Production of Glycolipid Biosurfactants, Mannosylerythritol Lipids, by Pseudozyma siamensis CBS 9960 and Their Interfacial Properties(MICROBIAL PHYSIOLOGY AND BIOTECHNOLOGY)
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概要
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The search for a novel producer of glycolipid biosurfactants, mannosylerythritol lipids(MELs), was undertaken on the basis of the analysis of ribosomal DNA sequences of yeast strains of the genus Pseudozyma. In the course of the investigation, Pseudozyma siamemis CBS 9960, which is closely related to Pseudozyma shanxiensis, a known MEL-C producer but with a different morphology, was found to accumulate a large amount of glycolipids. On thin layer chromatography, the extracellular glycolipids showed nearly the same spots as those of the MELs produced by P. shanxiensis. However, the result of high-performance liquid chromatography analysis revealed that the present strain has a much higher glycolipid production yield than P. shanxiensis. From the structural characterization by ^1H and ^<13>C NMR, the major glycolipid(more than 84% of the total) was identified as a mixture of 4-O-[(2',4'-di-O-acetyl-3'-O-alka(e)noyl)-β-D-mannopyranosyl]-D-erythritol and 4-O-[(4'-O-acetyl-3'-O-alka(e)noyl-2'-O-butanoyl)-β-D-mannopyranosyl]-D-erythritol, both of which are types of MEL-C. The present MEL-C possessed a short-chain acid(C_2 or C_4) at the C-2' position and a long-chain acid(C_<16>) at the C-3' position of the mannose moiety, and thus, the hydrophobic part was considerably different from that of conventional MELs, which mainly possess two medium-chain acids(C_<10>) at the C-2' and C-3' positions. Under optimal growth conditions with safflower oil in a shake culture, the total amount of MELs reached approximately 19 g/l after 9 d at 25℃. We further investigated the interfacial properties of the present MEL-C, considering its unique hydrophobic structure. The observed critical micelle concentration(CMC) and the surface tension at the CMC of the MEL were 4.5×10^<-6> M and 30.7 mN/m, respectively. In addition, on a water penetration scan, the MEL efficiently formed the liquid crystal phases such as hexagonal(H) and lamella(L_α) at a wide range of concentrations. These results demonstrated that the newly identified MEL-C produced by P. siamensis exhibits not only high surface activity but also excellent self-assembling properties, and should facilitate the development of promising yeast biosurfactants.
- 社団法人日本生物工学会の論文
- 2008-05-25
著者
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KITAMOTO Dai
Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industria
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Imura Tomohiro
Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industria
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Fukuoka Tokuma
Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industria
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Konishi Masaaki
Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industria
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Morita Tomotake
Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industria
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Konishi Masaaki
Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
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Konishi Masaaki
Res. Inst. For Innovation In Sustainable Chemistry National Inst. Of Advanced Industrial Sci. And Te
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Kitamoto Dai
Research Institute For Innovation In Sustainable Chemistry National Institute Of Advanced Science An
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Fukuoka Tokuma
Research Institute For Innovation In Sustainable Chemistry National Institute Of Advanced Science An
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Imura Tomohiro
Research Institute For Innovation In Sustainable Chemistry National Institute Of Advanced Science An
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Imura T
National Institute Of Advanced Industrial Science And Technology (aist)
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Imura Tomohiro
National Institute Of Advanced Industrial Science And Technology (aist)
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Kitamoto Dai
Research Institute For Innovation In Sustainable Chemistry National Institute Of Advanced Industrial
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Imura Tomohiro
National Institute Of Advanced Industrial Science And Technology
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Morita Tomotake
Research Institute For Innovation In Sustainable Chemistry National Institute Of Advanced Science An
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Takashima Masako
Japan Collection Of Microorganisms Riken Bioresource Center
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