|MadSci Network: Chemistry|
From: http: //www.ext.vt.edu/news/periodicals/foods/products/99feb-09.html "Milk/Vitamin D: Opaque containers protect milk by blocking light which breaks down vitamin A and riboflavin. Fluorescent light can destroy 70 percent of vitamin A and 20 percent of riboflavin. Sunlight depletes vitamins more quickly, but white light from household bulbs destroys nutrients more slowly. As milk loses it nutrients, flavor losses become quite pronounced. (Tufts Univ. Health & Nutrition Letter Jan 1999)." The biggest hurdle for your science fair project would be the vitamin analysis. Vitamin anaylsis would take considerable scientific expertise and equipment. For instance, I checked the web for similar projects and found none. Using Alta Vista http://www.altavista.com and the search terms: +"science fair" +milk +nutrient +light 23 pages turned up. Other search engines would yield similar results One page was: http://members.aol.com/ScienzFair/microbio.htm Here's a 1996 project that was similar but I suspect analytical problems stymied the project as I see no data. http://hine.k12.dc.us/~scifair/1996/biochem/tomia.html You might try your State Extension Service people in Amherst, MA for information and ideas. http://www.reeusda.gov/statepartners/ma.htm Here's a list of people: http://www.umass.edu/umext/programs/4h/people_educators.htm I'd ask for a dairy scientist as they'd know the literature of light effects on milk and perhaps would have a suggestion for a suitable science fair project. For example, the effect of light on taste would fairly simple to preform. Add a literature search on how various light frequencies stimulate certain chemical reactions in milk and your daughter would have a "tasty" project. Remember, the judges also grade on how well the scientist understands the science behind the project. Lotsa chemistry and physics here. Good luck
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