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Journal articles on the topic 'Hydroquinone stability'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Trefz, Tyler, Md Khayrul Kabir, Rajsapan Jain, Brian O. Patrick, and Robin G. Hicks. "Unconventional redox properties of hydroquinones with intramolecular OH−N hydrogen bonds." Canadian Journal of Chemistry 92, no. 10 (2014): 1010–20. http://dx.doi.org/10.1139/cjc-2014-0175.

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The redox (chemical and electrochemical) properties of several hydroquinones are reported in which the OH protons are engaged in intramolecular hydrogen bonds to a nitrogen-based acceptor (pyridine or amine). The 1,4-hydroquinones generally undergo reversible oxidation to quinones in which both OH protons have transferred to the pendant bases; the oxidation processes are generally chemically and electrochemically reversible, in stark contrast with normal hydroquinones, which are oxidized irreversibly (via proton loss) to quinones. The oxidation processes, believed to occur in concerted proton/

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2

Yang, Xian, Sergio Garcia, Tobias Janoschka, Dénes Kónya, Martin Hager, and Ulrich Schubert. "Novel, Stable Catholyte for Aqueous Organic Redox Flow Batteries: Symmetric Cell Study of Hydroquinones with High Accessible Capacity." Molecules 26, no. 13 (2021): 3823. http://dx.doi.org/10.3390/molecules26133823.

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Owing to their broad range of redox potential, quinones/hydroquinones can be utilized for energy storage in redox flow batteries. In terms of stability, organic catholytes are more challenging than anolytes. The two-electron transfer feature adds value when building all-quinone flow battery systems. However, the dimerization of quinones/hydroquinones usually makes it difficult to achieve a full two-electron transfer in practical redox flow battery applications. In this work, we designed and synthesized four new hydroquinone derivatives bearing morpholinomethylene and/or methyl groups in differ

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3

Abbas, Samah S., Mohamed R. Elghobashy, Lories I. Bebawy, and Rafeek F. Shokry. "Stability-indicating chromatographic determination of hydroquinone in combination with tretinoin and fluocinolone acetonide in pharmaceutical formulations with a photodegradation kinetic study." RSC Advances 5, no. 54 (2015): 43178–94. http://dx.doi.org/10.1039/c5ra07083j.

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4

Jia, Yuanyuan, Alfred Kleinhammes, Harsha Kulkarni, Kristopher McGuire, L. E. McNeil, and Yue Wu. "Synthesis and Characterization of TiO2 Nanotube/Hydroquinone Hybrid Structure." Journal of Nanoscience and Nanotechnology 7, no. 2 (2007): 458–62. http://dx.doi.org/10.1166/jnn.2007.132.

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It is shown that 1,4-benzenediol (hydroquinone) and TiO2 nanotubes can form a hybrid structure that is stable in aqueous environment. The incorporation of hydroquinone restores the local structure of nanotubes to anatase-like as evidenced by Raman spectroscopy. Subtle overall structural changes take place upon annealing of the hybrid structure contributing to its stability. The hybrid system shows a broad optical absorption peak extending significantly beyond 700 nm with potential applications in photocatalysis and photoelectrochemistry.

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5

Bensacia, Nabila, Saâd Moulay, François Garin, Ioana Fechete, and Anne Boos. "Effect of Grafted Hydroquinone on the Acid-Base Properties of Poly(acrylic acid) in the Presence of Copper (II)." Journal of Chemistry 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/913987.

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Potentiometric titration of poly(acrylic acid) and hydroquinone-functionalized poly(acrylic acid) was conducted in the presence of copper (II). The effects of hydroquinone functionalizing and copper (II) complexing on the potentiometric titration of poly(acrylic acid) were studied in an ionic environment and in its absence. Henderson-Hasselbalch equation was applied to assess its validity for this titration. Coordination number and the stability constants of the copper- (II-)complexed polymers were determined, and results showed the formation of mostly monodentate and bidentate copper- (II-)po

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6

Lu, Jian-Yu, Yu-Sheng Yu, Tung-Bo Chen, et al. "Fabrication of an Extremely Cheap Poly(3,4-ethylenedioxythiophene) Modified Pencil Lead Electrode for Effective Hydroquinone Sensing." Polymers 13, no. 3 (2021): 343. http://dx.doi.org/10.3390/polym13030343.

