Search results for: Gongke Li

Items from 1 to 20 out of 118 results

article

A “Polymer Template” Strategy for Carbonized Polymer Dots with Controllable Properties

Zhiming Huo, Ling Xia, Gongke Li, Xiaohua Xiao

Chemistry – A European Journal > 26 > 64 > 14754 - 14764

Limited avenues are available for property control of carbonized polymer dots (PDs) owing to the unsatisfactory understanding of PDs“ formation. Herein, a de novo ”polymer template“ strategy is presented for PDs with customizable functional surface groups (FSG), size, and underlying fluorescence, with a detailed mechanism. The strategy relies on novel di‐active site polymers (DASPs) prepared from...

article

Thin‐layer chromatography combined with surface‐enhanced Raman scattering for rapid detection of benzidine and 4‐aminobiphenyl in migration from food contact materials based on gold nanoparticle doped metal‐organic framework

Guohui Cai, Kun Ge, Xiaoyan Ouyang, Yuling Hu, more

Journal of Separation Science > 43 > 14 > 2834 - 2841

In this work, a rapid and sensitive thin‐layer chromatography combined with surface‐enhanced Raman spectroscopy method was established for rapid detection of benzidine and 4‐aminobiphenyl in migration from food contact materials based on Au nanoparticle doped metal‐organic framework. Benzidine and 4‐aminobiphenyl were firstly separated by thin‐layer chromatography to solve the limitation of their...

article

Rapid and accurate determination of trace volatile sulfur compounds in human halitosis by an adaptable active sampling system coupling with gas chromatography

Yu Xu, Zhongning Yu, Xiaobin Chen, Yi Zhou, more

Journal of Separation Science > 43 > 9-10 > 1830 - 1837

Halitosis with the main components of trace volatile sulfur compounds widely affects the quality of life. In this study, an adaptable active sampling system with two sample‐collection modes of direct injection and solid‐phase microextraction was developed for the rapid and precise determination of trace volatile sulfur compounds in human halitosis coupled with gas chromatography–flame photometric...

article

Recent advances in sample preparation techniques in China

Ling Xia, Yanxia Li, Yulan Liu, Gongke Li, more

Journal of Separation Science > 43 > 1 > 189 - 201

Sample preparation is the procedure before instrumental analysis and significant to its effectiveness and efficiency. However, this procedure is usually time‐consuming, labor intensive, and prone to error. In the last decade, the development of sample preparation techniques has received increasing attention, especially in complex sample application. To pretreat samples faster and more effectively,...

article

Front Cover: Recent advances in sample preparation techniques in China

Ling Xia, Yanxia Li, Yulan Liu, Gongke Li, more

Journal of Separation Science > 43 > 1 > NA - NA

DOI: 10.1002/jssc.201900768 The cover picture shows the most important for approaches of sample preparation techniques. They are phase separation techniques, field‐assisted extraction techniques, membrane separation techniques, and chemical conversion techniques. Sample preparation is a critical step in complex sample analysis which effect to sensitivity, selectivity, speed, and accuracy of analytical...

article

Rapid determination of trace nitrofurantoin in cosmetics by surface enhanced Raman spectroscopy using nanoarrayed hydroxyl polystyrene‐based substrate

Yi Zhang, Zhongning Yu, Zhenfeng Yue, Jiamin Gao, more

Journal of Raman Spectroscopy > 50 > 8 > 1094 - 1102

The safety of cosmetics attributing to the illegal addition of antibiotics for quick effect is a big concern nowadays. Nitrofurans, one of commonly added illegal antibiotics, are strictly banned in cosmetics in China. It is still a great challenge for the rapid and precise analysis of trace nitrofurans when facing various cosmetics with complicated matrices. Surface‐enhanced Raman spectroscopy (SERS)...

article

A microchip device to enhance free flow electrophoresis using controllable pinched sample injections

