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Journal articles on the topic 'Urea hydrogen peroxide'

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Published: 4 June 2021
Last updated: 17 February 2022

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1

Taliansky, Sandra. "Urea-Hydrogen Peroxide Complex." Synlett 2005, no. 12 (July 20, 2005): 1962–63. http://dx.doi.org/10.1055/s-2005-871968.

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2

Li, Zong Quan, Hong Yan Dou, Xiao Qian Chen, and Chao Wang. "Improving Hydrogen Peroxide Bleaching of PRC-APMP by Using Urea." Applied Mechanics and Materials 295-298 (February 2013): 335–38. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.335.

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Preconditioning Refiner Chemic Alkaline Peroxide Mechanical Pulp (PRC-APMP) is one of the most currently used high yield pulps in China. During the bleaching of PRC-APMP, hydrogen peroxide is a commonly used bleaching agent. In order to improve the bleaching efficiency of PRC-APMP, urea was used as an activator in peroxide bleaching of aspen PRC-APMP. The results showed that the brightness of the urea-based bleached pulp higher than that without urea addition at the same hydrogen peroxide dosage. The physical properties such as the breaking length, tear index and fiber length of the bleached pulp were comparable to those without urea addition in peroxide bleaching.
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3

A. Valderrama, Jaime, M. Florencia González, and Cristián Torres. "Epoxidation of Quinones with Urea Hydrogen Peroxide." HETEROCYCLES 60, no. 10 (2003): 2343. http://dx.doi.org/10.3987/com-03-9863.

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4

Cooper, Mark S., Harry Heaney, Amanda J. Newbold, and William R. Sanderson. "Oxidation Reactions Using Urea-Hydrogen Peroxide; A Safe Alternative to Anhydrous Hydrogen Peroxide." Synlett 1990, no. 09 (1990): 533–35. http://dx.doi.org/10.1055/s-1990-21156.

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5

Zun, Maria, Dorota Dwornicka, Katarzyna Wojciechowska, Katarzyna Swiader, Regina Kasperek, Marzena Rzadkowska, and Ewa Poleszak. "Kinetics of the decomposition and the estimation of the stability of 10% aqueous and non-aqueous hydrogen peroxide solutions." Current Issues in Pharmacy and Medical Sciences 27, no. 4 (December 1, 2014): 213–16. http://dx.doi.org/10.1515/cipms-2015-0017.

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Abstract In this study, the stability of 10% hydrogen peroxide aqueous and non-aqueous solutions with the addition of 6% (w/w) of urea was evaluated. The solutions were stored at 20°C, 30°C and 40°C, and the decomposition of hydrogen peroxide proceeded according to first-order kinetics. With the addition of the urea in the solutions, the decomposition rate constant increased and the activation energy decreased. The temperature of storage also affected the decomposition of substance, however, 10% hydrogen peroxide solutions prepared in PEG-300, and stabilized with the addition of 6% (w/w) of urea had the best constancy.
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6

Lespinas, F., G. Dupuy, F. Revol, and C. Aubry. "Enzymic urea assay: a new colorimetric method based on hydrogen peroxide measurement." Clinical Chemistry 35, no. 4 (April 1, 1989): 654–58. http://dx.doi.org/10.1093/clinchem/35.4.654.

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Abstract We describe a new enzymic colorimetric method in which urea is measured in serum by use of a single reagent mixture. Ammonia produced by urea hydrolysis, catalyzed by urease, reacts with glutamate and ATP in the presence of glutamine synthetase. The ADP so produced is assayed in reactions catalyzed sequentially by pyruvate kinase and pyruvate oxidase in a system that generates hydrogen peroxide. The hydrogen peroxide is measured at 500 or 550 nm in a reaction catalyzed by horseradish peroxidase, with phenol/4-aminophenazone as the chromogen. The reaction is complete in 15 min at 37 degrees C. The standard curve is linear up to a urea concentration of 40 mmol/L. Precision is good; CVs ranged from 2.5% to 3.1%. Results by the present method compared well with those by a candidate Reference Method and are not subject to interferences from commonly used drugs and anticoagulants.
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7

Narendranath, N. V., K. C. Thomas, and W. M. Ingledew. "Urea Hydrogen Peroxide Reduces the Numbers of Lactobacilli, Nourishes Yeast, and Leaves No Residues in the Ethanol Fermentation." Applied and Environmental Microbiology 66, no. 10 (October 1, 2000): 4187–92. http://dx.doi.org/10.1128/aem.66.10.4187-4192.2000.

