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Ginkgolide B
Ginkgolide B
【Structural formula】
[Molecular formula and molecular weight] C 20 H 24 O 10 ; 424.
[Source] Ginkgo biloba L.
【Properties】White powder
This product is easily soluble in methanol and acetone , but insoluble in water
Melting point: It turns yellow and decomposes above 300℃
【Purity Check】
TLC
1.
Developing solvent cyclohexane - acetone - methanol (2.
After checking the color development of acetic anhydride vapor, check under UV light (365nm)
2.
Developing agent toluene- ethyl acetate -acetone-methanol (5:2.
After checking the color development of acetic anhydride vapor, check under UV light (365nm)
High performance liquid chromatography
Chromatographic column Platinum C 18 , 5um (4.
Mobile phase methanol-water (27:73), 1ml/min
ELSD 2000ES evaporative light scattering detection, nitrogen flow rate: 2.
【Structural identification】217
3452(-OH), 2970, 1793, 1780 (C=O), 1360, 1246, 1176, 1132, 1093, 1070, 945
EI-MS m/z: 424[M] +
1 H-NMR (DMSO) δ: 1.
13 C-NMR (DMSO) δ: 73.
7(C-1), 91.
8(C-2), 82.
8(C-3), 98.
4(C-4), 71.
6(C-5), 78.
6(C-6) , 36.
5(C-7), 48.
5(C-8), 67.
4(C-9), 69.
0(C-10), 174.
0(C-11), 109.
5(C-12), 170.
2(C-13), 41.
5(C-14), 7.
8(C-16), 31.
9(C-17), 28.
8(C-18, C-19, C-20)
.
【Storage】Dry and airtight
.