Chemical Tests For Biologically Important Molecules Page 3
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4Procedure 4: Biuret Test for Proteins
Table 7: Predicted Results of Biuret Test
Protein
Potato
Amino Acid
Water
Egg White
Honey
Onion
Solution
Which of these solutions would be a positive control for Biuret?
•
Which of these solutions would be a negative control for Biuret?
•
.
Table 8: Actual Results of Biuret Test
Amino
Egg
Protein
Potato
Water
Acid
Honey
Onion
White
Solution
Result
Observed
Color
Based on your results, what had a higher amount of protein, egg white or honey?
•
In general, would you expect to find higher amounts of protein in plant-based foods or
•
animal-based foods?
Procedure 5: Testing Unknowns
Table10: Unknown Results
Possible Unknowns in My Unknown Groups
Component
A
B
C
reducing sugar
starch
fat
protein
The Unknown is
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