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https://www.readbyqxmd.com/read/28738627/a-novel-ph-probe-based-on-ratiometric-fluorescent-properties-of-dicyanomethylene-4h-chromene-platform
#1
Xiaolei Liu, Jixun Han, Yan Zhang, Xiaofeng Yang, Yu Cui, Guoxin Sun
We report here a ratiometric pH probe (Z)-2-(2-(2-(4-hydroxyphenyl)-2-(pyrrolidin-1-yl)vinyl) -4H-chromen-4-ylidene)-malononitrile over the pH range of 2.44-6.00. It was synthesized by Knoevenagel Reaction from dicyanomethylene-4H-chromene and pyrrolidine. This is the first example of pyrrolidine as a part of the product structure in Knoevenagel condensation. High selectivity and sensitivity for pH variation were observed with significant fluorescent ratiometric responses and a remarkable Stokes shift (about 138nm)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738623/analysis-of-illegal-peptide-drugs-via-hilic-dad-ms
#2
Steven Janvier, Evelien De Sutter, Evelien Wynendaele, Bart De Spiegeleer, Celine Vanhee, Eric Deconinck
Biopharmaceuticals have established themselves as highly efficient medicines, and are still one of the fastest growing parts of the health-product industry. Unfortunately, the introduction of these promising new drugs went hand in hand with the creation of a black market for illegal and counterfeit biotechnology drugs. Particularly popular are the lyophilised peptides with a molecular weight of less than 5kDa. Most of them are meant for subcutaneous injection and are easily accessible via the internet. In recent years, different methods based on reversed phase liquid chromatography have been developed to detect and quantify these peptides...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738622/a-flow-based-procedure-exploiting-the-lab-in-syringe-approach-for-the-determination-of-ester-content-in-biodiesel-and-diesel-biodiesel-blends
#3
Samara Soares, Wanessa R Melchert, Fábio R P Rocha
The ester content is an important parameter to be monitored in biodiesel for evaluation of the transesterification reaction yield and for assessing the purity of the final product. This is also a relevant quality parameter in diesel/biodiesel blends to avoid frauds, because legislation establishes a minimum amount of biodiesel to be added to diesel. The official method EN14103 requires the addition of an alternative internal standard (methyl nonadecanoate) for analysis of biodiesel from bovine tallow because the methyl heptadecanoate is found in high amounts in this product...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738620/proteins-in-microbial-synthesis-of-selenium-nanoparticles
#4
Anna V Tugarova, Alexander A Kamnev
Biogenic formation of nano-sized particles composed of various materials (in particular, selenium) by live microorganisms is widespread in nature. This phenomenon has been increasingly attracting the attention of researchers over the last decade not only owing to a range of diverse applications of such nanoparticles (NPs) in nanobiotechnology, but also because of the specificity of methodologies and mechanisms of NPs formation related to "green synthesis". In this mini-review, recent data are discussed on the multifaceted role of proteins in the processes of microbial reduction of selenium oxyanions and the formation of Se NPs...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738616/3d-cuo-nanosheet-wrapped-nanofilm-grown-on-cu-foil-for-high-performance-non-enzymatic-glucose-biosensor-electrode
#5
Rui-Mei Yuan, He-Jun Li, Xue-Min Yin, Jin-Hua Lu, Lei-Lei Zhang
3D binder-free CuO nanosheets wrapped nanofilms has been in situ synthesized on Cu substrate by a simple and facile procedure, with an aim of fabricating high-performance glucose sensor. The complex morphology that the nanosheet grown on Cu subtract evolved into nanofilms and eventually converged to nanowires, is benefit for the mass transport and electro-catalysis. Compared the ECSA of the CuO modified electrode to that of the bare Cu electrode, the effective surface area during the electro-catalysis of the CuO/Cu electrode is much larger...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738615/electrochemical-magneto-immunosensor-based-on-endogenous-%C3%AE-galactosidase-enzyme-to-determine-enterotoxicogenic-escherichia-coli-f4-k88-in-swine-feces-using-square-wave-voltammetry
