Department of Packaging and Materials Technology, Faculty of Agro-Industry, Kasetsart University, Bangkok, Thailand.
Talanta. 2010 May 15;81(3):1126-32. doi: 10.1016/j.talanta.2010.02.008. Epub 2010 Feb 10.
A colorimetric mixed pH dye-based indicator with potential for the development of intelligent packaging, as a "chemical barcode" for real-time monitoring of intermediate-moisture dessert spoilage, is described. This on-package indicator contains mixed pH-sensitive dyes, bromothymol blue and methyl red, that respond through visible color change to carbon dioxide (CO(2)) as a spoilage metabolite. Both indicator solution and indicator label characteristics were studied, as well as their response to CO(2). A kinetic approach was used to correlate the response of the indicator label to the changes in intermediate-moisture dessert spoilage. Color changes, in terms of total color difference of a mixed pH dye-based indicator, correlated well with CO(2) levels of intermediate-moisture dessert. Trials on golden drop have verified that the indicator response correlates with microbial growth patterns in dessert samples, thus enabling the real-time monitoring of spoilage either at various constant temperatures or with temperature fluctuation.
描述了一种基于比色混合 pH 指示剂的智能包装指示剂，可作为“化学条码”，用于实时监测中间水分甜点的变质。这种包装上的指示剂包含混合 pH 敏感染料溴百里酚蓝和甲酚红，它们通过可见的颜色变化对二氧化碳（CO(2)）作为变质代谢物做出响应。研究了指示剂溶液和指示剂标签的特性及其对 CO(2)的响应。采用动力学方法将指示剂标签的响应与中间水分甜点变质的变化相关联。混合 pH 指示剂的总色差的颜色变化与中间水分甜点中的 CO(2)水平很好地相关。对金桔的试验验证了指示剂的响应与甜点样品中微生物生长模式相关，从而能够实时监测变质情况，无论是在不同的恒温下还是在温度波动下。
