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https://www.readbyqxmd.com/read/28097924/enhancing-the-performance-of-electro-peroxone-by-incorporation-of-uv-irradiation-and-bdd-anodes
#1
Nasr Bensalah, Ahmed Bedoui
In this work, the treatment of 4-nitrophenol (NP) in water by ozonation, electrolysis, electro-peroxone (EP), and photo-electro-peroxone (PEP) processes was investigated. PEP process is based on the combination of ozonation, UV irradiation, and electrolysis using carbon felt cathode and Boron Doped Diamond (BDD) anode. In this process, H2O2 is electrochemically generated from reduction of O2 in the ozone generator effluent at a carbon felt cathode. The insitu generated H2O2 is simultaneously decomposed by UV- photolysis and by reaction with O3 to form HO(-) radicals that can rapidly and non-selectively oxidize organic pollutants...
January 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28097914/nanostructured-lipid-carriers-nlc-for-the-delivery-of-natural-molecules-with-antimicrobial-activity-production-characterization-and-in-vitro-studies
#2
Rita Cortesi, Giuseppe Valacchi, Ximena M Muresan, Markus Drechsler, Catia Contado, Elisabetta Esposito, Alessandro Grandini, Alessandra Guerrini, Giuseppe Forlani, Gianni Sacchetti
This study describes the preparation, characterization and in vitro activity of nanostructured lipid carriers (NLC) encapsulating natural molecules with antimicrobial activity, such as plumbagin, hydroquinon, eugenol, alpha-asarone and alpha-tocopherol. NLC were prepared by melt and ultrasonication method, characterized by Cryo-TEM for morphology and SdFFF for dimensional distribution and active encapsulation yields. In vitro tests were conducted on bacteria, fungi and human cell cultures. In vitro tests demonstrated that plumbagin is strongly toxic towards F...
January 18, 2017: Journal of Microencapsulation
https://www.readbyqxmd.com/read/28095580/split-face-comparison-of-an-advanced-non-hydroquinone-lightening-solution-to-4-hydroquinone
#3
Joel Schlessinger, Subhash Saxena, Stuart Mohr
INTRODUCTION: Hyperpigmentation is a primary concern for many cosmetic patients because of its high rate of occurrence and significant impact on perceived age. While 4% hydroquinone has been the gold-standard of treatment, there is a growing interest in non-hydroquinone solutions, however, many of these newer solutions fail to deliver equivalent improvement. METHODS: This double-blind, randomized, split-face study compares the effects of a new OTC non-hydroquinone lightening product (JM) to an available 4% hydroquinone lightening solution (OB) on the appearance of hyperpigmentation, texture, and ne lines and wrinkles...
December 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28095579/development-and-clinical-assessment-of-a-comprehensive-product-for-pigmentation-control-in-multiple-ethnic-populations
#4
Elizabeth T Makino, Kuniko Kadoya, Monya L Sigler, Peter D Hino, Rahul C Mehta
BACKGROUND: Pigmentary changes in people of different ethnic origins are controlled by slight variations in key biological pathways leading to different outcomes from the same treatment. It is important to develop and test products for desired outcomes in varying ethnic populations. OBJECTIVES: To develop a comprehensive product (LYT2) that affects all major biological pathways controlling pigmentation and test for clinical efficacy and safety in different ethnic populations...
