Effects of Mugwort on Physicochemical Properties, Paste, and Gel of Rice Flour

쑥이 쌀가루의 이화학적 성질, 페이스트, 겔에 미치는 영향

The effects of mugwort on some physicochemical properties of rice flour, on the viscosity of rice flour pastes (2 and 4%), on the hardness and the freeze-thaw stability of rice flour gels (20 and 40%), and on the degree of gelatinization (DG) of pastes and gels were investigated. By addition of mugwort, water holding capacity, swelling power, and solubility of rice flour were increased. The rice flour pastes became thicker by addition of mugwort, but viscosities of both the rice flour pastes and the rice flour-mugwort pastes, without noticeable difference between them, were decreased during storage at $25^{\circ}C\;and\;4^{\circ}C$ for 7 days. The rice flour gels became firmer by addition of mugwort and hardnesses of both the rice flour gels and the rice flour-mugwort gels were increased during storage, especially at $4^{\circ}C$. DGs, measured by glucoamylase digestion, of pastes and gels were decreased slightly during storage. Freeze-thaw stability of gels was not affected by addition of mugwort.

쑥의 첨가로 물결합능력, 팽윤력, 용해도는 모두 증가 하였으며 이는 쑥의 이런 성질이 쌀가루보다 크기 때문이었다. 쑥의 첨가로 페이스트의 점도는 상승하였으나, 저장중($25^{\circ}C,\;4^{\circ}C$에서 7일)에는 페이스트와 쑥첨가 페이스트의 점도가 모두 뚜렷하게 변하지 않았다. 겔은 쑥첨가로 더 단단해졌으며 저장중 경도는 쌀가루 겔과 쑥첨가겔이 모두 크게 증가하였고 특히 $4^{\circ}C$ 저장의 경우 심하였다. Glucoamylase에 의한 가수분해 방법으로 측정한 페이스트와 겔의 저장중의 호화도는 제조직 후의 $94{\sim}100%$에서 7일 저장 후 $92{\sim}98%$로 감소하였다. 쌀가루 겔의 냉동-해동시 안정성은 쑥에 의해 영향을 별로 받지 않은 것으로 나타났다.