Stable, controlled-release organophosphorous pesticides entrapped in β-cyclodextrin I.: Solid state characteristics

The molecular encapsulation of selected volatile organophosphorous pesticides (Malathion, DDVP, Sumithion, Chlorpyriphos, and Sulprofos) results in the improvement of the solid state properties such as flowability, wettability, and thermal stability. Detailed themoanalytical data indicate that the formulations in dry solid state effectively preserve their entrapped pesticide content even at elevated temperature. The dissolution of the cyclodextrin-entrapped pesticides was found to greatly surpass that of the corresponding starch-adsorbates. The molecular entrapment of the studied organophosphorous pesticides moreover provided a method to significantly mask the unpleasant pesticide odour, enabling their indoor uses.