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Biocompatible colloidal dispersions as potential formulations of natural pyrethrins: a structural and efficacy study
Institute of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, Athens, Greece; MTM Research Center, School of Science and Technology, Örebro University, Örebro, Sweden.
Benaki Phytopathological Institute, Kifissia, Attica, Greece.
Benaki Phytopathological Institute, Kifissia, Attica, Greece.
VIORYL S.A., Afidnes, Greece.
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2015 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 31, no 21, 5722-5730 p.Article in journal (Refereed) Published
Abstract [en]

Biocompatible colloidal dispersions the micro- and nanoemulsion type-based on lemon oil terpenes polysorbates, water and glycerol were used for the formulation of pyrethrins, botanical insecticides derived from the white pyrethrum daisy, Tanacetum cinerariifolium. The proposed formulation is based on pyrethrin-containing (W/O) microemulsions that could be diluted in one step with an aqueous phase to obtain kinetically stable oil-in-water (O/W) nanoemulsions. Structural characteristics of the micro- and nanoemulsions were evaluated by electron paramagnetic resonance (EPR) spectroscopy, dynamic light scattering (DLS), small angle X-ray scattering (SAXS), and electrical, conductivity: Dynamic properties of the surfactant monolayer as evidenced by EPR measurements were affected by the water content, the surfactant, and also the presence of the biocide DLS and SAXS experiments of the nanoemulsions indicated the existence of two populations of oil drop-lets dispersed in the aqueous phase, globular droplets of 36-37 nm in diameter, and also larger droplets with diameter's >150 nm. All of the applied techniques for structural determination revealed the participation of the biocide in the nanostructure. The insecticidal effect of the encapsulated natural pyrethrin was evaluated in laboratory bioassays upon a target-insect pest, the cotton aphid Aphis gossypii Glover (Hemiptera: Aphididae) in eggplant, and was found to be increased compared to the commercial pyrethrin formulation.

Place, publisher, year, edition, pages
2015. Vol. 31, no 21, 5722-5730 p.
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-45299DOI: 10.1021/acs.langmuir.5b00246ISI: 000355779300004PubMedID: 25946579Scopus ID: 2-s2.0-84930658833OAI: oai:DiVA.org:oru-45299DiVA: diva2:842806
Note

Funding Agencies:

Greek Secretary of Research Technology

VIORYL S.A., Greece 09-SigmaYN -42-699

STSM, COST, Action CM 1101

Available from: 2015-07-22 Created: 2015-07-20 Last updated: 2015-07-22Bibliographically approved

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