压榨饼残油含量的快速测定方法
作者:
王彪;乔星亚;余春艳;刘晔
期刊:
粮食与油脂 ,2019年32(11):74-78 ISSN:1008-9578
作者机构:
武汉轻工大学化学与环境工程学院,湖北武汉,430023;[王彪; 乔星亚; 刘晔; 余春艳] 武汉轻工大学
关键词:
压榨制油;压榨饼;残油含量;快速测定;紫外光谱
摘要:
为满足工厂试验及大数据研究对压榨饼残油含量的即时化测定需求,建立了基于压榨毛油紫外光特征吸收的快速测定方法。以庚烷-乙醇混和溶剂萃取压榨饼,采集所得萃取液紫外吸收的D255值(255 nm处一阶导数放大100倍),再根据标准曲线计算压榨饼残油含量,可通用于菜籽直接压榨、低温压榨、脱皮压榨、高温压榨和预榨等多种工艺效果的评价。该方法同样适用于花生仁、紫苏籽、亚麻籽等多种油料压榨饼残油含量的测定,且变异系数不大于4.27%,测定回收率在95.12%~104.04%之间。
语种:
中文
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复炼菜籽废油的紫外光谱辨识指标
作者:
余盖文;刘晔;王明明;李云雁;刘大川
期刊:
食品科学 ,2019年40(20):311-317 ISSN:1002-6630
作者机构:
武汉轻工大学化学与环境工程学院,湖北 武汉,430023;武汉轻工大学食品科学与工程学院,湖北 武汉,430023;[余盖文; 李云雁; 刘晔; 刘大川; 王明明] 武汉轻工大学
关键词:
复炼菜籽废油;紫外光谱;特征参数;辨识指标;分支判别
摘要:
为确立餐饮废油的快速、可靠辨识指标,以菜籽油为样本考察加工、使用及复炼等多种热处理对油脂紫外光谱的影响。采用0.05 mm薄膜样品池采集油样紫外吸收光谱可获得特征参数D245 nm和R272 nm,分别用以表征油中二元及三元共轭结构产物的多寡。结果表明,菜籽油经正常精炼热处理后,其紫外光谱特征参数D245 nm和R272 nm值分别不超过4.8和12.9。高温氧化可导致上述特征参数的大幅上升,而复炼处理也不能降低R272 nm值。由此利用特征参数D245 nm和R272 nm值边界值及分支判别流程可将正常加工的菜籽油与高温氧化油或复炼氧化油区分开来,对于复炼脱臭油掺杂的检出限为2.3%。
语种:
中文
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化学化工类专业英语教学实践与心得
作者:
王明明;游军杰;刘晔
期刊:
当代教育实践与教学研究 ,2019年(01):186-187 ISSN:2095-6711
作者机构:
武汉轻工大学化学与环境工程学院
关键词:
化学化工;专业英语;教学改革
摘要:
探索化学化工类专业英语课程教学,对具有较高英语水平的专业知识人才培养有重要的现实意义。首先,本文基于学生的厌学情绪和不重视专业英语学习的现状,强调专业英语学习的重要性,以增强学生学习的动力;其次,针对教学过程分析,阐明专业英语教学对教师的要求,要提高师资队伍水平;最后,笔者结合自己的教学实践及心得,从改革课程评价方式、充分调动课堂氛围、善于利用现代化教学手段以及把课堂交给学生等方面,提出改进专业英语教学方法的建议和措施。
语种:
中文
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Preparation of electrolyzed oxidizing water by TiO2 doped IrO2-Ta2O5 electrode with high selectivity and stability for chlorine evolution
作者:
Deng, Li;Liu, Yi;Zhao, Gan;Chen, Jiahao;He, Shufan;...
期刊:
Journal of Electroanalytical Chemistry ,2019年832:459-466 ISSN:1572-6657
通讯作者:
Ren, Zhandong
作者机构:
[Deng, Li; He, Shufan; Zhu, Yuchan; Liu, Yi; Chai, Bo; Chen, Jiahao; Ren, Zhandong; Zhao, Gan] Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Hubei, Peoples R China.
