Effect of Slander Glasswort Extract Yogurt on Quality during Storage

함초 추출물 첨가가 요구르트 저장 중의 품질 특성에 미치는 영향

  • Cho, Young-Sim (Department of Food and Nutrition, Sookmyung Women's University) ;
  • Kim, Soon-Im (Nano Bio-resources Center, Sookmyung Women's University) ;
  • Han, Young-Sil (Department of Food and Nutrition, Sookmyung Women's University)
  • 조영심 (숙명여자대학교 식품영양학과) ;
  • 김순임 (숙명여자대학교 나노 바이오 소재센터) ;
  • 한영실 (숙명여자대학교 식품영양학과)
  • Published : 2008.04.30

Abstract

This study was performed in an effort to create a functional and stable yogurt product containing slander glasswort extract. The extract was added to milk at concentrations of 0.25, 0.5, and 1.0% (w/v), which was then fermented with lactic acid bacteria (Lactobacillus bulgaricus and Streptococcus thermophilus) at $42^{\circ}C$ for 6 hr. During a period of 15 days of storage, the quality characteristics of the yogurt samples were evaluated in terms of acid production (pH and titratable acidity), levels of lactic acid bacteria, color values, viscosity, and sensory characteristics. There were no significant differences in pH during the storage period; however, the control yogurt presented the highest pH value. The 1.0% slander glasswort yogurt had the highest titratable acidity; but again, there were no significant differences among the yogurts. The 1.0% slander glasswort yogurt also had the highest level of lactic acid bacteria, and both the control and slander glasswort-containing yogurts had increasing levels of lactic acid bacteria over the storage period. The 1.0% slander glasswort yogurt had the lowest L-value and highest a- and b-values. And the slander glasswort yogurts presented lower viscosity values than the control. In sensory evaluations, the 0.25% slander glasswort yogurt scored higher than the other groups for color, flavor, viscosity, sweetness, sourness, and overall palatability. The final sensory results indicated that the 0.25% slander glasswort yogurt was superior.

Keywords

References

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