A method for the synthesis of deuterium-labelled tryptophan and its enzymatic conversion to indole-3-pyruvic acid ( ( Hs) IPyA) using amino acid oxidase is described. an internal standard for the quantitation of IPyA by mass spectrometry in plant extracts and for estimating the breakdown of IPyA to
Synthesis of [5-3H] hemimellitic acid
โ Scribed by Michael Shimoni; Jacques Azran; Ouri Buchman
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- French
- Weight
- 176 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
โฆ Synopsis
1.2.3-Benzenetricarboxylic acid (hemimellitic acid) tritiated in position 5 has been labelled at a specific activity of 16.2 Ci/mmol, starting from 3-bromo naphthalic anhydride. Attempts at direct bromination of the acid followed by tritiodebromination, or of general labelling by hydrogen-tritium exchange gave poor results.
๐ SIMILAR VOLUMES
## Abstract Labeled 1โtryptophan is converted to indoleโ3โacetamide and then to indoleโ3โacetic acid by enzymes from __Pseudomonas savastanoi__. Labeled indoleโ3โacetic acid can be converted to indoleโ3โacetylโ1โ__0__โฮฒโDโglucose and to indoleโ3โacetylโ__myo__โinositol by enzymes from kernels of __
The title compound (ABA-Tyr) was prepared by direct radiochemical synthesis from tritiated t&.-butoxycarbonyl-L-tyrosine and diazotised arsanilic acid followed by acidolytic deprotection and isolation by preparative high pressure liquid chromatography. The product had a specific activity of 9 Ci mmo
Cytidine-PH was synthesized, by the incorporation of I . I-diethoxy 2-~yanoethane-2-~H (~yanoacetal-2-~H), using an adaption of the procedure described by Codington (1) for the synthesis of cytidine-2-14C. The final step in this procedure was the coupling of the mercuric compound of the base with th