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• W2108251500 abstract "BACKGOUND Currently, the dominant theories on extraction mechanisms of amino acids are mainly deduced from mathematical models or reaction equations, it is thus necessary to obtain direct evidence for the extraction mechanisms by experimental methods. This work aims to reveal the mechanisms of L-lysine (L-Lys) extraction with sec-octylphenoxy acetic acid (CA-12) in sulfonated kerosene by atomic force microscopy (AFM), half-saturated fluorometric experiment and competition experiment. RESULTS The ionic bond based on the electrostatic attraction between the amino group of L-Lys and the carboxyl group of CA-12 was verified visually by high-resolution AFM. Half of the amino groups of L-Lys were labeled by o-phthalaldehyde (OPA) to form half-saturated fluorescent derivatives which were then extracted by means of CA-12 in sulfonated kerosene. The electrostatic attraction between the free amino group of L-Lys and the carboxyl group of CA-12 was illustrated by the relationships between OPA dosage and fluorescence intensities of stock solution and extracted liquid. This electrostatic interaction was also demonstrated by the competition experiment using three other amino acids including L-arginine, L-aspartic acid and L-alanine as competitive reagents. CONCLUSION The chemical force of L-Lys extraction with CA-12 in sulfonated kerosene was comprehensively demonstrated to be the electrostatic interaction between the amino group and the carboxyl group. © 2015 Society of Chemical Industry" @default.
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• W2108251500 date "2015-09-11" @default.
• W2108251500 modified "2023-09-25" @default.
• W2108251500 title "Mechanisms of L-lysine extraction with sec-octylphenoxy acetic acid in sulfonated kerosene" @default.
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• W2108251500 doi "https://doi.org/10.1002/jctb.4799" @default.
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