Development of Magnetic Deep Eutectic Solvent-Based Liquid–Liquid Extraction for the Selective Extraction and Separation of RNA

Four kinds of hydrophobic magnetic deep eutectic solvents (HMDESs) were prepared and applied to RNA extraction. Based on the HMDESs, a mechanical shaking-assisted liquid–liquid extraction (MSLLE) was developed for the extraction of RNA. Factors that influence the extraction, including the extraction time, temperature, volume of HMDES, buffer types, and pH, were evaluated. After the optimization of all conditions, the RNA extraction efficiency was 82.31 ± 0.02%. RNA can be extracted from complex samples and medicinal yeast by the method proposed in this work and can be recovered from the HMDESs after being extracted.