11g,0.9mmol)和K2CO3(0.12g,0.9mmol)。将混合物在80℃搅拌72小时,然后冷却至室温。加入50mLH2O后用二氯甲烷萃取反应溶液。有机层用MgSO4干燥,浓缩并在冷乙醚中沉淀(过量十倍)。过滤后,将F127-CHO在室温下真空干燥24小时。
丝素蛋白的制备:
首先去除桑蚕茧的茧衣,剥离蚕蛹,并将其剪成片状,便于较为充分的脱胶,称取20g蚕茧,将蚕茧放入0.5wt%的碳酸钠溶液浸入2L水浴锅中脱胶,加热煮沸30min,并在去离子水中清洗3次,然后按照上述步骤重复脱胶3次,用去离子水冲洗,以便去掉残余的丝胶及碳酸钠溶液,然后在烘箱中干燥备用。将10g上述烘干后的丝素蛋白溶解在80mL溴化锂(9.3M)溶液中,在60℃下完全溶解后加入0.48gNaOH反应1h,加入1mLHCl中和未反应完的NaOH继续反应3h。反应结束后将溶液过滤除去不溶物,移至透析袋(MW:12000-14000Da)用蒸馏水透析48小时。溶液冻干后收集得到丝素蛋白(SF)。
抗菌肽接枝丝素蛋白(SF-AMP)的制备:
将500mg丝素蛋白溶解在200mL纯水中形成4mg/mL的丝素蛋白水溶液,然后将500mg抗菌肽(AMP)加入到SF水溶液中,磁力搅拌约4小时以获得澄清溶液。将750mg EDC和660mg HoBt溶解于10mL的DMSO/H2O(1:1)溶液中。然后使用NaOH和HCl溶液将上述溶液的pH调节至4.75,继续反应4小时,然后将pH调节至7.0结束反应。将上述完成反应后的混和溶液置于去离子水中透析一天,每天至少更换三次透析液,用截留分子量为8-15kDa纤维素透析袋进行透析。经-50℃冷冻干燥后得到冻干的SF-AMP粉末。
细菌感染微环境伴随着pH、温度、细菌毒素和脂肪酶的变化,为敷料响应性应答提供了基础。聚乙烯醇(PVA)由于其出色的生物相容性和生物粘附性,己被广泛用于生物医学。叔胺基团很容易接枝到PVA的侧羟基上,所得的pH和温度响应的PVA将是制备pH敏感的聚合物季铵盐的理想前体。我们设计的带有TPE侧基的双响应PVA的聚合物季铵盐(PVA-TPE)实现了温度,pH双响应型联合细菌成像和杀灭的高分子抗菌材料的原位构建。基于实时、灵敏的细菌检测以及原位杀灭的迫切临床需求,构建细菌感染部位微环境响应的“监测和杀灭细菌”的集成系统在诊断、预防和治疗细菌感染性疾病领域具有广阔的应用前景。
与现有技术相比,本发明的有益效果为:
本发明原材料简单易得,价格便宜;
本发明采用冷冻干燥和化学交联制备的敷料具有优异的力学性能、适合细胞生长的微孔结构、较好的吸水性、可控降解性能和优异的细胞相容性;同时具备良好的抗菌抗炎作用。
可同时满足抗感染功能敷料的临床需求和PVA-TPE优异的细菌成像和杀灭性能。
附图说明
图1为(A)PVA和PVA-DEEDA的核磁氢谱图;(B)PVA-TPE的核磁氢谱图;
图2为实施例1、实施例2、实施例3和实施例4制备的水凝胶扫描电镜图;
图3为实施例1、实施例2、实施例3和实施例4制备的水凝胶敷料的吸水率;
图4为实施例1、实施例2、实施例3和实施例4制备的水凝胶敷料的孔隙率;
图5为实施例1、实施例2、实施例3和实施例4制备的水凝胶敷料的水蒸气透过率。
具体实施方式
为让本领域的技术人员更加清晰直观的了解本发明,下面将结合附图,对本发明作进一步的说明。
PVA-TPE的制备:
10.0g聚乙烯醇溶于装有200mL DMSO的容器中,90℃下充分溶解。待其完全溶解后,将溶液温度降到室温,向上述溶液中加入18.4g CDI(N,N'-羰基二咪唑)活化3小时。接着向上述溶液缓慢加入16mL DEEDA(二乙基乙二胺)室温反应24小时。随后加入100mL氨水溶液,搅拌1.5小时,除去未反应的CDI。最后,加入10倍丙酮将混合物进行沉淀,将沉淀物溶于去离子水中透析3天,冻干获得改性聚乙烯醇(PVA-DEEDA)。称取1gPVA-DEEDA溶于12mLDMSO,80℃水浴加热搅拌溶解后,将35mg TPE-CH2Br溶于1mL DMSO中,并将其缓慢加入到装有PVA-DEEDA溶液的圆底烧瓶中,将该混合物在70℃下进一步搅拌24小时。最后加入10倍丙酮对产物进行沉淀,将沉淀物用水透析3天,然后冻干以获得纯净的PVA-TPE。
醛基化普朗尼克的制备:
将PluronicF-127(12.3g,1mmol)溶解在70mL无水二氯甲烷中,然后加入30mL吡啶和1.14g(6mmol)对甲苯磺酰氯。体系在室温下反应24小时。之后,混合物用3mol/L盐酸萃取,有机相用10g NaHCO3洗涤。经四氢呋喃/乙醚混合溶剂重结晶,真空干燥后,得F-127对氨基苯磺酸酯。
将F-127对氨基苯磺酸酯(2.5g)溶解在50mLN,N-二甲基甲酰胺中,然后加入4-羟基苯甲醛(0.11g,0.9mmol)和K2CO3(0.12g,0.9mmol)。将混合物在80℃搅拌72小时,然后冷却至室温。加入50mL H2O后用二氯甲烷萃取反应溶液。有机层用MgSO4干燥,浓缩并在冷乙醚中沉淀(过量十倍)。过滤后,将F127-CHO在室温下真空干燥24小时。
丝素蛋白的制备
首先去除桑蚕茧的茧衣,剥离蚕蛹,并将其剪成片状,便于较为充分的脱胶,称取20g蚕茧,将蚕茧放入0.5wt%的碳酸钠溶液浸入2L水浴锅中脱胶,加热煮沸30min,并在去离子水中清洗3次,然后按照上述步骤重复脱胶3次,用去离子水冲洗,以便去掉残余的丝胶及碳酸钠溶液,然后在烘箱中干燥备用。将10g上述烘干后的丝素蛋白溶解在80mL溴化锂(9.3M)溶液中,在60℃下完全溶解后加入0.48g NaOH反应1h,加入1mL HCl中和未反应完的NaOH继续反应3h。反应结束后将溶液过滤除去不溶物,移至透析袋(MW:12000-14000Da)用蒸馏水透析48小时。溶液冻干后收集得到丝素蛋白(SF)。
抗菌肽接枝丝素蛋白(SF-AMP)的制备
将500mg丝素蛋白溶解在200mL纯水中形成4mg/mL的丝素蛋白水溶液,然后将500mg抗菌肽(AMP)加入到SF水溶液中,磁力搅拌约4小时以获得澄清溶液。将750mg EDC和660mg HoBt(1-羟基苯并三唑)溶解于10mL的DMSO/H2O(1:1)溶液中。然后使用NaOH和HCl溶液将上述溶液的pH调节至4.75,继续反应4小时,然后将pH调节至7.0结束反应。将上述完成反应后的混和溶液置于去离子水中透析一天,每天至少更换三次透析液,用截留分子量为8-15kDa纤维素透析袋进行透析。经-50℃冷冻干燥后得到冻干的SF-AMP粉末。
实施例1
本实施例的高分子抗菌材料包括以下质量百分浓度的组分:10%的F127-CHO、1%的SF-AMP;
本实施例的高分子抗菌材料的制备方法,包括以下步骤:
1.配制质量浓度为20%的F127-CHO水溶液,得到溶液A;
2.配制质量浓度为的2%的SF-AMP水溶液,记为溶液B;
3.将上述溶液A和溶液B按体积比1:1混合均匀,得到水凝胶,冻干之后可作为水凝胶伤口敷料。
实施例2
本实施例的高分子抗菌材料包括以下质量百分浓度的组分:10%的F127-CHO、2%的SF-AMP;
本实施例的高分子抗菌材料的制备方法,包括以下步骤:
1.配制质量浓度为20%的F127-CHO水溶液,得到溶液A;
2.配制质量浓度为的4%的SF-AMP水溶液,记为溶液B;
3.将上述溶液A和溶液B按体积比1:1混合均匀,得到水凝胶,冻干之后可作为凝胶伤口敷料。
实施例3
本实施例的高分子抗菌材料包括以下质量百分浓度的组分:10%的F127-CHO、3%的SF-AMP;
本实施例的高分子抗菌材料的制备方法,包括以下步骤:
1.配制质量浓度为20%F127-CHO水溶液,得到溶液A;
2.配制质量浓度为的6%SF-AMP水溶液,记为溶液B;
3.将上述溶液A和溶液B按体积比1:1混合均匀,得到水凝胶,冻干之后可作为水凝胶伤口敷料。
实施例4
本实施例的高分子抗菌材料包括以下质量百分浓度的组分:10%的F127-CHO、2%的SF-AMP、0.05mg/mL的PVA-TPE;
本实施例所述伤口敷料,包括以下步骤:
1.配制质量浓度为20%的F127-CHO水溶液,加入0.1mg/mL的PVA-TPE得到溶液A;
2.配制质量浓度为的4%的SF-AMP水溶液,记为溶液B;
3.将上述溶液A和溶液B按体积比1:1混合均匀,得到水凝胶,冻干之后得到水凝胶敷料。
实验步骤:
1.核磁检测
使用核磁共振光谱仪对所制备的丝素蛋白钠接枝抗菌肽(SF-AMP)、PVA-TPE进行了1H-NMR谱图测定。SF-AMP是基于EDC/NHS偶联技术将AMP接枝到丝素蛋白主链上形成的共聚物,EDC/NHS活化SF上的羧基基团,羧基与AMP上的氨基基团发生缩合反应。SF-AMP的氢谱显示在2.8ppm位置上出现了酯基的峰,表明SF-AMP成功制备。
2.采用一维核磁氢谱(1HNMR)对制备得到的PVA-DEEDA和PVA-TPE进行结构分析。如图1所示,在3.16和0.95ppm处的峰分别对应于的DEEDA单元在位置1和2上的氢。新峰的存在充分验证了DEEDA基团对PVA的成功修饰。PVA-TPE是通过TPECH2Br与DEEDA进行一步季铵化得到的。图中的1HNMR谱图中7.0ppm峰的出现,表明TPE单元被成功接枝。
3.扫描电子显微镜(SEM)
分别将实施例1、实施例2、实施例3和实施例4制备的水凝胶经冷冻干燥后放在专用样品盘上,经喷金后置入环境扫描电子显微镜,观察样品表面形貌。
如图2所示,通过SEM观察水凝胶的形貌,所有水凝胶均具有三维网络结构,孔径分布均匀。与实施例1和实施例4相比,实施例2和实施例3的孔径更大,这是由于SF-AMP的体积比例的增加,大大增加了水凝胶的孔径。更大的孔径虽然更有利于细胞粘附和生长,但是也会导致其他性能的减弱,因此选择实施例1和实施例4为最优组。
4.吸水性能测试
称取敷料支架质量m0,以及计算敷料支架的面积s,放入一定体积的去离子水当中,37℃条件下浸泡,一段时间后称取饱和浸润敷料支架的重量mt,称取重量时用滤纸擦去表面多余的水分。不同时间点的吸水率W根据公式计算如下:
W=(mt-m0)/s;
图3所示为各实施例中制备的伤口敷料的吸水率测试结果,从中可知,吸水率大小为实施例2最大为24.8%,实施例3最小为14.8%,而实施例1和实施例4分别为21.5%和24.4%,这是由于SF-AMP骨架上存在大量的亲水性官能团(如羧基和羟基),这些官能团可以提高支架的亲水性及保水性能,以从而改善了多孔支架的连通性和亲水性,促进了细胞迁移和增殖。而较大的吸水率易伤口组织快速脱水,导致在创面处形成更大的疤痕组织,较小的吸水率易导致组织渗透液的聚集,不利于伤口愈合。
