This work reports the first lipase-catalyzed reactions between substrates of different polarities using deep eutectic solvents as a medium. The model reaction consisted of a lipophilization process based on the alcoholysis of phenolic esters using immobilized Candida antarctica lipase B as a biocatalyst. Results showed that water could dramatically improve the lipase activity and change the reactivity of phenolic substrates. Indeed, very low conversions (<2%) were observed in pure DES, whereas in DESâwater binary mixtures, quantitative conversions were achieved. After investigating the role of various parameters, such as the substrate concentration and ratio, pH or thermodynamic activity of water, the effect of the presence of water in pure DES based on urea or glycerol was discussed. In this paper, we propose new perspectives for the enzymatic modification of polar substrates using this novel generation of green, inexpensive and easy-to-handle solvents.
这项研究首次报道了以深共晶溶剂为介质催化不同极性底物之间的
脂肪酶反应。模型反应包括一个基于
酚酯醇解的亲脂化过程,使用固定化的南极念珠菌
脂肪酶 B 作为
生物催化剂。结果表明,
水能显著提高
脂肪酶的活性,并改变
酚类底物的反应活性。事实上,在纯 DES 中观察到的转化率非常低(小于 2%),而在 DESâ
水的二元混合物中则实现了定量转化。在研究了底物浓度和比例、pH 值或
水的热力学活性等各种参数的作用后,我们讨论了在基于
尿素或
甘油的纯 DES 中
水的存在所产生的影响。在本文中,我们提出了使用这种新一代绿色、廉价和易于处理的溶剂对极性底物进行酶修饰的新前景。