CN117653776A - 一种协同光热治疗的动态水凝胶及其制备方法及应用 - Google Patents
一种协同光热治疗的动态水凝胶及其制备方法及应用 Download PDFInfo
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- CN117653776A CN117653776A CN202311670974.6A CN202311670974A CN117653776A CN 117653776 A CN117653776 A CN 117653776A CN 202311670974 A CN202311670974 A CN 202311670974A CN 117653776 A CN117653776 A CN 117653776A
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- Materials For Medical Uses (AREA)
Abstract
本发明涉及医用敷料,具体公开了一种协同光热治疗的动态水凝胶及其制备方法及应用,通过将儿茶酚基团偶联到壳聚糖上,偶联的儿茶酚基团与Fe3+发生配位反应,明胶溶液中含有大量的羧酸基团,与Fe3+发生配位反应,儿茶酚偶联壳聚糖与明胶也能形成氢键,进而交联形成水凝胶,其具有快速凝胶、良好的力学性能、止血性能、黏附性、自愈性和优良的生物相容性。将其加载抗菌抗炎的黄芩苷与四氧化三铁纳米粒协同光热治疗,展现了优异伤口抗菌性能及伤口愈合性能。这种水凝胶敷料在愈合伤口方面具有潜在应用价值。
Description
技术领域
本发明涉及医用敷料,具体涉及一种协同光热治疗的动态水凝胶及其制备方法及应用。
背景技术
皮肤是人体的重要器官之一,具有调节体温、避免外来物质侵害等功能。长时间暴露在外界的皮肤容易受到损伤。如果皮肤受损,其自愈过程较为漫长,主要阶段包括皮肤止血、炎症、增生和伤口重塑。但是愈合过程并不能够及时协调,对于免疫力低下、老年人群皮肤再生能力降低,愈合过程缓慢,易产生慢性伤口。旨在加速伤口愈合,已经开发了各种生物材料,例如静电纺丝纤维、泡沫、止血海绵、薄膜、水凝胶等。由于水凝胶具有优异的生物相容性和保湿性能,所以在创伤性伤口治疗中其协助组织修复的能力被广泛研究。
此外,伤口部位凝胶的随机移动可能会导致凝胶损坏,所以凝胶要具有良好的自愈性能。因此开发一种具有优良自愈性能的伤口敷料水凝胶十分必要。具备自愈特性的水凝胶通常由动态化学键结构构成,金属配位键是一种常用的动态化学键,其中Fe3+与邻苯二酚是常见的金属配位系统。邻苯二酚与Fe3+的金属配位键具有新的耗能机制,具备载荷分散和冲击吸收的牺牲结合功能,引入配位键能够赋予材料良好的自愈性能。
明胶(Gelatin)是一种天然高分子材料,具有良好的生物相容性,无毒且易降解。其具有–COOH、–NH2等基团,可以很容易地对明胶基水凝胶修饰。壳聚糖是被使用最广泛的生物大分子,然而壳聚糖的水溶性差限制了其应用。细菌感染是伤口修复中的一个重要问题。长期使用抗生素会出现细菌耐药性,黄芩苷是一种天然黄酮类化合物,具有显著的生物活性,对炎症、病毒、细菌具有防御作用。光热治疗(PTT)作为一种新的抗菌策略,可以利用近红外光极强的穿透力杀死细菌,从而解决细菌感染的问题。
因此开发了一种新型多功能水凝胶敷料成为亟需解决的技术问题。
发明内容
本发明克服现有技术的不足,提供一种协同光热治疗的动态水凝胶,所述水凝胶不含有有毒的交联剂、引发剂等组分,具有良好的生物相容性;此外,所述的水凝胶敷料还具有快速凝胶、良好的力学性能、止血性能、黏附性和自愈性。