Wanjun Zhou, Ling Xia, Xiaohua Xiao, Gongke Li, more

ELECTROPHORESIS > 40 > 16-17 > 2165 - 2171

Micro free flow electrophoresis (µFFE) is a valuable technique capable of high throughput rapid microscale electrophoretic separation along with mild operating conditions. However, the stream flow separation nature of free flow electrophoresis affects its separation performance with additional stream broadening due to sample stream deflection. To reduce stream broadening and enhance separation performance...

article

A composite prepared from gold nanoparticles and a metal organic framework (type MOF-74) for determination of 4-nitrothiophenol by surface-enhanced Raman spectroscopy

Yanshu Zhang, Yufei Hu, Gongke Li, Runkun Zhang

Microchimica Acta > 2019 > 186 > 7 > 1-10

Core-shell nanoparticles (NPs) consisting of a gold core and a metal-organic framework shell (type MOF-74) were synthesized via one-pot synthesis. The NPs exhibit highly sensitive and stable SERS activity for the detection of 4-nitrothiophenol, with a specific band at 1337 cm⁻¹. The method has a linear response in 0.10–10 μmol·L⁻¹ analyte concentration range and a lower detection limit of 69 nmol·L...

article

An online field-assisted micro-solid-phase extraction device coupled with high-performance liquid chromatography for the direct analysis of solid samples

Ling Xia, Yuanyuan He, Xiaohua Xiao, Gongke Li

Analytical and Bioanalytical Chemistry > 2019 > 411 > 18 > 4073-4084

Herein, a total online device based on field-assisted extraction (FAE), micro-solid-phase extraction (μ-SPE), and high-performance liquid chromatography (HPLC) was designed. Solid samples were pretreated with ultrasound-microwave synergic effects, and then the extract was cleaned up online with a monolithic column, followed by HPLC analysis. The cross-actions between ultrasound and microwave along...

article

A hybrid triazine‐imine core‐shell magnetic covalent organic polymer for analysis of pesticides in fruit samples by ultra high performance liquid chromatography with tandem mass spectrometry

Ruiyu Liang, Yi Peng, Yuling Hu, Gongke Li

Journal of Separation Science > 42 > 7 > 1432 - 1439

A novel hybrid triazine‐imine core‐shell magnetic covalent organic polymer with high adsorption capacity and excellent stability was fabricated by surface‐assisted in situ growth technique. The composite possesses porous and extended π‐conjugated system, and was applied as the magnetic sorbent for efficient enrichment and rapid separation of pesticides. A new analytical method for simultaneous determination...

article

A covalently cross‐linked microporous polymer based micro‐solid phase extraction for online analysis of trace pesticide residues in citrus fruits

Tianfu Wei, Gongke Li, Zhuomin Zhang

Journal of Separation Science > 42 > 4 > 888 - 896

Covalently cross‐linked microporous polymers are a new class of highly cross‐linked porous network materials with large surface area and potential superiority in sample pretreatment. In this work, a covalently cross‐linked microporous polymer was well designed and synthesized by condensation of acylhydrazines in terephthalic dihydrazide with aldehyde groups in 1,3,5‐benzenetricarboxaldehyde. The adsorption...

article

Raman spectroscopic imaging of pH values in cancerous tissue by using polyaniline@gold nanoparticles

Zicheng Li, Ling Xia, Gongke Li, Yuling Hu

Microchimica Acta > 2019 > 186 > 3 > 1-8

A core-shell nanocomposite consisting of polyaniline and gold nanoparticles (PANI@AuNPs) is shown to enable intracellular monitoring of pH values by surface-enhanced Raman scattering (SERS) spectroscopy. The method exploits the pH-responsive property of PANI and the SERS-enhancing effect of AuNPs. The intensity of the PANI Raman peak at 1164 cm⁻¹ decreases on increasing the pH value from 4.6 to 7...

article

Ozone-induction coupled with plasma assistance to enhance cataluminescence for monitoring of volatile organic compounds

Wanting Huang, Yufei Hu, Zhenyu Lu, Yanhui Zhong, more

Microchimica Acta > 2018 > 185 > 12 > 1-9

The authors describe a strategy for ozone-induction coupling with plasma assistance (O₃-I/PA) to enhance cataluminescence (CTL) based sensing of volatile organic compounds (VOCs). A homemade O₃-I/PA CTL sensor system was constructed based on this strategy. O₃-I/PA can significantly enhance the CTL response to many compounds that were hardly detectable previously with adequate sensitivity. Without...

