Glycoglycerolipids were isolated from seaweed-associated marine actinomycete strain PK206-15, which was identified as
Streptomyces coelescens based on 16S rDNA sequence analysis. The compounds were isolated by silica gel chromatography and high performance liquid chromatography. The structures were analyzed by nuclear magnetic resonance, high resolution-electrospray ionization-mass spectrometry, and methanolysis. The compounds were identified as 2
R-1,2-di-12-methylhexadecanoic acid-3-
O-[β-
D-galactopyranosyl-(1''-6')-
O-β-
D-galactopyranosyl]-glycerol, 2
R-1-12-methylhexadeca noic acid-2-hydroxyl-3-
O-[β-
D-galactopyranosyl-(1''-6')-
O-β-
D-galactopyranosyl]-gly cerol, 2
R-1,2-di-12-methylhexadecanoic acid-3-
O-β-
D-galactopyranosyl-glycerol, and 2
R-1,2-di-14-methylhexadecanoic acid-3-
O-β-
D-galactopyranosyl-glycerol. These were active against the following fouling organisms: zoospores of
Ulva pertusa, the diatom
Navicula annexa, the mussel
Mytilus edulis, and fouling bacteria with an EC
50 range of 0.005–0.2 µg/mL.
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