Chinese Journal of Analytical Chemistry This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

Direct Determination of Ascorbic Acid in Fruits and Vegetables by Positive Scan Polarization Reverse Catalytic Voltammetry
Publication date: August 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 8Author(s): Pan PAN, Shou-Guo WUAbstractThe positive scan polarization reverse catalytic voltammetry was used for direct detection of ascorbic acid in fruit and vegetable samples. An ascorbic acid sensor was fabricated based on CuxO nanoparticles protected by the graphene oxide (GO) layer. The common copper electrode was first electrooxidized in strong alkaline solution to generate CuxO nanoparticles on the electrode surface, then GO was electrodeposited to form a protective layer covered on the surface of CuxO nanoparticles. The...
Source: Chinese Journal of Analytical Chemistry - August 21, 2019 Category: Chemistry Source Type: research

A Novel Genistein Electrochemical Sensor Based on Molecularly Imprinted Polycarbazole/Carboxylated Multiwalled Carbon Nanotubes Nanocomposite
Publication date: August 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 8Author(s): Li-Ting NIU, Gen-Gen LI, Hai-Feng LI, Fan CUI, Jing ZHANG, Ying HUANG, Kai CHEN, Jian-Fu ZHANG, Wen-Fei LI, Wei-Lu LIUAbstractGenistein is an important isoflavone that has been widely used to prevent blood disease and cancer. In this work, a novel genistein electrochemical sensor was developed based on the composite of molecularly imprinted polymer (MIP) and carboxylated multiwalled carbon nanotubes (cMWCNTs). The MIP layer was electropolymerizated on the cMWCNTs modified electrode using carbazole as functional monome...
Source: Chinese Journal of Analytical Chemistry - August 21, 2019 Category: Chemistry Source Type: research

Facile Fabrication of Gold Functionalized Nanopipette for Nanoscale Electrochemistry and Surface Enhanced Raman Spectroscopy
Publication date: August 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 8Author(s): Hong-Na LI, Dan YANG, Ao-Xue LIU, Guo-Hui LIU, Yu-Ping SHAN, Guo-Cheng YANG, Jin HEAbstractNanopipette has emerged as a versatile nanosensor. It is desirable to expand the sensing capabilities of nanopipette by integrating multiple sensing methods into one nanopipette. In this work, we presented a seeded growth approach to facilely, cheaply and quickly deposit a gold layer with controllable length at the inner surface of the nanopipette tip. The deposited gold formed a wireless ring-shape gold nanoelectrode at the nan...
Source: Chinese Journal of Analytical Chemistry - August 21, 2019 Category: Chemistry Source Type: research

Progress of Microfluidics Based on Printed Circuit Board and its Applications
Publication date: July 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 7Author(s): Yong-Jia CHANG, Hui YOUAbstractCommercialization is the current major theme of microfluidics. Since lab-on-printed circuit board (lab-on-PCB) can integrate PCB technology and polymer microfluidic manufacturing process, a low-cost, standardized and mass productive platform has been formed to promote commercialization efficiently. In this paper, we summarized the research of lab-on-PCB in the past 20 years and reviewed the progresses from structures, materials and fabrication methods according to the analysis of typical l...
Source: Chinese Journal of Analytical Chemistry - July 10, 2019 Category: Chemistry Source Type: research

Application of Vacuum Ultraviolet Single-photon Ionization Mass Spectrometer in Online Analysis of Volatile Organic Compounds
Publication date: July 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 7Author(s): Wan-Qi SUN, Yong ZHANG, Shuang-Xi FANGAbstractA vacuum ultraviolet single-photon ionization mass spectrometer, which has the merits of broad-spectrum soft ionization, low fragment peak, low matrix influence, high sensitivity and short response time, is fit for use in the online analysis of mixed volatile organic compounds. In this review, the theory and structural composition of the single-photon ionization mass spectrometer are described, and the current research progress of sampling systems, ionization sources, and ma...
Source: Chinese Journal of Analytical Chemistry - July 10, 2019 Category: Chemistry Source Type: research

