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Are Dark Green leafy veggies higher in Vitamin C than lighter leafy greens?
Are Dark Green leafy veggies higher in Vitamin C than lighter leafy greens?
Hypothesis
It is hypothesized that dark leafy greens have more nutritional value than lighter leafy greens due to their darker pigment. The lighter greens contain more water and less chlorophyll.
Materials
-Dark Green, Leafy Veggies (Spinach, Broccoli)
-Light Green Veggies (Iceberg Lettuce, Light Green Cabbage or Brussel Sprouts)
-Cornstarch
-Iodine
-Water
-Beaker (if you are going to use a burner); Pot (if you are going to use a stove)
-Bunsen Burner (or a stove)
-Blender (assistance from an adult)
-Strainer
-Eyedropper/pipette
-Several test tubes w/ rack
-A white piece of paper
-Pen for taking notes
Safety
When using a blender, caution was taken with the blades and the power outlet with water. to prevent any injuries. Assistance was required
fair test
Variables
Independent
The type of leafy green (dark or light leafy vegetables)
Dependent
which leafy green contains the most Vitamin C?
Controlled
The amount of iodine solution used
The liquid vegetable solution
method
Preparing the vegetables
Step 1: Since the vegetables were solid, they were turned into liquid first before using the indicator solution on it
Step 2: Each vegetable was put into a blender (blender was rinsed after each pulp to prevent contamination of results)
Step 3: Juices were strained and kept covered aside
Preparing the iodine indicator
Step1: One tbsp of cornstarch was added together with water to make a paste
Step 2: 250ml of water was boiled for 5 mins
Step 3: 10 drops of the boiled solution was added to 75ml of water using a dropper
Step 4: Iodine was added to the mixture until it turned a dark-purple colour
Testing the vegetables
Step 1: With a dropper, 5ml of the iodine indicator solution was added to a standard 15ml test tube. Using a clean dropper (to prevent contamination), 10 drops of the juice was added into the test tube
Step 2: the dropper was cleaned and the above was done for each juice sample
Step 3: The test tubes were compared on which turns a darker colour. The darkest test tube means that it has the least Vitamin C present in the particular test tube
Result
Conclusion
Evaluation
Strengths
weaknesses
vitamin c
Vitamin C is required for the biosynthesis of collagen, L-carnitine, and certain neurotransmitters; vitamin C is also involved in protein metabolism
Amount of Vitamin C:
Spinach: 28mg
Kale: 120mg
Lettuce: 9mg
iceberg: 2.8 mg