通讯机构:
[Ren, Zhandong] W;Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Hubei, Peoples R China.
关键词:
Chlorine;Cyclic voltammetry;Decomposition;Iridium compounds;Scanning electron microscopy;Sodium chloride;Tantalum oxides;Titanium dioxide;Viruses;Chlorine content;Chlorine evolution;Electrolyzed oxidizing water;Oxygen evolution reaction;Service lifetime;Electrochemical electrodes
摘要:
Electrolyzed oxidizing water (EO water) is a new disinfectant, which has been proved to possess the high bactericidal efficiency against a wide variety of microorganisms ranging from bacteria to viruses. EO water is generated by electrolysis of an extremely dilute NaCl solution. Therefore, it is necessary to enhance the selectivity of chlorine evolution reaction (CER), which the oxygen evolution side reaction (OER) needs to be minimized. In the present study, the TiO2 doped IrO2-Ta2O5 (IrO2-Ta2O5-TiO2) electrode was prepared by the thermal decomposition method. X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF) characterizations were employed to study the performances the IrO2-Ta2O5-TiO2 electrode. The electrochemical behaviors and actives of the IrO2-Ta2O5-TiO2 electrode coupled with the IrO2-Ta2O5 electrode was investigated using cyclic voltammetry (CV) and linear sweep voltammetry (LSV). Furthermore, the selectivity of CER was analyzed through the potential difference between the CER and OER at a constant current density to illustrate the discrepancy in available chlorine content (ACC) of two kinds of oxide electrodes in the EO water preparation. In addition, the accelerated service lifetime of the IrO2-Ta2O5-TiO2 electrode was also discussed in this article. © 2018 Elsevier B.V.
语种:
英文
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Present status on removal of raffinose family oligosaccharides - a Review
作者:
Zhang, Jian* ;Song, Guangsen;Mei, Yunjun;Li, Rui;Zhang, Haiyan;...
期刊:
CZECH JOURNAL OF FOOD SCIENCES ,2019年37(3):141-154 ISSN:1212-1800
通讯作者:
Zhang, Jian
作者机构:
[Zhang, Jian; Song, Guangsen; Mei, Yunjun; Li, Rui; Zhang, Haiyan; Liu, Ye] Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan, Hubei, Peoples R China
通讯机构:
[Zhang, Jian] W;Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan, Hubei, Peoples R China.
关键词:
alpha-galactosidase;autoclaving;cooking;germination;soaking;alpha-galactose oligosaccharides
摘要:
Raffinose family oligosaccharides (RFOs) are alpha-galactosyl derivatives of sucrose or glucose. They are found in a large variety of seeds from many different families such as beans, vegetables and whole grains. Due to absence of alpha-galactosidase in the digestive tract of humans and other monogastric animals, RFOs are responsible for intestinal disturbances (flatulence) following the ingestion of legume-derived products. Structural relationships of RFOs and their enzymatic degradation mechanism are described. Concentration and distribution from various seed sources are introduced. The present status on removal of the RFOs (such as soaking, cooking, germination, and addition of alpha-galactosidase) is summarized. At the meantime, alpha-galactosidases from botanic and microbial sources and their partial enzymatic properties are also presented in detail. Based on a comparison of various removal treatments, the microbial a-galactosidases are thought as the most optimum candidate for removing RFOs in legumes, and the ideal system for the RFO removal is proposed.
语种:
英文
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Enhancement of CO2 capture in the MDEA solution by introducing TETA or TETA-AEP mixtures as an activator
作者:
Wang, Mei* ;Rao, Na;Liu, Yuqing;Li, Jiale;Cheng, Qunpeng;...
期刊:
Separation Science and Technology ,2019年54(1):101-109 ISSN:0149-6395
通讯作者:
Wang, Mei
作者机构:
[Rao, Na; Liu, Yuqing; Cheng, Qunpeng; Li, Jianfen; Li, Jiale; Wang, Mei] Wuhan Polytech Univ, Dept Chem & Environm Engn, Wuhan, Hubei, Peoples R China.
通讯机构:
[Wang, Mei] W;Wuhan Polytech Univ, Dept Chem & Environm Engn, Wuhan, Hubei, Peoples R China.
