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hydroquinone

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https://www.readbyqxmd.com/read/28236333/on-the-way-to-a-trisanionic-cu3o2-core-for-oxidase-catalysis-evidence-of-an-asymmetric-trinuclear-precursor-stabilised-by-perfluoropinacolate-ligands
#1
Steven F Hannigan, Amanda I Arnoff, Sarah E Neville, June S Lum, James A Golen, Arnold L Rheingold, Nicole Orth, Ivana Ivanović-Burmazović, Patricia Liebhäuser, Thomas Rösener, Julia Stanek, Alexander Hoffmann, Sonja Herres-Pawlis, Linda H Doerrer
Cu(I) complexes of the form A[(R3P)Cu(pinF)] were synthesized and characterized, in which (pinF)2- is the bidentate, oxygen-donating, ligand perfluoropinacolate. Low temperature oxygenation of the A[(R3P)Cu(pinF)] species resulted in a trisanionic bis(μ3-oxo) trinuclear Cu(II,II,III) core that was characterized by UV-vis spectroscopy (λmax, nm (ε, M-1 cm-1)) = (330, 535 (19), 630 (33)), cryospray-ionization mass spectrometry (CSI-MS), and X-band electron paramagnetic resonance (EPR) spectroscopy (derivative resonance at 3300 G, Δms = 2 at 1500 G)...
February 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28215095/ph-dependence-of-photoinduced-electron-transfer-with-ru-tap-3-2
#2
Ludovic Troian-Gautier, Epiphanie Mugeniwabagara, Luca Fusaro, Cécile Moucheron, Andrée Kirsch-De Mesmaeker, Michel Luhmer
The quenching of the excited state of [Ru(TAP)3](2+) (TAP = 1,4,5,8-tetraazaphenanthrene) by guanosine-5'-monophosphate (GMP), N-acetyltyrosine (N-Ac-Tyr), and hydroquinone (H2Q) has been studied in aqueous solution over a wide range of pH values including, for the first time, strongly acidic media. This quenching by electron transfer was examined by steady-state (1)H photochemically induced dynamic nuclear polarization (photo-CIDNP) as well as by more conventional techniques, among which are pulsed laser-induced transient absorption and emission experiments...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28212932/purification-and-characterisation-of-a-pronase-inducible-lectin-isolated-from-human-serum
#3
Beulaja Manikandan, Manikandan Ramar, Thiagarajan Raman, Mullainadhan Periasamy, Arumugam Munusamy
A new lectin was purified to electrophoretic homogeneity from pronase treated human serum by a single-step of affinity chromatography on concanavalin A-Sepharose 4B. The isolated lectin agglutinated five types of vertebrate RBC, with highest titer against hen RBC. This activity was independent of divalent cations, insensitive to EDTA and specific to mannosamine, glucosamine as well as galactosamine. This lectin gave a single symmetrical peak in its native form with a molecular mass estimate of 6kDa in FPLC analysis and 6...
February 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28211691/lipophilized-grape-seed-proanthocyanidin-derivatives-as-novel-antioxidants
#4
Mingshun Chen, Shujuan Yu
Grape seed proanthocyanidin (GSP) is a natural food antioxidant. Natural proanthocyanidins (PC) in grape seed are usually polyhydroxy derivatives which exhibit hydrophilic character. GSP was modified structurally to improve its lipophilicity, expand its application in lipophilic media, and enhance its cellular absorption in vivo. Esterification of the water-soluble GSP was prepared by immobilized lipase Lipozyme TL IM with lauric acid, and their enhanced lipophilicity was confirmed by the 1-octanol/water partition coefficient...
February 17, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28208259/ultrasensitive-electrochemical-detection-of-mirna-21-using-a-zinc-finger-protein-specific-to-dna-rna-hybrids
#5
Chiew San Fang, Kwang-Sun Kim, Byeongjun Yu, Sangyong Jon, Moon-Soo Kim, Haesik Yang
Both high sensitivity and high specificity are crucial for detection of miRNAs that have emerged as important clinical biomarkers. Just Another Zinc finger proteins (JAZ, ZNF346) bind preferably (but nonsequence-specifically) to DNA-RNA hybrids over single-stranded RNAs, single-stranded DNAs, and double-stranded DNAs. We present an ultrasensitive and highly specific electrochemical method for miRNA-21 detection based on the selective binding of JAZ to the DNA-RNA hybrid formed between a DNA capture probe and a target miRNA-21...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28198593/electrochemical-behavior-of-pedot-lignin-in-ionic-liquid-electrolytes-suitable-cathode-electrolyte-system-for-sodium-batteries
#6
Nerea Casado, Matthias Hilder, Cristina Pozo-Gonzalo, Maria Forsyth, David Mecerreyes
Biomass derived polymers, such as lignin, contain redox quinone/hydroquinone redox moieties that can be used to store charge. Composites based on the biopolymer lignin and several conjugated polymers have shown good charge storage properties. However, their performance has been just studied in acidic aqueous media limiting the applications mainly to supercapacitors. Here we show that PEDOT/Lignin biopolymers are electroactive in aprotic ionic liquids and we move a step further by assembling sodium full cell batteries using PEDOT/Lignin as electrode material and ionic liquid electrolytes...
