Better method for deglycosylation..?

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Dear Netters..

What would be the best way to cleave and recover only protein

from complex glycoprotein ? This glycoprotein is isolated 

from plant and seem to be heavily glycosylated. It is not

that easy as it first seemed since I've already tried several

well-known methods.

Could anyone tell me some 'powerful method' as a solution..?

And also please let me know the reference of the method.


Thank you so much.