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. 2013 Jul 23;8(10):e25681. doi: 10.4161/psb.25681

Table 2. Enrichment in Pectin methylesterase activity after different steps of purification.

Purification steps Activity (units/ml) Protein (mg/ml) Specific Activity
(U/mg)
Purification Factor
Crude 250 2.41 103.7 1.00
Ammonium Sulfate ppt. 380 3.43 110.7 1.06
Ion exchange 290 0.44 1517.0 14.00
Gel filtration 178 0.06 2617.0 25.23