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David Nkurunziza,Phillip Pendleton,Saravana Periaswamy Sivagnanam,박진석,전병수 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
This study aimed to enhance the hydrolytic conversions of conjugated isoflavones to non-conjugatedaglycones from soybean byproducts (okara) using subcritical water hydrolysis. Processing parameters fortemperature, pressure and solid liquid mixing ratio were set as constant variables following theexperimental design performed in our previous study for the optimization of isoflavones extraction andkinetics modeling using subcritical water and response surface methododology. Fixed operatingconditions were temperature (T: 150 C), pressure (P: 4 MPa) and solid liquid ratio (s/l: 20 mg/mL), andthe reaction time was the sole control variable. The results revealed that prolonging the reaction timeincreased the concentrations of genistein and daidzein by 6.5 and 9 fold, respectively. Total phenoliccontents increased up to 55%, and the antioxidant activities exhibited a strong correlation with isoflavoneaglycones and phenolic contents.
J.N. Moon,Adane Tilahun Getachew,A.S.M. Tanbirul Haque,Periaswamy Sivagnanam Saravana,Y.J. Cho,David Nkurunziza,B.S. Chun 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
This study was aimed to extract oil from Asiasarum heterotropoides using supercritical carbon dioxide (Sc-CO2) with and without ethanol as co-solvent and to compare the results with conventional extraction solvents. A total of 27 major volatile organic compounds (VOCs) were identified among them eucarvone, 3-carene, safrole, methyleugenol, and camphene were found to be the highest. The solvent Sc-CO2 + ethanol at 250 bar and 50 °C was found to be the best condition to get high yield of oil with 3.54 ± 0.21%. The extracted oil showed 100% of deodorant efficiency within 30 min of reaction with an artificially manufactured odorant.