The aim of the present study was to investigate the quality characteristics of the aronia cultivar ‘Viking’ as affected by cultivation region. Aronia cultivated in 5 different regions (Danyang, Geochang, Gangjin, Gochang, and Ganghwa) was collected. pH, total acid, soluble solid, redness, total anthocyanin, total polyphenol, tannin, and organic acids were analyzed. Correlation analysis was also performed to determine the relationship between the quality characteristics of aronia and meteorological factors in each cultivation region. All variable assessed differed significantly among samples. pH ranged between 3.86-4.06. The highest pH was recorded in aronia cultivated in Gochang. Aronia grown in Ganghwa had the highest total acid, soluble solid, and total anthocyanin content and the highest redness. Malic acid, tartaric acid, and citric acid were detected in all aronia samples, with malic acid being the predominant organic acid in the aronia cultivars. Correlation analysis revealed pH and soluble solid content to have significant positive correlations with sunshine duration. However, redness showed a significant negative correlation with precipitation. Therefore, it can be confirmed that cultivation region play an important role in determining the quality characteristics of aronia ‘Viking’ from the results of this study.

This study was conducted to investigate the characteristics of Yakju fermented using different 7 commercial yeasts; La parisienne (black), La parisienne (red), Fermivin, RC212, K1-V1116, D47, and EC1118. After completion of fermentation, the total acid content in Yakju ranged from 0.26 to 0.40%; the lowest and highest values corresponded to fermentation using La parisienne (red) and EC1118, respectively. The amino acidity of the different Yakju samples varied significantly in the range of 2.49 to 5.50. The Yakju fermented with K1-V1116, La parisienne (black), La parisienne (red) showed high amino acidity levels of 5.59, 5.55 and 5.34, respectively, but that fermented with Fermivin showed a low level of 2.49. EC1118 seemed to be most suitable for producing the dry type of alcoholic beverage because of the low reducing sugar content (0.19%) and soluble solid (7.2 °Brix). The main organic acids in Yakju were succinic acid, lactic acid, citric acid, malic acid and acetic acid. Further, the succinic acid content in Yakju fermented with La parisienne (black), La parisienne (red) was high (about 1,080 mg/L). The main volatile compounds were acetaldehyde, acetic acid and iso-amyl alcohol, and the acetaldehyde and acetic acid contents of the different Yakju samples varied substantially.

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This study aimed to find an effective preservation method of lotus leaves for the preparation of lotus-leaf Yakju throughout the year. The characteristics of Yakju containing lotus leaves pretreated by blanching, steaming, roasting, and drying were investigated in this study. The chemical properties of Yakju (pH, amino acidity, alcohol content, and volatile acid content) were significantly different for all treatments, except for the total acid content. The polyphenol content ranging from 315.89 to 462.63 ppm (p<0.05) was significantly different depending on pretreatment method L color value for Yakju was not significantly different all treatments, while a value was significantly different in Yakju containing frozen stored leaves after pretreatment. The b value was lowest for the blanching treatment, and was significantly different for all treatments. Among the organic acids present in Yakju, the oxalic, citric, and malic acid contents were significantly different for all treatments. In sensory evaluation, lotus-leaf Yakjus containing fresh leaves and dried leaves were preferred to the others in color and flavor among Yakjus prepared with lotus leaves before cold storage. However, among the Yakjus prepared with lotus leaves after cold storage, that containing blanched leaves was preferred to the others in terms of flavor, taste, and overall acceptability.

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