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https://www.readbyqxmd.com/read/29908986/hydroquinone-exposure-worsens-the-symptomatology-of-rheumatoid-arthritis
#1
Cintia Scucuglia Heluany, Leonard de Vinci Kanda Kupa, Mariana Nascimento Viana, Cristina Maria Fernandes, Sandra Helena Poliselli Farsky
The genesis of rheumatoid arthritis (RA) is complex and dependent on genetic background and exposure to environmental xenobiotic. Indeed, smoking is associated to developing and worsening pre-existing RA. Nevertheless, the mechanisms and cigarette compounds involved in the harmful processes have not been elucidated. Here, we investigated if the exposure to hydroquinone (HQ), an abundant pro-oxidative compound of cigarette and benzene metabolite, could worsen the ongoing RA. Hence, collagen-induced arthritis (CIA) was induced in male Wistar rats by s...
June 14, 2018: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29886520/amperometric-immunoassay-for-the-obesity-biomarker-amylin-using-a-screen-printed-carbon-electrode-functionalized-with-an-electropolymerized-carboxylated-polypyrrole
#2
Gonzalo Martínez-García, Esther Sánchez-Tirado, Araceli González-Cortés, Paloma Yáñez-Sedeño, José M Pingarrón
Amylin (the islet amyloid polypeptide) is a hormone related to adiposity, hunger and satiety. It is co-secreted with insulin from pancreatic B-cells. An amperometric immunosensor is presented here for the determination of amylin. It is making use of a screen printed carbon electrode (SPCE) functionalized with electropolymerized poly(pyrrole propionic acid) (pPPA) with abundant carboxyl groups that facilitate covalent binding of antibody against amylin. A competitive immunoassay was implemented using biotinylated amylin and streptavidin labeled with horse radish peroxidase (HRP-Strept) as the enzymatic tracer...
June 9, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29863859/an-azoaromatic-ligand-as-four-electron-four-proton-reservoir-catalytic-dehydrogenation-of-alcohols-by-its-zinc-ii-complex
#3
Rajib Pramanick, Rameswar Bhattacharjee, Debabrata Sengupta, Ayan Datta, Sreebrata Goswami
Electroprotic storage materials, though invaluable in energy-related research, are scanty among non-natural compounds. Herein, we report a zinc(II) complex of the ligand 2,6-bis(phenylazo)pyridine (L), which acts as a multiple electron and proton reservoir during catalytic dehydrogenation of alcohols to aldehydes/ketones. The redox-inactive metal ion Zn(II) serves as an oxophilic Lewis acid, while the ligand behaves as efficient storage of electron and proton. Synthesis, X-ray structure, and spectral characterizations of the catalyst, ZnLCl2 (1a) along with the two hydrogenated complexes of 1a, ZnH2 LCl2 (1b), and ZnH4 LCl2 (1c) are reported...
June 4, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29858994/ultrasound-assisted-adsorption-of-phenol-from-aqueous-solution-by-using-spent-black-tea-leaves
#4
Asmat Ali, Muhammad Bilal, Romana Khan, Robina Farooq, Maria Siddique
This study is conducted to examine the removal of phenol using spent black tea leaves (SBTL) by the process of ultrasound-assisted adsorption. The effect of different treatment processes, i.e., sonolysis, adsorption, and ultrasound-assisted adsorption, was investigated. The morphology of SBTL was studied using a scanning electron microscope (SEM), and the porous structure of the SBTL was identified before phenol was adsorbed onto the adsorbent. FTIR analysis of SBTL after adsorption showed the presence of an aliphatic band of carboxylic acids which depict degradation of the phenol molecule due to ultrasound-assisted adsorption...
