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- W1987202495 abstract "Abstract An adsorption technique with polydimethylsiloxane-coated glass beads (PDMS-GB) was developed to determine the protein binding of a highly lipophilic and hydrophobic drug. The present assay method is based on the quantitative adsorption of unbound drug to the PDMS-GB. This method of batch separation in a glass assay tube has an advantage of simplicity and rapidity. To evaluate the reliability of PDMS-GB assay, we compared the protein binding of diazepam in serum in-vitro measured by ultrafiltration and PDMS-GB assay. There was no significant difference between the extent of binding measured by each method. Using PDMS-GB assay, we determined the protein binding of the prostaglandin I2 (PGI2) analogue isocarbacyclin methyl ester (TEI-9090), whose binding cannot be measured by commonly employed techniques (equilibrium dialysis, ultrafiltration, gel filtration or ultracentrifugation) because of a high degree of adsorption to membranes, resins or tubes. The percentage of TEI-9090 bound in human serum, 4% human serum albumin (HSA, fatty acid-free) and dog serum were ∼98, ∼87 and ∼95%, respectively, and these values were independent of TEI-9090 concentration up to 10 ng mL−1. The binding of isocarbacyclin (TEI-7165) to serum protein in man, dogs, rabbits and rats, determined by ultrafiltration, was also high (>90%). While the displacement of TEI-9090 and TEI-7165 binding to HSA by aspirin, salicylic acid and indomethacin was not observed, clofibric acid and free fatty acids significantly inhibited the protein binding of both compounds. These results indicate that the binding site of TEI-9090 and TEI-7165 on HSA could be identical with the possible binding site of PGI2." @default.
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- W1987202495 date "1994-10-01" @default.
- W1987202495 modified "2023-09-23" @default.
- W1987202495 title "Determination of Protein Binding of a Highly Lipophilic Drug, Isocarbacyclin Methyl Ester (TEI-9090), Using a Polydimethylsiloxane-coated Glass Beads Assay" @default.
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- W1987202495 doi "https://doi.org/10.1111/j.2042-7158.1994.tb03740.x" @default.
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