Comparing the antioxidant properties and volatile compounds of carrot-orange juice blend processed through varied chemical, pasteurization and ultrasound conditions

Ultrasound technique is one of the green technologies that is being utilized widely for varying food processes. Our aim in this study was to carry out ultrasonication, pasteurization and chemical preservation (Potassium metabisulfite) techniques on a carrot-orange juice blend. Additionally, the effect of these treatments on the storage period of about 21 days was also determined. The study displayed an array of results under the effect of different treatments. Throughout the storage period of 21 days' significant results were presented by the carrot juice blend subjected to the ultrasound technique (25 min) giving the highest values for total phenolic content (25.56 & PLUSMN; 1.29 mg GAE/100 mL), total antioxidant activity (573.48 & PLUSMN; 2.29 mg Trolox /100 mL), DPPH (32.32 & PLUSMN; 1.83 %) and reducing power (45.45 & PLUSMN; 1.92 mg AAE/100 mL) with least deterioration, followed by the blends treated with potassium metabisulfite (KMS) and pasteurization. The physicochemical analysis showed a nonsignificant effect of treatments on pH and total soluble solids (oBrix) of carrot-orange juice blends whereas, the changes in color parameters L*, a* and b* were noted to show changes in treated blends. Similarly, the results for the GC-MS quantification of volatile compounds displayed the highest concentrations in the ultrasonicated blends as compared to other techniques. The peak quantity was obtained for the hexanal (9903.43 & PLUSMN; 7.61 & mu;g. kg-1) followed by 3-Methylbutanal (2638.7 & PLUSMN; 5.44 & mu;g.kg � 1), terpinolene (2337.16 & PLUSMN; 5.28 & mu;g.kg � 1), elemicin (2198.28 & PLUSMN; 5.28 & mu;g.kg � 1), myristicin (1936.62 & PLUSMN; 6.72 & mu;g.kg � 1). The use of sonication can effectively enhance the nutritional qualities of juice, as perceived by consumers.

Automated summary

Ultrasound technique, pasteurization, and chemical preservation were applied to a carrot-orange juice blend to investigate their effects on its storage period and nutritional qualities. Results showed that ultrasound treatment resulted in the highest values for total phenolic content, total antioxidant activity, DPPH, and reducing power with least deterioration during the 21-day storage period. Physicochemical analysis indicated no significant effect on pH and total soluble solids, but changes in color parameters were observed. GC-MS quantification showed higher concentrations of volatile compounds in the ultrasonicated blends, particularly hexanal.