Preparation of Aptamer-functionalized Au@pNTP@SiO2 Core-Shell Surface-enhanced Raman Scattering Probes for Raman Imaging Study of Adhesive Tape Transferred-Latent Fingerprints
Publication date: July 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 7Author(s): Yang-Yang ZHOU, Yu-Mei DU, Xiao-Jun BIAN, Juan YANAbstractThe core-shell SERS nanoprobe combined with adhesive tape was used to recognize the latent fingerprints on the surface of the object, which provides an effective solution for the imaging of latent fingerprints on the surface of large immobile or curved objects. First, the Au@pNTP@SiO2 SERS probes modified by aptamers specific to lysozyme were prepared, and characterized by TEM/EDS, and its SERS effects were also tested. Then the probe was incubated with the aged-...
Source: Chinese Journal of Analytical Chemistry - July 10, 2019 Category: Chemistry Source Type: research

Rapid Separation and Precise Determination of Strontium Isotopic from Geological Samples with High Rubidium/Strontium Ratios
In this study, the conventional two-stage separation process was optimized, and an experimental method for rapid separation of Sr from geological samples with high Rb/Sr ratios was established. In this method, the Sr solution after purified by AG50 resin was directly added to a new AG50 resin to purify Rb and Sr again. The whole separation process would be accomplished quickly and efficiently. The method combined with highly sensitive thermal ionization mass spectrometer (TIMS) technique was completely satisfied in high precision determination of 87Sr/86Sr isotope ratio in the samples with high Rb/Sr ratios. Through the ap...
Source: Chinese Journal of Analytical Chemistry - July 10, 2019 Category: Chemistry Source Type: research

An Electronic Nose Based on Copper Oxide Heterojunctions for Rapid Assessment of Liquor
Publication date: July 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 7Author(s): Kang LIANG, Yu WANG, Jia-Qi HE, Hu MENG, Shu-Qin CHEN, Jun-Yu CHANG, Jian-Mei GAO, Ji-Hui WANG, Liang FENGAbstractThe novel methods for rapid detection and discrimination of aroma have gained huge attentions not only because of the growing demands for food safety supervision, but also due to their high potentials in monitoring and regulating fermentation process in food production. In this work, a prototype of electronic nose was developed by eight metal oxide semiconductor gas sensors which were fabricated based on two...
Source: Chinese Journal of Analytical Chemistry - July 10, 2019 Category: Chemistry Source Type: research

Modulating Nanoparticle Translocation by Surface Chemistry of Gold Nanopores
Publication date: July 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 7Author(s): Ao-Xue LIU, Dan YANG, Hong-Na LI, Guo-Hui LIU, Qiang FU, Yu-Ping SHAN, Guo-Cheng YANG, Jin HEAbstractA simple and effective method for modulating nanoparticles (NPs) translocation through nanopore by tuning the surface change of chemically modified gold coated nanopore was developed. The gold-coated pore is simply prepared from a nanopipette and the partially insulated gold coating can be utilized to effectively concentrate NPs near the nanopore entrance. The surface modification of gold near the orifice effectively mod...
Source: Chinese Journal of Analytical Chemistry - July 10, 2019 Category: Chemistry Source Type: research

Advances in Microdroplet Generation Methods
Publication date: June 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 6Author(s): Yu-Yao WEI, Zi-Qiao SUN, Hao-Hui REN, Lei LIAbstractMicrodroplets have been widely used in biology, chemistry, material science and engineering, and the microdroplet generation methods are becoming more efficient and controllable. The development of the generation of microdroplets experienced tradition methods, microfluidic chip-based methods, and off-chip methods proposed recently. In this review, we first briefly summarized the typical traditional methods and the microfluidic chip-based methods for microdroplet genera...
Source: Chinese Journal of Analytical Chemistry - June 12, 2019 Category: Chemistry Source Type: research

