extraction of capsular polysaccharide of bacteria is one of my work and the methodology i found need a high speed of ultracentrifugation (16 hr) which is not allowed in many labs
There are many papers on the extraction and characterization of Klebsiella EPS. I'll attach a couple. You might also want to check reviews such as Bacterial Polysaccharides, by L. Kenne & B. Lindberg, Ch. 5, pp. 287-363, in The Polysaccharides, Vol. 2, G.O. Aspinall, ed. Academic Press, 1983.