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Hydroquinone (HQ) is one of the major deleterious metabolites of benzene in the human body, which has been implicated to cause various human diseases. In order to fabricate a feasible sensor for the accurate detection of HQ, we attempted to electrochemically modify a piece of common 2B pencil lead (PL) with the conductive poly(3,4-ethylenedioxythiophene) or PEDOT film to construct a PEDOT/PL electrode. We then examined the performance of PEDOT/PL in the detection of hydroquinone with different voltammetry methods. Our results have demonstrated that PEDOT film was able to dramatically enhance t

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7

Muloogi, Derick, Irene Nalumansi, and Denis Byamugisha. "Levels of Hydroquinone, Selected Heavy Metals (Hg, Pb, As) and Chemical requirements in Some Skin Lightening Creams Sold in Mbarara Municipality." European Journal of Physical Sciences 4, no. 1 (2021): 15–34. http://dx.doi.org/10.47672/ejps.748.

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In this study, Skin-lightening creams commonly sold in Mbarara municipality were analyzed for chemical parameters (pH, thermal stability and fatty substance content), total hydroquinone, Lead, Mercury, and Arsenic contents. Total heavy metal content was determined by atomic absorption spectrophotometry. The levels of hydroquinone were determined using High Performance liquid chromatography (HPLC). All the creams showed detectable mean levels of mercury, ranging from 0.07±0.01ppm to 0.33±0.01ppm. Only 26.31% of the creams showed detectable levels of lead and 15.79% creams recorded detectable le

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8

PUEYO, José J., Paul G. CURLEY, and Stephen G. MAYHEW. "Kinetics and thermodynamics of the binding of riboflavin, riboflavin 5′-phosphate and riboflavin 3′,5′-bisphosphate by apoflavodoxins." Biochemical Journal 313, no. 3 (1996): 855–61. http://dx.doi.org/10.1042/bj3130855.

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The reactions of excess apoflavodoxin from Desulfovibrio vulgaris, Anabaena variabilis and Azotobacter vinelandii with riboflavin 5´-phosphate (FMN), riboflavin 3´,5´-bisphosphate and riboflavin are pseudo-first-order. The rates increase with decreasing pH in the range pH 5–8, and, in general, they increase with increasing ionic strength to approach a maximum at an ionic strength greater than 0.4 M. The rate of FMN binding in phosphate at high pH increases to a maximum at an ionic strength of about 0.1 M, and then decreases as the phosphate concentration is increased further. The dissociation

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9

Kirkwood, Kathleen, and S. David Jackson. "Hydrogenation and Hydrodeoxygenation of Oxygen-Substituted Aromatics over Rh/silica: Catechol, Resorcinol and Hydroquinone." Catalysts 10, no. 5 (2020): 584. http://dx.doi.org/10.3390/catal10050584.

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The hydrogenation and hydrodeoxygenation (HDO) of dihydroxybenzene isomers, catechol (1,2-dihydroxybenzene), resorcinol (1,3-dihydroxybenzene) and hydroquinone (1,4-dihydroxybenzene) was studied in the liquid phase over a Rh/silica catalyst at 303–343 K and 3 barg hydrogen pressure. The following order of reactivity, resorcinol > catechol > hydroquinone (meta > ortho > para) was obtained. Kinetic analysis revealed that catechol had a negative order of reaction whereas both hydroquinone and resorcinol gave positive half-order suggesting that catechol is more strongly adsorbed. Activ

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10

Smiles, Kenneth A., Kelly K. Dong, Matthew T. Canning, Roger Grimson, Alan M. Walfield, and Daniel B. Yarosh. "A hydroquinone formulation with increased stability and decreased potential for irritation." Journal of Cosmetic Dermatology 6, no. 2 (2007): 83–88. http://dx.doi.org/10.1111/j.1473-2165.2007.00301.x.

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11

Ghanbarzadeh, Saeed, Reza Hariri, Maryam Kouhsoltani, Javad Shokri, Yousef Javadzadeh, and Hamed Hamishehkar. "Enhanced stability and dermal delivery of hydroquinone using solid lipid nanoparticles." Colloids and Surfaces B: Biointerfaces 136 (December 2015): 1004–10. http://dx.doi.org/10.1016/j.colsurfb.2015.10.041.

