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Project Summary
| Difficulty | 3 |
| Time required | Very Short (a day or less) |
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Sponsor
| Sponsored by a generous grant from the Camille and Henry Dreyfus Foundation |
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| * Note: This is an abbreviated project idea, without notes to start your background research or a procedure for how to do the experiment. You can identify abbreviated project ideas by the asterisk at the end of the title. If you want a project idea with full instructions, please pick one without an asterisk. |
Abstract
Some laundry detergents have added enzymes that break down proteins, helping to remove them from the cloth fibers, and thus remove stains. You can perform a scientific test of these enzymes' stain-fighting ability. Do background research on the enzyme(s) in the detergent, and on the substances you choose for making the stains. Try to predict for which substances the enzymes will be effective. Cut a piece of light-colored cotton cloth into identical 10-cm squares. Choose different types of stains you'd like to test (e.g., mustard, grass, egg yolk). For each substance, prepare identical stains on three pieces of cloth: one for washing with regular detergent, one for washing with enzyme-containing detergent and one that is not washed, for comparison. Circle the stained area with permanent marker. Also label the squares to indicate which treatment the fabric received (stain and washing). Prepare detergent solutions and wash the squares in the same way (e.g., by shaking them in a closed jar for a specified amount of time). Rinse, dry and compare the results. Here are some additional ideas you might try. Many proteins are denatured when heated to 60°C or more. Do you get the same results if you heat the detergent solutions before using them (hint: use a double-boiler on your stove to do this). How do the pH values of the two detergents compare? (VanCleave, 1993, 25–29)Bibliography
VanCleave, J., 1993. A+ Projects in Chemistry: Winning Experiments for Science Fairs and Extra Credit. New York, NY: John Wiley and Sons.Variations
- For more science project ideas in this area of science, see Chemistry Project Ideas.
Last edit date: 2006-12-27 18:06:09
Career Focus
If you like this project, you might enjoy exploring careers in Chemistry.
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Chemist Everything in the environment, whether naturally occurring or of human design, is composed of chemicals. Chemists search for and use new knowledge about chemicals to develop new processes or products. |
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Chemical Engineer Chemical engineers solve the problems that affect our everyday lives by applying the principles of chemistry. If you enjoy working in a chemistry laboratory and are interested in developing useful products for people, then a career as a chemical engineer might be in your future. | |
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Chemical Technician The role that the chemical technician plays is the backbone of every chemical, semiconductor, and pharmaceutical manufacturing operation. Chemical technicians conduct experiments, record data, and help to implement new processes and procedures in the laboratory. If you enjoy hands-on work, then you might be interested in the career of a chemical technician. | |||
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