以天然色素为指示剂的水性聚氨酯薄膜的制备及应用  

Preparation and Application of Waterborne Polyurethane Film with Natural Pigment as Indicator

作　　者：杨铎 辛秀兰[1] Duo Yang;Xiulan Xin(School of Light Industry,Beijing Technology and Business University,Beijing 100048,China)

机构地区：[1]北京工商大学轻工科学与工程学院,北京100048

出　　处：《高分子材料科学与工程》2025年第1期125-135,共11页Polymer Materials Science & Engineering

摘　　要：为开发以天然色素为指示剂的聚氨酯型食品品质指示材料,合成了一系列花青素和茜素固含量分别0%,0.2%,0.4%,0.6%,0.8%和1%的水性聚氨酯薄膜,分析了其化学结构、热性能、显色能力,并使用其监控冷藏猪肉品质在1~7 d中的变化。通过pH值、TVB-N值、感官评价等质量指标建立了猪肉品质划分标准,探究了薄膜在食品品质指示中应用的可行性。结果表明,加入花青素与茜素可改善薄膜的热稳定性,将花青素包埋在薄膜中对色素的热稳定性有一定改善;天然色素的加入会降低聚氨酯的结晶能力;随pH值上升,花青素薄膜颜色由绿色向黄褐色变化,茜素薄膜颜色由黄红色向深紫色变化,加入了天然色素的水性聚氨酯薄膜有良好的pH响应性;利用其监控冷藏条件下的猪肉,猪肉品质新鲜时,花青素薄膜呈绿色与蓝绿色,茜素薄膜呈黄红色,猪肉品质次新鲜时,花青素薄膜呈灰褐色,茜素薄膜向紫色加深,猪肉变质后,花青素薄膜呈黄棕色,茜素薄膜呈深紫色。研究结果为聚氨酯基天然色素指示剂开发与应用提供了研究基础。In order to develop polyurethane-based food quality indication material using natural pigments as indicator,a series of waterborne polyurethane films with anthocyanin and alizarin solid contents of 0%,0.2%,0.4%,0.6%,0.8%,and 1%,respectively,were synthesized and analyzed their chemical structure,thermal properties and color rendering ability,and also used to monitor the change of refrigerated pork quality over a period of 1~7 d.The quality indicators such as pH,TVB-N value,and sensory evaluation were used to establish the pork quality classification criteria and to explore the feasibility of film application in food quality indication.The results show that adding anthocyanins and alizarin can improve the thermal stability of the films,and embedding anthocyanins in the films can improve the thermal stability of pigment to a certain extent.The addition of natural pigments will reduce the crystallization capacity of polyurethane.The color of anthocyanin film changes from green to yellow-brown and the color of alizarin film changes from yellow-red to dark purple with the increase of pH,and the waterborne polyurethane films with the addition of natural pigments have good pH-responsiveness;using it to monitor pork under refrigerated conditions,when the quality of pork is not fresh,the anthocyanin film is grayish brown,and the alizarin film is purple.After the pork deteriorates,the anthocyanin film is yellowish brown,and the alizarin film is dark purple.

关 键 词：水性聚氨酯 花青素 茜素 PH响应 品质指示 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]