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12

Faskhutdinova, I. I., A. S. Mikhailov, and B. I. Shapiro. "DEVELOPMENT OF A METHOD FOR THE SYNTHESIS OF PLASMONIC GOLD NANOPARTICLES FOR A WIDE SPECTRAL REGION 520-720 nm." Fine Chemical Technologies 12, no. 5 (2017): 56–64. http://dx.doi.org/10.32362/2410-6593-2017-12-5-56-64.

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A method of the synthesis of plasmon gold nanoparticles by the reduction of HAuCl4 with organic reductants, such as formalin, sodium citrate and hydroquinone has been studied. It is shown that, depending on the concentration of the reagents, the temperature of synthesis and the type of the reducing agent, the position of the maximum of the plasmon band varies in a wide range from 520 nm to 720 nm. A one-stage method using hydroquinone as a reducing agent for the synthesis of long-wave plasmonic gold nanoparticles that form agglomerates of smaller particles with a plasmon absorption band in the

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13

Obradovic, Mirjana, Snezana Mitic, Snezana Tosic, and A. N. Pavlovic. "Spectrophotometric investigation of the Fe(III)-disulphonate hydroquinone complex." Journal of the Serbian Chemical Society 70, no. 4 (2005): 651–59. http://dx.doi.org/10.2298/jsc0504651o.

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Iron(III) form an indigo-blue complex with the disulphonated product of hydroquinone (K2S2Hy) in acid media with an absorption maxima at 600 nm. The time stability of the complex, dependence of the complex absorbance on pH and the influence of temperature and solvent were followed on the basis of spectrophotometric measurements. Using the Job, mole ratio and Henry?Franck?Ostwald methods, the composition and relative stability constant of this complex, in 80 vol.% ethanol as solvent, were determined (1:1;log??293 = 3.37). A new spectrophotometric method for the determination of iron has been de

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14

Wu, Pey-Shiuan, Chih-Hung Lin, Yi-Ching Kuo, and Chih-Chien Lin. "Formulation and Characterization of Hydroquinone Nanostructured Lipid Carriers by Homogenization Emulsification Method." Journal of Nanomaterials 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/3282693.

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Nanostructured lipid carrier (NLC) was prepared by homogenization emulsification method and improved with modified surfactants. The properties of nanoparticles were investigated using the NLC system for hydroquinone (HQ) as a model drug and by increasing the light stability of hydroquinone. The optimized condition of NLC in stirring was 1200 rpm, the homogenized speed was 8000 rpm, solid oil to liquid oil ratio was 3 : 7, and lecithin to surfactant ratio was 3 : 1. The particle size was 393.30±28.23 nm and the encapsulation efficiency was 22.13±2.66%. The zeta-potential of HQ-NLC was better th

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15

Xin, Jia-Ying, Li-Rui Sun, Hui-Ying Lin, Shuai Zhang, and Chun-Gu Xia. "Hybridization of Particulate Methane Monooxygenase by Methanobactin-Modified AuNPs." Molecules 24, no. 22 (2019): 4027. http://dx.doi.org/10.3390/molecules24224027.

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Particulate methane monooxygenase (pMMO) is a characteristic membrane-bound metalloenzyme of methane-oxidizing bacteria that can catalyze the bioconversion of methane to methanol. However, in order to achieve pMMO-based continuous methane-to-methanol bioconversion, the problems of reducing power in vitro regeneration and pMMO stability need to be overcome. Methanobactin (Mb) is a small copper-chelating molecule that functions not only as electron carrier for pMMO catalysis and pMMO protector against oxygen radicals, but also as an agent for copper acquisition and uptake. In order to improve th

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16

Azizi, Maliheh, Fatemeh Fazeli, Mehrdad Mohammadi, and Amin Mousavi Khaneghah. "Incorporation of essential oils in Iranian traditional animal oil: an assessment of physicochemical and sensory assessment." Italian Journal of Food Science 33, SP1 (2021): 69–77. http://dx.doi.org/10.15586/ijfs.v33isp1.2027.

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This study aimed to incorporate the herbal essential oils (Ziziphora tenuior L. (Z. tenuior), Ferulago angulata (F. angulata), and Bunium persicum (B. persicum)) all in three levels (5, 7, and 10% w/w) and tertiary butyl hydroquinone (100, 200, and 300 ppm) to evaluate the oxidation stability of Iranian animal oil (IAO). Z. tenuior, F. angulata, and B. persicum (5, 7, and 10% w/w) and tertiary butyl hydroquinone (100, 200, and 300 ppm) were added to IAO. The physicochemical properties and color analysis, and sensory characteristics (odor, taste, rancidity, and overall acceptability) of the tre

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17

Dong, Yong-Ping, Qian-Feng Zhang, and Taike Duan. "Comparative Studies of Electrochemical Behaviors of Benzenediols at a Gold Nanoparticle/carbon Nanotube Composite Modified Glassy Carbon Electrode." Journal of New Materials for Electrochemical Systems 14, no. 3 (2011): 183–89. http://dx.doi.org/10.14447/jnmes.v14i3.108.

