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- W2067804956 abstract "Incorporation of chlorpyrifos into starch matrices was achieved by thermal gelatinization. The level of amylose content in the starch matrices (10 and 52%) and the addition of auxiliary agents, i.e. solvent, emulsifiers or both, were varied and eight different formulations were prepared. According to differential scanning calorimetry (DSC) and X-ray diffraction measurements, chlorpyrifos was partly present in a crystalline form in all the starch formulations. The formulations had controlled release properties, and the release rate into water could be described by a linear model. In a bioassay, the formulations killed all larvae of the cabbage root fly at a dosing of 1.4 kg a.i. per ha. The degradation of chlorpyrifos in soil from the starch formulations could be described in a non-linear logistic model and the half-life was predicted to be 88 days. Differences in the amount of amylose in the starch as well as the addition of solvent and emulsifiers in the preparation procedure had no systematic influence on the release rate, the insecticidal effect and the degradation rate. No correlation between release rate into water and degradation in soil could be established. Two commercial chlorpyrifos formulations Lorsban 15 G (granular) and Cyfos 500 gl(-1) (emulsifiable concentrate), were included in the study for comparison." @default.
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- W2067804956 date "2002-01-01" @default.
- W2067804956 modified "2023-10-03" @default.
- W2067804956 title "Starch-encapsulated chlorpyrifos: release rate, insecticidal activity and degradation in soil" @default.
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- W2067804956 doi "https://doi.org/10.1080/02652040110105364" @default.
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