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- W1974597352 abstract "Cholecystokinin is a gastrointestinal and neuropeptide which has been implicated in a wide range of physiological and behavioral processes. We have developed a sensitive and specific assay system to measure the various forms of cholecystokinin (CCK) in human plasma. This 3-step system involves i) extraction of CCK fragments from plasma using reverse phase chromatography; ii) separation of peptides by high performance liquid chromatography; and iii) detection and quantification of peptides with a double-antibody radioimmunoassay, using an antibody raised against cholecystokinin tetrapeptide (CCK-4) coupled to thyroglobulin and 125I Bolton-Hunter CCK-4 as tracer. The antibody detects CCK-4, sulfated CCK-8 (CCK-8S) and nonsulfated CCK-8 (CCK-8ns) with equal affinity. The lower limit of detection is 2.7 fmol, with an ED50 of 10.6 +/- 2.2 fmol. Mean CCK-like immunoreactivity (CCK-LI) in the plasma of 12 healthy subjects was determined to be 12.9 +/- 2.1 pM CCK-4 equivalents. Concentrations of each individual peptide in plasma were determined to be 1.0 +/- 0.2 pM, 3.4 +/- 0.8 pM and 1.9 +/- 0.4 pM for CCK-4, CCK-8s and CCK-8ns respectively." @default.
- W1974597352 created "2016-06-24" @default.
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- W1974597352 date "1997-01-01" @default.
- W1974597352 modified "2023-09-30" @default.
- W1974597352 title "Development of A Sensitive and Specific Assay System for Cholecystokinin Tetrapeptide" @default.
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- W1974597352 doi "https://doi.org/10.1016/s0196-9781(97)00007-7" @default.
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