December 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28095562/the-efficacy-of-q-switched-nd-yag-1064-nm-laser-in-recalcitrant-macular-amyloidosis-a-case-report
#5
Nevil Khurana, Christine Urman
Macular amyloidosis typically presents as small, dusky-brown or greyish pigmented macules, the result of altered keratin deposition. Treatment of these hyperpigmented regions with topical and systemic therapies remains challenging, however Q-Switched neodymi- um-doped yttrium aluminum garnet (ND:YAG) laser has proven to be an effective treatment modality to reduce hyperpigmentation. In this case report we investigated the ef cacy of Q-Switched Nd:YAG laser treatment on a 34-year old woman with recalcitrant macular amyloidosis who failed to respond to over-the-counter bleaching creams...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28095558/clinical-evaluation-of-a-4-hydroquinone-1-retinol-treatment-regimen-for-improving-melasma-and-photodamage-in-fitzpatrick-skin-types-iii-vi
#6
Marta I Rendon, Sylvia Barkovic
The bene ts of monotherapy with hydroquinone for melasma and retinoids for photodamaged skin is well established. Here we report results of a hydroquinone skincare regimen designed for melasma treatment combined with a cosmetic retinol cream on subjects presenting with both melasma and facial photodamage in a 24-week study. Improvement in melasma and photodamage ef cacy pa- rameters of melasma pigmentation intensity and melasma area and severity index (MASI), as well as overall photodamage and mottled hyperpigmentation were found by week 4, the rst post-baseline time point...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28081000/on-the-development-of-a-vipar-nd-radiotherapy-3d-polymer-gel-dosimeter
#7
Marek Kozicki, Malwina Jaszczak, Piotr Maras, Mariusz Dudek, Marian Cłapa
This work presents an improvement of the VIPAR(nd) ('nd' stands for 'normoxic, double', or VIP) polymer gel dosimeter. The gel composition was altered by increasing the concentration of the monomeric components, N-vinylpyrrolidone (NVP) and N,N'-methylenebisacrylamide (MBA), in co-solvent solutions. The optimal composition (VIPAR(CT), where 'CT' stands for computed tomography, or VIC) comprised: 17% NVP, 8% MBA, 12% t-BuOH, 7.5% gelatine, 0.007% ascorbic acid, 0.0008% CuSO4  ×  5H2O and 0.02% hydroquinone...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28071827/lithium-aryloxide-thin-films-with-guest-induced-structural-transformation-by-ald-mld
#8
Mikko Nisula, Jarno Linnera, Antti Karttunen, Maarit Karppinen
Crystalline Li-organic thin films are grown with the atomic/molecular layer deposition (ALD/MLD) technique from lithium hexamethyldisilazide and hydroquinone. The as-deposited films are found to undergo a reversible structural transformation upon exposure to ambient humid air. According to density functional theory calculations, the guest-induced transformation may be related to an unsaturated Li site in the crystal structure.
January 10, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28062359/mechanism-of-synergistic-dna-damage-induced-by-the-hydroquinone-metabolite-of-brominated-phenolic-environmental-pollutants-and-cu-ii-formation-of-dna-cu-complex-and-site-specific-production-of-hydroxyl-radicals
#9
Bo Shao, Li Mao, Na Qu, Ya-Fen Wang, Hui-Ying Gao, Feng Li, Li Qin, Jie Shao, Chun-Hua Huang, Dan Xu, Lin-Na Xie, Chen Shen, Xiang Zhou, Ben-Zhan Zhu
2,6-Dibromohydroquinone (2,6-DBrHQ) has been identified as an reactive metabolite of many brominated phenolic environmental pollutants such as tetrabromobisphenol-A (TBBPA), bromoxynil and 2,4,6-tribromophenol, and was also found as one of disinfection byproducts in drinking water. In this study, we found that the combination of 2,6-DBrHQ and Cu(II) together could induce synergistic DNA damage as measured by double strand breakage in plasmid DNA and 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG) formation, while either of them alone has no effect...
January 3, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28055205/interfacial-solvation-and-surface-ph-of-phenol-and-dihydroxybenzene-aqueous-nanoaerosols-unveiled-by-aerosol-vuv-photoelectron-spectroscopy
#10
Ping-Cheng Lin, Zhong-Hang Wu, Meng-Sin Chen, Yu-Lin Li, Wei-Ren Chen, Tzu-Ping Huang, Yin-Yu Lee, Chia C Wang
While the significance of aqueous interfaces has been recognized in numerous important fields, it can be even more prominent for nanoscaled aqueous aerosols due to their large surface-to-volume ratios and prevalent existence in nature. Also, considering that organic species are often mixed with aqueous aerosols in nature, a fundamental understanding on the electronic and structural properties of organic species in aqueous nanoaerosols is essential to learn the interplay between water and organic solutes under the nanoscaled size regime...
