Abstract
1. Characters of serum and erythrocytes Cholinesterase (ChE) of human female, using Benzoylcholina Chloride (BzCh) for serum and Acetyl-β-methylcholine Chloride (MeCh) for erythrocytes ChE as substrate, were studied manometrically.
2. Serum ChE displayed its optimum activity at 10-2.5 M of BzCh, and erythracytes ChE at 10-1 M of MeCh. The activity-pS curves for the enzymic hydrolysis of BzCh and MeCh were different.
3. Activities of serum and erythrocytes ChE were increaes paralleled with the dose increased and the time elapsed.
4. The mean of activity of 0.1 ml serum ChE and erythrocytes ChE in 0.1 ml blood was 86.2 and 104.9/CO2/mm3/30' respectively. Remarkable individuality of activities were found in both of them, especially in erythrocytes ChE.
5. The distribution ratio of ChE of serum and erythrocytes in blood were nearly 1 to 2.
