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Isopropyl alcohol

Choon Chiat Oh, Hazel H Oon, See Ket Ng, Shang Ian Tee, Anjali Jhingan, Wei-Sheng Chong
The term terra firma-forme dermatosis arises from the Latin phrase terra firma, meaning dry land (dirt), thus implying dirt-like dermatosis. The authors highlight five cases of patients with terra firma-forme dermatosis presenting to our dermatology center between 2012 and 2013. All patients presented to the dermatologist for persistent reticulated brown patches on the skin. These patients ranged in age from 6 to 22 years. All patients had tried various cleansing soaps and agents but were unable to remove the patches...
2016: Skinmed
Chen Han Shiau, Kuan Lun Pan, Sheng Jen Yu, Shaw Yi Yan, Moo Been Chang
No abstract text is available yet for this article.
November 10, 2016: Environmental Technology
Greyce Kelly Steinhorst Alcantara, Leandro Augusto Calixto, Luiz Alberto Beraldo de Moraes, Regina Helena Costa Queiroz, Anderson Rodrigo Moraes de Oliveira, Cristiane Masetto de Gaitani
Levetiracetam (LEV) is an antiepileptic drug that is clinically effective in generalized and partial epilepsy syndromes. The use of this drug has been increasing in clinical practice and intra- or -interindividual variability has been exhibited for special population. For this reason, bioanalytical methods are required for drug monitoring in biological matrices. So this work presents a dispersive liquid-liquid microextraction method followed by gas chromatography-mass spectrometry (DLLME-GC-MS) for LEV quantification in human plasma...
2016: Journal of Analytical Methods in Chemistry
Siti Noorhaniah Yusoh, Khatijah Aisha Yaacob
The optimization of etchant parameters in wet etching plays an important role in the fabrication of semiconductor devices. Wet etching of tetramethylammonium hydroxide (TMAH)/isopropyl alcohol (IPA) on silicon nanowires fabricated by AFM lithography is studied herein. TMAH (25 wt %) with different IPA concentrations (0, 10, 20, and 30 vol %) and etching time durations (30, 40, and 50 s) were investigated. The relationships between etching depth and width, and etching rate and surface roughness of silicon nanowires were characterized in detail using atomic force microscopy (AFM)...
2016: Beilstein Journal of Nanotechnology
Yuanying Fang, Zunhua Yang, Shankariah Gundeti, Jongkook Lee, Haeil Park
A series of GPR119 agonists based on a 5-nitropyrimidine scaffold bearing endo-azabicyclic substituents were synthesized and evaluated for their GPR119 agonistic activities. Most compounds exhibited much stronger EC50 values than that of oleoylethanolamide (OEA). Among them, derivatives from endo-azabicyclic alcohols displayed more potent GPR119 agonistic activities than compounds with endo-azabicyclic amines. Especially the optimized compounds (6, 7, 8, 12, 17) were shown to have potent biological activities and were identified as full agonists...
October 27, 2016: Bioorganic & Medicinal Chemistry
Ki-Woong Kim, Yong Lim Won, Dong Jin Park, Young Sun Kim, Eun Sil Jin, Sung Kwang Lee
We determined the toxicity of mixtures of ethyl acetate (EA), isopropyl alcohol (IPA), methyl ethyl ketone (MEK), toluene (TOL) and xylene (XYL) with half-maximal effective concentration (EC50) values obtained using human hepatocytes cells. According to these data, quantitative property-activity relationships (QPAR) models were successfully proposed to predict the toxicity of mixtures by multiple linear regressions (MLR). The leave-one-out cross validation method was used to find the best subsets of descriptors in the learning methods...
October 2016: Toxicological Research
Xiaotu Liu, Gang Yu, Zhiguo Cao, Bin Wang, Jun Huang, Shubo Deng, Yujue Wang, Hongbo Shen, Xue Peng
This study was undertaken to determine levels of halogenated flame retardants (HFRs) on skin surface to provide preliminary exposure estimates from dermal absorption. Skin wipes of palms, back-of-hands, and forearms were collected from 30 participants by using gauze pads soaked in isopropyl alcohol. Eight polybrominated diphenyl ethers (PBDEs), two novel brominated FRs, and two Dechlorane Plus (DPs) isomers were determined. BDE209, Decabromodiphenylethane (DBDPE), and 1, 2-Bis (2, 4, 6-tribromophenoxy) ethane (BTBPE) were most frequently detected...
