A Biological Assay To Determine The Vitamin C Content OF Fresh Fruit Juices Compared To Commercially Sold Juices using DCPIP (dichlorophenolindophenol) as an Indicator.

             Sinead O’Keeffe.

             Word Count: 3991 words.

             Table of Contents.

             .

             Page.

             Introduction p. 1~3.

             Materials p. 3.

             Procedures p. 4.

             Chart Showing the Amount of Fruit Juice Needed in Millilitres p. 5~ 6.

             To Turn 2ml's of DCPIP from Blue to Clear with explanation.

             And analysis.

             Chart Showing the Different Amount of Each Juice in Millilitres p. 7.

             Needed to Turn 2ml's of DCPIP from Blue to Clear with.

             Explanation.

             The Amount of Commercially Drinks in Millilitres Needed to p. 8.

             Fulfill the Required Daily Allowance (RDA) of Vitamin C with.

             Explanation and analysis.

             The Amount of Fresh Fruit Juices in Millilitres Needed to Fulfill p. 9.

             The Required Daily Allowance (RDA) of Vitamin C with analysis.

             Evaluation p. 9~10.

             Bibliography p. 11.

             Endnotes p. 12.

             Abstract.

             Vitamin C (ascorbic acid) is a very important vitamin to the body. Vitamin C promotes healthy teeth and gums, helps absorption of iron, aids in maintenance of normal connective tissue, promotes wound healing, and helps boost the immune system.

             With vitamin C being such a useful substance to our bodies, finding good sources of vitamin C is important. Many people today rely on vitamin supplement tablets. But fruit juices, vitamin-supplemented drinks, or vitamin supplemented foods may contain just as much vitamin C as a supplement tablet. Which one is better though, commercially sold drinks or fresh fruit juices? This was the research question: Are commercially sold and popularly consumed juices (in Japan) a good substitute fro fresh fruits in terms of dietary vitamin C?.

             What this experiment sought to find out was exactly what kind of drink was better in terms of dietary vitamin C. The juices were titrated into a set amount of DCPIP and measuring how many millilitres it took for the DCPIP to turn from blue to clear.