为解决上述技术问题,本发明所采用的技术方案为:一种协同光热治疗的动态水凝胶,以壳聚糖为原料,3,4-二羟基苯丙酸为反应物,在催化剂1-乙基-(3-二甲基氨基丙基)碳酰二亚胺与N-羟基琥珀酰亚胺作用下反应得儿茶酚偶联壳聚糖,然后将儿茶酚偶联壳聚糖与明胶、氯化铁、黄芩苷及四氧化三铁纳米粒混合,通过化学交联制备与协同激光下得到动态水凝胶。儿茶酚偶联壳聚糖(Csc)显著增强了难溶于水的壳聚糖的水溶性,其还具有黏附性能和止血性能。
本发明还提供上述一种协同光热治疗的动态水凝胶的制备方法,包括以下步骤:
S1、将壳聚糖预先分散在乙酸中充分溶解得到Cs溶液,用蒸馏水溶解3,4-二羟基苯丙酸,得到HCA溶液,将1-乙基-(3-二甲基氨基丙基)碳酰二亚胺与N-羟基琥珀酰亚胺溶于乙醇/水混合溶液中得到EDC/NHS溶液,将HCA溶液加到Cs溶液中,得到Cs/HCA溶液,再将EDC/NHS溶液滴加到Cs/HCA溶液中,在室温下反应24h,经过透析和冷冻干燥制得儿茶酚偶联壳聚糖,利用3,4-二羟基苯丙酸与壳聚糖骨架上的氨基发生反应,得到儿茶酚偶联壳聚糖;
S2、将步骤S1合成的儿茶酚偶联壳聚糖预先分散在去离子水中得到分散液,再将明胶溶液加入到分散液中,再加入氯化铁到分散液中,将黄芩苷溶于磷酸缓冲液后再加入到分散液中,再向分散液中加入四氧化三铁纳米粒,通过化学交联与激光照射下得到一种协同光热治疗的动态水凝胶。
进一步的,步骤S1中,所述壳聚糖与3,4-二羟基苯丙酸的质量比为1:1.1。
进一步的,步骤S1中,所述1-乙基-(3-二甲基氨基丙基)碳酰二亚胺与N-羟基琥珀酰亚胺的摩尔比为1:1,所述1-乙基-(3-二甲基氨基丙基)碳酰二亚胺与N-羟基琥珀酰亚胺的总质量与壳聚糖的质量比为1.5:1。
进一步的,步骤S1中,室温反应时反应溶液的pH为4.5~5.5。
进一步的,步骤S1中,乙醇/水混合溶液中乙醇和水体积比为1:1。
进一步的,步骤S2中,所述儿茶酚偶联壳聚糖的质量浓度为12.5%,所述明胶的质量浓度为12.5%,所述黄芩苷在磷酸缓冲液中的浓度为25mg/ml,所述氯化铁的质量浓度为6%,所述四氧化三铁纳米粒的浓度为2mg/ml,所述激光的波长为808nm。
进一步的,步骤S2中,所述儿茶酚偶联壳聚糖与明胶质量比为6:4、5:5、4:6或3:7,所述氯化铁与儿茶酚偶联壳聚糖的质量比为1:3。
本发明把儿茶酚基团偶联到壳聚糖上,偶联的儿茶酚基团与Fe3+发生配位反应,明胶溶液中含有大量的羧酸基团,也与Fe3+发生配位反应,改性的壳聚糖与明胶也能形成氢键,其中配位键带来了新的能量耗散机制,为水凝胶提供了延展性。其还具有快速凝胶、良好的力学性能、止血性能、黏附性、自愈性和优良的生物相容性。基于光热治疗并加载抗菌抗炎的黄芩苷与四氧化三铁纳米粒,展现了优异伤口抗菌性能。
另外,本发明还提供上述一种协同光热治疗的动态水凝胶在制备皮肤伤口用创面敷料中的应用。
与现有技术相比本发明具有以下有益效果:
本发明的协同光热治疗的动态水凝胶,将动态的配位键与光热治疗引入水凝胶体系中,制备了一种用于创面快速愈合的协同光热治疗的动态水凝胶,拓宽了其在伤口敷料方面的潜在应用价值。
本发明的协同光热治疗的动态水凝胶,首先采用偶联反应对其进行改性,得到儿茶酚偶联壳聚糖。极大提高了在不同pH值下的水溶性,使得改性后的壳聚糖止血活性与黏附性显著提高,能加速伤口愈合,实现黏附性与止血性能极大提升。进一步地,由于偶联的儿茶酚基团与Fe3+发生配位反应,明胶溶液中含有大量的羧酸基团,也与Fe3+发生配位反应,使得水凝胶实现了自愈性能与良好的力学特性。
本发明的协同光热治疗的动态水凝胶,通过金属配位键、氢键交联的动态水凝胶,其具有快速凝胶、良好的力学性能、止血性能、黏附性、自愈性和优良的生物相容性。基于光热治疗并加载抗菌抗炎的黄芩苷与四氧化三铁纳米粒,展现了优异伤口愈合性能与抗菌性能。
