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Katsuyama Y, Li Y, Uemura S, Yang Z, Anderson M, Wang C, Lin CW, Li Y, Kaner RB. Reprecipitation: A Rapid Synthesis of Micro-Sized Silicon-Graphene Composites for Long-lasting Lithium-Ion Batteries. ACS Appl Mater Interfaces 2024. [PMID: 38427784 DOI: 10.1021/acsami.3c18846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/03/2024]
Abstract
Silicon microparticles (SiMPs) have gained significant attention as a lithium-ion battery anode material due to their 10 times higher theoretical capacity compared to conventional graphite anodes as well as their much lower production cost than silicon nanoparticles (SiNPs). However, SiMPs have suffered from poorer cycle life relative to SiNPs because their larger size makes them more susceptible to volume changes during charging and discharging. Creating a wrapping structure in which SiMPs are enveloped by carbon layers has proven to be an effective strategy to significantly improve the cycling performance of SiMPs. However, the synthesis processes are complex and time-/energy-consuming and therefore not scalable. In this study, a wrapping structure is created by using a simple, rapid, and scalable "modified reprecipitation method". Graphene oxide (GO) and SiMP dispersion in tetrahydrofuran is injected into n-hexane, in which GO and SiMP by themselves cannot disperse. GO and SiMP therefore aggregate and precipitate immediately after injection to form a wrapping structure. The resulting SiMP/GO film is laser scribed to reduce GO to a laser-scribed graphene (LSG). Simultaneously, SiOx and SiC protection layers form on the SiMPs through the laser process, which alleviates severe volume change. Owing to these desirable characteristics, the modified reprecipitation method successfully doubles the cycle life of SiMP/graphene composites compared to the simple physically mixing method (50.2% vs. 24.0% retention at the 100th cycle). The modified reprecipitation method opens a new synthetic strategy for SiMP/carbon composites.
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Affiliation(s)
- Yuto Katsuyama
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Yang Li
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Sophia Uemura
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Zhiyin Yang
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Mackenzie Anderson
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Chenxiang Wang
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Cheng-Wei Lin
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
| | - Yuzhang Li
- Department of Chemical and Biomolecular Engineering, University of California Los Angeles, Los Angeles, California 90095-1569, United States
- California NanoSystems Institute (CNSI), University of California, Los Angeles (UCLA), Los Angeles, California 90095, United States
| | - Richard B Kaner
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1569, United States
- California NanoSystems Institute (CNSI), University of California, Los Angeles (UCLA), Los Angeles, California 90095, United States
- Department of Materials Science and Engineering, University of California, Los Angeles (UCLA), Los Angeles, California 90095, United States
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2
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Zaratin L, Boaretto C, Schianca RC, Hinkal G, Grignani E, Cottica D. Accurate low-dose exposure assessment of benzene and monoaromatic compounds by diffusive sampling: sampling and analytical method validation according to ISO 23320 for radiello® samplers packed with activated charcoal. Front Public Health 2023; 11:1271550. [PMID: 38026316 PMCID: PMC10679414 DOI: 10.3389/fpubh.2023.1271550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 10/17/2023] [Indexed: 12/01/2023] Open
Abstract
The research study aimed at providing an accurate low-dose benzene exposure assessment method, by validating diffusive monitoring techniques for benzene personal exposure measurements at workplaces where benzene concentrations are expected in the low ppb range, such as in the present-day chemical, petrochemical, foundry, and pharmaceutical industry. The project was aimed at addressing the need for a robust and fully validated method to perform personal exposure measurements considering that the occupational exposure limit value for benzene is going to be significantly lowered in the next few years. Diffusive sampling offers a reliable alternative to pumped sampling methods, intrinsic safety in potentially explosive atmospheres, lightness, and ease of use. In this study, the radiello® diffusive sampler, with the packed activated charcoal RAD130 adsorbing substrate [suitable for solvent desorption and analysis by high-resolution gas chromatography-flame ionization detection (HRGC-FID)], was used. The experiments have been conducted following the ISO 23320 standard in the range from 0.005 to 0.1 ppm (16 to 320 μg/m3), yielding a full validation of the sampling and analytical method. The sampler performances have fulfilled all requisites of the ISO 23320 standard, in particular: bias due to the selection of a non-ideal sorbent is lower than 10% (no significant back diffusion of benzene due to concentration change in the atmosphere); bias due to storage of samples for up to 2 months is lower than 10%; nominal uptake rate for benzene on RAD130 is 74.65 mL/min; and expanded uncertainty of the sampling and analytical method is 20.6%. The sampling and analytical method is therefore fit-for-purpose for the personal exposure measurements aimed at testing compliance with occupational exposure limit values for benzene. The method is also fit for short-duration exposure monitoring related to specific tasks, and other volatile organic compounds, usually found in the same workplaces, such as aliphatic and aromatic hydrocarbons and some oxygenated compounds, have also been studied. In particular, n-hexane and isopropyl benzene, whose classification is currently under revision, can be efficiently monitored by this technique.
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Affiliation(s)
- Laura Zaratin
- Environmental Research Centre, Istituti Clinici Scientifici Maugeri SpA SB, Perarolo di Vigonza, Italy
| | - Caterina Boaretto
- Environmental Research Centre, Istituti Clinici Scientifici Maugeri SpA SB, Perarolo di Vigonza, Italy
| | | | | | - Elena Grignani
- Environmental Research Centre, Istituti Clinici Scientifici Maugeri SpA SB, Perarolo di Vigonza, Italy
| | - Danilo Cottica
- Environmental Research Centre, Istituti Clinici Scientifici Maugeri SpA SB, Perarolo di Vigonza, Italy
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3
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Song J, Zhu Z, Liu L. Mechanism of Hexane Displaced by Supercritical Carbon Dioxide: Insights from Molecular Simulations. Molecules 2022; 27. [PMID: 36500433 DOI: 10.3390/molecules27238340] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 11/21/2022] [Accepted: 11/23/2022] [Indexed: 12/02/2022]
Abstract
Supercritical carbon dioxide (sCO2) has great potential for displacing shale oil as a result of its high solubility and low surface tension and viscosity, but the underlying mechanisms have remained unclear up to now. By conducting equilibrium molecular dynamics (EMD) simulations, we found that the displacing process could be divided into three steps: the CO2 molecules were firstly injected in the central region of shale slit, then tended to adsorb on the SiO2-OH wall surface and mix with hexane, resulting in loose hexane layer on the shale surface, and finally displaced hexane from the wall due to strong interactions between CO2 and wall. In that process, the displacing velocity and efficiency of hexane exhibit parabolic and increased trends with pressure, respectively. To gain deep insights into this phenomenon, we further performed non-equilibrium molecular dynamics (NEMD) simulations and found that both the Onsager coefficients of CO2 and hexane were correlated to increase with pressure, until the diffusion rate of hexane being suppressed by the highly dense distribution of CO2 molecules at 12 MPa. The rapid transportation of CO2 molecules in the binary components (CO2 and hexane) actually promoted the hexane diffusion, which facilitated hexane flowing out of the nanochannel and subsequently enhanced oil recovery efficiency. The displacing process could occur effectively at pressures higher than 7.5 MPa, after which the interaction energies of the CO2-wall were stronger than that of the hexane-wall. Taking displacing velocity and efficiency and hexane diffusion rate into consideration, the optimal injection pressure was found at 10.5 MPa in this work. This study provides detailed insights into CO2 displacing shale oil and is in favor of deepening the understanding of shale oil exploitation and utilization.
