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Am. J. Trop. Med. Hyg., 77(1), 2007, pp. 52-57
Copyright © 2007 by The American Society of Tropical Medicine and Hygiene

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N, N-diethyl-m-toluamide–Containing Microcapsules for Bio-Cloth Finishing

Bin Fei AND John H. Xin*
Institute of Textiles and Clothing, Hong Kong Polytechnic University, Hung Hom, Hong Kong

To obtain long-duration protection from mosquitoes using insect repellent N, N-diethyl-m-toluamide (DEET), this compound was incapsulated in situ during the graft copolymerization of butyl acrylate onto chitosan in an aqueous solution. Morphology of microcapsules was characterized by scanning electron microscopy, scanning probe microscopy, and transmission electron microscopy. This morphology supported successful encapsulation of DEET into polymer capsules. The encapsulation ratio of DEET was greater than 33%, as estimated from thermo-gravimetric results. The aqueous emulsions were applied to cotton textiles by spraying. Treated cloth showed high bactericidal activity against Staphylococcus aureus. Mosquito repellency of the bio-cloth was evaluated with Aedes albopictus. The 90% effective dose of emulsions on textiles was compared with that of DEET in ethanol. A time profile showed that the repellency of an optimized emulsion was 100% after eight hours, and partially preserved even after exposure to air for 48 hours.

Received September 29, 2006. Accepted for publication February 21, 2007.

Acknowledgment: We thank Chao Chen (Military Medical Institute of Nanjing Command, Nanjing, People’s Republic of China) for help with the insect test.

Financial support: This study was supported by Innovative Technology Funding ZP53 from the Hong Kong Special Administrative Region government and by the postdoctoral fellowship G-YX41 from the Hong Kong Polytechnic University.

* Address correspondence to John H. Xin, Institute of Textiles and Clothing, Hong Kong Polytechnic University, Hung Hom, Hong Kong, Special Administrative Region, People’s Republic of China. E-mail: tcxinjh{at}inet.polyu.edu.hk

Authors’ address: Bin Fei and John H. Xin, Institute of Textiles and Clothing, Hong Kong Polytechnic University, Hung Hom, Hong Kong, Special Administrative Region, People’s Republic of China, Telephone, 852-2766-6474, Fax: 852-2773-1432, E-mail: tcxinjh{at}inet.polyu.edu.hk.




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 Textile Research JournalHome page
F. Salaun, E. Devaux, S. Bourbigot, and P. Rumeau
Application of Contact Angle Measurement to the Manufacture of Textiles Containing Microcapsules
Textile Research Journal, September 1, 2009; 79(13): 1202 - 1212.
[Abstract] [PDF]


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Copyright © 2007 by the American Society of Tropical Medicine and Hygiene.