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Neeraj Kumar, Rosy, Rajendra N Goyal
A sensitive and facile molecular imprinted sensor has been fabricated using edge plane pyrolytic graphite (EPPG) for the determination of an important oxidative DNA damage product, 8-hydroxydeoxyguanosine (8-OHdG). The molecularly imprinted polymer film was fabricated by electropolymerization of melamine in the presence of 8-OHdG, on glutaraldehyde/poly 1,5-diaminonaphthalene modified EPPG. The imprinted sensor surface was characterized by using Field Emission Scanning Electron Microscopy, Electron Impedance Spectroscopy, Cyclic Voltammetry, Square Wave Voltammetry and UV-visible spectroscopy...
May 1, 2017: Talanta
Raphael Henn, Christian G Kirchler, Maria-Elisabeth Grossgut, Christian W Huck
This study compared three commercially available spectrometers - whereas two of them were miniaturized - in terms of prediction ability of melamine in milk powder (infant formula). Therefore all spectra were split into calibration- and validation-set using Kennard Stone and Duplex algorithm in comparison. For each instrument the three best performing PLSR models were constructed using SNV and Savitzky Golay derivatives. The best RMSEP values were 0.28g/100g, 0.33g/100g and 0.27g/100g for the NIRFlex N-500, the microPHAZIR and the microNIR2200 respectively...
May 1, 2017: Talanta
Lei An, Wei Sun
No abstract text is available yet for this article.
February 16, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
Xiaolei Zhang, Xiangheng Xiao, Zhigao Dai, Wei Wu, Xingang Zhang, Lei Fu, Changzhong Jiang
Low-cost, stabilized and ultrasensitive three-dimensional (3D) hierarchical surface-enhanced Raman scattering substrates ("sunflower-like" nanoarrays decorated with Ag nanoparticles, denoted as SLNAs-Ag) have been obtained by fabricating binary colloidal crystals and then decorating with Ag nanoparticles. In order to provide a larger density of hot spots within the laser-illumination area, the silica sphere arrays were chosen as the island-type platform for the polystyrene (PS) nanosphere deposition, and the distances between the PS nanospheres were tuned by etching for different durations...
February 16, 2017: Nanoscale
Bin Yang, Xuhui Mao, Liu Pi, Yixiao Wu, Huijun Ding, Weihao Zhang
In this study, g-C3N4 was synthesized by thermal polycondensation of melamine and was characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, UV-visible diffuse reflection spectroscopy, and scanning electron microscopy. Results showed that g-C3N4 degraded sulfadimidine (SMD) under visible light, in which the adsorption and photocatalytic degradation was influenced by pH. The maximum adsorption capacity was achieved at approximately pH 5. The highest degradation rate constant was obtained at strong acid and alkali...
February 15, 2017: Environmental Science and Pollution Research International
Menghua Li, Caina Jiao, Xiumin Yang, Chun Wang, Qiuhua Wu, Zhi Wang
A new kind of magnetic N-doped mesoporous carbon was facilely prepared by one-step carbonizing a hybrid precursor (glucose, melamine and iron chloride) in a N2 atmosphere with eutectic salt (KCl/ZnCl2 ) as the porogen. The obtained magnetic N-doped mesoporous carbon showed excellent characteristics, such as strong magnetic response, high surface area, large pore volume, and abundant π-electron system, which endow it with a great potential as a magnetic solid phase extraction adsorbent. To evaluate its adsorption performance, the magnetic N-doped mesoporous carbon was used for the extraction of three phthalate esters from soft drink samples followed by high performance liquid chromatographic analysis...
February 13, 2017: Journal of Separation Science
Suyana Panneri, Priyanka Ganguly, Balagopal N Nair, Abdul Azeez Peer Mohamed, Krishna Gopa Kumar Warrier, Unnikrishnan Nair Saraswathy Hareesh
In this paper, we provide a comprehensive evaluation of graphitic carbon nitride (C3N4) powders derived from the four different precursors melamine, cyanamide, thiourea, and urea for the photocatalytic degradation of tetracycline (TC) antibiotic under sunlight irradiation. The powders were synthesized by employing the conventional thermal decomposition method. The synthesized powders were examined using different characterization tools for evaluating the photophysical properties. The degradation profile revealed that urea-derived C3N4 showed the highest activity while melamine-derived C3N4 showed the least activity...
