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Effect of Calcium on Immobilization of Rice (Oryza sativa L.) Peroxidase for Bioassays in Sodium Alginate and Agarose Gel
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  • Effect of Calcium on Immobilization of Rice (Oryza sativa L.) Peroxidase for Bioassays in Sodium Alginate and Agarose Gel
  • Effect of Calcium on Immobilization of Rice (Oryza sativa L.) Peroxidase for Bioassays in Sodium Alginate and Agarose Gel
저자명
Nahakpam. Sareeta,Singh. Puneeta,Shah. Kavita
간행물명
Biotechnology and bioprocess engineering
권/호정보
2008년|13권 5호|pp.632-638 (7 pages)
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한국생물공학회
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정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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The direct immobilization of soluble peroxidase isolated and partially purified from shoots of rice seedlings in calcium alginate beads and in calcium agarose gel was carried out. Peroxidase was assayed for guaiacol oxidation products in presence of hydrogen peroxide. The maximum specific activity and immobilization yield of the calcium agarose immobilized peroxidase reached $2,200;U;mg^{-1}$ protein ($540;mU;cm^{-3}$ gel) and 82%, respectively. In calcium alginate the maximum activity of peroxidase upon immobilization was $210;U;mg^{-1}$ bead with 46% yield. The optimal pH for agarose immobilized peroxidase was 7.0 which differed from the pH 6.0 for soluble peroxidase. The optimum temperature for the agarose immobilized peroxidase however was $30^{circ}C$, which was similar to that of soluble peroxidase. The thermal stability of calcium agarose immobilized peroxidase significantly enhanced over a temperature range of $30{sim}60^{circ}C$ upon immobilization. The operational stability of peroxidase was examined with repeated hydrogen peroxide oxidation at varying time intervals. Based on 50% conversion of hydrogen peroxide and four times reuse of immobilized gel, the specific degradation of guaiacol for the agarose immobilized peroxidase increased three folds compared to that of soluble peroxidase. Nearly 165% increase in the enzyme protein binding to agarose in presence of calcium was noted. The results suggest that the presence of calcium, ions help in the immobilization process of peroxidase from rice shoots and mediates the direct binding of the enzyme to the agarose gel and that agarose seems to be a better immobilization matrix for peroxidase compared to sodium alginate.