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ABSTRACT Urea hydrogen peroxide (UHP) at a concentration of 30 to 32 mmol/liter reduced the numbers of five Lactobacillus spp. (Lactobacillus plantarum, L. paracasei,Lactobacillus sp. strain 3, L. rhamnosus, andL. fermentum) from ∼107 to ∼102CFU/ml in a 2-h preincubation at 30°C of normal-gravity wheat mash at ∼21 g of dissolved solids per ml containing normal levels of suspended grain particles. Fermentation was completed 36 h after inoculation of Saccharomyces cerevisiae in the presence of UHP, even when wheat mash was deliberately contaminated (infected) withL. paracasei at ∼107 CFU/ml. There were no significant differences in the maximum ethanol produced between treatments when urea hydrogen peroxide was used to kill the bacteria and controls (in which no bacteria were added). However, the presence of L. paracasei at ∼107 CFU/ml without added agent resulted in a 5.84% reduction in the maximum ethanol produced compared to the control. The bactericidal activity of UHP is greatly affected by the presence of particulate matter. In fact, only 2 mmol of urea hydrogen peroxide per liter was required for disinfection when mashes had little or no particulate matter present. No significant differences were observed in the decomposition of hydrogen peroxide in normal-gravity wheat mash at 30°C whether the bactericidal agent was added as H2O2 or as urea hydrogen peroxide. NADH peroxidase activity (involved in degrading H2O2) increased significantly (P = 0.05) in the presence of 0.75 mM hydrogen peroxide (sublethal level) in all five strains of lactobacilli tested but did not persist in cells regrown in the absence of H2O2. H2O2-resistant mutants were not expected or found when lethal levels of H2O2 or UHP were used. Contaminating lactobacilli can be effectively managed by UHP, a compound which when used at ca. 30 mmol/liter happens to provide near-optimum levels of assimilable nitrogen and oxygen that aid in vigorous fermentation performance by yeast.
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8

Zhao, Xiao Ling. "Preparation of Silver Nano-Particles by CO(NH2)2·H2O2." Advanced Materials Research 391-392 (December 2011): 1244–47. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.1244.

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This article will present using chemical reduction to prepare silver nano-particles, which is a certain improvement base on the traditional hydrogen peroxide (H2O2) Silver ammonia by using a new reductant urea peroxide (CO (NH2) 2•H2O2) to replace hydrogen peroxide. Hydrogen Peroxide silver ammonia is widely used in the nano-silver particles Preparation, however, the nano-silver particles prepared in traditional ways is not homogeneous and very easy agglomerated, therefore, in this experimental by using of urea peroxide as a reductant, under condition of temperature 30°C, 45 nm homogeneous nano-silver particles is successfully prepared. The detection instrument used in the experimental is transmission electron microscopy and laser particle size analyzer.
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9

Ball, Matthew C., and Steven Massey. "The thermal decomposition of solid urea hydrogen peroxide." Thermochimica Acta 261 (September 1995): 95–106. http://dx.doi.org/10.1016/0040-6031(95)02399-m.

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10

COOPER, M. S., H. HEANEY, A. J. NEWBOLD, and W. R. SANDERSON. "ChemInform Abstract: Oxidation Reactions Using Urea-Hydrogen Peroxide. A Safe Alternative to Anhydrous Hydrogen Peroxide." ChemInform 22, no. 5 (August 23, 2010): no. http://dx.doi.org/10.1002/chin.199105124.

