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Modeling of batchwise xanthan production
Author(s) -
Peters H.U.,
Suh I.S.,
Schumpe A.,
Deckwer W.D.
Publication year - 1992
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450700418
Subject(s) - xanthomonas campestris , xanthan gum , molar mass , chemistry , mass transfer , polysaccharide , oxygen , citric acid , food science , limiting , chromatography , materials science , biochemistry , organic chemistry , rheology , polymer , composite material , gene , mechanical engineering , engineering
An empirical model for the production of xanthan polysaccharide by batchwise cultivation of Xanthomonas campestris was developed. The effects of oxygen depletion in the liquid and bacterial growth rate on the xanthan production rate and the time‐course of the xanthan molar mass were taken into account. When the oxygen transfer was rate limiting in the non‐growth phase, the molar mass of the final xanthan product was lower than that observed in the absence of oxygen limitation. A constant feed of medium, containing citric acid, increased the xanthan productivity and allowed a polysaccharide concentration of 50 kg/m 3 to be reached within 57 h. Low productivity observed in a 3 m 3 reactor with small‐diameter Rushton turbines was attributed to stagnant zones in the wall region.