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KMID : 0380620150470010051
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Korean Journal of Food Science and Technology
2015 Volume.47 No. 1 p.51 ~ p.55
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Aromatic Ingredients and Distinct Flavors of the Koguma-Soju Produced from Korean Sweet Potato Varieties Yeonmi, Jeungmi, Shincheonmi, and Shinyeulmi
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Kim Myoung-Hui
Takamine Kazunori
Yoshitake Kazuya
Lee Hyeong-Un
Kim Won-Sin
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Abstract
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Four varieties of the Korean sweet potato, Yeonmi, Jeungmi, Shincheonmi, and Shinyeulmi, were chosen to prepare the distilled koguma-soju (sweet potato-soju). The relationship between the flavor of the koguma-soju and the content of monoterpene alcohols (MTAs) was studied. The MTAs investigated here were linalool, nerol, geraniol, citronellol, and α- terpineol. The ranges of MTA concentrations in the koguma-soju made from the four sweet potato varieties were 14.0-16.6 μg/ L for nerol, 24.8-34.7 μg/L for linalool, 32.8-38.5 μg/L for geraniol, 37.8-54.2 μg/L for citronellol, and 76.6-94.7 μg/L for α- terpineol. Geraniol, nerol, and linalool were found in lower concentrations, while α-terpineol was present in a higher concentration compared to their average content in the imo-shochu, a distilled Japanese sweet potato-soju. The concentrations of citronellol in the koguma-soju and imo-shochu were similar. The flavor evaluation tests revealed that the koguma-soju produced from the Yeonmi variety had a leafy vegetable or a grass-like, sharp flavor, whereas the Jeungmi-soju was characterized by a fruity or a sulfur-like sharp taste. Floral, vanilla-like, and mild flavors were predominant in the Shincheonmi-soju, while the Shinyeulmi-soju had either a fruity, citrus-like flavor or a rubber-like, rough taste. This study demonstrates that koguma-soju made from different sweet potato varieties have unique characteristic flavors.
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KEYWORD
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koguma-soju, imo-shochu, mono-terpene alcohol (MTA), fermentation, sweet potato-soju
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