Vitamin C (Ascorbic Acid), Grapefruits, and Me
CSEF · 2007 Biochemistry/ Molecular Biology
Overview
Objectives/Goals How does shelf life affect the amount of Vitamin C (Ascorbic Acid) in grapefruits? Will there be more, less, or the same amount of Vitamin C in a grapefruit that has been sitting on a shelf for one to four weeks opposed to a freshly picked grapefruit? Methods/Materials Two identical grapefruit trees in the same location and with the same sized fruit. A black marker-for labeling, Ascorbic Acid Titrant-118Ml(4 oz)MDB*; Sulfuric Acid Standard Solution,5.25N-118Ml(4 oz)MDB*; Starch Indicator Solution-118Ml(4 oz)MDB*; Erlenmeyer Flask, 125 Ml; Centrifuge Tube, 15Ml, polystyrene; Demineralized water; MDB*: Marked Dropping Bottle Results TESTING DATE-2/18/07 (The grapefruits were picked on the date shown) The results were: 1/14/07 - 48 drops of Ascorbic Acid Titrant(AAT)in Tree A's solution/43 drops into Tree B's. 1/18/07 - 39 drops of AAT into Tree A's solution/36 drops into Tree B's. 1/21/07 - 37 drops of AAT into Tree A's solution/35 drops into Tree B's. 1/25/07 - 36 drops of AAT into Tree A's solution/35 drops into Tree B's. 1/28/07 - 36 drops of AAT into Tree A's solution/33 drops into Tree B's. 2/1/07 - 41 drops of AAT into Tree A's solution/26 drops into Tree B's. 2/4/07 - 36 drops of AAT into Tree A's solution/30 drops into Tree B's. 2/08/07 - 31 drops of AAT into Tree A's solution/22 drops into Tree B's. 2/11/07 - 27 drops of AAT into Tree A's solution/17 drops into Tree B's. 2/15/07 - 20 drops of AAT into Tree A's solution/19 drops into Tree B's. 02/18/07 - 8 drops of AAT into Tree A's solution/4 drops into Tree B's. Conclusions/Discussion The research, data, and experiment results, proved my hypothesis to be correct!The grapefruits picked 4 weeks ago had less Vitamin C than those freshly picked.
Summary statement
The purpose of this experiment is to figure out if a shelved grapefruit is better for your body than a freshly picked grapefruit.
Help received
Mother helped with taking the pictures and putting the pictures and headings on the board.
Competition history
- CSEF 2007
Resources
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