破碎温度对番茄浆流变性质与果胶分子结构的影响  

Breaking Temperatures Study on Rheological Properties of Tomato pulps and Size and Molecular Weight Distri bution of Pectin

作　　者：罗昌荣[1] 麻建国[1] 许时婴[1] 

机构地区：[1]无锡轻工大学食品学院,214036

出　　处：《食品科学》2001年第8期24-29,共6页Food Science

摘　　要：对在不同破碎温度下所得番茄浆的动态流变性质以及果胶物质分子量的分布和大小进行了研究。结果表明：随着破碎温度的增加，番茄浆中果胶物质的平均分子量增加，但当破碎温度为90℃时，果胶物质的平均分子量却有所下降。在80℃和85℃破碎时，番茄浆具有相当大的贮能模量，而在75℃和90℃破碎时，贮能模量值较小。贮能模量值对振荡频率具有一定的依赖性，故番茄浆表现出弱凝胶特性。贮能模量G′和损耗模量G″交汇点的位置随着破碎温度的升高而向低频区移动。这说明破碎温度越高，大分子物质被保留得愈多，体系呈较强的弹性；破碎温度越低，体系中大分子物质被保留得越少，体系呈较强的粘性。The rheological properties and the size and molecular weight distribution of pectin of tomato pulps broken at different temperatures were investigated.The average molecular weight of pectic substances in tomato polps increased with the increasing of breaking temperatures,while the value decreased when tomato was broken up to 90℃.Dynamic shear data revealed that tomato pulps broken at 80℃and 85℃had relatively high storage moduli.Which dependent on oscillatory frequencies to some extent.So the pulps exhibited weak gel properties.The positions of crossover point of storage moduli G′and loss moduli G″moved toward low frequencies with the increase of breaking temperature.It reflected that the higher the temperature was,the more macromolecular substances were retained in tamato pulp,and also stronger the elastic properties became,and vice versa.

关 键 词：番茄 破碎温度 果胶 贮能模量 损耗模量 番茄浆 流变性质 

分 类 号：TS255.1[轻工技术与工程—农产品加工及贮藏工程] TS255.43[轻工技术与工程—食品科学与工程]