The in vivo bioavailability of soy protein isolates and corn zein film material before and after film formation by heat/ pressure was determined. The In vitro digestibility of corn zein before and after film formation...The in vivo bioavailability of soy protein isolates and corn zein film material before and after film formation by heat/ pressure was determined. The In vitro digestibility of corn zein before and after film formation was also measured. Films were produced from anhydrous protein with 30% glycerol added using a heat-press method with no use of casting solvents or cross-linking agents. Corn zein raw and film material were ground under liquid nitrogen then digested in two enzyme-acid cocktails with free amino acid analysis before and after digestion. The protein efficiency ratio and net protein ratio were determined for both zein and soy protein using a weanling Sprague-Dawley descended rat feeding study. The In vitro digestibility study indicated that the non-heat pressed corn zein was more digestible than the heat pressed zein. However, the in vivo results indicated that corn and soy protein were equally bioavailable whether they were derived from film mixture prior to or after film formation. Both corn zein and soy protein material had lower protein efficiency ratio than the control diet. Furthermore, soy protein films materials had a higher protein efficiency ratio than corn zein.展开更多
Sodium implanted titanium films with different ion doses were characterized to correlate their ion implantation parameters. Native titanium films and ion implanted titanium films were characterized with combined techn...Sodium implanted titanium films with different ion doses were characterized to correlate their ion implantation parameters. Native titanium films and ion implanted titanium films were characterized with combined techniques of X-ray photoelectron spectroscopy （XPS）, atomic force microscopy （AFM）, and light microscopy （LM）. The surface presented increased sodium concentration on treated titanium films with ion dose increasing, except for the group with the highest ion dose of 4×10^17ions/cm^2. XPS depth profiling displayed that sodium entered titanium film around 25-50nm depth depending on its implantation ion dose. AFM characterization showed that sodium ion implantation treatment changed the surface morphology from a relatively smooth titanium film to rough surfaces corresponding to different implantation doses. After sodium implantation, implanted titanium films presented big particles with island structure morphology. The surface morphology and particle growth displayed the corresponding trend. Fibrinogen adsorption on these titanium films was performed to correlate with the surface properties of treated titanium films. The results show that protein adsorption on ion-implanted samples with dose of 2×10^17 and 4×10^17 are statistically higher （p 〈0.01） than samples treated with dose of 5×10^16 and 1×10^17, as well as the control samples.展开更多
The approaching of two hydrophobic surfaces in water will lead to the combination of air bubbles adsorbed on the surfaces, thus additional long_range attraction is induced due to the bridging capillary force. Theoreti...The approaching of two hydrophobic surfaces in water will lead to the combination of air bubbles adsorbed on the surfaces, thus additional long_range attraction is induced due to the bridging capillary force. Theoretical analysis shows that the process is a first_order phase transition, while no direct experiment supports the predication. The interaction between protein modified tip of atomic force microscope and protein film on mica was studied. The results demonstrate that the adhesion force between them increases to a stable value during the calibration process and the evolution clearly indicates the character of first_order transition.展开更多
In this study, soybean residues were treated with HCl and soybean residue cellulose was extracted, which was used to prepare cellulose nanofiber (CNF) using the high-pressure homogenization method. The maximum yield o...In this study, soybean residues were treated with HCl and soybean residue cellulose was extracted, which was used to prepare cellulose nanofiber (CNF) using the high-pressure homogenization method. The maximum yield of CNF, the reaction temperature, reaction time, and HCl concentration were optimized. The optimum HCl concentration for acid treatment was 6%, the reaction time was 60 min, the reaction temperature was 80℃, and the maximum yield of soybean residue cellulose was 78.8%. The different CNF films were then prepared;the color, mechanical property, and light transmittance of the CNF films were studied. Compared to the properties of the CNF film prepared with the soybean residue cellulose by high-pressure homogenization 15 times (HGT-15 film), the mechanical properties of the CNF film with soybean residue cellulose by decolorizing treatment decreased, but the light transmittance increased. The film prepared by adding HGT- 15 CNF to whey protein was investigated for its mechanical property, light transmittance, and solubility. Unlike the pure whey protein film, addition of 2.0% CNF to the whey protein enhanced the mechanical property and water vapor transmission rate (WVT) of the film. With the increase in CNF content, the solubility of the whey protein film decreased, and then stabilized.展开更多
为减轻石油基包装材料带来的环境压力,研制天然、易降解的环保型大豆蛋白基食品包装膜现已成为当前研究热点。本文检索了Web of Science核心合集数据库(WOS)1990~2021年间关于大豆蛋白基食品包装膜的研究论文,运用科学知识图谱工具CiteS...为减轻石油基包装材料带来的环境压力,研制天然、易降解的环保型大豆蛋白基食品包装膜现已成为当前研究热点。本文检索了Web of Science核心合集数据库(WOS)1990~2021年间关于大豆蛋白基食品包装膜的研究论文,运用科学知识图谱工具CiteSpace5.8.R3可视化处理了1318篇相关文献,结合文献资料法、定量分析法对大豆蛋白基食品包装膜的研究热点变化及发展态势进行深入探讨和分析。结果表明,大豆蛋白基食品包装膜的研究历程可分为初级起步、稳步发展和加速发展3个阶段,现今正处于加速发展阶段;中国发文量排名第一体现其在该领域巨大的发展潜力;美国的中介中心性值为0.59,表明其已具备较高的科研实力;《Food Hydrocolloids》为该领域具有引领力的期刊;大豆蛋白基食品包装膜的改性和食品包装应用为主流研究;未来研究趋向于搭载天然生物活性化合物的绿色食品包装膜开发。展开更多
文摘The in vivo bioavailability of soy protein isolates and corn zein film material before and after film formation by heat/ pressure was determined. The In vitro digestibility of corn zein before and after film formation was also measured. Films were produced from anhydrous protein with 30% glycerol added using a heat-press method with no use of casting solvents or cross-linking agents. Corn zein raw and film material were ground under liquid nitrogen then digested in two enzyme-acid cocktails with free amino acid analysis before and after digestion. The protein efficiency ratio and net protein ratio were determined for both zein and soy protein using a weanling Sprague-Dawley descended rat feeding study. The In vitro digestibility study indicated that the non-heat pressed corn zein was more digestible than the heat pressed zein. However, the in vivo results indicated that corn and soy protein were equally bioavailable whether they were derived from film mixture prior to or after film formation. Both corn zein and soy protein material had lower protein efficiency ratio than the control diet. Furthermore, soy protein films materials had a higher protein efficiency ratio than corn zein.