June 1, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29851386/influence-of-water-matrix-species-on-persulfate-oxidation-of-phenol-reaction-kinetics-and-formation-of-undesired-degradation-byproducts
#5
Jie Ma, Haiyan Li, Yongqi Yang, Xuening Li
The present study explored the influence of Cl- , Br- , CO3 2- , HCO3 - , PO4 3- , HPO4 2- , NO3 - , SO3 2- and natural organic matter (NOM) on the reaction kinetics and the formation of undesired degradation byproducts during phenol oxidation by heat-activated persulfate (PS). CO3 2- and PO4 3- promoted the phenol degradation, because the hydrolysis of CO3 2- and PO4 3- created basic pH conditions which were conducive to enhanced PS oxidation rate. Br- promoted the reaction by reacting with sulfate radicals (SO4 •- ) to produce bromine radicals that can selectively react with electron-rich phenol...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29799808/health-knowledge-cosmetic-interests-attitude-and-the-need-for-health-education-regarding-the-use-of-topical-bleaching-agents-among-women-in-west-saudi-arabia-a-cross-sectional-study
#6
Mariam Eid Alanzi, Riyadh A Alghamdi, Osama Mohammed Alsharif, Khaled S Alghamdi, Salah Mohammed El Sayed
We aimed at investigating the cosmetic interests, public confidence in cosmetic industry, health knowledge, practice, and need for health education regarding using topical bleaching agents (TPAs) among a relatively big sample size in Al-Madinah (west Saudi Arabia, a conservative eastern society that acquires its social customs from Islam). Islamic values increased women respect and esteem in this society. This is reflected on cosmetic practices and attitude, e.g. women use face cover outdoors. This issue is vital for both women health and beauty, and is rarely discussed...
March 2018: Journal of Cosmetic Science
https://www.readbyqxmd.com/read/29799128/when-hydroquinone-meets-methoxy-radical-hydrogen-abstraction-reaction-from-the-viewpoint-of-interacting-quantum-atoms
#7
Milena Petković, Đura Nakarada, Mihajlo Etinski
Interacting Quantum Atoms methodology is used for a detailed analysis of hydrogen abstraction reaction from hydroquinone by methoxy radical. Two pathways are analyzed, which differ in the orientation of the reactants at the corresponding transition states. Although the discrepancy between the two barriers amounts to only 2 kJ/mol, which implies that the two pathways are of comparable probability, the extent of intra-atomic and inter-atomic energy changes differs considerably. We thus demonstrated that Interacting Quantum Atoms procedure can be applied to unravel distinct energy transfer routes in seemingly similar mechanisms...
May 25, 2018: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/29792028/in-situ-structural-elucidation-and-selective-pb2-ion-recognition-of-polydopamine-film-formed-by-controlled-electrochemical-oxidation-of-dopamine
#8
K S Shalini Devi, Sharu Jacob, Annamalai Senthil Kumar
Owing to the versatility and biocompatibility, a self-polymerized DA (in presence of air at pH 8.5 tris buffer solution) as a polydopamine (pDA) film has been used for a variety of applications. Indeed, instability under electrified condition (serious surface-fouling) and structural ambiguity of the pDA have been found to be unresolved problems. Previously, pDA films (has hygroscopic and insoluble property) prepared by various controlled chemical oxidation methods have been examined for the structural analysis using ex-situ solid-state NMR and Mass Spectroscopic techniques...
May 24, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29790650/a-redox-based-superoxide-generation-system-using-quinone-quinone-reductase
#9
Shailesh Kumar Singh, Syed Masood Husain
Superoxide (O2*-) generation in biological systems is achieved through some of the most complex enzymatic systems. Of these, only the xanthine/xanthine oxidase has been used for in vitro biochemical studies. However, it suffers from limitations such as, lack of suitable heterologous expression system for xanthine oxidase and the irreversible consumption along with low solubility of xanthine under physiological conditions. Here, we report a redox-based, enzyme-catalyzed system where autoxidation of hydroquinone to quinone via semiquinone results in superoxide generation...
May 23, 2018: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29790609/detection-of-hydroquinone-by-raman-spectroscopy-in-patients-with-melasma-before-and-after-treatment
#10
R Cabrera-Alonso, E Guevara, M G Ramírez-Elías, B Moncada, F J González
BACKGROUND: Melasma is an acquired, facial hyperpigmentation without a specific origin. It is regularly associated with multiple etiologic factors such as pregnancy, genetic, racial, and from estrogen administration. Among the methods to treat skin hyperpigmentation a series of skin bleaching agents have been used. At present, the most commonly used agent is known as hydroquinone. Nowadays, it is known that hydroquinone can cause cancer in animals with unknown relevance to humans. MATERIAL AND METHODS: In this work, Raman spectroscopy was used to observe the presence of hydroquinone in the skin of 18 patients who have been under treatment for melasma...
