No abstract

This work attempted to recover high-value substances such as free fatty acids, tocopherols, sterols, and squalene by investigating a supercritical fluid CO 2 (SF CO 2 ) distillation-extraction processing of soybean oil deodorizer distillate. Experimental conditions varied between 50 and 90 °C, at 24.1 and 31.0 MPa. Reverse-phase high-performance liquid chromatography analysis was performed to analyze 14 components in the extracts after SF CO 2 treatment. Experimental results indicated that when tocopherols were extracted at 31.0 MPa, 90 (top) to 70 (bottom) °C, and 1000-L STP CO 2 usage, their recovery reached 83.6% and the average value of the concentration factor was 1.38. Furthermore, the concentration factor of tocopherols grew to 1.70 when the extracts collected in the top exceeded 400-L STP CO 2 . The concentration factors of fatty acids, squalene, and stereols were 1.37, 1.26, and 0.60, respectively. This investigation also found that the percentage of total fatty acids decreased, while polyunsaturated fatty acids increased, with an increase in the CO 2 volume given the same extraction condition.

No abstract

The changes in volatile flavor components of guava puree during processing (85-88"C, 24 set) and storage at 0°C -10°C and -20°C for up to 4 months was evaluated by Likens-Nickerson distillation and capillary GC-MS. Pasteurized guava puree showed increases in aldehydes and hydrocarbons with decrease in esters when compared with unpasteurized puree. There was only a slight decrease in alcohols and hydrocarbons of pasteurized guava puree stored at -20°C for 4 mo. Remarkable increases in ethyl alcohol, n-hexanal, decanoic acid, dodecanoic acid and ethyl acetate in pasteurized guava puree were observed when stored at 0°C and -10°C for 2 and 4 mo, respectively.

Fractional factorial design, Indicator function, Word, Non-regular design, Foldover design,