28,393 results match your criteria acetone-

Advances in Automated Piston Liquid-Liquid Microextraction Technique.

J Chromatogr A 2021 Jun 9;1651:462330. Epub 2021 Jun 9.

Dow Canada ULC, PO Bag 16, Hwy 15, Fort Saskatchewan, AB, T8L 2P4, Canada; Australian Centre for Research on Separation Science (ACROSS), University of Tasmania, Private Bag 75 Hobart, 7001 SA. Electronic address:

A new automated micro liquid-liquid extraction technique was successfully developed. This novel syringe-based technique capitalizes on the advantages of vigorous fluid agitation and the shearing effect of two fluids with different properties to achieve high extraction efficiency. The technique is at least 20 times faster than mechanical shaking or sonication in achieving a similar recovery even with a hydrophilic probe molecule such as 1,4-dioxane in an aqueous medium. Read More

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Self-Powered Broadband Photodetector and Sensor Based on Novel Few-Layered Pd(PS) Nanosheets.

ACS Appl Mater Interfaces 2021 Jun 23. Epub 2021 Jun 23.

Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.

Optoelectronics and sensing devices are of enormous importance in our modern lives, which has propelled the scientific community to explore new two-dimensional (2D) nanomaterials to meet the requirements of future devices. Herein, we present the exfoliation of palladium thiophosphate (Pd(PS)) by mechanical shear force exfoliation. The Pd(PS)-based photoelectrochemical (PEC) device demonstrated self-powered broadband photodetection in the range of 385-940 nm with an unprecedented responsivity of 2 A W and a specific detectivity of about 8. Read More

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Assessment of the potential vaping-related exposure to carbonyls and epoxides using stable isotope-labeled precursors in the e-liquid.

Arch Toxicol 2021 Jun 22. Epub 2021 Jun 22.

ABF Analytisch-Biologisches Forschungslabor GmbH, Semmelweisstrasse 5, 82152, Planegg, Germany.

The formation of carbonyls and epoxides in e-cigarette (EC) aerosol is possible due to heating of the liquid constituents. However, high background levels of these compounds have inhibited a clear assessment of exposure during use of ECs. An EC containing an e-liquid replaced with 10% of C-labeled propylene glycol and glycerol was used in a controlled use clinical study with 20 EC users. Read More

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Verrucomicrobial methanotrophs grow on diverse C3 compounds and use a homolog of particulate methane monooxygenase to oxidize acetone.

ISME J 2021 Jun 22. Epub 2021 Jun 22.

Department of Biological Sciences and Biotechnology, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju, 28644, Republic of Korea.

Short-chain alkanes (SCA; C2-C4) emitted from geological sources contribute to photochemical pollution and ozone production in the atmosphere. Microorganisms that oxidize SCA and thereby mitigate their release from geothermal environments have rarely been studied. In this study, propane-oxidizing cultures could not be grown from acidic geothermal samples by enrichment on propane alone, but instead required methane addition, indicating that propane was co-oxidized by methanotrophs. Read More

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Gas chromatography-mass spectrometry analysis of organic acid profiles in human serum: a protocol of direct ultrasound-assisted derivatization.

Rapid Commun Mass Spectrom 2021 Jun 22:e9149. Epub 2021 Jun 22.

Department of Nutrition and Food Hygiene, Public Health College, Harbin Medical University, Harbin, P. R. China.

Rationale: Low-molecular weight organic acids that generally contain one to three carboxyl groups are involved in many important biological processes; therefore, it is important to develop a quantitative method for analyzing organic acids in serum in order to allow evaluation of metabolic changes. In this study, we evaluated a protocol for detecting 26 organic acids in serum based on ultrasound-assisted derivatization by gas chromatography-mass spectrometry (GC-MS).

Methods: Serum samples were prepared using ultrasound-assisted silane derivatization before GC-MS analysis to quantify concentrations of organic acids. Read More

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Evaluation of 2%, 1%, and 0.5% parthenium acetone extracts to diagnose parthenium contact allergy.

Contact Dermatitis 2021 Jun 21. Epub 2021 Jun 21.

Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India.

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Synthesis of Carbonato- and Doubly Oxido-Bridged Diruthenium(III,IV) Complex and Reactions with Cations.

Inorg Chem 2021 Jun 21. Epub 2021 Jun 21.

Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554 Japan.