Research and Application Progress of Micellar Electrokinetic Chromatography in Separation of Proteins
Publication date: June 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 6Author(s): Fan GAO, Xiao-Fei WANG, Bo ZHANGAbstractMicellar electrokinetic chromatography (MEKC) is a hybrid of chromatography and electrophoresis. The separation mechanism is based on the interaction of analytes and pseudo-stationary phase and also the differential mobility in the electric field. Such property of MEKC can be made good use for separation of proteins and peptides, which have high dimensionality. In the past years, either in the form of single dimensional or multi-dimensional separations, MEKC has demonstrated its e...
Source: Chinese Journal of Analytical Chemistry - June 12, 2019 Category: Chemistry Source Type: research

High Performance Micro Gas Chromatography Column Using Mesoporous Silica as Stationary Phase
Publication date: June 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 6Author(s): Xue-Lei YANG, Bin ZHAO, Fei FENG, Hai-Mei ZHOU, Heng YANG, Xin-Xin LIAbstractA semi-packed micro gas chromatography (μGC) column embedded micro-elliptical pillars was fabricated based on micro- electro-mechanical system (MEMS) technique. The mesoporous silica (MS) film with 2-nm pore size and large specific surface area was coated on the inner surface of the μGC column as stationary phase. A baseline separation of alkanes (C5–C10) was realized by the μGC column which used MS as stationary phase, and the resolution ...
Source: Chinese Journal of Analytical Chemistry - June 12, 2019 Category: Chemistry Source Type: research

Determination of Ten Kinds of Monohydroxylated Polycyclic Aromatic Hydrocarbons in Human Urine by Supported Liquid Extraction Followed by Liquid Chromatography-Tandem Mass Spectrometry
Publication date: June 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 6Author(s): Ting SHANG, Ling-Juan ZHAO, Pei LI, Xiang-Ying ZENG, Zhi-Qiang YUAbstractThe monitoring of urinary monohydroxylated polycyclic aromatic hydrocarbons (OH-PAHs) can be used for risk assessment of human exposure to polycyclic aromatic hydrocarbons (PAHs). In this work, we developed a novel pretreatment method based on supported liquid extraction (SLE) for determination of 10 kinds of OH-PAHs by liquid chromatography- tandem mass spectrometry (LC-MS/MS). Urine samples were extracted with a mixed solvent of dichloromethane/n...
Source: Chinese Journal of Analytical Chemistry - June 12, 2019 Category: Chemistry Source Type: research

Determination of Stable Nitrogen and Oxygen Isotope Ratios in Atmospheric Aerosol Nitrates
This study provided a novel method for better understanding emission sources and transformation pathways of atmospheric nitrate.Graphical AbstractSeveral conditions of two-step chemical reduction method for simultaneously determination of nitrogen and oxygen isotope(d15N and d18O)of atmospheric nitrate particles, were optimized. An optimal scheme for accurately determining the d15N and d18O of the NO3- of the aerosol was developed. (Source: Chinese Journal of Analytical Chemistry)
Source: Chinese Journal of Analytical Chemistry - June 12, 2019 Category: Chemistry Source Type: research

Sensitive Fluorescent Assay for Determination of Cu2+ in Aqueous Solution Using Isorhamnetin-β-cyclodextrin Inclusion
Publication date: June 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 6Author(s): Shi-Long YANG, Wei-Na JIANG, Ying TANG, Li XU, Bu-Hong GAO, Hai-Jun XUAbstractA fluorescent probe based on isorhamnetin (Iso)-cyclodextrin (CD) inclusion for detecting Cu2+ was synthesized. A major fluorescence emission peak at 542 nm was observed for isorhamnetin (Iso) in buffer solution (pH 7.40) when the excitation wavelength was 390 nm. It was surprisingly found that (2-hydroxypropyl)-β-cyclodextrin (β-CD) could enhance the fluorescence intensity of Iso, and the major fluorescence peak was shifted to 557 nm. UV-vi...
Source: Chinese Journal of Analytical Chemistry - June 12, 2019 Category: Chemistry Source Type: research