李增辉,李亚娜,王晓,吴凯旋.pH敏感型紫番茄花青素在壳聚糖膜制备中的应用研究[J].包装工程,2022,43(15):160-166.
LI Zeng-hui,LI Ya-na,WANG Xiao,WU Kai-xuan.Application of pH-sensitive Purple Tomato Anthocyanin inPreparation of Chitosan Film[J].Packaging Engineering,2022,43(15):160-166. |
| pH敏感型紫番茄花青素在壳聚糖膜制备中的应用研究 |
| Application of pH-sensitive Purple Tomato Anthocyanin inPreparation of Chitosan Film |
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| DOI：10.19554/j.cnki.1001-3563.2022.15.018 |
| 中文关键词: 壳聚糖 紫番茄花青素 复合膜 pH敏感性 |
| 英文关键词: chitosan purple tomato anthocyanin composite films pH sensitivity |
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| 中文摘要: |
| 目的 研究紫番茄花青素(PTA)质量分数对复合膜性能的影响，并测试复合膜对不同pH值的颜色响应。方法 以壳聚糖(CS)为基材，PTA为添加剂，采用溶液共混法制备PTA质量分数为0、1%、3%、5%(PTA相对于CS的百分含量)的复合膜。研究PTA质量分数对复合膜接触角、拉伸强度、水蒸气透过率的影响，并通过复合膜对不同pH值的颜色响应考察其pH敏感性。结果 PTA在酸性环境下，呈现紫红色;在中性环境下，呈现淡紫色透明状，接近无色透明状;在碱性环境下，呈现橙黄色。通过对不同质量比(mCS∶mPTA)的PTA/CS复合膜的性能测试，发现PTA的加入降低了复合膜的亲水性，复合膜的拉伸强度和断裂伸长率明显增大。高浓度的PTA/CS复合膜在酸性条件下，颜色变化不太明显，在碱性条件下，复合膜的颜色明显变成了黄色。结论 加入一定量的PTA能够改善膜的力学性能，增强膜的疏水性，提高了膜的pH敏感性。鉴于PTA/CS复合膜具有很多优良的性能，可为制备高性能壳聚糖基食品包装材料提供一定的理论依据。 |
| 英文摘要: |
| The work aims to study the effect of mass fractions of purple tomato anthocyanin (PTA) on the performance of composite films and to test the color response of composite films to different pH values. With chitosan (CS) as the base material and PTA as the additive, composite films with PTA mass fractions of 0, 1%, 3% and 5% (the percentage of PTA relative to CS) were prepared by solution blending method. The effects of PTA mass fractions on the contact angle, tensile strength and water vapor transmission rate of the composite films were investigated, and the pH sensitivity of the composite films was examined by the color response to different pH values. PTA showed purplish red color in acidic environment and became lavender transparent and was close to colorless transparent in neutral environment, and showed orange-yellow color in alkaline environment. The performance of PTA/CS composite films with different mass ratios (mCS∶mPTA) was tested, and it was found that the addition of PTA reduced the hydrophilicity of the composite films, but the tensile strength and elongation at break increased significantly. The color change of the PTA/CS composite films with high concentration was less obvious under acidic conditions, and the color of the composite films became yellow significantly under alkaline conditions. The addition of a certain amount of PTA can improve the mechanical properties of the films and enhance the hydrophobicity. If the pH sensitivity of PTA/CS composite films can be improved, combined with the fact that PTA/CS composite films have many excellent properties, it can provide a certain theoretical basis for the preparation of high-performance chitosan-based food packaging materials. |
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