Intelligent packaging, in addition to acting as a food protection barrier, can emit a signal (electric, colorimetric, among others) in real time in response to any change in the initial packaging conditions and food quality. Packaging with pH indicators or pH sensors usually consists of two parts, a solid base and a dye sensitive to the pH change that makes up the colorimetric sensor. The dyes are extracted from various sources of fruits and vegetables or synthetics. At the beginning of the food deterioration process, alteration of the pH occurs; this change is one of the indicators of product quality. Packaging with a pH indicator is a measure that could indicate the quality of the food at the time of purchase or before consumption, making it safer for consumers. Research is being carried out with the aim of improving the characteristics and applicability of these indicators. This review paper presents research results on intelligent pH indicator packaging, with studies covering pigments, polymers, food and packaging solutions, as well as an overview of the materials/technologies used for the development, and the perspectives/challenges that involve this new technology.

智能包装除了充当食品保护屏障外，还可以响应初始包装条件和食品质量的任何变化实时发出信号（电，比色等）。带pH指示剂或pH传感器的包装通常由两部分组成：固体基质和对构成比色传感器的pH敏感的染料。染料是从各种水果，蔬菜或合成材料中提取的。在食物变质过程的开始，pH值发生变化。这种变化是产品质量的指标之一。带有pH指示剂的包装是一种可以在购买时或食用前指示食品质量的措施，从而使消费者更加安全。为了改善这些指标的特性和适用性，正在进行研究。这篇综述文章介绍了智能pH指示剂包装的研究结果，研究内容涉及颜料，聚合物，食品和包装解决方案，以及用于开发的材料/技术概述，以及涉及该新技术的观点/挑战。