2. What is VitaminC?

3. VitaminC beautiful skin prevents ageing prevention cancer Virus activation prevention

4. Protecting power of oxidation Apple was oxidized

5. Using at foods Having strong power to deoxidize ⇒ It is used a protect oxidizer and a reducing agent. F o r e x a m p l e ・ ・ ・ O t h e r s … etc…

6. Research contents

7. How much VitaminC is contained? ? ?

9. VitaminC amount of fruit and vegetable Lemon, Lime Shikuwasa Daikon,Carrot, Apple Squeeze juice using a citrus squeezer. Mash them and squeeze.

10. Fruit juice ( 10 ml) into beakers HPO ₃ (10ml ) and KI (5 ml) into the beaker Starch (2 ml) into the beaker Adding a drop of KIO 3 to the beaker from burette Adding a drop then it changes color and goes back We measured again and again,and we considered the average result. When it can’t go back,it finish Procedure

11. KIO 3 ＋ 5KI ＋ 6HPO 3 → 3I 2 ＋ 6KPO 3 ＋ 3H 2 O ・・・① L-C 6 H 8 O 6 ＋ I 2 → L-C 6 H 6 O 6 ＋ 2HI ・・・② ①＋② ×3 KIO 3 ＋ 3L-C 6 H 8 O 6 ＋ 5KI ＋ 6HPO 3 → 3L-C 6 H 6 O 6 ＋ 6HI ＋ 6KPO 3 ＋ 3H 2 O Chemical reaction equation C 6 H 8 O 6 ［ mol ］ ＝ KIO ３［ mol ］ × ３ We can find concentration of vitaminC by volume and concentration of KIO ３.

12. The results and documented amounts

13. If it is true, In kiwi Documented amounts are bigger than our measurements of vitaminC. But measurement of kiwi is not bigger. It might be because of old kiwis Shikuwasa was also old, so its measurement might be less

14. The results and documented amounts

15. Before After I could not measure because Ascorbinase oxidizes Vitamin C. In apple

17. 2 Measure amount of VitaminC in heated apple Heating apple

18. But we couldn’t measure it … Vitamin C was destroyed by heating or microwaves Either the enzymes were not broken down or

19. The heating of the Vitamin C solution We heat the Vitamin C solution to check whether Vitamin C was broken by heating at second experiment. We measured amount of Vitamin C in there every 10 minutes until 30minutes passed.

20. The result and consideration The amount of dripped Potassium Iodate(KIO3) We think Vitamin C is not destroyed by heating over a short time. 0 minutes 20 minutes 10 minutes 30 minutes

21. The Influence of time and temperature on vitamin C Three Solutions of vitamin C keep under different conditions for three days. Measurement vitamin C content of them every other day Condition1 In refrigerator Condition2 At room temperature(10 ℃ ) Condition3 At high temperature(50 ℃ )

22. Measurement result at each vitaminC solution(10ml)

23. Our view The higher temperature we keep vitamin c on, the more vitamin c decreases. Vitamin c decrease on room temperature. So we can’t keep sample such as fruits, vegetables and solution of vitamin c. While vitamin c isn’t decomposed under high temperature for a short time, it is decomposed by keeping under low temperature for a long time.

24. Assignment from now on Finding how to get fixed juice Finding how to measure vitamin C content of apple Experiment different heating ways such as burning, boiling, steaming Measurement vitamin C content of heated fruits

25. Thank you