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Silver nanocubes monolayers as a SERS substrate for quantitative analysis

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Chinese Chemical Letters 2021年第4期32卷 1497-1501页

作者： Ziang Zhou Xiuhui Bai Peishen Li Changzheng Wang Ming Guo Yang Zhang Peiren Ding Shaowei Chen Yunyun Wu Qiang Wang Laboratory for Micro-sized Functional Materials College of Elementary Education and Department of ChemistryCapital Normal UniversityBeijing 100048China School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation Beijing University of Civil Engineering and ArchitectureBeijing 100044China College of Chemistry Beijing Normal UniversityBeijing 100875China Department of Chemistry and Biochemistry University of CaliforniaSanta CruzUnited States

Surface-enhanced Raman scattering(SERS)is a powerful spectroscopic tool in quantitative analysis of molecules,where the substrate plays a critical role in determining the detection ***,a silver nanocubes/polyelectrolyte/gold film sandwich structure was prepared as a reproducible,highperformance SERS substrate by the wate r/oil inte rfacial assembly *** addition to the hot spots on the nanocubes surface,the edge-to-edge interspace of the Ag nanocubes led to marked enhancement of the SERS intensity,with a limit of detection of 10~(11)mol/L and limit of quantitation of 10~(10)mol/L for crystal *** rhodamine 6 G and crystal violet were co-adsorbed on the Ag nanocube surfaces,the characteristic SERS peaks of the two molecules remained well resolved and separated,and the peak intensities varied with the respective concentration,which could be exploited for concurrent detection of dual *** from this work indicate that organized ensembles of Ag nanocubes can serve as effective SERS substrate can for sensitive analysis for complex molecular systems.

关键词： Silver nanocube Surface enhanced raman scattering Quantitative analysis Rhodamine 6G crystal violet

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Au, Ag and Au:Ag colloidal nanoparticles synthesized by pulsed laser ablation as SERS substrates

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Progress in Natural Science:Materials International 2014年第6期24卷 569-578页

作者： M.Vinod K.G.Gopchandran Department of Optoelectronics University of Kerala

Chemically pure colloidal suspensions of gold and silver nanoparticles were synthesized using pulsed laser *** dependence of laser fl uence on the surface plasmon characteristics of the nanoparticles was ***:Ag colloidal suspensions were prepared by mixing highly monodisperse Au and Ag *** plasmon band of these mixtures was found to be highly sensitive to Au:Ag concentration ratio and wavelength of the laser beam used in the ablation *** Au:Ag mixture consists of almost spherical shaped nanostructures with a tendency to join with adjacent *** surface enhanced Raman scattering activity of the Au,Ag and Au:Ag colloidal suspensions was tested using crystal violet as probe *** in Raman signal obtained with Au:Ag substrates was found to be promising and strongly depends on its plasmon characteristics.

关键词： Laser ablation Au and Ag nanoparticles Nanocolloids Plasmon SERS crystal violet

In vivo histological diagnosis for gastric cancer using endocytoscopy

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World Journal of Gastroenterology 2017年第37期23卷 6894-6901页

作者： Issei Tsurudome Ryoji Miyahara Kohei Funasaka Kazuhiro Furukawa Masanobu Matsushita Takeshi Yamamura Takuya Ishikawa Eizaburo Ohno Masanao Nakamura Hiroki Kawashima Osamu Watanabe Masato Nakaguro Akira Satou Yoshiki Hirooka Hidemi Goto Department of Gastroenterology and Hepatology Nagoya University Graduate School of Medicine Department of Endoscopy Nagoya University Hospital Department of Pathology and Laboratory Medicine Nagoya University Hospital Department of Surgical Pathology Aichi Medical University Hospital

