Antioxidant activity of ecoenzyme derived from Siamese orange peel (Citrus nobilis) at different fermentation duration
Abstract
Background: Ecoenzyme is an organic fermentation product derived from fruit peel waste, offering zero-waste system benefits along with antibacterial, insecticidal, and cleaning properties. Kintamani, a major producer of Siamese oranges (Citrus nobilis) in Bali, generates significant orange peel waste suitable for ecoenzyme production. However, the antioxidant potential of ecoenzymes remains poorly studied.
Objective: This study aimed to evaluate the antioxidant activity of ecoenzymes produced from Kintamani Siamese orange peel waste, enhancing their beneficial value.
Methods: This experimental study assessed and compared the antioxidant activity of ecoenzymes fermented for 10 days, 1 month, and 3 months. Antioxidant activity was measured using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, with results expressed as IC50 values.
Results: Antioxidant activity, classified according to Blois criteria, showed the highest activity after three months of fermentation. The mean IC50 values were 53,612 ppm for 10-day fermentation; 18,753 ppm for 1-month fermentation; and 6,727 ppm for 3-month fermentation.
Conclusion: Ecoenzymes derived from Kintamani Siamese orange peel waste exhibited very weak antioxidant activity across all fermentation durations. A 3-month fermentation period is recommended to achieve the highest antioxidant activity compared to shorter durations.
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