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https://www.readbyqxmd.com/read/30342135/chitosan-silver-nanocomposites-for-colorimetric-detection-of-glucose-molecule
#1
Muthuchamy Maruthupandy, Govindan Rajivgandhi, Thillaichidambaram Muneeswaran, Thirumalaiswamy Vennila, Franck Quero, Ji-Ming Song
This study was about the simple method for the rapid colorimetric and visual detection of glucose molecules in water medium. Silver nanoparticles were spread on the chitosan surface (CS/Ag NCs) and it was characterized by UV-visible spectroscopy, fourier transform infrared spectroscopy (FTIR), X-ray diffraction spectroscopy (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The CS/Ag NCs displayed a strong surface plasmon resonance band at 429 nm which disappears in the addition of accelerative concentrations of glucose molecules and it was attended by color alteration from yellow to colorless...
October 17, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30340574/the-leaves-of-crataeva-nurvala-buch-ham-modulate-locomotor-and-anxiety-behaviors-possibly-through-gabaergic-system
#2
Md Moniruzzaman, Md Abdul Mannan, Md Farhad Hossen Khan, Ariful Basher Abir, Mirola Afroze
BACKGROUND: Crataeva nurvala Buch-Hum is an indigenous herb, extensively used in traditional medicines of the South Asian countries to treat inflammation, rheumatic fever, gastric irritation, and constipation. Despite this wide range of uses, very little information is known regarding its effects on the central nervous system (CNS). Therefore, this study evaluated the neuropharmacological properties of methanolic extract of Crataeva nurvala leaves (MECN) using a number of behavioral models in animals...
October 19, 2018: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/30340459/protective-role-of-down-regulated-microrna-31-on-intestinal-barrier-dysfunction-through-inhibition-of-nf-%C3%AE%C2%BAb-hif-1%C3%AE-pathway-by-binding-to-hmox1-in-rats-with-sepsis
#3
Cheng-Ye Zhan, Di Chen, Jin-Long Luo, Ying-Hua Shi, You-Ping Zhang
BACKGROUND: Intestinal barrier dysfunction is a significant clinical problem, commonly developing in a variety of acute or chronic pathological conditions. Herein, we evaluate the effect of microRNA-31 (miR-31) on intestinal barrier dysfunction through NF-κB/HIF-1α pathway by targeting HMOX1 in rats with sepsis. METHODS: Male Sprague-Dawley rats were collected and divided into the sham group, and the cecum ligation and perforation group which was subdivided after CACO-2 cell transfection of different mimic, inhibitor, or siRNA...
October 19, 2018: Molecular Medicine
https://www.readbyqxmd.com/read/30340210/a-coumarin-based-fluorescent-probe-for-rapidly-distinguishing-of-hypochlorite-and-copper-ii-ion-in-organisms
#4
Yong Tang, Yuanyuan Li, Juan Han, Yanli Mao, Liang Ni, Yun Wang
A dual-functional fluorescent probe based on coumarin fluorophore for monitoring ClO- and Cu2+ was synthesized and characterized. The identification mechanisms for ClO- and Cu2+ induced different colorimetric and ratiometric changes. ClO- caused a colorimetric change from yellow to colorless and 120 nm blue-shifted emission spectra from red to blue. Besides, Cu2+ induced a remarkable fluorescence quenching behavior and 36 nm blue-shifted absorption spectra accompanied by the color change from yellow to luminous yellow...
October 14, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/30340207/sequential-displacement-strategy-for-selective-and-highly-sensitive-detection-of-zn-2-hg-2-and-s-2-ions-an-approach-toward-a-molecular-keypad-lock
#5
Subrata Kumar Padhan, Jitendra Palei, Punam Rana, Narayan Murmu, Satya Narayan Sahu
A thiocarbonohydrazone locked salicylidene based macrocycle ligand L has been synthesized and its ion sensing properties were examined by UV-visible and fluorescence spectroscopy. The macrocycle serves as a highly selective colorimetric sensor for Hg2+ ions while it acts as an excellent fluorescent sensor for Zn2+ ions by exhibiting a green fluorescence at 498 nm even in the presence of interfering ions. A detailed analysis of binding characteristics such as complex stoichiometry, association constant and detection limits of L toward Hg2+ and Zn2+ ions were evaluated by UV-visible and fluorescence experiments which revealed a stronger binding affinity and higher detection limit of L toward the mercury ions...
