Bio-jet fuel produced from non-edible oilseeds can be an alternative to fossil fuels with the benefits of increasing national energy security, reducing environmental impact, and fostering rural economic growth. Effici...Bio-jet fuel produced from non-edible oilseeds can be an alternative to fossil fuels with the benefits of increasing national energy security, reducing environmental impact, and fostering rural economic growth. Efficient oil extraction from oilseeds is critical for economic production of bio-jet fuels. Oil extractions from camelina (sativa) and canola (Brassica napus) seeds were conducted using a cold press method. The effect of the frequency controlling the screw rotation speed on the oil recovery and quality was discussed. Characterization of the produced raw vegetable oils, such as heating value, elemental content and main chemical compositions, was carried out. The results showed that the oil recovery increased when the frequency decreased. The highest oil recoveries for camelina and canola seeds were 88.2% and 84.1% respectively, both at 15 Hz. The cold press frequency and processing temperature (97.2°C - 106.0°C) had a minor influence on the qualities and recovery of both camelina and canola oils. In addition, camelina and canola oils produced at 15 Hz underwent catalytic cracking to examine potential hydrocarbon fuels production. It was observed that some of oil physicochemical properties were improved after catalytic cracking. Although more study is needed for further improvement of oil recovery and qualities, cold press could be an efficient method for oil extraction from non-edible oilseeds. Additionally, the preliminary results of upgrading the oils produced show very promising for future bio-jet fuels production.展开更多
Ten cold-pressed oil from 6 herb plant seeds(sesame, flax, safflower, pumpkin, tomato and hemp) and 4 woody plant seeds(camellia, almond, walnut and peony) were analyzed to determine bioactive compounds content, inclu...Ten cold-pressed oil from 6 herb plant seeds(sesame, flax, safflower, pumpkin, tomato and hemp) and 4 woody plant seeds(camellia, almond, walnut and peony) were analyzed to determine bioactive compounds content, including tocopherols, phytosterols and phenolics, as well as their antioxidant activities. Total tocopherols content ranged from 161.11 mg/kg in camellia seed oil to 1,072.51 mg/kg in tomato seed oil. Tomato seed oil had the highest total phytosterols(708.89 mg/100 g) and phenolics content(20.27 mg SAE/100 g),whereas, safflower seed oil has the lowest total phytosterols(173.75 mg/100 g) and walnut kernel oil contained the lowest phenolics(2.32 mg SAE/100 g), respectively. Tomato seed oil exhibited the strongest ferric-reducing antioxidant power(FARP, 311.36 μmol/100 g) and 2,2-diphenyl-1-picrylhydrazyl(DPPH) radical scavenging activity(56.40 μmol/100 g), while camellia seed oil had the lowest FRAP value(34.83 μmol/100 g) and flax seed oil had the lowest DPPH value(2.75 μmol/100 g). Correlation coefficient was determined as 0.647 and 0.863 between FRAP value and total tocopherols and phenolics, and 0.673 and 0.711 between DPPH value and total tocopherols and phenolics(p < 0.05), respectively. This result indicated the antioxidant activities(FRAP and DPPH) were highly correlated with total tocopherols and phenolics content of oil. This study will be very useful for comprehensive utilization of all 10 cold-press oils.展开更多
目的:观察精油穴位按压对慢性鼻窦炎伴鼻息肉患者鼻内窥镜术后疼痛及舒适度的影响。方法:选取120例在全麻下行鼻内窥镜手术的慢性鼻窦炎伴鼻息肉患者,按便利抽样法分为对照组及观察组各60例。对照组予常规术后护理,观察组在常规术后护...目的:观察精油穴位按压对慢性鼻窦炎伴鼻息肉患者鼻内窥镜术后疼痛及舒适度的影响。方法:选取120例在全麻下行鼻内窥镜手术的慢性鼻窦炎伴鼻息肉患者,按便利抽样法分为对照组及观察组各60例。对照组予常规术后护理,观察组在常规术后护理基础上给予精油穴位按压干预。比较2组术后各时间段视觉模拟评分法(VAS)、Kokaba舒适状况量表(GCQ)、匹兹堡睡眠质量指数评定量表(PSQI)评分的变化。结果:观察组术后6 h、术后24 h、术后48 h 3个时间段的VAS评分均低于对照组,差异均有统计学意义(P<0.05)。术后,2组GCQ评分均较术前下降,观察组GCQ评分高于对照组,差异均有统计学意义(P<0.05)。术后,2组PSQI评分均较术前增加,观察组PSQI评分低于对照组,差异均有统计学意义(P<0.05)。治疗期间,2组均未发生明显不良反应。结论:精油穴位按压能够缓解慢性鼻窦炎伴鼻息肉患者鼻内窥镜术后的疼痛程度,提高舒适度,提升睡眠质量。展开更多
