61277-72-3Relevant academic research and scientific papers
Kinetics studies on thermal isomerization of β-N-oxalyl-L-α,β- diaminopropionic acid by capillary zone electrophoresis
Zhao, Liang,Li, Zhixiao,Li, Guanbin,Chen, Xingguo,Hu, Zhide
, p. 3771 - 3773 (1999)
The reciprocal thermal isomerization in aqueous solution between neurotoxic nonprotein amino acid β-N-oxalyl-L-α,β-diaminopropionic acid (β-ODAP) in seeds of Lathyrus sativus (LS; grass pea) and its nontoxic isomer α-N-oxalyl-L-α,β-diaminopropionic acid (α-ODAP) was studied using capillary zone electrophoresis (CZE) in the range from pH = 2.5 to pH = 13 at T = 75 °C, and a decrease of the equilibrium concentration ratio of α-ODAP with the increase of pH of the solution was found. In the range of temperatures 55-95 °C. The rate constants have been measured and thermodynamic parameters such as activation energy (E(a)) and the pre- exponential factor (A) have been calculated.
Thermal isomerization of the neurotoxin β-N-oxalyl-L-α,β-diam inopropion ic acid
Belay, Abebaw,Moges, Ghirma,Solomon, Theodros,Johansson, Gillis
, p. 219 - 223 (1997)
The rate constants and reaction order for the conversion of the neurotoxin β-ODAP to α-ODAP have been determined, after off-line thermal treatment, using the recently developed flow injection system for the neurotoxin based on a glutamate oxidase reactor. The effects of the initial concentration of the toxin, temperature and pH on the kinetics and the equilibrium of the endothermic process were examined. The conversion followed a zero order rate law. The reaction rate at pH 7 increased by about two-fold for every 10°temperature rise. The rate at pH 2 was about 60% higher than at pH 7.
THERMAL ISOMERIZATION OF N-OXALYL DERIVATIVES OF DIAMINO ACIDS
Abegaz, Berhanu M.,Nunn, Peter B.,Bruyn, Andre De,Lambein, Fernand
, p. 1121 - 1124 (2007/10/02)
The neurotoxic constituent of the legmure Lathyrus sativus, β-N-oxalyl-α,β-diaminopropionic acid, was thermally isomerized to an equilibrium mixture (60/40) containing the non-toxic α-N-oxalyl-α,β-diaminopropionic acid.The same equilibrium mixture was established by starting with the α isomer but required longer time. α- and γ-N-Oxalyl-α,γ-diaminobutyric acids also underwent thermally induced isomerization with α-γ, or γ-α migration of the oxalylgroup. δ-N-oxalylornithine and ε-N-oxalyllysine did not isomerize under these conditions.The observation that the higher homologes do not undergo isomerization suggest the intramolecular nature of the reaction. Key Word Index: Lathyrus sativus; α- and β-N-oxalyl-α,β-diaminopropionic acid; α-, γ-N-oxalyl-α,γ-diaminobutyric acids; δ-N-oxalylornithine; ε-N-oxalyllysine; neurotoxins; thermal isomerization.
