title: [Decoloring and spectral properties analysis of innoxious ultraviolet absorbents].
abstract: The ultraviolet absorbent extracted from mango leaves, was discolored by some decoloring agent. Then the spectral properties of the discolored ultraviolet absorbents were analyzed. The discolored method of ultraviolet absorbent was studied by comparing one with the others. The results showed that the discoloring effect was satisfactory by using active carbon, H2O2, citric acid, and oxalic acid as decoloring agent. Specially, when oxalic acid was used as decoloring agent, the color of the production was slight, the rate of production was high, and the absorption effect of ultraviolet ray was well. When the concentration of the ultraviolet absorbent solution is 0.5% (w/w), the ultraviolet ray transmission was smaller than 0.3% in 200-370 nm, and it increased slightly from 370 nm. There was a maximum value at 400 nm, approaching 12%.
authors.affiliation: Department of Chemistry, Shantou University, Shantou 515063, China.
authors.forename: Yi-Wen
authors.initials: YW
authors.lastname: Fang
authors.forename: Wen-Xiu
authors.initials: WX
authors.lastname: Ni
authors.forename: Chong
authors.initials: C
authors.lastname: Huang
authors.forename: Liang
authors.initials: L
authors.lastname: Xue
authors.forename: Lin
authors.initials: L
authors.lastname: Yu
mesh_terms: D019343:Citric Acid / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D031022:Mangifera / Q000737:chemistry*; D010070:Oxalates / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D013057:Spectrum Analysis / Q000379:methods*; D014466:Ultraviolet Rays
chemical_list: D010070:Oxalates; D010936:Plant Extracts; D019343:Citric Acid; D006861:Hydrogen Peroxide