检索结果-南通市图书馆

河南省化学会2018年学术年会

作者： Sheng Lei baoxian ye College of Chemistry and Molecular Engineering Zhengzhou University

Many different DNA walker designs have previously been presented in the *** demonstrations have included walkers driven by strand exchange reactions[1],DNAzyme-mediated DNA hydrolysis[2],and nicking enzymes[3].In this work,we presented a lable-free and "signal-on" electrochemical ***,two types of DNA probes were immobilized on the Au electrode. In the presence of thrombin,the terminally protected DNA walkers were prowered by nicking endonuclease,and they exhibited autonomous cleacage behavior on the surface of the substrate DNA-modified electrode. Subsequent the cleavage of the nicking endonuclease results in recycling of the cyclic cleavage of the hairpins,liberating many free G-quadruplex forming sequences. Hemin can further bind these sequences to form G-quadruplex/hemin complexes on the sensor electrode and generate enhanced current output for the detection of low level of thrombin in a simple fashion.

关键词： Lable-Free Signal-on DNA walker Electrochemical Sensor

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Highly sensitive and simultaneous electrochemical determination of chrysin and baicalein based on Ta2O5-chitosan composite modified carbon paste electrode

Highly sensitive and simultaneous electrochemical determinat...

引用

河南省化学会2016年学术年会

作者： Zhengkun Xie Gaiping Li baoxian ye College of Chemistry and Molecular Engineering Zhengzhou University

The chrysin and baicalein are the major flavonoids found in Oroxylum indicum, an essential herb in traditional Chinese medicine for thousands of years. Owing to the similar characteristics and physiochemical property of chrysin and baicalein, the highly sensitive simultaneous electrochemical determination of chrysin and baicalein is a great challenge. In this work, a novel, simple and highly sensitive electrochemical method was proposed using a TaO nanoparticles and antiseptic chitosan modified carbon paste electrode(TaO-CTS-CPE). Scanning electron microscope(SEM), X-ray diffraction spectroscopy(XRD), Fourier transform infrared spectroscopy(FTIR), cyclic voltammetry(CV) and electrochemical impedance spectrum(EIS) were used to characterize the sensor and investigate the electrochemical response of the sensor. Under the optimum conditions, the electrochemical sensor exhibited excellent electrocatalytic activity toward the oxidation of chrysin and baicalein. The results demonstrated that the highly sensitive and simultaneous determination of chrysin and baicalein was successfully achieved and the modified electrode had a linear response range of 0.08.0 μM for both chrysin and baicalein, and the detection limits of chrysin and baicalein obtained were 0.03 and 0.05 μM(S/N=3), respectively. Furthermore, the proposed sensor displayed high sensitivity, excellent stability and satisfactory results in Oroxylum indicum samples analysis.

关键词： Simultaneous determination Ta2O5 nanoparticles Chitosan Electrochemical sensor carbon paste electrode

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A new graphene nanocomposite modified electrode as efficient voltammetric sensor for determination of eriocitrin

A new graphene nanocomposite modified electrode as efficient...

引用

河南省化学会2016年学术年会

作者： Lu Wang Qinqin Wang Kai Sheng baoxian ye College of Chemistry and Molecular Engineering Zhengzhou University

Recently, efforts have been made to develop graphene-metal oxide nanocomposites with different morphologies in developing electrochemical sensors. As electrochemial sensor modified material, CeO nanoparticles and graphene have some advantages. However, CeO nanoparticles often aggregate and graphene tends to agglomerate irreversibly. To solve this problem, a new and effective method was proposed in this approach: graphene functionalized with PDDA to disperse and immobilize CeO nanoparticles(CeO-PDDA-GR). The images of transmission electron microscopy(TEM) showed that well-shaped CeO nanoparticles distributed more uniformly on the GR sheets. Based on the CeO-PDDA-GR composites modified glassy carbon electrode, the electrochemical properties of eriocitrin were investigated in detail and a sensitive determination method was established synchronously. Differential pulse voltammetry(DPV) measurement revealed that the oxidation peak current increased linearly with eriocitrin concentrations in range of 1.0×10 mol L-1.0×10 mol L with detection limit of 3×10 mol L(S/N=3). Moreover, the proposed method was used in determination of eriocitrin in lemon sample with results of accurate and applicable.

关键词： Cerium oxide nanoparticles Graphene Poly(diallyldimethylammonium chloride) Electrochemical sensor Eriocitrin

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A simple and sensitive method for determination of taxifolin based on palladium nanoparticles supported on poly(diallyldimethylammonium chloride) functionalized graphene modified glassy carbon electrode

A simple and sensitive method for determination of taxifolin...