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Kaewmuangmoon J, Charoonpatrapong K, Janebodin K. Cytotoxicity of Propolis Extracts obtained using Dichloromethane and Hexane Solvent on Human Salivary Gland Tumor Cell Line. J Int Soc Prev Community Dent 2022; 12:506-512. [PMID: 36532325 PMCID: PMC9753917 DOI: 10.4103/jispcd.jispcd_303_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 04/10/2022] [Accepted: 06/08/2022] [Indexed: 01/25/2023] Open
Abstract
AIM This in vitro study aimed to investigate the effect of propolis extracts from two different solvents on human submandibular salivary gland (HSG) tumor cell line. MATERIALS AND METHODS Propolis was extracted by dichloromethane (DCM) and hexane (HEX). Crude extracts were prepared from 6.25 to 200 µg/mL in Dulbecco's modified eagle medium without serum. Flavonoid and total phenolic contents of crude extracts were measured using a modified colorimetric method. The cytotoxicity was evaluated by 3-[4, 5-dimethylthiazol-2-yl]-2,5 diphenyl-tetrazolium (MTT) assay and lactate dehydrogenase (LDH) release assay. The statistics were analyzed by independent sample t-test. RESULTS Propolis extracts obtained using DCM and HEX exhibited comparable % yield (38.58 and 38.25) and physical characteristics and different amounts of flavonoid (0.439 ± 0.02 and 0.250 ± 0.01 mg catechin/g sample) and total phenolic compounds (3.759 ± 0.03 and 1.618 ± 0.03 mg gallic acid equivalents/g sample). The DCM group at 25, 50, 100, and 200 µg/mL as well as the HEX group at 50, 100, and 200 µg/mL significantly displayed a decrease in % cell viability and an increase in % cytotoxicity, compared with the untreated control group (P < 0.05). The DCM group showed the half-maximal inhibitory concentration (IC50) of MTT (42.93 ± 2.70) and LDH (34.94 ± 0.22). The HEX group showed the IC50 of MTT (61.30 ± 5.39) and LDH (42.32 ± 1.00). Propolis extracts obtained using both DCM and HEX are effective to inhibit HSG viability. CONCLUSION Regarding to the cell morphological observation, MTT and LDH assays, propolis extracts obtained using DCM and HEX exhibited the cytotoxic effect on HSG tumor cell line. Based on our knowledge, this research demonstrates the first preliminary result suggesting propolis as a natural product of choice for salivary gland cancer prevention and therapy.
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Affiliation(s)
| | | | - Kajohnkiart Janebodin
- Department of Anatomy, Faculty of Dentistry, Mahidol University, Bangkok, Thailand,Address for correspondence: Dr. Kajohnkiart Janebodin, Department of Anatomy, Faculty of Dentistry, Mahidol University, 6 Yothi Road, Phayathai, Ratchathewi, Bangkok 10400, Thailand. E-mail:
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Cravotto C, Fabiano-Tixier AS, Claux O, Abert-Vian M, Tabasso S, Cravotto G, Chemat F. Towards Substitution of Hexane as Extraction Solvent of Food Products and Ingredients with No Regrets. Foods 2022; 11:3412. [PMID: 36360023 PMCID: PMC9655691 DOI: 10.3390/foods11213412] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 10/20/2022] [Accepted: 10/24/2022] [Indexed: 08/13/2023] Open
Abstract
Hexane is a solvent used extensively in the food industry for the extraction of various products such as vegetable oils, fats, flavours, fragrances, colour additives or other bioactive ingredients. As it is classified as a "processing aid", it does not have to be declared on the label under current legislation. Therefore, although traces of hexane may be found in final products, especially in processed products, its presence is not known to consumers. However, hexane, and in particular the n-hexane isomer, has been shown to be neurotoxic to humans and has even been listed as a cause of occupational diseases in several European countries since the 1970s. In order to support the European strategy for a toxic-free environment (and toxic-free food), it seemed important to collect scientific information on this substance by reviewing the available literature. This review contains valuable information on the nature and origin of the solvent hexane, its applications in the food industry, its toxicological evaluation and possible alternatives for the extraction of natural products. Numerous publications have investigated the toxicity of hexane, and several studies have demonstrated the presence of its toxic metabolite 2,5-hexanedione (2,5-HD) in the urine of the general, non-occupationally exposed population. Surprisingly, a tolerable daily intake (TDI) has apparently never been established by any food safety authority. Since hexane residues are undoubtedly found in various foods, it seems more than necessary to clearly assess the risks associated with this hidden exposure. A clear indication on food packaging and better information on the toxicity of hexane could encourage the industry to switch towards one of the numerous other alternative extraction methods already developed.
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Affiliation(s)
- Christian Cravotto
- GREEN Extraction Team, INRAE, UMR 408, Avignon University, F-84000 Avignon, France
| | | | - Ombéline Claux
- GREEN Extraction Team, INRAE, UMR 408, Avignon University, F-84000 Avignon, France
| | - Maryline Abert-Vian
- GREEN Extraction Team, INRAE, UMR 408, Avignon University, F-84000 Avignon, France
| | - Silvia Tabasso
- Department of Drug Science and Technology, University of Turin, Via P. Giuria 9, 10125 Turin, Italy
| | - Giancarlo Cravotto
- Department of Drug Science and Technology, University of Turin, Via P. Giuria 9, 10125 Turin, Italy
| | - Farid Chemat
- GREEN Extraction Team, INRAE, UMR 408, Avignon University, F-84000 Avignon, France
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González-Galán C, de Fez-Febré M, Giancola S, González-Cobos J, Vidal-Ferran A, Galán-Mascarós JR, Balestra SRG, Calero S. Separation of Volatile Organic Compounds in TAMOF-1. ACS Appl Mater Interfaces 2022; 14:30772-30785. [PMID: 35793095 PMCID: PMC9679997 DOI: 10.1021/acsami.2c05223] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Separation of volatile organic compounds is one of the most studied processes in industry. TAMOF-1 is a homochiral metal-organic framework with a crystalline network of interconnected ≈1 nm channels and has high thermal and chemical stability. Thanks to these features, it can resolve racemic mixtures of chiral drugs as a chiral stationary phase in chromatography. Interestingly, the particular shape and size of its channels, along with the presence of metallic centers and functional groups, allow establishing weak but significant interactions with guest molecules. This opens interesting possibilities not only to resolve racemates but also to separate other organic mixtures, such as saturated/unsaturated and/or linear/branched molecules. In search of these applications, we have studied the separation of volatile organic compounds in TAMOF-1. Monte Carlo simulations in the grand-canonical ensemble have been carried out to evaluate the separation of the selected molecules. Our results predict that TAMOF-1 is able to separate xylene isomers, hexane isomers, and benzene-cyclohexane mixtures. Experimental breakthrough analysis in the gas phase and also in the liquid phase confirms these predictions. Beds of TAMOF-1 are able to recognize the substitution in xylenes and the branching in hexanes, yielding excellent separation and reproducibility, thanks to the chemical and mechanical features of this material.
