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Effect of varying the amount of water added on the characteristics of mash fermented using modified Nuruk for distilled-Soju production

가수량 변화가 개량누룩으로 발효한 증류식 소주용 술덧의 특성에 미치는 영향

  • Choi, Han-Seok (Fermented Food Science Division, National Academy of Agricultural Science, RDA) ;
  • Kim, Eu-Gene (Fermented Food Science Division, National Academy of Agricultural Science, RDA) ;
  • Kang, Ji-Eun (Fermented Food Science Division, National Academy of Agricultural Science, RDA) ;
  • Choi, Ji-Ho (Fermented Food Science Division, National Academy of Agricultural Science, RDA) ;
  • Yeo, Soo-Hwan (Fermented Food Science Division, National Academy of Agricultural Science, RDA) ;
  • Jeong, Seok-Tae (Fermented Food Science Division, National Academy of Agricultural Science, RDA)
  • 최한석 (농촌진흥청 국립농업과학원 발효식품과) ;
  • 김유진 (농촌진흥청 국립농업과학원 발효식품과) ;
  • 강지은 (농촌진흥청 국립농업과학원 발효식품과) ;
  • 최지호 (농촌진흥청 국립농업과학원 발효식품과) ;
  • 여수환 (농촌진흥청 국립농업과학원 발효식품과) ;
  • 정석태 (농촌진흥청 국립농업과학원 발효식품과)
  • Received : 2014.08.29
  • Accepted : 2014.10.28
  • Published : 2014.12.30

Abstract

This study was conducted to investigate the effects of varying the amount of water added on the characteristics of mash fermented using modified Nuruk for distilled-Soju production. As the amount of water added to the mash increased from 120 to 300%, the pH dropped from 4.6 to 4.2, resulting in reductions in the acidity from 6.0 to 5.2, in the amino acid level from 6.0 to 4.2, and in the soluble-solid content from 18.4 to $7.4^{\circ}Brix$. The alcohol concentration of the mash was highest at 17.6%, when 150% water was added, while the alcohol yield showed water-content-dependent increases of 59.7, 74.5, 80.8, 82.8, 89.4, and 90.6% with 120, 150, 180, 200, 250, and 300% water added, respectively. The values of the organic-acid content in the mash were 207.85, 222.38, 222.06, 204.56, 194.34, and 204.34 mg/100 mL, showing the highest values when 150 and 180% water was added. The total amino-acid content showed water-content-dependent decreases at 474.60, 317.32, 241.89, 244.51, 189.00, and 208.12 mg/100 mL, with arginine, alanine, glutamic acid, glycine, isoleucine, leucine, lysine, phenylalanine, proline, serine, tyrosine, and valine as the major components. The concentrations of isobutanol, isoamyl alcohol, 1-propanol, and 2-phenylalcohol were 154.88~182.62, 320.59~394.47, 91.50~170.91, and 108.93~144.26 ppm, respectively, while ethyl acetate, acetaldehyde, furfural, and butyric acid were also detected.

가수량이 120%에서 300%로 증가하면서 pH는 4.6에서 4.2로 산도는 6.0에서 5.2로, 아미노산도는 6.0에서 2.5로, 가용성 고형분 함량은 18.4에서 $7.4^{\circ}Brix$로 낮아졌다. 술덧의 알코올 농도는 150%에서 17.6%로 가장 높았고 알코올 생산수율은 각각 59.7, 74.5, 80.8, 82.8, 89.4, 90.6%로 가수량에 의존적으로 증가하였다. 술덧의 유기산 총량은 각각 207.85, 222.38, 222.06, 204.56, 194.34, 204.34 mg/100 mL로 150%와 180%에서 높게 나타났다. 유리아미노산 총량은 각각 474.60, 317.32, 241.89, 244.51, 189.00, 208.12 mg/100 mL로 가수량에 의존적으로 감소하였고 arginine, alanine, glutamic acid, glycine, isoleucine, leucine, lysine, phenylalanine, proline, serine, tyrosine, valine이 주요 성분이었다. Iso-butanol은 154.88~182.62 ppm, iso-amylalcohol은 320.59~394.47 ppm, 1-propanol은 91.50~170.91 ppm, 2-phenylalcohol은 108.93~144.26 ppm농도로 분포하고 있고 ethyl acetate, acetaldehyde, furfural, butyric acid가 검출되었다.

Keywords

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