On the Stability of Isoindole-Type Fluorophores Derived from O-Phthalaldehyde, Primary Amino Compounds and Thiols
作者:
Hiroshi Nakamura,
Atsushi Matsumoto,
Zenzo Tamura,
期刊:
Analytical Letters
(Taylor Available online 1982)
卷期:
Volume 15,
issue 17
页码: 1393-1410
ISSN:0003-2719
年代: 1982
DOI:10.1080/00032718208064437
出版商: Taylor & Francis Group
关键词: o-phthalaldehyde;primary amino compound;thiol;isoindole fluorophore;fluorometry;chemical stability;substituent effect
数据来源: Taylor
摘要:
o-Phthalaldehyde (OPA), a primary amino compound and a thiol react to produce a ternary isoindole-type fluorophore. The effect of the structure of the constituent amino compound on the chemical stability of isoindole fluorophores was investigated. The amino compounds with steric hindrance around the -NH2group such as L-tryptophan and L-Dopa exhibited a marked stabilization effect on the isoindole fluorophores. By using OPA and L-typtophan as reagents, a procedure was established for the fluorometric determination of thiols which permitted the determination of 2 nmol of L-cysteine (CySH). The possible mechanism for the instability of isoindole accelerated by increasing concentration of OPA was also discussed.
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