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The use of modified divinylbenzene-polystyrene resins in the separation of fermentation products. A case study utilizing amino acids and a dipeptide.

Authors
  • Casillas, J L
  • Addo-Yobo, F
  • Kenney, C N
  • Aracil, J
  • Martínez, M
Type
Published Article
Journal
Journal of Chemical Technology & Biotechnology
Publisher
Wiley
Publication Date
Jan 01, 1992
Volume
55
Issue
2
Pages
163–169
Identifiers
PMID: 1368901
Source
Medline
License
Unknown

Abstract

The adsorption of phenylalanine, aspartic acid, asparagine and aspartame from phosphate-buffered aqueous solutions with modified divinyl-benzene-polystyrene resins has been investigated using high pressure liquid chromatography (HPLC). The pH studied was 2.8, the temperature range was 293-313 K and the ionic strength was maintained at 1.0 mol dm-3. Over the range of variables investigated, the adsorption isotherms are linear and may be characterized by temperature and pH-dependent apparent adsorption equilibrium constants, characteristic of the resin-adsorbate system. By studying the dependence on temperature of this adsorption constant, heats of adsorption and entropy of adsorption have been estimated. In terms of the heat liberated on adsorption, the amino acids and a dipeptide can be ranked thus: aspartame > phenylalanine > aspartic acid > asparagine.

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