#6
Lorena Viviana Tarditto, María Alicia Zon, Hugo García Ovando, Nelio Roberto Vettorazzi, Fernando Javier Arévalo, Héctor Fernández
Diseases caused by enterotoxicogenic Escherichia coli F4 (K88) (ETEC F4) are a problem in swine production establishments. Due to the high rate of mortality and morbidity of E. coli infections, a rapid and accurate diagnosis is important in order to choose an appropriate treatment to reduce the economic impact. Therefore, an electrochemical magneto-immunosensor (EMI) was developed to detect and quantify ETEC F4 in swine feces samples through a direct non-competitive immunoassay. ETEC F4 was selectively captured by immunomagnetic separation...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738597/sensitive-detection-of-sulfide-based-on-the-self-assembly-of-fluorescent-silver-nanoclusters-on-the-surface-of-silica-nanospheres
#7
Yehan Yan, Kui Zhang, Huan Yu, Houjuan Zhu, Mingtai Sun, Tasawar Hayat, Ahmed Alsaedi, Suhua Wang
Hydrogen sulfide is a toxic and flammable gaseous pollutant often emitted to air as a by-product of water supply, chemical, petroleum and coal industries. It can be transferred into sulfur dioxide in the air under some meteorologic conditions. Herein, we report a novel ratiometric fluorescence method for hydrogen sulfide based on silver nanoclusters and quantum dots. The silver nanoclusters have been self-assemblied onto the surface of silica spheres, which are embedded with red fluorescent quantum dots, to form a dual-emissive nanohybrid...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738595/compound-specific-%C3%AE-13-c-and-%C3%AE-2-h-analysis-of-olive-oil-fatty-acids
#8
Mauro Paolini, Luana Bontempo, Federica Camin
Fatty acids are the most abundant biomolecules in olive oil. In this study, we describe the analytical method developed to measure the δ(13)C, and for the first time, the δ(2)H values of fatty acid methyl esters (FAMEs) extracted from olive oil triglycerides, after base-catalysed transesterification with methanol. The extracted FAMEs are analysed using Gas Chromatography Combustion/Pyrolysis Isotope Ratio Mass Spectrometry (GC-C/Py-IRMS). The method made it possible to obtain baseline separation between the peaks of the main FAMEs (C16, C18, C18:1, C18:2)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738584/production-of-stable-and-sensitive-sers-substrate-based-on-commercialized-porous-material-of-silanized-support
#9
Han Zhang, Lin Sun, Yuan Zhang, Yan Kang, Huilian Hu, Huirong Tang, Yiping Du
This paper reports accurate synthesis of a new type of surface-enhanced Raman spectroscopy (SERS) substrate based on gold nanoparticles decorated 201 red silanized diatomaceous supports. The developed SERS substrate is easy to fabricate, cost effective and offers sensitive rapid detection. The performance and stability of the SERS substrate was investigated and the results showed good SERS activity of substrate that can last for more than 6 months. Tiazophos and phosmet pesticides in aqueous solutions can be detected clearly at a low concentration of 0...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738580/true-lab-in-a-syringe-technology-for-bioassays
#10
Lenka Hárendarčíková, Daniel Baron, Andrea Šebestová, Jan Rozsypal, Jan Petr
In our work, we introduced a novel concept of the lab-in-a-syringe tests. We solved the problem of detection in already published LIS tests by putting all the reaction and detection pads directly into the syringe barrel. We also used more layers to make the results visible for users. Two detection layouts: (i) with using rounded pads-based detection, and (ii) with using rectangular detection pads, were studied. As the proof of concept, we studied the determination of Ni(II) using dimethylglyoxime as the reagent and blocking of the interference of Fe(II)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738576/development-of-ph-responsive-polymer-and-citrate-aqueous-two-phase-system-for-extractive-bioconversion-of-cefprozil
#11