February 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28197572/three-in-one-prototropy-free-highly-stable-aadd-type-self-complementary-quadruple-hydrogen-bonded-molecular-duplexes-with-a-built-in-fluorophore
#7
Sanjeev Kheria, Suresh Rayavarapu, Amol S Kotmale, Gangadhar J Sanjayan
This communication reports an effective approach for addressing the prototropy-related problems in heterocycle-based AADD-type self-assembling systems by freezing their hydrogen-bonding codes, by utilizing intramolecular bifurcated hydrogen bonding interactions. Using this strategy, we have also developed a hydroquinone-conjugated AADD-type self-assembling system adorned with three valuable features such as prototropy-free dimerization yielding single duplexes, high duplex stability and a built-in fluorophore, which would augment its application potential...
February 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28195202/application-of-pristine-and-doped-sno2-nanoparticles-as-a-matrix-for-agro-hazardous-material-organophosphate-detection
#8
Naushad Khan, Taimur Athar, H Fouad, Ahmad Umar, Z A Ansari, S G Ansari
With an increasing focus on applied research, series of single/composite materials are being investigated for device development to detect several hazardous, dangerous, and toxic molecules. Here, we report a preliminary attempt of an electrochemical sensor fabricated using pristine Ni and Cr-doped nano tin oxide material (SnO2) as a tool to detect agro-hazardous material, i.e. Organophosphate (OP, chlorpyrifos). The nanomaterial was synthesized using the solution method. Nickel and chromium were used as dopant during synthesis...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28194803/the-current-spectrum-of-contact-sensitization-in-patients-with-chronic-leg-ulcers-or-stasis-dermatitis%C3%A2-%C3%A2-new-data-from-the-information-network-of-departments-of-dermatology-ivdk
#9
Cornelia Erfurt-Berge, Johannes Geier, Vera Mahler
BACKGROUND: Patients with lower leg dermatitis, chronic venous insufficiency or chronic leg ulcers have a high prevalence of contact sensitization. OBJECTIVES: To identify the current spectrum of contact allergens in these patients. PATIENTS AND METHODS: Data of the Information Network of Departments of Dermatology on 5264 patients with the above diagnoses from the years 2003 to 2014 (study group) were compared with data on 4881 corresponding patients from 1994 to 2003 (historical control group) and with a current control group without these diagnoses (n = 55 510)...
February 14, 2017: Contact Dermatitis
https://www.readbyqxmd.com/read/28193070/toward-liquid-biopsy-determination-of-the-humoral-immune-response-in-cancer-patients-using-halotag-fusion-protein-modified-electrochemical-bioplatforms
#10
María Garranzo-Asensio, Ana Guzman-Aranguez, Carmen Povés, María Jesús Fernández-Aceñero, Rebeca M Torrente-Rodríguez, Víctor Ruiz-Valdepeñas Montiel, Gemma Domínguez, Luis San Frutos, Nuria Rodríguez, Mayte Villalba, José M Pingarrón, Susana Campuzano, Rodrigo Barderas
Autoantibodies raised against tumor-associated antigens have shown high promise as clinical biomarkers for reliable diagnosis, prognosis, and therapy monitoring of cancer. An electrochemical disposable biosensor for the specific and sensitive determination of p53-specific autoantibodies has been developed for the first time in this work. This biosensor involves the use of magnetic microcarriers (MBs) modified with covalently immobilized HaloTag fusion p53 protein as solid supports for the selective capture of specific autoantibodies...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28170232/contaminant-removal-from-source-waters-using-cathodic-electrochemical-membrane-filtration-mechanisms-and-implications
#11
Junjian Zheng, Jinxing Ma, Zhiwei Wang, Shaoping Xu, T David Waite, Zhichao Wu
Removal of recalcitrant anthropogenic contaminants from water calls for the development of cost-effective treatment technologies. In this work, a novel electrochemical membrane filtration (EMF) process using a conducting microfiltration membrane as the cathode has been developed and the degradation of sulphanilic acid (SA) examined. The electrochemical degradation of SA in flow-by mode followed pseudo-first-order kinetics with the degradation rate enhanced with increase in charging voltage. Hydrogen peroxide as well as oxidants such as HO• and Fe(IV)O2+ were generated electrochemically with HO• found to be the dominant oxidant responsible for SA degradation...
