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Topic: What makes synthetic pesticide less toxic than natural pesticide?  (Read 3585 times)

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Offline arian487

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What makes synthetic pesticide less toxic than natural pesticide?
« on: November 25, 2007, 09:20:16 PM »
Synthetic pesticide pyrethroid VS Natural pesticide pyrethrin to be more accurate.  This is an assignment I got and I can't seem to find solid info on anything.  There seems to conflicting evidence out there and I wasn't sure.  I'd appreciate a push in the right direction.
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Offline puppy8800

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Re: What makes synthetic pesticide less toxic than natural pesticide?
« Reply #1 on: November 26, 2007, 04:17:07 AM »
personal opinion:
natural pesticide is usually a chiral compound, while synthetic pesticide is probably a racemic compound, if synthesized achirally
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Offline AWK

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Re: What makes synthetic pesticide less toxic than natural pesticide?
« Reply #2 on: November 26, 2007, 09:26:44 AM »
Synthetic compounds are just selected for lower toxicity.
Pyrethrins themselves are one of the least poisonous
 insecticides to mammals. Its toxicity is in range ~80 to 4000 mg/kg

http://www.intox.org/databank/documents/chemical/pyrethrd/ukpid75.htm
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