Jialing Chen, Zhaoyang Ding, Hongxia Pan, Xuejun Cao
A pH-responsive aqueous two-phase system (pH-ATPS) has been developed by sodium citrate and a recyclable pH-responsive polymer PADB6.8 that can response to the change of pH values. Phase separation mechanism is studied through Low field-NMR. All variables affecting the phase separation are evaluated. Phase characteristics (viscosity, density, interfacial tension) and phase separation kinetic are studied for understanding of separation process and operational parameters in applications. This pH-ATPS has the characters of low interfacial tension, high recovery leading efficient mass transfer and low cost...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738572/sequential-determination-of-nickel-and-cadmium-in-tobacco-molasses-and-refill-solutions-for-e-cigarettes-samples-by-molecular-fluorescence
#12
María Carolina Talio, Magdalena Alesso, Mariano Acosta, Verónica S Wills, Liliana P Fernández
In this work, a new procedure was developed for separation and preconcentration of nickel(II) and cadmium(II) in several and varied tobacco samples. Tobacco samples were selected considering the main products consumed by segments of the population, in particular the age (youth) and lifestyle of the consumer. To guarantee representative samples, a randomized strategy of sampling was used. In the first step, a chemofiltration on nylon membrane is carried out employing eosin (Eo) and carbon nanotubes dispersed in sodium dodecylsulfate (SDS) solution (phosphate buffer pH 7)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738551/biomass-saccharification-is-largely-enhanced-by-altering-wall-polymer-features-and-reducing-silicon-accumulation-in-rice-cultivars-harvested-from-nitrogen-fertilizer-supply
#13
Zahoor, Dan Sun, Ying Li, Jing Wang, Yuanyuan Tu, Yanting Wang, Zhen Hu, Shiguang Zhou, Lingqiang Wang, Guosheng Xie, Jianliang Huang, Aftab Alam, Liangcai Peng
In this study, two rice cultivars were collected from experimental fields with seven nitrogen fertilizer treatments. All biomass samples contained significantly increased cellulose contents and reduced silica levels, with variable amounts of hemicellulose and lignin from different nitrogen treatments. Under chemical (NaOH, CaO, H2SO4) and physical (hot water) pretreatments, biomass samples exhibited much enhanced hexoses yields from enzymatic hydrolysis, with high bioethanol production from yeast fermentation...
July 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738550/employing-microbial-electrochemical-technology-driven-electro-fenton-oxidation-for-the-removal-of-recalcitrant-organics-from-sanitary-landfill-leachate
#14
Muhammad Hassan, Narcis Pous, Bing Xie, Jesús Colprim, M Dolors Balaguer, Sebastia Puig
The feasibility of employing Microbial Electrochemical Technology (MET)-driven electro-Fenton oxidation was evaluated as a post-treatment of an anammox system treating sanitary landfill leachate. Two different MET configuration systems were operated using effluent from partial nitrification-anammox reactor treating mature leachate. In spite of the low organic matter biodegradability of the anammox's effluent (2401±562mgCODL(-1); 237±57mgBOD5L(-1)), the technology was capable to reach COD removal rates of 1077-1244mgL(-1)d(-1) with concomitant renewable electricity production (43...
July 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738546/a-new-method-for-the-simultaneous-enhancement-of-methane-yield-and-reduction-of-hydrogen-sulfide-production-in-the-anaerobic-digestion-of-waste-activated-sludge
#15
Xiaohu Dai, Chongliang Hu, Dong Zhang, Yinguang Chen
The biogas generated from anaerobic digestion (AD) also includes undesirable by-product such as hydrogen sulfide (H2S), which must be removed before the biogas can be used as a clean energy source. Therefore, it is necessary to find an appropriate strategy to simultaneously enhance the methane yield and reduce H2S production. An efficient strategy-pretreating sludge at pH 10 for 8d and adjusting the system at neutral pH to produce methane for 20d-is reported for the synchronous enhancement of methane production and reduction of H2S production during AD...
