Quantitative Analysis of Vitamin C Contained in a Fruit Juice

916 Words Jul 15th, 2013 4 Pages
Laboratory exercise 3 : Quantitative analysis of vitamin C contained in a fruit juice
Aim: To investigate the amount of vitamin C found in all kinds of fruit juice
Introduction :
Vitamin C is an antioxidant, along with vitamin E, beta-carotene, and many other plant-based nutrients. Antioxidants block some of the damage caused by free radicals, substances that damage DNA. The build-up of free radicals over time may contribute to the aging process and the development of health conditions such as cancer, heart disease, and arthritis.
It' s rare to be seriously deficient in vitamin C, although evidence suggests that many people may have low levels of vitamin C. Smoking cigarettes lowers the amount of vitamin C in the body, so smokers are
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Oxidation is a chemical reaction that transfers electrons or hydrogen from a substance to an oxidizing agent. Oxidation reactions can produce free radicals. The free radicals are molecules produced during normal metabolism or as a result of an unhealthy diet or exposure to pollution, tobacco smoke and chemicals. Free radical damage may play a role in heart disease, cancer and other diseases. It is found naturally in all sorts of foods, including fruits, vegetables and nuts, and also in nutritional supplement form.
To determine whether the experiment is accurate or not
When the DCPIP is decolourise by the fruit juice
The error that might present in this experiment is that the fruit juice might being oxidise by oxygen. As it was prepared before the experiment starts.
One should consume 98.36 ml of orange juice as there is 0.61mg of vitamin C in 1 ml of orange juice.
The fruit juices are exposed to oxygen. The process of oxidation depends on the amount of oxygen present in the air. True oxidation happens on a molecular level but we can

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