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Biocompatible nanodispersions as potential formulations of natural pyrethrins: a structural and efficacy study
Örebro University, School of Science and Technology. Institute of Biology, Medicinal Chemistry & Biotechnology, National Hellenic Research Foundation, 48, Vassileos Constantinou Ave., 11635, Athens, Greece. (MTM)
Benaki Phytopathological Institute, 8 St. Delta str.145 61, Kifissia, Attica, Greece.
Benaki Phytopathological Institute, 8 St. Delta str.145 61, Kifissia, Attica, Greece.
Örebro University, School of Science and Technology. (MTM)
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Biocompatible nanodispersions of the micro- and nanoemulsion type based on lemon oil terpenes, polysorbates, water and glycerol were used for the formulation of pyrethrins, natural insecticides derived from the extract of chrysanthemum flower. The proposed pyrethrin containing water-in-oil (w/o) microemulsions could be diluted with aqueous phase to obtain kinetically stable oil-in-water (o/w) nanoemulsions ready to use in sprayers for plant protection. 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 surfactants’ monolayer as evidenced by EPR measurements were affected by the water content, the nature of the surfactant and also the presence of the biocide in both w/o microemulsions and o/w nanoemulsions. DLS and SAXS experiments of the nanoemulsions indicated the existence of two populations of oil droplets dispersed in the aqueous phase, globular droplets of 36-37 nm in diameter and also larger droplets with diameters >150 nm. In addition, all the applied techniques for structural determination revealed participation of the biocide in the nanostructure. The insecticidal effect of the natural pyrethrin nanodispersions was evaluated in laboratory bioassays upon a target-insect pest, the cotton aphid Aphis gossypii Glover (Hemiptera: Aphididae) in eggplant and was found increased compared to the natural pyrethin emulsion. 

National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-35082OAI: oai:DiVA.org:oru-35082DiVA, id: diva2:717997
Note

This work was financed by the Greek Secretary of Research &Technology and VIORYL SA, Greece, within the frame of the commonresearch project “Cooperation”, 09- ΣΥΝ -42-699 and the STSM,COST, Action CM 1101 scientific programme on Colloidal Aspects ofNanoscience for Innovative Processes and Materials.

Available from: 2014-05-19 Created: 2014-05-19 Last updated: 2017-10-17Bibliographically approved
In thesis
1. Biocompatible microemulsions: formulation, encapsulation of bioactive compounds and their potential applications
Open this publication in new window or tab >>Biocompatible microemulsions: formulation, encapsulation of bioactive compounds and their potential applications
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Örebro: Örebro universitet, 2014. p. 82
Series
Örebro Studies in Chemistry, ISSN 1651-4270 ; 14
Keywords
biocompatible microemulsions, encapsulation, pharmaceuticals, methylxanthine, agrochemicals, pyrethrinsfood, squalene, octyl gallate, gallic acid, EPR, DLS, SAXS
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
urn:nbn:se:oru:diva-35059 (URN)978-91-7529-029-4 (ISBN)
Public defence
2014-06-09, Hörsalen, Musikhögskolan, Örebro universitet, Fakultetsgatan 1, 702 81, 09:00 (English)
Opponent
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Available from: 2014-05-15 Created: 2014-05-15 Last updated: 2017-10-17Bibliographically approved

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