February 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28165331/synthesis-characterization-and-electrochemical-properties-of-5-aza-5-helicene-ch2o-co-mwcnts-nanocomposite
#12
Francesca Fontana, Federica Melone, Daniela Iannazzo, Salvatore Leonardi, Giovanni Neri
In this study, we report the preparation of a novel nanocomposite, 5-aza[5]helicene-CH2O-CO-MWCNTs, obtained grafting the 5-aza[5]helicene moiety on the surface of multiwalled carbon nanotubes. TGA, FTIR, UV and PL measurements provided evidences that the organic moiety is covalently grafted to the MWCNTs. The 5-aza[5]helicene-CH2O-CO-MWCNTs nanocomposite was utilized to fabricate modified commercial screen printed carbon electrodes (SPCEs). Its electrochemical behavior was studied in neutral buffer solution in the presence of ferricyanide and hydroquinone (HQ)...
February 6, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28165019/fungal-endophyte-derived-fritillaria-unibracteata-var-wabuensis-diversity-antioxidant-capacities-in-vitro-and-relations-to-phenolic-flavonoid-or-saponin-compounds
#13
Feng Pan, Tian-Jiao Su, Shi-Mei Cai, Wei Wu
Diverse fungal endophytes are rich fungal resources for the production of an enormous quantity of natural products. In the present study, 53 fungal endophytes were isolated from the bulbs of Fritillaria unibracteata var. wabuensis (FUW). Of these, 49 strains were identified and grouped into 17 different taxa, and priority was conferred to the Fusarium genus. All fungal fermented filtrates displayed antioxidant activities. The DPPH activity, total antioxidant capacities (ABTS), reduction power (FRAP), total phenolic content (TPC), total flavonoid content (TFC) and total saponin content (TSC) were evaluated using petroleum ether, ethyl acetate, n-butyl alcohol and ethanol fractions extracted from five representative fungal cultures...
February 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28161548/anti-melasma-codrug-of-retinoic-acid-assists-cutaneous-absorption-with-attenuated-skin-irritation
#14
Pei-Wen Hsieh, Chi-Feng Hung, Chih-Hung Lin, Chang-Wei Huang, Jia-You Fang
Melasma treatment with combined retinoic acid (RA) and hydroquinone (HQ) usually causes unsatisfactory outcomes and safety concerns. This study attempted to evaluate the cutaneous absorption and skin tolerance of the codrug conjugated with RA and HQ via ester linkage. The codrug's permeation of the pig skin was estimated using Franz diffusion cell. The codrug and parent drugs were comparatively examined for anti-inflammatory activity and tyrosinase inhibition. In vivo cutaneous irritation was assessed on nude mouse skin...
February 1, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28159106/electrochemical-immunosensor-for-simultaneous-determination-of-interleukin-1-beta-and-tumor-necrosis-factor-alpha-in-serum-and-saliva-using-dual-screen-printed-electrodes-modified-with-functionalized-double-walled-carbon-nanotubes
#15
E Sánchez-Tirado, C Salvo, A González-Cortés, P Yáñez-Sedeño, F Langa, J M Pingarrón
Dual screen-printed carbon electrodes modified with 4-carboxyphenyl-functionalized double-walled carbon nanotubes (HOOC-Phe-DWCNTs/SPCEs) have been used as scaffolds for the preparation of electrochemical immunosensors for the simultaneous determination of the cytokines Interleukin-1β (IL-1β) and factor necrosis tumor α (TNF-α). IL-1β. Capture antibodies were immobilized onto HOOC-Phe-DWCNTs/SPCEs in an oriented form making using the commercial polymeric coating Mix&Go™. Sandwich type immunoassays with amperometric signal amplification through the use of poly-HRP-streptavidin conjugates and H2O2 as HRP substrate and hydroquinone as redox mediator were implemented...
