Rebaudioside F, a diterpene glycoside from Stevia rebaudiana.

@article{Starratt2002RebaudiosideFA,
  title={Rebaudioside F, a diterpene glycoside from Stevia rebaudiana.},
  author={Alvin N. Starratt and Christopher W Kirby and Robert Pocs and James E. Brandle},
  journal={Phytochemistry},
  year={2002},
  volume={59 4},
  pages={
          367-70
        }
}
Glycosides from Stevia rebaudiana
A new laboratory method for isolating the glycosides stevioside and rebaudiosides A and C from leaves of Stevia rebaudiana was proposed. According to HPLC, the glycoside contents in plants grown in
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TLDR
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From the commercial extract of the leaves of Stevia rebaudiana, two additional new diterpenoid glycosides were isolated and their structures were characterized as ent-kaur-16-en-19-oic acid β-D-glucopyranosyl ester.
Stevioside and Related Compounds – Molecules of Pharmaceutical Promise: A Critical Overview
TLDR
In this article, natural distribution of stevioside and related compounds, their structural features, plausible biosynthetic pathways along with an insight into the structure–sweetness relationship are presented.
Isolation and NMR spectral assignments of an ent-kaurane glycoside rebaudioside F, a sweet principle of Stevia rebaudiana.
The complete 1 H and 13 C NMR assignments for the diterpene glycoside 13-((2-O-β-D-xylopyranosyl-3-O- - D-glucopyranosyl-β-D-glucopyranosyl)oxy)-ent-kaur-16-en-19-oic acid β-D-glucopyranosyl ester
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References

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Application of 13C NMR Spectroscopy to Chemistry of Natural Glycosides : Rebaudioside-C, a New Sweet Diterpene Glycoside of Stevia rebaudiana
From leaves of Stevia rebaudiana BERTONI (Compositae), there were isolated three new sweet glycosides, named rebaudioside-C, -D, and -E. Application of 13C NMR spectroscopy as well as chemical
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The purpose of this review is to summarize the existing agricultural, chemical and biochemical literature to provide a baseline for new research on stevia sweeteners.
Genetic control of rebaudioside A and C concentration in leaves of the sweet herb, Stevia rebaudiana
TLDR
A study using F2 population from crosses between two sets of parents with divergent glycoside profiles suggests that both rebaudioside A and C are synthesized by the same enzyme.
Heritability for yield, leaf:stem ratio and stevioside content estimated from a landrace cultivar of Stevia rebaudiana
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Results show that improvement of stevia through selection is possible and that it has potential for production in southwestern Ontario, and response to selection, low-calorie sweetener.