Pyrethroid pesticides ine yakasimba chiral maitiro uye kazhinji ine akawanda chiral enantiomers.Kunyangwe aya ma enantiomers ane chaiwo chaiwo emuviri nemakemikari zvimiro, anoratidza zvakasiyana zvachose zvekuuraya zvipembenene uye zvipenyu zvimiro mu vivo.Toxicity uye mazinga asara ezvakatipoteredza.Zvakadai seCypermethrin, Beta-Cypermethrin, Alpha-cypermethrin;beta-cypermetrin, cyhalothrin;Beta Cyfluthrin, cyfluthrin, nezvimwe.

Cypermetrin
Cypermethrin ndiyo inonyanya kushandiswa pyrethroid pesticide.Yayo molecular chimiro ine 3 chiral centers uye 8 enantiomers.Akasiyana enantiomers anoratidza mutsauko wakakura mune biological chiitiko uye chepfu.
Iwo 8 optical isomers eCypermethrin anoumba 4 pairi dzemadzinza.Pane misiyano iri pachena mukuuraya mhedzisiro uye kukurumidza kwefotolysis yeasomers akasiyana eCypermethrin pane zvipembenene.Basa ravo rekuuraya zvipembenene kubva kune yakasimba kusvika kune isina simba inonzi cis, trans Formula, cis-trans cypermethrin.
Pakati pemaisomeri masere eCypermethrin, maviri eina ma trans isomers uye mana cis isomers anoshanda zvakanyanya.
Nekudaro, kana iyo imwechete yepamusoro-inoshanda isomer yeCypermethrin ikashandiswa semushonga wezvipembenene, kwete chete basa rayo rekuuraya zvipembenene rinogona kuvandudzwa zvakanyanya, asiwo chepfu kune zvisingatarisirwi zvipenyu uye mhedzisiro yakaipa pane zvakatipoteredza inogona kuderedzwa.Naizvozvo Beta-Cypermetrin neAlpha-cypermetrin zvakavapo:

Alpha-cypermetrin
Alpha-cypermethrin inoparadzanisa mafomu maviri-akaderera kana asingabatsiri kubva musanganiswa ane mana cis-isomers, uye inowana musanganiswa we1: 1 une maviri chete e-high-efficiency cis-isomers.
Alpha-cypermethrin ine kaviri kuita kwezvipembenene zveCypermethrin.

Beta-Cypermetrin
Beta-Cypermethrin, zita rechirungu: Beta-Cypermethrin
Beta-Cypermethrin inonziwo high-efficiency cis-trans cypermethrin.Iyo inoshandura iyo isingashande fomu yehunyanzvi cypermethrin ine 8 isomers kuita yakakwirira-inoshanda fomu kuburikidza necatalytic isomerization, nekudaro kuwana yakakwira-inoshanda cis isomers uye yakakwirira-yakanyanya cypermethrin.Musanganiswa wemapeya maviri evatambi vetrans isomers vane 4 isomers, uye reshiyo yecis netrans inokwana 40:60 kana 2:3.
Beta- Cypermethrin ine zvipembenene zvakafanana neCypermethrin, asi kushanda kwayo kwezvipembenene kunosvika ka1 kupfuura yeCypermethrin.
Beta-Cypermethrin haina muchetura kuvanhu nemhuka, uye huturu hwayo kune zvipembenene zvehutsanana hwakaenzana kana hukuru pane Alpha-cypermethrin, saka ine zvimwe zvakanakira mukudzivirira uye kutonga kwehutsanana.

Pfupisa
Sezvo biological chiitiko checis-yakakwirira-inoshanda fomu kazhinji yakakwirira kupfuura iyo ye trans-yakakwirira-inoshanda fomu, kurongeka kwekuuraya zvipembenene kwehama nhatu dzecypermethrin kunofanirwa kuve: Alpha-cypermethrin≥Beta-Cypermethrin>Cypermethrin.
Nekudaro, Beta-Cypermethrin ine zvirinani zvehutsanana kudzora tupukanana pane zvimwe zvigadzirwa zviviri.