引用

河南省化学会2016年学术年会

作者： Qinqin Wang Lu Wang Gaiping Li baoxian ye College of Chemistry and Molecular Engineering Zhengzhou University Department of Environmental Engineering and Chemistry Luoyang Institute of Science and Technology

Palladium nanoparticles with diameter of around 5-10 nm supported on poly(diallyldimethylammonium chloride)(PDDA)- functionalized graphene were prepared by a simple chemical method. As-prepared nanocomposites were characterized by transmission electron microscopy(TEM), x-ray diffraction(XRD), ultraviolet-visible spectrophotometry(UV-vis), which were clearly demonstrated the successful attachment of PDDA and palladium nanoparticles to the graphene sheets,the nanocomposites exhibited excellent electrocatalytic activity and fast electron transfer rate toward taxifolin. Under the optimal conditions, square wave voltammetry(SWV) was applied for the determination of taxifolin, a good linear relationship of peak currents and the concentrations of taxifolin in the range of 4 × 10 1.0 × 10 mol L, a limit of detection of 1 × 10 mol L(S/N = 3). The proposed method was successfully applied to the determination of taxifolin in fructus polygoni orientalis with well results.

关键词： taxifolin poly(diallyldimethylammonium chloride)-functionalized grapheme palladium nanoparticles square wave voltammetry

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Highly-sensitive Voltammetric Sensor for Scutellarin Based On Poly-taurine Film Modified Electrode

A Highly-sensitive Voltammetric Sensor for Scutellarin Based...

引用

河南省化学会2016年学术年会

作者： Yinfeng Li Wei Liu Lingzhi Du Haipeng Zhao baoxian ye School of Chemical and Material Engineering Henan University of Urban Construction College of Chemistry and Molecular Engineering Zhengzhou University

A highly-sensitive voltammetric sensor for scutellarin was fabricated via directly electro-polymerization of taurine at glassy carbon electrode. This sensor was simply obtained but displayed greatly improved response for scutellarin. The redox process of scutellarin was investigated systematically and some dynamic parameters of electrode reaction were calculated using electrochemical techniques in details. Under the optimum conditions, the linear range was from 8.0×10 to 4.0×10 mol L with a low detectable limit 8.0×10 mol L. The proposed method was used to determine scutellarin in commercial pharmaceuticals with satisfactory results.

关键词： scutellarin electropolymerization poly-taurine voltammetric sensor

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Electrochemical behavior of Jateorhizine at L-aspartic acid modified glassy carbon electrode and analytical application

Electrochemical behavior of Jateorhizine at L-aspartic acid ...

引用

河南省化学会2016年学术年会

作者： Zihong Pan Yinfeng Li Xia Li Haipeng Zhao baoxian ye College of Chemistry and Environmental Engineering Pingdingshan University College of Chemistry and Molecular Engineering Zhengzhou University School of Chemical and Material Engineering Henan University of Urban Construction

A simple but highly sensitive voltammetric method for the determination of Jateorhizine was developed using a poly(L-aspartic acid) modified electrode. The redox character of Jateorhizine was investigated systematically in details. Using electrochemical techniques, some dynamic parameters of electrode reaction were calculated and a reasonable reaction mechanism of Jateorhizine on L-aspartic modified electrode was also dicussed and proposed, which could be a reference for the pharmacological action of Jateorhizine in clinical study. Under optimum conditions, the linear range was from 2.0×10 to 4.0×10 mol L with a low detectable limit 2.0×10 mol L. Therefore, the high sensitivity for Jateorhizine analysis at the proposed electrode was realized, and the proposed method could also be used to detect Jateorhizine in the Chinese medicinal herb Tinospora capillipes Gagnep with satisfactory results.

关键词： Jateorhizine poly(L-aspartic acid) voltammetric sensor liner sweep voltammetry

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Highly sensitive determination of esculetin on TiO2-NPs-coated poly(diallyldimethylammonium chloride)-functionalized graphene modified electrode

Highly sensitive determination of esculetin on TiO2-NPs-coat...

