Comparison of Rice Properties Between Rice Grown Under Conventional Farming and One Grown Under Eco-Friendly Farming Using Hairy Vetch

친환경 무농약 재배와 관행 재배 쌀의 특성비교

The properties of non-waxy rice, Dongjin 1, cultivated with conventional farming (CF) and environmentally-harmonized farming (EHF) using hairy vetch were compared to determine rice water absorption, physicochemical and pasting properties, antioxidant activities of brown and white rice, and a sensory evaluation of cooked white rice was carried out. EHF was treated with green manure crops such as hairy vetch and chitinase, which produce microorganism culture solution. CF was applied with seed disinfection treatments, fertilizer herbicides, and agricultural chemicals for the control of pests and diseases. The absorption level of EHF rice was higher than that of CF rice grain, regardless of the cultivation methods used. The ash and crude lipid contents were higher, but protein and dietary fiber contents were lower in the CF rice than in the EHF rice. The total starch content, water binding capacity, and swelling power of white rice were higher than those of brown rice, regardless of the cultivation methods used. The DPPH's antioxidant activity was shown as follows: EHF brown rice, EHF white rice and CF rice, in a decreasing order. The initial pasting temperature of EHF rice was lower than that of CF rice, but the peak, cold, and breakdown viscosities exhibited reverse trends. The sensory evaluation showed that the cooked white rice cultivated with EHF was not significantly different from that cultivated with CF (p<0.05). The overall preference of cooked rice did not show significant differences between the two cultivation methods (p<0.05).

일반 멥쌀인 동진1호 품종으로 녹비작물인 헤어리베치를 이용하여 친환경 무농약 재배와 관행 재배한 쌀로 현미와 백미로 도정하여 수분흡수력, 이화학적 특성과 호화특성 및 밥의 관능평가를 실시한 결과 다음과 같다. 쌀알의 수분흡수력은 친환경 재배 쌀이 도정에 관계없이 모두 높았으며 단백질과 식이섬유는 친환경재배 쌀이 회분과 지방질은 관행재배 쌀이 더 높았고 현미가 백미보다 높았다. 총 전분함량, 물결합능력, 팽윤력은 백미가 현미에 비해 높았으며 재배방법에 따른 차이는 거의 없었다. DPPH에 의한 항산화 활성은 친환경재배 현미가 가장 높고 친환경 백미 관행재배 쌀순이었다. 쌀가루 호화액의 초기 호화온도는 현미보다는 백미, 관행재배보다는 친환경재배 쌀이 더 낮았고 피크 점도는 반대 경향을 보여 친환경재배 백미가 가장 높은 점도를 나타냈다. 밥의 관능평가 결과 관행재배와 친환경재배 모두 차이조사와 기호조사에서 유의적인 차이를 보이지 않았다(p<0.05). 이로부터 친환경재배 쌀의 가공적성이 더 좋은 가능성을 보이는 것으로 추정되며 밥을 지었을 때는 두 재배방법간 차이가 거의 없음을 알 수 있었다.