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广西师范大学学报(自然科学版) ›› 2020, Vol. 38 ›› Issue (6): 88-101.doi: 10.16088/j.issn.1001-6600.2020.06.011
朱衡1,2,3,4, 张继福5, 张云1,2,3, 胡云峰1,2,3*
ZHU Heng1,2,3,4, ZHANG Jifu5, ZHANG Yun1,2,3, HU Yunfeng1,2,3*
摘要: 本文利用碳二亚胺EDC作为羧基载体LX-1000IDA的活化剂,通过脂肪酶的表面氨基,将脂肪酶固定于羧基载体上,制成固定化海洋脂肪酶IDA-LIPASE。通过单因素实验、Plackett Burman试验和正交试验,对载体-酶液和交联剂的添加顺序、缓冲液浓度、温度、pH、载体量、时间和碳二亚胺EDC浓度等进行优化和筛选,得到的最佳固定化条件为:pH4.5、载体量0.2 g、时间6 h、温度25 ℃、EDC质量分数0.6%,制备得到酶活力为114 U/g的固定化酶。对该条件进行了10倍扩大固定化,制备得到的固定化脂肪酶IDA-LIPASE酶活力为210 U/g。对制备的固定化酶酶学性质鉴定表明:固定化酶与游离酶相比,最适反应温度提高10 ℃,最适反应pH向碱性方向移动0.5,重复使用7次还保留40%左右的酶活,具有优异的热稳定性;固定化酶在4 ℃保存30 d后保留84.6%酶活。该固定化酶IDA-LIPASE相比于游离酶更能适应工业生产环境,具备实际生产应用的潜力和价值。
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[1] | 林海蛟, 张继福, 张云, 胡云峰. 基于大孔吸附树脂先交联后吸附法固定化脂肪酶[J]. 广西师范大学学报(自然科学版), 2020, 38(4): 100-108. |
[2] | 徐珊, 李任强, 张继福, 张云, 孙爱君, 胡云峰. 使用国产环氧树脂LXEP-120固定化脂肪酶研究[J]. 广西师范大学学报(自然科学版), 2018, 36(4): 108-118. |
[3] | 钟成华, 张文东, 刘鹏, 陈建. 包埋固定化复合菌低温下处理养猪废水研究[J]. 广西师范大学学报(自然科学版), 2011, 29(3): 52-56. |
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