Polyphenolic sunscreens for photoprotection

Abstract

Polyphenols are a class of compounds widely existing in living species ranging from plants, fungi, bacteria to animals, and possess various interesting functions such as anti-inflammatory, immunomodulatory, anti-oxidative and anti-ultraviolet...

Robust and multifunctional natural polyphenolic composites for water remediation

“…16 Along with the discovery of their intrinsic adhesive property and biocompatibility, natural polyphenols have also been regarded as suitable candidates to prepare biomaterials with a variety of fascinating functions ( e.g. , antioxidant, antimicrobial, antiviral, myocardial protection, and immune-regulatory ability), 17,18 which can meet the needs of diverse healthy and biomedical applications, such as tissue engineering, 19 cancer therapy, 20 theranostic, 21 sunscreen, 22 and hair dye. 23 Especially, benefiting from rich dynamic covalent interactions and strong non-covalent interactions between catechol/pyrogallol groups and other structures, natural polyphenols can be easily conjugated with many kinds of building blocks to develop multifunctional and different dimensional composite materials, which broaden the multiple applications.…”

Degradable and Recyclable Solar Desalination Membranes Based on Naturally Occurring Building Blocks

“…Naturally occurring molecules often offer us opportunities to fabricate functional materials with desirable properties. − Gallic acid (GA) is a typical kind of naturally occurring polyphenolic compound available from many fruits and vegetables. , GA can coordinate with Fe­(III) in an aqueous solution through its pyrogallol and carboxylic groups, resulting in ink-like products with a broad range of light absorption. − Besides, GA and Fe­(III) are both harmless and commonly found in plants and animals as micronutrients. The GA@Fe­(III) network can not only form stable versatile adhesive coatings but also be able to degrade quickly in acidic conditions without generating harmful degradation products. − Moreover, hydrophilic poly­(vinylidene fluoride) (PVDF) is selected as a substrate because of its high porosity, outstanding mechanical properties, and chemical stability .…”

Robust Natural Polyphenolic Adhesives against Various Harsh Environments

“…One of the possible ways toward this quest is to seek nature as a resource of building blocks or inspiration. , In nature, many organisms (i.e., mussels, clingfish, barnacles, geckos, and castle worms) have evolved an excellent mechanism to solve the problem of underwater adhesion. − Note that the selection and use of widespread naturally occurring molecules may hold the key to the development of new functional adhesives. , Natural polyphenols, a family of polyphenolic biomolecules abundant in vegetables, fruits, and other plants (i.e., green tea, grape seed, pomegranate peel, apple, tannin, and so on), have been regarded as one of the most important and typical natural adhesives. − Benefiting from these structural and functional features, the presence of multiple phenolic groups within natural polyphenols and their extracts could perform strong interactions with different substrates for efficient adhesion in various environments. − For now, catechol-based adhesives have achieved many progresses due to their adhesion to almost any kind of surface in various applications including industry, marine, and biomedical applications. ,, Although numerous catechol and synthetic polyphenol-based adhesives have been well documented, several problems, such as the sophisticated preparation, limited tolerance to high pH, easy oxidation, and low bonding strength under organic solvents, may hinder the practical applications of these adhesives. − It is still urgently needed to address these issues by fabricating new kinds of natural polyphenol hydrogels for adhesive applications against various harsh environments.…”

“…One of the possible ways toward this quest is to seek nature as a resource of building blocks or inspiration. 17,18 In nature, many organisms (i.e., mussels, clingfish, barnacles, geckos, and castle worms) have evolved an excellent mechanism to solve the problem of underwater adhesion. 19−23 Note that the selection and use of widespread naturally occurring molecules may hold the key to the development of new functional adhesives.…”