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Influence of the extent of disruption of Bakers’ yeast on protein adsorption in expanded beds

Paper ID Volume ID Publish Year Pages File Format Full-Text
24812 43538 2008 10 PDF Available
Title
Influence of the extent of disruption of Bakers’ yeast on protein adsorption in expanded beds
Abstract

Expanded bed adsorption chromatography is used to capture the protein product of interest from a crude biological suspension directly, thereby eliminating the need for the removal of the cell debris. While this technique may replace three or four unit operations in a typical downstream process for biological product recovery, the adsorption process is influenced by the interaction between the microbial cells or cell debris and the adsorbent as well as the presence of contaminating solutes. The influence of the extent and nature of disruption of Bakers’ yeast on the adsorption of the total soluble protein and α-glucosidase was investigated in this study. Two different techniques were used for cell disruption: high pressure homogenisation and hydrodynamic cavitation. Two different adsorbents were chosen: anionic Streamline DEAE and cationic Streamline SP. The settled bed height and the superficial velocity were constant across all experiments. The feedstock was characterised in terms of viscosity, pH, conductivity, particle size distribution of the cell debris and the extent of protein and α-glucosidase released. The performance of the adsorption process was found to be influenced by the electrostatic interactions of cell debris with the anionic adsorbent Streamline DEAE and the intraparticle diffusional resistance inside the pores of the adsorbent matrix. The increase in the intensity of disruption resulted in an increase in the dynamic binding capacity (10% feed) of both the total soluble protein and the α-glucosidase. However, the increase in the DBC of protein and α-glucosidase were not proportional. The amount of protein that could be adsorbed per ml of adsorbent from the samples subjected to a lower intensity of disruption was found to exceed that obtained at a higher disruption intensity on increasing the volume of feed suggesting multilayer adsorption. In this case, selective adsorption of the model protein α-glucosidase was reduced, illustrating the compromise of maximising protein recovery through non-specific binding. The study illustrates the need for an interrogation of the intensity of disruption needed and a rigorous understanding of the influence of cell debris and adsorbent—protein interaction, in optimising the selective recovery of intracellular products by EBA.

Keywords
DBC, dynamic binding capacity; dpmax, maximum particle diameter; dpmin, minimum particle diameter; FDH, formate dehydrodygenase; HC, hydrodynamic cavitation; HPH, high pressure homogenisation; AG, α-glucosidase; RTD, residence time distribution; C, concen
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Influence of the extent of disruption of Bakers’ yeast on protein adsorption in expanded beds
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 133, Issue 3, 1 February 2008, Pages 360–369
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us