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1985 (1)
1Author    Christoph Syldatk, Siegmund Lang, FritzW. Agner, Victor Wray, Ludger WitteRequires cookie*
 Title    Chemical and Physical Characterization of Four Interfacial-Active Rhamnolipids from Pseudomonas spec. DSM 2874 Grown on /i-Alkanes  
 Abstract    Four extracellular glycolip id s p rod u ced under g r o w th -lim itin g c o n d itio n s w ere iso la ted from the culture broth o f Pseudomonas spec. D SM 2874. A fter p u r ific a tio n by c o lu m n and th ick -la y er chrom atography they were id en tified as a n io n ic rh a m n o lip id s. 'H and '3C -N M R stu d ie s sh o w e d that two o f these, /? (/? (2 -0 -a -L -rh a m n o p y ra n o sy lo x y)d eca n o y l)d eca n o ic a cid and /?(/?(2-0-a-L -rh a m n o p y ran osyl-x-L -rh am n op yran osyloxy)d ecan oyloxy)d ecan oic acid , w ere id en tica l w ith c o m ­ pounds described previously, w h ile the other m ore h y d r o p h ilic c o m p o u n d s, /? (2 -0 -a -L -r h a m n o -p yranosyloxy)decanoic acid and /? (2 -0 -a -L -r h a m n o p y ra n o sy l-ix -L -rh a m n o p y ra n o sy lo x y)d e ca n o ic acid, were new com pounds. Surface and interfacial activity o f the organic crude extract and o f the purified com ponents were determined in different aqueous solutions. The pH -dependence o f surface and interfacial properties o f the two previously described rham nolipids (4, 20. 23) were exam ined in Teorell-Stenhagen-buffer (supplemented with 10% N aC l) at pH 3.0 and pH 9.0. All rham nolipids reduced the surface-tension from 72 to about 30 m N / m and the interfacial-tension from 42 to about 1 m N /m . The critical m icelle concentrations were o f the order o f 5 to 200 mg/1 depending on the structure o f the molecule. 
  Reference    Z. Naturforsch. 40c, 51—60 (1985); received August 20 1984 
  Published    1985 
  Keywords    Pseudomonas, Interfacial-Active, Rham nolipids, «-Alkanes, Structure-Eludication 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0051.pdf 
 Identifier    ZNC-1985-40c-0051 
 Volume    40