In this study,ascorbyl palmitate(AP)incorporated in nanostructured lipid carriers(NLCs-AP)was fabricated using the hot-homogenization method.The amounts of AP,Tween 80,glyceryl stearate,and oleic acid were optimized b...In this study,ascorbyl palmitate(AP)incorporated in nanostructured lipid carriers(NLCs-AP)was fabricated using the hot-homogenization method.The amounts of AP,Tween 80,glyceryl stearate,and oleic acid were optimized by Box-Behnken Design(BBD)to obtain a high percentage of encapsulation efficiency and loading efficiency.Then,the optimum NLCs-AP,free-AP with rosemary essential oil(REO),NLCs-AP with REO,and tert-Butylhydroquinone(TBHQ)at a concentration of 75 ppm were added to camelina oil.Then peroxide value(PV),anisidine value(AV),TOTOX value(TV),oxidative stability using Rancimat,total phenol content(TPC),and antioxidant activity in camelina oil samples were evaluated during 90 days of storage at the ambient temper-ature.The optimum NLCs-AP had a particle size of 133.4 nm and a PDI of 0.29.The transmission electron microscopy(TEM)showed a spherical and smooth surface of the optimum NLCs-AP.The results of differential scanning calorimetry(DSC)and Fourier transfer spectroscopy infrared(FTIR)analyses implied that there was no interaction between AP and NLCs.The Korsmeyer-Peppas model was the best model for the evaluation of the release kinetics.The amounts of PV,AV,and TV of camelina oil containing the optimum NLCs-AP were slightly higher than the oil containing TBHQ.The highest oxidative protection,TPC,and antioxidant activity percentage were achieved in camelina oil containing NLCs-AP with REO.Conclusively,the optimum NLCs-AP had excellent potential for encapsulation of AP,and the mixture of REO and NLCs-AP could be applied for giving suitable oxidative stability in camelina oil.展开更多
本文通过中层大气高空冰探测器(Aeronomy of Ice in the Mesosphere,AIM)卫星的仪器载荷——用于云成像和粒子实验的探测器(Cloud Imaging and Particle Size,CIPS)和用于冰晶实验的太阳掩星探测器(Solar Occultation for Ice Experimen...本文通过中层大气高空冰探测器(Aeronomy of Ice in the Mesosphere,AIM)卫星的仪器载荷——用于云成像和粒子实验的探测器(Cloud Imaging and Particle Size,CIPS)和用于冰晶实验的太阳掩星探测器(Solar Occultation for Ice Experiment,SOFIE)在2007—2014年间南、北半球的观测数据,分析了2007—2014年间夜光云的反照率、冰水含量(ice water content,IWC)、每日发生率及中层顶温度在南、北半球的变化趋势,讨论了夜光云发生位置和年变化,并且对夜光云反照率、中层顶温度和IWC的相关性进行了分析。结果表明:南、北半球夜光云主要发生在80°~85°纬度范围内,与南半球相比,北半球夜光云反照率持续时间更长、年波动更小、IWC更高且每日发生率更高,而南半球90°W~150°W位置的反照率总是较低;南、北半球夜光云反照率和IWC均与中层顶温度之间存在负相关关系,但反照率和冰水含量相关性表现不明显。本文的研究结果为夜光云作为中间层大气变化的敏感指标提供了量化依据;同时,南、北半球夜光云的差异特性有助于改进气候模型,对理解长期气候变化中的半球不对称响应具有参考意义。展开更多
文摘In this study,ascorbyl palmitate(AP)incorporated in nanostructured lipid carriers(NLCs-AP)was fabricated using the hot-homogenization method.The amounts of AP,Tween 80,glyceryl stearate,and oleic acid were optimized by Box-Behnken Design(BBD)to obtain a high percentage of encapsulation efficiency and loading efficiency.Then,the optimum NLCs-AP,free-AP with rosemary essential oil(REO),NLCs-AP with REO,and tert-Butylhydroquinone(TBHQ)at a concentration of 75 ppm were added to camelina oil.Then peroxide value(PV),anisidine value(AV),TOTOX value(TV),oxidative stability using Rancimat,total phenol content(TPC),and antioxidant activity in camelina oil samples were evaluated during 90 days of storage at the ambient temper-ature.The optimum NLCs-AP had a particle size of 133.4 nm and a PDI of 0.29.The transmission electron microscopy(TEM)showed a spherical and smooth surface of the optimum NLCs-AP.The results of differential scanning calorimetry(DSC)and Fourier transfer spectroscopy infrared(FTIR)analyses implied that there was no interaction between AP and NLCs.The Korsmeyer-Peppas model was the best model for the evaluation of the release kinetics.The amounts of PV,AV,and TV of camelina oil containing the optimum NLCs-AP were slightly higher than the oil containing TBHQ.The highest oxidative protection,TPC,and antioxidant activity percentage were achieved in camelina oil containing NLCs-AP with REO.Conclusively,the optimum NLCs-AP had excellent potential for encapsulation of AP,and the mixture of REO and NLCs-AP could be applied for giving suitable oxidative stability in camelina oil.
文摘本文通过中层大气高空冰探测器(Aeronomy of Ice in the Mesosphere,AIM)卫星的仪器载荷——用于云成像和粒子实验的探测器(Cloud Imaging and Particle Size,CIPS)和用于冰晶实验的太阳掩星探测器(Solar Occultation for Ice Experiment,SOFIE)在2007—2014年间南、北半球的观测数据,分析了2007—2014年间夜光云的反照率、冰水含量(ice water content,IWC)、每日发生率及中层顶温度在南、北半球的变化趋势,讨论了夜光云发生位置和年变化,并且对夜光云反照率、中层顶温度和IWC的相关性进行了分析。结果表明:南、北半球夜光云主要发生在80°~85°纬度范围内,与南半球相比,北半球夜光云反照率持续时间更长、年波动更小、IWC更高且每日发生率更高,而南半球90°W~150°W位置的反照率总是较低;南、北半球夜光云反照率和IWC均与中层顶温度之间存在负相关关系,但反照率和冰水含量相关性表现不明显。本文的研究结果为夜光云作为中间层大气变化的敏感指标提供了量化依据;同时,南、北半球夜光云的差异特性有助于改进气候模型,对理解长期气候变化中的半球不对称响应具有参考意义。