文摘Bio-jet fuel produced from non-edible oilseeds can be an alternative to fossil fuels with the benefits of increasing national energy security, reducing environmental impact, and fostering rural economic growth. Efficient oil extraction from oilseeds is critical for economic production of bio-jet fuels. Oil extractions from camelina (sativa) and canola (Brassica napus) seeds were conducted using a cold press method. The effect of the frequency controlling the screw rotation speed on the oil recovery and quality was discussed. Characterization of the produced raw vegetable oils, such as heating value, elemental content and main chemical compositions, was carried out. The results showed that the oil recovery increased when the frequency decreased. The highest oil recoveries for camelina and canola seeds were 88.2% and 84.1% respectively, both at 15 Hz. The cold press frequency and processing temperature (97.2°C - 106.0°C) had a minor influence on the qualities and recovery of both camelina and canola oils. In addition, camelina and canola oils produced at 15 Hz underwent catalytic cracking to examine potential hydrocarbon fuels production. It was observed that some of oil physicochemical properties were improved after catalytic cracking. Although more study is needed for further improvement of oil recovery and qualities, cold press could be an efficient method for oil extraction from non-edible oilseeds. Additionally, the preliminary results of upgrading the oils produced show very promising for future bio-jet fuels production.
基金National Key R&D Program of China(2017YFD0400402)National Natural Science Foundation of China(31471620)National Science Foundation of China(31772010)for financial support
文摘Ten cold-pressed oil from 6 herb plant seeds(sesame, flax, safflower, pumpkin, tomato and hemp) and 4 woody plant seeds(camellia, almond, walnut and peony) were analyzed to determine bioactive compounds content, including tocopherols, phytosterols and phenolics, as well as their antioxidant activities. Total tocopherols content ranged from 161.11 mg/kg in camellia seed oil to 1,072.51 mg/kg in tomato seed oil. Tomato seed oil had the highest total phytosterols(708.89 mg/100 g) and phenolics content(20.27 mg SAE/100 g),whereas, safflower seed oil has the lowest total phytosterols(173.75 mg/100 g) and walnut kernel oil contained the lowest phenolics(2.32 mg SAE/100 g), respectively. Tomato seed oil exhibited the strongest ferric-reducing antioxidant power(FARP, 311.36 μmol/100 g) and 2,2-diphenyl-1-picrylhydrazyl(DPPH) radical scavenging activity(56.40 μmol/100 g), while camellia seed oil had the lowest FRAP value(34.83 μmol/100 g) and flax seed oil had the lowest DPPH value(2.75 μmol/100 g). Correlation coefficient was determined as 0.647 and 0.863 between FRAP value and total tocopherols and phenolics, and 0.673 and 0.711 between DPPH value and total tocopherols and phenolics(p < 0.05), respectively. This result indicated the antioxidant activities(FRAP and DPPH) were highly correlated with total tocopherols and phenolics content of oil. This study will be very useful for comprehensive utilization of all 10 cold-press oils.
文摘目的:观察精油穴位按压对慢性鼻窦炎伴鼻息肉患者鼻内窥镜术后疼痛及舒适度的影响。方法:选取120例在全麻下行鼻内窥镜手术的慢性鼻窦炎伴鼻息肉患者,按便利抽样法分为对照组及观察组各60例。对照组予常规术后护理,观察组在常规术后护理基础上给予精油穴位按压干预。比较2组术后各时间段视觉模拟评分法(VAS)、Kokaba舒适状况量表(GCQ)、匹兹堡睡眠质量指数评定量表(PSQI)评分的变化。结果:观察组术后6 h、术后24 h、术后48 h 3个时间段的VAS评分均低于对照组,差异均有统计学意义(P<0.05)。术后,2组GCQ评分均较术前下降,观察组GCQ评分高于对照组,差异均有统计学意义(P<0.05)。术后,2组PSQI评分均较术前增加,观察组PSQI评分低于对照组,差异均有统计学意义(P<0.05)。治疗期间,2组均未发生明显不良反应。结论:精油穴位按压能够缓解慢性鼻窦炎伴鼻息肉患者鼻内窥镜术后的疼痛程度,提高舒适度,提升睡眠质量。
