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Updated: Jun 4, 2026

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
Published on: September 7, 2013
Copigmentation triggers the development of skin burning disorder on peach and nectarine fruit [Prunus persica (L.)
Celia M Cantín1, Li Tian, Xiaoqiong Qin
1Department of Plant Sciences, University of California, Davis, California 95616, United States. ccantin@ucdavis.edu
Abstract:
Skin burning is a new type of skin damage related to exposure to high pH values during the brushing-waxing postharvest operations that has been observed recently on some newly released peach and nectarine [Prunus persica (L.) Batsch] cultivars. In this work, we described this skin disorder for the first time and studied its triggers and biological basis. Different skin burning susceptibility was observed after screening 21 peach and nectarine cultivars. The stability of the skin phenolic extracts to pH in the range 7-10 was studied by UV-visible spectroscopy. This study demonstrated that fruit skin phenolics are not stable at high pH and that the transformations occurring at high pH are reversible and time-dependent. The changes on the UV-visible absorption spectra at different pH values pointed out the copigmentation of anthocyanins as the mechanism beyond the skin burning disorder. Finally, some recommendations to minimize this postharvest damage are also discussed.
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