Project chosen: Investigation of the amount of Vitamin C in different fruits

Independent Variable: Type of fruit juices

Dependent Variable: Amount of Vitamin C
Constant Variable: Amount of liquid, type of iodine

In this project, we aim to find out the estimated amount of vitamin c in some commonly consumed fruits and find out which has the biggest amount of Vitamin C. Vitamin C plays a large role in our daily lives. It can help us for growth and repair our body tissues. Some proteins that is required to repair and maintain cartilage, bones and teeth are formed from Vitamin C. This shows how important it is to take in ample amount of vitamin C as our body relies on it to sustain itself. It can even reduce the severity of common cold. So, we decided to find out what fruit we should eat when we are sick.

Literature review:

What is our project about?
Investigation of the amount of Vitamin C in different fruits

Why are we investigating the Vitamin C in fruits?
Fruits are known to contain one of the most amounts of natural Vitamin C. Thus we want to find out through which fruit our body can obtain the most Vitamin C from.

What are the different fruits we are going to test?
Apple, Banana, Grapes, Watermelon,Strawberry, Lemon, Lime, Honeydew, Mango, Pineapple, Orange

What is Vitamin C?
Vitamin C is water-soluble and it is needed for growth and development. Leftover vitamin leave the body through the urine. That means you need a continuous supply of such vitamins in your diet.

What is the function of vitamin C?
-Vitamin C is used for growth and repair of the tissues in our bodies
-They form an important protein that is used to make skin, tendons, ligaments, and blood vessels
-Repair and maintain cartilage, bones, and teeth
-Vitamin C is a natural antioxidant. It help clear the build up of free radicals which build up when exposed to smoke/tobacco etc. When they build up, it causes aging, cancer  etc
-It helps to reduce the severity of common cold
-Vitamin C can improve the absorption of Iron to help our immune system to protect our body better.

What type of food contains vitamin C?
Vitamin C in a wide variety of fruits and vegetables. .Fruit juices have abundance of Vitamin C, such as orange juice, has enough for a daily intake of Vitamin C. Some of the fruits that are super rich in vitamin C are orange, kiwi, grapefruit, strawberries, cantaloupe and many more. Not only that, vegetables such as red pepper has 95 mg of Vitamin C, 5mg more than the recommended intake. There are also vegetables  that are rich in Vitamin C such as broccoli, brussel sprouts and potatoes.

Are there any side effects?
Taking in too much vitamin C can result in unfavourable results, such as diarrhea, flatulence, nausea and stomach cramps. People with hemochromatosis should be careful about their Vitamin C intake since this condition causes one to store too much Vitamin C. Also, since Vitamin C improve absorption of iron, this may be harmful for them if taken excessively. If not enough vitamin C is taken, it is also harmful to the body. There are some symptoms if there is a shortage of vitamin C, some of these symptoms includes: Anemia; decreased ability to fight infections; decreased wound-healing rate; dry and splitting hair; easy bruising; gingivitis; nosebleeds; possible weight gain because of slow metabolism; rough dry, scaly skin; swollen and painful joints; weakened tooth enamel.


How much vitamin C do we need per day?
The amount of vitamin C you need each day depends on your age. Average daily recommended amounts for different ages are listed below in milligrams (mg).
Life Stage
Recommended Amount
Birth to 6 months
40 mg
Infants 7–12 months
50 mg
Children 1–3 years
15 mg
Children 4–8 years
25 mg
Children 9–13 years
45 mg
Teens 14–18 years (boys)
75 mg
Teens 14–18 years (girls)
65 mg
Adults (men)
90 mg
Adults (women)
75 mg
Pregnant teens
80 mg
Pregnant women
85 mg
Breastfeeding teens
115 mg
Breastfeeding women
120 mg
If you smoke or are around secondhand smoke , add 35 mg to the above values to calculate your total daily recommended amount. Woman who are pregnant or breastfeeding also need more vitamin C.


What is the difference between natural vitamin C and vitamin C supplements (Synthetic Vitamins)?
Natural vitamins are derived directly from plant material containing the vitamin, not produced in a test tube. Many synthetic vitamins lack the transporters and co-factors associated with naturally-occurring vitamins because they have been “isolated.” The natural form come in packages with other vitamins, enzymes and minerals that control the way the body recognizes, metabolizes and uses them to make what it needs.
Isolated vitamins can’t always be used by the body, and are either stored until you obtain or create the nutrients required to use them effectively or are excreted. Synthetic vitamins are also devoid of necessary trace minerals and must use the body’s own mineral reserves which may lead to dangerous mineral deficiencies.

Does different amounts of vitamin c provide us with different amount of energy?
Current research does not support the ability of vitamin C supplements in increasing energy, but there is some speculation on the energy benefits of foods containing high amounts of the vitamin.
Published in the International Journal of Sports Medicine in 1997 written by authors Nieman et al, a study that compared immune response in marathon runners taking a 1,000 mg of vitamin C per day for eight days versus those taking a placebo for the same amount of time. According to blood tests drawn six hours after a two and a half hour treadmill ride no difference was found in between the groups. This research concluded that vitamin C has not proven to increase energy levels or performance in these marathon participants.

Does vitamin C benefit certain people and helps their conditions?
People with diabetes benefit from extra vitamin C. This nutrient can help regulate blood sugar levels. Since insulin helps vitamin C, as well as glucose, get into cells, people with diabetes may not have enough vitamin C inside many of their cells. Just like glucose, vitamin C can't do its work if it's not inside of a cell. Supplementing vitamin C can force it into body cells, where it can protect against the many complications of diabetes.

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