Stevia impurity (13-[(2-O-6-deoxy-¦Â-D-glucopyranosyl-3-O-¦Â-D-glucopyranosyl-¦Â-D-glucopyranosyl)oxy]ent-kaur-16-en-19-oic acid ¦Â-D-glucopyranosyl ester)
Reference standards.
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Carbohydrate Research, 2011, 346(8):1057-1060.
Structures of the novel diterpene glycosides from Stevia rebaudiana.[Reference:
WebLink]
METHODS AND RESULTS:
From the commercial extract of the leaves of Stevia rebaudiana, two new diterpenoid glycosides were isolated besides the known steviol glycosides including stevioside, rebaudiosides A-F, rubusoside, and dulcoside A.
CONCLUSIONS:
The structures of the two new compounds were identified as 13-[(2-O-6-deoxy-β-d-glucopyranosyl-β-d-glucopyranosyl)oxy] ent-kaur-16-en-19-oic acid β-d-glucopyranosyl ester (1), and Stevia impurity (13-[(2-O-6-deoxy-β-D-glucopyranosyl-3-O-β-D-glucopyranosyl-β-D-glucopyranosyl)oxy]ent-kaur-16-en-19-oic acid β-D-glucopyranosyl ester) (2), on the basis of extensive NMR and MS spectral data as well as chemical studies.
![Stevia impurity (13-[(2-O-6-deoxy-¦Â-D-glucopyranosyl-3-O-¦Â-D-glucopyranosyl-¦Â-D-glucopyranosyl)oxy]ent-kaur-16-en-19-oic acid ¦Â-D-glucopyranosyl ester)](http://www.chemfaces.com/structural/Stevia-impurity-1-CFN95229.jpg "Stevia impurity (13-[(2-O-6-deoxy-¦Â-D-glucopyranosyl-3-O-¦Â-D-glucopyranosyl-¦Â-D-glucopyranosyl)oxy]ent-kaur-16-en-19-oic acid ¦Â-D-glucopyranosyl ester)")
