Organophosphorous And Carbamates Insecticides

 Organophosphorous And Carbamates Insecticides Essay


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Bacanto, Kharen Mae B.

Mangga, Medelen Sixth is v.

Paquit, Ruby F.



• Organophosphorus insecticides are normally

esters, amides, or thiol derivatives of

phosphoric, phosphonic, phosphorothioic, or

phosphonothioic acids. Most are only a little bit

soluble in water and still have a high oil-to-water

partition pourcentage and low vapor pressure.

• Organophosphates

- are commonly used for small animals since

flea and tick power products, sprays, foggers,

shampoos and dips, flea collars, and formerly,

as systemic insecticides.

• Illustrations: Malathion, dibrom, chlorpyrifos,

temephos, diazinon and terbufos are


Function of Actions

• Organophosphorus insecticides put in their

acute effects in both bugs and mammals by

inhibiting acetylcholinesterase (AChE) in the

nervous system with subsequent

piling up of dangerous levels of acetylcholine

(ACh), a neurotransmitter. In several

cases, the organophosphorylated chemical is

quite stable, to ensure that recovery from intoxication

might be slow.

Precisely what is Acetylcholinesterase (


•  An enzyme that destroys

down the�


acetylcholine at the�

synaptic clef (the space

between two nerve cells)

so the following nerve behavioral instinct

can be sent across

the synaptic gap.

Effects of Poisoning

• Long-term toxicity

• Repeated or prolonged exposure to

organophosphates can result in the same effects since

acute exposure including the delayed symptoms.

• Other results repeatedly revealed include reduced

memory and concentration, disorientation, severe

depressions, irritability, misunderstandings, headache, presentation

difficulties, postponed reaction moments, nightmares,

walking while asleep and sleepiness or insomnia.

• An influenza-like condition with headaches, nausea,

weakness, loss of hunger, and discomfort, uncomfortableness.

• Low level exposure

• Even in relatively lower levels organophosphates

might be hazardous to human wellness. The pesticides

act on some brain chemicals� closely associated with

those associated with ADHD, hence fetuses and young

children, where human brain development will depend on a

rigid sequence of biological events, may be the majority of

at risk. They can be absorbed through the lungs or

skin or by eating them on foodstuff.

Carbamate Insecticides

• Carbamate insecticides are derivatives of

carbamic acid, HOC(O)NH2. They have the

general formula displayed below wherever R is usually an

liquor, oxime or phenol and R1 can be hydrogen

or a methyl group.




• Carbamates vary within their spectrum of activity,

mammalian toxicity and persistence. They are

relatively unstable compounds that break down

inside the environment within weeks or perhaps months.

Carbamates are commonly applied as surface

sprays or baits in the control of home pests.

• Examples: Aldicarb, carbaryl, propoxur, oxamyl

and terbucarb


• Carbaryl, the 1st successful carbamate, was

presented in 1956. Two unique qualities have made

it a widely used insecticide. First, it has very low

mammalian, oral and dermal toxicity. Secondly, it has

a rather broad spectrum of insect control. This has

resulted in its extensive use being a lawn and garden insecticide.

• Propoxur is highly powerful against cockroaches that

have developed resistance to organophosphates.

• It truly is commonly used by simply pest control operators pertaining to the

power over cockroaches and other household bugs

in eating places, kitchens and homes.

• Bendiocarb has found its best use being a

household, grass and ornamental insecticide.

• Methomyl is often applied as the fly trap.

• Several carbamates possess systemic use in

plants since they have a large water

solubility which allows them to be taken up by

the roots and into the leaves of plants.

Mode of Action

• The method of action of carbamate insecticides is extremely

similar to that of the organophosphate insecticides as they

inhibit cholinesterase enzymes. However , they differ in

action from the...

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