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Gymnemoside-e

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Taxonomy: Physicochemical and Pharmacological Properties of Triterpene Glycosides – Glycosides of Aglycones of Oleanene Type – 23-Hydroxy-longispinogenin

Biological source: Gymnema sylvestre [1]

C59H98O28: 1254.624

Mp: 202.8–204.1°C (aq. MeOH) [1]

[α]D29 + 14.8° (c 0.1, MeOH) [1]

IR (KBr) νmax cm−1: 3410, 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): 0.89, 1.00, 1.02, 1.23 (s, CH3-29, 24, 26, 27), 0.96 (s, CH3-25, 30), 1.71 (m), 2.76 (dd-like, H2-22), 1.75 (m), 2.19 (dd-like, H2-15), 2.33 (dd-like, H-18), 4.04 (m, H2-23), 4.16 (m, H-3), 4.21 (m, H2-28), 4.51 (dd-like, H-16), 4.81 (d, J = 7.6, H-1 of Glc″), 4.83 (d, J = 6.9, H-1 of Glc), 4.92 (d, J = 7.3, H-1 of Xyl), 5.00 (d, J = 7.9, H-1 of Glc′), 5.03 (d, J = 7.9, H-1 of Glc″′), 5.25 (brs, H-12) [1]

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

Table 1

C-1

38.8

C-16

66.3

Glc-1

104.9

Glc″-1

105.7

2

27.4

17

41.4

2

75.1

2

74.8

3

72.4

18

44.9

References

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

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