The research is about four different orange juices. The hypothesis is that the homemade orange juice will contain the most vitamin C and that the Fanta contains the least.

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Battle of the juices 
Koff de, M. & Leeuwen van, L.
Christelijk Lyceum Delft, The Netherlands

Received march 2009

Summary
Vitamin C is a very important vitamin, however humans, human apes, bats and guinea-pigs are the only creatures that cannot make their own vitamin C.
People need every day around 70 mg vitamin C. This means we have to consume food or drink which contains vitamin C.  This vitamin has a lot of positive effects.
Because of the importance of this vitamin we are going to research which orange juice is the most healthiest.  
The research is about four different orange juices. The hypothesis is that the homemade orange juice will contain the most vitamin C and that the Fanta contains the least. The Appelsientje costs more and has a better reputation, that is why we think that this juice contains more vitamin C than the Surango.
With a buret, the indicator acetic acid and DCPIP-solution you can demonstrate the percentage vitamin C.
When more DCPIP-solution is used it means the juice contains more vitamin C. All the DCPIP-solution reacts with all the vitamin C. When all the DCPIP-solution has reacted with the vitamin C, the juice becomes red.
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Introduction

The chemical name of vitamin C is

Ascorbic Acid, C6H8O6.

Figure 1: Part of the molecular structure of vitamin C.

Ascorbic Acid is one of the thirteen vitamins that are solvable in water.

The advantage of this vitamins is that it is very hard to take an overdoses. Your body does not use all the vitamin C you have eaten, this excess of vitamin C just ‘flushes’ away. That is why it is better to eat food which contains vitamin C instead of eating vitamin C pills. Eating your vitamin C with food results in a better absorption of the vitamin.
Vitamin C is an important vitamin, it has a lot of positive effects. Meanly sportsman need vitamin C. Because during the performance a lot of vitamin C is used by the convert from carbohydrate to energy. Vitamin C is also concerned with other things.
It keeps your bones, teeth and gum healthy. It keeps your joints smooth and it is a hardly involved with the production of collagen. Collagen plays an important role in the growth and recovery of connective tissue (your skin). Studies have proved that one gram vitamin C per day can lower your cholesterol percentage. When you have a cold, extra vitamin C will decrease your ‘cycle’ ( from five days) with one day. Natural vitamin C (kiwis, oranges..) is chosen above vitamin C pills. The most important ‘task’ of vitamin C is the role of antioxidant, and the help the vitamin gives to the vitamins A and E with fulfilling their antioxidant tasks. Antioxidants are also very important. They prevent oxidation reactions in your body.  

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Humans, human apes, bats and guinea-pigs are the only creatures that cannot make their own vitamin C. Because of a gene defect we cannot make the enzyme L-gulonolactione oxidase. Without this enzyme we cannot complete the last step of the synthesis of vitamin C. We cannot make the vitamin ourselves, that means we have to eat food which contains vitamin C. A lot of food contains vitamin C, the most important are vegetables, fruit and potatoes. Much food has added vitamin C, the vitamin is a preservative. The E-number is E300.









Figure 2: Vitamin C under the microscope

Juices mostly have ...

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