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Li T, Liu X, Xiang H, Zhu H, Lu X, Feng B. Two-Phase Fermentation Systems for Microbial Production of Plant-Derived Terpenes. Molecules 2024; 29:1127. [PMID: 38474639 DOI: 10.3390/molecules29051127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 02/28/2024] [Accepted: 02/29/2024] [Indexed: 03/14/2024] Open
Abstract
Microbial cell factories, renowned for their economic and environmental benefits, have emerged as a key trend in academic and industrial areas, particularly in the fermentation of natural compounds. Among these, plant-derived terpenes stand out as a significant class of bioactive natural products. The large-scale production of such terpenes, exemplified by artemisinic acid-a crucial precursor to artemisinin-is now feasible through microbial cell factories. In the fermentation of terpenes, two-phase fermentation technology has been widely applied due to its unique advantages. It facilitates in situ product extraction or adsorption, effectively mitigating the detrimental impact of product accumulation on microbial cells, thereby significantly bolstering the efficiency of microbial production of plant-derived terpenes. This paper reviews the latest developments in two-phase fermentation system applications, focusing on microbial fermentation of plant-derived terpenes. It also discusses the mechanisms influencing microbial biosynthesis of terpenes. Moreover, we introduce some new two-phase fermentation techniques, currently unexplored in terpene fermentation, with the aim of providing more thoughts and explorations on the future applications of two-phase fermentation technology. Lastly, we discuss several challenges in the industrial application of two-phase fermentation systems, especially in downstream processing.
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Affiliation(s)
- Tuo Li
- College of Life and Health, Dalian University, Dalian 116622, China
| | - Ximeng Liu
- College of Life and Health, Dalian University, Dalian 116622, China
| | - Haoyu Xiang
- College of Life and Health, Dalian University, Dalian 116622, China
| | - Hehua Zhu
- College of Life and Health, Dalian University, Dalian 116622, China
| | - Xuan Lu
- College of Life and Health, Dalian University, Dalian 116622, China
| | - Baomin Feng
- College of Life and Health, Dalian University, Dalian 116622, China
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2
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Aceves-Luna H, Glossman-Mitnik D, Flores-Holguín N. Permeability of antioxidants through a lipid bilayer model with coarse-grained simulations. J Biomol Struct Dyn 2023:1-19. [PMID: 37768552 DOI: 10.1080/07391102.2023.2262044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 09/13/2023] [Indexed: 09/29/2023]
Abstract
Oxidative stress caused by pollution and lifestyle changes causes an excess of free radicals that react chemically with cell constituents leading to irreversible damage. There are molecules known as antioxidants that reduce the levels of free radicals. Some pigments of fruits and vegetables known as anthocyanins have antioxidant properties. Their interaction with the cell membrane becomes a crucial step in studying these substances. In this research, molecular dynamics simulations, particularly, coarse-grained molecular dynamics (CGMD) were used. This technique aims to replace functional groups with corresponding beads that represent their level of polarity and affinities to other chemical groups. Also, umbrella sampling was carried out to obtain free energy profiles that describe well the orientation and location of antioxidants in a membrane considering Trolox, Cyanidin, Gallic Acid, and Resveratrol molecules to study the structural effects they cause on it. It was concluded in this study that an antioxidant when crossing the membrane does not cause either damage to the structural properties or the loss of packing and stratification of phospholipids. it was also observed that the most reactive part of the molecules could easily approach area A prone to lipid oxidation, which can describe the antioxidant capacity of these molecules.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Hugo Aceves-Luna
- Laboratorio Virtual NANOCOSMOS, Departamento de Medio Ambiente y Energía, Centro de Investigación en Materiales Avanzados, Chihuahua, Chih, Mexico
| | - Daniel Glossman-Mitnik
- Laboratorio Virtual NANOCOSMOS, Departamento de Medio Ambiente y Energía, Centro de Investigación en Materiales Avanzados, Chihuahua, Chih, Mexico
| | - Norma Flores-Holguín
- Laboratorio Virtual NANOCOSMOS, Departamento de Medio Ambiente y Energía, Centro de Investigación en Materiales Avanzados, Chihuahua, Chih, Mexico
