摘要
随着人们生活质量的不断提高,食品的质量问题也日益受到关注.可视化智能包装材料可以通过颜色的变化,实现对食品新鲜度的实时监测.然而,由于智能包装材料响应时间长,指示剂的泄漏加重食品污染,制约了可视化智能包装材料的发展和应用.将吩噻嗪类阳离子染料天青B(Azure B)通过阴阳离子静电相互作用固定到聚丙烯酰胺-丙烯酸水凝胶中,利用其对生物胺敏感的特性,制备出了响应快、低泄漏的可视化智能包装水凝胶薄膜材料——丙烯酰胺与天青B丙烯酸盐交联水凝胶(PAMA-Az).研究结果表明PAMA-Az薄膜材料能够实现pH和生物胺的快速响应,在氨气、挥发性盐酸的模拟实验中也表现出变色的可逆性.和共混的天青B水凝胶相比,离子间静电相互作用显著降低了指示剂的迁移率,防止了指示剂的泄露.快响应、低泄露的PAMA-Az凝胶薄膜材料成功应用于鲜虾的新鲜度的监测.
With the continuous improvement of life quality,the demand for higher food quality has risen.Traditionally printed information on food packaging,such as production date and shelf life,falls short of assessing food quality and freshness adequately.Visual intelligent packaging can determine the freshness of food by changing colors,but the potential for food contamination due to pH indicator leakages with long response time poses a threat to food safety and quality.Therefore,polymer dyes that exhibit good biocompatibility,rapid pH response,and resistance to migration are increasingly essential in visually intelligent packaging applications.The phenothiazine cationic dye Azure B,which is sensitive to pH fluctuations,was incorporated into a poly(acrylamide-acrylic acid)hydrogel by electrostatic interactions.The research scrutinized the internal cross-linking of the synthesized hydrogel film(PAMA-Az)using Fourier transform infrared spectroscopy and evaluated the mobility of Azure B within the hydrogel through a UV spectrum.Furthermore,a comprehensive assessment of the physical and chemical properties of PAMA-Az,including discoloration response,mechanical strength,swelling behavior,ammonia gas sensitivity,and color reversibility,was conducted.Results indicated that the pH-responsive PAMA-Az formed by electrostatic interactions possessed a more compact structure,improved color-changing responsiveness,and lower Azure B mobility compared to the blending hydrogel.The color transition of PAMA-Az from blue to lavender and finally pink within the pH range of 7-12,coupled with its swift response to ammonia vapor and color reversibility,highlights its potential for visual food intelligent packaging.In a shrimp freshness monitoring experiment,the PAMA-Az hydrogel film,used as a contact substrate,successfully achieved the visual assessment of shrimp freshness,where a color change from blue to pink signaled rotting.Consequently,the fast-response and lowmobility pH-responsive hydrogel film demonstrates promising applications in visual food intelligent packaging and gas-sensitive labeling.
作者
周长凯
方鹏达
张昊
孙哲
严锋
Chang-kai Zhou;Peng-da Fang;Hao Zhang;Zhe Sun;Feng Yan(Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials,Jiangsu Key Laboratory of Advanced Negative Carbon Technologies College of Chemistry,Suzhou Key Laboratory of Soft Material and New Energy,College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou 215123)
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2024年第11期1518-1528,共11页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号52333002)资助项目.
关键词
PH响应
天青B
静电相互作用
水凝胶薄膜
智能包装
pH-responsive
Azure B
Electrostatic interaction
Hydrogel film
Intelligent packaging
作者简介
通信联系人:孙哲,E-mail:zsun@suda.edu.cn。
