Biology Help

[GhadaDG]

I need the notes for test of starch, fat, protein, reducing sugar and stuff like that

 

[xIshtar]

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.

 

[Parfals]

me too!!

 

[xIshtar]

me too!!

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

 

[Adahshan]

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

 

[GhadaDG]

Thanks

 

[xIshtar]

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.