What is it about?
This review examines hydrogels as biocompatible, water‑rich polymeric networks designed to deliver plant‑derived (poly)phenols—bioactive molecules with wide therapeutic potential but limited by poor solubility and bioavailability. The authors describe how hydrogel properties can be tuned through polymer chemistry, cross‑linking strategies, and functionalization approaches to improve loading, stability, and controlled release of polyphenols. Recent advances include hydrogels that respond to internal or external stimuli (pH, temperature, light, magnetic fields), systems decorated to facilitate interaction with biological targets, and polymeric matrices optimized to incorporate polyphenols with different physicochemical features. Several prototype hydrogel formulations have been proposed for applications in skin and epithelial disorders, wound healing, UV‑induced damage, burns, psoriasis, and certain epithelial cancers.
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Why is it important?
Polyphenols such as flavonoids and phenolic acids show antioxidant, anti‑inflammatory, and antimicrobial activities but are limited by rapid metabolism and low aqueous solubility. Hydrogels offer a versatile platform that can improve their delivery, allowing localized administration, sustained release, and enhanced tissue retention. The ability to modulate hydrogel responsiveness makes them suitable for targeted or stimuli‑controlled delivery strategies. These systems are attractive for topical and mucosal applications, where hydration, biocompatibility, and mechanical protection are valuable. The combination of hydrogel adaptability and the multifaceted biological properties of polyphenols supports the development of innovative therapeutic approaches.
Perspectives
Most hydrogel‑based systems described in the review have been tested in vitro, ex vivo, or in animal models. Translating them into clinical applications requires evaluation of long‑term safety, biocompatibility, biodegradation profiles, and reproducibility of manufacturing. Key challenges include scale‑up, quality control, and variability introduced by complex hydrogel chemistries. Future studies should investigate polyphenol stability within hydrogels, release kinetics in physiological environments, and the influence of polymer composition on therapeutic outcomes. Stimuli‑responsive and targeted hydrogels—such as HA‑based carriers for CD44‑expressing tumors or pH‑modulated systems for colon delivery—represent promising directions that require further validation before clinical deployment.
Prof. Antonio Speciale
University of Messina
Read the Original
This page is a summary of: Hydrogels for the Delivery of Plant-Derived (Poly)Phenols, Molecules, July 2020, MDPI AG,
DOI: 10.3390/molecules25143254.
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