5.将已知体积(V1)的乙醇倒入装样品的有刻度的容器中,注意乙醇浸没样品。将容器放入大干燥器中抽真空1h,充分浸润样品,除去样品孔洞中的所有空气,记录此时的体积V2。取出样品后,将剩余乙醇的体积记录为V3。按照公式计算孔隙率M(%):
M=(V1-V3)/(V2-V3);
如图4所示为实例的孔隙率测试结果,实施例1为81.1%,实施例2为85.1%,实施例3为82.5%,实施例4为80.1%。随着样品SF-AMP的提高,敷料样品的孔隙率有所下降,这一现象的解释是随着加入SF-AMP溶液体积的提高,分子间作用力增强,使得对其进行交联时空隙在不断减小,最终导致了干燥形成的海绵样品孔洞逐渐减小,造成了孔隙率的下降。
6.水蒸气透过率测试
将试样装夹在透湿杯中,放置在37℃下,试样的两侧形成一定的湿度差,水蒸气会在湿度差的作用下,由高湿侧穿过试样向低湿侧渗透,通过对透湿杯重量随时间的变化进行测定,即可求而出试样的水蒸气透过率的等参数。
WVTR=(W0-W1)×24)/(s×t);
其中W0表示体系初始质量(g),W1表示体系最终质量(g),s代表面积(cm2),t代表测试时间,WVRT单位为(g/m2·24h)。
图5所示为不同比例下的水蒸气透过率,实施例1为2409.8g/m2·24h,实施例2为3621.9g/m2·24h,实施例3为3160.9g/m2·24h,实施例4为2358.1g/m2·24h。使用WVTR值较高的敷料作用于创面可能会引发伤口组织快速脱水,导致在创面处形成更大的疤痕组织;而较低的WVTR会阻碍伤口组织与外界环境的气体交换,可能会导致厌氧菌的繁殖和组织渗液的积聚,从而引发伤口炎症甚至溃烂。因此选用实施例1的敷料作为最优组。实施例2和实施例3偏大的原因可能是SF-AMP的存在导致交联后的敷料内部存在更大的缝隙导致WVTR值的增加。
7.拉伸性能测试
将材料剪成75×15mm的长方形,在室温,湿度60%条件下用厚度仪测其厚度,然后使用万能材料实验机测定其拉伸力学性能,设定参数如下:拉伸速度为10mm/min,夹持距离为65mm,样品宽度为15mm。拉伸断裂强度由公式进行计算。式中F(N)为试样断裂时的负荷,b(mm)、d(mm)分别为样品宽度与厚度。
从表1中表明四个实施例制备的敷料的抗拉强度范围为0.3~1.0MPa,适用于伤口护理。断裂伸长率表示材料的柔韧性,四个实施例制备的敷料在断口处的伸长率在10%~25%之间,可以保护伤口免受外部的碰撞。由此可见,各实施例制备的敷料有比较好的抗断裂强度和柔韧性,适合于敷料的临床应用。
表1伤口敷料的拉伸强度和断裂伸长
拉伸强度(MPa) | 断裂伸长率(%) | |
实施例1 | 0.95±0.11 | 16.36±4.12 |
实施例2 | 0.99±0.36 | 11.86±1.14 |
实施例3 | 0.37±0.24 | 25.82±10.66 |
实施例4 | 0.94±0.08 | 15.66±3.89 |
本发明中的伤口敷料具有优异的力学性能、适合细胞生长的微孔结构、较好的彭润性、可控降解性能和优异的细胞相容性;同时具备良好的抗菌抗炎作用。可同时满足抗感染功能敷料的临床需求和PVA-TPE优异的细菌成像和杀灭性能。实施例4中加入PVA-TPE证明了PVA-TPE对本发明的材料物理性能没有很大的影响。
上述对实施例的描述是为便于该技术领域的普通技术人员能理解和应用本发明。熟悉本领域技术的人员显然可以容易地对这些实施例做出各种修改,并把在此说明的一般原理应用到其他实施例中而不必经过创造性的劳动。因此,本发明不限于这里的实施例,本领域技术人员根据本发明的揭示,对于本发明做出的改进和修改都应该在本发明的保护范围之内。