October 15, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/30339643/can-applications-designed-to-evaluate-visual-function-be-used-in-different-ipads
#6
Dolores de Fez, Mari José Luque, Maria Carmen García-Domene, Maria Teresa Caballero, Vicente J Camps
SIGNIFICANCE: Apple devices could be suitable for vision tests, provided that the test has been correctly adapted to the device, after considering the spatial and colorimetric characterization of the screen. PURPOSE: The majority of vision applications has not been developed by vision or colorimetry experts and suffers from conceptual and design errors that may lead average users to an erroneous assessment of their visual capabilities. The reliability of vision tests depends on the accurate generation of the necessary visual stimuli in a particular device...
October 18, 2018: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/30338283/fluoride-concentration-data-in-groundwater-resources-of-gonabad-iran
#7
Abbasali Karimi, Majid Radfard, Morteza Abbasi, Ali Naghizadeh, Hamed Biglari, Vida Alvani, Mokhtar Mahdavi
The data was obtained from fluoride ion concentrations determined in groundwater sources of Gonabad. A number of 144 samples from 12 drinking groundwater wells located in different regions at the mid of spring, summer, autumn and winter from each regions, were collected from spring 2016 to spring of 2017. The fluoride ions in the samples were determined through the SPADNS colorimetric method at a wavelength of 580 nm. Dispersion of fluoride ions in terms of concentration in groundwater resources of Gonabad was planned using geographic information system (GIS) base on inverse distance weighted (IDW) method...
December 2018: Data in Brief
https://www.readbyqxmd.com/read/30335609/metabolomic-fingerprint-of-mentha-rotundifolia-l-leaf-tissues-promotes-this-species-as-a-potential-candidate-for-sustainable-production-of-biologically-active-molecules
#8
Leila Riahi, Hanen Chakroun, Imen Klay, Ahmed Slaheddine Masmoudi, Ameur Cherif, Nejia Zoghlami
Background The Mentha rotundifolia L. (Lamiaceae family), is a medicinal herb used since the ancient times as an antiseptic, analgesic and anti-inflammatory agent. In the present work, metabolomic profiling of two Mentha rotundifolia L. ecotypes leaf tissues spontaneously growing in the North of Tunisia was achieved. Methods Phenolic contents (TPC, TFC and TTC) were assessed using colorimetric methods. Metabolomic profiling of leaf tissues extracts was assessed based on Gas Chromatography-Mass Spectrometry (GC/MS) analysis...
October 17, 2018: Journal of Complementary & Integrative Medicine
https://www.readbyqxmd.com/read/30333894/expansion-of-the-substrate-specificity-of-porcine-kidney-d-amino-acid-oxidase-for-s-stereoselective-oxidation-of-4-cl-benzhydrylamine
#9
Kazuyuki Yasukawa, Fumihiro Motojima, Atsushi Ono, Yasuhisa Asano
Discovery and development of enzymes for the synthesis of chiral amines have been a hot topic for basic and applied aspects of biocatalysts. Based on our X-ray crystallographic analyses of porcine kidney D-amino acid oxidase (pkDAO) and its variants, we rationally designed a new variant that catalyzed the oxidation of ( S )-4-Cl-benzhydrylamine (CBHA) from pkDAO and obtained it by functional high-throughput screening with colorimetric assay. The variant I230A/R283G was constructed from the variant R283G which had completely lost the activity for D-amino acids, further gaining new activity toward ( S )-chiral amines with the bulky substituents...
August 21, 2018: ChemCatChem
https://www.readbyqxmd.com/read/30333642/durum-wheat-breads-high-in-fibre-and-with-reduced-in-vitro-glycaemic-response-obtained-by-partial-semolina-replacement-with-minor-cereals-and-pulses
#10
Donatella Bianca Maria Ficco, Serena Muccilli, Lucia Padalino, Virgilio Giannone, Lucia Lecce, Valentina Giovanniello, Matteo Alessandro Del Nobile, Pasquale De Vita, Alfio Spina
The aim of this study was to develop fortified breads of durum wheat semolina (DW) partially substituted at 10%, 15%, 20% and 30% with white sorghum or yellow pea wholemeal flours (WS, YP, respectively) or using wholemeal flour from a natural mixture of rye and durum wheat (RDW). The physico-chemical composition of the raw materials, rheological properties of dough, the bread quality characteristics, glycaemic index and sensory quality of bread were examined. Compared to 100% DW, 100% YP had twice the protein levels, RDW had almost three times the dietary fibre, while the colorimetric indices for WS and YP flour addition showed increased redness (for RDW) and similar yellowness (for YP)...