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A gold nanoparticle/carbon nanotube composite modified glassy carbon electrode was fabricated and used to investigate electrochemical characteristics of hydroquinone, catechol, and resorcinol via cyclic voltammetric analysis under neutral pH conditions. The results imply that the gold nanoparticle/carbon nanotbue modified electrode exhibited a synergistic and excellent electrocatalytic effect of gold nanoparticles and carbon nanotube on the redox behaviors of benzenediols. The reversibility of electrochemical reaction was improved greatly and the peak currents were increased significantly comp

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18

Yang, Jie, Dawei Li, Zengyuan Pang, and Qufu Wei. "Laccase Biosensor Based on Ag-Doped TiO2 Nanoparticles on CuCNFs for the Determination of Hydroquinone." Nano 11, no. 12 (2016): 1650132. http://dx.doi.org/10.1142/s1793292016501320.

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A novel nanomaterial composed of copper and carbon nanofibers (CuCNFs) decorated with Ag-doped TiO2 (Ag–TiO[Formula: see text] nanoparticles was prepared through electrospinning, carbonization and solvothermal treatment. The composites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). The obtained composites were mixed with laccase and Nafion to construct novel hydroquinone biosensor. The electrochemical behavior of the novel

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19

Li, Shao Hua, Ying Ying Zhao, Jun Qing Yang, Guo Yan Zhang, and Ju Rui Qi. "The Application of Glassy Carbon Electrode Modified by Multi-Walled Carbon Nanotubes for the Fast Determination of Hydroquinone in Wastewater." Advanced Materials Research 955-959 (June 2014): 1160–66. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.1160.

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A novel multi-walled carbon nanotubes (MWCNTs)-modified glassy carbon electrode (GCE) with excellent stability, repeatability and anti-interference was synthesized and it exhibited an electrocatalytic signal for hydroquinone (HQ) compared to bare GCE, which suggested that the presence of MWCNTs efficiently enhances electron transfer. Various parameters such as pH, modifier volume, and scan rate were optimized using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. Under optimum conditions, linear responses for HQ in 0.1mol·L-1 phosphate buffer solution of pH 6.0 were ob

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20

Yang, Lan, Qian Li, Yanmei Feng, and Daiyu Qiu. "Simultaneous Determination of Three Coumarins in Angelica dahurica by 1H-qNMR Method: A Fast and Validated Method for Crude Drug Quality Control." Journal of Analytical Methods in Chemistry 2020 (March 24, 2020): 1–7. http://dx.doi.org/10.1155/2020/8987560.

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In this study, a quantitative 1H NMR method (1H-qNMR) for determining the contents of imperatorin, byakangelicin, and oxypeucedanin in A. dahurica in traditional Chinese medicine (TCM) has been established. Dried plant material was extracted exhaustively with methanol by an ultrasonication-assisted extraction method. The 1H-qNMR measurements were performed on a 600 -MHz spectrometer with hydroquinone as the internal standard reference in deuterated dimethyl sulfoxide (DMSO-d6) solvent. Quantification was carried out using the 1H resonance signals at 6.55 ppm for hydroquinone and 7.68, 7.38-7.3

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21

Serrano, Dolores R., María José Gordo, Antonio Matji, Salvador González, Aikaterini Lalatsa, and Juan José Torrado. "Tuning the Transdermal Delivery of Hydroquinone upon Formulation with Novel Permeation Enhancers." Pharmaceutics 11, no. 4 (2019): 167. http://dx.doi.org/10.3390/pharmaceutics11040167.

