Volume 21, Issue 6 p. 1724-1730
Formulation and Engineering of Biomaterials

Bioengineering of a Cellulosic Fabric for Insecticide Delivery via Grafted Cyclodextrin

Roberto Romi

Roberto Romi

Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Roma, Italy

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Pierandrea Lo Nostro

Corresponding Author

Pierandrea Lo Nostro

Department of Chemistry & CSGI, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy

Department of Chemistry & CSGI, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy. Fax: +39 055 457–3036===Search for more papers by this author
Eugenio Bocci

Eugenio Bocci

Department of Chemistry & CSGI, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy

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Francesca Ridi

Francesca Ridi

Department of Chemistry & CSGI, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy

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Piero Baglioni

Piero Baglioni

Department of Chemistry & CSGI, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy

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First published: 05 September 2008
Citations: 58

Abstract

β-Cyclodextrin (β-CD) can be easily grafted onto cellulosic textiles through covalent bonds. In such a way β-CD empty cavities provide an efficient tool for entrapping different kinds of hydrophobic molecules on the surface of the fabric and releasing them slowly in time. The capability of cyclodextrins to include hydrophobic molecules such as fragrances, antimicrobial agents, and other chemicals can be then exploited to produce new grafted textiles with peculiar and useful performances. In this work we report the inclusion of two different products, the pyrethroid insecticide permethrin (PERM) and the insect repellent N,N-diethyl-m-toluamide (DEET), into β-CD molecules grafted on cotton fabric. UV-vis spectrophotometry and thermal analysis confirmed the presence of the guest molecules on the fabric surface. Bioassays were carried out on two mosquito species of medical importance, Aedes aegypti and Anopheles stephensi; knock down effect and mortality were measured using standard World Health Organization (WHO) cone tests. Repellency and irritancy (blood feeding inhibition) were also measured using cage tests and a baited tunnel device. PERM-treated fabrics kept the insecticidal/irritant efficacy even for a long time after the treatment, whereas DEET activity lasted more shortly.