This review covers the progress in recent years on pH-responsive polymers integrated with natural colorants. The classification of various natural colorants, including anthocyanin, curcumin, and alizarin, and the pigments’ structural changes at different pH are introduced. Subsequently, the latest research in substrates for immobilizing natural colorants is discussed. Moreover, their applications on wound dressing for bacterial infections monitoring, smart package for food quality monitoring, and textile dyeing, are outlined. Finally, this study was summarized by emphasizing the current challenges and future opportunities in the field of pH-responsive polymers.

中文翻译：

---

pH响应性聚合物与天然着色剂相结合的最新进展：从制备到应用

本综述涵盖了近年来 pH 响应性聚合物与天然着色剂相结合的进展。介绍了各种天然色素，包括花青素、姜黄素、茜素的分类，以及色素在不同pH值下的结构变化。随后，讨论了固定天然着色剂基质的最新研究。此外，还概述了它们在用于细菌感染监测的伤口敷料、用于食品质量监测的智能包装和纺织品染色方面的应用。最后，总结了本研究，强调了pH响应聚合物领域当前的挑战和未来的机遇。