March 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28137511/neuroprotection-and-reduced-gliosis-by-pre-and-post-treatments-of-hydroquinone-in-a-gerbil-model-of-transient-cerebral-ischemia
#16
Joon Ha Park, Chan Woo Park, Ji Hyeon Ahn, Soo Young Choi, Myoung Cheol Shin, Jun Hwi Cho, Tae-Kyeong Lee, In Hye Kim, Jeong Hwi Cho, Jae-Chul Lee, Yang Hee Kim, Young-Myeong Kim, Jong-Dai Kim, Hyun-Jin Tae, Bich Na Shin, Eun Joo Bae, Bai Hui Chen, Moo-Ho Won, Il Jun Kang
Hydroquinone (HQ), a major metabolite of benzene, exists in many plant-derived food and products. Although many studies have addressed biological properties of HQ including the regulation of immune responses and antioxidant activity, neuroprotective effects of HQ following ischemic insults have not yet been considered. Therefore, in this study, we examined neuroprotective effects of HQ against ischemic damage in the gerbil hippocampal cornu ammonis 1 (CA1) region following 5 min of transient cerebral ischemia...
January 27, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28128552/rapid-selective-circumneutral-degradation-of-phenolic-pollutants-using-peroxymonosulfate-iodide-metal-free-oxidation-role-of-iodine-atoms
#17
Yong Feng, Po-Heng Lee, Deli Wu, Kaimin Shih
The development of environmentally friendly, oxidation-selective advanced oxidation processes (AOPs) for water decontamination is important for resource recovery, carbon dioxide abatement, and cost savings. In this study, we developed an innovative AOP using a combination of peroxymonosulfate (PMS) and iodide ions (I(-)) for the selective removal of phenolic pollutants from aqueous solutions. The results showed that nearly 100% degradation of phenol, bisphenol A, and hydroquinone was achieved after reaction for 4 min in the presence of 65 μM PMS and 50 μM I(-)...
February 10, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28118088/antimicrobial-and-antiradical-activity-of-extracts-obtained-from-leaves-of-five-species-of-the-genus-bergenia-identification-of-antimicrobial-compounds
#18
Beata Żbikowska, Roman Franiczek, Alina Sowa, Grażyna Połukord, Barbara Krzyżanowska, Zbigniew Sroka
An important focus of modern medicine is the search for new substances and strategies to combat infectious diseases, which present an increasing threat due to the growth of bacterial resistance to antibiotics. Another problem concerns free radicals, which in excess can cause several serious diseases. An alternative to chemical synthesis of antimicrobial and antiradical compounds is to find active substances in plant raw materials. We prepared extracts from leaves of five species of the genus Bergenia: B. purpurascens, B...
January 24, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28114204/treatment-of-postinflammatory-hyperpigmentation-with-a-combination-of-glycolic-acid-peels-and-a-topical-regimen-in-dark-skinned-patients-a-comparative-study
#19
Rashmi Sarkar, Nisha V Parmar, Sheilly Kapoor
BACKGROUND: Facial postinflammatory hyperpigmentation (PIH) is challenging to manage in patients with skin of color because of the risk of subsequent treatment-related hyperpigmentation. OBJECTIVE: To evaluate the safety and efficacy of combining glycolic acid (GA) peels with a modified Kligman formula (MKF) containing hydroquinone 2%, tretinoin 0.05%, and hydrocortisone 1% for the treatment of facial PIH in Indian patients. METHODS: Thirty Indian patients (Fitzpatrick skin Types III-V) with facial PIH were randomly assigned to 2 groups of 15 each...
January 20, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28111822/dimensionally-controlled-assembly-of-an-external-stimuli-responsive-co2fe2-complex-into-supramolecular-hydrogen-bonded-networks
#20
Yoshihiro Sekine, Masayuki Nihei, Hiroki Oshio
A stimuli-responsive tetranuclear complex was assembled into new aggregates with controllable dimensionality through directional hydrogen bonds (HBs). A cyanide-bridged tetranuclear complex cation, [Co2Fe2(CN)6(tp*)2(bpy*)4]2+ (abbreviated to 12+) (tp* = hydrotris(3,5-dimethylpyrazol-1-yl)borate and bpy* = 4,4'-di-methyl-2,2'-bipyridine) has two terminal cyanide nitrogens and acts as a hydrogen bond acceptor (HBA) with a linear bridging mode. Co-crystallization of 12+ with p-hydroquinone (H2Q), a hydrogen bond donor (HBD) with two donor sites, led to a one-dimensional aggregate, 1(BPh4)2∙(H2Q)∙2H2O (2), while a two-dimensional sheet with a honeycomb structure, 13(PF6)6∙(H3PG)2∙4CH3CN∙8H2O (3), was obtained by co-crystallization with phloroglucinol (H3PG) acting as a three-way structure-directing HBD...
January 23, 2017: Chemistry: a European Journal
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