KFU. Card publication. Coulometric determination of sulfur-containing amino acids using halogens as oxidizing titrants

KAZAN
FEDERAL UNIVERSITY

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COULOMETRIC DETERMINATION OF SULFUR-CONTAINING AMINO ACIDS USING HALOGENS AS OXIDIZING TITRANTS

Form of presentation

Articles in Russian journals and collections

Year of publication

2007

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Authors, employees of KFU

Budnikov German Konstantinovich, author

Ziyatdinova Guzel Kamilevna, author

Authors, students KFU

Grigoreva Lidiya Vladimirovna, author

Bibliographic description in the original language

Ziyatdinova, G.K. Coulometric determination of sulfur-containing amino acids using halogens as oxidizing titrants / G.K. Ziyatdinova, L.V. Grigor'eva, G.K. Budnikov // J. Anal. Chem. - 2007. - V. 62. - No. 12.- P. 1176-1179.

Annotation

It is found that cysteine and methionine quantitatively react with electrogenerated halogens under the conditions of galvanostatic coulometry. Cysteine reacts with all titrants, and methionine reacts only with chlorine and bromine. The stoichiometric coefficients of reactions between cysteine and halogens are 1 : 3, 1 : 3, and 1 : 1 for chlorine, bromine, and iodine, respectively. These coefficients for methionine reactions with chlorine and bromine are 1 : 2 and 1 : 1, respectively. It is shown that cysteine can be selectively determined in its mixtures with methionine by coulometric titration with electrogenerated iodine. It is found that twofold amounts of methionine do not interfere with the determination of cysteine. A procedure is developed for the direct coulometric determination of methionine in tablets with a relative standard deviation of 3?5%.

Keywords

Galvanostatic coulometry, electrogenerated halogens, methionine, cysteine, pharmaceutical analysis

The name of the journal

J ANALCHEM+

URL

http://link.springer.com/article/10.1134%2FS1061934807120143

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=66650&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Budnikov German Konstantinovich	ru_RU
dc.contributor.author	Ziyatdinova Guzel Kamilevna	ru_RU
dc.contributor.author	Grigoreva Lidiya Vladimirovna	ru_RU
dc.date.accessioned	2007-01-01T00:00:00Z	ru_RU
dc.date.available	2007-01-01T00:00:00Z	ru_RU
dc.date.issued	2007	ru_RU
dc.identifier.citation	Ziyatdinova, G.K. Coulometric determination of sulfur-containing amino acids using halogens as oxidizing titrants / G.K. Ziyatdinova, L.V. Grigor'eva, G.K. Budnikov // J. Anal. Chem. - 2007. - V. 62. - No. 12.- P. 1176-1179.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=66650&p_lang=2	ru_RU
dc.description.abstract	J ANALCHEM+	ru_RU
dc.description.abstract	It is found that cysteine and methionine quantitatively react with electrogenerated halogens under the conditions of galvanostatic coulometry. Cysteine reacts with all titrants, and methionine reacts only with chlorine and bromine. The stoichiometric coefficients of reactions between cysteine and halogens are 1 : 3, 1 : 3, and 1 : 1 for chlorine, bromine, and iodine, respectively. These coefficients for methionine reactions with chlorine and bromine are 1 : 2 and 1 : 1, respectively. It is shown that cysteine can be selectively determined in its mixtures with methionine by coulometric titration with electrogenerated iodine. It is found that twofold amounts of methionine do not interfere with the determination of cysteine. A procedure is developed for the direct coulometric determination of methionine in tablets with a relative standard deviation of 3?5%.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Galvanostatic coulometry	ru_RU
dc.subject	electrogenerated halogens	ru_RU
dc.subject	methionine	ru_RU
dc.subject	cysteine	ru_RU
dc.subject	pharmaceutical analysis	ru_RU
dc.title	Coulometric determination of sulfur-containing amino acids using halogens as oxidizing titrants	ru_RU
dc.type	Articles in Russian journals and collections	ru_RU