Wallace Ribeiro da Silva, Camila Fernanda de Aquino Luna, Joyce Gueiros Wanderley Siqueira, Jorge Vinícius Fernandes Lima Cavalcanti, Rodrigo Lira de Oliveira, Tatiana Souza Porto
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引用次数: 0
摘要
本研究旨在用海藻酸钙珠包埋法固定化土曲霉URM4658中的菊粉酶。在1.25%海藻酸钠和0.35 M CaCl2的条件下,固化时间为90 min,固定化率为92.72%。固定化酶的最佳pH和温度分别为7.0°C和60°C,在固定化过程中对底物的亲和力增加,与自由形式相比,Km减少。此外,固定化菊粉酶在50°C和60°C时表现出良好的热稳定性,分别从t1/2 (649.83 ~ 420.84 min)和d值(2158.67 ~ 1398.00 min)观察到。该固定化生物催化剂具有良好的可重复使用性,在10个反应循环后仍保持92.73%的剩余活性,在30天的储存后活性没有损失。用固定化菊糖酶在填充床反应器中连续水解菊糖,总还原糖和糖糖的最大释放量分别为3.27和0.82 g L-1。结果表明,固定化生物催化剂是一种很有前途的生物工艺替代方案,涉及富含菊粉的原料。
Immobilization of Aspergillus terreus URM4658 inulinase in calcium alginate beads, evaluation of their biochemical characteristics and kinetic/thermodynamic parameters, and application on inulin hydrolysis.
The present study aimed to immobilize an inulinase obtained from Aspergillus terreus URM4658 by entrapment in calcium alginate beads. The immobilization process yielded a satisfactory yield (92.72%) using 1.25% sodium alginate and 0.35 M CaCl2 with a curing time of 90 min. The immobilized enzyme exhibited optimum pH and temperature at 7.0 and 60 °C, respectively, showing an increased affinity for the substrate after the immobilization process, as evidenced by the decrease in Km compared to its free form. Moreover, the immobilized inulinase demonstrated good thermostability at 50 and 60 °C, as observed from the t1/2 (649.83-420.84 min) and D-values (2158.67-1398.00 min), respectively. The immobilized biocatalyst also exhibited good reusability, maintaining 92.73% of residual activity after 10 reaction cycles and no loss of activity after 30 days of storage. A continuous inulin hydrolysis operation in a packed bed reactor was performed using the immobilized inulinase, and a maximum release of total reducing sugars and nystose of 3.27 and 0.82 g L-1, respectively, was observed. The results indicate that an immobilized biocatalyst is a promising alternative for bioprocess involving inulin-rich feedstocks.
期刊介绍:
Preparative Biochemistry & Biotechnology is an international forum for rapid dissemination of high quality research results dealing with all aspects of preparative techniques in biochemistry, biotechnology and other life science disciplines.