甲基红-溴百里酚蓝新鲜度指示标签在果蔬保鲜上的应用  

Application of Methyl Red-Bromothymol Blue Freshness Indication Labels on Preservation of Fruits and Vegetables

作　　者：纪文举 田思伟 陈春君 麻吉腾 杨艳青 范新光 JI Wen-ju;TIAN Si-wei;CHEN Chun-jun;MA Ji-teng;YANG Yan-qing;FAN Xin-guang(College of Food Engineering,Ludong University,Yantai 264025,China;Inspection and Testing Center of Muping District,Yantai 264199,China)

机构地区：[1]鲁东大学食品工程学院,山东烟台264025 [2]烟台市牟平区检验检测中心,山东烟台264199

出　　处：《保鲜与加工》2022年第12期1-8,共8页Storage and Process

基　　金：国家自然科学基金项目(31901738);山东省自然科学基金项目(ZR2019PC032);烟台市科技创新发展计划项目(2021XDHZ087);山东省自然科学基金项目(ZR2019BCE037)。

摘　　要：随着生鲜电子商务新业态的发展以及市场对保鲜包装功能要求的提高,制备能够直观表达果蔬新鲜度的指示标签具有重大意义。将甲基红与溴百里酚蓝以体积比3∶2混合作指示剂,以增塑剂聚乙二醇-6000、粘合剂甲基纤维素作成膜基质,制备基于pH值变化的果蔬新鲜度指示标签,并研究其在草莓、生菜包装上的新鲜度指示效果。结果表明:随着贮藏时间的延长,果蔬包装内CO_(2)体积分数不断上升,p H值不断下降;所制备的4种指示标签的颜色均发生变化,其中标签3(50 mL/L甲基红-溴百里酚蓝混合指示剂)和标签4(70 mL/L甲基红-溴百里酚蓝混合指示剂)的颜色变化范围最广,涵盖绿色、黄绿色、橙色和红色4个色系,且标签3的色差值△E与果蔬的新鲜度感官评分的拟合度最高(R^(2)=0.834 6)。因此,50 m L/L的甲基红-溴百里酚蓝新鲜度指示标签的指示效果最好。It is of great significance to prepare indicator labels that can intuitively express the freshness of fruits and vegetables with the development of new fresh e-commerce forms and the improvement of the functional requirements of fresh-keeping packaging.In this study,the mixture of methyl red and bromothymol blue(3∶2)was prepared as an indicator,combined with polyethylene glycol(PEG)-6000 as plasticizer and methyl cellulose as film forming matrix,which was used to prepare freshness indicator labels for fruits and vegetables based on pH changes,aiming to investigate the freshness indicating effects on strawberries and lettuces packaging.The results showed that the volume fractions of CO_(2)in fruits and vegetables packaging were increased continuously,and the pH values were continuously descended with the prolongation of storage time.The color of four prepared indicator labels all changed along with pH values,and label 3(50 mL/L methyl red-bromothymol blue mixed indicator)and label 4(70 mL/L methyl red-bromothymol blue mixed indicator)presented the widest range of color variations,covering 4 color systems of green,chartreuse,orange and red.Among them,the color difference values?△E of label 3 had the highest fit with the sensory scores of freshness of fruits and vegetables(R2=0.8346).Therefore,50 mL/L methyl red-bromothymol blue(3∶2)freshness indicator label was determined as the best indicator.

关 键 词：新鲜度指示标签 甲基红 溴百里酚蓝 果蔬包装 

分 类 号：S609.3[农业科学—园艺学]