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11

Ji, Li, Ya-Na Wang, Chao Qian, and Xin-Zhi Chen. "Nitrile-Promoted Alkene Epoxidation with Urea–Hydrogen Peroxide (UHP)." Synthetic Communications 43, no. 16 (June 3, 2013): 2256–64. http://dx.doi.org/10.1080/00397911.2012.699578.

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12

Zhao, Hong-Kun, Bao-Zeng Ren, Guo-Ji Liu, and Hong-Xian Wang. "Phase Diagram of the System Urea + Hydrogen Peroxide + Water." Journal of Chemical & Engineering Data 48, no. 3 (May 2003): 548–50. http://dx.doi.org/10.1021/je025549n.

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13

Patil, Govindagouda S., and Gopalpur Nagendrappa. "EPOXIDATION OF CYCLIC VINYLSILANES BY UREA-HYDROGEN PEROXIDE COMPLEX." Synthetic Communications 32, no. 17 (January 2002): 2677–81. http://dx.doi.org/10.1081/scc-120006032.

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14

Wu, John Ngao Sun. "Effect of Urea-Hydrogen Peroxide on Hypoxia in Rabbits." Respiration 48, no. 4 (1985): 303–9. http://dx.doi.org/10.1159/000194844.

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15

Momeni, Ahmad R., Hamid Aliyan, Heidar Mombeini, Ahmad R. Massah, and Hamid J. Naghash. "Aromatization of Hantzsch 1,4-Dihydropyridines with Urea-Hydrogen Peroxide/Maleic Anhydride." Zeitschrift für Naturforschung B 61, no. 3 (March 1, 2006): 331–33. http://dx.doi.org/10.1515/znb-2006-0314.

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16

Eslami, S. H., M. A. Ebrahimzadeh, Hajizadeh Moghaddam, S. F. Nabavi, N. Jafari, and S. M. Nabavi. "Renoprotective effect of Eryngium caucasicum in Gentamicin-induced nephrotoxic mice." Archives of Biological Sciences 63, no. 1 (2011): 157–60. http://dx.doi.org/10.2298/abs1101157e.

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Recent studies show that hydrogen peroxide free radicals have an important role in the renal damage induced by Gentamicin. Previously we studied the hydrogen peroxide scavenging activity of Eryngium caucasicum. This work was conducted to evaluate the possible renoprotective effect of Eryngium caucasicum against Gentamicin-induced renotoxicity. Extracts at the doses 200 and 400 mg/kg/day for 10 consecutive days, by intraperitoneal route (i.p.) offered renoprotective action by change in the blood urea nitrogen (BUN), serum urea and creatinine. Results show that an extract at 400 mg/kg/ day shows better activity than other tested samples. In conclusion, the extracts showed significant renoprotective activity compared with the control group.
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17

Yang, Sunmi, Mitsuru Tahara, and Masako Maekawa. "Effects of Urea on Hydrogen Peroxide Bleaching of Cotton Fabrics." FIBER 66, no. 2 (2010): 51–55. http://dx.doi.org/10.2115/fiber.66.51.

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18

Ankudey, Emanuel G., Horacio F. Olivo, and Tonya L. Peeples. "Lipase-mediated epoxidation utilizing urea–hydrogen peroxide in ethyl acetate." Green Chem. 8, no. 10 (2006): 923–26. http://dx.doi.org/10.1039/b604984b.

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19

Dobado, J. A., José Molina, and Dolores Portal. "Theoretical Study on the Urea−Hydrogen Peroxide 1:1 Complexes." Journal of Physical Chemistry A 102, no. 4 (January 1998): 778–84. http://dx.doi.org/10.1021/jp972611s.

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20

Matyáš, Robert, Jakub Selesovsky, Vojtěch Pelikán, Mateusz Szala, Stanisław Cudziło, Waldemar A. Trzciński, and Michael Gozin. "Explosive Properties and Thermal Stability of Urea-Hydrogen Peroxide Adduct." Propellants, Explosives, Pyrotechnics 42, no. 2 (October 14, 2016): 198–203. http://dx.doi.org/10.1002/prep.201600101.

