Vitamin C (also accepted as ascorbic acid) is awful ambiguous and has abbreviate shelf-life. While green fruits accept aerial concentrations of vitamin C, this diminishes as the bake-apple ripens. As accomplished fruits age, the vitamin C continues to disappear.
Students can appraise these phenomena application a starch and iodine solution. Iodine reacts to starch by acceptable amethyst unless vitamin C is present which is why the abysmal amethyst starch iodine band-aid turns bright back acceptance dribble it into the orange juice. While the accuracy dissipates by the abacus added iodine starch solution, college concentrations of vitamin C will crave added iodine-starch band-aid to anticipate the admixture from clearing.
Although reagents and glassware can be acquired from a lab accumulation house, hopefully acceptance can borrow these from their schools. Distilled baptize is accessible in ample grocers or from your academy lab. Cornstarch is accessible from grocery stores. It may be easier to get green oranges if you alive in Florida or California area you can get them from a tree.
Before starting the experiment, accomplish two solutions: (1) the starch acknowledgment band-aid and (2) 0.01 N iodine.These two solutions are fabricated as directed below.
Starch Solution
0.01 N Iodine Solution
Starch-Iodine Solution
Experimental Protocol
Terms/Concepts: Vitamin C (ascorbic acid, Application a basin and authoritative solutions, Concentration of vitamin C as a action of accomplishment and age of fruit; Chemical stability
References:
Books
Hobbs, Christopher & Elson Haas. Vitamins for Dummies. For Dummies Press (1999)
Journal Articles
Katherine M. Phillips et al. “Stability of Vitamin C in Frozen Raw Bake-apple and Vegetable
Homogenates” Journal of Food Composition and Analysis. 23 253–259 (2010)
http://www.ars.usda.gov/SP2UserFiles/Place/12354500/Articles/jfca123_253–259.pdf
Websites
Linus Pauling Institute: Vitamin C
http://lpi.oregonstate.edu/infocenter/vitamins/vitaminC/
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