Supercritical carbon dioxide （SC-CO2） extraction was employed to extract oil from Nigella glandulifera Freyn seed in this study. Response surface methodology （RSM） was applied to evaluate the effects of the proces...Supercritical carbon dioxide （SC-CO2） extraction was employed to extract oil from Nigella glandulifera Freyn seed in this study. Response surface methodology （RSM） was applied to evaluate the effects of the process parameters （pressure, temperature, and CO2 flow rate） on oil yield of N. glandulifera seed. A Box-Behnken design was used to optimize the extraction parameters. The analysis of variance indicated that the linear coefficients of pressure and CO2 flow rate, the quadratic term coefficients of pressure and temperature and the interactions between pressure and temperature, as well as temperature and CO2 flow rate, had significant effects on the oil yield （P〈0.05）. The optimal conditions to obtain the maximum oil yield from N. glandulifera seed were pressure 30.84 MPa, temperature 40.57°C, and CO2 flow rate 22.00 L h-1. Under these optimal conditions, the yield of oil was predicted to be 38.19%. The validation experiment results agreed with the predicted values. The fatty acid composition of N. glandulifera seed oil extracted using SC-CO2 was compared with that of oil obtained by Soxhlet method. The results showed that the fatty acid compositions of oil extracted by the two methods were similar. Identification of oil compounds with gas chromatography-mass spectrometry （GC-MS） showed that the contents of unsaturated fatty acids linoleic acid （48.30%）, oleic acid （22.28%） and saturated fatty acids palmitic acid （16.65%）, stearic acid （4.17%） were the most abundant fatty acids in seed oil from N. glandulifera.展开更多
基金supported by the Public Welfare Industry (Agriculture) Research Program,China (200903018)
文摘Supercritical carbon dioxide （SC-CO2） extraction was employed to extract oil from Nigella glandulifera Freyn seed in this study. Response surface methodology （RSM） was applied to evaluate the effects of the process parameters （pressure, temperature, and CO2 flow rate） on oil yield of N. glandulifera seed. A Box-Behnken design was used to optimize the extraction parameters. The analysis of variance indicated that the linear coefficients of pressure and CO2 flow rate, the quadratic term coefficients of pressure and temperature and the interactions between pressure and temperature, as well as temperature and CO2 flow rate, had significant effects on the oil yield （P〈0.05）. The optimal conditions to obtain the maximum oil yield from N. glandulifera seed were pressure 30.84 MPa, temperature 40.57°C, and CO2 flow rate 22.00 L h-1. Under these optimal conditions, the yield of oil was predicted to be 38.19%. The validation experiment results agreed with the predicted values. The fatty acid composition of N. glandulifera seed oil extracted using SC-CO2 was compared with that of oil obtained by Soxhlet method. The results showed that the fatty acid compositions of oil extracted by the two methods were similar. Identification of oil compounds with gas chromatography-mass spectrometry （GC-MS） showed that the contents of unsaturated fatty acids linoleic acid （48.30%）, oleic acid （22.28%） and saturated fatty acids palmitic acid （16.65%）, stearic acid （4.17%） were the most abundant fatty acids in seed oil from N. glandulifera.
文摘目的建立透骨草药材来源中狭山野豌豆Vicia amoena超高效液相色谱(UPLC)指纹图谱,并与其余5种来源品种进行比较,为透骨草药材质量控制提供参考依据。方法用Eclipse Plus C_(18) RRHD(50 mm×2.1 mm,1.8μm)色谱柱,以乙腈-0.1%甲酸溶液为流动相梯度洗脱,体积流量0.2 m L/min;柱温30℃;检测波长340 nm。测定10个不同产地狭山野豌豆指纹图谱,采用中药色谱指纹图谱相似度评价系统(2004A版)计算相似度,并用对照品和液质联用技术指认色谱峰;同条件下比较鉴别透骨草药材其他5种来源品种。结果建立了狭山野豌豆指纹图谱,采用超高效液相色谱-电喷雾-四级杆-飞行时间串联质谱仪(UPLC-ESI-Q-TOF-MS)对14个共有峰中的6个峰进行初步归属,确定为绿原酸、杨梅苷、金丝桃苷、异槲皮苷、山柰苷、槲皮苷;透骨草药材其他5种来源品种与狭山野豌豆指纹图谱的共有模式明显不同。结论该方法重现性好、特征性强,可用于透骨草药材全面质量评价。
