title: [A comparison of methods of determining 4-pyridoxic acid in urine].
abstract: Routine fluorescent assays for urine 4-pyridoxic acid (4-PA) in variants of lactone 4-PA external standard (variant 1) and internal 4-PA standard (variant 2) were compared to high performance liquid chromatography. Correlation between the two values were defined by specially derived equation. The internal standard is preferable, as variant 1 presents underestimated results. Variant 2 is limited to high 4-PA concentrations, being unfit in low ones for overestimating the data. The chromatography proved most reliable and specific.
authors.forename: N A
authors.initials: NA
authors.lastname: Beketova
authors.forename: O A
authors.initials: OA
authors.lastname: Vrzhesinskaia
authors.forename: V M
authors.initials: VM
authors.lastname: Kodentsova
authors.forename: T G
authors.initials: TG
authors.lastname: Zaburkina
authors.forename: E D
authors.initials: ED
authors.lastname: Bender
authors.forename: L M
authors.initials: LM
authors.lastname: Iakushina
mesh_terms: D000328:Adult; D002851:Chromatography, High Pressure Liquid; D005260:Female; D006801:Humans; D008875:Middle Aged; D011735:Pyridoxic Acid / Q000652:urine*; D013050:Spectrometry, Fluorescence
chemical_list: D011735:Pyridoxic Acid
vernacular_title: Sravnenie metodov opredeleniia 4-piridoksilovoĭ kisloty v moche.