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21

Ying, Hanze, Yingfeng Yang, Kaimin Cai, and Jianjun Cheng. "Hindered Urea Bond: A Bilaterally Responsive Chemistry to Hydrogen Peroxide." European Journal of Organic Chemistry 2019, no. 4 (January 15, 2019): 728–31. http://dx.doi.org/10.1002/ejoc.201801307.

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22

Mazurek, Krzysztof, Mieczysław Trypuć, Katarzyna Białowicz, and Sebastian Drużyński. "The influence of leaching solution pH and addition of peroxide hydrogen on the recovery of some components from the used vanadium catalyst with urea solutions." Polish Journal of Chemical Technology 10, no. 4 (January 1, 2008): 34–36. http://dx.doi.org/10.2478/v10026-008-0044-0.

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The influence of leaching solution pH and addition of peroxide hydrogen on the recovery of some components from the used vanadium catalyst with urea solutions The research was conducted to determine the influence of the pH of the leaching solutions and hydrogen peroxide addition on the efficiency of the recovery of vanadium, potassium and iron compounds from the used vanadium catalyst from the node of oxidation of sulfur dioxide to sulfur trioxide.
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23

Ji, Li, Jinqiang Liu, Chao Qian, and Xinzhi Chen. "Advances in the Application of Urea-Hydrogen Peroxide to Oxidation Reactions." Chinese Journal of Organic Chemistry 32, no. 2 (2012): 254. http://dx.doi.org/10.6023/cjoc1103243.

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24

Lee, Albert W. M., Viktor O. Rogatchov, and Peter Metz. "Asymmetric epoxidation of N-enoylsultams with urea-hydrogen peroxide/trifluoroacetic anhydride." Journal of Chemical Research 2005, no. 12 (December 1, 2005): 755–56. http://dx.doi.org/10.3184/030823405775147004.

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25

Jin, Hong, Haoyu Zhao, Feihu Zhao, Shihong Li, Wei Liu, Guoping Zhou, Ke Tao, and Taiping Hou. "Efficient epoxidation of chalcones with urea-hydrogen peroxide under ultrasound irradiation." Ultrasonics Sonochemistry 16, no. 3 (March 2009): 304–7. http://dx.doi.org/10.1016/j.ultsonch.2008.10.013.

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26

Etemadzadeh, Hossein. "Plaque-growth inhibiting effect of chewing gum containing urea hydrogen peroxide." Journal of Clinical Periodontology 18, no. 5 (May 1991): 337–40. http://dx.doi.org/10.1111/j.1600-051x.1991.tb00438.x.

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27

Patil, Govindagouda S., and Gopalpur Nagendrappa. "ChemInform Abstract: Epoxidation of Cyclic Vinylsilanes by Urea-Hydrogen Peroxide Complex." ChemInform 33, no. 51 (May 18, 2010): no. http://dx.doi.org/10.1002/chin.200251124.

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28

Liu, Haibin, Jilin Cao, Changhong Gao, and Jianjun Zhao. "Equilibrium Studies on the System Water + Hydrogen Peroxide + Urea + Carbon Dioxide." Journal of Chemical & Engineering Data 55, no. 12 (December 9, 2010): 5715–18. http://dx.doi.org/10.1021/je100668w.

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29

Courrol, Lilia C., Maria H. Bellini, Luiz V. G. Tarelho, Flávia R. O. Silva, Ronaldo D. Mansano, Laércio Gomes, Nilson D. Vieira, and Nestor Shor. "Urea hydrogen peroxide determination in whole blood using europium tetracycline probe." Analytical Biochemistry 355, no. 1 (August 2006): 140–44. http://dx.doi.org/10.1016/j.ab.2006.05.015.

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30

Ji, Li, Ya-Na Wang, Chao Qian, and Xin-Zhi Chen. "ChemInform Abstract: Nitrile-Promoted Alkene Epoxidation with Urea-Hydrogen Peroxide (UHP)." ChemInform 44, no. 42 (October 1, 2013): no. http://dx.doi.org/10.1002/chin.201342030.