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Affiliation(s)
- Carmen González-Galán
- Department
of Physical, Chemical, and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera Km 1, ES-41013 Seville, Spain
| | - Mabel de Fez-Febré
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, ES-43007 Tarragona, Spain
- Departament
de Química Física I Inorgànica, Universitat Rovira i Virgili, Marcel. Lí Domingo 1, 43007 Tarragona, Spain
| | - Stefano Giancola
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, ES-43007 Tarragona, Spain
| | - Jesús González-Cobos
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, ES-43007 Tarragona, Spain
| | - Anton Vidal-Ferran
- Catalan
Institution for Research and Advanced Studies (ICREA), Passeig Lluis Companys 23, ES-08010 Barcelona, Spain
- Department
of Inorganic and Organic Chemistry, University
of Barcelona, C. Martí
i Franquès 1-11, 08028 Barcelona, Spain
| | - José Ramón Galán-Mascarós
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, ES-43007 Tarragona, Spain
- Catalan
Institution for Research and Advanced Studies (ICREA), Passeig Lluis Companys 23, ES-08010 Barcelona, Spain
| | - Salvador R. G. Balestra
- Department
of Physical, Chemical, and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera Km 1, ES-41013 Seville, Spain
- Instituto
de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones
Científicas (ICMM-CSIC), c/ Sor Juana Inés de La Cruz, 3, 28049 Madrid, Spain
| | - Sofía Calero
- Department
of Physical, Chemical, and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera Km 1, ES-41013 Seville, Spain
- Materials
Simulation and Modelling, Department of Applied Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
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Sreekantan S, Yong AX, Basiron N, Ahmad F, De'nan F. Effect of Solvent on Superhydrophobicity Behavior of Tiles Coated with Epoxy/PDMS/SS. Polymers (Basel) 2022; 14:2406. [PMID: 35745983 DOI: 10.3390/polym14122406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 06/04/2022] [Accepted: 06/08/2022] [Indexed: 12/10/2022] Open
Abstract
Superhydrophobic coatings are widely applied in various applications due to their water-repelling characteristics. However, producing a durable superhydrophobic coating with less harmful low surface materials and solvents remains a challenge. Therefore, the aim of this work is to study the effects of three different solvents in preparing a durable and less toxic superhydrophobic coating containing polydimethylsiloxane (PDMS), silica solution (SS), and epoxy resin (DGEBA). A simple sol-gel method was used to prepare a superhydrophobic coating, and a spray-coating technique was employed to apply the superhydrophobic coating on tile substrates. The coated tile substrates were characterized for water contact angle (WCA) and tilting angle (TA) measurements, Field-Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscopy (AFM), and Fourier Transform Infrared Spectroscopy (FTIR). Among 3 types of solvent (acetone, hexane, and isopropanol), a tile sample coated with isopropanol-added solution acquires the highest water contact angle of 152 ± 2° with a tilting angle of 7 ± 2° and a surface roughness of 21.80 nm after UV curing for 24 h. The peel off test showed very good adherence of the isopropanol-added solution coating on tiles. A mechanism for reactions that occur in the best optimized solvent is proposed.
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8
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Huynh TB, Groth CP, Ramachandran G, Banerjee S, Stenzel M, Blair A, Sandler DP, Engel LS, Kwok RK, Stewart PA. Estimates of Inhalation Exposures among Land Workers during the Deepwater Horizon Oil Spill Clean-up Operations. Ann Work Expo Health 2021; 66:i124-i139. [PMID: 34368831 PMCID: PMC8989042 DOI: 10.1093/annweh/wxab028] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 03/09/2021] [Accepted: 03/31/2021] [Indexed: 01/05/2023] Open
Abstract
Following the Deepwater Horizon oil spill disaster, thousands of workers and volunteers cleaned the shoreline across four coastal states of the Gulf of Mexico. For the GuLF STUDY, we developed quantitative estimates of oil-related chemical exposures [total petroleum hydrocarbons (THC), benzene, toluene, ethylbenzene, xylene, and n-hexane (BTEX-H)] from personal measurements on workers performing various spill clean-up operations on land. These operations included decontamination of vessels, equipment, booms, and personnel; handling of oily booms; hazardous waste management; beach, marsh, and jetty clean-up; aerial missions; wildlife rescue and rehabilitation; and administrative support activities. Exposure estimates were developed for unique groups of workers by (i) activity, (ii) state, and (iii) time period. Estimates of the arithmetic means (AMs) for THC ranged from 0.04 to 3.67 ppm. BTEX-H estimates were substantially lower than THC (in the parts per billion range). Both THC and BTEX-H estimates were substantially lower than their respective occupational exposure limits. The work group, 'Fueled engines' consistently was one of the higher exposed groups to THC and BTEX-H. Notable differences in the AM exposures were observed by activity, time and, to a lesser degree, by state. These exposure estimates were used to develop job-exposure matrices for the GuLF STUDY.
