i want to reduce some prochiral ketones to corresponding alcohols using tomato as biocatalyst, after the mixture of tomato and carbonyl compound run for 50 hour, i was extracted it using ethyl acetate, sodium sulphate added to the organic layer and then evaporate solvent to get the product..the next step, i want to know about the change of functional group by IR and %ee by polarimeter. my question is, how to make sure that the product in good purity (single compound) in a sample before i introduce my reduced sample on IR and polarimeter instrument?? thk very much