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Purification and characterization of a naringinase from a newly isolated strain of Bacillus amyloliquefaciens 11568 suitable for the transformation of flavonoids.
Food Chemistry 2017 January 2
An intracellular naringinase from Bacillus amyloliquefaciens 11568 isolated from soil was purified, identified, and characterized. The sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis of the purified enzyme gave a single protein band corresponding to a molecular mass of 32kDa. The optimum pH and temperature for naringinase and its α-l-rhamnosidase and β-d-glucosidase activities were pH 7.5 and 45°C, respectively. The enzymes were stable below 45°C between pH 3.5 and 8.5. The Km and the Vmax of the isolated naringinase were 0.95mmol/L and 3847.3mmol/(L·min), respectively. The isolated naringinase was capable of hydrolyzing naringin, neohesperidin, and other glycosides. Additionally, a concentration of 4U/mL of the enzyme in citrus juice was sufficient to remove the naringin and alleviate the bitterness of the juice. These results provide an in-depth insight into the structure of the naringinase and the hydrolysis of naringin and other flavonoids.
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