An enzymatic flow-injection procedure with chemiluminescence detection for on-site determination of L-alanine in synthesis process

Journal of the Brazilian Chemical Society

Eduardo P. Borges²  Boaventura F. Reis¹ 

[1] ,Universidade Federal de São Carlos Departamento de Química São Carlos SP ,Brazil

关键词: flow analysis;    automation;    chemiluminescence;    amino acid;    L-alanine;   

DOI  :  10.1590/S0103-50532005000700021

来源: SciELO

【 摘 要 】

In this work an automatic flow procedure for L-alanine determination in the synthesis medium without a prior sample treatment is described. The method was based on oxidation of L-alanine by L-amino acid oxidize followed by the reaction of the H2O2 with luminol and chemiluminescence detection. In order to overcome the severe alkaline condition of the synthesis medium, a zone sampling strategy was employed for automatic sample dilution and pH adjustment. The procedure allows L-alanine determination in the range of 0.5 to 25.0 mmol L-1, a limit of detection of 0.08 mmol L-1 and a variation coefficient lower than 4% (n = 10). Other advantageous feature such as a sampling throughput of 44 determination per hour and low reagent consumption, 0.2 mg luminol and 16.4 mg hexacinoferrate(III) per determination, respectively, were also achieved.

【 授权许可】

CC BY   
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