Metastable crystalline forms of contact insecticides for faster, lower-exposure pest control
A crystal engineering approach that transforms commercial contact insecticides into metastable yet persistent polymorphic forms to accelerate insect knockdown, reduce active ingredient usage, and counter resistance. Validated on DDT, lindane, and deltamethrin, with demonstrated 12-fold speed gains against Anopheles and Aedes mosquitoes.
Overview
Contact insecticides function at the interface between molecular crystals and whole organisms, making the solid-state properties of crystallites critical to their performance. This research proposes that any crystalline contact insecticide can be made to act more quickly while reducing overall environmental exposure by using it in a metastable yet persistent crystalline form. The approach is grounded in the principle that higher free-energy crystal phases release active molecules more readily at biological surfaces.
The team has demonstrated an inverse correlation between crystal thermodynamic stability and insecticidal activity across multiple compounds, including DDT and its congeners, lindane, and deltamethrin. In a recent peer-reviewed publication, heating commercial deltamethrin crystals (Form I) for minutes in a bath or microwave transformed them into Form II, which killed Anopheles and Aedes mosquitoes 12 times faster, effectively bypassing established resistance mechanisms.
Technical specifications
Core approach:
- Systematic chemical crystallography analysis of contact insecticides to identify metastable polymorphs
- Controlled phase transformation using simple thermal methods (oil bath or microwave heating)
- Generation of faster-acting crystal forms that maintain sufficient persistence for field use
Validated results:
- DDT and congeners: inverse correlation between thermodynamic stability and activity confirmed
- Lindane: same stability-activity relationship established
- Deltamethrin Form II: 12-fold increase in speed against Anopheles and Aedes mosquitoes compared to commercial Form I
Proposed extensions:
- Cyfluthrin (WHO-approved for indoor residual spraying)
- Imidacloprid (a widely used commercial insecticide active ingredient)
- Methodology is generalizable to any crystalline contact insecticide
Technology readiness level
The deltamethrin polymorph transformation has been published in a peer-reviewed journal and demonstrated efficacy against resistant mosquito populations. The approach uses straightforward thermal processing amenable to scaling. The proposed extension to cyfluthrin and imidacloprid represents the next validation phase, building on a proven methodology. This technology is positioned for sponsored research collaboration, co-development with agrochemical companies, or licensing of the polymorph-discovery methodology and specific crystal form IP for commercial insecticide products.
About New York University
New York University is a comprehensive private research university anchored in New York City, enrolling a large, diverse student body and operating a global network of campuses. Corporate engagement is enabled by co‑located engineering and computing hubs in Brooklyn and Manhattan with shared labs and facilities for prototyping and field pilots. Integration with a major hospital system supports clinical translation, IRB processes, and access to real‑world data under stringent governance. Proximity to leading industries and a mature sponsored‑research function streamline scoping, NDAs, MSAs, and talent pipelines. Research is supported by competitive federal funding from agencies such as NIH, NSF, DOE, and DOD, and a dedicated technology transfer office manages IP, licensing, and startup creation.
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