November 2018: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/30332803/dual-sensing-performance-of-1-2-squaraine-for-the-colorimetric-detection-of-fe-3-and-hg-2-ions
#11
Xiaoqian Liu, Na Li, Min-Min Xu, Chunhui Jiang, Jianhao Wang, Guoqiang Song, Yong Wang
A simple 1,2-squaraine based chemosensor material (SQ) has been reported to show dual sensing performance for colorimetric detection of Fe3+ and Hg2+ ions. Compared to common instrumental analysis, this method could provide fast and direct detection though colorimetric changes by the naked eye. The sensor has shown excellent selectivity over the other metal ions by tuning different solvent environments. The detection limit for Fe3+ could reach to 0.538 μM, which was lower than that in the environmental agency guideline (U...
October 16, 2018: Materials
https://www.readbyqxmd.com/read/30332750/a-new-environmentally-friendly-colorimetric-probe-for-formaldehyde-gas-detection-under-real-conditions
#12
Carlos Martínez-Aquino, Ana M Costero, Salvador Gil, Pablo Gaviña
A new environmentally-friendly, simple, selective and sensitive probe for detecting formaldehyde, based on naturally-occurring compounds, through either colorimetric or fluorescence changes, is described. The probe is able to detect formaldehyde in both solution and the gas phase with limits of detection of 0.24 mM and 0.7 ppm, respectively. The probe has been tested to study formaldehyde emission in contaminated real atmospheres. The supported probe is easy to use and to dispose, and is safe and suitable as an individual chemodosimeter...
October 16, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/30327808/smartphone-based-analytical-biosensors
#13
REVIEW
Xiwei Huang, Dandan Xu, Jin Chen, Jixuan Liu, Yangbo Li, Jing Song, Xing Ma, Jinhong Guo
The traditional analytical biosensor instruments are relatively bulky, expensive, and not easy to handle, thus their applications are largely limited in resource-limited settings. The recent development of microfluidic lab-on-a-chip (LOC) technology has provided a possible solution to miniaturize the conventional biosensing system, yet other accessory devices to detect, readout, analyze, transfer, and display results are still required. With the rapid development, mass production, and pervasive distribution of smartphones in recent years, they have provided people with portable, cost-effective, and easy-to-operate platforms to build analytical biosensors for point-of-care (POC) applications and mobile health...
October 17, 2018: Analyst
https://www.readbyqxmd.com/read/30327680/genotoxic-and-chemopreventive-effects-of-vochysia-divergens-leaves-pantanal-brazil
#14
Pollyanna Francielli de Oliveira, Suzana Amorim Mendes, Nathália Oliveira Acésio, Luis Claudio Kellner Filho, Leticia Pereira Pimenta, Kátia Aparecida Siqueira, Marcos Antônio Soares, Ana Helena Januário, Denise Crispim Tavares
The medicinal plant Vochysia divergens is a colonizing tree species of the Pantanal, a unique and little explored wetland region in Brazil. This species is used in folk medicine as syrups and teas to treat respiratory infections, digestive disorders, asthma, scarring, and skin diseases. The objectives of this study were to evaluate the antioxidant, cytotoxic, and genotoxic potential of the ethanolic extract of Vochysia divergens leaves (VdE), as well as the influence of VdE and its major component (the flavone 3',5-dimethoxy luteolin-7- O - β -glucopyranoside; 3'5 DL) on MMS-induced genotoxicity...
2018: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/30327108/colorimetric-sensor-for-the-detection-of-h-2-s-and-its-application-in-molecular-half-subtractor
#15
Rahul Kaushik, Amrita Ghosh, Ajeet Singh, D Amilan Jose
Azine based new colorimetric sensor 1 for the detection of gasotransmitter H2 S has been reported. Sensor 1 used to detect the H2 S with a remarkable red shift of 105 nm in the absorption spectra with a colour change from light yellow to brown red. Importantly, rare example of azine derivative has been used as a colorimetric probe for H2 S detection using deprotonation mechanism. H2 S induced deprotonation of one of the -OH proton followed by a change in resonance of 1 is responsible for the ratiometric spectral and colour change...
December 21, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30327106/detection-of-nitrite-with-a-surface-enhanced-raman-scattering-sensor-based-on-silver-nanopyramid-array
#16
Peng Zheng, Sujan Kasani, Xiaofei Shi, Ashley E Boryczka, Feng Yang, Haibin Tang, Ming Li, Wanhong Zheng, Daniel E Elswick, Nianqiang Wu
Nutrient pollution is of worldwide environmental and health concerns due to extensive use of nitrogen fertilizers and release of livestock waste, which induces nitrite compounds in aquatic systems. Herein a surface-enhanced Raman scattering (SERS) sensor is developed for nitrite detection based on coupling between the plasmonic gold nanostars and the silver nanopyramid array. When nitrite is present in the assay, an azo group is formed between the 1-naphthylamine-functionalized silver nanopyramids and the 4-aminothiophenol-functionalized gold nanostars...
