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Study of the Physico-chemical Properties and Antioxidant Activity of Extracted Melanins

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Author(s): Pei-Hsing Hsieh | Tu-Fa Lien

Journal: Journal of Agricultural Science
ISSN 1916-9752

Volume: 4;
Issue: 9;
Date: 2012;
Original page

ABSTRACT
Ultraviolet (UV) light tends to cause skin damage; melanin can scavenge reactive oxygen species (ROS) produced from UV to protect skin from damage caused by free radicals. The purpose of this study was to investigate the physico-chemical properties and antioxidant activity of extracted melanins. Melanins were extracted from black tea (BT-melanin), black soybean (BS-melanin) and black-bone silky fowl (SF-melanin); they were then compared with synthetic melanin (SY-melanin). Three kinds of extracted melanins have absorbance ability in broad-spectrum (190-450 nm) wavelength. The experiment’s results indicated that the solubility in 25? water, organic solvents, 1 M NH4OH, and 1 M HCl of the three extracted melanins was similar to the solubility of synthetic melanin. The melanins also showed good stability in various light sources. The extracted melanins could chelate with Fe2+ and Cu2+. An in vitro study showed that the extracted melanin enhanced the survivability of fibroblast cells with 25 ?g mL-1 concentration after UV irradiation (254 nm, 0.09 mW cm2 -1) (p
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