salicylates and phenylacetaldehyde

In field trapping tests, the catch of Chrysoperla carnea sensu lato (Neuroptera: Chrysopidae) increased when acetic acid was added to lures with phenylacetaldehyde. The addition of methyl salicylate to the binary mixture of phenylacetaldehyde plus acetic acid increased catches even further. The ternary blend proved to be more attractive than beta-caryophyllene, 2-phenylethanol, or 3-methyl eugenol (compounds previously described as attractants for chrysopids) on their own, and no influence on catches was recorded when these compounds were added as fourth components to the ternary blend. There were minimal changes in activity when (E)-cinnamaldehyde or methyl anthranylate (both evoking large responses from female or male antennae of C. carnea in this study) were added, although both compounds showed significant attraction on their own when compared to unbaited traps. In subtractive field bioassays with the ternary mixture, it appeared that the presence of either phenylacetaldehyde or methyl salicylate was important, whereas acetic acid was less so in the ternary mixture. The ternary blend attracted both female and male lacewings at sites in southern, central, and northern Europe. Possible applications of a synthetic attractant for lacewings are discussed.

Topics: Acetaldehyde; Acetic Acid; Animals; Female; Insect Control; Insecta; Male; Salicylates; Sex Attractants

An assay for testing the binding of haptens to antigen-presenting cells was developed. The test consists of consecutive incubation of macrophages with the tested hapten, followed by incubation with a radioactively labeled standard. If the first hapten occupies a certain number of binding sites, the other one (radioactively labeled standard) reveals reduced binding. The binding assay in the present modification is fully suitable for measuring the binding of water-soluble haptens. It was found that from a panel of tested haptens, DNFB, beta-bromostyrol and phenylacetaldehyde exhibit strong binding.

Topics: Acetaldehyde; Aldehydes; Animals; Binding, Competitive; Camphor; Coumarins; Dinitrofluorobenzene; Ethanol; Female; Guinea Pigs; Macrophages; Radioligand Assay; Receptors, Antigen; Salicylates; Styrenes; Surface-Active Agents