Doubly oxido-bridged transition metal moieties, {M(μ-O)}, play important roles as oxidation reaction centers in nature. This work features a diruthenium(III,IV) complex with a doubly oxido-bridged core {Ru(μ-O)} with a carbonato bridged between the two ruthenium centers, M[{Ru(ebpma)}(μ-O)(μ-OCO)](PF) (M[](PF); , ebpma; ethylbis(2-pyridymethyl)amine), and explores the interactions of this complex with cations (H and M). M[](PF) was formed via reactions of a singly oxido-bridged complex, [{RuCl(ebpma)}(μ-O)]PF(CH)CO, with MCO (M = K, Na) or with CO(), adjusted to around pH 12 with NaOH(aq. Read More

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Chemical contaminants in Brazilian drinking water: a systematic review.

J Water Health 2021 Jun;19(3):351-369

Chemical Engineering Department, Federal University of Rio Grande do Sul, Luiz Englert s/n°, downtown, 90040-040, Porto Alegre-RS, Brazil E-mail:

The goals of this research are to evaluate which chemical contaminations were detected in Brazil's drinking water reported in papers published from 2012 to 2019, to propose guideline values for emerging contaminants and assess which are the priority parameters from a health risk perspective. The methodology used was a systematic review. The chemical contaminants quantified were evaluated according to Brazilian drinking-water standards, and Guideline Values were proposed for emerging pollutants using conservative endpoints from NOAEL and LOAEL available in literature. Read More

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Parallel bioreactor system for accessible and reproducible anaerobic culture.

Access Microbiol 2021 15;3(4):000225. Epub 2021 Apr 15.

School of Biosciences, RAPID Group, University of Kent, Canterbury, CT2 7NJ, UK.

When working with anaerobic bacteria it is important to have the capability to perform parallel bioreactor growth experiments that are both controllable and reproducible, although capital and consumables costs for commercially available systems are often prohibitively high. Hence, a three-vessel parallel bioreactor system was designed and constructed that has the capabilities for batch and fed batch processes and can also be set up for continuous culture at a fraction of the cost of commercial systems. This system carries over many of the same functionalities of those systems with a higher price point of entry, including in-line monitoring of temperature, pH, and redox poise. Read More

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Discerning the Metal Doping Effect on Surface Redox and Acidic Properties in a MoVTeNbO for Propa(e)ne Oxidation.

ACS Omega 2021 Jun 2;6(23):15279-15291. Epub 2021 Jun 2.

Instituto Mexicano del Petróleo, Dirección de Investigación en Transformación de Hidrocarburos, Eje Central Lázaro Cárdenas Norte 152, C.P. 07730 Ciudad de México, Mexico.

Adding a small quantity of K or Bi to a MoVTeNbO via impregnation with inorganic solutions modifies its surface acid and redox properties and its catalytic performance in propa(e)ne partial oxidation to acrylic acid (AA) without detriment to its pristine crystalline structure. Bi-doping encourages propane oxydehydrogenation to propene, thus enlarging the net production rate of AA up to 35% more. The easier propane activation/higher AA production over the Bi-doped catalyst is ascribed to its higher content of surface V leading to a larger amount of total V species, the isolation site effect of NbO species on V, and its higher Lewis acidity. Read More

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Chemical Analysis and Anthelmintic Activity Against of Nordic Bark Extracts .

Front Vet Sci 2021 4;8:666924. Epub 2021 Jun 4.

NIBIO Norwegian Institute of Bioeconomy Research, Ås, Norway.

Helminth parasitic infections are common in small ruminants in Norway; infection is usually treated with anthelmintic drugs, but anthelmintic resistance is an increasing problem. It is necessary to identify strategies to reduce the use of anthelmintic drugs and mitigate the impact of anthelmintic resistance. Condensed tannin (CT)-rich forages have been shown to reduce the helminth burden in small ruminants, but these forages have limited cultivation potential in Scandinavia. Read More

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A Self-Powered Nanogenerator for the Electrical Protection of Integrated Circuits from Trace Amounts of Liquid.

Nanomicro Lett 2019 Dec 14;12(1). Epub 2019 Dec 14.

Department of Mechanics and Mechatronics Engineering, Centre for Advanced Materials Joining, University of Waterloo, Waterloo, ON, N2L 3G1, Canada.

With the increase in the use of electronic devices in many different environments, a need has arisen for an easily implemented method for the rapid, sensitive detection of liquids in the vicinity of electronic components. In this work, a high-performance power generator that combines carbon nanoparticles and TiO nanowires has been fabricated by sequential electrophoretic deposition (EPD). The open-circuit voltage and short-circuit current of a single generator are found to exceed 0. Read More

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December 2019

Assessing flammable storage cabinets as sources of VOC exposure in laboratories using real-time direct reading wireless detectors.

