DR ZEYAD EMAD
01273115012
Food test
Test name
Method
Positive
result
Blue black
starch
Iodine test
Sugars
Benedict
test
One or two
drops of
iodine
directly into
the food
sample
Equal
‫بجيور‬
amount of
the food
sample and
the
benedicts
reagent and
boil in water
bath
Negative result
Orange brown
Blue
DR ZEYAD EMAD
01273115012
protein
Biuret test
Fat
Emulsion
test
Equal
Purple
amounts of
sodium
hydroxide
and the food
sample
Then add
few drops of
copper
sulfate
Dissolve the White
food in
emulsion
ethanol and
pour the
solution into
a clean test
tube of
water
blue
Clear
DR ZEYAD EMAD
Vitamin C DCPIP
01273115012
Add drops Colorless
of the food
solution into
a beaker
containing
DCPIP
solution
blue