A level hydrolyis aspartame practical

Hi, I don't know if anyone has any tricks or tips of the hydrolysis of aspartame practical where you reflux it with acid until it hydrolyses, we can't seem to get it to show up in the chromatography stage, the amino acids don't show for it when we spray it with ninhydrin. We've tried 6mol hcl and we use canderell. Im not a chemist so I'm hoping I'd find help here. Many thanks
 
Hi, I don't know if anyone has any tricks or tips of the hydrolysis of aspartame practical where you reflux it with acid until it hydrolyses, we can't seem to get it to show up in the chromatography stage, the amino acids don't show for it when we spray it with ninhydrin. We've tried 6mol hcl and we use canderell. Im not a chemist so I'm hoping I'd find help here. Many thanks
What are you using as the mobile phase?
 
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