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Evaluation of controlled-release mosquito repellent formulations
L C Rutledge1, R K Gupta, Z A Mehr
1Department of Entomology, Walter Reed Army Institute of Research, Washington, DC 20307-5100, USA.
Journal of the American Mosquito Control Association
|March 1, 1996
Summary
New deet (diethyltoluamide) formulations offer enhanced protection against mosquitoes. Several polymer and microcapsule formulations significantly improved efficacy compared to standard deet, providing longer-lasting repellency for up to 24 hours.
Area of Science:
- Entomology
- Materials Science
- Toxicology
Background:
- Diethyltoluamide (DEET) is a widely used insect repellent.
- Optimizing DEET formulations is crucial for improving repellent efficacy and duration.
- Mosquito-borne diseases necessitate effective and long-lasting personal protection.
Purpose of the Study:
- To evaluate the efficacy of novel polymer and microcapsule formulations of DEET.
- To compare the effectiveness of these formulations against standard DEET against key mosquito species.
- To identify specific formulation components that enhance DEET's repellent activity.
Main Methods:
- Testing of eight polymer and nine microcapsule DEET formulations on laboratory rabbits.
- Exposure of treated rabbits to Aedes aegypti and Anopheles albimanus mosquitoes.
- Assessment of repellent efficacy and duration for each formulation.
Main Results:
- Several polymer and microcapsule DEET formulations demonstrated significantly enhanced efficacy over unformulated DEET.
- Extended protection periods, up to 24 hours, were observed with optimized formulations.
- Top-performing formulations included a polymer-based one with high molecular weight fatty acid and microcapsule formulations incorporating lanolin, gum arabic, gelatin, and other agents.
Conclusions:
- Advanced polymer and microcapsule technologies can substantially improve DEET's repellent performance.
- Specific ingredients within microcapsule formulations, such as lanolin and gelatin, contribute to extended efficacy.
- These enhanced DEET formulations represent a promising advancement in personal protection against mosquito bites.