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Enzymes loaded chitosan/coconut fibre/zinc oxide nanoparticles strip for polyamine determination.
Food Chemistry 2018 January 16
Most often, the immobilized enzyme based quantification is an attractive alternative to other chromatographic, electrochemical and mass spectrometry based methods due to its specificity and simplicity. In the present study, polyamine oxidase specific for spermine and spermidine and diamine oxidase specific for putrescine, were co-immobilized onto a novel chitosan/coconut fibre/zinc oxide nanoparticles (CS/CF/nZnO) hybrid support to yield a polyamine sensing strip. The strip worked optimally at pH 7.0, temperature 25°C and 6min of incubation time. Pretty good values for kinetic constants Km(app) (6.60mM), Vmax (17.69μmol/min mg protein) and kcat(app) (1987.64s(-1)) as well as for thermal (<50 % activity retained at 40°C), storage (half life-40days) and operational stabilities (<90 % activity retained after 20 reuses) were obtained. The strip was employed for polyamine determination in some of the locally grown fruit and vegetables and the results were found to be comparable, reliable and reproducible.
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