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PubMedDate not supplied

[Current situation in Spain of aerosol insect sprays registered for household use by the environmental health authorities].

BACKGROUND: The recent transposition of the Biocides Directive by means of Royal Decree 1054/2002 involves a substantial change in different Environmental Health-related aspects. To assess the impact of these changes, an analysis of the current situation is provided, based on which the consequences of the implementation of this Directive in Spain may be assessed, in addition to setting out the main aspects which must be analyzed with a view to a Biocides Registry being put into place in accordance with the aforementioned Royal Decree. METHODS: The analysis was made based on the data included in the Spanish Ministry of Health and Consumer Affairs related to aerosol insect sprays registered for Household Use. Aerosols were chosen as a result of their being the type most numerous on the market for household use. RESULTS: The formulation of these aerosols includes 25 insecticides, 1 disinfectant and 2 synergizers. A majority of the 298 aerosol insect sprays include some pyretroid in their composition, by itself or combined with some other insecticide, disinfectant and/or synergizing compound. Most of these biocides are a mixture of active substances. CONCLUSIONS: Based on the analysis made, the need of setting out new procedures for assessing the effectiveness of the formulas prepared for the use in question (design of standardized testing protocols, assessment of effectiveness on the different pest species, the effect of the mixture of active ingredients, safety timeframes, ...), in addition to the aspects related to toxicology; ecotoxicology or physicochemical characteristics.

Aerosols↗
PubMedDate not supplied

Pharmacokinetics of 2-ethyl-1,3-hexanediol. II. Nonsystemic disposition following single percutaneous or peroral doses in Fischer 344 rats.

The pharmacokinetics of [1,3-14C]-2-ethyl-1,3-hexanediol (EHD) were investigated following single percutaneous doses of 150 mg/kg, applied to male and female Fischer 344 rats, or single peroral doses of 1.5 or 150 mg EHD/kg given by gavage to male Fischer 344 rats. EHD-derived radioactivity was slowly absorbed through skin and relatively rapidly excreted through the urine in a first-order manner over 48 hr postdosing. Skin penetration of 14C was sufficiently slow that the terminal rate constant for the plasma concentration data had to be derived from the absorption phase of this curve, based on the terminal rate constant for a comparable intravenous dose plasma curve [Frantz et al.: Drug Metab. Dispos. 19, 881 (1991)]. Plasma data from perorally doses rats exhibited dose-linearity over a 1.5-150 mg/kg range, with plasma 14C concentration vs. time plots for oral doses of EHD resembling the iv time-course data. This resulted from a very rapid absorption phase (5.5 min t1/2), with plasma 14C levels for both dose levels decreasing in a biexponential manner. The major route of excretion after peroral doses was in urine, making this mode of excretion consistent for both routes of administration evaluated in this study and including the doses given in previous iv work. Kinetic analysis confirmed that this route of excretion was first-order. HPLC analysis of urine from both routes demonstrated that EHD was metabolized and excreted as at least two major, water-soluble urinary metabolites; these metabolites were not identified in this investigation. No unmetabolized EHD was detected in urine, indicating that EHD may be completely metabolized in the rat. Overall, EHD was absorbed, distributed, metabolized, and eliminated from the Fischer rat in a first-order manner following either cutaneous or peroral doses. The results of this study indicate that the kinetic patterns observed experimentally will be dose-proportional for doses administered in the range of 1.5-150 mg/kg.

Absorption↗
PubMed2003

Operational use of neem oil as an alternative anopheline larvicide. Part A: Laboratory and field efficacy.

We conducted a study to determine the laboratory and field efficacy of neem oil towards anopheline larvae. No difference in LC50 was observed between laboratory and field strains for temephos, chlorpyriphos-methyl/fenitrothion and neem oil. No difference in susceptibility was found after 3 months of application every 2 weeks. Water treated with a single application of traditional larvicides was free of larvae after 4 weeks; neem oil-treated water, however, was free after 2 weeks but not at 4 weeks. Application of chlorpyriphos-methyl/fenitrothion and neem oil every 2 weeks for 7 rounds resulted in dramatic reduction in larval density with no statistically significant differences. An adult survey after larviciding also showed no significant difference. The efficacy of crude neem oil appears to be below that of conventional larvicides.

Animals↗