J Chem Health Saf 2018 Sep;25(5):2-9

NIOSH (National Institute for Occupational Safety and Health), 1090 Tusculum Ave., Cincinnati, OH 45226, United States.

Herein we present the results of measurements using wireless direct-reading photoionization detector-based gas sensors to quantify concentrations of vapors of volatile organic compounds (VOCs) in and around flammable storage cabinets containing common organic solvents, including acetone, dichloromethane, trichloroethylene, and benzene. Such cabinets are commonly employed in laboratories to contain flammable liquids. A sensor array was deployed in a series of flammable storage cabinets in working laboratories. Read More

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September 2018

Effect analysis of pore wall thickness, pore size, and functional group of activated carbon on adsorption behavior based on molecular simulation.

Environ Sci Pollut Res Int 2021 Jun 20. Epub 2021 Jun 20.

Jiangsu Provincial Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Changzhou, 213164, Jiangsu, China.

To effectively investigate the influence of activated carbon on the adsorption of volatile organic compounds (VOCs), physical and chemical factors of activated carbon including pore wall thickness, pore size, and functional groups were studied using grand canonical Monte Carlo (GCMC) simulation. In addition, benzene and acetone were taken as two representative components of VOCs. Simulation results was presented by the changes in characteristics of benzene and acetone. Read More

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Antioxidant action and enzyme activity modulation by bioaccessible polyphenols from jambolan (Syzygium cumini (L.) Skeels).

Food Chem 2021 Jun 11;363:130353. Epub 2021 Jun 11.

Departament of Nutrition, Federal University of Piauí, Ministro Petrônio Portela Campus, Ininga, Teresina, Piauí, Brazil. Electronic address:

Jambolan is rich in antioxidant polyphenols; however, the bioactivity of these compounds remains poorly investigated. We compared changes in polyphenols and antioxidant capacity by ABTS and FRAP assays of jambolan pulp during in vitro digestion and chemical extraction and evaluated the effects of these changes on oxidative stress in wild and mutant Saccharomyces cerevisiae. Digestion and chemical extraction were performed with enzyme saline solutions, deionized water, and 50% (v/v) aqueous acetone solution. Read More

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Rapid quantification of dissolved solids and bioactives in dried root vegetable extracts using near infrared spectroscopy.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Jun 11;261:120074. Epub 2021 Jun 11.

University of Zagreb, Faculty of Food Technology and Biotechnology, Pierottijeva 6, 10000 Zagreb, Croatia. Electronic address:

Artificial neural networks (ANN) were developed for prediction of total dissolved solids, polyphenol content and antioxidant capacity of root vegetables (celery, fennel, carrot, yellow carrot, purple carrot and parsley) extracts prepared from the (i) fresh vegetables, (ii) vegetables dried conventionally at 50 °C and 70 °C, and (iii) the lyophilised vegetables. Two types of solvents were used: organic solvents (acetone mixtures and methanol mixtures) and water. Near-infrared (NIR) spectra were recorded for all samples. Read More

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Volatilome of Aleppo Pine litter over decomposition process.

Ecol Evol 2021 Jun 15;11(11):6862-6880. Epub 2021 May 15.

CNRS Aix Marseille Univ IRD Avignon Univ IMBE Marseille France.

Biogenic Volatile Organic Compounds (BVOC) are largely accepted to contribute to both atmospheric chemistry and ecosystem functioning. While the forest canopy is recognized as a major source of BVOC, emissions from plant litter have scarcely been explored with just a couple of studies being focused on emission patterns over litter decomposition process. The aim of this study was to quantitatively and qualitatively characterize BVOC emissions (C-C) from litter, one of the major Mediterranean conifer species, over a 15-month litter decomposition experiment. Read More

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Additive Manufacturing for Occupational Hygiene: A Comprehensive Review of Processes, Emissions, & Exposures.

J Toxicol Environ Health B Crit Rev 2021 Jun 17:1-50. Epub 2021 Jun 17.

North-West University, Occupational Hygiene and Health Research Initiative, Potchefstroom, South Africa.

This comprehensive review introduces occupational (industrial) hygienists and toxicologists to the seven basic additive manufacturing (AM) process categories. Forty-six articles were identified that reported real-world measurements for all AM processes, except sheet lamination. Particles released from powder bed fusion (PBF), material jetting (MJ), material extrusion (ME), and directed energy deposition (DED) processes exhibited nanoscale to submicron scale; real-time particle number (mobility sizers, condensation nuclei counters, miniDiSC, electrical diffusion batteries) and surface area monitors (diffusion chargers) were generally sufficient for these processes. Read More

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The antibacterial activity of Libanstin from Ilex paraguariensis (Yerba Mate).

