Which test is used to detect the presence of lipids?

The Sudan Red Test is specifically designed to detect the presence of lipids in a sample. This test uses a dye that binds to lipids, allowing them to be visualized. When lipids are present, they will absorb the dye, resulting in a reddish coloration, indicating a positive result. This method takes advantage of the hydrophobic nature of lipids, which allows the dye to dissolve in lipid-rich substances.

In contrast, other tests serve different purposes: the Biuret Test is oriented towards proteins, identifying the presence of peptide bonds; Benedict's Test is used for detecting reducing sugars; and the Starch Test, often using iodine, is utilized to test for carbohydrates, specifically starch. Each of these tests is tailored to specific macromolecules due to their distinct chemical properties, which is why the Sudan Red Test stands out for lipid detection.