title: Absolute quantitation of protein therapeutics in biological matrices by enzymatic digestion and LC-MS.
abstract: The advancement of biotechnology has led to an increase in biotherapeutic drugs, especially recombinant proteins and monoclonal antibodies. Ligand-binding assays or immunoassays are the standard methods of choice in pharmacokinetic studies in support of drug discovery and development for protein therapeutics. LC-MS-based methodologies are increasingly used as alternatives to immunoassays for absolute protein quantitation in biological samples. We review recent advancements in absolute quantitation of protein therapeutics in biological matrices by enzymatic digestion and LC-MS.
authors.affiliation: Covance Laboratories, Inc., Bioanalytical Chemistry, Madison, WI 53704, USA. fumin.li@covance.com
authors.forename: Fumin
authors.initials: F
authors.lastname: Li
authors.forename: Douglas
authors.initials: D
authors.lastname: Fast
authors.forename: Steve
authors.initials: S
authors.lastname: Michael
mesh_terms: D000818:Animals; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D047468:Immunoprecipitation; D013058:Mass Spectrometry / Q000379:methods*; D010455:Peptides / Q000032:analysis* / Q000097:blood; D004364:Pharmaceutical Preparations / Q000097:blood*; D011506:Proteins / Q000032:analysis*; D012015:Reference Standards; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction; D014357:Trypsin / Q000378:metabolism*
chemical_list: D010455:Peptides; D004364:Pharmaceutical Preparations; D011506:Proteins; D014357:Trypsin