Using reagents in food tests Flashcards
1
Q
iodine solution
A
tests for starch
negative result is yellow/orange
positive is blue/black
2
Q
Benedict’s solution
A
tests for reducing sugar
blue if negative
green to orange to red (depending on the level of sugar present)
3
Q
biuret test
A
protein
pale blue if negative
pale purple if positive
4
Q
ethanol
A
fat
clear if negative
cloudy if positive
5
Q
The information shows the results of food tests carried out on a food sample.
Identify the substances in the food.
iodine: yellow/orange
Benedicts solution: green
biuret test: pale blue
ethanol: clear [4]
A
no starch
some reducing sugars
no protein
no fats
