Molluscicidal and parasiticidal activities of Eryngium triquetrum essential oil on Schistosoma mansoni and its intermediate snail host Biomphalaria glabrata, a double impact

Table 2 Percentage of different fractions of Eryngium triquetrum essential oil from three distinct geographical localities in Algeria

No	Components^a	RI ^b_a	Eryngium triquetrum
No	Components^a	RI ^b_a	ET01^c	ET02^c	ET03^c	Identification
1	Heptane	703	0.2	0.1	0.1	RI, MS
2	Hexanal	774	0.2	0.2	0.2	RI, MS
3	Heptanal	877	tr	tr	tr	RI, MS
4	Octanal	979	1.8	1.0	1.0	RI, MS
5	(E)-2-octenal	1039	tr	tr	tr	RI, MS
6	1-octanol	1063	0.3	0.1	0.1	RI, MS
7	Nonan-2-one	1077	tr	0.1	0.1	RI, MS
8	Nonanal	1081	0.4	0.2	0.3	RI, MS
9	(E)-2-nonenal	1133	0.4	0.3	0.2	RI, MS
10	(Z)-2-nonen-1-ol	1155	0.1	0.4	0.4	RI, MS
11	Octanoic acid	1174	0.1	tr	tr	RI, MS
12	1-decen-3-ol	1181	0.6	tr	tr	RI, MS
13	Decanal	1183	tr	0.2	0.2	RI, MS
14	3-dodecen-1-yne	1214	0.1	tr	tr	RI, MS
15	Carvone	1225	tr	tr	tr	RI, MS
16	(E)-2-decanal	1251	tr	0.2	0.2	RI, MS
17	(E,E)-2,4-decadienal	1289	0.3	0.3	0.3	RI, MS
18	β-ionone	1454	0.2	0.2	0.2	RI, MS
19	3,4-dimethyl-5-pentyl-5H-furan-2-one	1486	1.9	1.0	1.0	RI, MS, Ref
20	γ-undecalactone	1524	tr	tr	0.2	RI, MS, Ref
21	Dodecanoic acid	1547	0.1	tr	tr	RI, MS
22	Hexadecanoic acid	1968	1.4	0.8	0.8	RI, MS
23	falcarinol	2026	86.9	93.1	90.6	RI, MS
24	α-kaurene	2049	0.1	0.3	0.2	RI, MS
Total identification (%)			95.1	98.3	96.2
EO yields (%) (w/w)			0.05	0.04	0.03
Oxygenated compounds			92.8	95.4	92.7
Hydrogenated compounds			2.3	2.9	3.5

^aOrder of elution is given on apolar column (SPB-1)
^bRetention indices on SPB-1 column (RI_a)
^cEssential oils of E. triquetrum stems. Quantification was carried out using RFs relative to tridecane as internal standard
Abbreviations: %, normalized percentages are given on the apolar column; tr, trace (< 0.05%); RI: retention index; MS: mass spectrometry in electronic impact mode. All compounds were identified by comparing their EI-MS and retention indices with references compiled in the in-house library except for compounds 19 and 20; EO: essential oil. Yield is based on the fresh weight of the stems; Ref, Compounds identified with references from literature data and compiled in the in-house library

ISSN: 1756-3305