关键词:
CO2 capture;MDEA;activator;enhancement;viscosity
摘要:
TETA or TETA-AEP mixtures were used as an activator to enhance CO<inf>2</inf> capture in the MDEA solution. The effect of amount and type of activators, and the viscosity of absorbents on CO<inf>2</inf> capture were discussed. The results showed that the positive effect of TETA-AEP mixtures on CO<inf>2</inf> capture in the MDEA solution was greater than that of TETA. The optimal absorbent was No. V, whose CO<inf>2</inf> absorption capacity/desorption efficiency was 3.08 times/1.18 times of No. І. The viscosity had a little influence on CO<inf>2</inf> absorption and an obvious effect on CO<inf>2</inf> desorption.<br/> ©2018, ©2018 Taylor & Francis.
语种:
英文
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Facile preparation of a collagen-graphene oxide composite: A sensitive and robust electrochemical aptasensor for determining dopamine in biological samples
作者:
Wei, Benmei;Zhong, Huaying;Wang, Linjie;Liu, Yong;Xu, Yuling;...
期刊:
International Journal of Biological Macromolecules ,2019年135:400-406 ISSN:0141-8130
通讯作者:
Wang, Haibo
作者机构:
[Xu, Yuling; Xu, Chengzhi; Wei, Benmei; Zhong, Huaying; Wang, Linjie; Wang, Haibo; He, Lang; Zhang, Juntao] Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Hubei, Peoples R China.;[Liu, Yong] Wuhan Technol & Business Univ, Sch Environm & Biol Engn, Wuhan 430065, Hubei, Peoples R China.
通讯机构:
[Wang, Haibo] W;Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Hubei, Peoples R China.
关键词:
Collagen;Dopamine;Electrochemical aptasensor;Graphene oxide
摘要:
A sensitive and robust electrochemical aptasensor for determining dopamine (DA) was developed using a grass carp skin collagen-graphene oxide (GCSC-GO) composite as a transducer and a label-free aptamer as a biological recognition element for the first time. In order to fabricate this sensor, the GCSC-GO composite was firstly prepared by ultra-sonication method and characterized by atomic force microscope, infrared spectroscopy, Raman spectroscopy, and electrochemical impedance spectroscopy. Subsequently, a label-free DA-binding aptamer was immobilized through strong interaction between collagen and aptamer. The fabricated electrochemical aptasensor was used to determine DA by differential pulse voltammetry. The results indicated that the peak current changes of the developed aptasensor was linear relationship with the DA concentrations from 1 to 1000 nM, and the detection limit was 0.75 nM (S/N = 3). Moreover, the fabricated aptasensor showed high selectivity for DA More importantly, the obtained aptasensor exhibited satisfactory recovery toward DA in human serum specimens with excellent stability. (C) 2019 Elsevier B.V. All rights reserved.
语种:
英文
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Structures of Complexes of Gossypol with Ferrous Sulfate Based on High-Performance Liquid Chromatography Separation, Spectroscopic Analysis, and PM3 calculations
作者:
Zhang, Jian* ;Ran, Han;Xiong, Wei;Yang, Tianyi;Mei, Yunjun;...
期刊:
ChemistrySelect ,2019年4(19):5484-5488 ISSN:2365-6549
通讯作者:
Zhang, Jian;Song, Guangsen
作者机构:
[Liu, Ye; Cheng, Qunpeng; Zhang, Jian; Mei, Yunjun; Song, Guangsen; Li, Shenglan; Zhang, J; Song, GS; Yang, Tianyi; Ran, Han; Xiong, Wei] Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Hubei, Peoples R China.;[He, Dongping] Wuhan Polytech Univ, Sch Food Sci & Technol, Wuhan 430023, Hubei, Peoples R China.
通讯机构:
[Zhang, J; Song, GS] W;Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Hubei, Peoples R China.
