[Objectives]This study was conducted to investigate the process conditions,function and structural characteristics of oat bran dietary fiber prepared by steam explosion(SE).[Methods]With oat bran as the raw material,t...[Objectives]This study was conducted to investigate the process conditions,function and structural characteristics of oat bran dietary fiber prepared by steam explosion(SE).[Methods]With oat bran as the raw material,the technical parameters for preparing dietary fiber by steam explosion were studied,and the functional and structural characteristics of DF before and after modification were discussed.[Results]The optimum conditions for extracting DF from oat bran by SE modification were steam explosion pressure of 0.6 MPa and holding time of 4 min.The extraction rate of DF reached 33.9%.The solubility,water holding capacity,oil holding capacity and swelling force of Control-DF were 78.35%,2.25 g/g,1.55 g/g and 3.05 ml/g,respectively,and those of SE-DF were 95.69%,3.28 g/g,2.18 g/g and 5.98 ml/g,respectively.After SE treatment,the scavenging rates of oat bran DF on DPPH,ABTS,O-2·and·OH were significantly higher than those of untreated samples.The scavenging ability on free radicals was enhanced.The scavenging rates of Control-DF on DPPH,ABTS,O-2·and·OH were 43.72%,50.26%,31.02%and 39.25%,respectively,and those of SE-DF were 70.25%,73.21%and 63.69%59.32%,respectively.The surface of modified DF showed an obvious honeycomb structure.[Conclusions]This study can provide reference for functional modifications and utilization of dietary fiber from oat bran.展开更多
The work functions of the （110） and （10（3） surfaces of LaB6 are determined from ambient pressure to 39.1 GPa. The work function of the （110） surface slowly decreases but that of the （100） surface remains at a...The work functions of the （110） and （10（3） surfaces of LaB6 are determined from ambient pressure to 39.1 GPa. The work function of the （110） surface slowly decreases but that of the （100） surface remains at a relatively constant value. To determine the reason for this difference, the electron density distribution （EDD） is determined from high-pressure single-crystal x-ray diffraction data by the maximum entropy method. The EDD results show that the chemical bond properties in LaB6 play a key role also investigated by single-crystal x-ray diffraction. In observed from ambient pressure to 39.1 GPa. The structural stability of LaB6 under high pressure is this study, no structural or electronic phase transition is展开更多
With the support of the National Natural Science Foundation of China,two original studies by the research group led by Prof.Gu Lin(谷林)and Prof.Zhang Qinghua(张庆华)from the Institute of Physics,Chinese Academy of Sc...With the support of the National Natural Science Foundation of China,two original studies by the research group led by Prof.Gu Lin(谷林)and Prof.Zhang Qinghua(张庆华)from the Institute of Physics,Chinese Academy of Sciences demonstrate the in-situ atomic-scale electrically induced展开更多
In order to evaluate to what extent will genomics and in silico related technologies improve overall drug discovery process, we analyzed three studies comparing cost, time and attrition rate at each step of the dr...In order to evaluate to what extent will genomics and in silico related technologies improve overall drug discovery process, we analyzed three studies comparing cost, time and attrition rate at each step of the drug discovery process, between standard pharmaceutical and genomics based approaches.展开更多
文摘[Objectives]This study was conducted to investigate the process conditions,function and structural characteristics of oat bran dietary fiber prepared by steam explosion(SE).[Methods]With oat bran as the raw material,the technical parameters for preparing dietary fiber by steam explosion were studied,and the functional and structural characteristics of DF before and after modification were discussed.[Results]The optimum conditions for extracting DF from oat bran by SE modification were steam explosion pressure of 0.6 MPa and holding time of 4 min.The extraction rate of DF reached 33.9%.The solubility,water holding capacity,oil holding capacity and swelling force of Control-DF were 78.35%,2.25 g/g,1.55 g/g and 3.05 ml/g,respectively,and those of SE-DF were 95.69%,3.28 g/g,2.18 g/g and 5.98 ml/g,respectively.After SE treatment,the scavenging rates of oat bran DF on DPPH,ABTS,O-2·and·OH were significantly higher than those of untreated samples.The scavenging ability on free radicals was enhanced.The scavenging rates of Control-DF on DPPH,ABTS,O-2·and·OH were 43.72%,50.26%,31.02%and 39.25%,respectively,and those of SE-DF were 70.25%,73.21%and 63.69%59.32%,respectively.The surface of modified DF showed an obvious honeycomb structure.[Conclusions]This study can provide reference for functional modifications and utilization of dietary fiber from oat bran.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11274030 and 11474281
文摘The work functions of the （110） and （10（3） surfaces of LaB6 are determined from ambient pressure to 39.1 GPa. The work function of the （110） surface slowly decreases but that of the （100） surface remains at a relatively constant value. To determine the reason for this difference, the electron density distribution （EDD） is determined from high-pressure single-crystal x-ray diffraction data by the maximum entropy method. The EDD results show that the chemical bond properties in LaB6 play a key role also investigated by single-crystal x-ray diffraction. In observed from ambient pressure to 39.1 GPa. The structural stability of LaB6 under high pressure is this study, no structural or electronic phase transition is
文摘With the support of the National Natural Science Foundation of China,two original studies by the research group led by Prof.Gu Lin(谷林)and Prof.Zhang Qinghua(张庆华)from the Institute of Physics,Chinese Academy of Sciences demonstrate the in-situ atomic-scale electrically induced
文摘In order to evaluate to what extent will genomics and in silico related technologies improve overall drug discovery process, we analyzed three studies comparing cost, time and attrition rate at each step of the drug discovery process, between standard pharmaceutical and genomics based approaches.
