Abstract
Chromatographic separation of prebiotic oligosaccharides, galacto-oligosaccharides from a typical post-reaction mixture containing unreacted substrate lactose and by-products glucose and galactose was investigated. A commercial cation-exchange resin Dowex 50WX4 was chosen as a prospective preparative-scale adsorbent and separation performance of its four ionic forms, H+, Na+, K+ and Ca2+, was tested. Since adsorption equilibrium isotherms were linear within the entire investigated range of concentrations, they were determined by pulse experiments for all saccharides present in a typical post reaction mixture including tri- and tetragalacto-oligosaccharides. From the four counter ions listed above, hydrogen offered the best selectivity and column performance. The selected H+-form of the cation exchanger was further investigated by means of frontal analysis where high ionic strength and elevated viscosity appear and can play a substantial role. Breakthrough curves were measured for monosaccharides, lactose, glucose–lactose mixture and a multicomponent commercial mixture of galacto-oligosaccharides, Vivinal® GOS. The breakthrough curves were successfully described by the dispersive plug flow model with linear driving force approximation.
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Abbreviations
- C 0,i :
-
Equilibrium liquid phase concentration component i (kg m−3)
- D a :
-
Axial dispersion coefficient (m2 s−1)
- D m,i :
-
Molecular diffusivity (m2 s−1)
- F :
-
Solid-liquid phase ratio (–)
- k h,i :
-
Mass transfer coefficients for the homogeneous particle (s−1)
- K i :
-
Adsorption equilibrium constant of component i (–)
- L :
-
Bed length (m)
- N i :
-
Plate number of component i (–)
- Pe :
-
Peclet number (–)
- Q :
-
Volumetric flow rate (m3 s−1)
- \( \bar{q}_{i} \) :
-
Average adsorbed solid-phase concentrations of the component i (kg m−3)
- \( q_{i}^{*} \) :
-
Equilibrium solid phase concentration
- R p :
-
Particle radius (m)
- t R :
-
Retention time (first statistical moment of peak) (s)
- t 0 :
-
Retention time of unretained tracer (s)
- u int :
-
Interstitial velocity (m s−1)
- V C :
-
Bed volume (m3)
- z :
-
Axial coordinate (m)
- α:
-
Selectivity (–)
- ε:
-
Bed voidage (–)
- σ2 :
-
Variance (s2)
- τ:
-
Tortuosity (–)
- Gal:
-
Galactose
- Glc:
-
Glucose
- Lac:
-
Lactose
- GOS3:
-
Galactotriose
- GOS4:
-
Galactotetraose
- GOS5:
-
Galactopentaose
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Acknowledgments
The authors would like kindly thank to FrieslandCampina for providing the Vivinal® GOS syrup. Carla Pereira gratefully acknowledges financial support from Fundação para a Ciência e a Tecnologia, Postdoctoral Research Fellowship SFRH/BPD/71358/2010. The Slovak side was partly supported by the grant of Slovak Agency for Science (VEGA 1/0531/13).
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Wiśniewski, Ł., Pereira, C.S.M., Polakovič, M. et al. Chromatographic separation of prebiotic oligosaccharides. Case study: separation of galacto-oligosaccharides on a cation exchanger. Adsorption 20, 483–492 (2014). https://doi.org/10.1007/s10450-013-9587-3
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DOI: https://doi.org/10.1007/s10450-013-9587-3