Why was the volume of ABTS+˙ kept constant in each sample for the assay? What was the one substance whose amount changed for each sample in the assay? • What is the purpose of taking a control sample? • After each pair has made a plot of [ABTS·+] remaining in solution vs. volume of berry solution, begin to compare across the berries. What are the differences and similarities for each plot? What piece of information from the plot gives you information about the antioxidant efficiency of each berry? After accounting for the amount of each berry, can you rank the berries in order of antioxidant efficiency?