Isolasi enzim sukrosafosforilase rekombinan dari bakteri Escherichia coli BL-21StarTM dan esei aktivitas transglikosilasi terhadap asam askorbat dan asam benzoat = Isolation of recombinant sucrose phosphorylase enzyme from Escherichia coli BL-21 StarTM and Its transglycosylation activity assay using ascorbic acid and benzoic acid as substrate