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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Physicochemical Property and Antioxidative Activity of Hot-Water Extracts from Enzyme Hydrolysate of Astragalus membranaceus

황기 효소분해물 열수추출액의 이화학적 특성 및 항산화 활성

  • Published : 2010.03.31
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Abstract

To enhance the yield and bioactivity of hot-water extract from herbal medicine, Astragalus membranaceus was hydrolyzed with carbohydrases, such as ClariSEB and Fungamyl. After hot-water extracts were prepared from each hydrolysate (HW-C/F), physicochemical property, antioxidant activity and sensory property were evaluated. The solid content ($^{\circ}Brix$) of HW-C/F was higher than hot-water extract from A. membranaceus no treated enzyme (control). Although pH of HW-C/F was lower than that of the control, the acidity was higher. Lightness of Hunter's color values was increased in HW-C/F whereas redness and yellowness were decreased. The contents of reducing sugar, flavonoid and polyphenol of HW-C/F were higher than the control but the content of ascorbic acid was not different from control. The inhibitory activity of HW-C/F against lipid peroxidation was slightly higher than control, but DPPH radical scavenging, ABTS reducing, metal chelating activities were significantly increased by HW-C/F. The sensory evaluation also revealed that the sensory panelists preferred HW-C/F to that of control. Therefore, hydrolysis by carbohydrases for preparation of hot-water extract from A. membranaceus is one of the good methods to improve antioxidative activity and sensory property of hot-water extract.

황기 추출액의 수율 및 생리적 기능성을 향상시키기 위하여 황기에 효소를 첨가하여 시간별로 가수분해 시킨 후 가열처리하고 여과시킨 추출액에 대하여 이화학적, 항산화 활성 및 관능적 평가를 측정하였다. 효소처리 황기 추출액의 $^{\circ}Brix$의 변화는 대조군보다 ClariSEB 및 Fungamyl 처리 시 증가하였으며 pH 및 산도는 효소처리에 의하여 약간 낮은 pH와 높은 산도를 보였다. 색상변화에서는 ClariSEB 및 Fungamyl 처리 시 lightness가 증가하였으며 redness와 yellowness는 감소하였다. 환원당, flavonoid 및 polyphenol 화합물 함량은 효소처리에 의하여 함량이 증가하였으나 ascorbic acid는 대조군과 유사하였다. 황기 추출액의 지질과 산화 억제능은 효소처리 시 억제능이 약간 증가하는 것으로 나타났고 DPPH 항산화 활성, ABTS 항산화 활성 및 금속이 온 제거능에서는 ClariSEB 및 Fungamyl 처리 시 증가하였으나 환원력은 대조군과 유사하였다. 또한 황기 추출액에 대한 관능검사 결과 전반적으로 효소처리를 하지 않은 대조군에 비하여 효소처리 시 기호도 면에서 우수한 것으로 나타났다.

Keywords

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