Centre of Research in Ionic Liquids, Universiti Teknologi PETRONAS, Seri Iskandar, Perak, Malaysia; Fundamental and Applied Sciences Department, Universiti Teknologi PETRONAS, Seri Iskandar, Perak, Malaysia.
Centre of Research in Ionic Liquids, Universiti Teknologi PETRONAS, Seri Iskandar, Perak, Malaysia.
Ultrason Sonochem. 2021 Jun;74:105576. doi: 10.1016/j.ultsonch.2021.105576. Epub 2021 Apr 25.
This study investigates the potential of using small amounts of ionic liquids (IL) to enhance ultrasound-assisted extraction of lipids content from green microalgae. Three imidazolium-based ILs (butyl, octyl and dodecyl), each of them with two anions (bromide and acetate) were tested as additives. Viscosity and surface tension of the ILs aqueous mixtures were analyzed to determine the influence of ILs' anions and alkyl chain length, whereas KI dosimetry experiments were used as an indicator of radicals formation. A key finding suggests that the small addition of ILs improves the ultrasonication either by enhancing the viscosity and reducing the water surface tension, leading to a more powerful acoustic cavitation process or by increasing HO° production likely to oxidize the microalgae cells membranes, and consequently disrupting them on a more efficient manner. KI dosimetry also revealed that long ILs alkyl chain is detrimental. This experimental observation is confirmed thus strengthened as the yield of extracted lipids from green microalgae has shown an incremental trend when the IL concentration also increased. These hypotheses are currently under investigation to spot detailed impact of ILs on cavitation process.
本研究旨在探讨少量离子液体（IL）在增强超声辅助提取绿色微藻中脂质含量方面的潜力。本研究选用了三种基于咪唑的 IL（丁基、辛基和十二烷基），每个 IL 有两种阴离子（溴化物和醋酸盐）作为添加剂。分析了 IL 水混合物的粘度和表面张力，以确定 IL 阴离子和烷基链长度的影响，而 KI 剂量测定实验则用作自由基形成的指示剂。一项关键发现表明，少量 IL 的添加通过增强粘度和降低水的表面张力，从而增强更强大的声空化过程，或者通过增加 HO°的产生，可能氧化微藻细胞的细胞膜，从而更有效地破坏细胞膜，从而改善超声处理。KI 剂量测定还表明，IL 的长烷基链是有害的。这种实验观察得到了证实，因为从绿色微藻中提取的脂质产量随着 IL 浓度的增加呈递增趋势。目前正在研究这些假设，以发现 IL 对空化过程的详细影响。