December 21, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30324953/fluorescent-ti-3-c-2-mxene-quantum-dots-for-an-alkaline-phosphatase-assay-and-embryonic-stem-cell-identification-based-on-the-inner-filter-effect
#17
Zheng Guo, Xiaohua Zhu, Shigong Wang, Chunyang Lei, Yan Huang, Zhou Nie, Shouzhuo Yao
As an emerging two-dimensional material, MXenes have attracted much attention due to their unique physicochemical properties, but their application in biosensing has been lagging far behind because of their poor salt tolerance. Herein, a titanium carbide MXene quantum dot (Ti3C2 QD)-based fluorescent probe for the alkaline phosphatase (ALP) activity assay and embryonic stem cell (ESC) identification was developed by taking advantage of the inner filter effect (IFE). Ti3C2 QDs with ∼4.2 nm in diameter were prepared from Ti3C2 MXenes by hydrothermal treatment, exhibiting excellent salt tolerance, anti-photobleaching and dispersion stability in aqueous solution...
October 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/30323640/urinary-tgf-%C3%AE-1-was-not-independently-associated-with-renal-function-in-diabetes-mellitus
#18
Rani Sauriasari, Mia Yuliana Pratiwi
Background: Several clinical studies have shown increased level of urinary TGF-β1 in diabetic nephropathy patients and its correlation with urine albumin-to-creatinine ratio (UACR), but other studies showed different results. Because of this contradiction, this study aims to analyze the correlation between urinary TGF-β1 concentration and UACR, and also estimated glomerular filtration rate (eGFR) in type 2 diabetes mellitus (DM) patients by controlling some confounding factors. Methods: This was a cross-sectional study, and the samples were obtained using consecutive sampling technique...
2018: Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy
https://www.readbyqxmd.com/read/30323038/method-dependent-epidemiological-cutoff-values-ecvs-for-detection-of-triazole-resistance-in-candida-and-aspergillus-species-for-the-syo-colorimetric-broth-and-etest-agar-diffusion-methods
#19
A Espinel-Ingroff, J Turnidge, A Alastruey-Izquierdo, F Botterel, E Canton, C Castro, Y-C Chen, Y Chen, E Chryssanthou, E Dannaoui, G Garcia-Effron, G M Gonzalez, N P Govender, J Guinea, S Kidd, M Lackner, C Lass-Flörl, M J Linares-Sicilia, L López-Soria, R Magobo, T Pelaez, G Quindós, M A Rodriguez-Iglesia, M A Ruiz, F Sánchez-Reus, M Sanguinetti, R Shields, P Szweda, A Tortorano, N L Wengenack, S Bramati, C Cavanna, C DeLuca, M Gelmi, A Grancini, G Lombardi, J Meletiadis, C E Negri, M Passera, J Peman, A Prigitano, E Sala, M Tejada
Although the Sensitrite Yeast-One (SYO) and Etest methods are widely utilized, interpretive criteria are not available for triazole susceptibility testing of Candida or Aspergillus species. We collected fluconazole, itraconazole, posaconazole and voriconazole SYO and Etest MICs from 39 laboratories representing all continents for (method-agent-dependent): 11,171 Candida albicans , 215 C. dubliniensis , 4,418 C. glabrata species complex (SC), 157 C. ( Meyerozyma ) guilliermondii , 676 C. krusei ( Pichia kudriavzevii ), 298 C ( Clavispora ) lusitaniae , 911 and 3,691 C...
October 15, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/30322542/detection-of-chloramphenicol-using-a-novel-apta-sensing-platform-based-on-aptamer-terminal-lock-in-milk-samples
#20
Mahbobeh Javidi, Mohammad Reza Housaindokht, Asma Verdian, Bibi Marzieh Razavizadeh
In this paper, a novel apta-sensing colorimetric platform for rapid detection of chloramphenicol (CAP) in raw milk was developed. The AuNPs are stabilized by short-sequences aptamers against salt induced aggregation and this is the base of most colorimetric aptasensors development. However, the statute shows low sensitivity for the long-sequence aptamers. Herein, we propose an alternative strategy that use intact long-sequence aptamers for develop a highly sensitive AuNP-based colorimetric aptasensor. Determination of CAP in animal derived foods is an urgent demanded in the effort to minimize food safety risk...
December 18, 2018: Analytica Chimica Acta
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