Subject: A test that can give the concentration of aspartame after hydrolysis?

I am asking this question as I am doing my chemistry A-level coursework. I 
am looking at what's in aspartame. This includes investigating the best 
conditions needed for the hydrolysis of the peptide bonds, by changing the 
concentration of acid and reflux time. Once the aspartame has been 
hydrolysed I have preformed paper chromatography to look at what is 
present in the solvent by comparing it with aspartic acid and 
phenylalanine. I would also like to find the concentration of solvent 
present. So I was thinking of preforming a titration but I did not know 
with what as I will try one thing and it will react with one of the other 
prodcuts. (methanol,aspartic acid or phenylalanine) I thought that the 
best product that would be able to give me a concentration would be 
methanol as it would be hard to find something that would not react with 
both the amino acids present? I would be very grateful if you could help 
me as soon as possible as both my teacher and I have been trying to think 
of a way to find the concentration for quite a while.( I am doing the 
Salters A-level course(MOD 5B,Syllabus 5688 OCR) and my experiment is 
based on the subject topic engineering proteins experiment EP2.2 )

Re: A test that can give the concentration of aspartame after hydrolysis?