【作者】 杨晨； 吴继红； 劳菲；

【Author】 Yang Chen;Wu Jihong;Lao Fei;China Agricultural University;National Engineering Research Center for Fruit and Vegetable Processing,Key Laboratory of Fruit and Vegetable Processing,Ministry of Agriculture and Rural Affairs,Beijing Key Laboratory for Food Non-thermal Processing;

【机构】 中国农业大学食品科学与营养工程学院； 国家果蔬加工工程技术研究中心农业农村部果蔬加工重点实验室北京市食品非热加工重点实验室；

【摘要】 花色苷和维生素C(VC)是果蔬汁饮料中的光敏性成分,对感官与营养品质有重要影响。为探索光照对透明包装果蔬汁饮料货架期品质变化的规律,以石榴汁为模型,用经离子交换柱纯化的花色苷,构建初始花色苷含量为30mg/L的无VC真实饮料体系、1000 mg/LVC真实饮料体系、无VC且pH与真实饮料相同的糖水模拟饮料体系、1000mg/LVC模拟饮料体系四个试验组,室温下置于全程光照、12 h/12 h光照/避光、全程避光条件下进行21天贮藏实验,测定过程中花色苷、VC、多酚含量、色泽变化,解析花色苷和VC降解动力学。结果表明:8 W LED灯的光照和VC均会加速花色苷损失,且VC的作用更显著;光照时间延长会显著降低花色苷的稳定性:真实饮料体系花色苷避光半衰期(40.1天)为全程光照半衰期的2.14倍,模拟饮料体系花色苷避光半衰期(96.3天)为全程光照半衰期的2.82倍。本研究为富含VC与花色苷的果蔬汁饮料货架期间品质保持提供了一定参考。更多还原

【Abstract】 Anthocyanin and Vitamin C(VC) are light-sensitive components in fruit and vegetable juice and beverage,which have important effects on sensory and nutritional quality.To analyze the effect of the length of light expose on the beverage quality stability,the pomegranate anthocyanins were purified by ion exchange column,and four matrices with an identical initial anthocyanin content of 30 mg/L were constructed.The four matrices were generated to mimic the pomegranate juice,including real beverage matrix(without VC),real beverage matrix(1000 mg/L VC),model beverage matrix without VC and with the same pH and Brix as real beverages,model beverage matrix(1000 mg/L VC).Then the matrices were stored in different light expose length including full light,12 h/12 h light/dark cycle and full dark for 21 days,the changes of anthocyanin content,VC content,color change were determined,and the degradation kinetics of anthocyanin and VC under different light conditions were analyzed.The results showed that 8 W LED light expose and VC accelerated the loss of anthocyanin,and the effect of VC was more significant;the prolongation of light expose significantly decreased the stability of anthocyanin:the half-life of anthocyanin in the real beverage matrix was 2.14 times of that under the full light expose,and the anthocyanin in the model beverage matrix under dark was 2.82 times to that under the full light expose(96.3 days).This research provided reference for shelf life qualitymaintenance of fruit and vegetable juice beverage rich in anthocyanins and vitamin C.更多还原