Gymnemoside-f

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Taxonomy: Physicochemical and Pharmacological Properties of Triterpene Glycosides – Glycosides of Aglycones of Oleanene Type – 3β,16β,23,28-Tetrahydroxy-olean-18-ene

Biological source: Gymnema sylvestre [1]

C59H98O28: 1254.624

Mp: 201.3–203.2°C (aq. MeOH) [1]

[α]D26 − 8.9° (c 0.1, MeOH) [1]

IR (KBr) νmax cm−1: 3431, 1044 [1]

FAB-MS (negative ion mode) m/z: 1253.6167 (M-H) [1]

FAB-MS (positive ion mode) m/z: 1277 (M + Na)+ [1]

1H NMR (J/Hz, C5D5N): 0.76, 0.87, 0.96, 0.99, 1.06, 1.08 (s, CH3-27, 25, 24, 29, 30, 26), 1.72 (m), 2.34 (dd-like, H2-15), 1.92, 2.45 (m, H2-22), 2.55 (dd-like, H-13), 3.82 (m, H-16), 3.90 (m, H2-28), 4.15 (m, H2-23), 4.19 (m, H-3), 4.82 (d, J = 7.6, H-1 of Glc″), 4.86 (d, J = 7.9, H-1 of Glc), 4.92 (d, J = 7.3, H-1 of Xyl), 4.99 (d, J = 7.6, H-1 of Glc′), 5.00 (d, J = 7.9, H-1 of Glc″′), 5.25 (brs, H-19) [1]

13 C NMR (68 MHz, C 5D 5N): [ 1]

Table 1

C-1

39.0

C-16

75.9

Glc-1

104.9

Glc″-1

105.7

2

27.5

17

44.4

2

75.0

2

74.6

3

73.0

18

139.5

3

78.5

References

  1. 1.
    M. Yoshikawa, T. Murakami, H. Matsuda, Chem. Pharm. Bull. 45(12), 2034 (1997)CrossRefGoogle Scholar

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