Section 2 - Blue Flashcards
1
Q
State the chemical used to test for starch and give the positive result
A
Iodine; turns brown –> blue-black.
2
Q
State the chemical used to test for protein and give the positive result
A
Biuret; turns blue –> purple.
3
Q
Describe the chemical test for lipids and give the positive result
A
Dissolve sample in ethanol and add cold water; lipids present if a cloudy, white emulsion appears.
4
Q
Describe the chemical test for glucose and give the positive result
A
Add Benedict’s solution to sample and HEAT in a hot water bath; if glucose present, turns blue –> brick red (green, orange intermediate colours).
