title: The leaves of Stevia rebaudiana (Bertoni), their constituents and the analyses thereof: a review.
abstract: The plant  Stevia rebaudiana  is well-known due to the sweet-tasting ent-kaurene diterpenoid glycosides. Stevioside and rebaudioside A are the most abundant and best analyzed, but more than 30 additional steviol glycosides have been described in the scientific literature to date. Most of them were detected in the last two years. This paper reviews these new compounds and provides an overview about novel trends in their determination, separation, analysis, detection, and quantification. The detection and analysis of further constituents such as nonglycosidic diterpenes, flavonoids, chlorogenic acids, vitamins, nutrients, and miscellaneous minor compounds in the leaves of  Stevia rebaudiana  are reviewed as well. A critical review of the antioxidant capacity of  Stevia  leaves and its analysis is also included. These different aspects are discussed in consideration of the scientific literature of the last 10 years.
authors.affiliation: Department of Nutrition and Food Sciences, Food Chemistry/Bioanalytics, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany. woelwer-rieck@uni-bonn.de
authors.forename: Ursula
authors.initials: U
authors.lastname: Wölwer-Rieck
mesh_terms: D000975:Antioxidants / Q000032:analysis; D002726:Chlorogenic Acid / Q000032:analysis; D005419:Flavonoids / Q000032:analysis; D006027:Glycosides / Q000032:analysis / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry*; D059808:Polyphenols / Q000032:analysis; D036625:Stevia / Q000737:chemistry*; D013549:Sweetening Agents; D014815:Vitamins / Q000032:analysis
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D006027:Glycosides; D059808:Polyphenols; D013549:Sweetening Agents; D014815:Vitamins; D002726:Chlorogenic Acid