کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
21309 43216 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Isolation, characterization of melanin derived from Ophiocordyceps sinensis, an entomogenous fungus endemic to the Tibetan Plateau
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Isolation, characterization of melanin derived from Ophiocordyceps sinensis, an entomogenous fungus endemic to the Tibetan Plateau
چکیده انگلیسی

Melanins are pigments of high molecular weight formed by oxidative polymerization of phenolic or indolic compounds. In this present study, a black pigment was isolated from the fermentation broth of Ophiocordyceps sinensis, an entomogenous fungus which is endemic to the Tibetan Plateau by alkaline extraction, acid hydrolysis, and repeated precipitation. It was designed as melanin since the physical and chemical properties including its ultraviolet (UV) and infrared (IR) spectra of the black pigment conformed to the characteristic of melanin and similar to the commercial synthetic melanin. The antioxidant activity of melanin derived from O. sinensis was evaluated. They showed much stronger scavenging abilities on 1,1-diphenyl-2-picrylhydrazyl (DPPH
• ) and the chelating ability on ferrous ions than that of the water extract from the mycelia of O. sinensis, with IC50 value 18.51 ± 0.85 μg/ml and 2.58 ± 0.26 μg/ml, separately. This is the first report of melanin from O. sinensis and will be helpful for the study on the physiology and the artificial cultivation of this fungus, an endangered species.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Bioscience and Bioengineering - Volume 113, Issue 4, April 2012, Pages 474–479
نویسندگان
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