article

Simultaneous Determination of Antioxidants in Edible Oils Using Graphene Oxide/β‐Cyclodextrin‐modified Electrochemical Sensor

Zhaoxia Shi, Jie Tan, Yufei Hu, Gongke Li, more

Electroanalysis > 30 > 10 > 2467 - 2474

In this work, graphene oxide/β‐cyclodextrin (GO/β‐CD) composite was synthesised and applied to construct a highly sensitive electrochemical sensor for the determination of propyl gallate (PG) and butyl hydroxy anisole (BHA) in edible oil, simultaneously. Various methods were used to characterize the properties of GO/β‐cyclodextrin composite. Furthermore, the oxidation peak currents of PG and BHA were...

article

Magnetic‐covalent organic polymer solid‐phase extraction coupled with high‐performance liquid chromatography for the sensitive determination of fluorescent whitening agents in cosmetics

Ling Xia, Xiaoman Chen, Xiaohua Xiao, Gongke Li

Journal of Separation Science > 41 > 19 > 3733 - 3741

Magnetic solid‐phase extraction is a powerful sample preparation tool. Combined with covalent organic polymers, this technique permits an excellent extraction performance. We present a sensitive, efficient, and easy operating magnetic‐ covalent organic polymer solid‐phase extraction method. By using the magnetic covalent organic polymer nanoparticles yielded by a one‐pot reaction, five fluorescent...

article

A novel electrochemical sensor based on Fe3O4-doped nanoporous carbon for simultaneous determination of diethylstilbestrol and 17β-estradiol in toner

Xiaoman Chen, Zhaoxia Shi, Yufei Hu, Xiaohua Xiao, more

Talanta > 2018 > 188 > C > 81-90

In this paper, Fe₃O₄-doped nanoporous carbon (Fe₃O₄-NC) was synthesized through the carbonization of Fe-porous coordination polymer (Fe-PCP), which are also known as metal-organic framework (MOF), and fabricated into an electrochemical sensor for simultaneous analysis of diethylstilbestrol (DES) and 17β-estradiol (E2) in toner. Fe₃O₄-NC was characterized by scanning electron microscope (SEM), powder...

article

Synthesis of Au@Ag core-shell nanostructures with a poly(3,4-dihydroxy-L-phenylalanine) interlayer for surface-enhanced Raman scattering imaging of epithelial cells

Haibin Wen, Peichun Jiang, Yuling Hu, Gongke Li

Microchimica Acta > 2018 > 185 > 7 > 1-8

Poly(3,4-dihydroxy-L-phenylalanine) (polyDOPA) is a stable and biocompatible reducing agent. A versatile strategy is described here for the synthesis of core-shell Au@Ag nanostructures containing a polyDOPA interlayer. The latter provides abundant sites for deposition of nanocomposites, to immobilize molecules and to grow shells. The Au@polyDOPA@Ag nanoparticles are shown to generate strong and stable...

article

A simple one-step ultrasonic-assisted extraction and derivatization method coupling to high-performance liquid chromatographyfor the determination of ε-aminocaproic acid and amino acids in cosmetics

Yuanqi Du, Ling Xia, Xiaohua Xiao, Gongke Li, more

Journal of Chromatography A > 2018 > 1554 > C > 37-44

Nowadays, the safety of cosmetics is a widespread concern. Amines are common cosmetic additives. Some of them such as amino acids are beneficial. Another kind of amines, however, ε-aminocaproic acid (EACA) is prohibited to add into cosmetics for its adverse reactions. In this study, a simple, rapid, sensitive and eco-friendly one-step ultrasonic-assisted extraction and derivatization (UAE-D) method...

article

Solid‐phase extraction based on amino‐functionalized graphene oxide nanocomposites for analysis of short‐chain perfluorinated alkyl acids in human serum by ion chromatography mass spectrometry

