The use ofN-succinyl derivatives in the study of amino acids and peptides by mass spectrometry
作者:D. C. Dejongh、G. Faus、M. S. B. Nayar、G. Boileau、L. Brakier-Gingras
DOI:10.1002/bms.1200030409
日期:1976.8
The terminal amino group of aminoacids and peptides is blocked as the N-succinyl derivative by reaction with succinic anhydride. The product is then converted to the N,O-permethyl derivative in order to increase its volatility for use in massspectrometry. The permethylated N-succinyl derivative retains the advantages of the permethylated N-acetyl derivative in regard to ease of preparation on a small
Derivatives of hippuryl-L-phenylalanine having the following general formula: ##STR1## wherein X represents OH or CH.sub.3 O useful as substrates for measuring the actively of carboxy peptidose A.
TiF<sub>4</sub>-catalyzed direct amidation of carboxylic acids and amino acids with amines
作者:Abdulkhaliq A. Alawaed、P. Veeraraghavan Ramachandran
DOI:10.1039/d3ob01943h
日期:——
Unlike other metal fluorides, catalytic titanium tetrafluoride enhances the direct amidation of aromatic and aliphatic carboxylicacids and N-protected amino acids in refluxing toluene. While aromatic acids were converted to amides with 10 mol% of the catalyst within 24 h, aliphatic acids underwent a faster reaction (12 h), with lower catalyst loading (5 mol%). This protocol is equally efficient with
Derivatives of hippuryl-L-phenylalanine and their use in determining the activity of carboxypeptidase A
申请人:FUJIREBIO KABUSHIKI KAISHA
also trading as FUJIREBIO INC.
公开号:EP0083857A1
公开(公告)日:1983-07-20
Derivatives of hippuryl-L-phenylalanine having the following general formula:
wherein X reprsents OH or CH3O are novel substances and are used in determining the activity of carboxypeptidase-A in a liquid medium containing it by addition to the liquid medium prior to or together with hippuricase, 4-aminoantipyrine and an oxidising agent. The concentration of the quinonimine dye which is formed as a result of adding the oxidising agent is measured colounmetrically to give a value from which the activity of carboxypeptidase A may be determined.
具有以下通式的马尿酰-L-苯丙氨酸衍生物是一种新型物质:
其中 X 代表 OH 或 CH3O,是一种新型物质,用于测定羧肽酶-A 在含有它的液体培养基中的活性,方法是在液体培养基中加入马尿酶、4-氨基安替比林和氧化剂之前或一起加入。加入氧化剂后形成的醌亚胺染料的浓度通过色度测量得出一个值,据此可确定羧肽酶 A 的活性。