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- W172484142 abstract "A simple, rapid, highly sensitive and reproducible fluorimetric assay for angiotensin-converting enzyme in untreated serum using the natural substrate based on a similar assay with hippuryi-L-histidine-L-leucine is described.9 Angiotensin I (0.2 mM in 0.1 M potassium phosphate–30 mM NaCl,pH 7.5; 37 C) is converted to angiotensin II and L-histidyl-Lleucine, which is quantified fluorimetrically (excitation = 360 nm; fluorescence, 500 nm) by formation of a fluorescent adduct with o-phthaldialdehyde. L-Histidyl-L-leucine peptidase was also monitored in order to correct for significant activity, which was observed only once, in less than 1% of sera. The mean value of serum angiotensin-converting enzyme in sera from 45 normal subjects was 4.69 ± 0.194 (SEM) ± 1.30 (SD) nmol/ min/ml serum, compared with 31.7 ± 1.53 (SEM) ± 10.3 (SD) with the substrate analog hippuryl-L-histidine-L-leucine. There was a high degee of correlation between the velocity of cleavage of angiotensin I and hippuryl-L-histidyl-L-leucine (r = 0.903 to 0.993). The assay of serum angiotensin-converting enzyme is of use in the diagnosis and possible management of sarcoidosis and Gaucher’s disease, and may have other applications." @default.
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- W172484142 title "Sensitive Fluorimetric Assay for Serum Angiotensin-converting Enzyme with the Natural Substrate Angiotensin I" @default.
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- W172484142 doi "https://doi.org/10.1093/ajcp/68.2.225" @default.
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