May 23, 2018: Skin Research and Technology
https://www.readbyqxmd.com/read/29763796/raw-hematite-based-fe-iii-bio-reduction-process-for-humified-landfill-leachate-treatment
#11
Rui Li, Yu Jiang, Beidou Xi, Mingxiao Li, Xiaoguang Meng, Chuanping Feng, Xuhui Mao, Hongliang Liu, Yonghai Jiang
Microorganisms from paddy soils and raw hematite are used for enhancing natural Fe(III) bio-reduction, in order to remove macromolecular organic pollutants from humified landfill leachate. Based on batch experiments, 60% of refractory organics can be adsorbed by hematite in 12 days. In the presence of Fe(III)-reducing bacteria, 489.60 ± 0.14 mg L-1 of dissolved organic matters can be degraded to 51.90 ± 3.96 mg L-1 within 50 days; twelve types of semi volatile organic compounds can be degraded; hereby, the reaction follows a first-order kinetics...
May 3, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29759192/the-polystyrene-divinylbenzene-stationary-phase-hybridized-with-oxidized-nanodiamonds-for-liquid-chromatography
#12
Zhongping Huang, Peng Yao, Qiulian Zhu, Lili Wang, Yan Zhu
A novel polystyrene-divinylbenzene microspheres hybridized with oxidized nanodiamonds (PS-DVB-OND) was synthesized by the method of seed swelling and polymerization. The oxidized nanodiamonds (OND) were characterized by Fourier transform infrared (FTIR) spectra, X-ray phtoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), X-ray diffraction (XRD). PS-DVB-OND particles were characterized by scanning electron microscopy (SEM) and transmission electron microscope (TEM). The result suggested that OND were successfully embedded into the polymer microspheres with the diameter of 6 ± 2 µm...
August 1, 2018: Talanta
https://www.readbyqxmd.com/read/29753209/understanding-the-energy-level-matching-relationships-between-semiconductor-photocatalysts-and-organic-pollutants-for-effective-photocatalytic-degradations
#13
Haixia Tong, Xiaojun Zhan, Xiong Tian, Junhua Li, Dong Qian, Daoxin Wu
In this work, representative semiconductors CdS, V2 O5 , WO3 and P25 (Degussa TiO2 consisting of 80 wt% anatase and 20 wt% rutile) were chosen as the photocatalysts, and the common phenol along with its derivatives (p-nitrophenol, p-chlorophenol and hydroquinone) were designated as the probe pollutants. The energy levels of the frontier molecular orbitals (EHOMO and ELUMO ) of organics, and the valence band (VB) and conduction band (CB) energy levels (EVB and ECB ) of photocatalysts were obtained through experiments and calculations...
May 7, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29751245/paracetamol-toxicity-and-microbial-utilization-pseudomonas-moorei-kb4-as-a-case-study-for-exploring-degradation-pathway
#14
Joanna Żur, Danuta Wojcieszyńska, Katarzyna Hupert-Kocurek, Ariel Marchlewicz, Urszula Guzik
Paracetamol, a widely used analgesic and antipyretic drug, is currently one of the most emerging pollutants worldwide. Besides its wide prevalence in the literature only several bacterial strains able to degrade this compound have been described. In this study, we isolated six new bacterial strains able to remove paracetamol. The isolated strains were identified as the members of Pseudomonas, Bacillus, Acinetobacter and Sphingomonas genera and characterized phenotypically and biochemically using standard methods...
May 3, 2018: Chemosphere
https://www.readbyqxmd.com/read/29748812/assessment-of-reactive-nitrogen-mitigation-potential-of-different-nitrogen-treatments-under-direct-seeded-rice-and-wheat-cropping-system
#15
Jingyan Jiang, Hui Fan, Bingkun Pang, Jingsha Zhang, Zhilin Li, Shanshan Jiang, Jie Wu
The reactive nitrogen (Nr) pollution is a serious environmental problem. A wise application of nitrogen fertilizer is important for mitigating Nr loss. Field experiments were undertaken during the direct-seeded rice and winter-wheat growing seasons from 2014 to 2015 in Nanjing, one of the typical rice-wheat rotation regions in China, to evaluate the potential of different nitrogen fertilizers for mitigating Nr (N2 O, NH3 emissions, and NO3 - leaching) losses. Seven different fertilizer treatments were included in this study: a no fertilizer treatment (NF), conventional fertilizer (CF), urea-ammonium mixed nitrogen fertilizer (UA), stabilized urea (UHD; urea + hydroquinone + dicyandiamide), sulfur-coated urea (SCU), urea formaldehyde (UF) and organic fertilizer (OF)...