关键词:
Iron-gossypol complex;Liquid chromatography;PM3 calculations;Spectroscopic analysis;Structure elucidation
摘要:
The complexes of gossypol with Fe2+ were prepared by using methanol as solvent in the presence of CO2 atmosphere. The results from FT-IR spectra analysis indicated that the aromatic aldehyde groups in gossypol molecules were entirely involved in coordination with Fe2+. UV-Vis absorption spectrum of the complexes in methanol solution displays blue-shift in comparison with that of gossypol. Five compounds from the complexes were isolated by high performance liquid chromatography. The structures of the complexes are consistent with PM3 calculations. Two compounds were formed by coordination of gossypol with Fe2+ at 1:2 molar ratio, other three compounds were formed by chelation of gossypol with Fe2+ at molar ratio by 1:1, 1:3, and 1:4 respectively.
语种:
英文
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菜籽油精炼热处理对紫外光谱的影响
作者:
余盖文;刘晔;王明明;李云雁;刘大川
期刊:
中国粮油学报 ,2018年33(6):45-50 ISSN:1003-0174
通讯作者:
Liu, Y.
作者机构:
[余盖文; 李云雁; 王明明; 刘晔] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, 430023, China;[刘大川] College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, 430023, China
通讯机构:
School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, China
关键词:
精炼;热处理;紫外光谱;共轭结构;危害物
摘要:
考察各阶段精炼热处理对菜籽油紫外光谱的影响,为油脂精炼危害物的形成风险探索快速评估方案。采用0.05 mm光程薄膜样品池采集菜籽油的紫外吸收光谱并提取D245和R272两个参数,分别用以表征油中二元和三元共轭结构的多寡,进而评估精炼危害物的形成风险。结果表明,脱胶、脱酸、脱色操作热处理均可导致油中二元和三元共轭结构缓慢累积;而在脱臭操作中,油中二元和三元共轭结构的累积速率分别可达之前3个操作的11倍和33倍以上。二元和三元共轭结构的累积与精炼热处理程度及异构、聚合产物生成具有密切关联,因此D245和R272两个参数可用作精炼危害物的快速定量评估指标。
语种:
中文
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4种油料压榨饼的品质评价
作者:
程园园;刘大川;刘晔;张麟
期刊:
中国油脂 ,2016年41(4):29-31 ISSN:1003-7969
作者机构:
武汉轻工大学食品科学与工程学院, 武汉, 430023;武汉轻工大学化学与环境工程学院, 武汉, 430023;武汉轻工大学机械工程学院, 武汉, 430023;[程园园; 刘大川] 武汉轻工大学食品科学与工程学院, 武汉, 430023;[刘晔] 武汉轻工大学化学与环境工程学院, 武汉, 430023
关键词:
压榨饼;粗蛋白质含量;氮溶指数;氨基酸组成
摘要:
对油菜籽、亚麻籽、紫苏籽、花生仁4种油料及在适宜条件下压榨所得压榨饼的粗蛋白质含量、氮溶指数、氨基酸组成及含量的变化进行评价。结果显示:亚麻籽饼、菜籽饼、花生饼和紫苏籽饼中粗蛋白质含量均比4种油料的粗蛋白质含量明显增加,其氮溶指数与油料相比也相应增加;4种压榨饼的赖氨酸含量均较油料明显上升。这说明压榨过程中,由于压榨温度低、受热时间短,随着油料所含油脂被压榨出来,压榨饼中蛋白质含量得以升高,饼中蛋白质尚未变性或稍有变性,这为压榨饼的蛋白质资源开发利用创造了有利条件。
语种:
中文
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紫苏籽、花生仁压榨特性的研究
作者:
程园园;刘大川;刘晔;张麟
期刊:
中国粮油学报 ,2016年31(5):100-105 ISSN:1003-0174
通讯作者:
Liu, Y.
