title: [Influence of methyl esterification on the ultraviolet absorption of gamma-linolenic acid].
abstract: OBJECTIVE
  To study the influence of methyl esterification on the ultraviolet absorption of gamma-linolenic acid.
  
  
  METHODS
  To measure the ultraviolet absorption value of some gamma-linolenic acid product by Ultraviolet Spectrophotometry before and after methyl esterification and to measure the fatty acids formation with gas chromatographic method. Then to do a correlation analysis of the results.
  
  
  RESULTS
  The ultraviolet absorption value of gamma-linolenic acid before methyl esterification was very significantly correlated with that after methyl esterification.
  
  
  CONCLUSIONS
  It is feasible to mesure the ultraviolet absorption value of polyunsaturated fatty acids (such as gamma-linolenic acid) without methyl esterification.
authors.affiliation: School of Biochemical Engineering, Nanyang Institute of Technology, Nanyang 473004, China. guoshux@163.com
authors.forename: Shu-xian
authors.initials: SX
authors.lastname: Guo
authors.forename: Dong-mei
authors.initials: DM
authors.lastname: Wang
authors.forename: Feng-xia
authors.initials: FX
authors.lastname: Liu
authors.forename: Gang
authors.initials: G
authors.lastname: Xue
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Jian-bo
authors.initials: JB
authors.lastname: Feng
mesh_terms: D000042:Absorption / Q000528:radiation effects; D002849:Chromatography, Gas; D004951:Esterification; D008745:Methylation; D031665:Oenothera biennis / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D014466:Ultraviolet Rays; D014508:Urea / Q000737:chemistry; D017965:gamma-Linolenic Acid / Q000032:analysis / Q000737:chemistry*
chemical_list: D017965:gamma-Linolenic Acid; D014508:Urea