pH, Acidity, Color, Amino Acids, Reducing Sugars, Total Sugars, and Alcohol in Puffed Millet Powder Containing Millet Takju during Fermentation

팽화차조 첨가에 따른 조 막걸리의 양조 중 pH, 산도, 색도, 아미노산, 환원당, 총당 및 알코올 함량 변화

  • Kim, Ji-Young (Food Science & Technology Department, Seoul National University of Science and Technology) ;
  • Yi, Young-Hyoun (Food Science & Technology Department, Seoul National University of Science and Technology)
  • 김지영 (서울과학기술대학교 식품공학과) ;
  • 이영현 (서울과학기술대학교 식품공학과)
  • Received : 2010.07.19
  • Accepted : 2010.09.02
  • Published : 2010.12.31

Abstract

The pH, acidity, color, amino acid, reducing sugar, total sugar, and alcohol contents of puffed millet powder supplemented with different concentrations of millet takju were investigated during 10 days of fermentation. The pH ranged from 4.06 to 4.58 at day 1 but decreased drastically to 3.55-3.64 at day 2. With the exception of day 1, a higher pH was observed with a higher concentration of puffed millet powder (p<0.05). Acidity tended to increase quickly over time, especially for the 0% sample after day 4 (p<0.05). The sudden increase of acidity at day 2 agreed with the pH decrease. A lower concentration of puffed millet powder resulted in a greater Hunter "L" value (p<0.05) and tended to show lower Hunter "a" and higher Hunter "b" values on the same day. Amino acids increased over time, and a higher concentration of puffed millet powder resulted in lower amino acid content on the same day after day 3 (p<0.05). After a rapid reduction in reducing sugar on day 2 (p<0.05), minimal differences were observed in the samples after day 4. The 75% puffed millet powder sample showed the highest reducing sugar content, except on days 8 and 9 (p<0.05). Total sugars decreased rapidly by day 3, and then either remained unchanged or decreased after day 4. Higher alcohol concentrations were observed with higher concentrations of puffed millet powder, except on day 1 (p<0.05).

팽화차조 첨가량을 0, 25, 50 및 75%(w/w)로 하여 제조한 막걸리의 pH, 산도, 색도, 아미노산, 환원당, 총당 그리고 알코올 함량 변화를 조사하였다. 발효 1일 막걸리의 pH는 4.06-4.58의 범위였으나 2일에는 3.55-3.64로 급격히 감소하였다. 발효 1일을 제외한 동일한 발효일에는 팽화차조 75%가 항상 높았으며 3일 이후부터는 팽화차조 첨가량이 증가할수록 pH도 높거나 같았다(p<0.05). 산도는 2일에는 증가되어 pH가 급격히 저하된 시점과 일치하였다. 발효기간이 경과될수록 증가하는 경향을 보였다. 발효4일 이후부터는 0%가 급격히 증가되어 발효 10일 1.67%로 가장 높았다(p<0.05). 색도에서 L값은 발효1일 59.13-66.03에서 2일 64.10-71.06으로 상승하였다. 동일한 발효일에는 팽화차조 첨가량이 증가할수록 L값이 유의적으로 항상 낮았다(p<0.05). 팽화차조 함량이 높을수록 적색도는 높은 경향을 나타내 L값과는 반대였고 황색도는 낮아 L값과는 유사한 경향을 보였다. 아미노산 함량은 발효기간이 진행될수록 유의적으로 증가하였다(p<0.05). 발효 3일 이후 동일한 발효일에는 팽화차조 첨가량이 증가할수록 아미노산함량이 낮게 나타났다(p<0.05). 환원당은 발효 2일 급격히 감소하였으며(p<0.05) 4일 이후부터는 큰 차이를 보이지 않았다. 발효 8일과 9일을 제외한 동일한 발효일에는 팽화차조 75%가 가장 높았다(p<0.05). 총당은 발효 3일까지 급격히 감소하였고(p<0.05) 4일 이후부터는 큰 변화를 보이지 않아 환원당 함량과 비슷한 경향을 보여주었다. 알코올 함량은 발효 1일을 제외한 모든 발효일에서 팽화차조 첨가량이 증가할수록 높게 나타났고(p<0.05) 발효도 빠르게 진행되었다.

Keywords

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