Eat Your Broccoli?: What Happens to the Vitamin C Content in Broccoli When it is Cooked? By Alex Kattan How does cooking broccoli affect its vitamin C content? Broccoli has a very high vitamin C content. Bar Graphs (Boiled Broccoli) Bar Graphs (Steamed Broccoli) Line Graph (Boiled) Line Graph (Steamed Broccoli) Boiling Experiment Observations

Large change in results for 8 minutes. Steaming Experiment Observations

Results stayed approximately the same

Vitamin C content stayed constant for various steaming times (2-8 min)

Vitamin C content decreased as boiling times increased (2-8 min) Conclusion

Hypothesis was partially correct Conclusions THANK YOU! Bibliography

http://www.produceoasis.com/Items_folder/Vegetables/Broccoli.html

http://www.choose-healthy-food.com/cooking-food.html

http://www.thefreedictionary.com/indicator

http://www.thefreedictionary.com/titration

http://www.fitday.com/fitness-articles/nutrition/vitamins-minerals/vitamin-c-why-its-important.html

http://www.medicalnewstoday.com/articles/155758.php

http://www.ayurvediccure.com/health/importance-of-vitamin-c/ Materials Procedure Blender Medicine Dropper Boiling Pot Electronic

Scale Timer Measuring Cup Starch-Iodine Indicator Making the vitamin C solution (control) Indicator turned clear after one drop

of the solution Cut broccoli Weigh 10g of broccoli Put broccoli in boiling

pot to boil for 2-8 min Put broccoli and 200 mL

water in blender Blend broccoli for 60 sec Pour broccoli through strainer into bowl More cooking time = Less vitamin C Fill medicine dropper with liquefied broccoli Count number of drops of liquefied broccoli needed to make indicator clear Steam broccoli and repeat procedure Boiled Broccoli Results How much liquefied broccoli (boiled for 2 Minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (boiled for 2 Minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (boiled for 4 Minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (boiled for 4 Minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (boiled for 6 Minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (boiled for 6 Minutes) was needed to make the starch-iodine indicator turn clear? Steamed Broccoli Results How much liquefied broccoli (steamed for 2 minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (steamed for 2 minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (steamed for 4 minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (steamed for 4 minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (steamed for 6 minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (steamed for 6 minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (steamed for 8 minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (steamed for 8 minutes) was needed to make the starch-iodine indicator turn clear? 1.70 mL Straw Broccoli Steaming Pot 1.84 mL 1.98 mL How much liquefied broccoli (boiled for 8 Minutes) was needed to make the starch-iodine indicator turn clear? How much liquefied broccoli (boiled for 8 Minutes) was needed to make the starch-iodine indicator turn clear? 2.54 mL 1.07 mL 1.10 mL 1.03 mL 1.00 mL Boiled Broccoli Data Boiled Broccoli Mean, Median, Mode, and Range. Steamed Broccoli Data Steamed Broccoli Mean, Median, Mode, And Range. Question Background Research Hypothesis Steaming is a healthier method of cooking broccoli than boiling.

Longer boiling periods greatly reduce the vitamin C content. > Significant outlier at 8 minutes (2.54 mL) No significant outliers observed Slope Unit: mL of Lieuquefied Broccoli/Time (min) Slope Unit: mL of Lieuquefied Broccoli/Time (min) Percent Change

If boiling time increases by 300% then the mL of broccoli is increased by 49.41% Meaning of the slope (boiled)

2-4 min = + 0.14 mL Meaning of the slope (steamed)

2-4 min = + 1.07 mL Boiling Experiment Predictions

4 minutes: Y = 1.846 mL (Proven)

9 minutes: Y = 2.716 mL (Unproven) Slope Equation (boiled)

Y = 0.174(X) + 1.15 Slope Equation (steamed)

Y = -0.02(X) + 1.14 Steaming Predictions

4 minutes: Y = 1.06 mL (Proven)

9 minutes: Y = 0.96 mL (Unproven) Observations Analysis

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# Eat Your Broccoli?: What happens to the Vitamin C content in broccoli when it is cooked?

Alex Kattan's Form II Math-Science Presentation

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