超声辐射对悬浮体系中壳聚糖降解的研究  

Study on the degradation of chitosan in suspension systems by ultrasonic radiation

作　　者：陈丽珊 黄永春[1,2] 张昆明[1,2] CHEN Lishan;HUANG Yongchun;ZHANG Kunming(School of Bioiogical and Chemical Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Key Laboratory of Green Processing of Sugar Resources,Liuzhou 545006,China)

机构地区：[1]广西科技大学生物与化学工程学院,广西柳州545006 [2]广西糖资源绿色加工重点实验室(广西科技大学),广西柳州545006

出　　处：《广西科技大学学报》2024年第4期138-144,共7页Journal of Guangxi University of Science and Technology

基　　金：国家自然科学基金项目(31660472)资助。

摘　　要：为探究超声辐射对悬浮体系中壳聚糖降解的影响。以降解后壳聚糖溶液的相对黏度和还原糖质量浓度为评价指标,研究悬浮液pH值、壳聚糖粒径、超声温度、超声功率比和超声时间对壳聚糖降解的影响,并分别对原料及降解产物进行结构表征。结果表明:在悬浮液pH值为5.0、壳聚糖粒径为116μm、超声温度为25℃、超声功率比为80%、超声时间为5 h的实验条件下,降解后溶液还原糖质量浓度从9.98 mg/L增加到188.43 mg/L,相对黏度从1.95降低至1.46;结构表征分析发现,降解后固态壳聚糖结晶度有所提升,推测原因是超声辐射优先作用于壳聚糖的非晶区域;超声辐射处理非均相壳聚糖悬浮液体系,有利于促进固相壳聚糖分子的溶解和降解。For exploring the effect of ultrasonic radiation on chitosan degradation in suspension systems,with the relative viscosity of degraded chitosan solution and the content of reducing sugar as evaluation indicators,the effects of pH of suspension,chitosan particle size,ultrasonic temperature,ultrasonic power and ultrasonic time on the degradation performance of chitosan in suspension system were studied,and the structure of raw materials and degradation products were characterized respectively.The results showed that under the experimental conditions of suspension pH 5.0,chitosan particle size 116μm,ultrasound temperature 25℃,ultrasound power ratio 80%,and ultrasound time 5 h,the reduced sugar content of the degraded solution increased from 9.98 mg/L to 188.43 mg/L,relative viscosity decreased from 1.95 to 1.46;Structural characterization analysis found that the crystallinity of solid chitosan slightly increased after degradation,suggesting that ultrasound radiation preferentially acted on the amorphous region of chitosan.The research results indicate that ultrasonic radiation treatment of heterogeneous chitosan suspension system is beneficial for promoting the dissolution and degradation of solid-state chitosan molecules.

关 键 词：悬浮体系 壳聚糖降解 超声空化 相对黏度 还原糖 

分 类 号：O636.1[理学—高分子化学]