引用

河南省化学会2016年学术年会

作者： Huichao Li Lu Wang Kai Sheng Lina Zou baoxian ye College of Chemistry and Molecular Engineering Zhengzhou University

Well dispersed titanium dioxide nanoparticles on poly(diallyldimethylammonium chloride)-functionalized graphene(TiO-PDDA-Gr) nanocomposites have been successfully synthesized via a facile and green strategy. The prepared nanocomposites were characterized by X-ray diffraction(XRD), UV-visible spectrophotometry(UV-vis), Fourier Transform infrared spectroscopy(FT-IR) and transmission electron microscopy(TEM). Due to the excellent conductivity and strong adsorption ability of the composites toward esculetin, it have been proved to be an excellent probe for electrochemical sensing. Under the optimized conditions, a lower detection limit of 4×10 mol L(S/N=3) and a wide linear detection range from 1×10 to 3.5×10 mol L were achieved by differential pulse voltammetry(DPV). Additionally, this simple, sensitive sensor was proved to be suitable for the determination of esculetin in Chinese herb Viola yedoensis Makino and Cortex Fraxini with satisfactory results.

关键词： esculetin graphene TiO2 NPs poly(diallyldimethylammonium chloride) voltammetric sensor

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Study of the Voltammetric Behavior of Heme and Its Direct Analysis Application

引用

Wuhan University Journal of Natural Sciences 1998年第4期3卷 473-475页

作者： Liu Huihong ye baoxian Zhou Xingyao(College of Chemistry, Wuhan University, Wuhan 430072, China)

The electroanalytical method of ferriheme was studied by linear sweep voltammetry in medium of 0.05 mol/L Tris+0.05 mol/L NH3?NH4Cl buffer at hang mercury drop electrodes (HMDE). Heme exhibits two pair reversible redox peaks and one irreversible peak. The cathodic peak potentials are?;0.236 V, ?0.422 V and ?1.408 V respectively. The first and the third peaks can be used for directly quantitative determination of heme concentrations. The peak currents are good linear relationship with heme concentration in ranges of 3×10?6–6×10?5 mol/L and 3×10?7–1.5×10?5 mol/L respectively.

关键词： heme voltammetric behavior catalytic wave

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A new voltammetric sensor for sensitive detection of gallic acid based on Pt nanoparticles-decorated polyelectrolyte-functionalized graphene nanocomposite film

A new voltammetric sensor for sensitive detection of gallic ...

引用

河南省化学会2016年学术年会

作者： Yudong Gao Lu Wang Yulong Zhang Gaiping Li Lina Zou baoxian ye College of Chemistry and Molecular Engineering Zhengzhou University

A new voltammetric sensor for gallic acid was fabricated by using the poly(diallyldimethylammonium chloride)(PDDA)-functionalized graphene supported platinum nanoparticles nanocomposite(PDDA-GR-Pt) modified glassy carbon electrode. The nanocomposites were characterized using UV-vis spectrum, transmission electron microscope(TEM) and X-ray diffraction(XRD), respectively. This voltammetric sensor exhibited excellent electrochemical response for gallic acid. The electrode process of gallic acid was investigated in detail and some dynamics parameters were calculated. Under optimum conditions by square wave voltammetry(SWV), a good linear relationship was obtained between peak currents and gallic acid concentrations in the wider range of 3×10-1×10 mol L with lower detection limit of 7×10 mol L(S/N=3). In addition, the proposed voltammetric method was successfully applied to test gallic acid in real samples with well results.

关键词： gallic acid Pt nanoparticle graphene voltammetric sensor

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

新型醚键连接的杂环功能基杯[4]芳烃衍生物的合成及结构

引用

有机化学 2010年第8期30卷 1212-1219页

作者：赵邦屯王成斌吴圣江冶保献洛阳师范学院化学系洛阳471022 郑州大学化学系郑州450001

以碘化钠为催化剂,在氢氧化钠存在下2-氯乙氧基乙醇分别与2-巯基芳香杂环化合物反应制得相应的芳香杂环衍生物1a～1e.以三乙胺为缚酸剂,其与对甲苯磺酰氯反应,生成了活化羟基的衍生物2a～2e.在碳酸钾存在下,对叔丁基杯[4]芳烃分别与2a... 详细信息

以碘化钠为催化剂,在氢氧化钠存在下2-氯乙氧基乙醇分别与2-巯基芳香杂环化合物反应制得相应的芳香杂环衍生物1a～1e.以三乙胺为缚酸剂,其与对甲苯磺酰氯反应,生成了活化羟基的衍生物2a～2e.在碳酸钾存在下,对叔丁基杯[4]芳烃分别与2a～2e反应生成醚键连接的杂环功能基杯[4]芳烃衍生物3a～3e,并通过1HNMR,13CNMR,IR,MS和元素分析的确证.同时,X射线分析确定了杯[4]芳烃3a,3b和3d的晶体结构.

关键词：杯芳烃 2-巯基芳香杂环化合物合成晶体结构

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：