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• W1720048053 abstract "Abstract Corynomycolic acids have two hydrophilic heads (OH and COOH) and two hydrophobic tails on adjacent carbon atoms. In this work, hybrid type corynomycolic acids ( syn - and anti -isomers) were synthesized via the following three steps: 1) crossed Claisen condensation of t -butyl tridecanoate with ethyl per fluorooctanoate, 2) reduction of C = O to OH, and 3) conversion of COO- t -Bu to COOH using CF 3 COOH. Both hydrophilic groups (OH and COOH) of hybrid corynomycolic acid would dissociate to –O – and –COO – at alkaline condition ( p H = 12) while they remain unchanged at acidic condition ( p H < 3). The effect of hybrid structure on the surfactant properties was investigated by the surface tension and surface pressure-area (π- A ) measurements. Hybrid type corynomycolic acid gave smaller cmc and γ cmc than dialkyl type one due to fluoroalkyl chain. With respect to the stereochemistry, the anti -isomer attained a smaller γ cmc value than the syn -isomer. In π- A measurements, the monolayer of the syn -isomer showed a lower collapsing pressure (∼15 mN m – 1 ) than that of the anti -isomer." @default.
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• W1720048053 date "2015-05-13" @default.
• W1720048053 modified "2023-10-17" @default.
• W1720048053 title "Hybrid Biosurfactant: Syntheses of Hybrid Corynomycolic Acid and its Monolayer Formation" @default.
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• W1720048053 doi "https://doi.org/10.3139/113.110369" @default.
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