Fitoterapia 2021 Jun 15;153:104962. Epub 2021 Jun 15.

Department of Biology, Faculty of Arts & Sciences, University of Balamand, Lebanon. Electronic address:

Infectious diseases are reported to be one of the major causes of death in the world. The World Health Organization (WHO) warns of an increase in the deaths number because of antibacterial resistance. Lately, a trend towards searching for new active antibacterial compounds in plants has been observed. Read More

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Controlled Assembly of Luminescent Lanthanide-Organic Frameworks via Post-Treatment of 3D-Printed Objects.

Nanomicro Lett 2020 Oct 31;13(1):15. Epub 2020 Oct 31.

State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, People's Republic of China.

Complex multiscale assemblies of metal-organic frameworks are essential in the construction of large-scale optical platforms but often restricted by their bulk nature and conventional techniques. The integration of nanomaterials and 3D printing technologies allows the fabrication of multiscale functional architectures. Our study reports a unique method of controlled 3D assembly purely relying on the post-printing treatment of printed constructs. Read More

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October 2020

Extraction and identification of biologically important proteins from the medicinal plant God's crown (Phaleria macrocarpa).

J Food Biochem 2021 Jun 17:e13817. Epub 2021 Jun 17.

Analytical Biochemistry Research Centre (ABrC), Universiti Sains Malaysia (USM), Bayan Lepas, Penang, Malaysia.

The fruit and leaf of God's crown (Phaleria macrocarpa) have been traditionally used to treat a wide variety of diseases. However, the proteins of this tropical plant are still heavily understudied. Three protein extraction methods; phenol (Phe), trichloroacetic acid (TCA)-acetone-phenol (TCA-A-Phe), and ultrasonic (Ult) were compared on the fruit and leaf of P. Read More

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Valorization of Almond () by Obtaining Bioactive Compounds.

Front Nutr 2021 31;8:663953. Epub 2021 May 31.

Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Departamento de Alimentos, Laboratorio de Reologia, San Nicolás de los Garza, Mexico.

The Capulin almond is a seed of the (var. ) that belongs to the family. In this study, the valorization of the Capulin almond was performed by extracting antioxidants contained in the shell, paste, and oil (extracted by manual cold pressing process) of treated with methanol, ethanol, acetone, and acidified water (pH 4) in a ratio of 1:5 (w/v). Read More

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Validated HPTLC and antioxidant activities for quality control of catechin in a fermented tea ( var. assamica).

Food Sci Nutr 2021 Jun 4;9(6):3228-3239. Epub 2021 May 4.

Department of Pharmaceutical Sciences Faculty of Pharmacy Chiang Mai University Chiang Mai Thailand.

Miang, a Thai traditional fermented tea ( var. assamica), is exploited as nutraceutical and cosmeceutical ingredients despite limited standardization studies. Thus, this research aimed to develop a simple and rapid method for miang quality control using catechin and high-performance thin-layer chromatography (HPTLC) validated according to the International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH) and the Association of Official Analytical Collaboration (AOAC). Read More

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Ionic liquid-based in situ product removal design exemplified for an acetone-butanol-ethanol fermentation.

Biotechnol Prog 2021 Jun 15:e3183. Epub 2021 Jun 15.

Department of Chemical and Biochemical Engineering, Technical University of Denmark, Lyngby, Denmark.

Selecting an appropriate separation technique is essential for the application of in situ product removal (ISPR) technology in biological processes. In this work, a three-stage systematic design method is proposed as a guide to integrate ionic liquid (IL)-based separation techniques into ISPR. This design method combines the selection of a suitable ISPR processing scheme, the optimal design of an IL-based liquid-liquid extraction (LLE) system followed by process simulation and evaluation. Read More

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A Preliminary Nuclear Magnetic Resonance Metabolomics Study Identifies Metabolites That Could Serve as Diagnostic Markers of Major Depressive Disorder.

Curr Neuropharmacol 2021 Jun 10. Epub 2021 Jun 10.

Pharmacotherapeutics Unit, Department of Medicine, Faculty of Medicine and Health Sciences, Universiti Putra , Malaysia.

Background: Evaluation of metabolites that are directly involved in the physiological process, few steps short of phenotypical manifestation, remains vital at unraveling the biological moieties involved in the development of the (MDD) and in predicting its treatment outcome.

