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Reaction kinetics and pathway of hydrothermal decomposition of aspartic acid
Author(s) -
Faisal Muhammad,
Sato Nobuaki,
Quitain Armando T.,
Daimon Hiroyuki,
Fujie Koichi
Publication year - 2007
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20229
Subject(s) - chemistry , maleic acid , decarboxylation , aspartic acid , decomposition , malic acid , thermal decomposition , succinic acid , activation energy , kinetics , reaction rate constant , chemical kinetics , arrhenius equation , inorganic chemistry , fumaric acid , hydrolysis , order of reaction , reaction rate , organic chemistry , amino acid , catalysis , biochemistry , citric acid , copolymer , polymer , physics , quantum mechanics
The kinetics and pathway of hydrothermal decomposition of aspartic acid were studied using a continuous‐flow tubular reactor. The reaction was carried out in the temperature range of 200–260°C and at a pressure of 20 MPa. Deamination was the primary reaction, indicated by the presence of significant amount of ammonia, fumaric acid, or maleic acid in the products. Other reaction products were pyruvic acid, malic acid, and traces of succinic and lactic acid. Traces of alanine were also detected, showing the possibility of decomposing high‐molecular weight amino acids to obtain simple amino acids such as glycine or alanine. Results on the effect of reaction parameters demonstrated that decomposition of aspartic acid is highly temperature dependent under hydrothermal conditions. For a slight temperature difference of 60°C (from 200 to 260°C), the first‐order reaction rate constants of 0.003 significantly increased to 0.231 s −1 . The activation energy was 144 kJ/mol, as calculated by the Arrhenius equation. No significant effect was exhibited by other reaction parameters such as pH and pressure. The results are useful in controlling the hydrolysis of proteinaceous materials toward high yield of aspartic acid under hydrothermal conditions. © 2007 Wiley Periodicals, Inc. 39: 175–180, 2007