A rapid gas-liquid chromatographic method far determining oxalic acid in biological materials' A number of gas cllromntographic (GC) methods for the analysis of the methyl ester of osalic acid in l~iological mntcrinls have hen reportedl-4. However, clifliculties in sample treatments : cg., isolatio
Rapid and direct gas chromatographic determination of oxalic acid in urine
โ Scribed by Dosch, Werner
- Publisher
- Springer
- Year
- 1979
- Tongue
- English
- Weight
- 589 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0300-5623
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โฆ Synopsis
The known methods of oxalic acid determination are not suitable for reliable, rapid and economical routine analysis. A rapid gas chromatographic method has been developed which dispenses with separation operations and measures oxalic acid as a diethylester by means of back-flushing, and using malonic acid as an internal standard. One determination can be conducted within 6 to 8 min. and preparation of the specimen takes about the same amount of time. If the gas chromatographic conditions are changed and more time is permitted for analysis, numerous other extractable acidic metabolites can also be determined.
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An analytical procedure for the estimation of urinary oxalate is described which satisfies the requirements of specificity, recovery, and negligibIe generation of oxalate from progenitors. The procedure involves precipitation of oxalate from urine as the calcium salt and subsequent diesterification
A method for gas chromatographic detection of codeine in serum is described. An application to a clinical drug evaluation study is given. A method for simultaneous detection of free and total codeine and its metabolites, norcodeine and morphine, in urine is also presented. SE OF GAS-LIQUID chromatog