Structural Characterization and Surface-Active Properties of a Succinoyl Trehalose Lipid Produced by Rhodococcus sp. SD-74
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概要
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Succinoyl trehalose lipids (STLs) are promising glycolipid biosurfactants produced from n-alkanes by Rhodococcus sp. These compounds show not only unique interfacial properties but also versatile biochemical actions. In this study, we determined for the first time the complete structure of the main component, namely STL-1, based on NMR, MALDI-TOF/MS and GC-MS analyses. The present STL-1 produced from n-hexadecane was identified as 3,4-di-O-alkanoyl-2-O-succinoyl-α-D-glucopyranosyl-2′-O-succinoyl-α-D-glucopyranoside. The major fatty acid of STL-1 was C16, indicating that n-hexadecane as the carbon source is directly incorporated into the carbohydrate moiety via terminal oxidation. We also investigated its surface active properties using a Whilhelmy method at 25°C. The estimated CMC and γCMC values for STL-1 were 5.6×10-6 M and 19.0 mN/m, and those for sodium salt (NaSTL-1) were 7.7×10-6 M and 23.7 mN/m, respectively. The high activity of STL-1 was probably due to the unique molecular structure resulting from its multiple functional groups including succinic acids and two long fatty acids. Accordingly, STL-1 and its sodium salt were demonstrated to exhibit an excellent surface-activity at remarkably low concentrations, and should have great potential for environmentally friendly surfactants.
著者
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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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Uchiyama Hiroo
Graduate School Of Life And Environmental Sciences Univ. Of Tsukuba
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Nomura Nobuhiko
Graduate School Of Life And Environmental Science University Of Tsukuba
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Kitamoto Dai
Research Institute For Innovation In Sustainable Chemistry National Institute Of Advanced Industrial
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Morita Tomotake
Research Institute For Innovation In Sustainable Chemistry National Institute Of Advanced Science An
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Tokumoto Yuta
Graduate School of Life and Environmental Sciences, University of Tsukuba
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KITAMOTO Dai
Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
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