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Hydroquinone (HQ) is an anti-hyperpigmentation agent with poor physicochemical stability. HQ formulations are currently elaborated by compounding in local pharmacies. Variability in the characteristics of HQ topical formulations can lead to remarkable differences in terms of their stability, efficacy, and toxicity. Four different semisolid O/W formulations with 5% HQ were prepared using: i) Beeler´s base plus antioxidants (F1), ii) Beeler´s base and dimethyl isosorbide (DMI) as solubiliser (F2), iii) olive oil and DMI (F3), and iv) Nourivan®, a skin-moisturising and antioxidant base, along wit

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22

Jeong, Jae Hak, Yesol Woo, Jiyeong Jang, et al. "Structural stability and guest occupation behavior of gamma-irradiated argon-loaded hydroquinone clathrates." Radiation Physics and Chemistry 174 (September 2020): 108982. http://dx.doi.org/10.1016/j.radphyschem.2020.108982.

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23

Guo, Wenchang, David Siegel, and David Ross. "Stability of the Hsp90 Inhibitor 17AAG Hydroquinone and Prevention of Metal‐Catalyzed Oxidation." Journal of Pharmaceutical Sciences 97, no. 12 (2008): 5147–57. http://dx.doi.org/10.1002/jps.21394.

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24

Duffield, Chloe, Nana Lyu, and Yuling Wang. "Synthesis and characterization of reporter molecules embedded core-shell nanoparticles as SERS nanotags." Journal of Innovative Optical Health Sciences 14, no. 04 (2021): 2141007. http://dx.doi.org/10.1142/s1793545821410078.

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Surface-enhanced Raman scattering (SERS) spectroscopy is presented as a sensitive and specific molecular tool for clinical diagnosis and prognosis monitoring of various diseases including cancer. In order for clinical application of SERS technique, an ideal method of bulk synthesis of SERS nanoparticles is necessary to obtain sensitive, stable and highly reproducible Raman signals. In this contribution, we determined the ideal conditions for bulk synthesis of Raman reporter (Ra) molecules embedded silver-gold core-shell nanoparticles (Au@Ra@ AgNPs) using hydroquinone as reducing agent of silve

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25

Yuan, Zidan, Danni Zhang, Shaofeng Wang, et al. "Effect of hydroquinone-induced iron reduction on the stability of scorodite and arsenic mobilization." Hydrometallurgy 164 (September 2016): 228–37. http://dx.doi.org/10.1016/j.hydromet.2016.06.001.

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26

Aidoudi, Farida H., Alessandro Sinopoli, Muthumeenal Arunachalam, Belabbes Merzougui, and Brahim Aïssa. "Synthesis and Characterization of a Novel Hydroquinone Sulfonate-Based Redox Active Ionic Liquid." Materials 14, no. 12 (2021): 3259. http://dx.doi.org/10.3390/ma14123259.

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Introducing redox-active moieties into an ionic liquid (IL) structure is an exciting and attractive approach that has received increasing interest over recent years for a various range of energy applications. The so-called redox-active ionic liquids (RAILs) provide a highly versatile platform to potentially create multifunctional electroactive materials. Ionic liquids are molten salts consisting of ionic species, often having a melting point lower than 100 °C. Such liquids are obtained by combining a bulky asymmetric organic cation and a small anion. Here, we report on the synthesis of a novel

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27

Qu, Ke, Mingxi Fang, Shuwei Zhang, Haiying Liu, and Xiangqun Zeng. "A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode." Polymers 10, no. 11 (2018): 1191. http://dx.doi.org/10.3390/polym10111191.

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This work reports the design, synthesis, and characterization of a novel redox-active conjugated polyaniline containing quinone moiety as a solid state reference electrode. The union of electro-active quinone with π-conjugated polyaniline was created by the first chemical synthesis of para-dimethoxybenzene-functionalized aniline as a monomer using a palladium-mediated coupling. The successful polymerization of the as-prepared monomer was accomplished without acid additives. Its post-polymerization modification with strong Lewis acid boron tribromide furnished unique poly (aniline quinone/hydro

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28

Shi, Xian He, Meng Chen, Yan Wen Wu, and Jie Ouyang. "Optimization of Ultrasonic-Assisted Preparation of Liposome-Encapsulated Paprika Red and its Improved Light Irradiation Stability." Advanced Materials Research 781-784 (September 2013): 1791–800. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.1791.