May 11, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29734404/effect-of-tert-butyl-hydroquinone-on-bull-semen-cryopreservation
#16
S M H Hussaini, M Zhandi, A Z Shahneh, M Sharafi, A Nejati-Javaremi, A Yousefi, M Emamverdi, M A M M Shehab-El-Deen, F M Pastor
BACKGROUND: Many studies have been shown that freezing induced oxidative stress has detrimental effect on post-thaw sperm quality. OBJECTIVE: This study was conducted to investigate the effect of tert-butyl hydroquinone (tBHQ) on bull semen crtopreservation. MATERIALS AND METHODS: In this study, four different levels of tBHQ [Optidyl containing zero (T0), 2.5 (T2.5), 5 (T5), and 7.5 µM (T7.5) tBHQ] was used to study the effect of tBHQ on freezability of bull semen...
September 2017: Cryo Letters
https://www.readbyqxmd.com/read/29717427/design-of-ag-and-pt-tio-2-sio-2-nanomaterials-for-the-photocatalytic-degradation-of-phenol-under-solar-irradiation
#17
Juan Matos, Biviana Llano, Ricmary Montaña, Po S Poon, Maria C Hidalgo
The design of hybrid mesoporous TiO2 -SiO2 (TS1) materials decorated with Ag and Pt nanoparticles was performed. The photocatalytic degradation of phenol under artificial solar irradiation was studied and the activity and selectivity of the intermediate products were verified. TiO2 -SiO2 was prepared by sol-gel method while Ag- and Pt-based photocatalysts (TS1-Ag and TS1-Pt) were prepared by photodeposition of the noble metals on TS1. Two series of photocatalysts were prepared varying Ag and Pt contents (0...
May 1, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29695092/towards-an-electrochemical-immunosensor-system-with-temperature-control-for-cytokine-detection
#18
Julia Metzner, Katrin Luckert, Karin Lemuth, Martin Hämmerle, Ralf Moos
The cytokine interleukin-13 (IL-13) plays a major role in airway inflammation and is a target of new anti-asthmatic drugs. Hence, IL-13 determination could be interesting in assessing therapy success. Thus, in this work an electrochemical immunosensor for IL-13 was developed and integrated into a fluidic system with temperature control for read-out. Therefore, two sets of results are presented. First, the sensor was set up in sandwich format on single-walled carbon nanotube electrodes and was read out by applying the hydrogen peroxide⁻hydroquinone⁻horseradish peroxidase (HRP) system...
April 24, 2018: Sensors
https://www.readbyqxmd.com/read/29694083/quantum-dynamics-of-h_-2-trapped-within-organic-clathrate-cages
#19
Timothy A Strobel, Anibal J Ramirez-Cuesta, Luke L Daemen, Venkata S Bhadram, Timothy A Jenkins, Craig M Brown, Yongqiang Cheng
The rotational and translational dynamics of molecular hydrogen trapped within β-hydroquinone clathrate (H_{2}@β-HQ)-a practical example of a quantum particle trapped within an anisotropic confining potential-were investigated using inelastic neutron scattering and Raman spectroscopy. High-resolution vibrational spectra, including those collected from the VISION spectrometer at Oak Ridge National Laboratory, indicate relatively strong attractive interaction between guest and host with a strikingly large splitting of rotational energy levels compared with similar guest-host systems...
March 23, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29686400/electrochemical-affinity-biosensors-for-fast-detection-of-gene-specific-methylations-with-no-need-for-bisulfite-and-amplification-treatments
#20
Eloy Povedano, Eva Vargas, Víctor Ruiz-Valdepeñas Montiel, Rebeca M Torrente-Rodríguez, María Pedrero, Rodrigo Barderas, Pablo San Segundo-Acosta, Alberto Peláez-García, Marta Mendiola, David Hardisson, Susana Campuzano, José M Pingarrón
This paper describes two different electrochemical affinity biosensing approaches for the simple, fast and bisulfite and PCR-free quantification of 5-methylated cytosines (5-mC) in DNA using the anti-5-mC antibody as biorecognition element. One of the biosensing approaches used the anti-5-mC as capture bioreceptor and a sandwich type immunoassay, while the other one involved the use of a specific DNA probe and the anti-5-mC as a detector bioreceptor of the captured methylated DNA. Both strategies, named for simplicity in the text as immunosensor and DNA sensor, respectively, were implemented on the surface of magnetic microparticles and the transduction was accomplished by amperometry at screen-printed carbon electrodes by means of the hydrogen peroxide/hydroquinone system...
April 23, 2018: Scientific Reports
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