Enhanced H2 evolution and the interfacial electron transfer mechanism of titanate nanotube sensitized with CdS quantum dots and graphene quantum dots

Synergistic the modulation of photon absorption capability and interfacial charge transfer of the photocatalyst are highly required for developing high-performance heterojunction photocatalysts. The ternary CdS-graphene quantum dots-titanate nanotubes (CdS-GQDs-TNTs) nanocomposite have been prepared by an in situ growth method. The physicochemical characterization reveals that the GQDs are firmly decorated on both inner and outer surface of TNT through the formation of Ti–O–C chemical bonding, and CdS QDs are loaded on the outer surface of TNTs through strong interfacial interaction. The intimate integrated CdS-GQDs-TNTs nanocomposite exhibits much superior photocatalytic performance toward H₂ production compared with binary GQDs-TNTs and pure TNTs photocatalyst, which can be attributed to the combined interaction of the stronger visible light harvesting, the longer lifetime of photogenerated electron−hole pairs, faster interfacial charge transfer rate, fast and long-distance electron transport pass. The interfacial charge transfer mechanism of CdS-GQDs-TNTs ternary composite are proposed based on photoelectrochemical measurements.     

不同抗氧化剂体外抗氧化活性及其对肉品氧化稳定性的影响

为明确GB 2760-2014《食品安全国家标准食品添加剂使用标准》中允许添加至热加工肉制品使用的不同抗氧化剂的体外抗氧化活性与其抑制肉制品蛋白质氧化和脂肪氧化能力之间的关系,分别测定8种抗氧化剂的体外抗氧化活性(1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)自由...     

2015年度国家自然科学基金食品科学学科项目申请和资助情况分析

本文介绍2015年度食品科学学科国家自然科学基金项目申请、受理和资助概况,从申请数量、依托单位及各分支学科申请情况等方面比较2014年度和2015年度食品学科面上项目、青年科学基金项目和地区科学基金项目等申请和资助的特点及变化,并对项目的评议结果和创新性等评价情况进行统计分析,同时简要讨论2015年度基金项目申请中存在的问题。     

姜汁凝固型豆乳配方与工艺优化研究

以黄豆、生姜为主要原料,通过单因素及正交试验进行姜汁凝固型豆乳配方与工艺优化研究。确定其配方为豆水质量比1:7,姜汁添加量8.0g/100g 豆乳,蔗糖添加量9.0g/100g 豆乳,奶粉质量分数添加量5.0g/100g 豆乳,卡拉胶数添加量0.01g/100g 豆乳,黄原胶添加量0.02g/100g 豆乳;其凝固条件为pH6.2、温度60℃、保温5min,可制得凝胶强度较大(108.2g)、无豆腥味、香滑爽口的凝固型豆乳。     

Kinetics of relative electrical conductivity and correlation with gas composition in modified atmosphere packaged bayberries (Myrica rubra Siebold and Zuccarini)

Modified atmosphere package (MAP) was employed to store the perishable Chinese bayberry (Myrica rubra) at temperatures of 2°C, 8°C and 15°C. Electrolyte leakage from plasma could make the flesh collapse rapidly and appear to be unsavory, which may be evaluated in terms of relative electrical conductivity (REC). REC and gas composition in the headspace were measured during storage. The kinetic parameters of REC were determined, including reaction order, reaction rate constant and activation energy. An integrated model was developed to predict the REC, which reflects the cell membrane permeability, within the temperature range from 2°C to 15°C. It was found that the degree of maturity had no significant influence on gas composition in the headspace (P⪢0.05) by one-factor ANOVA analysis using SAS personal computer software. Correlation between REC and gas composition was not significant (P>0.05) by Pearson correlation analysis.     

智能指示标签的制备及其在牛肉新鲜度监测中的应用

新疆牛肉品质优良,是新疆著名的畜产品资源之一.为了实现新疆牛肉新鲜度的实时监测,本文以羧甲基纤维素、聚乙烯醇为原料,利用物理冻融法制备水凝胶,并对水凝胶的物理特性进行表征;进一步筛选紫苏色素提取物为最佳显色色素制备智能指示标签,同时研究其对新疆牛肉冷藏过程中新鲜度的智能指示效果.结果表明:聚乙烯醇与羧甲基纤维素最佳比例...     

新疆不同地区加工专用花生营养成分比较

花生生长条件和环境不同导致其品质出现差异,分析不同来源花生原料的品质有利于优化原料的选择,为花生产品加工利用提供参考。新疆南、北疆和东疆均有种植花生,但适合新疆不同地区种植的加工专用品种较少,采集新疆不同地区和内地3个省份的32个样品,对含油量、蛋白质、蔗糖、油酸/亚油酸（O/L）、蛋白亚基、氨基酸等6个指标进行测定、分析比较。结果表明,同一花生品种在不同地区种植后的营养成分含量存在一定差异,整体而言,新疆花生的含油量、蛋白质、蔗糖等指标在不同程度上优于内地,进一步分析得出花生在吐鲁番的含油量、O/L、伴花生球蛋白、总氨基酸含量最高,最高值为55.71%、35.11、37.39%、28.23 g/100 g,在阿拉尔的蛋白质、花生球蛋白含量最高,最高值为22.67 g/100 g、63.28%,在和田的蔗糖、23.5 ku亚基含量最高,为5.07 g/100 g、20.48%,在三坪的37.5 ku亚基含量最高（9.31%）。新疆不同地区不同品种花生的营养成分研究为新疆花生产业区域布局提供参考,为企业选择优质原料、建立原料基地提供依据。     

CoP/Ni2P heteronanoparticles integrated with atomic Co/Ni dual sites for enhanced electrocatalytic performance toward hydrogen evolution

Transition metal phosphides (TMPs) have attracted considerable attention as an advanced electrocatalyst for hydrogen evolution reaction (HER). Nevertheless, the catalytic efficiency of single-component TMPs is still restricted that cannot endure long-term running and easy to be corroded especially under harsh conditions. In this work, a multicomponent electrocatalyst combined with CoP/Ni₂P heteronanoparticles and Co/Ni single-atom active sites (denoted as N–C@CoP/Ni₂P) is rational designed and prepared. The obtained N–C@CoP/Ni₂P electrode material exhibits enhanced performance with the overpotential of 153 mV at 10 mA cm^?2, and the small Tafel value of 53.01 mV dec^?1 in 0.5 M H₂SO₄, and a satisfied result is obtained in basic media as well. The outstanding HER performance is mainly benefiting from the synergistic effect between CoP and Ni₂P, and the highly catalytic faction of atomic Co/Ni dual sites. Furthermore, a powerful conductive network fabricated by N-doped carbon skeleton and in-situ grown CNTs improves the conductivity of catalyst. Such a stereoscopic 3D nanostructure is also facile to accelerate the shuttle of electrons and ions.