花椰菜中异硫氰酸酯提取物抗氧化活性研究(英文)

Isothiocyanates(ITCs) extracts were prepared from fresh broccoli.Their antioxidant properties were evaluated by using the in vitro bioassays,including superoxide anion radical( 2 O·-) ,hydroxyl radical(HO·-) and 2,2-diphenyl-1-picrylhydracyl(DPPH·) radical-scavenging methods,lipid peroxidation assay,and reducing power assay.The ITCs extracts exhibited significant dose-dependent antioxidant activities(P0.01) .Its antioxidant-stability was affected by temperature and storage condition,although it was more stable than vitamin C(Vc) .GC-MS iden-tified sulforaphane in the ITCs extracts.The antioxidant activity of sulforaphane was approximately one tenth to one fifth of that of Vc.Sulforaphane was experimented to be one of dominating contributors to antioxidant capacity of ITCs extracts.However,there was no direct antioxidant activity found for benzyl isothiocyanate(BITC) in vitro. Therefore,it could be concluded that the general group(-N=C=S) was not the essential part for the antioxidant activity of sulforaphane.It is suggested that the ITCs extracts from broccoli can be developed into a promising food additive for healthy food.     

基于循环经济理念的滨海新区化工产业发展对策研究

介绍滨海新区化工产业循环经济的发展现状,指出目前发展中存在的问题.针对这些问题以及滨海新区化工产业发展的优势和制约因素,提出了经济发展和生态环境保护双赢的化工产业发展对策.     

涤纶短纤维含油率测试方法的比较

采用了萃取称重法、萃取折射率法、快速法、核磁共振法测定了对涤纶短纤维的含油率进行了比较。结果发现,萃取称重法、萃取光折射率法、快速法测定不同油剂的含油率时,应根据油剂的溶解特性,选择不同的溶剂萃取。对于阴离子型烷基磷酸酯钾盐油剂宜选择苯/甲醇(体积比1:1)的混和溶剂。4种分析方法中,萃取称重法测定涤纶短纤维的含油率结果偏高;快速法测定的结果偏低;萃取光折射率法和核磁共振法测定涤纶短纤维的含油率结果准确,精密度较高,能正确反映纤维上油情况。     

涤纶工业长丝含油率测试方法的比较

通过对红外分光光谱法、洗涤减量法及核磁共振法3种涤纶工业长丝含油率测试方法的比较,找出这3种方法之间的不同及相互联系,认为核磁共振法具有测试速度快、操作简单、测试精度高及不需试剂的优点。