Analysis Of Fresh Navel Orange Juice

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Discussion
According to the hypothesis, the fresh Navel orange juice was expected to have a higher concentration of vitamin C than Coles orange juice However, according to the results, as seen in Graph 2, Coles Orange juice had higher concentration of vitamin C compared to the Fresh Navel orange juice, and contradicted the hypothesis.
From Graph 2, at 8oC, Coles orange juice had 19.7% higher concentration of vitamin C than fresh navel orange juice, because fresh juice had 15.62mg/100mL, whereas artificial juice had 19.46mg/100mL, contradicting the hypothesis. At 19oC, Coles orange juice had 14% higher concentration of vitamin C than fresh navel orange juice, because fresh juice had 15.30mg/100mL, while artificial juice had 17.80mg/100mL, also
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This followed the trend in Graph 1 as the line went down, representing that the vitamin C level dropped. Fresh navel orange juice had 15.62mg/100mL and 15.30mg/100mL at 8oC and 19oC respectively and showed 2.05% reduction from the vitamin C level at 8oC. This also followed the trend in Graph 1 as the line went down, indicating that the vitamin C level dropped. However, at 33oC, the vitamin C level rose up to 17.38mg/100mL in fresh juice which had to be ignored as it is an anomaly and does not follow the trend in Graph 1 as it is above the trend …show more content…
As mentioned in Discussion, unlike the other results gathered, it did not follow the trend of ‘increase in temperature decreases vitamin C’. This could have happened because of the group used different Navel Orange for this titration as it was the only test that was conducted on a different day. Also, on the day when the other results were collected, the burette was very slow in dripping DCPIP so the fruit juices might have oxidised further during the titration due to longer time of exposure in air. In this case, the concentration of vitamin C of fresh navel orange juice at 33oC might be more accurate as it had less air exposure but because the controlled variables were not constant between this and the other results, the level of vitamin C of fresh navel orange juice at 33oC was excluded as an anomaly. To improve, the air exposure time need to be constant throughout all titre by using the same equipment and same source of

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