February 14, 2017: Environmental Science and Pollution Research International
Yiwei Tang, Hong Zhang, Xiuying Liu, Evan Trofimchuk, Shaolong Feng, Tao Ma, Xue Gao, Shubing Fang, Xiaonan Lu
Colloidal gold and Eu(3+) -doped fluorescent microspheres were applied as labels to develop the immunochromatographic strips for detecting melamine in milk. Under the optimized condition, the visual detection limit of colloidal gold-immunochromatographic test strip (ICTS) was 150 μg/L of melamine in phosphate-buffered saline (PBS), although the visual detection limit of fluorescent nanoparticles (FN)-ICTS was 75 μg/L in PBS. As thermal acceleration test, FN-ICTS could be stored at 37 °C for at least 11 d before sample testing, but the color of the lines on colloidal gold-ICTS faded away after 7-d storage...
February 13, 2017: Journal of Food Science
Cheng-Qun Xu, Kui Li, Wei-De Zhang
Nitrogen-deficient graphitic carbon nitride (CN-HAc) was synthesized by thermal condensation of acetic acid-treated melamine as a precursor. The nitrogen vacancies play a remarkable role on controlling the electronic structure of g-C3N4, such as extending the optical absorption and enhancing the separation efficiency of photogenerated charge carriers, resulting in the improvement of photocatalytic activity. The photocatalytic activity of the catalysts was evaluated by splitting water and degradation of rhodamine B (RhB) under visible light irradiation (λ>420nm)...
February 1, 2017: Journal of Colloid and Interface Science
Lei An, Wei Sun
Our previous studies showed that prenatal melamine exposure (PME) could impair spatial cognition and hippocampal long-term potentiation (LTP). More importantly, the synaptic dysfunction induced by PME was associated with the probability of presynaptic glutamate release. Considering the crucial role of the other form of synaptic plasticity, long-term depression (LTD), in some types of learning and memory process, the aim of present study was to investigate if the hippocampal LTD and cognitive flexibility were affected...
February 6, 2017: Toxicology Letters
Huijun Yu, Run Shi, Yunxuan Zhao, Tong Bian, Yufei Zhao, Chao Zhou, Geoffrey I N Waterhouse, Li-Zhu Wu, Chen-Ho Tung, Tierui Zhang
A facile synthetic strategy for nitrogen deficient graphitic carbon nitride (g-C3 Nx ) is established, involving a simple alkali-assisted thermal polymerization of urea, melamine, or thiourea. In situ introduced nitrogen vacancies significantly redshift the absorption edge of g-C3 Nx , with the defect concentration depending on the alkali to nitrogen precursor ratio. The g-C3 Nx products show superior visible-light photocatalytic performance compared to pristine g-C3 N4 .
February 10, 2017: Advanced Materials
Samah R Khalil, Ashraf Awad, Sozan A Ali
The reproductive effects of melamine and formaldehyde, either alone or in combination, on mature male Swiss mice were investigated. The animals were orally administered melamine (50mg/kg/day), formaldehyde (25mg/kg/day), a mixture of melamine and formaldehyde, or a vehicle control for 65 consecutive days. As a result, the deterioration of sperm characteristics and inhibition of testicular enzyme activity were observed in the melamine- and formaldehyde-exposed groups. In addition, testosterone and luteinizing hormone levels were significantly reduced in the melamine but not in the formaldehyde-exposed group, which correlated with down-regulation of transcription levels of steroidogenic-related genes...
February 6, 2017: Environmental Toxicology and Pharmacology
J W Martin, M K Nieuwoudt, M J T Vargas, O L C Bodley, T S Yohendiran, R N Oosterbeek, D E Williams, M Cather Simpson
The implausible combination of centrifugal disc microfluidics and un-covered channels provides a simple way in which Raman spectroscopy can be implemented in industrially-relevant lab-on-a disc technology. Here we demonstrate these advantages by detecting very low concentrations of melamine in liquid milk, without pre-processing, without surface enhancement of the Raman signal and with no evidence of spectral contamination from the polymeric chip itself. A limit of detection (LOD) of 203 ppm for melamine in milk was achieved from Raman spectra of milk after drying...