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31

Anselmi, Silvia, Siyu Liu, Seong-Heun Kim, Sarah M. Barry, Thomas S. Moody, and Daniele Castagnolo. "A mild and chemoselective CALB biocatalysed synthesis of sulfoxides exploiting the dual role of AcOEt as solvent and reagent." Organic & Biomolecular Chemistry 19, no. 1 (2021): 156–61. http://dx.doi.org/10.1039/d0ob01966f.

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Sulfoxides have been synthesised from various sulfide substrates under mild conditions exploiting CALB biocatalyst in the presence of urea hydrogen peroxide and AcOEt which acts with the dual role of solvent and reagent.
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32

Khan, Shanza Rauf, Muhammad Umar Khalid, Saba Jamil, Songnan Li, Aiman Mujahid, and Muhammad Ramzan Saeed Ashraf Janjua. "Photocatalytic degradation of reactive black 5 on the surface of tin oxide microrods." Journal of Water and Health 16, no. 5 (July 11, 2018): 773–81. http://dx.doi.org/10.2166/wh.2018.033.

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Abstract A simple co-precipitation technique is proposed for synthesis of tin oxide (SnO2) microrods. Stannous chloride and urea were used during synthesis. X-ray powder diffraction (XRD) analysis revealed that the annealed product consists of SnO2 microrods having tetragonal unit cells, while scanning electron microscopy (SEM) analysis revealed the rod-like morphology of a synthesized product. These synthesized microrods are used as photocatalyst for the degradation of reactive black 5 (RB5). Degradation kinetics of RB5 are monitored under daylight in different concentrations of hydrogen peroxide (H2O2) and catalyst. The percentage of RB5 conversion is also calculated at various concentrations of hydrogen peroxide and catalyst which demonstrate that RB5 shows high catalytic degradation at high concentrations of hydrogen peroxide and catalyst.
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33

Likhotvorik, Igor, Marlon Lutz, and Marta Wenzler. "An Efficient Oxidation of Sulfides to Sulfones with Urea–Hydrogen Peroxide in the Presence of Phthalic Anhydride in Ethyl Acetate." Synthesis 50, no. 11 (April 4, 2018): 2231–34. http://dx.doi.org/10.1055/s-0037-1609446.

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A metal-free, environmentally benign oxidation of substituted sulfides directly to their corresponding sulfones is described. Using urea-hydrogen peroxide and phthalic anhydride in ethyl acetate clean conversion into the sulfone was achieved without observation of the possible sulfoxide oxidation product.
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34

Xiao, Yong Shan, Li Yu Chen, Run Xia Lu, and Cheng Qian Tang. "Selective Oxidation of Methane to Methanol with Organic Oxidants Catalyzed by Iodine in Non-Aqueous Acetic Acid Medium." Applied Mechanics and Materials 723 (January 2015): 624–28. http://dx.doi.org/10.4028/www.scientific.net/amm.723.624.

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Various organic oxidants including tert-butyl peroxybenzoate, tert-butyl hydroperioxide (TBHP), hydrogen peroxide-urea adduct, dicumyl peroxyide and peracetic acid solution were studied for the oxidation of methane to methanol via methyl acetate catalyzed by iodine in non-aqueous acetic acid medium. Among these organic oxidants investigated, tert-butyl hydroperioxide (TBHP) exhibited the highest methane conversion. The effects of various kinetic factors on the catalytic behavior of the TBHP-I2 system were investigated, and a quantitative yield of methyl acetate (18.9%) based on methane has been obtained under the optimized conditions. A possible mechanism involving electrophilic displacement has been suggested for this reaction.
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35

Heaney, Harry, and Amanda J. Newbold. "The oxidation of aromatic aldehydes by magnesium monoperoxyphthalate and urea–hydrogen peroxide." Tetrahedron Letters 42, no. 37 (September 2001): 6607–9. http://dx.doi.org/10.1016/s0040-4039(01)01332-6.

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36

Bouh, Abdillahi Omar, and James H. Espenson. "Epoxidation reactions with urea–hydrogen peroxide catalyzed by methyltrioxorhenium(VII) on niobia." Journal of Molecular Catalysis A: Chemical 200, no. 1-2 (June 2003): 43–47. http://dx.doi.org/10.1016/s1381-1169(03)00097-9.