AIM To examine usefulness of virtual biopsy using endocytoscopy by comparing the in vivo endocytoscopic and histopathological images of gastric *** Endocytoscopy was performed in 30 patients with early gastric cancer. Of these, 26 patients showed well differentiated adenocarcinomas, while 4 patients showed poorly differentiated adenocarcinomas(including one signet ring cell carcinoma). Cancerous and non-cancerous areas were observed after double staining with 0.05% crystal violet and 0.1% methylene blue. The endocytoscopic images obtained were evaluated by an expert endoscopist and an expert pathologist without knowledge of patient clinical data, and endocytoscopic and histopathological diagnoses were *** The endocytoscopic images of the cancerous area were assessed as evaluable in 25(83.3%) and 27(90%) patients by endoscopist A and pathologist B, respectively, and those of the non-cancerous area as evaluable in 28(93.3%) and 23(76.7%) patients by the endoscopist and pathologist, respectively. The sensitivity, specificity, and diagnostic accuracy of gastric cancer diagnosis using evaluable endocytoscopic images were 88.0% and 92.9%, and 90.6% by endoscopist A, and 88.9% and 91.3%, and 90.0% by pathologist B, respectively. Evaluation of the diagnostic concordance rate between the endoscopist and the pathologist by inter-observer agreement calculation revealed no significant difference between the two observers. The inter-observer agreement(κ-value) for endocytoscopic diagnosis was 0.745. CONCLUSION Endocytoscopy is useful for the differentiation of cancerous from non-cancerous gastric mucosa, making it a promising tool for virtual biopsy.

关键词： Endocytoscopy Gastric cancer Virtual biopsy In vivo histopathology Magnifying endoscopy Double staining crystal violet Methylene blue

The Effect of Interleukin-6 on the Proliferation of Prostate Cancer Cells in Vitro and the Modulation of This Procedure

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2001年第3期21卷 225-227页

作者：邢毅飞肖亚军张齐钧鲁功成 Department of Urology Xiehe Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022

The role of interleukin-6 (IL-6) in the growth of an androgen-independent prostate cancer cell line (PC-3m) was defined and the effect of dexamethasone, which was previously shown to modulate IL-6/IL-6 receptor (IL-6R) on this procedure was investigated. By using a pretty sensitive and specific enzyme immunoassay (ELISA), it was found that PC-3m produced certain IL-6, but there was no difference in IL-6 secretion between the group with or without dexamethasone treatment. It was also found that PC-3m cells could not be stimulated to grow by exogenous IL-6 (P>0.05), while it could be inhibited to grow by anti-IL-6 monoclonal antibody and dexamethasone with a dose-dependent fashion. Our observation indicated that IL-6 acted as an autocrine growth factor for PC-3m, and dexamethasone could inhibit cell proliferation by a mechanism independent of its effect on IL-6 mRNA expression.

关键词： interleukin-6 prostate cancer dexamethasone crystal violet

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Study of the Adhesion of Clinical Strains of Staphylococcus aureus on an Abiotic Surface Using the Biofilm Ring Test^(█)

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Journal of Biomaterials and Nanobiotechnology 2012年第4期3卷 547-556页

作者： J.M.Liesse Iyamba N.B.Takaisi-Kikuni S.Dulanto J.P.Dehaye Laboratoire de Chimie biologique et medicale et de Microbiologie pharmaceutique Faculte de PharmacieUniversite libre de BruxellesBrusselsBelgium Laboratoire de Microbiologie Experimentale et Pharmaceutique Facultedes Sciences Pharmaceu-tiquesUniversite de KinshasaDemocratic Republic of Congo