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Design of organyl phosphate-based pro-drugs: comparative analysis of the antibiotic action of alkyl protecting groups with different degree of fluorination. ACTA BIOMEDICA SCIENTIFICA 2022. [DOI: 10.29413/abs.2022-7.5-2.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Background. Molecular structures combining a phosphorus-containing counterpart and non-polar radicals are employed in design of pro-drugs as structural and functional groups necessary for transportation of drugs through cellular barriers. It is assumed that the carrier itself does not exhibit biological activity. However, the “organic phosphate – alkyl radical” complex may possess its own metabolic and pharmacological properties even in the absence of a drug moiety.The aim. To study the effect of fluorinated alkyl phosphates on the growth of bacterial test cultures in an agar medium and to identify conjugated metabolic markers using UV/visible spectroscopy.Materials and methods. The effect of six organyl phosphates on the growth of five types of bacteria under aerobic conditions was evaluated by the method of wells in an agar medium. For solutions containing cell metabolites of Pseudomonas aeruginosa, the absorption spectra were recorded at 250–280 nm. The principal component analysis (PCA) was used for multivariate comparative analysis of the spectra. Results. The studied organyl phosphates bearing the ethyl and propyl radicals are potential temporary carriers of the drug moiety, since they are capable of penetrating through cellular barriers. However, the fluorinated compounds exhibit bactericidal properties, the degree of which depends on the arrangement of fluorine atoms in the radical. The most active compounds are those exhaustively halogenated at the terminal carbon atom of the ethyl radical (-СН2-СF3), while non-fluorinated organyl phosphate is the least active. UV/visible spectra of P. aeruginosa cultivation products, according to PCA data, contain patterns reflecting the metabolic effects mediated by these structural features of the radicals.Conclusion. In terms of practical application of the studied compounds, the activity of a proantibiotic based on organyl phosphate with a non-fluorinated ethyl(propyl) radical will be determined only by the specificity of the drug moiety. Exactly the same molecule, but exhaustively fluorinated at the terminal carbon atom of the alkyl radical, is likely to be characterized by lower specificity and higher activity under the additive (or synergistic) action of metabolically active groups.
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Experimental Examination of Solubility and Lipophilicity as Pharmaceutically Relevant Points of Novel Bioactive Hybrid Compounds. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27196504. [PMID: 36235041 PMCID: PMC9573696 DOI: 10.3390/molecules27196504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 09/27/2022] [Accepted: 09/28/2022] [Indexed: 11/17/2022]
Abstract
The important physicochemical properties of three novel bioactive hybrid compounds with different groups (-CH3, -F and -Cl) were studied, including kinetic and thermodynamic solubility in pharmaceutically relevant solvents (buffer solutions and 1-octanol) as well as partition coefficient in system 1-octanol/buffer pH 7.4. The aqueous solubility of these chemicals is poor and ranged from 0.67 × 10-4 to 1.98 × 10-3 mol·L-1. The compounds studied are more soluble in the buffer pH 2.0, simulating the gastrointestinal tract environment (by an order of magnitude) than in the buffer pH 7.4 modelling plasma of blood. The solubility in 1-octanol is significantly higher; that is because of the specific interactions of the compounds with the solvent. The prediction solubility behaviour of the hybrid compounds using Hansen's three-parameter approach showed acceptable results. The experimental solubility of potential drugs was successfully correlated by means of two commonly known equations: modified Apelblat and van't Hoff. The temperature dependencies of partition coefficients of new hybrids in the model system 1-octanol/buffer pH 7.4 as a surrogate lipophilicity were measured by the shake flask method. It was found that compounds demonstrated a lipophilic nature and have optimal values of partition coefficients for oral absorption. Bioactive assay manifested that prepared compounds showed antifungal activities equal to or greater than fluconazole. In addition, the thermodynamic aspects of dissolution and partition processes have been examined. Bioactive assay manifested that prepared compounds showed antifungal activities equal to or greater than the reference drug.
