Find out a qualitative test for proteins, fats and oils, and starch amino acids and test any fruit juice, saliva, sweat, and urine for them.

Asked by Pragya Singh | 11 months ago |  147

1 Answer

Solution :-

i. A qualitative test for proteins: Xanthoproteic test

Experimental Material Observation Inference
(a) Urine Yellow precipitate The formation of yellow precipitate suggests
the presence of protein in the food material
(b) Water No precipitate  

ii. A qualitative test for fats: Emulsification test

Experimental Material Observation Inference
(a) Sweat Oil droplets Formation of oil droplets
i.e., emulsification signifies the presence of fats
in the provided food material.
(b) Water No oil droplet  

iii. A qualitative test for oils: Paper test

Experimental Material Observation Inference
(a) Food material
(sample)
Paper turns into a
Translucent
Opaque paper becomes
translucent which
suggests the presence
of fats in the food
material
(b) Water Paper gets soggy  

iv. A qualitative test for starch: Iodine test

Experimental
Material
Observation Inference
(a) Fruit juices Blue-black colour
when few drops of
iodine are added.
The formation of blueblack
colour suggests the
presence of starch in the
provided food material.
(b) Water No change in colour  

 

Answered by Abhisek | 11 months ago

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