Solvent extraction The solvent extraction method uses a solvent to extract the effective ingredients from the solid raw material. The solvent used must have the characteristics of mutual solubility with the extracted solute. After the plant material is crushed, it is put into a suitable container, and several times the amount of solvent is added. The extraction can be carried out by dipping, percolating, decocting, refluxing and continuous extraction. In the extraction process of the solvent extraction method, the concentration of the solvent, the ratio of material to liquid, the extraction temperature, and the extraction time will directly affect the extraction rate of the effective ingredients. Cristina Juan et al. used solvent extraction to extract ochratoxin A from rice, and used fluorescence detection and liquid chromatography to determine the content of OTA. The study showed that under the conditions of the most suitable material-to-liquid ratio, extraction temperature and extraction time , The highest OTA content of the extract is 4.17ng/g. Monte D. Holt et al. used solvent extraction to extract alkylresorcinol from raw and cooked wheat seeds. Experiments show that solvent extraction can save extraction time.