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. 2011 Apr 4;49(1):79–84. doi: 10.1016/j.ijbiomac.2011.03.018

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Copyright © 2011 Elsevier B.V.

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Fig. 2 — (A) pH profiles of ACE. The optimal pH ACE activity was assayed using Abz-SPY(NO2) as substrate in buffers with pH ranging from 4.0 at 9.0. (B) Effect of NaCl on the activity ACE2. The influence of Cl⁻ on ACE2 activity was determined using Abz-SPY(NO2) as substrate in buffer with NaCl concentrations ranging from 50 to 1500 mM.