Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effect of Mulberry Powder on Antioxidant Activities and Quality Characteristics of Yogurt

오디분말을 첨가한 요구르트의 품질 및 항산화능에 미치는 영향

  • 성정민 (한국식품연구원) ;
  • 최해연 (공주대학교 식품과학부 외식상품학과)
  • Received : 2014.01.28
  • Accepted : 2014.03.27
  • Published : 2014.05.31
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Abstract

This study was conducted to investigate the effect of mulberry powder on the antioxidant activities and quality characteristics of yogurt. The samples were fermented with different amounts (0, 0.5, 1, and 3% to the yogurt quantity) of mulberry powder for 24 hr. The total phenol content, anthocyanin content, and DPPH radical scavenging activity of yogurt significantly increased with higher mulberry powder content. The pH decreased with higher mulberry powder content until 16 hr, whereas the treated groups showed higher pH levels than the control group after 20 hr. Acidities of the treated groups were higher than that of the control group upon addition of mulberry powder. Citric acid, succinic acid, and lactic acid contents of the treatment group were higher than that of the control until 16 hr, whereas the free organic acid content of the control group increased after 20 hr. The amount of lactic acid bacteria increased with higher mulberry powder content until 12 hr, whereas that of the treated group tended to decrease compared to the control group after 16 hr. Color values of mulberry yogurt were lower in terms of brightness and yellowness, whereas redness value was higher compared to the control. Mulberry yogurt groups showed higher sensory attributes than the control, except for 3% added yogurt. Consumer acceptability score of yogurt with 1% mulberry powder was ranked higher than those of other yogurts in terms of overall preference, sourness, color, flavor, and sweetness. We suggest that mulberry powder can be used to improve the quality characteristics, functionality, fermentation, and sensory evaluation of yogurt.

본 연구는 오디분말을 0, 0.5, 1, 3% 비율로 첨가한 요구르트를 제조한 후 24시간 동안 발효시키면서 시간별로 오디요구르트의 항산화 활성 및 이화학적 품질특성을 측정하고, 24시간 발효 후 관능평가를 실시하였다. 총 페놀 함량과 안토시아닌 함량 및 DPPH radical 소거능은 오디 첨가량에 따라 유의적으로 증가하였다. pH는 오디 첨가 요구르트가 발효시간이 경과할수록 대조군에 비해 유의적으로 감소하였으며, 산도는 발효 중에는 대조군을 제외한 오디 첨가군 요구르트가 첨가량에 따라 증가하였다. 유기산은 발효 16시간까지는 오디 첨가군이 대조군에 비해 함량이 높았지만, 그 이후에는 대조군의 함량이 높았다. 유산균의 생균수는 발효 8시간까지는 오디 첨가량에 따라 유산균 수가 증가하였지만 16시간 경과 후부터는 1%와 3% 요구르트의 생균수가 대조군보다 감소하는 경향을 보였다. 유당의 함유량은 발효 전 거의 차이가 없었으나 발효 24시간 이후에는 대조군의 함유량이 가장 낮았다. 유기산, 유산균, 유당 분석 결과 오디는 요구르트 발효의 일정기간까지는 첨가량에 따라 요구르트 발효에 상당한 영향을 주지만 지속적인 영향을 미치진 못하는 것으로 사료된다. 색도 측정에서 오디분말을 첨가할수록 L값과 b값은 감소했으며 a값은 증가하였다. 오디 첨가 요구르트의 관능적 품질평가 결과 1% 첨가군이 모든 항목에서 가장 높은 점수를 받았으며, 3% 첨가군은 대조군보다 관능평가에서 낮은 점수를 받았다. 이러한 결과로 보아 요구르트를 제조 시 1%의 오디분말 첨가는 요구르트의 발효와 품질특성을 향상시키고 기호도를 증가시키는 것으로 사료된다.

Keywords

References

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