Four methicillin-sensitive (MSSA) and 4 methicillin-resistant (MRSA) strains of Staphylococcus aureus were collected and isolated at the Laboratory of Bacteriology of the Provincial General Reference Hospital of Kinshasa in the Democratic Republic of Congo. The microbial adhesion to solvents (MATS) test showed that the MRSA strains had a less hydrophobic membrane than the MSSA strains. Using the Biofilm Ring Test? (BFRT?) to investigate on the adhesion of these bacterial strains to smooth surfaces, we observed that the MSSA strains adhered more rapidly than the MRSA strains. The biomass of the produced biofilm measured by the crystal violet staining method (CVSM) was more important with MSSA than with MRSA strains. Ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid (EGTA) inhibited the adhesion and the formation of a biofilm by MRSA strains;this inhibition was reversed by calcium, magnesium and manganese. The MRSA strains adhered less to silicon tubing and the adhesion was inhibited by EGTA in 2 of the 4 MRSA strains and none of the MSSA strains. In conclusion, the MSSA and MRSA strains adhered on an abiotic surface and formed a biofilm at distinct rates and with different sensitivities to ions. The results also confirm the utility as well as the limits of the BFRT? to study the adhesion of bacteria on a surface.

关键词： Biofilm Ring Test^(█) crystal violet Cell Surface Hydrophobicity Adhesion Catheter Tube

The Effect of Laser Irradiation on Surface Enhanced Raman Scattering for Silver Film

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Wuhan University Journal of Natural Sciences 1997年第1期2卷 103-106页

作者： Sheng Rongsheng Zhou Guangming Xiong Jian Xu Zhisan Michael D. Morris Zeng Yun'e

The laser irradiation effect on the SERS intensity for Ag film is discussed using crystal violet (CV) as a probe. The thickness of silver film,the etching time of the glass slide by gaseous hydrogen fluoride, and the laser irradiation time for different amounts of CV on silver films were investigated. The laser burn out model was proposed to explain the dependence of the SERS intensity of CV on the laser irradiation time.

关键词： laser irradiation SERS silver film crystal violet

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Photo Degradation of Dyes from Their Aqueous Solutions of Their Binary Mixture, Using TiO2 as the Oxidant with Different Sources of Energy

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Journal of Chemistry and Chemical Engineering 2012年第10期6卷 951-955页

作者： S. Shanthi K. Sathya Priya Department of Chemistry The Standard Fireworks Rajaratnam College for Women Sivakasi 623123 India

The photodegradation has been widely used in water and waste water treatment of all the methods like froth flotation coagulation etc., photodegradation appears to offer the best prospects for overall treatment of dyestuff effulent. Photodegradation of aniline blue and crystal violet dyes from aqueous solutions of their binary mixture was carried out using TiO2 as photocatalyst. By carrying out photodegradation, varying the experimental parameters, the optimum conditions required for maximum degradation was found out. The photodegradation of dye was carried out using different sources of energy like solar radiation and microwave radiation. The degradation studies were carried out at temperatures 25 ℃, 35 ℃ and 45 ℃ so as to calculate the rate constant and activation parameters. Both energy sources are equivalent in causing degradation in all respects except time and dose of photo catalyst. Time required is less for microwave than solar radiation, but dose of photo catalyst needed was high for microwave radiation. These results will be helpful in designing effluent treatment plants in industries.

关键词： Photo degradation semi conductor crystal violet aniline blue mixture of dyes TiO2.

Elimination of Cationic and Anionic Dyes by Natural Phosphate

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Journal of Chemistry and Chemical Engineering 2012年第8期6卷 721-725页

作者： A. Achkoun J. Naja R. M'Hamdi Applied Chemistry and Environment Laboratory University of Science and Technology Settat 577 Morocco Water and Environment Laboratory Study and Research Center of Mineral Phosphates Casablanca 25679 Morocco

The present work aims to study the adsorption, determining the ability of phosphate to remove cationic dyes, MB （methylene blue） and CV （crystal violet） and an anionic dye, the MO （methyl orange）. To explain the important reduction of pollution parameters obtained from its use as a filter bed. Natural phosphate is contacted with an aqueous solution having a concentration of 20 mg/L for 90, 45 and 20 min respectively for the MB, CV and MO. Experimental results show that the phosphate totally eliminates the CV and the WB. While, the adsorption of MO is very low. The Langmuir isotherm applies to MB and MO while the adsorption of CV uses the Freundlich isotherm.

关键词： Natural phosphate adsorption isotherm methylene blue crystal violet methyl orange adsorption kinetics.