Fluid extract is a type of fluid-solid extraction, that usually employ Soxhlet Apparatus to extract certain compound with known solubility in a solvent. Such as extracting lipids from a plant(solid) using ethanol(liquid). In recent years this has expanded to include specialized extraction methodologies and equipment of a proprietary nature to ratio-intact extract multiple groups of compounds with discovered solubility in a solvent. Such as extracting polysaccharides, resins and organic acids from a plant(solid) using glycerol(liquid).