Efficient resolution of (R,S)-1-(1-naphthyl)ethylamine by Candida antarctica lipase B in ionic liquids
作者:Bin Wang、Chao Zhang、Qinting He、Hengfei Qin、Guobin Liang、Weiqiao Liu
DOI:10.1016/j.mcat.2018.01.026
日期:2018.4
The resolution of (R,S)-1-(1-naphthyl)ethylamine ((R,S)-NEA) by Candida antarctica lipase B (CALB) in ionic liquids (ILs) containing 1-alkyl-3-methylimidazolium cations ([Cnmim]+) and [Tf2N]−, [BF4]−, and [PF6]− anions was investigated. When the alkyl chain on the cation contained less than six carbons, the lipase activity corresponded with the hydrophobicity of the ILs, but further increase in the
南极假丝酵母脂肪酶B(CALB)在含有1-烷基-3-甲基咪唑鎓阳离子的离子液体(ILs)中对(R,S)-1-(1-萘基)乙胺((R,S)-NEA)的拆分(研究了[C n mim] +,[Tf 2 N] -,[BF 4 ] -和[PF 6 ] -阴离子。当阳离子上的烷基链包含少于六个碳时,脂肪酶活性与IL的疏水性相对应,但是链长的进一步增加抑制了酶活性。酶活性根据阴离子而降低,其中[Tf 2 N] - > [PF 6 ] - > [BF 4 ] -。确定了酰基供体,pH,温度,水活度和底物浓度对分离度的影响。在最佳条件下,(R,S)-NEA的转化率和(R)-正辛基酰基-NEA的对映体过量分别为49.3%和99.2%。研究了CALB在[C 6 mim] [Tf 2 N]中对(R,S)-NEA的拆分动力学,并选择了具有两个底物抑制模型的乒乓机制。拟合结果的动力学参数如下:(的米氏常数- [R ,S)-NEA