茜素-马铃薯淀粉复合膜的制备及其氨响应行为研究

Preparation of alizarin-potato starch composite film and its ammonia response behavior

中文关键词:  茜素  马铃薯淀粉  聚乙烯醇  复合膜  氨响应性

英文关键词:alizarin  potato starch  polyvinyl alcohol  composite film  ammonia responsiveness

中文摘要:

      目的 探究茜素的加入对马铃薯淀粉基复合膜理化性质的影响, 并评估其氨响应行为。方法 以马铃薯淀粉为成膜基质, 通过流延法制备淀粉基生物薄膜, 并在其内部嵌入天然色素—茜素, 制备茜素-马铃薯淀粉复合膜, 通过紫外可见吸收光谱、傅里叶红外光谱等对复合膜的结构进行表征。结果 实验表明, 添加3 mg/mL的茜素对复合膜的厚度、含水量、水接触角、化学和晶体结构均无明显影响, 但显著改善了复合膜的光阻隔性能、拉伸强度、断裂伸长率和热稳定性。在实验室12 W LED T8节能灯正常发光条件下, 复合膜对2500 mg/L的氨水表现出肉眼可见的由黄色到紫色的颜色转变, 且茜素-马铃薯淀粉复合膜的氨响应行为在循环利用4次后并未表现出衰减。结论 茜素可有效改善马铃薯淀粉基复合膜的理化性能, 并使复合膜表现出良好的氨响应行为, 有潜力应用于高蛋白食品新鲜度的日光下可视化检测。

英文摘要:

      Objective To investigate the effect of alizarin addition on the physicochemical properties of potato starch-based composite film, and evaluate its ammonia response behavior. Methods Potato starch was used as the film matrix to prepare a starch-based biological film by the flow elongation method, and the natural pigment alizarin was embedded in the film to prepare the alizin-potato starch composite film. The structure of the composite film was characterized by ultraviolet-visible absorption spectrum and Fourier transform infrared spectrum. Results The experimental results showed that the addition of 3 mg/mL alizarin had no significant effect on the thickness, water content, water contact angle, chemistry and crystal structure of the composite film, but significantly improved the photobarrier performance, tensile strength, elongation at break and thermal stability of the composite film. Laboratory 12 W LED T8 energy-saving lamp under normal luminous conditions, the composite membrane showed a visible color transition from yellow to purple for 2500 mg/L ammonia, and the ammonia response behavior of the alizarin-potato starch complex film did not show attenuation after 4 cycles. Conclusion Alizarin can effectively improve the physicochemical properties of potato starch-based composite film and make the composite membrane exhibit good ammonia response behavior, which has the potential to be used in the visual detection of high protein food freshness under sunlight.