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Affiliation(s)
- Tran B Huynh
- Department of Environmental and Occupational Health, Dornsife School of Public Health, Drexel University, 3215 Market St., Philadelphia, PA 19004, USA,Author to whom correspondence should be addressed. Tel: +1-612-669-8234; e-mail:
| | - Caroline P Groth
- Department of Epidemiology and Biostatistics, School of Public Health, West Virginia University, One Medical Center Drive, Morgantown, WV 26506, USA
| | - Gurumurthy Ramachandran
- Department of Environmental Health and Engineering, Bloomberg School of Public Health, Johns Hopkins University, 615 N Wolfe St, Baltimore, MD 21218, USA
| | - Sudipto Banerjee
- Department of Biostatistics, UCLA Fielding School of Public Health, University of California—Los Angeles, 650 Charles E. Young Dr. South, Los Angeles, CA 90095, USA
| | - Mark Stenzel
- Exposure Assessment Applications, LLC, 6045 N. 27th. St., Arlington, VA 22207, USA
| | - Aaron Blair
- Division of Cancer Epidemiology and Genetics, Occupational and Environmental Epidemiology Branch, National Cancer Institute, 9609 Medical Center Drive, Gaithersburg, MD 20892, USA
| | - Dale P Sandler
- Chronic Disease Epidemiology Group, National Institute of Environmental Health Sciences, 111 T.W. Alexander Drive – MD A3-05, Research Triangle Park, NC 27709, USA
| | - Lawrence S Engel
- Chronic Disease Epidemiology Group, National Institute of Environmental Health Sciences, 111 T.W. Alexander Drive – MD A3-05, Research Triangle Park, NC 27709, USA,Department of Epidemiology, University of North Carolina at Chapel Hill, 135 Dauer Drive, Chapel Hill, NC 27599, USA
| | - Richard K Kwok
- Chronic Disease Epidemiology Group, National Institute of Environmental Health Sciences, 111 T.W. Alexander Drive – MD A3-05, Research Triangle Park, NC 27709, USA,Office of the Director, National Institute of Environmental Health Sciences, 9000 Rockville Pike, Bethesda, MD 20892, USA
| | - Patricia A Stewart
- Stewart Exposure Assessments, LLC, 6045 N. 27th. St., Arlington, VA 22207, USA
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Sett S, Oh J, Cha H, Veriotti T, Bruno A, Yan X, Barac G, Bolton LW, Miljkovic N. Lubricant-Infused Surfaces for Low-Surface-Tension Fluids: The Extent of Lubricant Miscibility. ACS Appl Mater Interfaces 2021; 13:23121-23133. [PMID: 33949848 DOI: 10.1021/acsami.1c02716] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Lubricant-infused surfaces (LISs) and slippery liquid-infused porous surfaces (SLIPSs) have shown remarkable success in repelling low-surface-tension fluids. The atomically smooth, defect-free slippery surface leads to reduced droplet pinning and omniphobicity. However, the presence of a lubricant introduces liquid-liquid interactions with the working fluid. The commonly utilized lubricants for LISs and SLIPSs, although immiscible with water, show various degrees of miscibility with organic polar and nonpolar working fluids. Here, we rigorously investigate the extent of miscibility by considering a wide range of liquid-vapor surface tensions (12-73 mN/m) and different categories of lubricants having a range of viscosities (5-2700 cSt). Using high-fidelity analytical chemistry techniques including X-ray photoelectron spectroscopy, nuclear magnetic resonance, thermogravimetric analysis, and two-dimensional gas chromatography, we quantify lubricant miscibility to parts per billion accuracy. Furthermore, we quantify lubricant concentrations in the collected condensate obtained from prolonged condensation experiments with ethanol and hexane to delineate mixing and shear-based lubricant drainage mechanisms and to predict the lifetime of LISs and SLIPSs. Our work not only elucidates the effect of lubricant properties on miscibility with various fluids but also develops guidelines for developing stable and robust LISs and SLIPSs.
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Affiliation(s)
- Soumyadip Sett
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Junho Oh
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Hyeongyun Cha
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - Tincuta Veriotti
- BP Corporation North America, Inc., 150 West Warrenville Road, Naperville, Illinois 60563, United States
| | - Alessandra Bruno
- BP Corporation North America, Inc., 150 West Warrenville Road, Naperville, Illinois 60563, United States
| | - Xiao Yan
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
| | - George Barac
- BP Corporation North America, Inc., 150 West Warrenville Road, Naperville, Illinois 60563, United States
| | - Leslie W Bolton
- BP plc, Chertsey Road, Sunbury-on-Thames, Middlesex TW16 7LN, U.K
| | - Nenad Miljkovic
- Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Department of Electrical and Computer Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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10
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Hernández-Monje D, Giraldo L, Moreno-Piraján JC. Enthalpic and Liquid-Phase Adsorption Study of Toluene-Cyclo hexane and Toluene-Hexane Binary Systems on Modified Activated Carbons. Molecules 2021; 26:molecules26102839. [PMID: 34064753 PMCID: PMC8151323 DOI: 10.3390/molecules26102839] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/01/2021] [Accepted: 05/04/2021] [Indexed: 12/03/2022] Open
Abstract
The liquid-phase adsorption of toluene in cyclohexane and hexane solutions on modified activated carbons was evaluated; the energy involved in the interaction between these solutions and the solids was determined by immersion enthalpies of pure solvents and their mixtures, and the contribution of the system constituents was calculated by differential enthalpies. The thermal treatment generated modifications that favored adsorption and interaction with the evaluated solutions, since it increased the textural parameters and the basic character of the samples. Cyclohexane could create greater competition with the adsorption sites compared to hexane, but it favored the increase in adsorption capacities (0.416 to 1.026 mmol g−1) and the interactions with the solid evaluated through the immersion enthalpies. The immersion enthalpies of pure solvents (−16.36 to −112.7 J g−1) and mixtures (−25.65 to −104.34 J g−1) had exothermic behaviors that were decreasing due to the possible displacement of solvent molecules when increasing the solute concentration in the mixtures. The differential enthalpies for toluene were negative (−18.63 to −2.14 J), mainly due to the π–π interaction with the solid, while those of the solvent–solid component tended to be positive values (−4.25 to 55.97 J) due to the displacement of the solvent molecules by those of toluene.
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Affiliation(s)
- Diana Hernández-Monje
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Sede Bogotá, Carrera 30 No 45-03, Bogotá 11001, Colombia; (D.H.-M.); (L.G.)
| | - Liliana Giraldo
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Sede Bogotá, Carrera 30 No 45-03, Bogotá 11001, Colombia; (D.H.-M.); (L.G.)
| | - Juan Carlos Moreno-Piraján
- Departamento de Química, Facultad de Ciencias, Universidad de los Andes, Carrera 1 este No 18A-10, Bogotá 111711, Colombia
- Correspondence: ; Tel.: +571-339-4949 (ext. 3465-3478-4753)
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Rapinel V, Claux O, Abert-Vian M, McAlinden C, Bartier M, Patouillard N, Jacques L, Chemat F. 2-Methyloxolane (2-MeOx) as Sustainable Lipophilic Solvent to Substitute Hexane for Green Extraction of Natural Products. Properties, Applications, and Perspectives. Molecules 2020; 25:E3417. [PMID: 32731508 DOI: 10.3390/molecules25153417] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/19/2020] [Accepted: 07/24/2020] [Indexed: 12/01/2022] Open
Abstract
This review presents a complete picture of current knowledge on 2-methyloxolane (2-MeOx), a bio-based solvent for the extraction of natural products and food ingredients. It provides the necessary background about the properties of 2-MeOx, not only its solvent power and extraction efficiency, but its detailed toxicological profile and environmental impacts are discussed. We compared 2-MeOx with hexane which is the most used petroleum-based solvent for extraction of lipophilic natural products. The final part focuses on successful industrial transfer, including technologic, economic, and safety impacts. The replacement of petroleum-based solvents is a hot research topic, which affects several fields of modern plant-based chemistry. All the reported applications have shown that 2-MeOx is an environmentally and economically viable alternative to conventional petroleum-based solvents for extraction of lipophilic foodstuff and natural products.