总之,该协同光热治疗的动态水凝胶具有快速凝胶、抗菌时间长、止血性能好、创面愈合快的特点,在各组分的协同作用下,赋予其良好的机械性能、生物相容性、黏附性能和抗菌性能。
附图说明
图1为实施例中的动态水凝胶各组分的红外光谱图。
图2为实施例中制备的一种协同光热治疗的动态水凝胶不同质量比的凝胶时间图。
图3为实施例中制备的一种协同光热治疗的动态水凝胶不同质量比的力学性能图。
图4为实施例中制备的一种协同光热治疗的动态水凝胶不同质量比的黏附性能图。
图5为实施例中制备的一种协同光热治疗的动态水凝胶的光热性能图。
图6为实施例中制备的一种协同光热治疗的动态水凝胶不同质量比的止血性能图。
图7为实施例中制备的一种协同光热治疗的动态水凝胶的抗菌性能图。
图8为实施例中制备的一种协同光热治疗的动态水凝胶的细胞相容性图。
图9为实施例中制备的一种协同光热治疗的动态水凝胶的动物实验图。
具体实施方式
以下结合具体实施例对本发明作进一步说明。
实施例1
本实例提供一种协同光热治疗的动态水凝胶及其制备方法, 具体包括以下步骤:
(1)制备儿茶酚偶联壳聚糖(Csc)
将2g壳聚糖(Cs)溶于100 mL 1%乙酸中,得到Cs溶液,将1.82g 3,4-二羟基苯丙酸(HCA)溶于10mL蒸馏水中,得到HCA溶液。将1.92g 1-乙基-(3-二甲基氨基丙基)碳酰二亚胺(EDC)和1.15g N-羟基琥珀酰亚胺(NHS)溶于90mL乙醇/水(体积比为1:1)混合溶液中。将HCA溶液加到Cs溶液中,得到Cs/HCA溶液,再将EDC/NHS溶液滴加到Cs/HCA溶液中,将溶液PH保持在4.5~5.5之间,反应24h,之后在pH为5去离子水中透析三天,再用去离子水透析4h,冷冻干燥处理,得到Csc粉末。
(2)制备动态水凝胶
配置12.5% Csc溶液与12.5% 明胶(Gelatin)溶液,将1.2g 12.5% Csc与0.8g12.5% Gelatin混合(质量比为6:4),室温下充分搅拌20分钟。再将0.4g 氯化铁(FeCl3)粉末加入混合溶液Csc/Gelatin中,水浴锅轻微搅拌5分钟,之后静置,即得到动态水凝胶Cgl@Fe。
实施例2
同实施例1,区别仅在于:步骤(2)中改为1g 12.5% Csc与1g 12.5% Gelatin混合(质量比为5:5),加入0.33g 氯化铁。
实施例3
同实施例1,区别仅在于:步骤(2)中改为0.8g 12.5% Csc与1.2g 12.5% Gelatin混合(质量比为4:6),加入0.27g 氯化铁。
实施例4
同实施例1,区别仅在于:步骤(2)中改为0.6g 12.5% Csc与1.4g 12.5% Gelatin混合(质量比为3:7),加入0.2g 氯化铁。
实施例5
同实施例2,区别仅在于:步骤(2)中加入氯化铁(FeCl3)粉末后还加入黄芩苷(Bai),即:将黄芩苷(Bai)溶于磷酸缓冲液中后,再将其加入到混合液中,反应得到Cgl@Fe/Bai;磷酸缓冲液中黄芩苷(Bai)的浓度为25mg/ml。
实施例6
同实施例2,区别仅在于:步骤(2)中加入氯化铁(FeCl3)粉末后还加入黄芩苷(Bai)和四氧化三铁纳米粒,即:将黄芩苷(Bai)溶于磷酸缓冲液中后,再将其加入到混合液中,再加入四氧化三铁纳米粒,反应得到Cgl@Fe/Bai@Fe3O4 NPs;磷酸缓冲液中黄芩苷(Bai)的浓度为25mg/ml,四氧化三铁纳米粒的浓度为2mg/ml。
为验证本发明制备一种协同光热治疗的动态水凝胶的成功制备以及其各方面性能,进行以下性能测试。
实验过程:
(1)红外光谱实验:利用傅里叶变换红外光谱仪(FTIR)测试Cs、Csc、Csc/Gelatin、实施例2制备的Cgl@Fe不同样品在波长范围400~4000 cm-1之间的红外光谱图。
(2)凝胶时间实验:在室温下将实施例1-4不同质量比的未反应水凝胶前体溶液,分别置于4个相同大小培养皿(直径60mm)中,待反应开始时开始计时,观察样品从液态逐渐转变为凝胶状态,当水凝胶完全转变为凝胶状态时,停止计时,记录下所经过的时间,即为凝胶时间。
(3)力学性能实验:采用万能力学试验机实施例1-4对不同质量比Cgl@Fe水凝胶,制备成所需样品,进行压缩性能、拉伸性能与循环拉伸、压缩测试。
(4)黏附性能实验:取新鲜猪皮肤组织被切成10mm×30mm的矩形,然后浸入PBS中,将实施例1-4对不同质量比Cgl@Fe分别取300μL水凝胶溶液均匀涂在粘合区域为10mm×10mm猪皮的表面,再将另一块猪皮置于黏合区域进行叠加黏附,之后将猪皮在室温下放置3小时,力学试验机的拉伸速度为2 mm/min进行叠加剪切试验。
(5)光热性能实验:测试0.5g/ml、1g/ml、1.5g/ml、2g/ml Fe3O4纳米粒浓度在红外光(808nm,1W/cm2)照射升温曲线;测试0.5W/cm2、1W/cm2、1.5W/cm2、2W/cm2 Fe3O4纳米粒(2g/ml)在红外光(808nm)照射升温曲线。在实施例2的步骤(2)中加入氯化铁(FeCl3)粉末后还加入2g/ml的Fe3O4纳米粒,反应得到Hydrogel/ Fe3O4 NPs,为了对比,将实施例2的水凝胶(标记为Hydrogel),以及负载纳米粒Fe3O4的Hydrogel/ Fe3O4 NPs(2g/ml)水凝胶置于24孔板中,并且在每个孔中分别滴加1mL的PBS,使用808nm(1W/cm2)光照时间为5min。由红外热成像仪检测并记录每分钟不同水凝胶的实时温度,拍摄水凝胶的热成像图。
(6)止血性能实验:称取一定量的实施例1-4不同质量比的凝胶样品,将水凝胶放置在5 mL离心管中置于37℃水浴锅中保持5分钟。随后将300μL抗凝兔血和300μL 0.25mol/L CaCl2溶液依次加入离心管中,混合均匀后,将离心管进行倒置,观察管中血液的流动情况,待血液完全凝固时记录凝血时间。
(7)抗菌性能实验:采用大肠杆菌(E.coil)与金黄色葡萄球菌(S.aureus)来测试水凝胶的表面抗菌活性。分别将实施例2制备的Cgl@Fe、实施例5制备的Cgl@Fe/Bai、实施例6制备的Cgl@Fe/Bai@Fe3O4 NPs凝胶置于24孔板中,用75%酒精浸泡30 min进行消毒,再使用PBS浸泡3次,每次15 min,以去除水凝胶表面及内部残留的75%酒精。每个水凝胶中加入1mL稀释至1×106 CFU/mL的细菌悬浮液,之后共培养24h,含有光热纳米粒的使用808 nm(1W/cm2)光照5 min,使用移液枪吸取各组70μL细菌悬浮液滴在有固体培养基的培养皿中心,将其均匀涂抹在固体培养基上。然后将培养皿放入37℃细菌培养箱中,培养24h后观察菌落的生长情况。
(8)细胞相容性实验:将冻干后实施例2制备的Cgl@Fe、实施例5制备的Cgl@Fe/Bai、实施例6制备的Cgl@Fe/Bai@Fe3O4 NPs凝胶在60℃下灭菌24小时。生长培养基采用90%DMEM培养基(Gibco)、10%胎牛血清(FBS)、1×106 U/L青霉素(Hyclone)和100 mg/L 链霉素(Hyclone)混合。将灭菌后的适量样品在培养基中培养24小时,得到浸出液。将3T3小鼠成纤维细胞以5000~8000个/孔的密度接种到96孔板中。移除先前培养基并补充水凝胶浸出液,共同培养1、3、5天后,通过LIVE/DEAD细胞毒性试剂盒检测法进行评估。
