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    Eco-friendly thermosensitive magnetic-molecularly-imprinted polymer adsorbent in dispersive solid-phase microextraction for gas chromatographic determination of organophosphorus pesticides in fruit samples
    (2024-01-01)
    Seebunrueng, Ketsarin
    ;
    Tamuang, Suparb
    ;
    Jarujamrus, Purim
    ;
    Saengsuwan, Sayant
    ;
    Patdhanagul, Nopbhasinthu
    A thermosensitive magnetic-molecularly-imprinted polymer (TMMIP) was successfully prepared in an aqueous medium. The TMMIP was applied as an effective adsorbent in dispersive solid-phase microextraction for the selective enrichment of five organophosphorus pesticides (OPPs; diazinon, fenitrothion, fenthion, parathion-ethyl, and ethion) before analysis by gas chromatography. The polymerization was performed using mixed-valence iron hydroxide nanoparticles as the magnetic support, N-isopropyl acrylamide as the thermosensitive monomer, ethion as the template, and methacrylic acid as the functional monomer. The adsorption and desorption mechanisms of OPPs depend on their interactions with the adsorbents and solution temperature. Our methodology provides good linearity (0.50–2000 µg L<sup>-1</sup>), with a correlation determination of R<sup>2</sup> > 0.9980, low limit of detection (0.25–0.50 µg L<sup>-1</sup>), low limit of quantitation (0.50–1.50 μg L<sup>−1</sup>), and high precision (%RSD < 7%). The developed method demonstrates excellent applicability for accurately and efficiently determining OPP residuals in fruit and vegetable samples with good recoveries (93–117%).
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    Insecticidal effect of plant essential oil nanoemulsions on controlling Spodoptera exigua
    (2023-03-01)
    Passara, H.
    ;
    Pumnaun, J.
    ;
    Thipmanee, K.
    The results showed that Curcuma longa and Illicium verum nEOs performed extremely high mortality and antifeedant activity, as well as affected on growth development of Spodoptera exigua. Essential oil nanoemulsions at 0.35 % concentrations caused 100% mortality, 100% antifeedant activity, and 100% growth inhibition. Curcuma longa and Illicium verum nEOs revealed to be used as botanical insecticide for controlling Spodoptera exigua.
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    Effects of seven plant essential oils on mortalities of chicken lice (Lipeurus caponis l.) adult
    (2020-01-01)
    Pumnuan, Jarongsak
    ;
    Insung, Ammorn
    ;
    Klompanya, Ampon
    Chicken lice (Lipeurus caponis L.) are external parasite of chicken and farmers often use malathion and carbaryl insecticides to control this parasite. However, the use of chemical insecticides may result in direct toxicity to chicken or contamination in chicken meats. Thus, this study investigated the effect of seven plant essential oils (EOs) against adult chicken lice. Contact bioassay was performed by laying 10 adult chicken lice on treated filter paper added with EOs at concentrations of 0 (95% ethanol as a control), 0.079, 0.157, 0.236 and 0.314 μl·cm<sup>-2</sup>. Mortality percentages were observed at 3, 6 and 12 h intervals after the treatments. Clove, cinnamon, turmeric and star anise EOs were able to eliminate the lice completely (100% mortalities) at 12 h exposure which were higher than lemon grass, citronella grass and piper EOs. Clove EO was the most effective oil with LC<inf>50</inf> of 0.132, 0.085 and 0.039 μl·cm<sup>-2</sup> at 3, 6 and 12 h, respectively. Furthermore, clove EO at the 0.157 μl·cm<sup>-2</sup> showed the highest mortalities with LT<inf>50</inf> at 1.438 h. Our study suggests that clove EO could be used as an alternative medicinal insecticide to control chicken lice in farms.
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