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- W2000698258 abstract "During the scale-up of an ultrafiltration/diafiltration (UF/DF) step for a protein-based conjugate vaccine, significant precipitation was observed at room temperature. It was found that a specific type of metal hosebarb fitting used in the UF/DF system, when placed in the conjugate solution, caused the precipitation. Inductively Coupled Plasma Mass Spectrometry analysis showed significant amounts of Ni(II), Zn(II), and Cu(II) present in the conjugate solution. A kinetic study showed that the concentration of these metal ions gradually increased with increasing incubation time with a corresponding decrease in conjugate concentration. Direct spiking of trace amounts of NiCl₂, ZnCl₂, and CuCl₂ into the conjugate solution also caused precipitation, and spiking studies showed that the metal ions caused precipitation of the conjugate but not of the carrier protein, antigen, or carrier protein + linker. The precipitation was found to be significantly dependent on buffer species but not solution pH and led to an irreversible loss of tertiary structure even after dissolution in and removal of guanidine hydrochloride. The precipitation is likely the result of formation of transition-metal complexes with histidine residues on the antigen peptide, which may involve both intraconjugate and interconjugate antigens. Such complexation may lead to formation of multimers that may exceed the solubility limit." @default.
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- W2000698258 date "2012-08-01" @default.
- W2000698258 modified "2023-09-25" @default.
- W2000698258 title "Metal-Leachate-Induced Conjugate Protein Instability" @default.
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- W2000698258 doi "https://doi.org/10.1002/jps.23223" @default.
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