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Anthelmintic flavonoids and other compounds from Combretum glutinosum Perr. ex DC (Combretaceae) leaves
Nine known compounds have been isolated from Combretum glutinosum leaves, including flavonoids and triterpenes. The crystal structures of umuhengerin and (20 S ,24 R )-ocotillone are reported for the first time; the latter structure confirms the absolute configuration. The crude extracts and the is...
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| Published in: | Acta crystallographica. Section C, Structural chemistry Structural chemistry, 2021-09, Vol.77 (Pt 9), p.505-512 |
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| Main Authors: | , , , , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Nine known compounds have been isolated from
Combretum glutinosum
leaves, including flavonoids and triterpenes. The crystal structures of umuhengerin and (20
S
,24
R
)-ocotillone are reported for the first time; the latter structure confirms the absolute configuration. The crude extracts and the isolated compounds were tested for their anthelmintic activity on the larvae and adult worms of
Haemonchus contortus
. The best activity on both stages of the parasite was obtained with the flavonoids.
A chemical study of the hydro-ethanol extract of the leaves of
Combretum glutinosum
resulted in the isolation of nine compounds, including 5-demethylsinensetin (
1
), umuhengerin (
2
), (20
S
,24
R
)-ocotillone (
3
), lupeol (
4
), β-sitosterol (
5
), oleanolic acid (
6
), betulinic acid (
7
), corymbosin (
8
) and β-sitosterol glucoside (
9
). Four compounds have been isolated for the first time from the genus
Combretum
[
viz.
(
1
), (
2
), (
3
) and (
8
)]. The crystal structures of flavonoid (
2
), C
20
H
20
O
8
,
Z
′ = 2, and triterpene (
3
), C
30
H
50
O
3
,
Z
′ = 1, have been determined for the first time; the latter confirmed the absolute configuration of native (20
S
,24
R
)-ocotillone previously derived from the crystal structures of related derivatives. The molecules of (
3
) are linked into supramolecular chains by intermolecular O—H⋯O hydrogen bonds. The crude extracts obtained by aqueous decoction and hydro-ethanolic maceration, as well as the nine isolated compounds, were tested for their anthelmintic activity on the larvae and adult worms of
Haemonchus contortus
, a hematophage that causes parasitic disorders in small ruminants. The evaluated anthelmintic activity showed that the extracts at different doses, as well as all the compounds tested at 150 µg ml
−1
, inhibited the migration of the larvae and the motility of the adult worms of the parasite compared with the phosphate buffer solution negative reference control. The best activity was obtained with flavonoids (
1
), (
2
) and (
8
) on both stages of the parasite. The flavones that showed good activity can be used for the further development of other derivatives, which could increase the anthelmintic efficacy. |
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| ISSN: | 2053-2296 |
| DOI: | 10.1107/S2053229621007841 |