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Thermoresponsive Agarose Based Microparticles for Antibody Separation

Thermoresponsive Agarose Based Microparticles for Antibody Separation
Autor:

Ooi, H.W. / Ketterer, B. / Trouillet, V. / Franzreb, M. / Barner-Kollwollik, C. (2015)

 

Quelle:

Biomacromolecules, (2015), DOI:10.1021/acs.biomac.5b01391

Datum: Dezember 2015

Abstract

We report the development of thermoresponsive 4-mercaptoethylpyridine (MEP)-based chromatographic microsphere based resins for antibody separation that show switchable release abilities by adsorbing immunoglobulins at 40 °C and releasing the proteins at 5°C. The thermoswitchable release properties were introduced to the porous resins by the grafting of linear poly (N-isopropylacrylamide) (PNIPAM) chains synthesized via reversible addition−fragmentation chain transfer (RAFT) polymerization, which were modified to possess MEP end functionalities.
Adsorption of γ-globulins as a model antibody on the shortest PNIPAM-MEP (3 kDa) grafted microparticles display binding capacities of up to 20 g L − 1 at 40 °C and a significant decrease in binding capacity to less than 2.5 g L − 1 at 5 °C.
By switching the temperature to 5 °C, the release of bound γ-globulins is shown to be as high as 90%. The effects of polymer chainlength on the binding capacity are studied in detail and found to be critical as they influence the density of MEP functionalities on the particle surfaces.
 

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