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- W2004132376 abstract "Chitosans with different chemical compositions and molecular weights have been evaluated as flocculants of Escherichia coli suspensions. The flocculation performance of chitosans at different conditions (pH, ionic strength) was followed by residual turbidity measurements. For precise comparison, the chitosan concentrations corresponding to 75% flocculated bacteria (x75) were calculated from a mathematical function fitted to the measured data. At all conditions, an increase in the fraction of acetylated units (FA) resulted in lower x75 and thereby better flocculation efficiency. Especially the most acetylated chitosans (FA 0.49 and FA 0.62) were excellent flocculants. An increase in FA from 0.002 to 0.6 caused a 10-fold reduction in necessary concentrations, at both pH 5 and 6.8. pH was a rather insignificant factor in the range 4−7.4, further pH increase led to either increase of necessary doses at low FA or sudden ceasing of flocculation at high FA. The chitosans flocculated in a broad range of molecular weights, although an increase in molecular weight was a favorable factor. Increase in ionic strength caused a severalfold reduction in x75 for all chitosans and considerable broadening of flocculation intervals." @default.
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- W2004132376 date "2000-11-29" @default.
- W2004132376 modified "2023-09-25" @default.
- W2004132376 title "Screening of Chitosans and Conditions for Bacterial Flocculation" @default.
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- W2004132376 doi "https://doi.org/10.1021/bm005601x" @default.
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