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Evaluation of an immunoaffinity extraction column for enrichment of adducts between human serum albumin and hexahydrophthalic anhydride in plasma
Author(s) -
Johannesson Gunvor A.,
Kristiansson Monica H.,
Jönsson Bo A. G.,
Lindh Christian H.
Publication year - 2008
Publication title -
biomedical chromatography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 65
eISSN - 1099-0801
pISSN - 0269-3879
DOI - 10.1002/bmc.936
Subject(s) - chemistry , chromatography , sepharose , affinity chromatography , albumin , elution , conjugate , adduct , serum albumin , extraction (chemistry) , biochemistry , enzyme , organic chemistry , mathematical analysis , mathematics
An immunoaffinity extraction (IAE) column was prepared for extraction of adducts between human serum albumin (HSA) and hexahydrophthalic anhydride (HHPA). HHPA is a strong sensitizer inducing immunoglobulin E antibodies in vivo . Polyclonal antibodies from a rabbit immunized with keyhole limpet hemocyananin–HHPA conjugate were purified using a Protein A Sepharose gel. To obtain antibodies with optimal affinity towards HHPA–protein adducts, HHPA‐specific antibodies were selected using an N ‐hydroxysuccinimide–Sepharose column coupled with albumin–HHPA conjugate. Antibodies eluted from this column at pH 2.2 were selected to prepare the IAE column. The column was evaluated using 2 mL plasma spiked with HSA–HHPA conjugate. The column was eluted with glycine buffer at pH 2.0. The conjugates in the eluate were hydrolyzed to the corresponding HHP acid and quantified by mass spectrometry. The average recovery of HHPA adducts in 11 experiments was 68% with a coefficient of variation (CV) of 7%. The column's capacity to bind protein–HHPA adducts was found to be linear in the range of 0.15–1.2 nmol conjugate. The evaluation showed that the IAE column had adequate affinity towards the HHPA adducts and that the adducts could be extracted with good recovery and precision from a large volume of plasma. Copyright © 2007 John Wiley & Sons, Ltd.