Table 1. Rhamnolipid production of different motile P. aeruginosa strains and clinical isolates.

P. aeruginosa isolate (source)	Rhamnolipid concentration (µg/ml)
PAO1	336±78
PAK	38±6
PAKΔfliC	20±1
PA-O (skin)	56±17
PA227 (blood)	63±10
PA264 (skin)	538±76
PA391 (CF-lung)	795±1
PA1450 (skin)	702±25

Rhamnolipids were isolated from 24 h cultures of different P.aeruginosa isolates by chloroform extraction and quantified by the Methylene-blue method. The rhamnolipid concentration is given as the mean ± SD of three independent experiments.