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- W4211060686 abstract "The term dextran will be used to describe preparations of D-glucans that contain substantial numbers of (1→6)-linked α-D-glucopyranosyl residues. This chapter discusses the biosynthesis and structure of Dextrans. Large numbers of bacteria synthesize dextrans exocellularly when grown on sucrose-containing media. Dextrans and levans synthesized concomitantly by Leuconostoc micro-organisms have been separated by fractionally precipitating the polysaccharides from aqueous ethanol. The discussion of the structural studies in this chapter is divided into two parts: the first deals with the chemical elucidation of dextran structures, and the second, with the application of physicochemical measurements to the examination of network structures formed by association of dextran molecules. To facilitate the examination of the network structures that are formed by dextrans, the salient features of polysaccharide networks is summarized. Particular difficulties exist in purifying dextrans synthesized by many streptococci, because the bacteria simultaneously elaborate exocellular fructans. Under the conditions required for dextran synthesis, many streptococci synthesize large amounts of endocellular, glycogen-like polysaccharide that may become significant contaminants of dextrans from whole-cultures of the bacterias if sufficient bacterial cells lyse." @default.
- W4211060686 created "2022-02-13" @default.
- W4211060686 creator A5006384817 @default.
- W4211060686 date "1974-01-01" @default.
- W4211060686 modified "2023-10-14" @default.
- W4211060686 title "Dextrans" @default.
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