Development of Nanobiore actor for Remediation of Foods and Environments

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A thin nanoporous silica membrane was prepared by the two-step sol-gel method for the purpose that the generation of an aggregate having the higher fractal dimension was suppressed in the intermediate process. It succeeded in the preparation of the thin silica film with nanospace of about 3.3nm. The model reaction in which sea sand was made to adsorb the alkylphenol was carried out, and it was found that adsorbing nonylphenol and octylphenol and bisphenol A are quickly decomposed by laccase. The decomposition of an artificial estrogen also confirmed being possible. Log P, which was an useful parameter when we evaluate the solvent property of supercritical carbon dioxide, was estimated. As the pressure of carbon dioxide was increase on the pressure of 3.0 11.8 MPa, log P tended to increase from 0.9 to 2.0. It was shown that the polarity had appeared in carbon dioxide under the supercritical state by the pressure, and that the polarity became small with the increase in the pressure. On the esterification reaction between stearic acid and ethanol using lipase, the reaction rate rose with the increase in the pressure, and it agreed with the increase tendency of log P approximately. It was shown from these results that the solvent property as a bulk had to be considered in addition to the interaction between solute and carbon dioxide, enzyme surface, wall surface, respectively, when it examined the enzyme reaction in nanospace by using supercritical carbon dioxide as a solvent.