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Effect of Angiotensin-I Converting Enzyme Inhibitory from Hydrolysate of Soybean Protein Isolate

분리대두단백질 가수분해물의 Angiotensin-I Converting Enzyme 저해효과

  • Published : 2010.01.30

Abstract

The angiotensin converting enzyme (ACE) inhibition effect of soybean protein isolate hydrolysate was studied using protease. Soybean protein isolate was hydrolysed by seven enzymes (Alcalase 2.4 L, Flavourzyme 500 MG, GC 106, Multifect Neutral, Neutrase 0.8 L, Papain 30,000 and Protamex), enzyme concentrations (0, 0.5, 1.0 and 1.5%), at various hydrolysis times (0, 1, 2, 3, 4, 5 and 6 hr) and suspension concentrations (1, 5, 7, 10 and 15%). Absorbance at 280 nm, brix and ACE inhibitory activity of soybean protein isolate hydrolysates were investigated. Absorbance at 280 nm and brix of Alcalase 2.4 L treatment were higher than other enzyme treatments. The optimum condition of hydrolysis was Alcalase 2.4 L, 1% enzyme concentration, 5% suspension concentration for 4 hr. $IC_{50}$ value of ACE inhibitory activity of soybean protein isolate hydrolysate was $79.94 {\mu}g/mL$. These results suggest that soybean isolate protein hydrolysate from Alcalase 2.4 L may be of benefit for developing antihypertensive therapeutics.

분리대두단백질의 가수분해물을 제조 시, 최적 가수분해 조건을 설정하기 위하여 총 7종의 단백질 가수분해 효소를 이용하여 효소선정, 효소농도, 가수분해시간 및 분리대두단백질분말의 첨가량에 따른 단백질의 함량 정도를 나타내는 280 nm의 흡광도 측정과 수율을 대신한 brix 측정, 가수분해물의 ACE 저해활성 등을 조사하였다. 분리대두단백질 분말에 증류수를 5%의 분산농도로 하여 분해효소 Alcalase 2.4 L을 1%(v/w) 첨가하여 $65^{\circ}C$에서 4시간 동안 가열하여 가수분해하였다. 가수분해를 마친 후 효소의 반응정지를 위하여 $80^{\circ}C$에서 5분간 열처리한 후, $4^{\circ}C$로 냉각하여 원심분리(7,000 rpm, 40 min) 하였다. 원심분리 한 상등액을 취하여 여과한 후, $60^{\circ}C$에서 농축하였다. 농축액을 냉동시켜, 진공 동결건조 하여 분리대두단백질 가수분해물을 제조하였다. 분리대두단백질 가수분해물의 수율은 38.32%를 나타냈으며, ACE 저해활성($IC_{50}$)은 $79.94 {\mu}g/mL$를 나타내었다.

Keywords

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