Kretovich, Plant Biochemistry [in Russian
- L. V
- Vysshaya Shkola, Moscow
Plants are known to contain significant quantities of various polyphenolic acids, such as coumaric acid and caffeic acid, as well as their glycosides and esters. Among these, 5-caffeylquinic, or chlorogenic, acid is of particularly wide distribution and high content. Of 204 randomly selected plant species, chlorogenic acid was found in almost 90 . The presence of this substance is generally recognized in sunflower and sorghum shoots, in potato tubers, in carrots, in hawthorn fruits, etc. [2, 3]. Chlorogenic acid contents in coffee beans can reach 8% . High levels of esters of this compound are also typical of the so-called honey grass Stevia rebaudiana Bertoni, which has good potential as a raw material for preparing the sugar substitute stevioside . Data on the presence of chlorogenic and caffeic acids in Stevia extracts have been presented elsewhere . In recent years, Stevia has been cultivated in greenhouses in the Volgograd Agricultural Company SPK Teplichnoe, and the Volgograd Scientific Medical Company Medifarm has prepared a lyophilized extract from Stevia grass, with a high level of the sugar substitute (up to 12%). Apart from stevioside and its analogs, the extract contains significant quantities of free amino acids, including particularly large amounts of proline . The aim of the present work was to measure the level of chlorogenic acid accompanying the sugar substitute in the leaves and various fractions obtained during the processing of Stevia.