Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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pH, Acidity, Color, Reducing Sugar, Total Sugar, Alcohol and Organoleptic Characteristics of Puffed Rice Powder Added Takju during Fermentation

팽화미분 첨가에 따른 탁주의 양조 중 pH, 산도, 색도, 환원당, 총당, 알코올 그리고 관능 성질 변화

  • Kim, Ji-Young (Department of Food Science & Technology, Seoul National University of Technology) ;
  • Sung, Ki-Wook (Seoul Takju Manufactory Corporation) ;
  • Bae, Hyun-Wung (Department of Mathematics, Korea Military Academy) ;
  • Yi, Young-Hyoun (Department of Food Science & Technology, Seoul National University of Technology)
  • 김지영 (서울산업대학교 식품공학과) ;
  • 성기욱 (서울탁주제조협회) ;
  • 배현웅 (육군사관학교 수학과) ;
  • 이영현 (서울산업대학교 식품공학과)
  • Published : 2007.06.30
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Abstract

The pH, acidity, color, reducing sugar, total sugar, alcohol, and organoletic characteristics of Takju containing puffed rice powder (0, 25, 50 and 75%) were investigated during fermentation for 10 days. After drastic decrease at Day 1, the pH increased gradually until Day 5 and then tended to decrease after Day 6. A lower concentration of puffed rice powder resulted in a greater pH reduction (p<0.05). Acidity increased quickly with days, especially for the 0% after Day 6 (p<0.05). After a sudden rise at Day 1, the Hunter ‘L’ value tended to decrease with days of fermentation. At the same day, the 75% showed the lowest Hunter ‘L’ value, however, it had the highest Hunter ‘a’ value except on Days 0, 3 and 10 (p<0.05). After a rapid reduction in reducing sugar on Day 3, no differences were observed in the samples (p<0.05). The 75% tended to be higher in reducing sugar. Total sugar decreased rapidly at Day 2, and then either remained unchanged or decreased after Day 3. With the exception of Day 4, the 75% had higher amounts of total sugar than the others at the same day (p<0.05). The Highest alcohol contents [13.0-16.4% (v/v)] occurred on Day 6. Higher alcohol concentrations were observed with higher puffed rice powder (p<0.05). In the sensory evaluation, no differences were detected between the 0% and those with puffed rice powder added (p<0.05).

팽화미분 첨가량을 0, 25, 50 및 75%(w/w)로 하여 제조한 탁주의 pH, 산도, 색도, 환원당, 총당, 알코올 함량 그리고 관능 성질 변화를 조사하였다. 발효 1일에는 pH가 급격히 저하된 후 5일 까지 서서히 증가하였다. 하지만 6일 이후부터는 모든 시료의 pH가 감소하는 경향을 보였는데 팽화미분 함량이 낮을수록 빨리 감소되어 0%에서 가장 낮았다(p<0.05). 산도는 발효가 진행될수록 모든 시료에서 빨리 증가 하였고 6일 이후부터는 0%가 급격히 증가하였다(p<0.05). L값은 모든 시료에서 발효 1일에 급격히 상승하였고 발효기간이 경과함에 따라 감소하는 경향을 보였다. 동일한 발효일에는 75%에서 L값이 항상 낮았다. 하지만 적색도는 0, 3과 10일을 제외하면 75%가 항상 높았다(p<0.05). 환원당은 발효 3일까지는 급격한 감소를 보인 후 차이를 나타내지 않았다(p<0.05). 동일한 발효일에는 75%가 높은 경향을 보였다. 총당은 발효 2일에 급격히 감소하였고 동일한 시료에서는 3일 이후부터 차이가 없거나 약간 감소하였다. 발효 4일을 제외한 동일 발효일에는 75%가 다른 시료보다 높거나 같아서 환원당과 유사하였다(p<0.05). 알코올은 발효 2일까지 급격히 증가하였고 6일에 13.0-16.4%(v/v)로 가장 높은 값을 보였다. 팽화미분 첨가량이 증가할수록 알코올 함량도 항상 높았고 발효도 빨리 진행되었다(p<0.05). 관능검사는 팽화미분을 첨가하지 않은 시료와 팽화미분을 25, 50 또는 75% 첨가한 시료간의 유의적인 차이가 없었다.

Keywords

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