Macromolecules Lab Report

The presence of macromolecules is able to be detected in solutions such as glucose, sucrose, starch, and proteins as well as other common foods. These other common foods include oats, soda, gelatin, and apple juice. There are four classes of macromolecules such as monosaccharides, disaccharides, polysaccharides and proteins. Each of these can be found using different tests such as the Benedict’s test, the Iodine test, or the Biuret test. Although there is no specific test for disaccharides it can be determined if the original color has not changed. If a substance is a monosaccharide it will have certain chemical changes with the Benedict’s solution. Once the substance and the solution are mixed and put it in hot water for five minutes, the

Apple juice had also tested positive for monosaccharides, it had turned a red color as well which was different from the original teal color. This substance also contained another macromolecule. A polysaccharide. This type of macromolecule can be determined when it chemically reacts with iodine. When a polysaccharide is mixed with iodine it turns a dark purple. When Apple juice was mixed with the Iodine solution it chemically reacted and turned into a dark purple from the original light yellow color it had. Which meant that this Iodine test came out positive, proving that it contains a polysaccharide as well as a monosaccharide. The same type of reaction happened with oats, the substances changed from a cloudy white to the dark purple concluding that there was a polysaccharide. The Iodine solution chemically reacted with the polysaccharides in the oats changing the color. Meanwhile a protein may be found when the Biuret solution is added to the substance and if a protein is within the item it chemically reacts and turns light purple. The only food that was tested positive when mixed with the Biuret solution was