November 3, 2016: Chemosphere
Udita Uday Ghosh, Monojit Chakraborty, Soham De, Suman Chakraborty, Sunando DasGupta
Exercising control over the evaporation of colloidal suspensions is pivotal to modulate the coating characteristics for specific uses wherein the interactions between the liquid, the particles and the substrate control the process. In the present study, the contact line dynamics of a receding colloidal liquid film comprising of particles of distinctly different sizes (nominal diameters 0.055 μm and 1μm, surface unmodified), during evaporation is analyzed. The role of the liquid polarity is also investigated by replacing the polar (water) liquid with a relatively non-polar liquid (Isopropyl alcohol) in the colloidal suspension...
November 1, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Hyun-Hee Lim, Ho-Sang Shin
As the popularity of body art including tattoo ink has increased, the safety associated with it has become an important interest. In this study, twenty volatile organic compounds (VOCs) and two aldehydes in tattoo inks were identified and quantified. Headspace and gas chromatography-mass spectrometry (HS GC-MS) for the VOCs and HS GC-MS based on derivatization with 2,2,2-trifluoroethylhydrazine (TFEH) for aldehydes was developed. Benzene, chloroform, toluene, ethylbenzene, m-xylene, p-xylene, o-xylene, propylbenzene, chlorobenzene, tert-butylbenzene, 1,3,5-trimethylbenzene, styrene, 1,2,4-trimethylbenzene, 2-chlorotoluene, 4-chlorotoluene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, 1,2-dichlorobenzene, 1,2,4-trichlorobenzene and isopropyl alcohol were detected with the concentration range of 0...
October 31, 2016: Journal of Chromatographic Science
Johnny P Mai, Matthieu Dumont, Christopher Rossi, Kevin Cleary, Joshua Wiedermann, Brian K Reilly
OBJECTIVES/HYPOTHESIS: A prototype tympanostomy tube, composed of polybutyl/methyl methacrylate-co-dimethyl amino ethyl methacrylate (PBM), was tested to 1) evaluate the effect of PBM tubes on rat dermis as a corollary for biocompatibility and (2) to observe the efficacy of dissolution with isopropyl alcohol (iPrOH) and ethanol (EtOH). STUDY DESIGN: Original animal experiment and bench testing. METHODS: A two-part study was conducted to assess biocompatible substance with inducible dissolvability as a critical characteristic for a newly engineered tympanostomy tube...
October 31, 2016: Laryngoscope
Xiaotu Liu, Gang Yu, Zhiguo Cao, Bin Wang, Jun Huang, Shubo Deng, Yujue Wang, Hongbo Shen, Xue Peng
This study was undertaken to determine levels of halogenated flame retardants (HFRs) on skin surface to provide preliminary exposure estimates from dermal absorption. Skin wipes of palms, back-of-hands, and forearms were collected from 30 participants by using gauze pads soaked in isopropyl alcohol. Eight polybrominated diphenyl ethers (PBDEs), two novel brominated FRs, and two Dechlorane Plus (DPs) isomers were determined. BDE209, Decabromodiphenylethane (DBDPE), and 1, 2-Bis (2, 4, 6-tribromophenoxy) ethane (BTBPE) were most frequently detected...
October 24, 2016: Chemosphere
Xiang Guo, Shan Zhou, Yanwei Wang, Jinlong Song, Huimin Wang, Delong Kong, Jie Zhu, Weiwei Dong, Mingxiong He, Guoquan Hu, Zhiyong Ruan
Laccases are green biocatalysts that possess attractive advantages for the treatment of resistant environmental pollutants and dye effluents. A putative laccase-like gene, laclK, encoding a protein of 29.3 kDa and belonging to the Cu-oxidase_4 superfamily, was cloned and overexpressed in Escherichia coli. The purified recombinant protein LaclK (LaclK) was able to oxidize typical laccase substrates such as 2,6-dimethoxyphenol and l-dopamine. The characteristic adsorption maximums of typical laccases at 330 nm and 610 nm were not detected for LaclK...
2016: PloS One
Jonas R M de Melo, Lidia Tiggeman, Katia Rezzadori, Juliana Steffens, Marshall Palliga, J Vladimir Oliveira, Marco Di Luccio, Marcus V Tres
This work investigates the use of ceramic membranes with different molecular weight cut-offs (MWCOs: 5, 10 and 20 kDa) to desolventize azeotropic solvent mixtures (ethanol/n-hexane and isopropyl alcohol/n-hexane) from soybean oil/azeotrope micelles. Results show that a decrease in the MWCO of a membrane and an increase in the solvent mass ratio in the mixture resulted in a significant reduction in the permeate flux. The 20 kDa membrane presented the highest permeate flux, 80 and 60 kg/m(2)h for the soybean oil/n-hexane/isopropyl alcohol and soybean oil/n-hexane/ethanol azeotropes, respectively, for an oil to solvent ratio of 1:3 (w/w)...