作者机构:
[程园园; 刘大川] Department of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, 430023, China;[刘晔] Department of Environmental and Chemical Engineering, Wuhan Polytechnic University, Wuhan, 430023, China;[张麟] Department of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 430023, China
通讯机构:
Department of Environmental and Chemical Engineering, Wuhan Polytechnic University, Wuhan, China
关键词:
紫苏籽;花生仁;压榨特性
摘要:
为了开展油料产地化低残油压榨技术装备研究,以紫苏籽、花生仁为原料,研究2种油料的物性(包括原料成分及硬度和脆性)。采用小型榨油机(该机为榨螺和榨轴一体的单螺杆榨油机,测量并计算其理论压缩比为11)压榨,以压榨饼残油率为指标,考察油料入榨含水量,入榨温度,环境温度等因素对2种油料压榨饼残油率的影响。通过正交试验优化得到最佳压榨工艺条件为:入榨水分为4%, 入榨温度为65℃, 环境温度为30℃,在最佳工艺条件下,紫苏籽压榨饼残油率为9.82%;花生仁压榨饼残油率为8.21%。由于出饼温度小于80 ℃,随着紫苏籽压榨饼和花生仁压榨饼中蛋白质含量增加,其氮溶指数与原料相比也有所增加,说明蛋白质尚未变性。另外,利用透射电镜对2种油料种子子叶细胞及最佳工艺条件下的压榨饼进行微观结构观察。证实了油料种籽子叶细胞中油脂以脂类体形式储存在细胞的内质网状结构以及蛋白体和糊粉粒的间隙中,压榨时在外力挤压作用下油料细胞结构严重变形并被破坏,油被压榨出并同时实现与饼的液-固分离。
语种:
中文
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Electrooptical properties of new type fluorinated phenyl-tolane isothiocyanate liquid crystal compounds
作者:
Peng, Zenghui;Wang, Qidong;Liu, Yonggang;Mu, Quanquan;Cao, Zhaoliang;...
期刊:
Liquid Crystals ,2016年43(2):276-284 ISSN:0267-8292
通讯作者:
Xuan, Li
作者机构:
[Xuan, Li; Zhang, Peiguang; Yang, Chengliang; Yao, Lishuang; Wang, Qidong; Cao, Zhaoliang; Xu, Huanyu; Liu, Yonggang; Peng, Zenghui; Mu, Quanquan] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Appl Opt, Changchun, Peoples R China.;[Zhang, Zhiyong] Wuhan Polytech Univ, Dep Chem & Environm Engn, Wuhan, Peoples R China.
通讯机构:
[Xuan, Li] C;Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Appl Opt, Changchun, Peoples R China.
关键词:
Phenyl-tolane;electrooptical property;high birefringence;isothiocyanate liquid crystals
摘要:
A series of 4ʹ-(4-alkyl-phenyl)-2ʹ,6ʹ-difluorotolane isothiocyanate liquid crystal (LC) compounds were synthesised, and their phase transitions and electrooptical properties were investigated. These compounds exhibit high birefringence, about 0.47–0.52. As the number of carbon atoms in the alkyl chains increases, these LC compounds can exhibit smectic phases. When these LCs were mixed into the commercial LCs, the birefringence values of LC mixtures become higher than pure commercial LCs, and the visco-elastic coefficients of five LC mixtures are very close to each other at every test temperature. The results of response properties indicate that the compounds with a tri-fluorine substitution and n-propyl end group possess better response performance than the others. These LC compounds are particularly attractive for achieving fast response times in LC optic devices. © 2015 Taylor & Francis.
