Loaʻa i nā pesticides Pyrethroid nā hiʻohiʻona chiral ikaika a loaʻa pinepine nā enantiomers chiral.ʻOiai ua like like kēia mau enantiomers i nā waiwai kino a me nā kemika, hōʻike lākou i nā hana insecticidal ʻokoʻa a me nā waiwai olaola i loko o vivo.Kaʻawaʻawa a me ke koena pae.E like me Cypermethrin, Beta-Cypermethrin, Alpha-cypermethrin;beta-cypermethrin, cyhalothrin;Beta Cyfluthrin, cyfluthrin, etc.

ʻO Cypermethrin
ʻO Cypermethrin ka lāʻau pesticide pyrethroid i hoʻohana nui ʻia.Aia i loko o kona ʻano molekala 3 mau kikowaena chiral a me 8 enantiomers.Hōʻike nā enantiomers ʻokoʻa i nā ʻokoʻa koʻikoʻi i ka hana olaola a me nā mea ʻawaʻawa.
ʻO nā isomers optical 8 o Cypermethrin e hoʻokumu i 4 mau hoa like.Aia nā ʻokoʻa ʻokoʻa i ka hopena pepehi a me ka wikiwiki photolysis o nā isomers like ʻole o Cypermethrin ma nā inike.ʻO kā lākou hana insecticidal mai ikaika a nāwaliwali ʻo cis, trans Formula, cis-trans cypermethrin.
Ma waena o nā isomers ʻewalu o Cypermethrin, ʻelua o nā isomers trans ʻehā a me nā isomers cis ʻehā i kūpono loa.
Eia nō naʻe, inā hoʻohana ʻia ka isomer kiʻekiʻe kiʻekiʻe o Cypermethrin ma ke ʻano he pesticide, ʻaʻole hiki ke hoʻomaikaʻi maikaʻi ʻia kāna hana insecticidal, akā hiki ke hōʻemi ʻia ka ʻona i nā mea ola ʻole a me nā hopena ʻino i ke kaiapuni.No laila ua hoʻokumu ʻia ʻo Beta-Cypermethrin a me Alpha-cypermethrin:

Alpha-cypermethrin
Hoʻokaʻawale ʻo Alpha-cypermethrin i ʻelua mau ʻano haʻahaʻa haʻahaʻa a maikaʻi ʻole paha mai kahi hui i loaʻa nā cis-isomers ʻehā, a loaʻa kahi hui 1: 1 i loko o ʻelua mau cis-isomers kiʻekiʻe.
ʻO ka Alpha-cypermethrin he pālua ka hana insecticidal o Cypermethrin.

Beta-Cypermethrin
Beta-Cypermethrin, inoa Pelekane: Beta-Cypermethrin
Ua kapa ʻia ʻo Beta-Cypermethrin he kiʻekiʻe-efficiency cis-trans cypermethrin.Hoʻololi ia i ke ʻano kūpono ʻole o ka cypermethrin ʻenehana i loaʻa nā isomers 8 i kahi ʻano kiʻekiʻe ma o ka isomerization catalytic, no laila e loaʻa ai nā isomers cis kiʻekiʻe a me ka cypermethrin kiʻekiʻe.ʻO ka hui ʻana o ʻelua mau hoa heihei o nā isomers trans he 4 isomers, a ʻo ka ratio o cis a me trans ma kahi o 40:60 a i ʻole 2:3.
ʻO ka Beta- Cypermethrin nā waiwai insecticidal like me Cypermethrin, akā ʻo kona ikaika insecticidal ma kahi o 1 mau manawa kiʻekiʻe ma mua o ka Cypermethrin.
ʻO ka Beta-Cypermethrin ka liʻiliʻi loa i nā kānaka a me nā holoholona, ​​​​a ʻo kona ʻona i nā pests maʻemaʻe ua like a ʻoi aku paha ma mua o Alpha-cypermethrin, no laila, loaʻa iā ia kekahi mau pono i ka pale ʻana a me ka mālama ʻana i nā pest sanitary.

Hōʻuluʻulu
No ka mea, ʻoi aku ka kiʻekiʻe o ka hana olaola o ka cis-high-efficiency form ma mua o ka trans-high-efficiency form, ʻo ke kauoha o ka hana insecticidal o nā kaikunāne ʻekolu o cypermethrin: Alpha-cypermethrin≥Beta-Cypermethrin>Cypermethrin.
Eia nō naʻe, ʻoi aku ka maikaʻi o ka Beta-Cypermethrin ma mua o nā huahana ʻelua.