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Abstract

The objective: Which citrus fruit contains the highest absolute vitamin C content? Is that value affected if it is covered or uncovered? My objective is to find which type of citrus fruit contains the highest absolute vitamin C content and to see if over time having the fruit juice covered or uncovered affects the vitamin C content.

Methods/Materials

5cc Syringe, Plastic containers with lids, Plastic containers without lids, 500mL of 1% starch solution, Iodine, 250mg vitamin C tablets, 25mL Pipettte, 100mL Burette with stop cock, 250mL of distilled water, Juicer, 2125mL of juice of the following:

Florida grapefruit, Lemons, Valencia oranges, Limes, Minello Tangerines. I used the titration method to test for the absolute vitamin C conent in the juices

Results

Results were as follows: for the fresh test, the oranges had the highest vitamin C content, followed by lemons, grapefruits, tangerines, and limes.

When looking at the vitamin C content in the stored juice both the covered and uncovered samples had about the same amount of vitamin C contentby day 8, though it was lost at different rates.

Conclusions/Discussion

Valencia oranges had the highest absolute vitamin C content when freshly squeezed. This disproved my hypothesis that the lemons would have the highest content. I have also concluded that the environment in which juice is stored can affect its vitamin C content but not as significantly as I expected.

At first the covered juice lost vitamin C slower than the uncovered, however, it kept loosing each day.

The uncovered lost vitamin C content very rapidly within the first few days but was then able to stabilize itself to the point that by day 8 it had basically the same vitamin C content as the covered.

This project is about testing different citrus fruits for their absolute vitamin C content and how that value is affected by storage

Science Fair Project done By Camille T. Miake