Antimicrobial Activity of Croton macrostachyus Stem Bark Extracts against Several Human Pathogenic Bacteria

Table 3

NMR analysis of the ethyl acetate extract from C. macrostachyus stem bark¹. Chemical shifts of the numbered carbon atoms are shown. Numbering of the carbon atoms used is that of triterpene framework.

Carbon number	Sample (ppm)	Lupeol (ppm)
28	18.22	17.97
20	151.20	150.88
29	109.54	109.31
3	79.23	78.94
17	43.22	42.95
5	55.51	55.25
9	50.65	50.38
19	48.20	47.94
18	48.51	48.24
14	43.04	42.78
8	41.04	40.78
4	39.07	38.81
1	38.92	38.67
13	38.26	38.00
22	40.20	39.96
7	34.49	34.23
16	35.80	35.54
15	27.66	27.41
21	30.06	29.80
23	28.20	27.95
2	27.62	27.35
10	37.38	37.11
12	25.35	25.08
11	21.14	20.89
30	19.52	19.28
6	18.50	18.28
26	16.19	15.94
25	16.33	16.09
24	15.59	15.35
27	14.76	14.51

Obtained on a Bruker Avance AV400 spectrometer and referenced to the solvent peak (CDCl₃ at 77.00 ppm).