>Does anybody know how to inhibit amylase completely in combination with >keeping the >sample matrix intact? How does pH affect ESR?! Amylase is virtually inactive at a pH of 4 or less or one of 9.5 or above, but it may be of sufficiently low activity at a less extreme pH. Also, I think some substituted starches are less prone to amylase digestion. Reza Morovat ------ACB discussion List Information-------- This is an open discussion list for the academic and clinical community working in clinical biochemistry. Please note, archived messages are public and can be viewed via the internet. Views expressed are those of the individual and they are responsible for all message content. ACB Web Site http://www.acb.org.uk List Archives http://www.jiscmail.ac.uk/lists/ACB-CLIN-CHEM-GEN.html List Instructions (How to leave etc.) http://www.jiscmail.ac.uk/