July 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738544/a-xylanase-aided-enzymatic-pretreatment-facilitates-cellulose-nanofibrillation
#16
Lingfeng Long, Dong Tian, Jinguang Hu, Fei Wang, Jack Saddler
Although biological pretreatment of cellulosic fiber based on endoglucanases has shown some promise to facilitate cellulose nanofibrillation, its efficacy is still limited. In this study, a xylanase-aided endoglucanase pretreatment was assessed on the bleached hardwood and softwood Kraft pulps to facilitate the downstream cellulose nanofibrillation. Four commercial xylanase preparations were compared and the changes of major fiber physicochemical characteristics such as cellulose/hemicellulose content, gross fiber properties, fiber morphologies, cellulose accessibility/degree of polymerization (DP)/crystallinity were systematically evaluated before and after enzymatic pretreatment...
July 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738536/effect-of-apigenin-kaempferol-and-resveratrol-on-the-gene-expression-and-protein-secretion-of-tumor-necrosis-factor-alpha-tnf-%C3%AE-and-interleukin-10-il-10-in-raw-264-7-macrophages
#17
Marta Palacz-Wrobel, Paulina Borkowska, Monika Paul-Samojedny, Malgorzata Kowalczyk, Anna Fila-Danilow, Renata Suchanek-Raif, Jan Kowalski
Polyphenols such as apigenin, kaempferol or resveratrol are typically found in plants, including fruits, vegetables, herbs and spices, which have a wide range of biological functions such as antioxidative, anti-inflammatory, vasodilative, anticoagulative and proapoptotic. Discovering such multifunctional compounds in widely consumed plant-based products - ones that both inhibit the release of TNF-α from tissue macrophages and at the same time enhance the secretion of IL-10 - would be an important signpost in the quest for effective pharmacological treatment of numerous diseases that have an inflammatory etiology...
July 20, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28738530/prenatal-low-level-phenol-exposures-and-birth-outcomes-in-china
#18
Guodong Ding, Caifeng Wang, Angela Vinturache, Shasha Zhao, Rui Pan, Wenchao Han, Limei Chen, Weiye Wang, Tao Yuan, Yu Gao, Ying Tian
Phenolic compounds are among the endocrine disruptors which are widely used in daily life products. Studies in laboratory animals showed reproductive and developmental effects. In spite of widespread exposure to phenols, only few studies examined their effects on human development. This study was designed to investigate the relationship between antenatal phenol exposure and birth outcomes in a Chinese obstetric population. Four hundred ninety-six mother-infant pairs recruited from the Laizhou Wan prospective birth cohort in northern China between 2010 and 2013 were included in the study...
July 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28738517/modelling-long-term-impacts-of-changes-in-climate-nitrogen-deposition-and-ozone-exposure-on-carbon-sequestration-of-european-forest-ecosystems
#19
Wim de Vries, Maximilian Posch, David Simpson, Gert Jan Reinds
We modelled the effects of past and expected future changes in climate (temperature, precipitation), CO2 concentration, nitrogen deposition (N) and ozone (O3) exposure (phytotoxic ozone dose, POD) on carbon (C) sequestration by European forest ecosystems for the period 1900-2050. Tree C sequestration was assessed by using empirical response functions, while soil C sequestration was simulated with the process-based model VSD, combined with the RothC model. We evaluated two empirical growth responses to N deposition (linear and non-linear) and two O3 exposure relationships (linear function with total biomass or net annual increment)...
July 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28738515/characterization-of-carbon-dioxide-concentrating-chemolithotrophic-bacterium-serratia-sp-istd04-for-production-of-biodiesel
#20
Manish Kumar, Raj Morya, Edgard Gnansounou, Christian Larroche, Indu Shekhar Thakur
Proteomics and metabolomics analysis has become a powerful tool for characterization of microbial ability for fixation of Carbon dioxide. Bacterial community of palaeoproterozoic metasediments was enriched in the shake flask culture in the presence of NaHCO3. One of the isolate showed resistance to NaHCO3 (100mM) and was identified as Serratia sp. ISTD04 by 16S rRNA sequence analysis. Carbon dioxide fixing ability of the bacterium was established by carbonic anhydrase enzyme assay along with proteomic analysis by LC-MS/MS...
July 14, 2017: Bioresource Technology
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