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Preparation of Extract
The Ultrafiltration of Purified Enzyme
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100 per cent 12 membrane a-Amylose acetic acid Activity expressed adsorbed adsorption alcohol ammonium sulfate amount of enzyme amounts of ethylene average deviation biuret branes buffered to pH calcium chloride cent by volume centrifuged Chem collodion Columbia University concentration of nitrocellulose conditions described Congo Red contain active enzyme control enzyme solutions Cu2O cuprous oxide dialysis diastatic activity diffusion dry weight egg albumin enzyme activity ethylene glycol evaporation expressed as mg extract prepared filtered filtrate contain active filtrate showed given in Table grade 18 grade 8 membranes grade 9 GRADED NITROCELLULOSE MEM H. C. Sherman humidity invertase loss of activity M. D. Schlesinger malt amylase malt extract Membranes of grade MEMBRANES Weights minutes nitrocellulose membranes Organo Original Extract Filtrates pH value Pierce.7 portion of filtrate precipitate protein residue Sherman and M. D. showed no activity showed no enzymic sodium acetate solid content solvent tained tion trates turbid ultrafiltration weight Wet Weight