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Investigations were carried out to optimize ultrasonic-assisted preparation of liposome-encapsulated paprika red. The effect of process variables namely the ratio of soybean lecithin to paprika red, solvent volume, cholesterol content and sonication time was evaluated using single-factor test and response surface method (RSM). The liposomes showed significant effect on the improvement of light irradiation stability of paprika red, and the stability was greatly improved when antioxidants such as tert-butyl hydroquinone (TBHQ) or dl-α-tocopherol were introduced. The optimal ingredient for liposo

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29

Low, C. T. J., and F. C. Walsh. "The stability of an acidic tin methanesulfonate electrolyte in the presence of a hydroquinone antioxidant." Electrochimica Acta 53, no. 16 (2008): 5280–86. http://dx.doi.org/10.1016/j.electacta.2008.01.093.

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30

Gu, Chun Chuan, Xiao Ping Li, and Hong Ying Liu. "Simultaneous Determination of Hydroquinone, and Catechol Using a Multi-Walled Carbon Nanotube/GC Electrode Modified by Electrodeposition of Carbon Nanodots." Journal of Nano Research 54 (August 2018): 42–53. http://dx.doi.org/10.4028/www.scientific.net/jnanor.54.42.

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Herein, in order to detect hydroquinone (HQ) and catechol (CC) simultaneously, an electrochemical sensor with good selectivity and sensitivity was developed. It is constructed by electrodeposition of carbon nanodots (CDs) on the surface of multi-walled carbon nanotubes (MWNTs) doped glassy carbon electrode. First, the experimental parameter was optimized. The electrochemical behavior was then evaluated by electrochemical impedance spectroscopy and cyclic voltammetry. The linear range for HQ and CC was 0.1-200 μM, and the detection limit was 0.03 μM. Incorporated the large surface area and fast

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31

Alqasoumi, Saleh, Prawez Alam, Adnan Al-Rehaily, Faiyaz Shakeel, and Maged Abdel-Kader. "Stability-indicating densitometric HPTLC method for qualitative and quantitative analysis of hydroquinone in commercial whitening creams." Journal of Planar Chromatography – Modern TLC 24, no. 1 (2011): 48–52. http://dx.doi.org/10.1556/jpc.24.2011.1.9.

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32

Oyama, Dai, Masato Kido, Ryosuke Abe, and Tsugiko Takase. "Stability Dependence on Redox–active Site Structure in Free Catechol‐ or Hydroquinone–substituted Polypyridylruthenium(II) Complexes." ChemistrySelect 2, no. 8 (2017): 2583–87. http://dx.doi.org/10.1002/slct.201700153.

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33

Patel, K. C., S. N. Kaula, and P. S. Patel. "Synthesis and Physico-Chemical Properties of 2-Morpholino-4,6-Dichloro-S-Triazine with Various Aromatic Diols." High Performance Polymers 8, no. 2 (1996): 265–73. http://dx.doi.org/10.1088/0954-0083/8/2/007.

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Several homopolycyanurates were synthesized by stirred interfacial polycondensation of 2-morpholino-4,6-dichloro- s-triazine with various aromatic diols such as 1,5- dihydroxynaphthalene,(DHN-1,5),1,7-dihydroxynapthalene(DHN-1,7),2,7-dihydroxynapthalene resorcinol (R), catechol (C), hydroquinone (H) and phenolphthalein (Ph). They were characterized by density, viscosity measurements, IR spectra, solubility tests and thermogravimetric analysis. The polymer had reduced viscosities in the range 0.468 to 0.829 dl g−1 in chromoform at 30 °C. All the polymers were amorphous and soluble in chlorinate

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34

Boo, Yong Chool. "Arbutin as a Skin Depigmenting Agent with Antimelanogenic and Antioxidant Properties." Antioxidants 10, no. 7 (2021): 1129. http://dx.doi.org/10.3390/antiox10071129.

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Arbutin is a compound of hydroquinone and D-glucose, and it has been over 30 years since there have been serious studies on the skin lightening action of this substance. In the meantime, there have been debates and validation studies about the mechanism of action of this substance as well as its skin lightening efficacy and safety. Several analogs or derivatives of arbutin have been developed and studied for their melanin synthesis inhibitory action. Formulations have been developed to improve the stability, transdermal delivery, and release of arbutin, and device usage to promote skin absorpt

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35

Kurdali, F. "N2-FIXATION IN CHICKPEA: EFFECT OF HYDROQUINONE AS A UREASE INHIBITOR ON THE STABILITY OF 15N ENRICHMENT." Communications in Soil Science and Plant Analysis 32, no. 3-4 (2001): 453–64. http://dx.doi.org/10.1081/css-100103021.

