EDUPEDIYA – FOOD ADULTERATION PART-3

EDUPEDIYA – FOOD ADULTERATION PART-3

 

CHEMICAL METHODS TO IDENTIFY ADULTERATED FOOD:

FRUITS & VEGETABLES:

METHOD 1: take a cotton piece soaked with water or oil and rub the outer surface of green vegetables or fruits, if cotton turns to green color it indicates the presence of malachite green.

Ø In sweet potato same technique is followed, if cotton absorbs the color it indicates the presence of rhodamine B.   

ADULTERANT: malachite green& rhodamine B.

METHOD 2: fruits are mainly adulterated pesticides, plant hormones, carbide for ripening fruits.

ADULTERANT: carbide, pesticides.

HONEY:

METHOD 1: take a sample and put in a glass of water, if honey dissolves in water it indicates the presence of sugar syrup. Normal honey will settle at the bottom.

ADULTERANT: sugar syrup.

METHOD 2: take a match stick dipped in matchstick and strikes the matchbox if light ups it is pure otherwise it is adulterated because honey is inflammable.

ADULTERANT: moisture.

DAL:

METHOD 1: visual examination is done to identify macro adulterants.

ADULTERANT: clay, stone, gravel, webs, insects & rodent hair.

METHOD 2: take the sample and soak it in water and add hydrochloric acid which gives pink color presence indicates metanil yellow.

ADULTERANT: metanil yellow.

SPICES, CONDIMENTS & SALTS:

METHOD 1: take the sample pepper and add it in a glass of water. Pure black pepper settles down, if it is floating on the surface indicates the presence of papaya.

ADULTERANT: papaya seeds.

METHOD 2: take the sample chilli powder and sprinkle in glass of water, chilli powder floats on the surface if it settles down brick powder is mixed. In water colored streaks appears if artificial color is added.

ADULTERANT: brick powder& artificial color.

METHOD 3: take turmeric whole and in glass of water, if color separates in water it indicates the presence of lead chromate and pure turmeric whole has no extraction of color.

ADULTERANT: lead chromate.

METHOD 4: take turmeric powder and add it in a glass of water, extraction of high coloration in water indicates the presence of artificial color.

METHOD 5: take a table spoon of asafetida and burn it in a flame pure particles burn heavily but adulterated particles don’t have bright flame.

Add asafetida in a glass of water if particles settle down it has soap stones and earthy matters.

ADULTERANT: resins& soap stones.

METHOD 6: add a table spoon of salt in water, solution becomes colored indicates the presence of chalk powder.

ADULTERANT: chalk powder.

BUTTER& GHEE:

METHOD 1: take the sample in a glass and add iodine solution to it, it turns blue if adulterated.

ADULTERANT: starch.

JAGGERY:

METHOD 1: add hydrochloric acid to the sample and if it turns to magenta color it is adulterated.

ADULTERANT: metanil yellow.

METHOD 2: add the sample to glass of water and adulterant settle down.

ADULTERANT: chalk powder& sugar.