Class 12 Chemistry Chemistry In Everyday Life Antiseptics & disinfectants

Antiseptics & disinfectants

  • Antiseptics are applied to the living tissues such as wounds, cuts, ulcers and diseased skin surfaces.
  • Examples are furacine, soframicine, etc. These are not ingested like antibiotics.
  • Commonly used antiseptic, Dettol is a mixture of chloroxylenol and terpineol. Class_12_Chemistry_Isolation_Of_Elements_Diagram17
  • Bithionol (the compound is also called bithionol) is added to soaps to impart antiseptic properties.
  • Iodine is a powerful antiseptic. Its 2-3 per cent solution in alcohol water mixture is known as tincture of iodine.
  • It is applied on wounds.
  • Iodoform (CHI3) is also used as an antiseptic for wounds.
  • Boric acid in dilute aqueous solution is weak antiseptic for eyes.

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Disinfectants

  • They are applied to inanimate objects such as floors, drainage system, instruments, etc. Same substances can act as an antiseptic as well as disinfectant by varying the concentration.
  • For example, 0.2 per cent solution of phenol is an antiseptic while its one percent solution is disinfectant.
  • Chlorine in the concentration of 0.2 to 0.4 ppm in aqueous solution and sulphur dioxide in very low concentrations, are disinfectants.

 

Antifertility Drugs

  • These are the chemical substances which are used to control pregnancy.
  • They are also called as oral contraceptives.
  • Birth control pills essentially contain a mixture of synthetic estrogen and progesterone derivatives. Both of these compounds are hormones.
  • It is known that progesterone suppresses ovulation.
  • Synthetic progesterone derivatives are more potent than progesterone.
  • Norethindrone is an example of synthetic progesterone derivative most widely used as antifertility drug. The estrogen derivative which is used in combination with progesterone derivative is ethynylestradiol (novestrol).

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