Claims (10)
1.一种高分子抗菌材料,其特征在于,包括丝素蛋白接枝抗菌肽和醛基化普朗尼克F127。
2.如权利要求1所述的一种高分子抗菌材料,其特征在于,还包括聚乙烯醇季铵盐。
3.如权利要求1所述的一种高分子抗菌材料,其特征在于,所述醛基化普朗尼克F127的质量百分浓度为10%;
所述丝素蛋白接枝抗菌肽的质量百分浓度为1-3%。
4.如权利要求2所述的一种高分子抗菌材料,其特征在于,所述聚乙烯醇季铵盐的质量浓度为0.05mg/mL。
5.如权利要求1或3所述的一种高分子抗菌材料的制备方法,其特征在于,包括如下步骤:
(1)制备醛基化普朗尼克F127水溶液;
(2)制备丝素蛋白接枝抗菌肽的水溶液;
(3)将醛基化普朗尼克F127水溶液和丝素蛋白接枝抗菌肽的水溶液按体积比1:1混合均匀,得到水凝胶。
6.如权利要求5所述的一种高分子抗菌材料的制备方法,其特征在于,所述步骤(1)中,所述的醛基化普朗尼克F127的制备方法包括:
(11)将普朗尼克F127溶解在无水二氯甲烷中,然后加入吡啶和对甲苯磺酰氯,在室温下反应后,混合物用3mol/L盐酸萃取,有机相用NaHCO3洗涤;经四氢呋喃/乙醚混合溶剂重结晶,真空干燥后,得普朗尼克F127对氨基苯磺酸酯;
(12)将普朗尼克F127对氨基苯磺酸酯溶解在N,N-二甲基甲酰胺中,然后加入4-羟基苯甲醛和K2CO3;将混合物在80℃搅拌溶解,然后冷却至室温;加入H2O后用二氯甲烷萃取反应溶液;有机层用MgSO4干燥,浓缩并在冷乙醚中沉淀;过滤后,得到的F127-CHO在室温下真空干燥。
7.如权利要求5所述的一种高分子抗菌材料的制备方法,其特征在于,所述步骤(2)中,丝素蛋白接枝抗菌肽的制备方法包括:
(21)将丝素蛋白溶解在纯水中制备成丝素蛋白水溶液,然后将抗菌肽加入到丝素蛋白水溶液中,磁力搅拌以获得澄清溶液;
(22)将EDC和HoBt溶解于DMSO/H2O(1:1,v/v)溶液中;然后将溶液的pH调节至4.75,继续反应,反应完成后继续将pH调节至7.0结束反应;将上述完成反应后的混和溶液置于去离子水中透析,每天至少更换三次透析液,用截留分子量为8-15kDa纤维素透析袋进行透析;冷冻干燥后得到冻干的丝素蛋白-抗菌肽接枝共聚物粉末。
8.如权利要求2所述的一种高分子抗菌材料的制备方法,其特征在于,包括如下步骤:
(1)制备醛基化普朗尼克F127水溶液,加入0.1mg/mL PVA-TPE;
(2)制备丝素蛋白接枝抗菌肽的水溶液;
(3)将醛基化普朗尼克F127水溶液和丝素蛋白接枝抗菌肽的水溶液按体积比1:1混合均匀,得到水凝胶。
9.如权利要求8所述的一种高分子抗菌材料的制备方法,其特征在于,所述PVA-TPE的制备方法包括如下步骤:
聚乙烯醇溶于DMSO中充分溶解,将溶液温度降到室温,加入CDI活化;
接着缓慢加入DEEDA室温反应,随后加入氨水溶液,搅拌除去未反应的CDI;
加入丙酮将混合物进行沉淀,将沉淀物溶于去离子水中透析,冻干获得改性聚乙烯醇;
取PVA-DEEDA溶于DMSO,水浴加热搅拌溶解后,将TPE-CH2 Br溶于DMSO中,并将其缓慢加入到装有PVA-DEEDA溶液中,将该混合物搅拌混合;
最后加入丙酮对产物进行沉淀,将沉淀物用水透析,然后冻干以获得纯净的PVA-TPE。
10.如权利要求1-4任一项所述的高分子抗菌材料作为伤口敷料的应用。
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