Mechanical and photo-fragmentation processes for nanonization of melanin to improve its efficacy in protecting cells from reactive oxygen species stress

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/105465

Title:	Mechanical and photo-fragmentation processes for nanonization of melanin to improve its efficacy in protecting cells from reactive oxygen species stress
Authors:	陳賜原;Liu, Yi-Cheng;Chen, Sih-Min;Liu, Jhong-Han;Hsu, Hsiang-Wei;Lin, Hoang-Yan;Chen, Szu-yuan
Contributors:	理學院物理學系
Keywords:	Applied physics;CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;COMPARATIVE EVALUATIONS;Disintegration;EPITHELIUM;Femtosecond pulses;Fragmentation;Free radicals;HYDROGEN PEROXIDE;Industrial applications;IRRADIATION;LASER RADIATION;Light irradiation;MELANIN;OXIDATION;OXYGEN;POWDERS;RHODOPSIN;Scavenging;STRESSES;Viability;VISIBLE RADIATION;WATER
Date:	2015-02-14
Issue Date:	2026-04-23 12:29:32 (UTC+8)
Publisher:	American Institute of Physics;Melville: AIP Publishing
Abstract:	摘要： It has been well established ex vivo that melanin has the ability of scavenging free radicals and reactive oxygen species (ROS), besides other functions. Therefore, we propose to utilize nanonized melanin as medication against acute oxidative stress. For this purpose, we developed and characterized two techniques based on mechanical stir and photo-fragmentation using femtosecond laser pulses, respectively, for disintegration of suspended melanin powder to produce nanometer-sized and water-dispersible melanin. This resolves a major obstacle in the medical and industrial applications of melanin. The viabilities of cultured retinal pigment epithelium (RPE) cells exposed to exogenous H2O2 stress and treated with various conditions of melanin and irradiation were compared. It was found that melanin could be nanonized very effectively with the techniques, and nanonized melanin exhibited a much stronger effect than unprocessed melanin on raising the viability of cultured RPE cells under acute ROS stress. The effect was even more prominent without simultaneous light irradiation, promising for effective in vivo application to the whole body. 出版者： Melville: AIP Publishing 出版日期： 2015-02-14 出處： Journal of Applied Physics, 2015-02, Vol.117 (6) 資源來源： AIP Journals (American Institute of Physics) 版權： 2015 AIP Publishing LLC. 識別號： ISSN: 0021-8979 識別號： EISSN: 1089-7550 識別號： DOI: 10.1063/1.4907997
Appears in Collections:	[Department of Physics] journal & Dissertation

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