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Rapinel V, Chemat A, Santerre C, Belay J, Hanaei F, Vallet N, Jacques L, Fabiano-Tixier AS. 2-Methyloxolane as a Bio-Based Solvent for Green Extraction of Aromas from Hops ( Humulus lupulus L.). Molecules 2020; 25:molecules25071727. [PMID: 32283752 PMCID: PMC7180635 DOI: 10.3390/molecules25071727] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 04/04/2020] [Accepted: 04/06/2020] [Indexed: 12/15/2022] Open
Abstract
The potential of using the bio-based solvent 2-methyloxolane, also known as 2-methyltetrahydrofuran or 2-MeTHF, as an alternative to petroleum solvents such as hexane, was investigated for the extraction of volatile compounds from hop cones (Humulus lupulus L.). Lab scale extractions were coupled with in silico prediction of solutes solubility to assess the technical potential of this bio-based solvent. The predictive approach was performed using the simulation software COSMO-RS (conductor like screening model for real solvants) and showed that the 2-methyloxolane is as good as or better than hexane to solubilize the majority of aromas from hop cones. The experimental results indicated that the highest aroma yield was obtained with 2-methyloxolane with 20.2% while n-hexane was only able to extract 17.9%. The characterization of aromas extracted by the two solvents showed a similar composition, where lupulone was the main component followed by humulone. No selectivity of the solvents was observed for any of the major analytes. Finally, a sensory analysis was performed on the extracts, showing that both concretes using 2-methyloxolane and hexane have similar olfactory profiles. The results indicate that 2-methyloxolane could be a promising bio-based extraction solvent for hexane substitution.
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Affiliation(s)
- Vincent Rapinel
- Green Extraction Team, Avignon University, INRAE, UMR408, F-84000 Avignon, France; (V.R.); (A.C.)
- Pennakem Europa, 224 avenue de la Dordogne, F-59944 Dunkerque, France;
| | - Aziadé Chemat
- Green Extraction Team, Avignon University, INRAE, UMR408, F-84000 Avignon, France; (V.R.); (A.C.)
| | - Cyrille Santerre
- Institut Supérieur International du Parfum, de la Cosmétique et de l’Aromatique alimentaire (ISIPCA), 34-36 rue du parc de Clagny, F-78000 Versailles, France; (C.S.); (J.B.); (F.H.); (N.V.)
| | - Justine Belay
- Institut Supérieur International du Parfum, de la Cosmétique et de l’Aromatique alimentaire (ISIPCA), 34-36 rue du parc de Clagny, F-78000 Versailles, France; (C.S.); (J.B.); (F.H.); (N.V.)
| | - Farnaz Hanaei
- Institut Supérieur International du Parfum, de la Cosmétique et de l’Aromatique alimentaire (ISIPCA), 34-36 rue du parc de Clagny, F-78000 Versailles, France; (C.S.); (J.B.); (F.H.); (N.V.)
| | - Nadine Vallet
- Institut Supérieur International du Parfum, de la Cosmétique et de l’Aromatique alimentaire (ISIPCA), 34-36 rue du parc de Clagny, F-78000 Versailles, France; (C.S.); (J.B.); (F.H.); (N.V.)
| | - Laurence Jacques
- Pennakem Europa, 224 avenue de la Dordogne, F-59944 Dunkerque, France;
| | - Anne-Sylvie Fabiano-Tixier
- Green Extraction Team, Avignon University, INRAE, UMR408, F-84000 Avignon, France; (V.R.); (A.C.)
- Correspondence:
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Zaunschirm M, Pignitter M, Kopic A, Keßler C, Hochkogler C, Kretschy N, Somoza MM, Somoza V. Exposure of Human Gastric Cells to Oxidized Lipids Stimulates Pathways of Amino Acid Biosynthesis on a Genomic and Metabolomic Level. Molecules 2019; 24:molecules24224111. [PMID: 31739445 PMCID: PMC6891525 DOI: 10.3390/molecules24224111] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 11/04/2019] [Accepted: 11/12/2019] [Indexed: 01/05/2023] Open
Abstract
The Western diet is characterized by a high consumption of heat-treated fats and oils. During deep-frying processes, vegetable oils are subjected to high temperatures which result in the formation of lipid peroxidation products. Dietary intake of oxidized vegetable oils has been associated with various biological effects, whereas knowledge about the effects of structurally-characterized lipid peroxidation products and their possible absorption into the body is scarce. This study investigates the impact of linoleic acid, one of the most abundant polyunsaturated fatty acids in vegetable oils, and its primary and secondary peroxidation products, 13-HpODE and hexanal, on genomic and metabolomic pathways in human gastric cells (HGT-1) in culture. The genomic and metabolomic approach was preceded by an up-to-six-hour exposure study applying 100 µM of each test compound to the apical compartment in order to quantitate the compounds’ recovery at the basolateral side. Exposure of HGT-1 cells to either 100 µM linoleic acid or 100 µM 13-HpODE resulted in the formation of approximately 1 µM of the corresponding hydroxy fatty acid, 13-HODE, in the basolateral compartment, whereas a mean concentration of 0.20 ± 0.13 µM hexanal was quantitated after an equivalent application of 100 µM hexanal. An integrated genomic and metabolomic pathway analysis revealed an impact of the linoleic acid peroxidation products, 13-HpODE and hexanal, primarily on pathways related to amino acid biosynthesis (p < 0.05), indicating that peroxidation of linoleic acid plays an important role in the regulation of intracellular amino acid biosynthesis.
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Affiliation(s)
- Mathias Zaunschirm
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Marc Pignitter
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
- Correspondence: ; Tel.: +43-14277-70621
| | - Antonio Kopic
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Claudia Keßler
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Christina Hochkogler
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Nicole Kretschy
- Department of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Mark Manuel Somoza
- Department of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Veronika Somoza
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
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Sett S, Sokalski P, Boyina K, Li L, Rabbi KF, Auby H, Foulkes T, Mahvi A, Barac G, Bolton LW, Miljkovic N. Stable Dropwise Condensation of Ethanol and Hexane on Rationally Designed Ultrascalable Nanostructured Lubricant-Infused Surfaces. Nano Lett 2019; 19:5287-5296. [PMID: 31328924 DOI: 10.1021/acs.nanolett.9b01754] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Vapor condensation is a widely used industrial process for transferring heat and separating fluids. Despite progress in developing low surface energy hydrophobic and micro/nanostructured superhydrophobic coatings to enhance water vapor condensation, demonstration of stable dropwise condensation of low-surface-tension fluids has not been achieved. Here, we develop rationally designed nanoengineered lubricant-infused surfaces (LISs) having ultralow contact angle hysteresis (<3°) for stable dropwise condensation of ethanol (γ ≈ 23 mN/m) and hexane (γ ≈ 19 mN/m). Using a combination of optical imaging and rigorous heat transfer measurements in a controlled environmental chamber free from noncondensable gases (<4 Pa), we characterize the condensation behavior of ethanol and hexane on ultrascalable nanostructured CuO surfaces impregnated with fluorinated lubricants having varying viscosities (0.496 < μ < 5.216 Pa·s) and chemical structures (branched versus linear, Krytox and Fomblin). We demonstrate stable dropwise condensation of ethanol and hexane on LISs impregnated with Krytox 1525, attaining about 200% enhancement in condensation heat transfer coefficient for both fluids compared to filmwise condensation on hydrophobic surfaces. In contrast to previous studies, we use 7 h of steady dropwise condensation experiments to demonstrate the importance of rational lubricant selection to minimize lubricant drainage and maximize LIS durability. This work not only demonstrates an avenue to achieving stable dropwise condensation of ethanol and hexane, it develops the fundamental design principles for creating durable LISs for enhanced condensation heat transfer of low-surface-tension fluids.
