Papers by Author: Hui Zhao

Abstract: We developed a new procession of extraction efficiency of ginger oleoresin by comparing the CO2 flux in liquid state with that in supercritical state under variant pressure conditions. In our this report, we found that the optimal parameters of this procession: 9～10MPa in extraction pressure, 10～20°C in extraction temperature, 8～10MPa in isolation pressure, and 35～45°C in isolation temperature. This procession is steady and ensures both the extraction yield of ginger oleoresin and the low cost of operation.

Abstract: We developed a supercritical CO₂ extraction procession and determinated ginger essential oil contents from the ginger oleoresin to explore the effects of temperatures or pressures on the supercritical CO₂ extraction. Our research indicated that pressures had little effect on the liquid CO₂ extraction capacity. However, supercritical CO₂ extraction capacity was affected dramatically by the variant pressures. Additionally, changing pressures or temperature pushed the CO₂ into transcritical isolation state. Under this circumstance, we not only ensured the yield of ginger oleoresin, but also did we obtain the ginger essential oil and gingerol simultaneously.

Abstract: Supercritical carbon dioxide extraction had been used in the extraction conditions for carotenoids from the marigold flower (Tagetes erecta L.). Five significant factors (particle size, temperature, pressure, time and co-solvent addition) on total carotenoid yield were obtained using one-at-a-time design (p≤0.05). The optimal extraction conditions were 55 oC, 50 MPa and 180 min. Under these conditions, the yield of carotenoids was 6.872mg/g.