I used alpha glucosidase enzyme (2Unit/ml), p-Nitrophenyl beta-D-glucopyranoside (PNPG)(5mM) as a substrate and reaction stopper as sodium carbonate (1M) and 50mM phosphate buffer at pH 6.8. Unfortunately I didn't find any colour change, I mean any reaction. Could anyone give me any suggestion how can I get result from this assay. 

Unfortunately I bought p-Nitrophenyl beta-D-glucopyranoside substrate, can anyone tell me is that a big issue for reaction with alpha enzyme with beta substrate?

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