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This test is performed to test the presence of cysteine in the test solution (protein solution)
Biuret solution
Add a sulfate solution: BaSO4 precipitates!
Heller's test is commonly used to test for the presence of proteins in urine. The presence of albumin is indicated by formation of a white ring at the junction of the solution and a concentrate solution of nitric acid.
alcohol , iodine solution
Benedict's test estimates on color scale the presence of sugar .Normally used as a random pathological chemical test to determine the presence of sugar in urine in diabetes patients.In presence of sugar Benedict's solution turns from blue to shades of yellow,red,brown & dark according to the percentage of sugar present in solution on heating the solution.
Salkowsk's test is a test for cholesterol;when concentrated sulfuric acid is added to a chloroform solution of cholesterol, the chloroform layer shows a red to blue color and the acid layer shows a green fluorescence.
The chemical used to test for the presence of starch is iodine.
Presence of starch. Polymers of reducing sugars.It's used to test for the presence of glucose in a patients urine - a standard test for diabetes.starchBenedict's reagent is used as a test for the presence of all monosaccharides, and generally also reducing sugars. These include glucose, galactose, mannose, lactose and maltose. Even more generally, Benedict's test will detect the presence of aldehydes (except aromatic ones), and alpha-hydroxy-ketones, including those that occur in certain ketoses. - wikipedia
It is used to test for the presence of starch in substances.
It's a qualaitative test to test for the presence of the borate anion in the solution
Cholesterol is found in fatty foods. The health hazards of too much cholesterol or high cholesterol levels is risk of heart disease, heart attack or stroke. The presence of high cholesterol levels is detected by a blood test. It can be treated by a change in diet or medication.