(9)动物实验:本实验用16只健康白色雌性小鼠(约28g)建立伤口模型来评估复合水凝胶对伤口愈合的作用。先用1%戊巴比妥钠麻醉大鼠并对其背部进行脱毛处理,然后在脱毛区域创建一个圆形伤口(直径6mm)。将经过75%酒精消毒的无菌敷料分别敷在大鼠伤口处,对含有Fe3O4 NPs进行808nm(1W/cm2)光照5 min处理。分别拍照并观察0、3、7、14天伤口及愈合情况,评估各组水凝胶对愈合伤口的促进作用。
二、实验结果:
(1)根据图1的FT-IR谱图显示,Csc大分子中1516 cm-1处的特征峰与苯环上-C=C-的伸缩振动吸收峰相对应,而在3312 cm-1处则出现宽峰,对应于酚类羟基和壳聚糖链上的-NH2伸缩振动。当加入Gelatin后,特征峰发生偏移,这可能与分子间形成氢键所释放的能量有关。而当再加入金属离子Fe3+后,吸收峰的强度减弱,这可能与羧酸基团、邻苯二酚基团与金属离子络合所释放的能量有关。
(2)如图2所示,在2分钟内,不同质量比的凝胶均能迅速完成凝胶过程。其中,质量比为3:7的凝胶大约在70秒内完成凝胶过程,而质量比为6:4的凝胶则在约120秒内迅速交联。
(3)如图3所示,其中左图为拉伸,右图为压缩。在拉伸时,当水凝胶的质量比为3:7时,其抗拉强度约为29 Kpa,断裂伸长率约为161%;而当凝胶质量比为6:4时,其抗拉强度约为6.5 Kpa,断裂伸长率约为81%。在压缩情况下,当凝胶在80%应变下压缩时,凝胶质量比为3:7时,其抗压强度约为1.45 Mpa;而凝胶质量比为6:4时,其抗压强度约为0.17 Mpa。这种机械性能差异的主要原因是凝胶中的交联配位键带来的动态延展性,使得不同质量比的水凝胶展现出不同的拉伸和压缩性能。
(4)如图4所示,质量比为6:4的水凝胶黏附剪切强度约为27 Kpa,而质量比为3:7的水凝胶黏附剪切强度约为11 Kpa。水凝胶的黏附主要取决于邻苯二酚与组织的黏附作用。水凝胶表现出较强的黏附力,有利于与周围组织的牢固附着,降低脱离的风险。
(5)如图5所示,左图为不同功率的升温曲线,右图为不同浓度的升温曲线,下方图为实时升温图。在22℃下用激光(808nm,1W/cm2)照射四种不同浓度的物质进行5分钟的升温测试,如右图。随着浓度的增加,温度差也在不断升高。其中,2mg/ml的浓度下的升温差约为22℃,而0.5mg/ml的浓度下的升温差约为11℃。接下来选取2mg/ml的浓度,测试了不同功率下的升温曲线,结果如左图所示。随着功率的增加,升温曲线明显上升。在2W/cm2的最高功率下,升温差约为33℃,而在0.5W/cm2的最低功率下,升温差约为15℃。考虑到人体体表温度在40℃左右,人体可耐受的温度差约为18℃左右。而在1.5W/cm2的功率下,温差约为25℃,而在1W/cm2的功率下,温差约为22℃。因此,1W/cm2的功率下的温差为最佳。将水凝胶与掺入Fe3O4 NPs的红外成像仪进行对比分析,结果显示未掺入Fe3O4 NPs的温度并无变化。而掺入Fe3O4 NPs后的每分钟实时升温图如正图5所示,在5分钟后升温约43℃。
(6)如图6所示,10秒后,空白组和不同质量比凝胶的颜色开始发生变化。180秒后,将试管倒置,血液在空白组中顺管壁下流,而掺入复合凝胶的全血发生凝结现象。这表明凝胶具有凝聚血液的能力。
(7)如图7所示,以空白组、水凝胶组、水凝胶载药组、水凝胶载药与光热剂进行试验对E.coli与S.aureus的抗菌率。水凝胶载药与光热剂(Cgl@Fe/Bai@Fe3O4 NPs)显示了优异的抗菌率,双菌的抗菌率在90%以上,表明在PTT下加载药物能够有效破环细菌结构,抑制细菌的生长。
