本研究以热变性乳清分离蛋白(heat-denatured whey protein isolate,hWPI)、乳清分离蛋白(whey protein isolate,WPI)和麦芽糊精(maltodextrin,MD)为壁材,制备鱼油-姜黄素微胶囊粉末,并对其理化特性等进行分析。结果表明,5%hWPI、5%WPI...本研究以热变性乳清分离蛋白(heat-denatured whey protein isolate,hWPI)、乳清分离蛋白(whey protein isolate,WPI)和麦芽糊精(maltodextrin,MD)为壁材,制备鱼油-姜黄素微胶囊粉末,并对其理化特性等进行分析。结果表明,5%hWPI、5%WPI和5%MD制备的鱼油纳米乳状液粒径呈单峰分布,微胶囊表面几乎无缝隙和裂痕,包埋率可达96.5%。姜黄素的添加对乳状液的粒径、ζ-电位以及微胶囊的包埋率没有显著影响,但是能显著提高微胶囊的复溶性(由74.65%提升至82.01%),并略提高其热稳定性,原因可能在于姜黄素和蛋白质之间存在疏水相互作用和氢键,两者形成可溶性复合物。随着姜黄素添加量的提高,更多的姜黄素吸附在油-水界面上,延缓了多不饱和脂肪酸的降解,提高了微胶囊粉末的氧化稳定性。0.2%姜黄素微胶囊在45℃贮藏35 d后,姜黄素、二十碳五烯酸、二十二碳六烯酸的保留率分别为81%、39%和39%。本研究可为功能性油脂及多酚类相关工业化微胶囊产品开发提供参考。展开更多
Copper oxide cluster ions CunOm n=1-22, m=1-12 are generated by 523 nm laser ablation of CuCO3 solid sample with Time of Flight Mass Spectrometer detection.By changing precursor, we get sbolar TOF MS from Cu(NO3)2 sam...Copper oxide cluster ions CunOm n=1-22, m=1-12 are generated by 523 nm laser ablation of CuCO3 solid sample with Time of Flight Mass Spectrometer detection.By changing precursor, we get sbolar TOF MS from Cu(NO3)2 sample, but narrower mass distribution from CuO sample. We suggest that this is caused by collisionally stabilization. Small gas molecules CO2 and NO2, generated by laser ablation of CuCO3 and Cu(NO3)2, act as bther gas in supersonic molecular bearns, and they are helpful for the production of high mass clusters.展开更多
Two calculation modes for the effect of external load on slope stability, i.e., mode I in which the external load is thought to act on slope surface, and mode II in which the external load is thought to act on slip su...Two calculation modes for the effect of external load on slope stability, i.e., mode I in which the external load is thought to act on slope surface, and mode II in which the external load is thought to act on slip surface along the force action line, were considered. Meanwhile, four basic distribution patterns of external load were used, of which complex external loads could be composed. In analysis process, several limit equilibrium methods, such as Swedish method, simplified Bishop method, simplified Janbu method, Spencer method, Morgenstern-Price(M-P) method, Sarma method, and unbalanced thrust method, were also adopted to contrast their differences in slope stability under the external load. According to parametric analysis, some conclusions can be obtained as follows:(1) The external load, with the large magnitude, small inclination angle, and acting position close to the slope toe,has more positive effect on slope stability;(2) The results calculated using modes I and II of external load are similar, indicating that the calculation mode of external load has little influence on slope stability;(3) If different patterns of external loads are equivalent to each other, their slope stability under these external loads are the same, and if not, the external load leads to the better slope stability,as action position of the resultant force for external load is closer to the lower sliding point of slip surface.展开更多
文摘本研究以热变性乳清分离蛋白(heat-denatured whey protein isolate,hWPI)、乳清分离蛋白(whey protein isolate,WPI)和麦芽糊精(maltodextrin,MD)为壁材,制备鱼油-姜黄素微胶囊粉末,并对其理化特性等进行分析。结果表明,5%hWPI、5%WPI和5%MD制备的鱼油纳米乳状液粒径呈单峰分布,微胶囊表面几乎无缝隙和裂痕,包埋率可达96.5%。姜黄素的添加对乳状液的粒径、ζ-电位以及微胶囊的包埋率没有显著影响,但是能显著提高微胶囊的复溶性(由74.65%提升至82.01%),并略提高其热稳定性,原因可能在于姜黄素和蛋白质之间存在疏水相互作用和氢键,两者形成可溶性复合物。随着姜黄素添加量的提高,更多的姜黄素吸附在油-水界面上,延缓了多不饱和脂肪酸的降解,提高了微胶囊粉末的氧化稳定性。0.2%姜黄素微胶囊在45℃贮藏35 d后,姜黄素、二十碳五烯酸、二十二碳六烯酸的保留率分别为81%、39%和39%。本研究可为功能性油脂及多酚类相关工业化微胶囊产品开发提供参考。
文摘Copper oxide cluster ions CunOm n=1-22, m=1-12 are generated by 523 nm laser ablation of CuCO3 solid sample with Time of Flight Mass Spectrometer detection.By changing precursor, we get sbolar TOF MS from Cu(NO3)2 sample, but narrower mass distribution from CuO sample. We suggest that this is caused by collisionally stabilization. Small gas molecules CO2 and NO2, generated by laser ablation of CuCO3 and Cu(NO3)2, act as bther gas in supersonic molecular bearns, and they are helpful for the production of high mass clusters.
基金Project(2015M580702)supported by the China Postdoctoral Science FoundationProject(51608541)supported by the National Natural Science Foundation of ChinaProject(2014122006)supported by the Guizhou Provincial Department of Transportation Foundation,China
文摘Two calculation modes for the effect of external load on slope stability, i.e., mode I in which the external load is thought to act on slope surface, and mode II in which the external load is thought to act on slip surface along the force action line, were considered. Meanwhile, four basic distribution patterns of external load were used, of which complex external loads could be composed. In analysis process, several limit equilibrium methods, such as Swedish method, simplified Bishop method, simplified Janbu method, Spencer method, Morgenstern-Price(M-P) method, Sarma method, and unbalanced thrust method, were also adopted to contrast their differences in slope stability under the external load. According to parametric analysis, some conclusions can be obtained as follows:(1) The external load, with the large magnitude, small inclination angle, and acting position close to the slope toe,has more positive effect on slope stability;(2) The results calculated using modes I and II of external load are similar, indicating that the calculation mode of external load has little influence on slope stability;(3) If different patterns of external loads are equivalent to each other, their slope stability under these external loads are the same, and if not, the external load leads to the better slope stability,as action position of the resultant force for external load is closer to the lower sliding point of slip surface.
