The determination of ascorbic acid in urine with phospho-18-tungstic acid
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چکیده
منابع مشابه
KINETIC DETERMINATION OF ASCORBIC ACID a WITH SPECTROPHOTOMETRIC DETECTION
A simple and rapid method has been developed for the determination of ascorbic acid in fruit and pharmaceutical products. The method is based on the measurement of the reaction rate between ammonium molybdate and ascorbic acid in acidic media. The reaction was monitored spectrophotometrically at 800 nm by fixed-time and variable-time methods. The calibration graph was linear in the range of...
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Voltammetric techniques have been considered as important methods among the analytical techniques used for the identification and determination of trace concentrations of many biological molecules such as L-ascorbic acid (AA). L-ascorbic acid is an electro-active molecule, though it is difficult to determine its value directly with a majority of electrodes made of carbon and transition metals, ...
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Voltammetric techniques have been considered as important methods among the analytical techniques used for the identification and determination of trace concentrations of many biological molecules such as L-ascorbic acid (AA). L-ascorbic acid is an electro-active molecule, though it is difficult to determine its value directly with a majority of electrodes made of carbon and transition metals, ...
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A new spectrophotometric method for the determination of minute amounts of cholesterol in tissues is described. This method is a modification of the Yoshimatsu reaction which is basedon the reduction of the yellow aqueoussolution of phospho-6tungstic-12-molybdic acid by a solution of cholesterol in concentrated sulfuric acid. The color of the resulting hydrosol of “molybdenum/tungsten blue” is ...
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We have developed a simple and precise paper chromatographic method for the determination of 4-hydroxy-3-methoxymandelic acid (VMA) in urine. Concentrations of VMA in patients with neuroblastoma were increased in comparison to controls. The linearity was excellent in the concentration range tested. The within-assay coefficient of variation for control and patient urine was less than 2.2%. ...
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ژورنال
عنوان ژورنال: Biochemical Journal
سال: 1935
ISSN: 0306-3283
DOI: 10.1042/bj0292251