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Affiliation(s)
| | | | | | | | | | | | | | | | - George Barac
- BP International Limited , 150 W. Warrenville Road , Naperville , Illinois 60563 , United States
| | - Leslie W Bolton
- BP plc , Chertsey Road , Sunbury-on-Thames, Middlesex TW16 7LN , United Kingdom
| | - Nenad Miljkovic
- Materials Research Laboratory , University of Illinois , Urbana , Illinois 61801 , United States
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER) , Kyushu University , 744 Moto-oka , Nishi-ku , Fukuoka 819-0395 , Japan
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Hernández-Monje D, Giraldo L, Moreno-Piraján JC. Study of Hexane Adsorption on Activated Carbons with Differences in Their Surface Chemistry. Molecules 2018; 23:E476. [PMID: 29470439 DOI: 10.3390/molecules23020476] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 02/09/2018] [Accepted: 02/12/2018] [Indexed: 11/17/2022] Open
Abstract
The study of aliphatic compounds adsorption on activated carbon can be carried out from the energetic change involved in the interaction; the energy values can be determined from isotherms or by the immersion enthalpy. Vapor phase adsorption isotherms of hexane at 263 K on five activated carbons with different content of oxygenated groups and the immersion enthalpy of the activated carbons in hexane and water were determined in order to characterize the interactions in the solid-liquid system, and for calculating the hydrophobic factor of the activated carbons. The micropore volume and characteristic energy from adsorption isotherms of hexane, the BET (Brunauer-Emmett-Teller) surface area from the adsorption isotherms of N₂, and the area accessible to the hexane from the immersion enthalpy were calculated. The activated carbon with the lowest content of oxygenated groups (0.30 µmolg-¹) and the highest surface area (996 m²g-¹) had the highest hexane adsorption value: 0.27 mmol g-¹; the values for Eo were between 5650 and 6920 Jmol-¹ and for ΔHim were between -66.1 and -16.4 Jg-¹. These determinations allow us to correlate energetic parameters with the surface area and the chemical modifications that were made to the solids, where the surface hydrophobic character of the activated carbon favors the interaction.
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Jeong EJ, Lee SH, Kim BT, Lee G, Yun SS, Lim HS, Kim YS. An analysis method for determining residual hexane in health functional food products using static headspace gas chromatography. Food Sci Biotechnol 2017; 26:363-368. [PMID: 30263551 DOI: 10.1007/s10068-017-0049-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 01/06/2017] [Accepted: 01/18/2017] [Indexed: 11/24/2022] Open
Abstract
A method for analyzing the contents of residual hexane in health functional food products was developed. The dissolving solvents in the health functional food products and the internal standard selected were N,N-dimethylacetamide and heptane, respectively. The analysis conditions for headspace-gas chromatography/flame ionization detection (HS-GC/FID) and headspace-gas chromatography/mass spectrometry (HS-GC/MS) were determined as 18 mL of headspace volume, 100°C of headspace oven temperature, and 30 min of equilibration time; a Durabond (DB)-624 column was selected for this analysis. To validate this method, which applies N,N-dimethylacetamide as a dissolving solvent, the limit of detection and limit of quantification (LOQ) values based on the HS-GC/FID and HS-GC/MS analyses results were found to be 0.10, 0.29 and 0.16, 0.47 mg/L, respectively. The recoveries and coefficient of variation (CV) obtained by HS-GC/MS were 96.39-119.86% and 0.04-1.25%, respectively, better than those obtained by HS-GC/FID. By applying the HS-GC/MS method, it was possible to analyze the content of the residual hexane in 60 different types of health functional food products.
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Affiliation(s)
- Eun-Jeong Jeong
- 1Department of Food Science and Technology, Chonbuk National University, Jeonju, Jeonbuk, 54896 Korea
| | - Sang Hwa Lee
- 2Department of Bioactive Material Sciences, Chonbuk National University, Jeonju, Jeonbuk, 54896 Korea
| | - Beom-Tea Kim
- 3Keunsaram Educational Development Institute, Center of Bioactive Materials, Chonbuk National University, Jeonju, Jeonbuk, 54896 Korea
| | - Gunyoung Lee
- 4Food Additives and Packaging Division, National Institute of Food and Drug Safety Evaluation, Osong, Chungbuk, 28159 Korea
| | - Sang Soon Yun
- 4Food Additives and Packaging Division, National Institute of Food and Drug Safety Evaluation, Osong, Chungbuk, 28159 Korea
| | - Ho Soo Lim
- 4Food Additives and Packaging Division, National Institute of Food and Drug Safety Evaluation, Osong, Chungbuk, 28159 Korea
| | - Yong-Suk Kim
- 1Department of Food Science and Technology, Chonbuk National University, Jeonju, Jeonbuk, 54896 Korea
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Emelyanenko KA, Emelyanenko AM, Boinovich LB. Image Charge Effects in the Wetting Behavior of Alkanes on Water with Accounting for Water Solubility. Materials (Basel) 2016; 9:E177. [PMID: 28773305 DOI: 10.3390/ma9030177] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 02/28/2016] [Accepted: 02/29/2016] [Indexed: 11/16/2022]
Abstract
Different types of surface forces, acting in the films of pentane, hexane, and heptane on water are discussed. It is shown that an important contribution to the surface forces originates from the solubility of water in alkanes. The equations for the distribution of electric potential inside the film are derived within the Debye-Hückel approximation, taking into account the polarization of the film boundaries by discrete charges at water-alkane interface and by the dipoles of water molecules dissolved in the film. On the basis of above equations we estimate the image charge contribution to the surface forces, excess free energy, isotherms of water adsorption in alkane film, and the total isotherms of disjoining pressure in alkane film. The results indicate the essential influence of water/alkane interface charging on the disjoining pressure in alkane films, and the wettability of water surface by different alkanes is discussed.
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Guzeldag G, Kadioglu L, Mercimek A, Matyar F. Preliminary examination of herbal extracts on the inhibition of Helicobacter pylori. Afr J Tradit Complement Altern Med 2013; 11:93-96. [PMID: 24653559 PMCID: PMC3957247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
BACKGROUND This work aims at describing the traditional uses, to determine the antimicrobial potential of two different extracts hexane, acetone of the leaves of Citrus unshiu, Citrus sinensis, Citrus limon, Laurus nobilis, Citrus paradisi on clinical strain of H. pylori in a bid to identify potential sources of cheap starting materials for the synthesis of new drugs. H. pylori strain was a culture collection of Hacettepe University, Turkey. METHODS The activity was quantitatively assessed on the basis of the inhibition zone, and their activity index was also calculated along with the MIC method. RESULTS All the plants demonstrated antimicrobial activity against H. pylori with zone of inhibition diameters ranging from 0 - 30 mm and minimum inhibitory concentration (MIC) values ranging from 1:512-1:4096 dilutions. CONCLUSION The results may serve as scientific validation of the ethnomedicinal uses of the Citrus unshiu, Citrus sinensis, Citrus limon, Laurus nobilis, and Citrus paradisi in the treatment of H. pylori-related infections. However, further investigations would be necessary to determine their toxicological properties, in-vivo potencies and mechanism of action against H. pylori.
