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- W1580738464 abstract "Abstract Production of lactan, a polysaccharide composed of mannose, galactose and galacturonic acid (at the ratio of 5:3:2), starting from a semi-defined medium containing lactose via fermentation with Rahnella aquatilis was described previously. In this communication, such polysaccharide was produced from five alternative fermentation media: (1) a synthetic (defined) medium, plain whey (under (2) aerobic and (3) anaerobic conditions), (4) whey permeate and (5) whey with 2% NaCl (w/v). The effect of the concentration of polysaccharide, pH and ionic strength at harvest on the rheological properties of the polysaccharide was studied using lactan-enriched fractions recovered from each medium and analysed in solution under steady shear flow. Lactan solutions showed a shear-thinning behaviour in all cases, and increases in viscosity were observed at increasing concentrations of polysaccharide, as expected. The polysaccharide fraction produced from whey with 2% (w/v) NaCl and plain whey under anaerobic conditions exhibited lower viscosity than that produced from the other media, an observation that is associated with the lower concentration of polysaccharide. Post-harvest addition of salts (KCl or CaCl 2 ) and changes in pH (3–11) affected slightly the viscosity of the polysaccharide solutions." @default.
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- W1580738464 date "1998-09-01" @default.
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- W1580738464 title "Rheological characterization under shear of a fraction of polymer produced via fermentation of whey-related media by Rahnella aquatilis1Most material reported in this paper was presented in poster form at GLUPORTwO-Second International Meeting of the Portuguese Carbohydrate Chemistry Group, and such communication received the Best Poster Award.1" @default.
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- W1580738464 doi "https://doi.org/10.1016/s0144-8617(98)00032-0" @default.
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