January 5, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28052295/in-vitro-dermal-absorption-of-hydroquinone-protocol-validation-and-applicability-on-illegal-skin-whitening-cosmetics
#11
Bart Desmedt, Gamze Ates, Patricia Courselle, Jacques O De Beer, Vera Rogiers, Benoit Hendrickx, Eric Deconinck, Kristien De Paepe
In Europe, hydroquinone is a forbidden cosmetic ingredient. It is, however, still abundantly used because of its effective skin-whitening properties. The question arises as to whether the quantities of hydroquinone used become systemically available and may cause damage to human health. Dermal absorption studies can provide this information. In the EU, dermal absorption has to be assessed in vitro since the Cosmetic Regulation 1223/2009/EC forbids the use of animals. To obtain human-relevant data, a Franz diffusion cell protocol was validated using human skin...
January 5, 2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28040900/theoretical-study-on-reaction-pathways-leading-to-co-and-co2-in-the-pyrolysis-of-resorcinol
#12
Yuki Furutani, Shinji Kudo, Jun-Ichiro Hayashi, Koyo Norinaga
Possible pathways for the pyrolysis of resorcinol with the formation of CO and CO2 as final products were proposed and evaluated using ab initio calculations. Our experimental study revealed that large quantities of CO2 are generated in the pyrolysis of 1,3-dihydroxybenzene (resorcinol), while the pyrolysis of the dihydroxybenzene isomers 1,2-dihydroxybenzene (catechol) and 1,4-dihydroxybenzene (hydroquinone) produces little CO2. The fate of oxygen atoms in catechol and hydroquinone was essentially the formation of CO...
January 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28031346/insecticidal-activity-of-thymoquinone-and-related-compounds-against-culex-quinquefasciatus-diptera-culicidae
#13
Mariah L Scott, Mary F Adams, Joseph J Karchesy, Janet C McAllister
Insecticides based on botanical sources have taken on increased attention due to differing modes of action from current insecticides in use and the view that they may be environmentally friendly. Thymoquinone, a component in the essential oil of incense cedar heartwood, has been shown to have insecticidal action against adult mosquitoes. This study evaluated relative toxicities of thymoquinone, selected derivatives of thymoquinone, hydroquinone, and arbutin to determine if any had similar or better activity...
December 28, 2016: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28028588/microscope-assisted-uv-initiated-preparation-of-well-defined-porous-polymer-monolithic-plugs-in-glass-microchips-for-peptide-preconcentration
#14
Szymon Dziomba, Monica Araya-Farias, Myriam Taverna, Mohamed Guerrouache, Benjamin Carbonnier, N Thuy Tran
Herein, highly defined monolithic beds were prepared in glass microchips by photopolymerization of ethylene glycol methacrylate phosphate (EGMP), acrylamide, and N,N'-methylenebisacrylamide (BAA) using an epifluorescence microscope as UV-irradiation source. Such a fast and easy method allowed precise control of (i) the edge shape, (ii) the location along the microchannel, and (iii) the length of the monolithic plugs within glass microchips. The addition of hydroquinone, a polymerization inhibitor, to the prepolymerization mixture was beneficial for achieving local and robust incorporation of monoliths with sharp edges within microchannels...
December 27, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28004568/multicopper-laccase-mimicking-nanozymes-with-nucleotides-as-ligands
#15
Hao Liang, Feifei Lin, Zijie Zhang, Biwu Liu, Shuhui Jiang, Qipeng Yuan, Juewen Liu
Using nanomaterials to achieve functional enzyme mimics (nanozymes) is attractive for both applied and fundamental research. Laccases are multicopper oxidases highly important for biotechnology and environmental remediation. In this work, we report an exceptionally simple yet functional laccase mimic based on guanosine monophosphate (GMP) coordinated copper. It forms an amorphous metal-organic framework (MOF) material. The ratio of copper and GMP is 3:4 as determined by isothermal titration calorimetry. It has excellent laccase-like activity and converts a diverse range of phenol containing substrates such as hydroquinone, naphthol, catechol and epinephrine...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28004097/electro-catalytic-oxidation-of-catechol-at-poly-1-amino-9-10-anthraquinone-sds-composite-film
#16
Hossein Nikoofard, Malihe Solbi
An electro-chemically active composite film containing the environmentally friendly surfactant sodium dodecyl sulfate (SDS) and poly(1-amino-9,10-anthraquinone) (PAAQ) is used as an electron transfer mediator in the electro-chemical oxidation of catechol. Compared with the bare platinum (Pt) electrode, the Pt/PAAQ-SDS modified electrode remarkably lowers the anodic peak potential of catechol, and increases the peak currents. The results obtained indicate that the activation energy for the electro-chemical oxidation of catechol at the polymer film is low (7...
