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Effect of the Nitrogen Source on Pyruvate Content and Rheological Properties of Xanthan
Author(s) -
Candia J.L. Flores,
Deckwer W.D.
Publication year - 1999
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1021/bp990028i
Subject(s) - rheology , xanthomonas campestris , chemistry , viscosity , food science , yield (engineering) , chemical engineering , biochemistry , materials science , composite material , engineering , gene
Batch and fed batch cultivations of Xanthomonas campestris with varying amounts of the N source (NH 4 Cl) yield xanthan polymers which differ in pyruvate content. Analyzing the rheological properties of the xanthans produced exhibits that it is not only the molecular mass but also the pyruvate content that affects the viscosity of xanthan solutions. However, there is obviously no simple functional dependency but rather a step increase in viscosity when going from below 2 to above 3 wt % of pyruvate.