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37

Bagherzadeh, Mojtaba, and Maryam Zare. "Oxidation of sulfides with urea–hydrogen peroxide catalyzed by iron–salen complexes." Journal of Sulfur Chemistry 32, no. 4 (August 2011): 335–43. http://dx.doi.org/10.1080/17415993.2011.593634.

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38

Adam, Waldemar, and Catherine M. Mitchell. "Methyltrioxorhenium(VII)-Catalyzed Epoxidation of Alkenes with the Urea/Hydrogen Peroxide Adduct." Angewandte Chemie International Edition in English 35, no. 5 (March 4, 1996): 533–35. http://dx.doi.org/10.1002/anie.199605331.

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39

Ha, Su Jeong, Eun-Young Jung, Won Mi Kim, and Jong Chan Lee. "Oxidation of Benzylic Alcohols with Urea Hydrogen Peroxide/Calcium Chloride in PEGDME250." Bulletin of the Korean Chemical Society 35, no. 2 (February 20, 2014): 629–30. http://dx.doi.org/10.5012/bkcs.2014.35.2.629.

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40

Lee, Jong, and Hee Park. "Oxidation of Benzylic Alcohols with Urea-Hydrogen Peroxide and Catalytic Magnesium Bromide." Synlett 2009, no. 01 (December 12, 2008): 79–80. http://dx.doi.org/10.1055/s-0028-1087391.

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41

dos Santos, Alcindo, Edison Wendler, Francisco de Marques, and Fabio Simonelli. "Microwave-Accelerated Epoxidation of α,β-Unsaturated Ketones with Urea- Hydrogen Peroxide." Letters in Organic Chemistry 1, no. 1 (January 1, 2004): 47–49. http://dx.doi.org/10.2174/1570178043488824.

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42

Arifoglu, Mustafa, and William N. Marmer. "Sequential Oxidative/Reductive Bleaching and Dyeing of Wool in a Single Bath at Low Temperatures." Textile Research Journal 62, no. 3 (March 1992): 123–30. http://dx.doi.org/10.1177/004051759206200301.

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A new bleaching and dyeing process applicable to wool involves a sequential oxidative/reductive bleaching combined with a subsequent dyeing in a single bath. Apart from dyebath bleaching processes in which the bleaching agent is added towards the end of the dyeing process when almost all the dye is exhausted, bleaching and subsequent dyeing are normally done in separate baths due to the sensitivity of the dyes to bleaching agents. In the latter process, it is important that all bleaching agents be thoroughly washed off before dyeing, because any residual bleaching agent (hydrogen peroxide, reductive bleach) may adversely affect the results. The newly developed single-bath process begins with an oxidative hydrogen peroxide bleaching followed by addition of thiourea to the residual hydrogen peroxide in the same bath. Thiourea dioxide formed by the resulting chemical reaction hydrolyzes in solution to sulfonate anion and urea. Sulfinate anion is a strong reducing agent and effects reductive bleaching. At the end of the reductive bleaching stage, a small amount of hydrogen peroxide is added to oxidize all the reductive sulfur species in solution to the sulfate anion, which together with the urea serves subsequently as a dye assist. Once the temperature of the bath is lowered, dyes may be added to the same bath. The new sequential single-bath bleaching/dyeing process results in much brighter pastel shades upon dyeing, due to better whiteness obtained initially with sequential oxidative/reductive bleaching. Furthermore, there is a reduction in processing time, temperature, and effluent compared with conventional procedures and the utilization of byproducts from the initial bleaching assists during the subsequent dyeing step.
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43

Glover, Martin, Patrick R. Huddleston, and Michael L. Wood. "3,3′-Azothiophene." Journal of Chemical Research 37, no. 1 (January 2013): 43–44. http://dx.doi.org/10.3184/174751912x13549016589705.

