Bioactivity-Guided Single-Step Isolation of Stachyspinoside from Sideritis congesta by Centrifugal Partition Chromatography
Table 4
Quantification of five main peaks in fraction III.
Peak no.
(min)
Content (%)
MS analysis [M+H]+
Molecular formula
NMR analysis
Identified compound
Detected mass (m/z)
MW (g/mol)
Error (ppm)
1
37.1
45.2
303.23208
302
0.736
C20H31O2
C22H34O4
Linearol
2
38.3
19.2
303.23163
302
−0.748
C20H31O2
Isomer of peak 1
Isomer of peak 1
3
48.4
11.3
NMR indicates a mixture of kaurene compounds
4
49.8
16.8
NMR indicates a mixture of kaurene compounds
5
50.1
4.4
326.23160 possibly: [M + NH4]+
304
-3.019
C18H32O4N
C20H32O2
Epicandicandiol
Peak 2 showed a main compound in the HRMS analysis with the same observed molar weight as peak 1. The structural identification was achieved with 1H-,13C-NMR, and HRMS (see Appendix).
