Obtaining extracts, biologically active substances from medicinal plants by means of modern advanced extraction technologies. Checking the quality and quantity of biologically active substances isolated from medicinal plants. Medicinal plants: phytochemical studies, antioxidant activity, determination of ascorbic acid content, determination of humidity, determination of essential oils. Spectrophotometry and thin layer chromatography. Polarimetry: determination of the amount of starch, etc. Refractometry: determination of refractory index, glucose, fructose, sucrose.