February 9, 2017: Analyst
Lingling Chang, Jingyuan Wang, Ruiping She, Longhuan Ma, Qiaoxing Wu
The male reproductive toxicity of melamine (MA) has been recognized in recent years excepted for its renal toxicity. Our previous in vivo studies revealed that the damages of Sertoli cell barrier played a critical role in MA-induced testicular toxicity in mice. Herein, we performed an in vitro study to comprehensively evaluate the toxicity of MA on Sertoli cell by examining the influences of MA on the viability, morphology, mortality and intercellular junctions of mouse TM4 Sertoli cells (TM4 cells). The results showed that MA suppressed cell viability, induced obvious ultrastructural changes and cell apoptosis in concentration-dependent manner...
January 15, 2017: Environmental Toxicology and Pharmacology
Othman Charles S Al Hamouz, Isaiah Olabisi Adelabu, Tawfik A Saleh
A novel series of polyamine/CNT composites were synthesized via a single step polycondensation reaction of melamine, paraformaldehyde, various alkyldiamines and chlorinated carbon nanotubes (CNT) at optimized reaction conditions in the presence of N, N-Dimethyl formamide as a solvent. Chlorinated carbon nanotubes synthesized by reacting acidified CNT and thionyl chloride was used. The pure polymer (MFDH) and the functionalized composites (MFDH1, MFDH2, MFDH3 and MFDH4) having 0.01, 0.02, 0.05 and 0.1% weight of the starting precursors were used...
February 1, 2017: Journal of Environmental Management
Dan Li, Di Y Lv, Qing X Zhu, Hao Li, Hui Chen, Mian M Wu, Yi F Chai, Feng Lu
Methods for the on-site analysis of food contaminants are in high demand. Although portable Raman spectroscopy is commonly used to test food on-site, it can be challenge to achieve this goal with rapid detection and inexpensive substrate. In this study, we detected trace food contaminants in samples of whole milk powder using the methods that combined chromatography with surface-enhanced Raman scattering detection (SERS). We developed a simple and efficient technique to fabricate the paper with chitosan-modified silver nanoparticles as a SERS-active substrate...
June 1, 2017: Food Chemistry
Yunjin Yao, Jie Zhang, Guodong Wu, Shaobin Wang, Yi Hu, Cong Su, Tongwen Xu
Novel iron encapsulated in nitrogen-doped carbon nanotubes (CNTs) supported on porous carbon (Fe@N-C) 3D structured materials for degrading organic pollutants were fabricated from a renewable, low-cost biomass, melamine, and iron salt as the precursors. SEM and TEM micrographs show that iron encapsulated bamboo shaped CNTs are vertically standing on carbon sheets, and thus, a 3D hybrid was formed. The catalytic activities of the prepared samples were thoroughly evaluated by activation of peroxymonosulfate for catalytic oxidation of Orange II solutions...
January 25, 2017: Environmental Science and Pollution Research International
Qianfen Zhuang, Liming Sun, Yongnian Ni
A facile, simple, and relatively environment-friendly hydrothermal approach was developed for one-step synthesis of graphitic carbon nitride nanosheets (GCNNs) using melamine and sodium citrate as the precursors. The prepared GCNNs emit strong fluorescence with a high quantum yield of 48.3%. The GCNNs were then characterized by various techniques including transmission electron microscopy, atomic force microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and UV-Vis absorption spectroscopy...
March 1, 2017: Talanta
Rui Bao, Baoyu Tan, Shuang Liang, Ning Zhang, Wei Wang, Wenguang Liu
Previous studies suggested that a stiffer hydrogel system exhibited a better performance to promote heart function after myocardial infarction (MI). However, the nature of myocardium, a tissue that alternately contracts and relaxes with electrical impulses, leads us to hypothesize that a soft and conductive hydrogel may be in favor of mechanical and electrical signals transmission to enhance heart function after MI. In this work, π-π conjugation interaction was first employed to produce a soft injectable hydrogel with conductive property...
January 12, 2017: Biomaterials
Behrouz Akbari-Adergani, Gholam-Hossein Sadeghian, Alireza Alimohammadi, Zahra Esfandiari
In this study, a new separation technique based on membrane extraction is described for the determination of melamine in dry milk. The water-compatible cellulose acetate membrane, which is photografted by melamine imprinted nanospheres, was prepared by placing the membrane into the polymerization solution containing methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as cross-linker, acetonitrile as porogen, and melamine as the template molecule. The characterization of the polymeric membrane was performed by Fourier transmission infrared spectroscopy and scanning electron microscopy...
January 18, 2017: Journal of Separation Science
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