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36

Leane, Deirdre, and Tia E. Keyes. "Electronic coupling and photochemical stability of O,N bound mononuclear Ru(II) and Os(II) – Hydroquinone complexes." Inorganica Chimica Acta 359, no. 5 (2006): 1627–36. http://dx.doi.org/10.1016/j.ica.2005.11.016.

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37

Mohamed Shameer, P., and K. Ramesh. "FTIR evaluation on the fuel stability of calophyllum inophyllum biodiesel: Influence of tert-butyl hydroquinone (TBHQ) antioxidant." Journal of Mechanical Science and Technology 31, no. 7 (2017): 3611–17. http://dx.doi.org/10.1007/s12206-017-0648-5.

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38

Ren, Lijun, Gaini Zhang, Ji Lei, Yan Wang, and Dengwei Hu. "Novel layered polyaniline-poly(hydroquinone)/graphene film as supercapacitor electrode with enhanced rate performance and cycling stability." Journal of Colloid and Interface Science 512 (February 2018): 300–307. http://dx.doi.org/10.1016/j.jcis.2017.10.067.

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39

Wei, Wenxuan, Li Yang, and Guanjun Chang. "Heat-resistant and photoluminescent indole-based poly(ether sulfone)s." High Performance Polymers 30, no. 4 (2017): 475–79. http://dx.doi.org/10.1177/0954008317701823.

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Indole-based poly(ether sulfone)s (PINESs), as novel high-performance polymers, have been obtained by the condensation polymerization of 4-hydroxyindole and hydroquinone with activated difluoro monomers via a catalyst-free nucleophilic substitution reaction. The structures of the polymers are characterized by means of Fourier transform infrared and proton nuclear magnetic resonance spectroscopy, and the results show good agreement with the proposed structures. Differential scanning calorimetry and thermogravimetric analysis measurements exhibit that polymers possess high glass transition tempe

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Radmanesh, Reihaneh, Mohsen Nabi Meybodi, Vahid Ramezani, Maryam Akrami, Mohammad Ali Ranjbar, and Azadeh Emami. "Investigation of Microbial Contamination and Physicochemical Properties of Compounded Medications in Pharmacies." Quarterly of the Horizon of Medical Sciences 26, no. 1 (2020): 82–93. http://dx.doi.org/10.32598/hms.26.1.3175.1.

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Aims: Any pharmaceutical product made in pharmacy, hospital or factory may be contaminated with microbes. This contamination can originate from raw materials or during production. Hence, it is important to study the physical and chemical properties and stability of compounded drugs. Methods & Materials: In this study, first a specific sample of prescribed medication was ordered from 63 pharmacies in Yazd, Iran. After collecting the samples, the amount of microbial contamination, viscosity and particle size distribution and their stability were investigated and their results were compared t

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Huynh, Phat Trong, Giang Dang Nguyen, Khanh Thi Le Tran, Thu Minh Ho, Vinh Quang Lam, and Thanh Vo Ke Ngo. "Rapid and Green Preparation of Multi-Branched Gold Nanoparticles Using Surfactant-Free, Combined Ultrasound-Assisted Method." Processes 9, no. 1 (2021): 112. http://dx.doi.org/10.3390/pr9010112.

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The conventional seed-mediated preparation of multi-branched gold nanoparticles uses either cetyltrimethylammonium bromide or sodium dodecyl sulfate. However, both surfactants are toxic to cells so they have to be removed before the multi-branched gold nanoparticles can be used in biomedical applications. This study describes a green and facile method for the preparation of multi-branched gold nanoparticles using hydroquinone as a reducing agent and chitosan as a stabilizer, through ultrasound irradiation to improve the multi-branched shape and stability. The influence of pH, mass concentratio

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Huynh, Phat Trong, Giang Dang Nguyen, Khanh Thi Le Tran, Thu Minh Ho, Vinh Quang Lam, and Thanh Vo Ke Ngo. "Rapid and Green Preparation of Multi-Branched Gold Nanoparticles Using Surfactant-Free, Combined Ultrasound-Assisted Method." Processes 9, no. 1 (2021): 112. http://dx.doi.org/10.3390/pr9010112.

