Fecha de publicación: 22/02/1990 Fuente: WIPO "apiculture" The invention relates to the production of biologically active extracts rich in vitamin C and aroma substances and resistant to light and heat. According to the process of the invention one or more plant or plant-parts containing 0.1 to 99 % by weight of natural colouring substances, acids and/or antioxidants are extracted together or separately cold and/or warm for 1 minute to several days, at a temperature of -20°C to +200°C, optionally at an elevated or reduced pressure, optionally in a CO2, nitrogen oxide or acetic acid atmosphere, with or without flavour or aroma substances, salts, acids, bases, sugars, water or organic solvents, and the treatment optionally is once or more times repeated. The process according to the invention enables the preparation of biologically active, light- and heat-resistant extracts rich in vitamin C, aroma substances and active ingredients from easily available plants. The extracts obtained by the process according to the invention can be used for medicines, cosmetics, foodstuffs, further as nutritives, additives to fodder, for promoting germination or as sprays for controlling insects.