文摘Sodium implanted titanium films with different ion doses were characterized to correlate their ion implantation parameters. Native titanium films and ion implanted titanium films were characterized with combined techniques of X-ray photoelectron spectroscopy （XPS）, atomic force microscopy （AFM）, and light microscopy （LM）. The surface presented increased sodium concentration on treated titanium films with ion dose increasing, except for the group with the highest ion dose of 4×10^17ions/cm^2. XPS depth profiling displayed that sodium entered titanium film around 25-50nm depth depending on its implantation ion dose. AFM characterization showed that sodium ion implantation treatment changed the surface morphology from a relatively smooth titanium film to rough surfaces corresponding to different implantation doses. After sodium implantation, implanted titanium films presented big particles with island structure morphology. The surface morphology and particle growth displayed the corresponding trend. Fibrinogen adsorption on these titanium films was performed to correlate with the surface properties of treated titanium films. The results show that protein adsorption on ion-implanted samples with dose of 2×10^17 and 4×10^17 are statistically higher （p 〈0.01） than samples treated with dose of 5×10^16 and 1×10^17, as well as the control samples.
文摘The approaching of two hydrophobic surfaces in water will lead to the combination of air bubbles adsorbed on the surfaces, thus additional long_range attraction is induced due to the bridging capillary force. Theoretical analysis shows that the process is a first_order phase transition, while no direct experiment supports the predication. The interaction between protein modified tip of atomic force microscope and protein film on mica was studied. The results demonstrate that the adhesion force between them increases to a stable value during the calibration process and the evolution clearly indicates the character of first_order transition.
基金supported by the foundation of State Key Laboratory of Pulp and Paper Engineering (201819)the project of Shaanxi Provincial Department of Education Key Laboratory Research Open Fund (Grant No. 17JS017)the project of Shaanxi University of Science and Technology Research Initial Fund (Grant No. BJ15-29)
文摘In this study, soybean residues were treated with HCl and soybean residue cellulose was extracted, which was used to prepare cellulose nanofiber (CNF) using the high-pressure homogenization method. The maximum yield of CNF, the reaction temperature, reaction time, and HCl concentration were optimized. The optimum HCl concentration for acid treatment was 6%, the reaction time was 60 min, the reaction temperature was 80℃, and the maximum yield of soybean residue cellulose was 78.8%. The different CNF films were then prepared;the color, mechanical property, and light transmittance of the CNF films were studied. Compared to the properties of the CNF film prepared with the soybean residue cellulose by high-pressure homogenization 15 times (HGT-15 film), the mechanical properties of the CNF film with soybean residue cellulose by decolorizing treatment decreased, but the light transmittance increased. The film prepared by adding HGT- 15 CNF to whey protein was investigated for its mechanical property, light transmittance, and solubility. Unlike the pure whey protein film, addition of 2.0% CNF to the whey protein enhanced the mechanical property and water vapor transmission rate (WVT) of the film. With the increase in CNF content, the solubility of the whey protein film decreased, and then stabilized.
文摘为减轻石油基包装材料带来的环境压力,研制天然、易降解的环保型大豆蛋白基食品包装膜现已成为当前研究热点。本文检索了Web of Science核心合集数据库(WOS)1990~2021年间关于大豆蛋白基食品包装膜的研究论文,运用科学知识图谱工具CiteSpace5.8.R3可视化处理了1318篇相关文献,结合文献资料法、定量分析法对大豆蛋白基食品包装膜的研究热点变化及发展态势进行深入探讨和分析。结果表明,大豆蛋白基食品包装膜的研究历程可分为初级起步、稳步发展和加速发展3个阶段,现今正处于加速发展阶段;中国发文量排名第一体现其在该领域巨大的发展潜力;美国的中介中心性值为0.59,表明其已具备较高的科研实力;《Food Hydrocolloids》为该领域具有引领力的期刊;大豆蛋白基食品包装膜的改性和食品包装应用为主流研究;未来研究趋向于搭载天然生物活性化合物的绿色食品包装膜开发。
