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고문헌 『산가요록』에 수록된 대추식초의 공정 개선과 품질 특성

Improvement in the manufacturing process and quality of jujube vinegar in the ancient literature 『Sangayorok』

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초록

Jujube vinegar is produced using a method described in the ancient literature titled “Sangayorok”. In this vinegar production method, alcohol and acetic acid fermentation occur at the same time. This study was conducted to reproduce the traditional jujube vinegar and improve its quality. The manufacturing proess was divided into two stages of fermentation. Jujube wine was prepared using the base liquor (Mit-sool), and jujube vinegar was prepared by seed vinegar. Moreover, the optimum conditions were determined by analyzing the quality of the fermented jujube vinegar at different temperatures (20, 30, and 35℃) and initial pH conditions (pH 3, 4, and 5). We evaluated the pH, acidity, organic acid content, and antioxidant activity of the fermented jujube vinegar, and its taste was analyzed using an electronic tongue. On the 14th day of fermentation under pH 4 and at 20℃, the pH level dropped to 3.4, and the acidity was 10.4%. The total organic acid content was 6,568 mg /100 mL, of which acetic acid content was as high as 83% (5,475 mg/100 mL). Umami and sourness of the vinegar increased as the fermentation progressed. Analysis of antioxidant activity of the vinegar fermented at pH 4 and 20℃ revealed that the ABTS radical scavenging activity of the jujube vinegar was 90.9%, and the total polyphenol content was 1,131.3 mg (GAE)/100 mL. These findings can form a basis for selecting optimal fermentation conditions and developing manufacturing technologies through modernized process improvements for commercialization of traditional jujube vinegar.

Abstract

Jujube vinegar is produced using a method described in the ancient literature titled “Sangayorok”. In this vinegar production method, alcohol and acetic acid fermentation occur at the same time. This study was conducted to reproduce the traditional jujube vinegar and improve its quality. The manufacturing proess was divided into two stages of fermentation. Jujube wine was prepared using the base liquor (Mit-sool), and jujube vinegar was prepared by seed vinegar. Moreover, the optimum conditions were determined by analyzing the quality of the fermented jujube vinegar at different temperatures (20, 30, and 35℃) and initial pH conditions (pH 3, 4, and 5). We evaluated the pH, acidity, organic acid content, and antioxidant activity of the fermented jujube vinegar, and its taste was analyzed using an electronic tongue. On the 14th day of fermentation under pH 4 and at 20℃, the pH level dropped to 3.4, and the acidity was 10.4%. The total organic acid content was 6,568 mg /100 mL, of which acetic acid content was as high as 83% (5,475 mg/100 mL). Umami and sourness of the vinegar increased as the fermentation progressed. Analysis of antioxidant activity of the vinegar fermented at pH 4 and 20℃ revealed that the ABTS radical scavenging activity of the jujube vinegar was 90.9%, and the total polyphenol content was 1,131.3 mg (GAE)/100 mL. These findings can form a basis for selecting optimal fermentation conditions and developing manufacturing technologies through modernized process improvements for commercialization of traditional jujube vinegar.

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