title: [UV-visible spectrum study on anti-UV damaging plants extraction].
abstract: OBJECTIVE
  To develop nature agent absorbing ultraviolet from plants for preventing UV damage.
  
  
  METHODS
  Conduct ultraviolet visible spectrum scanning to aqueous extraction and alcohol extraction from polygonatum odoratum and onion. And compare the spectrum of Heilongjiang and Hunan polygonatum odoratum extraction. Dilute 5 times of the aqueous and alcohol extraction from 1g Heilongjiang, Hunan polygonatum odoratum to conduct UV visible spectrum scanning. Dilute 50 times of the aqueous and alcohol extraction of 20 g fresh onion and conduct ultraviolet visible spectra scanning.
  
  
  RESULTS
  For the aqueous extraction of Heilongjiang and Hunan polygonatum odoratum by ultraviolet visible spectrum scan, both of them had strong absorption in the 290 nm to 400 nm while the absorption value of Heilongjiang's is slightly lower than the Hunan's in the ultraviolet region (290 nm to 320 nm) and the absorption value of Heilongjiang's was significantly better than Hunan's in the long-wavelength ultraviolet region (320 nm to 400 nm). For alcohol extraction, the absorption values were significantly different from 290 nm to 400 nm. Hunan's was stronger while Heilongjiang's was weaker in 290-320 nm. Onion aqueous extraction had strong absorption only at 358 nm while alcohol extraction has strong absorption from 290 nm to 400 nm.
  
  
  CONCLUSIONS
  Absorption value of polygonatum odoratum aqueous extraction was stronger than alcohol extraction. Onion alcohol extraction in medium and long wave ultraviolet region had strong absorption spectrum.
authors: Qiqihar Medical University, Qiqihar 161006, China.
authors: Leping
authors: L
authors: Wang
authors: Li
authors: L
authors: Li
authors: Feng
authors: F
authors: Xu
authors: Honglian
authors: H
authors: Zhang
authors: Zijian
authors: Z
authors: Sha
mesh_terms: D000042:Absorption; D019697:Onions / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D031384:Polygonatum / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D013471:Sunburn / Q000517:prevention & control; D014466:Ultraviolet Rays
chemical_list: D010936:Plant Extracts