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Affiliation(s)
- Gulcihan Guzeldag
- Faculty of Arts and Sciences, Department of Molecular Biology and Genetics, Kilis 7 Aralik University, 79000, Kilis, Turkey
| | - Lutfiye Kadioglu
- Faculty of Arts and Sciences, Department of Molecular Biology and Genetics, Kilis 7 Aralik University, 79000, Kilis, Turkey
| | - Aysun Mercimek
- Faculty of Arts and Sciences, Department of Molecular Biology and Genetics, Kilis 7 Aralik University, 79000, Kilis, Turkey
| | - Fatih Matyar
- Faculty of Education, Department of Science and Technology Education, Cukurova University, 01330 Saricam, Adana, Turkey
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Constant Anatole P, Guru SK, Bathelemy N, Jeanne N, Bhushan S, Murayama T, Saxena AK. Ethyl acetate fraction of Garcina epunctata induces apoptosis in human promyelocytic cells (HL-60) through the ROS generation and G0/G1 cell cycle arrest: a bioassay-guided approach. Environ Toxicol Pharmacol 2013; 36:865-874. [PMID: 23981377 DOI: 10.1016/j.etap.2013.07.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 07/18/2013] [Accepted: 07/26/2013] [Indexed: 06/02/2023]
Abstract
Number of deaths due to cancer diseases is increasing in the world. There is an urgent need to develop alternative therapeutic measures against the disease. Our study reports the cytotoxicity activity of Garcina epunctata (gutifferae) in human promyelocytic leukemia cells (HL-60) and prostate cancer cells (PC-3) was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT). Changes in mitochondrial membrane potential (MMP), reactive oxygen species (ROS) and morphological changes associated with apoptosis were examined by flow cytometry and Hoescht staining respectively. The results of in vitro antiproliferative screening of fractions and extract from G. epunctata indicated that three fractions inhibited the viability of PC-3 cells with IC₅₀ varied from 50 to 88 μ/ml while two fractions inhibited the proliferation of HL-60 cells with IC₅₀ range between 47.5 and 12 μg/ml. Among the entire fraction tested, Hex-EtOAc (75:25) showed cytotoxic effects on the two cell lines and EtOAc fraction was most active only HL-60 cells (12 μg/ml). Treatment of HL-60 cells with G. epunctata (20, 50, 100 μg/ml) for 24 h led to a significant dose-dependent increase in the percentage of cells in sub-G1 phase by analysis of the content of DNA in cells, and a number of apoptotic bodies containing nuclear fragments were observed in cells treated with 100 μg/ml. The EtOAc fraction of G. epunctata treatment significantly arrested HL-60 cells at the G0/G1 phase (p<0.05) and ROS was significantly elevated as well as the loss of membrane mitochondrial potential in a concentration dependant manner. The results demonstrated that the EtOAc fraction of G. epunctata inhibited the proliferation of HL-60 cells, leading to cell cycle arrest and programmed cell death, which was confirmed to occur through the mitochondrial pathway.
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Affiliation(s)
- Pieme Constant Anatole
- Department of Physiological Sciences and Biochemistry, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, PO Box 1364 Yaoundé, Cameroon; Cancer Pharmacology Division, Indian Institute of Integrative Medicine, 180001, Canal Road, Jammu, India.
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Bezerra GP, Góis RWDS, de Brito TS, de Lima FJB, Bandeira MAM, Romero NR, Magalhães PJC, Santiago GMP. Phytochemical study guided by the myorelaxant activity of the crude extract, fractions and constituent from stem bark of Hymenaea courbaril L. J Ethnopharmacol 2013; 149:62-69. [PMID: 23764737 DOI: 10.1016/j.jep.2013.05.052] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2013] [Revised: 05/24/2013] [Accepted: 05/31/2013] [Indexed: 06/02/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Hymenaea courbaril L. (Caesalpinoideae) is used in Brazilian folk medicine to treat anemia, kidney problems, sore throat and other dysfunctions of the respiratory system, such as bronchitis and asthma, although such properties are yet to be scientifically validated. AIM OF THE STUDY In order to give a scientific basis to support the traditional use of Hymenaea courbaril, this study was designed to evaluate antioxidant, myorelaxant and anti-inflammatory properties of the ethanol extract from stem bark and its fractions. The myorelaxant effect of astilbin, a flavonoid isolated from the bioactive ethyl acetate fraction (EAF), has also been evaluated. MATERIAL AND METHODS In the present study ethanol extract from stem bark (EEHC) and fractions were analyzed using bioassay-guided fractionation. The following activities were investigated: antioxidant by 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, myorelaxant on rat tracheal smooth muscle, and anti-inflammatory using ovalbumin-induced leukocytosis and airway hyperresponsiveness in rats. RESULTS The results of the present investigation show that the whole extract of Hymenaea courbaril and some of its fractions strongly scavenged DPPH radical. The extract showed myorelaxant activity on rat trachea, being EAF its highest efficient fraction. Bio-guided study allowed the isolation of astilbin, a well-known flavonoid. The activity induced by this compound indicates that it may be partly responsible for the myorelaxant effect of EAF. EAF reduced contractions that depended on divalent cation inflow through voltage-operated Ca(2+) channels (VOCCs) or receptor-operated Ca(2+) channels (ROCCs), but it was more potent to inhibit VOCC- than ROCC-dependent contraction induced by Ca(2+) addition in ACh-enriched Ca(2+)-free medium. Oral pretreatment of antigen-challenged animals with EAF prevented airway hyperresponsiveness on KCl-induced contraction and reduced the number of total white cells, particularly eosinophils and neutrophils in bronchoalveolar lavage. CONCLUSIONS This study provided scientific basis that Hymenaea courbaril presents potential antioxidant, myorelaxant and anti-inflammatory actions, which support its use in folk medicine to treat inflammatory airway diseases.
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Affiliation(s)
- Gabrieli Penha Bezerra
- Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Odontologia e Enfermagem, Universidade Federal do Ceará, Brazil.
