基于甜菜红素的pH指示膜性能研究  

Study of pH indicator film properties based on betacyanins

作　　者：余惠容 张利 李兴梅 胥小清 赵正禾 陈赛艳 YU Huirong;ZHANG Li;LI Xingmei;XU Xiaoqing;ZHAO Zhenghe;CHEN Saiyan(College of Food Science,Sichuan Agricultural University,Ya’an 625014,China)

机构地区：[1]四川农业大学食品学院,四川雅安625014

出　　处：《食品与发酵工业》2024年第7期190-196,共7页Food and Fermentation Industries

基　　金：四川省科技厅项目(2020YFN0147);四川省科技创新苗子工程资助项目(2021106)。

摘　　要：以甜菜红素为指示剂,木薯淀粉、花生壳纤维素为成膜基材,采用流延法制备pH指示膜,对指示膜进行性能表征,并分析不同甜菜红色素含量对指示膜热稳定性、机械性能、光学性能、含水量、水溶性以及pH敏感性的影响。通过红外光谱及扫描电镜分析发现甜菜红素与成膜基质相容性良好,各基团交联稳定。结果表明,40%(质量分数)的甜菜红素提高了指示膜的热稳定性能、紫外光阻隔性、断裂伸长率和水润胀率(33.54%至45.94%),降低了指示膜的含水率(15.33%至13.00%)和拉伸强度(7.69 MPa至2.22 MPa),熔点从105℃升至125℃。指示膜表现出良好的pH敏感性,在酸性环境下呈暗红色,中性时呈酒红色,碱性时呈黄色/紫色,色差均大于5,肉眼可视。表明甜菜红素pH指示膜具有广阔的开发前景。The pH indicator film was prepared with betacyanins as an indicator,cassava starch(CS)and peanut shell cellulose(PSC)as film substrates through the film casting method.The performance of the pH indicator film was characterized and analyzed including the effects of different beet red pigment content on the thermal stability,mechanical properties,optical properties,water content,water solubility and pH sensitivity of the pH indicator film.The excellent compatibility of betacyanins with CS and PSC and cross-linking stability were confirmed by Fourier transform infrared spectroscopy and scanning electron microscope analysis.It found that the thermal stability,UV light barrier,elongation at break,and water swelling ratio(33.54%to 45.94%)of pH indicator film were improved and the moisture content(15.33%to 13.00%)and tensile strength(7.69 MPa to 2.22 MPa)pH indicator film were reduced by betacyanins(40%of cassava starch,mass fraction),especially.However,the melting point rose from 105℃to 125℃.This indicator film had excellent pH sensitivity.It was dark red in an acidic environment,wine red in a neutral environment,and yellow/purple in an alkaline environment.The color difference was greater than 5 and visible to the naked eye.The results showed that the pH indicator film with betacyanins had great potential.

关 键 词：pH指示膜 甜菜红素 花生壳纤维素 木薯淀粉 复合膜 

分 类 号：TS206.4[轻工技术与工程—食品科学]