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An inhibitive determination method for heavy metals using tomato crude proteases


Citation

G., Baskaran and Sulaiman, M. H. and Halmi, M. I. E. and Amir Syahir, and Roslan, M. A. H. and Hussain, J. and Shukor, M. Y. and Syed, M. A. (2013) An inhibitive determination method for heavy metals using tomato crude proteases. Asian Journal of Plant Biology, 1 (1). pp. 10-14. ISSN 2289-5868

Abstract / Synopsis

A new inhibitive heavy metals determination method using extract from Lycopersicon esculentum or tomato from has been developed. The enzyme was assayed using the casein-Coomassie-dye-binding method. In the absence of inhibitors, casein was hydrolysed to completion and the Coomassie-dye was unable to stain the protein and the solution became brown. In the presence of metals, the hydrolysis of casein was inhibited and the solution remained blue. The inhibitions shown by lead, chromium and zinc were, 67.9, 53.1 and 53 %, respectively. The IC50 (concentration causing 50% inhibition) values were 1.407, 0.835 and 0.707 mg/l, respectively. The limits of quantitation (LOQ), for zinc, chromium and lead were 0.729, 0.506 and 0.541 mg/l, respectively. The limits of detection (LOD) for zinc, chromium and lead were 0.032, 0.0317 and 0.0317 mg/l, respectively. The IC50 value for zinc was much lower than the IC50 values for papain and Rainbow trout assays. The IC50 value for zinc was lower than the immobilized urease assay. Other toxic heavy metals, such as silver, arsenic, copper, mercury and cadmium, did not inhibit the crude proteolytic enzyme activity. Based on the characteristics, crude protease enzyme from L. esculentum (tomato) can be used to detect heavy metals in various samples in conjunction with the dye-binding assay.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Biotechnology and Biomolecular Sciences
Publisher: Hibiscus Publisher
Keywords: Lycopersicon esculentum; Protease; Inhibitive determination method
Depositing User: Nabilah Mustapa
Date Deposited: 20 May 2010 02:36
Last Modified: 27 Oct 2017 08:12
URI: http://psasir.upm.edu.my/id/eprint/6710
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