Contact Toxicity Effects of Selected Organic Leaf Extracts of Tithonia diversifolia (Hemsl.) A. Gray and Vernonia lasiopus (O. Hoffman) against Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae)
Table 3
Phytochemical analysis of insecticidal compounds in the ethyl acetate leaf extracts of T. diversifolia and V. lasiopus.
Compound name
Chemical class
Molecular formula
T. diversifolia
V. lasiopus
RT
Conc. (ng/g)
RT
Conc. (ng/g)
Nonanoic acid
FAD
C9H18O2
15.34
008.05
—
—
Squalene
TT
C30H50
—
—
30.84
122.41
α-Pinene
MT
C10H16
—
—
09.59
004.53
Methyl linoleate
FAD
C19H34O2
25.18
370.28
25.13
121.30
Phytol
DT
C20H40O
24.97
321.37
24.95
060.40
Phytol acetate
DT
C22H42O2
25.90
087.95
22.28
233.70
Sabinene
MT
C10H18O
—
—
12.25
004.57
Eugenol
P
C10H12O2
16.68
016.89
—
—
Coryophyllene
ST
C15H24O
19.65
019.33
19.65
011.87
Linalool
MT
C10H18O
—
—
12.79
007.58
Limonene
MT
C10H16
—
—
11.55
005.06
Citronellel
FAD
C14H26O2
22.54
116.29
—
—
Terpinen-4-ol
MT
C10H18O0
14.08
006.58
14.08
005.84
L-α-terpineol
MT
C14H22
14.29
003.47
—
—
P stands for phenolic, ST for sesquiterpenoid, TT for triterpenoid, DT for diterpenoid, MT for monoterpenoid, S for phytosterol, AD for aldehyde, and FAD for fatty acid derivatives. Figures in parenthesis indicate retention time (RT).
