Abstract
Purpose: This study evaluates the antioxidant activities of natural pigment extracted from Jeju red beet under different extraction conditions. Methods: Betacyanin and total phenolic contents of red beet pigment extracted with varying concentrations of beet powder (2.5, 3.75, 5.0%), extraction temperature (30, 40, 50℃), and extraction time (6, 9, 12 hr) were analyzed. Additionally, in vitro antioxidant activities were measured, including DPPH free radical scavenging activity, ABTS<sup>+</sup> radical scavenging activity, hydrogen peroxide scavenging activity, and the reducing power of the extracted pigment. Results: After extraction, the red beet pigment contained 0.51-4.12 mg/g betacyanin and 29.87-32.82 mg GAE/g total phenolics. The highest betacyanin content was obtained when extracted with the beet powder concentration of 2.5% to water at 30℃ for 6 hr. The DPPH and ABTS<sup>+</sup> radical scavenging activities of the extract revealed proportionally higher antioxidant activities with higher total phenolic contents. Conclusion: These results indicate that red beet extract can be used in the food industry as a natural food colorant having antioxidative activity.
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