title: Application of orthogonal functions to spectrophotometric analysis of the preservatives benzylalcohol, phenol and parabens in aqueous cyanocobalamin solutions.
abstract: The orthogonal polynomials P3 and P2, 12 and 8 points, at 2 nm intervals over certain wavelength ranges were used for the spectrophotometric analysis of benzylalcohol, phenol or parabens in aqueous cyanocobalamin solutions. The 12 point-methods proved to be more sensitive and direct and to have sufficient accuracy and precision.
mesh_terms: D019905:Benzyl Alcohol; D001592:Benzyl Alcohols / Q000032:analysis*; D001593:Benzyl Compounds / Q000032:analysis*; D003124:Colorimetry / Q000379:methods; D010226:Parabens / Q000032:analysis*; D019800:Phenol; D010636:Phenols / Q000032:analysis*; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D014805:Vitamin B 12 / Q000032:analysis*
chemical_list: D001592:Benzyl Alcohols; D001593:Benzyl Compounds; D010226:Parabens; D010636:Phenols; D012996:Solutions; D019800:Phenol; D019905:Benzyl Alcohol; D014805:Vitamin B 12