In this study, effects of blueberry cultivars and pectinase treatment on the extraction yield and physicochemical properties of blueberry juice were investigated. Type and reaction conditions of pectinase were also investigated in order to increase th...
In this study, effects of blueberry cultivars and pectinase treatment on the extraction yield and physicochemical properties of blueberry juice were investigated. Type and reaction conditions of pectinase were also investigated in order to increase the extraction yield of the juice.
Among the cultivars of blueberry such as Nelson, Duke, Reka and Jersey used in this study, Reka showed the highest yield in the juice prepared without the enzyme treatment. Therefore cultivar Reka was used for further study with pectinase treatment. When Reka blueberry juice was prepared with treatment of two different commercial pectinase enzymes, Rapidase C80MAX showed a higher juice yield than Rapidase prees L. The optimum conditions of the Rapidase C80MAX enzyme treatment were 0.01% of concentration (w/w), and at 50℃ for 120 min . The enzyme treatment under the optimal conditions resulted in a significant increase in the juice from 70.46% to 87.55%. Soluble soild content also increased from 8.8 °Brix to 9.2 °Brix in the enzyme treated juice.
Total acid content rather slightly decreased from 0.97% in the juice prepared without the enzyme treatment to 0.71% in the enzyme treated juice. No significant differences were observed in the Hue and intensity of the juices regardless of the pectinase treatment. However, the enzyme treatment resulted in the increase of the total phenol content (0.30% to 0.45%) and DPPH radical scavenging in the juice compared to the juice prepared without enzyme treatment.