복분자를 이용한 식초의 제조 및 그의 항산화 효과 = Production of Vinegar using Rubus coreanus and Its Antioxidant Activities

다국어 초록 (Multilingual Abstract)

This study developed a high-utility type of vinegar from Rubus coreanus by optimizing its fermentation conditions. In the alcohol fermentation process, the optimal conditions for the maximization of the alcohol contents were an initial sugar concentration of 15 °Brix, a temperature of 30℃ and 4 days. The optimal conditions for the acetic acid fermentation were 9 days of fermentation at 30℃ and 200 rpm, with 6% alcohol and 2% initial acidity. The sucrose, fructose, and glucose contents were 952.90, 491.01, and 386.62 mg%, respectively. The free organic acids were acetic, malic, succinic, malonic, oxalic, and lactic acids. The total free amino acid content was 104.33 μg/mL, with alanine, glutamic acid, γ-amino-N-butyric acid, and o-phospho-ethanolamine as the major amino acids. The K, Na, and Mg contents were 1,686.10, 172.50, and 69.33 ppm, respectively. The total phenolic and anthocyanin contents were 25.19 and 80.71 mg/100 mL, respectively. The DPPH- and ABTS.+ radical scavenging activities were approximately 65 and 94%, respectively. Moreover, the vinegar`s β-carotene bleaching activity and reducing power showed that it had strong anti-oxidant properties. These results show that Rubus coreanus vinegar has anti-oxidant properties and may be used as functional food.

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