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Hydrodynamic Characteristics and Adsorption Particularity of Nanobiological Feedstock Along the Bed Height in a Novel Chromatography Column

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Abstract

Expanded bed adsorption (EBA) is a practical method for the separation of nanoparticulates. In order to analysis the local hydrodynamic and adsorption behavior of nanoparticle (NP)-based biological feedstock, a modified Nano Biotechnology Group EBA column with a 26-mm inner diameter was used to withdraw liquid from different axial positions of the column. Fabricated egg albumin (EA) NPs with an average size of 70 nm were employed as a model system and viral size/charge mimic to assess the relationship between hydrodynamic and adsorption performance of NPs at the different column regions. The effects of influential factors, including flow velocity and initial concentration of NPs, on NP hydrodynamic behavior and adsorption kinetics along the bed height were investigated. NP hydrodynamic studies confirmed that non-uniform behavior dominated the system and a decreasing trend of liquid mixing/dispersion with increase of bed height was observed in this column. The results demonstrated an increase in the mixing/dispersion at certain bed heights with the increase in both the velocity and feed initial concentration. Breakthrough curves were measured at various column points to determine the adsorption performance [dynamic binding capacity (DBC) and yield] in different bed positions/zones. Yield and DBC of NPs were improved along the bed height, whereas liquid velocity had the opposite effect. Increasing the initial concentration of NPs enhanced only the DBC. Separation of EA NPs under optimal conditions was 87 %, which is an excellent result for a one-pass frontal chromatography method.

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Abbreviations

B o :

Bodenstein number

C :

Exit concentration of NPs in bed effluent (kg m−3)

C o :

Initial concentration of NPs (kg m−3)

C 9 :

Exit concentration that has left the 9-cm sample port and is measured at this port (kg m−3)

C 12 :

Exit concentration that has left the 12-cm sample port and is measured at this port (kg m−3)

D axl :

Axial dispersion coefficient (m2 s−1)

H :

Bed height (m)

H sb :

Settled bed height (m)

h :

Axial bed height (m)

N :

Theoretical plate

\( \bar{t} \) :

Residence time (s)

U :

Superficial flow velocity (m s−1)

V f,9 :

Volume of feed loaded onto the column until C 9 reaches a certain degree of NP breakthrough (m3)

V f,12 :

Volume of feed loaded onto the column until C 12 reaches a certain degree of NP breakthrough (m3)

V l :

Liquid volume above the particles in the sampling syringe (m3)

V L,0–9 :

Liquid volume present in the bed voidage for the 0- to 9-cm column zone (m3)

V L,0–12 :

Liquid volume present in the bed voidage for the 0- to 12-cm column zone (m3)

V s,0–9 :

Settled volume of adsorbent in the 0- to 9-cm column zone (m3)

V s,9–12 :

Settled volume of adsorbent in the 9- to 12-cm column zone (m3)

V o :

Volume of the particles in the sampling syringe (m3)

ε:

Bed voidage

ε i :

Local bed voidage at ith layer of bed

δ:

Variance (s)

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Acknowledgments

The authors would like to gratefully acknowledge members of the Nanotechnology Research Institute of Babol University of Technology, Babol, Iran.

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Authors and Affiliations

  1. Nanotechnology Research Institute, Faculty of Chemical Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran

    Mohsen Jahanshahi & Elham Sadat Taheri Otaghsara

  2. Faculty of Chemical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

    Mohammad Taghi Hamed Mosavian

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  1. Mohsen Jahanshahi
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  2. Mohammad Taghi Hamed Mosavian
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  3. Elham Sadat Taheri Otaghsara
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Correspondence to Mohsen Jahanshahi.

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Jahanshahi, M., Mosavian, M.T.H. & Otaghsara, E.S.T. Hydrodynamic Characteristics and Adsorption Particularity of Nanobiological Feedstock Along the Bed Height in a Novel Chromatography Column. Chromatographia 75, 585–596 (2012). https://doi.org/10.1007/s10337-012-2235-3

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