Subcritical water enhances hydrolytic conversions of isoflavones and recovery of phenolic antioxidants from soybean byproducts (okara)

다국어 초록 (Multilingual Abstract)

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.

참고문헌 (Reference)

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