DE3733640A1 - Biological insecticide spray containing black pepper oil - Google Patents

Abstract

The invention is based on the object of increasing the activity and the storage stability of pyrethrin as an insecticide spray by means of biological synergists and improved formulation. An insecticide spray formulation is described, characterised in that the formulation consists of a mixture of pyrethrin extract, black pepper oil, additives with or without other ethereal oils and piperonyl butoxide, and is brought into a clear, aqueous emulsion and buffered at a pH of 3.0 to 5.0. An insecticide formulation of this type is readily biodegradable, non-toxic for warm-blooded animals and very stable on storage. It was found that a mixture of pyrethrin and black pepper oil excels the insecticidal action of the two components by far and is highly effective against insects, as was demonstrated by field tests.

Description

This additional application relates to an aqueous, biological Insecticide spray formulation consisting of: pyrethrin extract, Black pepper oil, additives with or without others essential oils and piperonyl butoxide in clear, aqueous Emulsion buffered at pH 3.0 to 5.0.

Such an insecticide formulation is biologically good degradable, non-toxic for warm-blooded animals, very stable in storage and highly effective against insects.

The insecticidal effect of the extract from the flower Chrysanthemum cinerariae folium Vis (synonym, Pyrethrum cinerariae- folium Trev.) has been known for several centuries. Insect sprays with this extract are now in the household worldwide used.

The spray usually comes in a 25% paraffin oil solution Trade. The classic synergist for pyrethrin extracts is Piperonyl butoxide. Sesamin and similar compounds as well Piperine are also used.

Because pyrethrin is relatively unstable and the synergists essential Many attempts have been made to contribute to the insecticidal action undertaken the stability and the synergistic effect of pyrethrin (see patent application P 37 17 467.3).

The additional registration for the above-mentioned The patent application is the Task based on the effectiveness of black pepper oil Increase pyrithrin.

The insecticidal effects of black pepper and its Components are known (see e.g. Su, H.C.F., insecticidal properties of black pepper to rice weevils and cowpea weevils, J. of economic Entomology, vol 70, 18-21, 1977 as well Su, H.C.F. and R. Horwat, isolation, identification and insecticidal properties of piper nigrum amides, J. Agr. Food Chem., Vol 29, 115-118, 1981), the etheric derived therefrom However, oils are commercial for such Use too expensive.

The hot pepper taste is 90-95% due to the trans- Piperine attributed to the fruit in a concentration of 2-5% is included. Accompanying substances are piperitin, Piperolein and piperylin, which taste less spicy and lignans, including Cubebin. Black pepper can by steam distillation about 1-2.5% essential oil  be won. This essential oil consists of about 130 Components, including 95% hydrocarbons (terpene derivatives such as piven, camphene, limonene etc.), 15 alcohols (linalool, Merolidol etc.), 9 aldehydes and ketones (Citronellal, Earvonin) as well as various esters and ethers. Both fruits as oils are also listed in the literature (Hagers Handbuch der Pharm. Praxis, Volume VIA, 697-704, Springer Verlag, 1977; P.H. List and L. Hörhammer).

It is now surprisingly found that a mixture of Pyrethrin and black pepper oil have the insecticidal effects of far exceeds both components. The effect of Mixing can be increased by adding piperonyl butoxide, Turpentine oil, lavender oil and citronell oil, individually or combined. There is nothing for commercial use more in the way, since only small amounts of black pepper oil are used are needed.

The mixture of pyrethrin extract, black pepper oil, piperonyl butoxide, Turpentine oil, lavender oil and citronell oil are included a suitable emulsifier in a clear emulsion. The emulsion is made with a suitable organic acid buffered, in a pH range of 3.0 to 5.0. This formulation shows excellent stability Long-term storage at room temperature.

Exemplary embodiments of the additional application are described below described in more detail.  

example

One after the other, place them in a suitable Cremophor RH 410, Weighed in pyrethrum extract, black pepper oil, piperonyl butoxide and stirred homogeneously. The mix already completed The essential oils are slowly stirring and added slightly warm to approx. 30 - 35 ° C.

Citric acid and tri-potassium citrate are dissolved in water and added at room temperature with stirring. If required, is adjusted to pH 4.0 with KOH or HCl solution. A clear, yellowish colored solution is obtained with a pH of 4.0, which can be used immediately.

The insecticidal activity of the formulation according to the example was against common formulations in houseflies (Musca vulgaris) tested. The result is as follows:

Effectiveness*)

The insecticide spray is kind to the skin (no erythema or Skin irritation) in humans and animals, what by dermatological tests were found. As more desirable Side effect is an inhibitory effect against bacteria and fungi mention.

Claims (1)

An aqueous, biological insecticide spray formulation, characterized in that the formulation consists of a mixture of 0.5 to 1.0% w / w pyrethrin extract, 0.01 to 0.5% black pepper oil and additives with and without other essential Oils and piperonyl butoxide. The oily components are brought into an aqueous, clear emulsion and kept at a pH of 3.0 to 5.0 by means of suitable organic acids.