语种:
英文
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4种油料压榨油的品质评价
作者:
程园园;刘大川;刘晔;张麟
期刊:
中国油脂 ,2016年41(1):7-10 ISSN:1003-7969
作者机构:
武汉轻工大学食品科学与工程学院, 武汉, 430023;武汉轻工大学化学与环境工程学院, 武汉, 430023;武汉轻工大学机械工程学院, 武汉, 430023;[程园园; 刘大川] 武汉轻工大学食品科学与工程学院, 武汉, 430023;[刘晔] 武汉轻工大学化学与环境工程学院, 武汉, 430023
关键词:
压榨;亚麻籽油;花生油;菜籽油;紫苏籽油;水化脱胶;理化指标;卫生指标
摘要:
以紫苏籽、亚麻籽、油菜籽和花生仁4种高含油油料为研究对象,将其在适宜的工艺条件下进行压榨和水化脱胶,对所得毛油及水化脱胶油的理化指标和卫生指标进行检测和分析比较。结果显示:经水化脱胶后菜籽油、紫苏籽油优于压榨四级菜籽油,接近压榨三级菜籽油国家标准(GB 1536-2004),亚麻籽油符合压榨一级亚麻籽油国家标准(GB/T 8235-2008),花生油符合压榨一级花生油国家标准(GB 1534-2003);4种压榨油的总砷、铅、黄曲霉毒素B_1、苯并(a)芘含量均未检出(GB 2716-2005),农药残留未检出;4种压榨油富含不饱和脂肪酸,紫苏籽油和亚麻籽油富含α-亚麻酸;水化脱胶后,4种压榨油的植物甾醇含量均明显降低,维生素E含量略有降低。
语种:
中文
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高选择性的菜籽蛋白含量测定方法
作者:
沈娜娜;刘晔;刘大川;钟启新
期刊:
中国粮油学报 ,2015年30(2):107-111 and 117 ISSN:1003-0174
通讯作者:
Liu, Ye
作者机构:
[沈娜娜; 刘大川; 钟启新] College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, 430023, China;[刘晔] College of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, 430023, China
通讯机构:
College of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, China
关键词:
菜籽蛋白;真蛋白;非蛋白氮;抗干扰
摘要:
为解决菜籽蛋白原料及制品中真蛋白含量难以测定的问题,建立了一种基于分级和定量2步完成的高选择性菜籽蛋白含量测定方法。通过酸化丙酮溶液和沸水萃取实施分级处理,可将样品中的非蛋白氮分离;结合应用可溶性蛋白的染色法测定和不溶性蛋白的凯氏定氮法测定,可获得样品的真蛋白含量。该方法变异系数不大于2.83%,回收率95%~96%,并可排除本源性非蛋白氮(包括芥子碱和硫甙)及外源性非蛋白氮(包括硝酸盐、铵盐、三聚氰胺和尿素)的干扰。该方法具备良好的抗干扰能力且不受蛋白质溶解性的影响,可推广到更多的植物蛋白制品及原料的真蛋白含量测定中,并可为相关行业的掺杂辨识或品质评价提供可靠手段。
语种:
中文
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The electrocatalytic activity of IrO2-Ta2O5 anode materials and electrolyzed oxidizing water preparation and sterilization effect
作者:
Ren, Zhandong* ;Quan, Shanshan;Gao, Jie;Li, Wenyang;Zhu, Yuchan;...
期刊:
RSC Advances ,2015年5(12):8778-8786 ISSN:2046-2069
通讯作者:
Ren, Zhandong
作者机构:
[Liu, Ye; Zhu, Yuchan; Wang, Yourong; Chai, Bo; Gao, Jie; Ren, Zhandong; Li, Wenyang; Quan, Shanshan] Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Peoples R China.
通讯机构:
[Ren, Zhandong] W;Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Peoples R China.
摘要:
Ti/IrO<inf>2</inf>-Ta<inf>2</inf>O<inf>5</inf>anode electrocatalysts with different contents and preparation temperatures were prepared by thermal decomposition in this work. The crystallite characterization and morphology were examined via XRD and SEM. The electrochemical properties were examined via cyclic voltammetry (CV) in 0.5 M H<inf>2</inf>SO<inf>4</inf>and linear sweep voltammetry (LSV) in saturated sodium chloride. Through the study of different series of Ti/IrO<inf>2</inf>-Ta<inf>2</inf>O<inf>5</inf>anodes, we find that the preparation conditions have a great impact on the electrode catalytic activity. Experimental results indicate that the electrochemically active surface area is determined by the content and morphology of the anode coating. When the IrO<inf>2</inf>content and the preparation temperature are 70% and 500 °C, the surface of the electrode is aggregated with segregated crystallite flower-like particles, which brings about the best electrode catalytic activity. The current density in the chlorine evolution reaction of IrO<inf>2</inf>-Ta<inf>2</inf>O<inf>5</inf>(70% and 500 °C) is 0.4 A cm<sup>-2</sup>in saturated sodium chloride. The properties and sterilization effect of EO water are closely related to the electrode catalytic activity. The higher the current density is in chlorine evolution, the higher the available chlorine and HClO content. When the IrO<inf>2</inf>content is 70% and the preparation temperature is 500 °C, the maximum values of the killing logarithm value and killing rate are 3.01-3.05 and 99.9023-99.9109%, respectively. In addition, when the Ti substrate undergoes 40 minutes of activation treatment, the Ti/IrO<inf>2</inf>-Ta<inf>2</inf>O<inf>5</inf>anodes have the highest stability. ©The Royal Society of Chemistry 2015.
