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• W1966314215 endingPage "2362" @default.
• W1966314215 startingPage "2355" @default.
• W1966314215 abstract "Poly(ethylene glycol) (PEG) is increasingly used in clinical and experimental medicine. However, quantification of PEG and PEGylated small molecules remains laborious and unsatisfactory. In this report, we stably expressed a functional anti-PEG antibody on the surface of BALB 3T3 cells (3T3/alphaPEG cells) to develop a competitive enzyme-linked immunosorbent assay (ELISA) for PEG quantification. The alphaPEG cell-coated plate bound biotinylated PEG(5K) (CH(3)-PEG(5K)-biotin) and CH(3)-PEG(5K)-(131)I more effectively than did a traditional anti-PEG antibody-coated plate. Competitive binding between PEG (2, 5, 10, or 20 kDa) and a known amount of CH(3)-PEG(5K)-biotin allowed construction of a reproducible competition curve. The alphaPEG cell-based competition ELISA measured small molecules derivatized by PEG(2K), PEG(5K), PEG(10K), PEG(20K), and PEG(5K) at concentrations as low as 58.6, 14.6, 3.7, 3.7, and 14.6 ng/mL, respectively. Notably, the presence of serum or bovine serum albumin enhanced PEG measurement by the alphaPEG cell-based competition ELISA. Finally, we show here that the alphaPEG cell-based competition ELISA accurately delineated the pharmacokinetics of PEG(5K), comparable to those determined by direct measurement of radioactivity in blood after intravenous injection of CH(3)-PEG(5K)-(131)I into mice. This quantitative strategy may provide a simple and sensitive method for quantifying PEG and PEGylated small molecules in vivo." @default.
• W1966314215 created "2016-06-24" @default.
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• W1966314215 date "2010-02-23" @default.
• W1966314215 modified "2023-10-18" @default.
• W1966314215 title "Measurement of Poly(ethylene glycol) by Cell-Based Anti-poly(ethylene glycol) ELISA" @default.
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• W1966314215 doi "https://doi.org/10.1021/ac902548m" @default.
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