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Biology Help

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I need the notes for test of starch, fat, protein, reducing sugar and stuff like that
 
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Starch:
Iodine, observe a colour change from brown to blue-black.

Reducing Sugars:
Cut or grind off a small sample and add it to water to attempt to dissolve it. Then add Benedict's solution and heat using a waterbath. Observe a colour change from blue to brick-red.

Protein:
Cut or grind off a small sample and add it to water to attempt to dissolve it. Add potassium hydroxide and copper sulphate. Observe a colour change from blue to purple.

Fat:
Cut or grind off a small portion. Place in a test tube of ethanol and shake. Add the liquid part of this mixture to a test tube containing water. Observe a cloudy emulsifying change.
 
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Parfals said:

xIshtar said:
Starch:
Iodine, observe a colour change from brown to blue-black.

Reducing Sugars:
Cut or grind off a small sample and add it to water to attempt to dissolve it. Then add Benedict's solution and heat using a waterbath. Observe a colour change from blue to brick-red.

Protein:
Cut or grind off a small sample and add it to water to attempt to dissolve it. Add potassium hydroxide and copper sulphate. Observe a colour change from blue to purple.

Fat:
Cut or grind off a small portion. Place in a test tube of ethanol and shake. Add the liquid part of this mixture to a test tube containing water. Observe a cloudy emulsifying change.

If you want anything else, just ask :)
 
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Just thought of dropping an advice, When doing tests for protein, sugar and fats, make sure you don't forget to crush/grind/dissolve in water
 
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Adahshan said:
Just thought of dropping an advice, When doing tests for protein, sugar and fats, make sure you don't forget to crush/grind/dissolve in water

When you test for fats, you don't dissolve in water.
 
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