title: High-performance liquid chromatographic determination of the rhamnolipids produced by Pseudomonas aeruginosa.
abstract: The bacterial biosurfactants 3-[3'-(L-rhamnopyranosyloxy)decanoyloxy]decanoic acid (RL-1) and 3-[3'-(2"-O-alpha-L-rhamnopyranosyl-alpha-L-rhamnopyranosyloxy) decanoyloxy]decanoic acid (RL-2) were isolated from Pseudomonas aeruginosa DSM 2659 cultures. An HPLC method was developed for the p-bromophenacyl esters of the rhamnolipids. Separation was obtained within 25 min on a RP C18 column using a linear gradient of water-acetonitrile (30:70 to 0:100) and UV detection (265 and 320 nm). Linearity of response existed for 1.2-25 microg of the RL-1 and 1.8-25 microg of the RL-2-p-bromophenacyl ester (0.9-19.2 microg RL-1 and 1.3-18.0 microg RL-2). The reproducibility of the entire analytical method (extraction, derivatisation) was tested.
authors.affiliation: Rheinisch-Westfälische Technische Hochschule Aachen, Institut für Biologie V, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Schenk
authors.forename: I
authors.initials: I
authors.lastname: Schuphan
authors.forename: B
authors.initials: B
authors.lastname: Schmidt
mesh_terms: D002240:Carbohydrate Sequence; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003470:Culture Media; D006017:Glycolipids / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D011550:Pseudomonas aeruginosa / Q000737:chemistry*; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D003470:Culture Media; D006017:Glycolipids