不同紫胶膜的降解性能研究  

Degradation Behavior of Different Types of Lac Films

作　　者：徐涓[1,2] 张弘[2] 孙彦琳[1] 周梅村[1] 郑华[2] 李凯[1,2] 李坤[2] 

机构地区：[1]昆明理工大学化学工程学院,云南昆明650224 [2]中国林业科学研究院资源昆虫研究所,云南昆明650224

出　　处：《食品科学》2011年第21期91-97,共7页Food Science

基　　金：科技部农业科技成果转化基金项目(2010GB24320619);国家林业科技成果推广项目([2010]11);国家林业公益性行业科研专项项目(201204602)

摘　　要：采用质量法对3种紫胶膜(原胶、漂白紫胶及片胶膜)的降解性进行研究。结果表明:3种紫胶膜均能够自然降解,且不同紫胶膜随土壤含水率和温度的增加降解速率均加快,随着土壤pH值增加降解速率减慢;对其降解过程建立了动力学方程,同一条件下,漂白紫胶、原胶和片胶膜的降解半衰期依次减小。通过红外光谱(FTIR)、扫描电镜(SEM)以及毛细管黏度计对紫胶膜降解前、后的样品进行表征,显示3种紫胶膜在降解后其分子结构没有发生很大变化,但其形貌和状态发生了明显的变化,并且降解后紫胶膜的相对分子质量明显变小。The degradation behavior of three different types of lac films（seedlac,shellac,and bleached lac） was studied in terms of weight loss rate.Each type of lac film under investigation could be degraded naturally and the degradation rate increased with increasing soil moisture content and temperature but decreased with increasing soil pH.A dynamic model describing their degradation respectively was established.Under the same conditions,the degradation half-lives of bleached lac,seedlac and shellac decreased sequentially.Moreover,their pre-and post-degradation samples were characterized using Fourier transform infrared spectroscopy（FTIR）,scanning electron microscopy（SEM） and capillary viscosimeter,and the results showed that these three types of lac films presented no considerable changes in their molecular structure but revealed significant changes in their morphology and tissue and exhibited a remarkable decrease in their relative molecular weights after degradation.

关 键 词：紫胶 降解 质量法 相对黏度 

分 类 号：TS202.3[轻工技术与工程—食品科学] TQ351.7[轻工技术与工程—食品科学与工程]