Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Effects of mulberry concentrate on lipid oxidation of Yackwa during its storage

오디 농축액이 약과의 저장 중 지질산패에 미치는 영향

  • Shin, Suk-Kyung (Department of Food and Nutrition, Chungnam National University) ;
  • Kim, Hyun-Jeong (Department of Food and Nutrition, Chungnam National University) ;
  • Kim, Mee-Ree (Department of Food and Nutrition, Chungnam National University)
  • 신숙경 (충남대학교 식품영양학과) ;
  • 김현정 (충남대학교 식품영양학과) ;
  • 김미리 (충남대학교 식품영양학과)
  • Received : 2014.04.22
  • Accepted : 2014.07.07
  • Published : 2014.08.30
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Abstract

This study was conducted to evaluate the quality and to inhibit the lipid oxidation of Yackwa with 0, 1, 2, or 3% mulberry concentrate added. We stored Yackwa at $60^{\circ}C$ for three weeks. After the three-week storage, the acid value of the Yackwa with mulberry concentrate was lower than that of the control Yackwa. The hydroperoxide value (22.39 meq/kg) of the Yackwa with 3% mulberry concentrate at two weeks of storage was 50% lower than that of the control Yackwa (47.03 meq/kg). Also, after three-week storage, the TBA value of the Yackwa with 3% mulberry concentrate was about two times lower than that of the control group. The L and b values in the Hunter color system of the Yackwa with mulberry concentrate decreased significantly as the amount of the mulberry added increased, whereas the a value increased. The antioxidant activity, such as the DPPH radical scavenging activity, significantly increased in the Yackwa with mulberry concentrate, unlike in the control. These results might have been caused by the mulberry concentrate, which contains an antioxidant. The ability of the mulberry concentrate to delay the rancidity of the Yackwa was due to its antioxidant activity.

본 연구에서는 오디 농축액을 우리나라 전통한과인 약과에 첨가하여 약과의 저장 중 품질 특성에 미치는 영향에 대하여 분석하였다. 약과의 수분함량은 대조군에 비하여, 오디 농축액 3% 첨가 약과가 높은 수분함량을 나타내었다. 저장 기간별 약과의 수분함량은 모든 군에서 2주 동안 급격한 수분함량의 감소를 나타내었고, 2주와 3주의 수분함량 변화는 유의적 차이를 나타내지 않았다(p<0.05). 오디 농축액을 첨가한 약과의 색도는 0주차의 오디 약과에서는 명도(L)는 대조군에 비해 오디 농축액의 첨가량이 많아질수록 낮아지는 경향을 보였고, 적색도(a)는 대조군 5.88, 오디 농축액 3% 첨가군은 6.69로 오디 농축액을 첨가할수록 높게 나타났다. 또한 황색도(b)는 18.32~11.51로 오디 농축액 첨가량이 높아질수록 낮아지는 경향을 보였다. 명도(L)는 저장기간이 지남에 따라 대조군이 58.56에서 46.45로, 오디 농축액 3% 첨가군은 43.82에서 35.92로 낮아졌고, 적색도(a)와 황색도(b) 모두 3주가 경과하면서 높아지는 것을 볼 수 있었다. 지질산패정도를 알아보는 실험중 산가는 시간이 경과함에 따라 유의적 차이가 나타나(p<0.05) 3주차 오디 농축액을 첨가한 약과는 1.65~1.91의 산가를 나타내었고, 대조군은 1.97로 오디 농축액 첨가군이 대조군보다 산가보다 더 낮게 나타났다. 과산화물가는 0주차에는 시료간의 유의적인 차이가 나타나지 않다가 3주차에는 대조군 63.80 meq/kg, 오디 농축액 1% 첨가군 58.46 meq/kg, 2% 첨가군 55.00 meq/kg, 3% 첨가군 52.54 meq/kg로 대조군의 과산화물가가 오디 농축액 첨가군에 비해 높은 경향을 나타내었다. 0주차 TBA가는 11.25~13.11로 오디 농축액을 첨가할수록 낮은 값을 나타내었고, 3주가 경과한 후 TBA측정 결과 대조군이 가장 높은 TBA가를 나타내었으며 오디 농축액 3% 첨가군이 가장 낮게 측정되었다. DPPH 라디칼 소거능은 오디 농축액의 첨가량이 많아질수록 증가하는 경향을 나타내었고, 저장 기간 동안 모든 군의 DPPH 라디칼 소거능은 감소하였으나 오디 농축액 첨가군이 대조군에 비해 낮은 $IC_{50}$값을 유지하였다. 실험의 결과들로부터 오디 농축액의 첨가량이 증가할수록 항산화성이 높아지고, 지질산패를 억제되는 것을 확인하였다. 이는 항산화성의 증가로 인해 오디 농축액을 넣은 약과가 넣지 않은 약과보다 지질산패가 억제되는 것으로 사료되며, 약과 제조시 오디 농축액을 첨가하면 저장성이 증대된 약과를 생산할 수 있을 것으로 기대된다.

Keywords

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