(8)如图8所示,培养1、3、5天后的小鼠成纤维细胞的荧光染色图像,所有水凝胶均有良好的生物相容性。此外,随着培养时间的延长,细胞数量不断增加且出现细胞伪足,各组水凝胶上的细胞数量及形状几乎没有差异。表明复合水凝胶对细胞毒性很低,具有良好的生物相容性。
(9)如图9所示,图示为大鼠第0、3、7、14天的伤口照片,由于水凝胶提供了湿润的微环境,有利于伤口的愈合。添加水凝胶组在第7天与第0、3天对比均有明显伤口缩小,在第14天后,未添加水凝胶组伤口颜色深红,周围毛发稀少;添加水凝胶组,伤口周围有毛发,红色更浅;在Cgl@Fe/Bai@Fe3O4
NPs为敷料的周期性治疗中,其愈合伤口速度最快,第14天后伤口已经愈合,呈现肉色。以上结果表明水凝胶敷料具有促进伤口愈合的作用。
Claims (9)
1.一种协同光热治疗的动态水凝胶,其特征在于,以壳聚糖为原料,3,4-二羟基苯丙酸为反应物,在催化剂1-乙基-(3-二甲基氨基丙基)碳酰二亚胺与N-羟基琥珀酰亚胺作用下反应得儿茶酚偶联壳聚糖,然后将儿茶酚偶联壳聚糖与明胶、氯化铁、黄芩苷及四氧化三铁纳米粒混合,通过化学交联制备与协同激光下得到动态水凝胶。
2.一种协同光热治疗的动态水凝胶的制备方法,其特征在于,包括以下步骤:
S1、将壳聚糖预先分散在乙酸中充分溶解得到Cs溶液,用蒸馏水溶解3,4-二羟基苯丙酸,得到HCA溶液,将1-乙基-(3-二甲基氨基丙基)碳酰二亚胺与N-羟基琥珀酰亚胺溶于乙醇/水混合溶液中得到EDC/NHS溶液,将HCA溶液加到Cs溶液中,得到Cs/HCA溶液,再将EDC/NHS溶液滴加到Cs/HCA溶液中,在室温下反应24h,经过透析和冷冻干燥制得儿茶酚偶联壳聚糖,利用3,4-二羟基苯丙酸与壳聚糖骨架上的氨基发生反应,得到儿茶酚偶联壳聚糖;
S2、将步骤S1合成的儿茶酚偶联壳聚糖预先分散在去离子水中得到分散液,再将明胶溶液加入到分散液中,再加入氯化铁到分散液中,将黄芩苷溶于磷酸缓冲液后再加入到分散液中,再向分散液中加入四氧化三铁纳米粒,通过化学交联与激光照射下得到一种协同光热治疗的动态水凝胶。
3.根据权利要求2所述的一种协同光热治疗的动态水凝胶的制备方法,其特征在于,步骤S1中,所述壳聚糖与3,4-二羟基苯丙酸的质量比为1:1.1。
4.根据权利要求2所述的一种协同光热治疗的动态水凝胶的制备方法,其特征在于,步骤S1中,所述1-乙基-(3-二甲基氨基丙基)碳酰二亚胺与N-羟基琥珀酰亚胺的摩尔比为1:1,所述1-乙基-(3-二甲基氨基丙基)碳酰二亚胺与N-羟基琥珀酰亚胺的总质量与壳聚糖的质量比为1.5:1。
5.根据权利要求2所述的一种协同光热治疗的动态水凝胶的制备方法,其特征在于,步骤S1中,室温反应时反应溶液的pH为4.5~5.5。
6.根据权利要求2所述的一种协同光热治疗的动态水凝胶的制备方法,其特征在于,步骤S1中,乙醇/水混合溶液中乙醇和水体积比为1:1。
7.根据权利要求2所述的一种协同光热治疗的动态水凝胶的制备方法,其特征在于,步骤S2中,所述儿茶酚偶联壳聚糖的质量浓度为12.5%,所述明胶的质量浓度为12.5%,所述黄芩苷在磷酸缓冲液中的浓度为25mg/ml,所述氯化铁的质量浓度为6%,所述四氧化三铁纳米粒的浓度为2mg/ml,所述激光的波长为808nm。
8.根据权利要求2所述的一种协同光热治疗的动态水凝胶的制备方法,其特征在于,步骤S2中,所述儿茶酚偶联壳聚糖与明胶质量比为6:4、5:5、4:6或3:7,所述氯化铁与儿茶酚偶联壳聚糖的质量比为1:3。
9.根据权利要求1所述的一种协同光热治疗的动态水凝胶在制备皮肤伤口用创面敷料中的应用。
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