Zhixiong Zhong, Gongke Li, Lingchuan Guo, Jing Yao, more

Biomedical Chromatography > 32 > 7 > n/a - n/a

A highly sensitive method was developed for the analysis of short‐chain perfluorinated alkyl acids (PFAAs) in serum samples using solid‐phase extraction (SPE) coupled with ion chromatography–electrospray ionization–mass spectrometry. The synthesized amino‐functionalized graphene oxide nanocomposites were used as an SPE sorbent for the enrichment of trace analytes and purification of samples. They...

article

Nitrogen dots as reductant and stabilizer for the synthesis of AgNPs/N-dots nanocomposites for efficient surface-enhanced Raman scattering detection

Zhenhua Lin, Jiani Yang, Zhijiao Tang, Gongke Li, more

Talanta > 2018 > 178 > C > 515-521

A simple method was developed for the preparation of silver nanoparticles (AgNPs) by using amino-functionalized nitrogen dots (N-dots) as reductant and stabilizer under mild conditions. N-dots were hydrothermal synthesized using 2-azidoimidazole as the precursor in aqueous ammonia. The as prepared N-dots were rich in nitrogen and oxygen-containing functional groups and exhibit strong reducing capacity...

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FLUORESCENT WHITENING AGENTS (2)
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K5[CU(HIO6)2] (2)
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INFONA - science communication portal

Search results for: Gongke Li

A “Polymer Template” Strategy for Carbonized Polymer Dots with Controllable Properties

Thin‐layer chromatography combined with surface‐enhanced Raman scattering for rapid detection of benzidine and 4‐aminobiphenyl in migration from food contact materials based on gold nanoparticle doped metal‐organic framework

Rapid and accurate determination of trace volatile sulfur compounds in human halitosis by an adaptable active sampling system coupling with gas chromatography

Recent advances in sample preparation techniques in China

Front Cover: Recent advances in sample preparation techniques in China

Rapid determination of trace nitrofurantoin in cosmetics by surface enhanced Raman spectroscopy using nanoarrayed hydroxyl polystyrene‐based substrate

A microchip device to enhance free flow electrophoresis using controllable pinched sample injections

A composite prepared from gold nanoparticles and a metal organic framework (type MOF-74) for determination of 4-nitrothiophenol by surface-enhanced Raman spectroscopy

An online field-assisted micro-solid-phase extraction device coupled with high-performance liquid chromatography for the direct analysis of solid samples

A hybrid triazine‐imine core‐shell magnetic covalent organic polymer for analysis of pesticides in fruit samples by ultra high performance liquid chromatography with tandem mass spectrometry

A covalently cross‐linked microporous polymer based micro‐solid phase extraction for online analysis of trace pesticide residues in citrus fruits

Raman spectroscopic imaging of pH values in cancerous tissue by using polyaniline@gold nanoparticles

Ozone-induction coupled with plasma assistance to enhance cataluminescence for monitoring of volatile organic compounds

Simultaneous Determination of Antioxidants in Edible Oils Using Graphene Oxide/β‐Cyclodextrin‐modified Electrochemical Sensor

Magnetic‐covalent organic polymer solid‐phase extraction coupled with high‐performance liquid chromatography for the sensitive determination of fluorescent whitening agents in cosmetics

A novel electrochemical sensor based on Fe3O4-doped nanoporous carbon for simultaneous determination of diethylstilbestrol and 17β-estradiol in toner

Synthesis of Au@Ag core-shell nanostructures with a poly(3,4-dihydroxy-L-phenylalanine) interlayer for surface-enhanced Raman scattering imaging of epithelial cells

A simple one-step ultrasonic-assisted extraction and derivatization method coupling to high-performance liquid chromatographyfor the determination of ε-aminocaproic acid and amino acids in cosmetics

Solid‐phase extraction based on amino‐functionalized graphene oxide nanocomposites for analysis of short‐chain perfluorinated alkyl acids in human serum by ion chromatography mass spectrometry

Nitrogen dots as reductant and stabilizer for the synthesis of AgNPs/N-dots nanocomposites for efficient surface-enhanced Raman scattering detection

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