本文主要研究内容
作者孙香(2019)在《EGCG类脂质体及其冷冻解冻凝胶的制备与性能研究》一文中研究指出:表没食子儿茶素没食子酸酯(EGCG)是茶叶中茶多酚的主要成分,具有抗衰老、美白等功效,但由于分子结构中含有多个酚羟基,存在稳定性差、生物利用率低的缺点,限制了其在化妆品中的应用。类脂质体具有双分子层结构,可以包覆水溶性及脂溶性药物并提高被包物质的稳定性和生物利用率,且相较于脂质体具有成本低、稳定性好等优点。因此,本论文首先将EGCG包载于类脂质体中,制得EGCG类脂质体(EN),并对其稳定性、透皮效果及生物活性进行表征;在此基础上,以聚乙烯醇(PVA)和透明质酸(HA)为凝胶基质,通过冷冻解冻法制得PVA/HA/EN冷冻解冻凝胶,旨在解决EGCG的应用局限,拓宽其在化妆品领域的应用前景。首先,采用乙醇注入法制备EN,以粒径、多分散系数(PDI)、包封率和载量为指标分别优化了高速分散的转速、时间以及EN的水化介质,确定了最佳制备条件:选用去离子水为水化介质,以12000 r/min的转速高速分散1 min,该条件下制得的EN粒径在60 nm左右,PDI为0.189±0.020,包封率和载量分别为79.4%、7.97%。此外,水化介质盐浓度的增大或pH的减小均会导致EN的粒径增大,且EN在碱性条件下不稳定。室温下的储藏实验显示,EGCG经类脂质体包埋,避光保存60天后,保留率由0增加到61.2%。其次,采用Franz扩散池探究EN在猪皮上的透皮效果,并选用人皮肤成纤维(HSF)细胞探究EN的细胞抗氧化性(CAA)与抗UVA损伤的能力。透皮实验结果表明,相较于EGCG水溶液(ES)、EGCG与空白类脂质体的混合物(NE),EN的透皮效果最好,角质层及角质层以下皮肤中所测得的EGCG含量均为最高。进一步通过全反射傅里叶红外光谱仪对猪皮表征,探究类脂质体透皮机理,结果表明EN提高了角蛋白的水合作用,并改变了角蛋白的二级结构,从而降低了角质层的屏障功能,促进药物的经皮渗透。且随着类脂质体的透入,角质层的脂质含量提高,脂质流动性降低。CAA实验结果表明,以ES为对照,EGCG经类脂质体包埋后,其EC50值从2.6μg/mL降低到1.2μg/mL,细胞抗氧化性增强;UVA诱导细胞损伤实验显示,以ES孵育的细胞为对照,细胞经EN孵育后,细胞存活率从88.0%提高到103.4%,细胞抗UVA损伤的能力提高。最后,采用冷冻解冻法将EN载入PVA/HA复合凝胶中,制得PVA/HA/EN冷冻解冻凝胶。结果表明,随着冷冻解冻循环次数的增加,PVA/HA/EN冷冻解冻凝胶的交联度增加,结构更加致密,凝胶强度增大,凝胶的释放速度更加缓慢。HA质量分数为0.5%时,储能模量G’最大,达到687 Pa,凝胶结构最为致密。以PVA/HA/ES冷冻解冻凝胶为对照,PVA/HA/EN冷冻解冻凝胶24 h内的释放率由69.04%降低到53.96%,室温下储藏2个月后的保留率由83.53%提高到98.13%,透皮总量由0.22μg/cm2提高到0.49μg/cm2。
Abstract
biao mei shi zi er cha su mei shi zi suan zhi (EGCG)shi cha xie zhong cha duo fen de zhu yao cheng fen ,ju you kang cui lao 、mei bai deng gong xiao ,dan you yu fen zi jie gou zhong han you duo ge fen qiang ji ,cun zai wen ding xing cha 、sheng wu li yong lv di de que dian ,xian zhi le ji zai hua zhuang pin zhong de ying yong 。lei zhi zhi ti ju you shuang fen zi ceng jie gou ,ke yi bao fu shui rong xing ji zhi rong xing yao wu bing di gao bei bao wu zhi de wen ding xing he sheng wu li yong lv ,ju xiang jiao yu zhi zhi ti ju you cheng ben di 、wen ding xing hao deng you dian 。yin ci ,ben lun wen shou xian jiang EGCGbao zai yu lei zhi zhi ti zhong ,zhi de EGCGlei zhi zhi ti (EN),bing dui ji wen ding xing 、tou pi xiao guo ji sheng wu huo xing jin hang biao zheng ;zai ci ji chu shang ,yi ju yi xi chun (PVA)he tou ming zhi suan (HA)wei ning jiao ji zhi ,tong guo leng dong jie dong fa zhi de PVA/HA/ENleng dong jie dong ning jiao ,zhi zai jie jue EGCGde ying yong ju xian ,ta kuan ji zai hua zhuang pin ling yu de ying yong qian jing 。shou xian ,cai yong yi chun zhu ru fa zhi bei EN,yi li jing 、duo fen san ji shu (PDI)、bao feng lv he zai liang wei zhi biao fen bie you hua le gao su fen san de zhuai su 、shi jian yi ji ENde shui hua jie zhi ,que ding le zui jia zhi bei tiao jian :shua yong qu li zi shui wei shui hua jie zhi ,yi 12000 r/minde zhuai su gao su fen san 1 min,gai tiao jian xia zhi de de ENli jing zai 60 nmzuo you ,PDIwei 0.189±0.020,bao feng lv he zai liang fen bie wei 79.4%、7.97%。