为探究高压均质技术对大豆分离蛋白(soy protein isolate,SPI)乳化体系的流变学特性和氧化稳定性作用机制,研究了不同均质次数(0~4次)对SPI乳化体系流变性质和氧化稳定性的影响。结果表明:随着均质次数的增加,乳析指数呈降低趋势,平均...为探究高压均质技术对大豆分离蛋白(soy protein isolate,SPI)乳化体系的流变学特性和氧化稳定性作用机制,研究了不同均质次数(0~4次)对SPI乳化体系流变性质和氧化稳定性的影响。结果表明:随着均质次数的增加,乳析指数呈降低趋势,平均粒径、界面蛋白吸附量、表观黏度、弹性模量(G’)和黏性模量(G")均呈先增加后减小的趋势,乳液体系的氢过氧化物值(初级氧化产物)呈增加趋势,硫代巴比妥酸反应产物值(次级氧化产物)呈先增加后减少再增加的趋势。均质3次时,未见乳析现象发生,且界面蛋白吸附量、表观黏度、G’和G"达到最大,乳液体系的氢过氧化物值和硫代巴比妥酸反应产物值最低。综上,高压均质作用能够提高SPI乳液体系的稳定性、流变学性质和氧化稳定性。展开更多
In addition to the theoretical research,direct ethanol fuel cells have great potential in practical applications.The performance of direct ethanol fuel cells largely depends on the electrocatalysts.Ptbased electrocata...In addition to the theoretical research,direct ethanol fuel cells have great potential in practical applications.The performance of direct ethanol fuel cells largely depends on the electrocatalysts.Ptbased electrocatalysts have been promising candidates for advancing direct ethanol fuel cells for its high catalytic activity and great durability.Here,a PtSn catalyst with unique three-dimensional porous nanostructure has been designed and synthesized via a two-step liquid phase reduction reaction.Sn formed a self-supporting framework in PtSn alloy particles(~3.5 nm).In ethanol electro-oxidation reaction,the PtSn catalyst exhibited high mass activity and excellent recycling time compared with that of Pt/C.After the morphology characterization before and after potential cycling,the PtSn alloy-based nano-catalyst showed good stability.The PtSn catalysts effectively avoid structural instability due to the external carriers,and prolong the leaching time of Sn.In addition,the introduction of a certain amount of Sn can also solve the poisoning phenomenon of active sites on Pt surface.The design strategy of porous alloy nano-catalyst sheds light on its applications in direct ethanol fuel cells.展开更多
核桃油是我国主要的木本油脂之一。食用核桃油对人体有诸多好处,但核桃油中不饱和脂肪酸含量较高,容易发生氧化酸败,产生异味和有害物质,不但严重影响产品品质,还会对消费者的健康造成潜在威胁。提高核桃油的氧化稳定值对延长其储存期...核桃油是我国主要的木本油脂之一。食用核桃油对人体有诸多好处,但核桃油中不饱和脂肪酸含量较高,容易发生氧化酸败,产生异味和有害物质,不但严重影响产品品质,还会对消费者的健康造成潜在威胁。提高核桃油的氧化稳定值对延长其储存期、保护消费者健康均有重大意义。本文旨在讨论如何通过改进核桃油加工工艺,添加抗氧化物质和改善核桃油的包装、储存条件等多种方式来提高核桃油的氧化稳定值,以期为核桃油及其制品的加工相关企业提供理论参考。Walnut oil is one of the main woody oils in China. Eating walnut oil has many benefits to human body, but because of the high content of unsaturated fatty acids in walnut oil, it is easy to be oxidized and become rancidity, producing odour and harmful substances, which not only can seriously affect the quality of products, but also pose a potential threat to the health of consumers. Increasing the oxidation stability of walnut oil is of great significance to prolong its storage period and protect the health of consumers. The purpose of this paper is to review the research progress on oxidation stability improvement of the walnut oil, including optimizing the processing technology, adding antioxidant substances and improving the packaging and storage conditions of walnut oil, so as to provide theoretical references for the related processing enterprises of walnut oil and its products.展开更多
文摘为探究高压均质技术对大豆分离蛋白(soy protein isolate,SPI)乳化体系的流变学特性和氧化稳定性作用机制,研究了不同均质次数(0~4次)对SPI乳化体系流变性质和氧化稳定性的影响。结果表明:随着均质次数的增加,乳析指数呈降低趋势,平均粒径、界面蛋白吸附量、表观黏度、弹性模量(G’)和黏性模量(G")均呈先增加后减小的趋势,乳液体系的氢过氧化物值(初级氧化产物)呈增加趋势,硫代巴比妥酸反应产物值(次级氧化产物)呈先增加后减少再增加的趋势。均质3次时,未见乳析现象发生,且界面蛋白吸附量、表观黏度、G’和G"达到最大,乳液体系的氢过氧化物值和硫代巴比妥酸反应产物值最低。综上,高压均质作用能够提高SPI乳液体系的稳定性、流变学性质和氧化稳定性。
基金supported by the National Natural Science Foundation of China(Nos.21705036,21975067,51974115,21476066 and 51271074)Natural Science Foundation of Hunan Province,China(No.2018JJ3035)Fundamental Research Funds for the Central Universities from Hunan University。
文摘In addition to the theoretical research,direct ethanol fuel cells have great potential in practical applications.The performance of direct ethanol fuel cells largely depends on the electrocatalysts.Ptbased electrocatalysts have been promising candidates for advancing direct ethanol fuel cells for its high catalytic activity and great durability.Here,a PtSn catalyst with unique three-dimensional porous nanostructure has been designed and synthesized via a two-step liquid phase reduction reaction.Sn formed a self-supporting framework in PtSn alloy particles(~3.5 nm).In ethanol electro-oxidation reaction,the PtSn catalyst exhibited high mass activity and excellent recycling time compared with that of Pt/C.After the morphology characterization before and after potential cycling,the PtSn alloy-based nano-catalyst showed good stability.The PtSn catalysts effectively avoid structural instability due to the external carriers,and prolong the leaching time of Sn.In addition,the introduction of a certain amount of Sn can also solve the poisoning phenomenon of active sites on Pt surface.The design strategy of porous alloy nano-catalyst sheds light on its applications in direct ethanol fuel cells.
文摘核桃油是我国主要的木本油脂之一。食用核桃油对人体有诸多好处,但核桃油中不饱和脂肪酸含量较高,容易发生氧化酸败,产生异味和有害物质,不但严重影响产品品质,还会对消费者的健康造成潜在威胁。提高核桃油的氧化稳定值对延长其储存期、保护消费者健康均有重大意义。本文旨在讨论如何通过改进核桃油加工工艺,添加抗氧化物质和改善核桃油的包装、储存条件等多种方式来提高核桃油的氧化稳定值,以期为核桃油及其制品的加工相关企业提供理论参考。Walnut oil is one of the main woody oils in China. Eating walnut oil has many benefits to human body, but because of the high content of unsaturated fatty acids in walnut oil, it is easy to be oxidized and become rancidity, producing odour and harmful substances, which not only can seriously affect the quality of products, but also pose a potential threat to the health of consumers. Increasing the oxidation stability of walnut oil is of great significance to prolong its storage period and protect the health of consumers. The purpose of this paper is to review the research progress on oxidation stability improvement of the walnut oil, including optimizing the processing technology, adding antioxidant substances and improving the packaging and storage conditions of walnut oil, so as to provide theoretical references for the related processing enterprises of walnut oil and its products.