title: Simple enzymatic determination of total cholesterol in gallstones.
abstract: In this simple method for rapid enzymatic determination of total cholesterol in human gallstones, gallstone powder is dissolved in an 80/20 by vol mixture of N,N-dimethylformamide and dimethyl sulfoxide and reacted directly with the aqueous enzymatic reagent, without further treatment. The organic solvents do not interfere with enzymatic activities of cholesterol oxidase, esterase, and peroxidase in the assay mixture. The method is reproducible (CVs 3.7% to 6.6%), analytical recoveries ranged from 98.6% to 102%, and linearity is good. Furthermore, results correlated well with those obtained by infrared spectroscopic measurements.
authors.affiliation: Department of Biochemistry, Chang Gung Medical College, Taoyuan, Taiwan, R.O.C.
authors.forename: J S
authors.initials: JS
authors.lastname: Wei
authors.forename: H M
authors.initials: HM
authors.lastname: Huang
authors.forename: W C
authors.initials: WC
authors.lastname: Shyu
authors.forename: C S
authors.initials: CS
authors.lastname: Wu
mesh_terms: D002769:Cholelithiasis / Q000032:analysis*; D002784:Cholesterol / Q000032:analysis*; D002789:Cholesterol Oxidase; D004121:Dimethyl Sulfoxide; D004126:Dimethylformamide; D005583:Fourier Analysis; D006801:Humans; D009195:Peroxidase; D011786:Quality Control; D012044:Regression Analysis; D013053:Spectrophotometry; D013055:Spectrophotometry, Infrared; D002787:Sterol Esterase
chemical_list: D004126:Dimethylformamide; D002784:Cholesterol; D002789:Cholesterol Oxidase; D009195:Peroxidase; D002787:Sterol Esterase; D004121:Dimethyl Sulfoxide