| 摘要: |
| 目的 为更便捷地指示食品包装袋内 CO2浓度变化情况，研究一种 CO2含量指示剂。 方法 以对pH变化敏感的指示剂为原料， 以 CO2-H2O 体系 pH值估算方法为理论基础， 运用基于 L*a*b*颜色空间的指示溶液颜色比色体系， 研究 CO2含量指示剂 。 结果 通过测得不同 CO2浓度环境下碳酸溶液的 pH值，运用数学分析软件模拟CO2浓度与体系中碳酸溶液pH值之间的函数关系，拟合得出了相关性较高的 CO2含量与 pH 值的相关性模型。 基于此模型， 综合考虑色阶数量、颜色变化显著程度等因素， 获得了指示剂配方， 即甲基红与溴百里酚蓝的质量比为 3∶2、质量分数为 5%的溶液。 结合色差显著性、感官分析结果， 采用 Photoshop 软件在 L*a*b*空间对颜色进行仿真还原， 分析出该指示剂在处于 CO2的体积分数分别为 0， 5%， 7%， 13%， 18%， 34%， 43%， 61%， 78%的环境时能产生明显的颜色变化。 结论 甲基红与溴百里酚蓝的质量比为 3∶2、质量分数为 5%的溶液可作为食品包装内 CO2浓度变化指示剂。 |
| 关键词: 指示剂 二氧化碳 食品包装 |
| DOI： |
| 分类号:TS206 |
| 基金项目: |
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| Carbon Dioxide Indicator Used in Food Packaging |
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HU Yun-feng1,2, CHEN Jun-ran1, HE Ye-xin1, CUI Han-yuan2, HU Han-yan1
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1.Tianjin University of Science and Technology， Tianjin 300457， China;2.Tianjin Food Engineering Center， Tianjin 300457， China
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| Abstract: |
| Objective In order to indicate the change of the carbon dioxide content in food packaging more conveniently, a kind of carbon dioxide indicator was studied in this paper. Methods The paper used pH-sensitive indicators as materials and took the estimation method of pH in CO2-H2O system as the theoretical basis to study carbon dioxide indicator. And the colorimetric system of the indicator color based on Lab color space was also used in the paper. Results By means of measuring pH of carbon acid solution under different CO2 concentrations and using the mathematical analysis software to simulate functional relation between CO2 concentrations and pH of carbon acid solution, a high correlation model of carbon dioxide content and pH value was derived by model fitting. Based on the model and overall consideration factors such as the quantity of color gradation and color change degree, we got an indicator formula∶methyl red： bromothymol blue=3 ∶ 2 and the concentration was 5%. Combining the significance analysis of chromatic aberration, sensory evaluation and the color simulation, we found that the indicator could produce obvious color changes in the carbon dioxide concentrations of 0, 5%, 7%, 13%, 18%, 34%, 43%, 61% and 78%. Conclusion The solution composed of 3/5 methyl red and 2/5 bromothymol blue could be used as a carbon dioxide indicator and the mass concentration of the indicator solution was 5%. |
| Key words: indicator carbon dioxide food package |