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Liu J, Chen L, Wang J, Qiao J, Zhang W. Proteomic analysis reveals resistance mechanism against biofuel hexane in Synechocystis sp. PCC 6803. Biotechnol Biofuels 2012; 5:68. [PMID: 22958739 PMCID: PMC3479031 DOI: 10.1186/1754-6834-5-68] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2012] [Accepted: 08/30/2012] [Indexed: 05/19/2023]
Abstract
BACKGROUND Recent studies have demonstrated that photosynthetic cyanobacteria could be an excellent cell factory to produce renewable biofuels and chemicals due to their capability to utilize solar energy and CO2 as the sole energy and carbon sources. Biosynthesis of carbon-neutral biofuel alkanes with good chemical and physical properties has been proposed. However, to make the process economically feasible, one major hurdle to improve the low cell tolerance to alkanes needed to be overcome. RESULTS Towards the goal to develop robust and high-alkane-tolerant hosts, in this study, the responses of model cyanobacterial Synechocystis PCC 6803 to hexane, a representative of alkane, were investigated using a quantitative proteomics approach with iTRAQ - LC-MS/MS technologies. In total, 1,492 unique proteins were identified, representing about 42% of all predicted protein in the Synechocystis genome. Among all proteins identified, a total of 164 and 77 proteins were found up- and down-regulated, respectively. Functional annotation and KEGG pathway enrichment analyses showed that common stress responses were induced by hexane in Synechocystis. Notably, a large number of transporters and membrane-bound proteins, proteins against oxidative stress and proteins related to sulfur relay system and photosynthesis were induced, suggesting that they are possibly the major protection mechanisms against hexane toxicity. CONCLUSION The study provided the first comprehensive view of the complicated molecular mechanism employed by cyanobacterial model species, Synechocystis to defend against hexane stress. The study also provided a list of potential targets to engineer Synechocystis against hexane stress.
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Affiliation(s)
- Jie Liu
- School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P.R. China
- Key Laboratory of Systems Bioengineering, Ministry of Education of China, Tianjin 300072, P.R. China
| | - Lei Chen
- School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P.R. China
- Key Laboratory of Systems Bioengineering, Ministry of Education of China, Tianjin 300072, P.R. China
| | - Jiangxin Wang
- School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P.R. China
- Key Laboratory of Systems Bioengineering, Ministry of Education of China, Tianjin 300072, P.R. China
| | - Jianjun Qiao
- School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P.R. China
- Key Laboratory of Systems Bioengineering, Ministry of Education of China, Tianjin 300072, P.R. China
| | - Weiwen Zhang
- School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P.R. China
- Key Laboratory of Systems Bioengineering, Ministry of Education of China, Tianjin 300072, P.R. China
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Abstract
Objective: Broussonetia papyrifera is used as a traditional medicine to treat few diseases. However, the antiinflammatory effect of B. papyrifera stem bark has not been evaluated. The aim of this study is to investigate the effects of n-hexane fraction from methanol extract of B. papyrifera stem bark on lipopolysaccharide (LPS)-stimulated inflammation using RAW 264.7 cells. Materials and Methods: Methanol extract was obtained from B. papyrifera stem bark and its sequential fractions (hexane, dichloromathane, ethyl acetate, butanol, and aqueous) were obtained by extraction in solvents with increasing polarity and were examined in RAW 264.7 cells. Results: The secretion profiles of pro-inflammatory parameters, including nitric oxide (NO), tumor necrosis factor-α (TNF-α), and interleukin-1β (IL-1β) were found to be significantly reduced in 10-80 μg/ml dose ranges of n-hexane fraction (BP-H) from methanol extract of B. papyrifera stem bark. The expressions of inducible NO synthase (iNOS) was also significantly inhibited by BP-H. Reverse transcription-polymerase chain reaction (RT-PCR) analysis showed that BP-H treatment decreased LPS-induced iNOS mRNA expression in RAW 264.7 cells. Conclusion: The results suggest that the B. papyrifera stem bark has anti-inflammatory activity which inhibits the NO production and proinflammatory cytokines in RAW 264.7 cells. B. papyrifera stem bark might act as a potential therapeutic agent for inflammatory diseases.
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Affiliation(s)
- Wen-Tung Wu
- Department of Biotechnology, Yung-Ta Institute of Technology and Commerce, Pingtung, Taiwan.
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Bauer BA, Zhong Y, Meninger DJ, Davis JE, Patel S. Phase-transfer energetics of small-molecule alcohols across the water- hexane interface: molecular dynamics simulations using charge equilibration models. J Mol Graph Model 2011; 29:876-87. [PMID: 21414823 PMCID: PMC3070209 DOI: 10.1016/j.jmgm.2010.09.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2010] [Revised: 09/17/2010] [Accepted: 09/23/2010] [Indexed: 11/15/2022]
Abstract
We study the water-hexane interface using molecular dynamics (MD) and polarizable charge equilibration (CHEQ) force fields. Bulk densities for TIP4P-FQ water and hexane, 1.0086±0.0002 and 0.6378±0.0001 g/cm(3), demonstrate excellent agreement with experiment. Interfacial width and interfacial tension are consistent with previously reported values. The in-plane component of the dielectric permittivity (ɛ(||)) for water is shown to decrease from 81.7±0.04 to unity, transitioning longitudinally from bulk water to bulk hexane. ɛ(||) for hexane reaches a maximum in the interface, but this term represents only a small contribution to the total dielectric constant (as expected for a non-polar species). Structurally, net orientations of the molecules arise in the interfacial region such that hexane lies slightly parallel to the interface and water reorients to maximize hydrogen bonding. Interfacial potentials due to contributions of the water and hexane are calculated to be -567.9±0.13 and 198.7±0.01 mV, respectively, giving rise to a total potential in agreement with the range of values reported from previous simulations of similar systems. Potentials of mean force (PMF) calculated for methanol, ethanol, and 1-propanol for the transfer from water to hexane indicate an interfacial free energy minimum, corresponding to the amphiphilic nature of the molecules. The magnitudes of transfer free energies were further characterized from the solvation free energies of alcohols in water and hexane using thermodynamic integration. This analysis shows that solvation free energies for alcohols in hexane are 0.2-0.3 kcal/mol too unfavorable, whereas solvation of alcohols in water is approximately 1 kcal/mol too favorable. For the pure hexane-water interfacial simulations, we observe a monotonic decrease of the water dipole moment to near-vacuum values. This suggests that the electrostatic component of the desolvation free energy is not as severe for polarizable models than for fixed-charge force fields. The implications of such behavior pertain to the modeling of polar and charged solutes in lipidic environments.
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Affiliation(s)
- Brad A. Bauer
- Department of Chemistry and Biochemistry 238 Brown Laboratory University of Delaware Newark, DE 19716
| | - Yang Zhong
- Department of Chemistry and Biochemistry 238 Brown Laboratory University of Delaware Newark, DE 19716
| | - David J. Meninger
- Department of Chemistry and Biochemistry 238 Brown Laboratory University of Delaware Newark, DE 19716
- Department of Physics and Astronomy University of Delaware Newark, DE 19716
| | - Joseph E. Davis
- Department of Chemistry and Biochemistry 238 Brown Laboratory University of Delaware Newark, DE 19716
| | - Sandeep Patel
- Department of Chemistry and Biochemistry 238 Brown Laboratory University of Delaware Newark, DE 19716
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