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Studies on the tritium labelling of some local anaesthetics and amino acids by the microwave discharge modification of the Wilzbach technique

โœ Scribed by T. Gosztonyi; N. Walde


Publisher
John Wiley and Sons
Year
1966
Tongue
French
Weight
606 KB
Volume
2
Category
Article
ISSN
0022-2135

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โœฆ Synopsis


Some local anaesthetics and amino acids were labelled with tritium by the microware discharge modification of the Wilzbach technique.

The jollowing substances were investigated: local anaesthetics: carbocaine, citanest, I-cocaine, tetracaine and xylocaine; amino acids: glycine, DL-u-alanine, DL-Leucine, DL-phenylalanine and DL-tryptophane.

The range of microwave energy used was 4,000 to 270,000 Wsec. The range of speciJic activities obtained was from 0.2 to 29.4 mCl m M ; and .for the most used substance, DL-leucine, from 0.4 to 27.2 mClmM.

The efects of some reaction parameters on the labelling were inoestigated. Results obtained are discussed.


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Tritium labelling of amino-acids and pep
โœ J. H. Parmentier ๐Ÿ“‚ Article ๐Ÿ“… 1965 ๐Ÿ› John Wiley and Sons ๐ŸŒ French โš– 369 KB

Optically pure L-valine was labelled with tritium by the Wilzbach method. Only 4 of the activity of the radiochemically pure valine was found in D-valine. This figure was determined by reverse isotope dilution. The suitability of this method for valine was tested, wich good results, with DL-valine

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Optically pure amino-acids were labelled with tritium by the Wilzbach method. The percentage of radioactivity found in the opposite enantiomer was determined by reverse dilution analysis. After tritiation of L-phenylalanine, D-phenylalanine, L-tyrosine, L-proline, D-proline, L-glutamic acid and L-al