October 13, 2016: Environmental Technology
Daniel B Larsen, Allan R Petersen, Johannes R Dethlefsen, Ayele Teshome, Peter Fristrup
The molybdate-catalysed transfer hydrodeoxygenation (HDO) of benzyl alcohol to toluene driven by oxidation of the solvent isopropyl alcohol to acetone has been investigated by using a combination of experimental and computational methods. A Hammett study that compared the relative rates for the transfer HDO of five para-substituted benzylic alcohols was carried out. Density-functional theory (DFT) calculations suggest a transition state with significant loss of aromaticity contributes to the lack of linearity observed in the Hammett study...
October 10, 2016: Chemistry: a European Journal
Sajitha Narayanan, Mankadath Gokuldas
The silk protein from the web of Orthaga exvinacea was isolated, purified, and casted into films. This film was treated separately with methanol, acetone, ethyl acetate, and isopropyl alcohol in 50 % concentration for about 30 min. The treated films were thus dried in a desiccator and subjected to FTIR and TG-DTA analysis. The structural studies revealed that the organic solvents induce conformatory changes in the protein film, especially the most sensitive amide I (1650 cm(-1)) band. This band had shifted to lower wavenumber (1633-1636 cm(-1))...
October 2016: Journal of Chemical Biology
Saravanakumar Elangovan, Marcel Garbe, Haijun Jiao, Anke Spannenberg, Kathrin Junge, Matthias Beller
The first manganese-catalyzed hydrogenation of esters to alcohols has been developed. The combination of Mn(CO)5 Br with [HN(CH2 CH2 P(Et)2 )2 ] leads to a mixture of cationic and neutral Mn PNP pincer complexes, which enable the reduction of various ester substrates, including aromatic and aliphatic esters as well as diesters and lactones. Notably, related pincer complexes with isopropyl or cyclohexyl substituents showed very low activity.
September 30, 2016: Angewandte Chemie
Gregory I Peterson, Johanna J Schwartz, Di Zhang, Benjamin M Weiss, Mark A Ganter, Duane W Storti, Andrew J Boydston
We describe an efficient method to produce objects comprising spatially controlled and graded cross-link densities using vat photopolymerization additive manufacturing (AM). Using a commercially available diacrylate-based photoresin, 3D printer, and digital light processing (DLP) projector, we projected grayscale images to print objects in which the varied light intensity was correlated to controlled cross-link densities and associated mechanical properties. Cylinder and bar test specimens were used to establish correlations between light intensities used for printing and cross-link density in the resulting specimens...
October 11, 2016: ACS Applied Materials & Interfaces
Damon Borg, Anna Tverdovsky, Richard Stripp
Synthetic cannabinoids are a group of psychoactive compounds that mimic the effects of Δ9-tetrahydrocannabinol, the primary psychoactive constituent of marijuana (Cannabis sativa L). The Drug Enforcement Administration has classified many of the most common cannabinoids as Schedule 1 controlled substances. As a result, several novel synthetic cannabinoid series have emerged in the illicit drug market, including PINACA, FUBINACA, PB-22, AKB-48 and multiple derivatives of these compounds. Our laboratory developed and validated an analytical method for the analysis 32 synthetic cannabinoid metabolites in urine samples...
September 27, 2016: Journal of Analytical Toxicology
A M Api, D Belsito, S Bhatia, M Bruze, P Calow, M L Dagli, W Dekant, A D Fryer, L Kromidas, S La Cava, J F Lalko, A Lapczynski, D C Liebler, Y Miyachi, V T Politano, G Ritacco, D Salvito, T W Schultz, J Shen, I G Sipes, B Wall, D K Wilcox
The use of this material under current conditions is supported by existing information. This material was evaluated for genotoxicity, repeated dose toxicity, developmental and reproductive toxicity, local respiratory toxicity, phototoxicity/photoallergenicity, skin sensitization, as well as environmental safety. Data from the suitable read across analog 2-ethylhexanol (CAS # 104-76-7) show that this material is not genotoxic. Data from the suitable read across analog isopropyl alcohol (CAS # 67-63-0) show that this material does not have skin sensitization potential...
September 19, 2016: Food and Chemical Toxicology
Zhiqiang Zhao, Xinxia Liu, Xiumei Xing, Yao Lu, Yi Sun, Xiaoyan Ou, Xiaolin Su, Jun Jiang, Yarui Yang, Jingli Chen, Biling Shen, Yun He
PURPOSES: The objectives of this paper are to study the impact of low level isopropyl alcohol exposure on blood pressure and to explore its potential mechanism. METHODS: This cross-sectional study was based on a prospective occupational cohort in south China, which focusing on occupational risk factors related cardiovascular health problems. A total of 283 participants (200 low isopropyl alcohol exposed workers and 83 controls) was finally enrolled in this study...
2016: PloS One
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