December 2016: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28003630/in-vitro-evaluation-of-the-biocompatibility-of-newly-synthesized-bis-quaternary-ammonium-compounds-with-spacer-structures-derived-from-pentaerythritol-or-hydroquinone
#17
Masashi Yamamoto, Takashi Takami, Reiko Matsumura, Alexander Dorofeev, Yoshihiko Hirata, Hideaki Nagamune
 With the object of developing new biocides milder for human use than the current antiseptics, we synthesized a series of bis-quaternary ammonium compounds (bis-QACs). The antimicrobial activity of the newly synthesized bis-QACs and common biocides used as antiseptics was compared by examining minimum inhibitory concentrations and minimum bactericidal concentrations (MBCs). Moreover, the cytotoxicity of these compounds against human cells was determined to calculate the biocompatibility index (BI) of these compounds...
2016: Biocontrol Science
https://www.readbyqxmd.com/read/27998787/formation-and-reactivity-of-inorganic-and-organic-chloramines-and-bromamines-during-oxidative-water-treatment
#18
Michèle B Heeb, Ina Kristiana, Daniela Trogolo, J Samuel Arey, Urs von Gunten
The formation and further reactions of halamines during oxidative water treatment can be relevant for water quality. In this study, we investigated the formation and reactivity of several inorganic and organic halamines (monochloramine, N-chloromethylamine, N-chlorodimethylamine, monobromamine, dibromamine, N-bromomethylamine, N,N-dibromomethylamine, and N-bromodimethylamine) by kinetic experiments, transformation product analysis, and quantum chemical computations. Kinetic model simulations were conducted to evaluate the relevance of halamines for various water treatment scenarios...
November 30, 2016: Water Research
https://www.readbyqxmd.com/read/27998090/monitoring-chemical-and-biological-electron-transfer-reactions-with-a-fluorogenic-vitamin-k-analogue-probe
#19
Mei-Ni Belzile, Robert Godin, Andrés M Durantini, Gonzalo Cosa
We report herein the design, synthesis, and characterization of a two-segment fluorogenic analogue of vitamin K, B-VKQ, prepared by coupling vitamin K3, also known as menadione (a quinone redox center), to a boron-dipyrromethene (BODIPY) fluorophore (a lipophilic reporter segment). Oxidation-reduction reactions, spectroelectrochemical studies, and enzymatic assays conducted in the presence of DT-diaphorase illustrate that the new probe shows reversible redox behavior on par with that of vitamin K, provides a high-sensitivity fluorescence signal, and is compatible with biological conditions, opening the door to monitor remotely (i...
December 21, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27993056/development-of-redox-active-flow-electrodes-for-high-performance-capacitive-deionization
#20
Jinxing Ma, Di He, Wangwang Tang, Peter Kovalsky, Calvin He, Changyong Zhang, T David Waite
An innovative flow electrode comprising redox-active quinones to enhance the effectiveness of water desalination using flow-electrode capacitive deionization (FCDI) is described in this study. The results show that, in addition to carbon particle contact, the presence of the aqueous hydroquinone (H2Q)/benzoquinone (Q) couple in a flowing suspension of carbon particles enhances charge transfer significantly as a result of reversible redox reactions of H2Q/Q. Ion migration through the micropores of the flow electrodes was facilitated in particular with the desalination rate significantly enhanced...
December 20, 2016: Environmental Science & Technology
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