Composition of the Essential Oil and Insecticidal Activity of <i>Launaea taraxacifolia</i> (Willd.) Amin ex C. Jeffrey Growing in Nigeria
The rice weevil (<i>Sitophilus oryzae</i>) is a pest of stored grain products such as rice, wheat, and corn. Essential oils represent a green environmentally-friendly alternative to synthetic pesticides for controlling stored-product insect pests. <i>Launaea taraxacifolia</i>...
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MDPI AG
2020-07-01
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| Series: | Foods |
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| Online Access: | https://www.mdpi.com/2304-8158/9/7/914 |
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| author | Moses S. Owolabi Akintayo L. Ogundajo Azeezat O. Alafia Kafayat O. Ajelara William N. Setzer |
| author_facet | Moses S. Owolabi Akintayo L. Ogundajo Azeezat O. Alafia Kafayat O. Ajelara William N. Setzer |
| author_sort | Moses S. Owolabi |
| collection | DOAJ |
| description | The rice weevil (<i>Sitophilus oryzae</i>) is a pest of stored grain products such as rice, wheat, and corn. Essential oils represent a green environmentally-friendly alternative to synthetic pesticides for controlling stored-product insect pests. <i>Launaea taraxacifolia</i> is a leafy vegetable plant found in several parts of Nigeria. The leaves are eaten either fresh as a salad or cooked as a sauce. The essential oil obtained from fresh leaves of <i>L. taraxacifolia</i> was obtained by hydrodistillation and analyzed by gas chromatography/mass spectrometry (GC-MS). Twenty-nine compounds were identified, accounting for 100% of the oil composition. The major component classes were monoterpene hydrocarbons (78.1%), followed by oxygenated monoterpenoids (16.2%), sesquiterpene hydrocarbons (2.1%), oxygenated sesquiterpenoids (0.3%), and non-terpenoid derivatives (3.3%). The leaf essential oil was dominated by monoterpene hydrocarbons including limonene (48.8%), sabinene (18.8%), and (<i>E</i>)-β-ocimene (4.6%), along with the monoterpenoid aldehyde citronellal (11.0%). The contact insecticidal activity of <i>L. taraxacifolia</i> essential oil against <i>Sitophilus oryzae</i> was carried out; median lethal concentration (LC<sub>50</sub>) values of topical exposure of <i>L. taraxacifolia</i> essential oil were assessed over a 120-h period. The LC<sub>50</sub> values ranged from 54.38 μL/mL (24 h) to 10.10 µL/mL (120 h). The insecticidal activity of the <i>L. taraxacifolia</i> essential oil can be attributed to major components limonene (48.8%), sabinene (18.8%), and citronellal (11.0%), as well as potential synergistic action of the essential oil components. This result showed <i>L. taraxacifolia</i> essential oil may be considered as a useful alternative to synthetic insecticides. |
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| issn | 2304-8158 |
| language | English |
| last_indexed | 2024-03-10T18:32:37Z |
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| spelling | doaj.art-648c4f5387be4df28f959402fe8996f92023-11-20T06:29:10ZengMDPI AGFoods2304-81582020-07-019791410.3390/foods9070914Composition of the Essential Oil and Insecticidal Activity of <i>Launaea taraxacifolia</i> (Willd.) Amin ex C. Jeffrey Growing in NigeriaMoses S. Owolabi0Akintayo L. Ogundajo1Azeezat O. Alafia2Kafayat O. Ajelara3William N. Setzer4Department of Chemistry, Lagos State University, P.M.B. 001, LASU, Lagos 102001, NigeriaDepartment of Chemistry, Lagos State University, P.M.B. 001, LASU, Lagos 102001, NigeriaDepartment of Zoology and Environmental Biology, Lagos State University, P.M.B. 001, LASU, Lagos 102001, NigeriaDepartment of Zoology and Environmental Biology, Lagos State University, P.M.B. 001, LASU, Lagos 102001, NigeriaDepartment of Chemistry, University of Alabama in Huntsville, Huntsville, AL 35899, USAThe rice weevil (<i>Sitophilus oryzae</i>) is a pest of stored grain products such as rice, wheat, and corn. Essential oils represent a green environmentally-friendly alternative to synthetic pesticides for controlling stored-product insect pests. <i>Launaea taraxacifolia</i> is a leafy vegetable plant found in several parts of Nigeria. The leaves are eaten either fresh as a salad or cooked as a sauce. The essential oil obtained from fresh leaves of <i>L. taraxacifolia</i> was obtained by hydrodistillation and analyzed by gas chromatography/mass spectrometry (GC-MS). Twenty-nine compounds were identified, accounting for 100% of the oil composition. The major component classes were monoterpene hydrocarbons (78.1%), followed by oxygenated monoterpenoids (16.2%), sesquiterpene hydrocarbons (2.1%), oxygenated sesquiterpenoids (0.3%), and non-terpenoid derivatives (3.3%). The leaf essential oil was dominated by monoterpene hydrocarbons including limonene (48.8%), sabinene (18.8%), and (<i>E</i>)-β-ocimene (4.6%), along with the monoterpenoid aldehyde citronellal (11.0%). The contact insecticidal activity of <i>L. taraxacifolia</i> essential oil against <i>Sitophilus oryzae</i> was carried out; median lethal concentration (LC<sub>50</sub>) values of topical exposure of <i>L. taraxacifolia</i> essential oil were assessed over a 120-h period. The LC<sub>50</sub> values ranged from 54.38 μL/mL (24 h) to 10.10 µL/mL (120 h). The insecticidal activity of the <i>L. taraxacifolia</i> essential oil can be attributed to major components limonene (48.8%), sabinene (18.8%), and citronellal (11.0%), as well as potential synergistic action of the essential oil components. This result showed <i>L. taraxacifolia</i> essential oil may be considered as a useful alternative to synthetic insecticides.https://www.mdpi.com/2304-8158/9/7/914essential oil compositionlimonenesabinenecitronellal<i>Sitophilus oryzae</i> |
| spellingShingle | Moses S. Owolabi Akintayo L. Ogundajo Azeezat O. Alafia Kafayat O. Ajelara William N. Setzer Composition of the Essential Oil and Insecticidal Activity of <i>Launaea taraxacifolia</i> (Willd.) Amin ex C. Jeffrey Growing in Nigeria Foods essential oil composition limonene sabinene citronellal <i>Sitophilus oryzae</i> |
| title | Composition of the Essential Oil and Insecticidal Activity of <i>Launaea taraxacifolia</i> (Willd.) Amin ex C. Jeffrey Growing in Nigeria |
| title_full | Composition of the Essential Oil and Insecticidal Activity of <i>Launaea taraxacifolia</i> (Willd.) Amin ex C. Jeffrey Growing in Nigeria |
| title_fullStr | Composition of the Essential Oil and Insecticidal Activity of <i>Launaea taraxacifolia</i> (Willd.) Amin ex C. Jeffrey Growing in Nigeria |
| title_full_unstemmed | Composition of the Essential Oil and Insecticidal Activity of <i>Launaea taraxacifolia</i> (Willd.) Amin ex C. Jeffrey Growing in Nigeria |
| title_short | Composition of the Essential Oil and Insecticidal Activity of <i>Launaea taraxacifolia</i> (Willd.) Amin ex C. Jeffrey Growing in Nigeria |
| title_sort | composition of the essential oil and insecticidal activity of i launaea taraxacifolia i willd amin ex c jeffrey growing in nigeria |
| topic | essential oil composition limonene sabinene citronellal <i>Sitophilus oryzae</i> |
| url | https://www.mdpi.com/2304-8158/9/7/914 |
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