U.S. flag

An official website of the United States government


Main content area

A magnetic tri-enzyme nanobiocatalyst for fruit juice clarification

Sojitra, Uttam V., Nadar, Shamraja S., Rathod, Virendra K.
Food chemistry 2016 v.213 pp. 296-305
Fourier transform infrared spectroscopy, X-ray diffraction, alpha-amylase, apples, cell walls, cellulose, clarification (processing), crosslinking, endo-1,4-beta-glucanase, glutaraldehyde, grapes, half life, immobilized enzymes, juice quality, nanoparticles, pH, pectins, pineapple juice, polygalacturonase, scanning electron microscopy, starch, turbidity
The major complications in fruit juice quality improvement are the presence of polysaccharides components in the form of disrupted fruit cell wall and cell materials. Hence, breakdown of cellulose along with pectin and starch is important for the juice processing. In this context, magnetic tri-enzyme nanobiocatalyst was prepared by simultaneously co-immobilizing three enzymes; α-amylase, pectinase and cellulase onto amino-functionalized magnetic nanoparticle by 60mM glutaraldehyde concentration with 10h cross-linking time for one pot juice clarification. The prepared nanobiocatalyst was characterized by FT-IR, SEM and XRD. The thermal (50–70°C) and pH (3–6) stability studies indicated more than two folds increment in half-life and enhanced tolerance to lower pH. The immobilized enzymes retained up to 75% of residual activity even after eight consecutive cycles of reuse. Finally, the clarification of apple, grapes and pineapple juices using magnetic tri-enzyme showed 41%, 46% and 53% respective reduction in turbidity till 150min treatment.