语种:
英文
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基于双波长紫外吸收的乳脂肪快速测定
作者:
孙婷婷;刘晔;任占冬;朱玉婵
期刊:
食品科学 ,2015年36(10):100-104 ISSN:1002-6630
作者机构:
[孙婷婷; 刘晔; 任占冬; 朱玉婵] 武汉轻工大学化学与环境工程学院
关键词:
乳脂肪;快速测定;紫外吸收;双波长;热处理
摘要:
为便于实施对乳品加工中乳品及管路残留乳脂肪含量的全面监控,建立一种基于双波长紫外吸收的乳脂肪快速定量方法。采用萃取-沉淀操作采集液态乳或加工管壁样本中的乳脂肪并直接测定204 nm和230 nm 2个波长处的吸光度,再基于吸光度差ΔA_(204 nm-230 nm)和乳脂肪标准曲线方程可确定样本中的乳脂肪含量。对于液态乳品样本,该方法的变异系数不大于3%,回收率在95.6%~102.9%之间,并可有效避免乳品热处理差异的干扰。此外,该方法也可成功用于不同加工条件下乳品加工管路中乳脂肪管壁残留量的测定。
语种:
中文
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菜籽蛋白和酚的固- 液相平衡
作者:
刘晔;沈娜娜;刘大川
期刊:
中国油脂 ,2015年40(8):17-21 ISSN:1003-7969
作者机构:
[刘晔] 武汉轻工大学化学与环境工程学院;[沈娜娜; 刘大川] 武汉轻工大学食品学院
关键词:
菜籽蛋白;酚;相互作用;固-液相平衡;分配系数
摘要:
为探索消除菜籽蛋白中酚污染的技术途径,采用菜籽蛋白沉淀率和菜籽蛋白- 酚分配系数为指标,考察了菜籽蛋白与酚共存体系的固- 液相平衡关系,并基于相行为特征提出了菜籽蛋白提取工艺的改进措施。结果表明: 在碱性环境下,酚酸和单宁均可与菜籽蛋白发生共沉淀作用,且浓度越高该作用越显著; 在pH 4环境下,菜籽蛋白不仅溶解度最低,而且与单宁或菜籽多酚的结合作用最弱; 而在溶液中添加1%的NaCl 有利于进一步提升菜籽蛋白和酚的分离效果。在菜籽蛋白的富集或提取工艺中,溶剂用量(液固比)、pH 以及盐添加量都可对菜籽蛋白和酚的相互作用产生影响,对这些参数的优化将有利于提高菜籽蛋白提取的选择性并降低酚的混杂。
语种:
中文
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Ir_(0.5)Pt_(0.5)O_2阳极的电催化活性及氧化电解水制备
作者:
高洁;朱玉婵;任占冬;李文阳;全姗姗;...
