Wednesday, November 30, 2011

2.7 Lab Tests for glucose and starch

2.7 describe the tests for glucose and starch

1. Glucose (C6 H12 O6) positive test 
a) Take glucose powder and dissolve it in a test tube 
b) Add  Benedict's Reagent (blue) 
c) Take test tube and place in a water bath to boil (60-70C) for 2-3 minutes
d) Remove test tube
Result = colour change from blue to orange.

2. Starch positive test 
a) In solid form = white powder
b) Place some white powder into a spotting tile 
c) Add Iodine Solution (brown)
Result = colour change from brown to dark blue/black colour

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