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Methyl 3-nitrothiophene-2-carboxylate was reduced with bismuth(III) chloride/potassium borohydride to give an unstable hydroxylamine which was oxidised without isolation using iron(III) chloride to give methyl 3-nitrosothiophene-2-carboxylate. Condensation of this with methyl 3-aminothiophene-2-carboxylate furnished the azodiester. This was more conveniently obtained by manganese dioxide oxidation of the aminoester. Hydrolysis of the azodiester to give the diacid followed by decarboxylation gave 3,3′-azothiophene which could be oxidised to 3,3′- azoxythiophene with hydrogen peroxide. The azodiester was oxidised to the corresponding azoxydiester with urea-hydrogen peroxide/trifluoroacetic anhydride and reduced to the related hydrazothiophenediester with diimide.
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44

Li, Shu An, Run Lai Li, Zhen Ming Zhang, Kai Zhu, and Guang Jie Wang. "Improved Preparation of 2,2-Dithiobis(Pyridine-N-Oxide)." Advanced Materials Research 554-556 (July 2012): 868–73. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.868.

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2,2-Dithiobis(pyridine-N-oxide) (1) was prepared by reacting 2-pyridinethiol-N-oxide (2) and hydrogen peroxide-urea adduct (3) at the molar ratio of 1:1.25 and 45oC for 1.75h in high yield and purity of 91.6% and 99.6% respectively. The structures of product were characterized by IR, NMR.
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45

Li, Miao, Rui Zhang, Yu Lin Zhang, Xue Li Gou, Qing Zong Si, and Bin Liu. "The Research on Effects of Whitening Dentifrices on Superficial Roughness and Microstructure of Composite Resins." Advanced Materials Research 749 (August 2013): 299–303. http://dx.doi.org/10.4028/www.scientific.net/amr.749.299.

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Objective: The aim of study is to investigate the composite resins superficial roughness and microstructure after brushing with common dentifrices containing silica abrasive agent or bicarbonate and whitening dentifrices containing peroxide. Methods: Roughness measuring instruments were used to test 3M Filtek Z350 samples surface brushed by the silica abrasive (C), urea peroxide + alumina / silica (RP), the hydrogen peroxide + calcium carbonate (Ex) dentifrices before and after, using AFM to observe the superficial properties. Results: The superficial roughness after using the three dentifrices changed differently, followed by EX<RPConclusions: Relative to dentifrices containing silica abrasive, whitening dentifrices containing peroxide and alumina or silica or calcium carbonate composition has smaller friction resistance of the composite resins.
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46

Bitencourt, Thiago Bergler, and Maria da Graça Nascimento. "Chemo-enzymatic synthesis of N-alkyloxaziridines mediated by lipases and urea-hydrogen peroxide." Green Chem. 11, no. 2 (2009): 209–14. http://dx.doi.org/10.1039/b816955a.

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47

Nagasawa, Kazuo, and Shinji Tanaka. "Guanidine-Urea Bifunctional Organocatalyst for Asymmetric Epoxidation of 1,3-Diarylenones with Hydrogen Peroxide." Synlett 2009, no. 04 (February 16, 2009): 667–70. http://dx.doi.org/10.1055/s-0028-1087811.

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48

Ghiron, Chiara, Lorenzo Nannetti, and Maurizio Taddei. "Alkene epoxidation with urea–hydrogen peroxide complex and PS–DVB supported phthalic anhydride." Tetrahedron Letters 46, no. 10 (March 2005): 1643–45. http://dx.doi.org/10.1016/j.tetlet.2005.01.074.

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49

Paul, Satya, Puja Nanda, and Rajive Gupta. "Solvent-Free Benzylic Oxidations Using Urea-Hydrogen Peroxide Complex (UHP) under Microwave Irradiation." Synlett, no. 3 (2004): 531–33. http://dx.doi.org/10.1055/s-2004-815418.

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50

Kaur, Damandeep, R. Manktala, K. K. Chahal, and B. R. Chhabra. "ChemInform Abstract: Epoxidation Studies of Terpenes with Urea Hydrogen Peroxide and Phosphotungstic Acid." ChemInform 41, no. 38 (August 26, 2010): no. http://dx.doi.org/10.1002/chin.201038200.

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