Detection of Adulteration in Khoa
Detection of Adulteration in Khoa
Objectives:
To detect adulterated khoa.
Relevant information:
Khoa is often adulterated with wheat or rice flour (starch). Hence iodine method is used to its direction; iodine solution gives intense blue colour with starch due to formation of unstable complex starch iodine compound.
Material required:
i) Khoa
ii) Starch
iii) Water
iv) Iodine solution (1%)
Apparatus:
i) Test tube
ii) Test tube holder
iii) Gas burner
iv) Physical balance.
Procedure:
1. Mix about 5 gm of khoa in 15 ml water.
2. Take about 3 gm of the mixed solution in a test tube.
3. Boil the content over a burner.
4. Cool and add one drop of 1 % iodine solution and observe the colour.
5. Presence of starch as adulterant in khoa gives blue colour with iodine solution.