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Insect repellent-Pyrethrins

The pyrethrins are a class of organic compounds normally derived from Chrysanthemum cinerariifolium that have potent insecticidal activity by targeting the nervous systems of insects. Pyrethrin is synthetically made by industrial methods, but it also naturally occurs in chrysanthemum flowers, thus is often considered an organic insecticide, or at least when is not combined with piperonyl butoxide or other synthetic adjuvants. Their insecticidal and insect-repellent properties have been known and used for thousands of years.

Pyrethrins are gradually replacing organophosphates and organochlorides as the pesticides of choice, since these other compounds have been shown to have significant and persistent toxic effects to humans. Because they are biodegradable compounds, pyrethrins are now widely regarded as being preferable to pyrethroids, which is the name of a group of synthetic analogues of pyrethrin that accumulate in the environment. Pyrethrins are considered to be low-toxicity pesticides from a human health standpoint.

Well after their use as insecticides began, their chemical structures were determined by Hermann Staudinger and Lavoslav Ružička in 1924. Pyrethrin I (CnH28O3) and pyrethrin II (CnH28O5) are structurally related esters with a cyclopropane core. Pyrethrin I is a derivative of (+)-trans-chrysanthemic acid. Pyrethrin II is closely related, but one methyl group is oxidized to a carboxymethyl group, the resulting core being called pyrethric acid. Knowledge of their structures opened the way for the production of synthetic analogues, which are called pyrethroids. Pyrethrins are classified as terpenoids. The key step in the biosynthesis of the naturally occurring pyrethrins involves two molecules of dimethylallyl pyrophosphate, which join to form a cyclopropane rings by the action of the enzyme chrysanthemyl diphosphate synthase.

Where to buy pyrethrins?

You may have deep understanding of pyrethrins. Xi'an Fengzu Biological Techology Co.,Ltd., as a China professional supplier of biopesticide, has been devoting to providing various biopesticide with favorable price. We have pyrethrum extract with pyrethrum liquid with content varied from 20% to 50%.You can send E-mail to sales@fengzusw.com directly for a competitive price and professional knowledge. For long time cooperation, free samples is available. We're looking forward your inquiry.


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Xi'an Fengzu Biological Technology Co.,Ltd
Manufacturer Add: Industrial Park in Wugong County, Xianyang City,Shaanxi Province, China.
Office Add: 21F, Tangfengguoji,No.18 Fenghuinanlu, Xi'an City, Shaanxi Province, China.
Office Tel: 86-029-89561932/86-135-7248-9476             Office Fax: 86-029-8918-9705
Email: sales@fengzusw.com                                            Skype: fengzusw