期刊:
化工学报 ,2015年66(3):992-1000 ISSN:0438-1157
通讯作者:
Zhu, Yuchan(zhuyuchan@163.com)
作者机构:
[高洁; 朱玉婵; 任占冬; 李文阳; 全姗姗; 刘晔; 王又容; 柴波] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan;Hubei;430023, China;[高洁; 朱玉婵; 任占冬; 李文阳; 全姗姗; 刘晔; 王又容; 柴波] Hubei;[高洁; 朱玉婵; 任占冬; 李文阳; 全姗姗; 刘晔; 王又容; 柴波] 430023, China
关键词:
Ir0.5Pt0.5O2复合材料;电解;析氯;析氧;反应动力学
摘要:
氧化电解水作为一种新型、高效、环保的杀菌剂,具有广阔的应用前景。但目前在氧化电解水制备过程中,其阳极电催化材料存在效率低和使用寿命短等问题。采用亚当斯融合法制备了Ir_(0.5)Pt_(0.5)O_2复合氧化物电极。通过XRD表征,其晶型为典型的金红石型结构。SEM结果表明虽然颗粒之间存在团聚现象,但是可以明显观察到大量蜂窝状结构存在,提高了催化剂的比表面积和电化学面积。进一步的CV表征证明了这一点,同时在CV图中表现出明显的铂铱复合氧化物结构的特征。利用LSV技术分别考察了Ir_(0.5)Pt_(0.5)O_2的析氯和析氧极化曲线,发现其单位表观面积上析氯活性明显提高,而析氧活性明显降低。计算表明Ir_(0.5)Pt_(0.5)O_2的析氯反应Tafel斜率为56.3 mV·dec~(-1),反应机理为Volmer-Heyrovsky机理,速控步骤为电化学脱附步骤;其析氧反应Tafel斜率为126.6 mV·dec~(-1),控速步骤为催化剂表面氢氧化物的形成。进一步电化学阻抗实验表明在1 g·L~(-1) NaCl溶液中, Ir_(0.5)Pt_(0.5)O_2析氯电催化活性优于IrO_2,这与前面研究结果一致。在此基础上,以Ir_(0.5)Pt_(0.5)O_2/Ti为阳极制备氧化电解水,在相同条件下,其有效氯含量明显优于IrO_2/Ti,同时电解效率也明显提高,强化试验寿命是IrO_2/Ti的3.14倍,大大提高了电极性能,有利于其商品化使用。
语种:
中文
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菜籽粕加工废水中蛋白质的回收
作者:
沈风梅;刘晔;刘大川
期刊:
中国油脂 ,2014年39(3):60-64 ISSN:1003-7969
作者机构:
[沈风梅; 刘晔] 武汉轻工大学化学与环境工程学院;[刘大川] 武汉轻工大学食品学院
会议名称:
中国粮油学会油脂分会第二十二届学术年会暨产品展示会
会议时间:
2013-09-01
会议地点:
上海
会议论文集名称:
中国粮油学会油脂分会第二十二届学术年会暨产品展示会论文集
关键词:
菜籽蛋白;回收;菜籽粕加工废水;碱性热处理;酸诱导热变性
摘要:
采用碱性热处理结合酸诱导热变性,从菜籽粕加工废水中回收蛋白质。经单因素实验和正交实验得出最优工艺条件为:热处理pH 10,热处理温度70℃,热处理时间10 min,酸沉pH2.5。在最优工艺条件下,所得蛋白质回收率和干基蛋白质含量分别达到62.11%和65.48%。
语种:
中文
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油菜籽、亚麻籽压榨特性的研究
作者:
程园园;刘大川;刘晔;张麟
期刊:
中国油脂 ,2014年39(11):12-15 ISSN:1003-7969
作者机构:
武汉轻工大学 食品科学与工程学院,武汉,430023;武汉轻工大学 环境与化学工程学院,武汉,430023;武汉轻工大学 机械工程学院,武汉,430023;[程园园; 张麟; 刘晔; 刘大川] 武汉轻工大学
关键词:
油菜籽;亚麻籽;压榨特性
摘要:
以油菜籽、亚麻籽为原料,压榨饼残油率为指标,研究两种油料的压榨特性。通过单因素实验考察油料入榨水分含量、入榨温度、环境温度对两种油料压榨饼残油率的影响。在单因素实验基础上,通过正交实验优化得到: 油菜籽最佳压榨工艺条件为入榨水分含量3%、入榨温度65℃、环境温度25℃,在最佳工艺条件下油菜籽压榨饼残油率为9.32%; 亚麻籽最佳压榨工艺条件为入榨水分含量3%、入榨温度65℃、环境温度30℃,在最佳工艺条件下亚麻籽压榨饼残油率为8.01%。物性测试结果表明,亚麻籽的硬度、脆性大于油菜籽的; 两种油料子叶细胞及其压榨饼的透射电镜结果表明,经过压榨油料细胞结构严重变形并被破坏,实现了油脂与压榨饼的液固分离。
语种:
中文
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