AT- f

Question 1

What qualitative reagents are used to identify biological molecules?

Answer 1

1. starch: potassium iodide or iodine solution: yellow to black
2. reducing sugars (monosaccharides): Benedict’s reagent: red precipitate
3. non-reducing sugars (di/polysaccharides): HCl, Sodium Hydrogen Carbonate + Benedict’s reagent test: red precipitate
4. lipids: ethanol + water emulsion test: white milky colour
5. proteins: biuret solution: blue to purple precipitate