Abstract
Sugar surfactants are a relatively new class of surfactants with carbohydrate as their hydrophilic part. So far, the studies about their physical chemical properties have been unsystematic. This paper reported the aggregation of surfactant N-dodecylglucosylamine and its binding with DNA in the presence of different carboxylic acids. We found that among propionic acid, butyric acid, and hexanoic acid, hexanoic acid made the surfactant exhibit the highest capability and efficiency for decreasing the surface tension of water and aggregate into micelles most efficiently. Once propionic acid (or butyric acid) was replaced with propanedioic acid (or succinic acid), the critical micelle concentration (cmc) for N-dodecylglucosylamine was decreased, while when hexanoic acid was replaced with adipic acid, cmc was increased. In the presence of DNA, the surfactant could aggregate at a concentration much lower than that without DNA. Moreover, DNA conformation was changed in N-dodecylglucosylamine/carboxylic acid systems and the change was observed more obviously in the presence of propionic acid and propanedioic acid.
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