Methodology: Eight bio-fluids ( 8 urine and 8 serum samples) obtained from consenting healthy controls (HC), twenty five (25) biofluids from first episode treatment naïve MDD (TNMDD) patients and twenty (22) biofluids from treatment naïve MDD patients 2 weeks after SSRI treatment (TWMDD) were analysed for metabolites using proton nuclear magnetic resonance (1HNMR) spectroscopy. The evaluation of patients' samples was carried out using Partial least squares discriminant analysis (PLSDA) and Orthogonal Partial Least Square-Discriminant Analysis (OPLSDA) models. Read More

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A Diverse Array of C-C Bonds Formed at a Tantalum Metal Center.

Inorg Chem 2021 Jun 14. Epub 2021 Jun 14.

Department of Chemistry, University of California, Berkeley, California 94720, United States.

We demonstrate the formation of a diverse array of organic and organometallic products containing newly formed C-C bonds via successive methyl transfers from di-, tri-, and tetramethyl Ta(V) precursors to unsaturated small molecule substrates under mild conditions. The reactions of Ta(V) methyl complexes - [HB(Im)]TaMeX (X = Me, Cl; Im = imidazole, Mes = 2,4,6-trimethylphenyl) with CO led to oxo enolate Ta(V) products, in which the enolate ligands were constructed from Ta-Me groups and two equivalents of CO. Similarly, the reaction of with CNXyl yielded an imido enamine Ta(V) product. Read More

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Keyto App and Device versus WW App on Weight Loss and Metabolic Risk in Adults with Overweight or Obesity: A Randomized Trial.

Obesity (Silver Spring) 2021 Jun 14. Epub 2021 Jun 14.

University of British Columbia, Kelowna, BC, Canada.

Objective: To determine whether a Mediterranean-style ketogenic diet mobile health application (app) with breath acetone biofeedback is superior to a calorie-restricted low-fat diet app in promoting weight loss.

Methods: Participants (N = 155) with overweight/obesity (mean±SD: 41±11 y, BMI = 34±5 kg/m , 71% female) were randomized to one of the interventions that were delivered entirely via app. Participants received a wireless scale and were instructed to take daily weight measurements. Read More

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Qualitative and quantitative determination of trace aldehydes and ketones in food preservative propionic acid for quality improvement.

Anal Methods 2021 Jun 14. Epub 2021 Jun 14.

College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China.

Aiming at the difficulty in qualitative and quantitative analysis of trace compositions in food preservative propionic acid, the trace compositions and the key components influencing the total aldehyde content in propionic acid were analyzed by gas chromatography-mass spectrometry (GC-MS), high performance liquid chromatography (HPLC) and gas chromatography (GC) in this paper. The results show that the food preservative propionic acid contains 18 trace compositions. The main compositions affecting the total aldehyde content in propionic acid are acetaldehyde, propionaldehyde, 1-cyclopropyl-1-propanone and 2-methyl-2-pentenal, which account for ∼90% of the total aldehyde content in propionic acid. Read More

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Trace-Level Humidity Sensing from Commercial Organic Solvents and Food Products by an AIE/ESIPT-Triggered Piezochromic Luminogen and ppb-Level "OFF-ON-OFF" Sensing of Cu: A Combined Experimental and Theoretical Outcome.

ACS Omega 2021 Jun 24;6(22):14104-14121. Epub 2021 May 24.

Surface Engineering & Tribology Group, CSIR-Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur 713209, West Bengal, India.

Selective and sensitive moisture sensors have attracted immense attention due to their ability to monitor the humidity content in industrial solvents, food products, ., for regulating industrial safety management. Herein, a hydroxy naphthaldehyde-based piezochromic luminogen, namely, 1-{[(2-hydroxyphenyl)imino]methyl}naphthalen-2-ol (), has been synthesized and its photophysical and molecular sensing properties have been investigated by means of various spectroscopic tools. Read More

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Sensitive Quantification of Nicotine in Bronchoalveolar Lavage Fluid by Acetone Precipitation Combined With Isotope-Dilution Liquid Chromatography-Tandem Mass Spectrometry.

ACS Omega 2021 Jun 25;6(22):13962-13969. Epub 2021 May 25.

Tobacco and Volatiles Branch, Division of Laboratory Sciences, National Center for Environmental Health, U.S. Centers for Disease Control and Prevention (CDC), 4770 Buford Highway, Mail Stop S103-3, Atlanta, Georgia 30341, United States.

The United States experienced an outbreak of e-cigarette, or vaping, product use-associated lung injury (EVALI) that began in August 2019. Patient diagnosis and treatment sometimes involved bronchoscopy and collection of the bronchoalveolar lavage (BAL) fluid. Although this matrix has been useful for understanding some chemical exposures in the lungs, no methods existed for measuring the nicotine content. Read More

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