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The conventional seed-mediated preparation of multi-branched gold nanoparticles uses either cetyltrimethylammonium bromide or sodium dodecyl sulfate. However, both surfactants are toxic to cells so they have to be removed before the multi-branched gold nanoparticles can be used in biomedical applications. This study describes a green and facile method for the preparation of multi-branched gold nanoparticles using hydroquinone as a reducing agent and chitosan as a stabilizer, through ultrasound irradiation to improve the multi-branched shape and stability. The influence of pH, mass concentratio

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Ahn, Jong Gwan, Dong Jin Kim, Jae Ryeong Lee, H. S. Jung, and Byoung Gyu Kim. "Synthesis of Mono-Dispersed Fine Spherical Silver Powders by Chemical Reduction Method." Materials Science Forum 539-543 (March 2007): 2782–86. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.2782.

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The synthesis of spherical silver powders by chemical reduction method was investigated. Conductive metal pastes to have good properties in adhesion, stability, and conductivity, it is very important to control the purity, size, and shape of metal particles. In the present study, proper methods to control the properties of micron sized metal powders for conductive pastes are investigated. Chemical reduction method in aqueous solution was adapted to produce silver powder. The effects of reaction time, concentration of reductant and additives, and stirring speed were investigated, in experimenta

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Singh, Chanderpratap, and Amit Paul. "Immense Microporous Carbon@Hydroquinone Metamorphosed from Nonporous Carbon As a Supercapacitor with Remarkable Energy Density and Cyclic Stability." ACS Sustainable Chemistry & Engineering 6, no. 9 (2018): 11367–79. http://dx.doi.org/10.1021/acssuschemeng.8b01239.

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Han, Chunlei, Yali Ye, Guanwen Wang, Wei Hong, and Chunhua Feng. "Selective electro-oxidation of phenol to benzoquinone/hydroquinone on polyaniline enhances capacitance and cycling stability of polyaniline electrodes." Chemical Engineering Journal 347 (September 2018): 648–59. http://dx.doi.org/10.1016/j.cej.2018.04.109.

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Wu, Shuisheng, Nianyuan Tan, Donghui Lan, Chak-Tong Au, and Bing Yi. "Construction and Application of a Non-Enzyme Hydrogen Peroxide Electrochemical Sensor Based on Eucalyptus Porous Carbon." Sensors 18, no. 10 (2018): 3464. http://dx.doi.org/10.3390/s18103464.

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Natural eucalyptus biomorphic porous carbon (EPC) materials with unidirectional ordered pores have been successfully prepared by carbonization in an inert atmosphere. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) were employed to characterize the phase identification, microstructure and morphology analysis. The carbon materials were used to fabricate electrochemical sensors to detect hydrogen peroxide (H2O2) without any assistance of enzymes because of their satisfying electrocatalytic properties. It was immobilized on a glassy

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Syahrullail, Samion, and Paiman Zulhanafi. "The Oxidation Effect of Palm Oil Based Lubricant Using Four – Ball Tribotester." Applied Mechanics and Materials 554 (June 2014): 281–85. http://dx.doi.org/10.4028/www.scientific.net/amm.554.281.

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Lubrications industry is widely expand throughout the years. Well established mineral oil based promised the highest demand all over the world. But as the environmental concern is debated at most of world conferences, people are thinking to find the alternative for mineral oil replacement due to its non-biodegradable behaviour. The best suited source that having quite a par characteristic with mineral oil is vegetable oil. Vegetable oil is well known with its super bio-degradable characteristic. The source is renewable and does not require huge cost as compared to mineral and synthetic oil in

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Banu, M. "Radical Scavenging Activity of Tertiary Butyl Hydroquinone and Assessment of Stability of Palm Oil ( Elaeis guineensis ) by Ultrasonic Studies." Chemical and Biochemical Engineering Quarterly Journal 30, no. 4 (2017): 477–87. http://dx.doi.org/10.15255/cabeq.2015.2185.

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Tossell, J. A. "Quinone–hydroquinone complexes as model components of humic acids: Theoretical studies of their structure, stability and Visible–UV spectra." Geochimica et Cosmochimica Acta 73, no. 7 (2009): 2023–33. http://dx.doi.org/10.1016/j.gca.2008.12.029.

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Yuan, Zidan, Xu Ma, Xing Wu, Xin Wang, Shaofeng Wang, and Yongfeng Jia. "Effect of hydroquinone-induced iron reduction on the stability of Fe(III)-As(V) Co-precipitate and arsenic mobilization." Applied Geochemistry 97 (October 2018): 1–10. http://dx.doi.org/10.1016/j.apgeochem.2018.07.017.

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