Antibody-based assay for galacturonan deesterification on wood pulp fibers during bleaching |
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Authors: | Jonas Hafrén |
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Institution: | (1) Department of Wood Science, Swedish University of Agricultural Sciences, Wood Ultrastructure Research Centre (WURC), PO Box 7008, Uppsala, SE-750 07, Sweden |
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Abstract: | Antibodies recognizing galacturonan were used in immunoassays for industrial unbleached and hydrogen peroxide-bleached chemithermomechanical
pulp (CTMP). The assays were based on a colorimetric method using specific monoclonal antibody recognition of acidic and methylated
homogalacturonan, respectively, on the pulp fiber surfaces. Alkaline phosphatase-conjugated antibodies were linked to the
galacturonan specific antibodies, and an alkaline phosphatase substrate (p-nitrophenylphosphate) was used to develop a yellow reaction product that can be followed spectrophotometrically. Together
the newly developed immunoassays were able to describe the deesterification, specifically, of surface-localized galacturonan
on CTMP, induced by alkaline hydrogen peroxide bleaching. Unbleached CTMP showed relatively more labeling by methylated galacturonan
recognizing antibodies, whereas bleached CTMP was relatively more labeled for acidic galacturonan. The increase in negative
charge of the bleached pulp was also shown by polyelectrolyte titration; the negative surface charge was 9.3 μeq g−1 in unbleached CTMP and 21.7 μeq g−1 in bleached pulp. |
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Keywords: | Charge Chemithermomechanical pulping Immunoassay Pectin |
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