Affordable Access

Publisher Website

β-mercaptolactate cysteine disulfiduria in two normal sisters. Isolation and characterization of β-mercaptolactate cysteine disulfide

Authors
Journal
Clinica Chimica Acta
0009-8981
Publisher
Elsevier
Publication Date
Volume
43
Issue
3
Identifiers
DOI: 10.1016/0009-8981(73)90480-4

Abstract

Abstract β-Mercaptolactate cysteine disulfide (βMLCD) was detected in two mentally normal sisters, 11 and 13 years old. After isolation by ion-exchange chromatography, high-voltage electrophoresis, and adsorption chromatography on Porapak Q, βMLCD was identified by mass spectrometry of its following methyl ester derivatives: O, N-di-trifluoracetyl, O-trifluracetyl- N-dinitrophenyl, O, N-diacetyl, and O-acetyl- N-dinitrophenyl, with acetyl groups 50% perdeuterated, as well as by gas chromatography-mass spectrometry combination of the desulfuration products alanine (as N-trifluotacetyl-methy; ester) and lactic acid (as methyl ester). The isolated βMLCD contained no sulfoxide nor sulfone and exhibited an UV spectrum closely related to cystine. In urine the concentration range of βMLCD was 345–751 μmole/1 ( n=5) and 54–133 mg/g creatinine; in plasma a trace of βMLCD could be detected only in one case. Oral administration of L-cysteine or L-methionine elevated the concentration of βMLCD in urine and in plasma. A further disulfide accompanying βMLCD in urine was isolated and identified as thioglycolate cysteine disulfide.

There are no comments yet on this publication. Be the first to share your thoughts.