摘要
以脉冲电场为处理手段,研究电场强度、处理时间、壳聚糖质量浓度和电导率等因素对壳聚糖大分子降解的影响。结果表明:壳聚糖降解产物的相对分子质量随着电场强度的增大而降低,且在高场强下降解显著,电场强度为33.3kV/cm时,降解率达54.2%;降解速率随处理时间的延长逐渐变缓,前20min和后70min的降解率分别为18.5%和8.5%;而壳聚糖质量浓度和电导率的升高则不利于壳聚糖的降解。傅里叶变换红外光谱分析(FT-IR)分析表明,降解前后壳聚糖的侧链结构未发生改变;原料及经相同方法处理过的降解产物在2θ为10.4°和20.2°处均存在X射线衍射峰,表明产物的晶体结构没有发生明显变化。
The effects of electric field strength, reaction time, chitosan concentration and solution conductivity on the degradation rate of chitosan were studied by pulsed electric field （PEF） treatment. The results showed that the molecular weight of chitosan revealed a decrease trend with increasing electric field strength, and a significant degradation was observed at high electric field strength. The degradation rate increased up to 54.2% after PEF treatment at 33.3 kV/cm; the degradation rate revealed a reduction with prolonged reaction time by 18.5% and 8.5% over the first 20 min and the last 70 rain, respectively. Increasing solution concentration or conductivity was unfavorable for the degradation of chitosan. Infrared spectral analysis indicated that the structure of chitosan was not changed during degradation. The X-ray diffraction patterns of original chitosan and degraded chitosan exhibited a similar structure with characteristic peaks at 2 θ of 10.4° and 20.2° , suggesting that degraded chitosan maintains its crystal structure.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2012年第17期6-9,共4页
Food Science
基金
国家自然科学基金项目(21076088)
广州市科技攻关计划项目(09A32080517)
