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Quality Characteristics of Onions Applied with Methylsulfonylmethane (MSM) during Cultivation

양파 재배 중 식이유황 methylsulfonlymethane 처리가 양파의 품질 특성에 미치는 영향

  • Kwon, Eunjin (Department of Food and Nutrition, Kangwon National University) ;
  • Ryu, Dayeon (Department of Food and Nutrition, Kangwon National University) ;
  • Surh, Jeonghee (Department of Food and Nutrition, Kangwon National University)
  • 권은진 (강원대학교 식품영양학과) ;
  • 류다연 (강원대학교 식품영양학과) ;
  • 서정희 (강원대학교 식품영양학과)
  • Received : 2012.11.02
  • Accepted : 2012.11.30
  • Published : 2013.04.30

Abstract

Two types of onions cultivated with different methods of sulfur application (designated as S-1 and S-2) were examined for their physicochemical and sensory properties, and then compared with onions without sulfur application as a control. During cultivation, dietary sulfur methylsulfonylmethane (MSM) was sprayed on the leaves twice starting at 2 months before harvest, with one month intervals for S-1. For S-2, the MSM was applied once onto surface soils before sowing, and then once again on the leaves at 2 months before harvest. Thiosulfinate, a major sulfur-containing compound in onions, increased in the order of control, S-1, and S-2, without noticeable differences in the strength of spicy hot taste and flavor. The S-2 onions demonstrated a total reducing capacity three times higher than control and S-1 did. It indicates that the application of sulfur would positively affect the quality of onions under the condition where sufficient time is given for soil mineralization.

국내 토양층에 절대적으로 부족한 원소인 황을 양파 재배 중 처리함으로써 유황 처리가 식품 소재로서의 양파의 품질특성에 미친 영향을 평가하고자 하였다. 본 연구에서는 $25,000m^2$ 농지를 세 구역으로 구분하여, 식이유황 MSM을 수확 2달 전 1달 간격으로 2회 처리한 군(S-1), 파종 시 토양에 직접 1회 처리하고 이후 수확 2달 전에 1회로 추가 처리한 군(S-2), MSM 유황을 처리하지 않고 재배한 양파를 대조군으로 하였다. 수확 이후 3종 양파의 품질 특성은 화학적 조성, 물리적 특성, 관능적 특성 분석으로 구분하여 비교 평가하였다. 3종 양파 모두 유황의 처리 유무 및 시기에 관계없이 칼슘(Ca)과 철(Fe) 함량이 높게 나타났고, 이는 양파의 무기질 조성에 유황의 일시적 처리 유무보다는 지역 토양 자체의 특성이 더 크게 작용했음을 시사하였다. 한편, 양파의 대표적 유기 황 화합물인 thiosulfinate와 총 환원력은 파종 전 유황을 토양에 직접 처리한 S-2군에서 대조군에 비해 각각 20%와 2.9배 높은 값을 나타냄으로써 유황 처리 유무 및 처리 방법에 따른 차이를 확인할 수 있었다. 그러나, 3종 양파 모두 매운 맛과 향은 유의적으로 다르지 않아 화학적 조성의 차이가 관능적으로 인지 가능한 수준은 아닌 것으로 해석되었다. S-1, S-2양파는 대조군에 비해 낮은 명도로 그 색이 등색에 가까웠으며, 유황 처리로 양파의 색 특성에 대한 기호도를 향상시켰다. 양파의 아삭거리는 정도에 대한 물리적 지표로 선정 평가된 경도와 저작성은 양파의 압착 방향에 따라 값의 차이가 크게 나타났으나, 전반적으로는 S-1, S-2 양파에서 대조군 보다 높은 저작성 값을 나타내었다. 그러나, 이 수준의 차이는 아삭함의 관능적 특성 및 그 기호도에는 유의적 차이를 유발하지 않았다. S-1, S-2 양파는 대조군과 비교 시 종합적 기호도에서 서로 다르지는 않았으나, 양파의 색과 단맛에 대한 기호도를 상승시켰다. 특히, S-2 양파에서 관찰된 thiosulfinate 증가와 총 환원력 증가 결과는, 토양층이 적정 유황을 함유할 수 있도록 지속적 유황 처리가 이루어진다면 양파의 기능성과 관능성이 개선될 수 있음을 시사하였다.

Keywords

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