BIOLOGY

test for Starch:

Add a few drops of iodine solution to the sample in a spotting tile

yellow-brown                          blue black

No starch is present               starch is present

Test for protein

Add 2cm of biuret solution to 2cm of each sample

pale blue                                     lilac

no protein is present                    protein is present

test for Lipids

Add 2cm of ethanol to 2cm of each sample. Add 2cm of distilled water.

Clear solution                         milky white suspension

fat is not present                    fat is present

Test For Simple Sugars 

Add 2cm of benedicts reagent to 2cm of each sample and heat the test tube in a hot water bath.

blue solution                                      brick red precipitate

no simple sugars are present              simple sugars are present