Thanaka (H. crenulata, N. crenulata, L. acidissima L.): A Systematic Review of Its Chemical, Biological Properties and Cosmeceutical Applications

Abstract

Thanaka (H. crenulata, N. crenulata, L. acidissima L.) is a common tree in Southeast Asia used by the people of Myanmar to create their distinctive face makeup meant for daily sun protection and skincare. Moreover, it is used as a traditional remedy to treat various diseases since it can also be applied as an insect repellent. In this systematic review, the chemical and biological properties of Thanaka have been summarised from 18 articles obtained from the Scopus database. Various extracts of Thanaka comprise a significant number of bioactive compounds that include antioxidant, anti-ageing, anti-inflammatory, anti-melanogenic and anti-microbial properties. More importantly, Thanaka exhibits low cytotoxicity towards human cell lines. The use of natural plant materials with various beneficial biological activities have been commonly replacing artificial and synthetic chemicals for health and environmental reasons as natural plant materials offer advantages such as antioxidant, antibacterial qualities while providing essential nourishment to the skin. This review serves as a reference for the research, development and commercialisation of Thanaka skincare products, in particular, sunscreen. Natural sunscreens have attracted enormous interests as a potential replacement for sun protection products made using synthetic chemicals such as oxybenzone that would cause health issues and damage to the environment.