( iii) Tincture of iodine is a 2-3 % solution of iodine in alcohol, which is a powerful antiseptic for wounds.
( iv) Iodoform( CHI3) is also used as an antiseptic for wounds.( v) Boric acid in dilute aqueous solution is weak anIUS4! pa eyes.
3. Disinfectants
These are the chemical substances which kill microorganisms not safe to be applied to the living tissues. They are generally kill the microorganisms present on inanimate objects such as drainage systems, instruments, etc.
Some common examples of disinfectants are as follows:
( i) 1 % phenol solution is disinfectant while in lower concentration 0.2 % solution of phenol is antiseptic.
( ii) 0.2-0.4 ppm aqueous solution of chlorine is used for sterilisation of water to make it fit for drinking purpose.
( iii) SO2 at very low concentrations behaves like disinfectant.
( iv) Formaldehyde( HCHO) in the disinfecting rooms and operation gaseous theatres forms is used in hospitals. for
Antifertility Drugs
These are the chemical substances used to control the pregnancy. These are also called oral contraceptives. They belong to the class of natural products, known as steroids.
Birth control pills essentially contain a mixture of synthetic estrogen and progesterone derivatives. Norethindrone is widely used as antifertility drug.
Chemicals in Food
1. Artificial Sweetening Agents
Sucrose( table sugar) and fructose are the most widely used natural sweeteners. But they add to our calorie intake and promote tooth decay. To avoid these problems many people take artificial sweeteners.