recrystallization:Dissolve crystals obtained in step on in distilled water at room temperature to create a solution of protein concentration of about 1%. Then let in slowly (at the same time stir) dung dich NaCl storm dime (10 ml/300 ml solution of protein). When 75% of the volume of solution NaCl gave in, papain started crystallizes at room temperature. Translate suspension kept in 40 c overnight, then cold centrifuge 2500 RPM in 4-5 hours of receipt. The private activities of enzymes might marginally increase if conducted recrystallized more again as above.To increase enzyme activity, before recrystallization can dissolve crystals papain in phosphate buffer solution contains cysteine, then proceed to Super filter with filter diaphragm 4000A0 and provide the essential liquid obtained after ultrafiltration. vacuum DryingVacuum drying at a temperature of 400 c acquisition of papain.
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