Kinetics studies on thermal isomerization of beta-N-oxalyl-L-alpha,beta-diaminopropionic acid by capillary zone electrophoresis

Citation
La. Zhao et al., Kinetics studies on thermal isomerization of beta-N-oxalyl-L-alpha,beta-diaminopropionic acid by capillary zone electrophoresis, PCCP PHYS C, 1(16), 1999, pp. 3771-3773
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
PCCP PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN journal
1463-9076 → ACNP
Volume
1
Issue
16
Year of publication
1999
Pages
3771 - 3773
Database
ISI
SICI code
1463-9076(1999)1:16<3771:KSOTIO>2.0.ZU;2-#
Abstract
The reciprocal thermal isomerization in aqueous solution between neurotoxic nonprotein amino acid beta-N-oxalyl-L-alpha,beta-diaminopropionic acid (be ta-ODAP) in seeds of Lathyrus sativus (LS; grass pea) and its nontoxic isom er alpha-N-oxalyl-l-alpha,beta-diaminopropionic acid (alpha-ODAP) was studi ed using capillary zone electrophoresis (CZE) in the range from pH=2.5 to p H=13 at T=75 degrees C, and a decrease of the equilibrium concentration rat io of alpha-ODAP with the increase of pH of the solution was found. In the range of temperatures 55-95 degrees C, The rate constants have been measure d and thermodynamic parameters such as activation energy (E-a) and the pre- exponential factor (A) have been calculated.