ci wai ,shui hua jie zhi yan nong du de zeng da huo pHde jian xiao jun hui dao zhi ENde li jing zeng da ,ju ENzai jian xing tiao jian xia bu wen ding 。shi wen xia de chu cang shi yan xian shi ,EGCGjing lei zhi zhi ti bao mai ,bi guang bao cun 60tian hou ,bao liu lv you 0zeng jia dao 61.2%。ji ci ,cai yong Franzkuo san chi tan jiu ENzai zhu pi shang de tou pi xiao guo ,bing shua yong ren pi fu cheng qian wei (HSF)xi bao tan jiu ENde xi bao kang yang hua xing (CAA)yu kang UVAsun shang de neng li 。tou pi shi yan jie guo biao ming ,xiang jiao yu EGCGshui rong ye (ES)、EGCGyu kong bai lei zhi zhi ti de hun ge wu (NE),ENde tou pi xiao guo zui hao ,jiao zhi ceng ji jiao zhi ceng yi xia pi fu zhong suo ce de de EGCGhan liang jun wei zui gao 。jin yi bu tong guo quan fan she fu li xie gong wai guang pu yi dui zhu pi biao zheng ,tan jiu lei zhi zhi ti tou pi ji li ,jie guo biao ming ENdi gao le jiao dan bai de shui ge zuo yong ,bing gai bian le jiao dan bai de er ji jie gou ,cong er jiang di le jiao zhi ceng de bing zhang gong neng ,cu jin yao wu de jing pi shen tou 。ju sui zhao lei zhi zhi ti de tou ru ,jiao zhi ceng de zhi zhi han liang di gao ,zhi zhi liu dong xing jiang di 。CAAshi yan jie guo biao ming ,yi ESwei dui zhao ,EGCGjing lei zhi zhi ti bao mai hou ,ji EC50zhi cong 2.6μg/mLjiang di dao 1.2μg/mL,xi bao kang yang hua xing zeng jiang ;UVAyou dao xi bao sun shang shi yan xian shi ,yi ESfu yo de xi bao wei dui zhao ,xi bao jing ENfu yo hou ,xi bao cun huo lv cong 88.0%di gao dao 103.4%,xi bao kang UVAsun shang de neng li di gao 。zui hou ,cai yong leng dong jie dong fa jiang ENzai ru PVA/HAfu ge ning jiao zhong ,zhi de PVA/HA/ENleng dong jie dong ning jiao 。jie guo biao ming ,sui zhao leng dong jie dong xun huan ci shu de zeng jia ,PVA/HA/ENleng dong jie dong ning jiao de jiao lian du zeng jia ,jie gou geng jia zhi mi ,ning jiao jiang du zeng da ,ning jiao de shi fang su du geng jia huan man 。HAzhi liang fen shu wei 0.5%shi ,chu neng mo liang G’zui da ,da dao 687 Pa,ning jiao jie gou zui wei zhi mi 。yi PVA/HA/ESleng dong jie dong ning jiao wei dui zhao ,PVA/HA/ENleng dong jie dong ning jiao 24 hnei de shi fang lv you 69.04%jiang di dao 53.96%,shi wen xia chu cang 2ge yue hou de bao liu lv you 83.53%di gao dao 98.13%,tou pi zong liang you 0.22μg/cm2di gao dao 0.49μg/cm2。
论文参考文献
论文详细介绍
论文作者分别是来自江南大学的孙香,发表于刊物江南大学2019-10-21论文,是一篇关于类脂质体论文,透皮论文,生物利用率论文,冷冻解冻凝胶论文,江南大学2019-10-21论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自江南大学2019-10-21论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。
标签:类脂质体论文; 透皮论文; 生物利用率论文; 冷冻解冻凝胶论文; 江南大学2019-10-21论文;