Effect of temperature on Vitamin C content

1141 Words May 6th, 2014 5 Pages
Effect of Temperature on Content of Vitamin C
Introduction
A daily intake of Vitamin C is essential for humans. Without it, the disease scurvy develops as sailors, explorers and people during the long winters in the Northern hemisphere found before the time of Captain Cook. The British Navy started giving sailors lime juice to prevent scurvy on long voyages in 1795. Vitamin C is found in high levels in foods such as oranges, limes, lemons, blackcurrants, parsley and capsicums. Vitamin C is water soluble and is therefore not stored or synthesized in the body, thus a daily supply is required. It breaks down, and is no longer effective due to factors such as extreme temperatures or storage for more than a few days.
Aim
To investigate the
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At 70°C vitamin C is denatured so it should be preserved below 70°C to avoid heat damage. (Admin, 2013) This experiment should show a result of decreased vitamin C content as the temperature is increased.
It can be seen from the results table and graph of this experiment that the lower the temperature the more vitamin C is present in the orange juice. Each trial was fairly precise and the average showed a near consistent decrease in vitamin C content as the temperature increased. The average drops at 25°C were 14 and the average at 100°C was 4 showing a decrease in 10 drops. The results supported the hypothesis as it was clearly seen that as the temperature of the juice increases the content of Vitamin C will decrease.
The procedural method was solid and straightforward. There were, however a couple possible sources of error. Using droppers to measure the hydrochloric acid and add the iodine is not very accurate and may produce different quantities which could affect the results. This random error maybe reduced by getting a more accurate measuring device. The major problem however was the interpretation of the colour purple once adding the iodine drops. This is a random error as it affects each result differently depending on the interpretation. To reduce this error, a colour chart should be used to compare with the solution to give a more accurate result on the interpretation of purple. Oxygen and sunlight also denatures vitamin C. The longer the

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