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A method for the determination of angiotensin-converting enzyme in serum (S-ACE; EC 3.4.15.1.) with use of 3-(2-furylacryloyl)-L-phenylalanyl-glycyl-glycine (FAPGG) as substrate has been adapted for the Cobas Bio microcentrifugal analyser. The method allows 24 determinations per hour in a sample volume of 28 microliters with a within run precision of less than 3% and a between run precision of less than 5%. The reaction is linear up to at least 470 U/l. The reference interval in 92 blood donors has been determined to 14-110 U/l. The method correlates well with the manual method of Hurst & Lovell-Smith (r = 0.982). We have found the method excellently suited for routine assay.
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Johansen et al. (1987) studied this question.
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