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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Changes in Solubility of Barley Arabinoxylans during Malting

보리의 제맥과정 중 Arabinoxylan의 용해성 변화

  • Eom, Hye-Seon (Dept. of Food Science and Biotechnology, Kyungwon University) ;
  • Lee, Young-Tack (Dept. of Food Science and Biotechnology, Kyungwon University)
  • 엄혜선 (경원대학교 식품생물공학과) ;
  • 이영택 (경원대학교 식품생물공학과)
  • Published : 2008.12.31
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Abstract

Barleys at different malting stages from steeping to 5 day germination were investigated for soluble, insoluble, and total arabinoxylans at three different extraction temperatures of 21, 45 and $65^{\circ}C$. Slight differences in total arabinoxylan levels in barleys were observed during malting stages. During germination, initially insoluble arabinoxylan could be more soluble, thus the solubilized arabinoxylan tended to increase until 4 day germination. The proportion of soluble arabinoxylan in germinating barleys was increased from ambient temp ($21^{\circ}C$) to 45 or $65^{\circ}C$. Two barley malt samples were selected at two different stages of germination, well-modified malt germinated for 96 hr and poorly-modified malt for 60 hr, and mashed isothermally at 45, 55, 65, or $75^{\circ}C$ for 2 hr. Increasing temperature over 45 to $75^{\circ}C$ slightly decreased the amount of arabinoxylan solubilized in wort. Arabinoxylan content of wort from well-modified malt was not significantly different from poorly- modified malt at all mashing temperatures.

보리를 침맥한 후 5일 동안 발아하는 제맥과정 중에 arabinoxylan 함량의 변화를 측정하였다. 제맥과정 중 초기에 불용성인 보리의 arabinoxylan은 발아과정 중에 가용화됨에 따라 수용성 arabinoxylan의 함량이 약간 증가하는 추세를 보여주었다. 발아중인 보리의 수용성 arabinoxylan 부분은 $21^{\circ}C$ 추출온도에 비해 $45^{\circ}C$의 추출온도에서 보다 높은 함량 으로 나타났다. 발아시간에 따라 적절히 변형된 맥아(96시간 발아)와 덜 변형된 맥아(60시간 발아)를 선발하여 변형정도 에 따른 두 가지 맥아에 대하여 당화온도별로($45{\sim}75^{\circ}C$) 당 화 후 맥즙의 arabinoxylan 함량을 분석하였다. 당화온도를 $45^{\circ}C$에서 $75^{\circ}C$를 증가시킴에 따라 맥즙에 용출되어져 나오는 arabinoxylan의 함량은 약간 감소하는 경향을 보였다. 본 실험의 당화조건에서 적절히 변형된 맥아로부터 얻은 맥즙과 덜 변형된 맥아로부터 얻은 맥즙 간의 arabinoxylan 함량에서 큰 차이를 나타내지 않았다.

Keywords

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