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Beheshti E, Riahi S, Riazi M. Impacts of oil components on the stability of aqueous bulk CO2 foams: An experimental study. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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6
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Salthammer T, Morrison GC. Temperature and indoor environments. INDOOR AIR 2022; 32:e13022. [PMID: 35622714 DOI: 10.1111/ina.13022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 02/20/2022] [Accepted: 03/13/2022] [Indexed: 06/15/2023]
Abstract
From the thermodynamic perspective, the term temperature is clearly defined for ideal physical systems: A unique temperature can be assigned to each black body via its radiation spectrum, and the temperature of an ideal gas is given by the velocity distribution of the molecules. While the indoor environment is not an ideal system, fundamental physical and chemical processes, such as diffusion, partitioning equilibria, and chemical reactions, are predictably temperature-dependent. For example, the logarithm of reaction rate and equilibria constants are proportional to the reciprocal of the absolute temperature. It is therefore possible to have non-linear, very steep changes in chemical phenomena over a relatively small temperature range. On the contrary, transport processes are more influenced by spatial temperature, momentum, and pressure gradients as well as by the density, porosity, and composition of indoor materials. Consequently, emergent phenomena, such as emission rates or dynamic air concentrations, can be the result of complex temperature-dependent relationships that require a more empirical approach. Indoor environmental conditions are further influenced by the thermal comfort needs of occupants. Not only do occupants have to create thermal conditions that serve to maintain their core body temperature, which is usually accomplished by wearing appropriate clothing, but also the surroundings must be adapted so that they feel comfortable. This includes the interaction of the living space with the ambient environment, which can vary greatly by region and season. Design of houses, apartments, commercial buildings, and schools is generally utility and comfort driven, requiring an appropriate energy balance, sometimes considering ventilation but rarely including the impact of temperature on indoor contaminant levels. In our article, we start with a review of fundamental thermodynamic variables and discuss their influence on typical indoor processes. Then, we describe the heat balance of people in their thermal environment. An extensive literature study is devoted to the thermal conditions in buildings, the temperature-dependent release of indoor pollutants from materials and their distribution in the various interior compartments as well as aspects of indoor chemistry. Finally, we assess the need to consider temperature holistically with regard to the changes to be expected as a result of global emergencies such as climate change.
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Affiliation(s)
- Tunga Salthammer
- Department of Material Analysis and Indoor Chemistry, Fraunhofer WKI, Braunschweig, Germany
| | - Glenn C Morrison
- Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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Chung Y, Vermeire FH, Wu H, Walker PJ, Abraham MH, Green WH. Group Contribution and Machine Learning Approaches to Predict Abraham Solute Parameters, Solvation Free Energy, and Solvation Enthalpy. J Chem Inf Model 2022; 62:433-446. [PMID: 35044781 DOI: 10.1021/acs.jcim.1c01103] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
We present a group contribution method (SoluteGC) and a machine learning model (SoluteML) to predict the Abraham solute parameters, as well as a machine learning model (DirectML) to predict solvation free energy and enthalpy at 298 K. The proposed group contribution method uses atom-centered functional groups with corrections for ring and polycyclic strain while the machine learning models adopt a directed message passing neural network. The solute parameters predicted from SoluteGC and SoluteML are used to calculate solvation energy and enthalpy via linear free energy relationships. Extensive data sets containing 8366 solute parameters, 20,253 solvation free energies, and 6322 solvation enthalpies are compiled in this work to train the models. The three models are each evaluated on the same test sets using both random and substructure-based solute splits for solvation energy and enthalpy predictions. The results show that the DirectML model is superior to the SoluteML and SoluteGC models for both predictions and can provide accuracy comparable to that of advanced quantum chemistry methods. Yet, even though the DirectML model performs better in general, all three models are useful for various purposes. Uncertain predicted values can be identified by comparing the three models, and when the 3 models are combined together, they can provide even more accurate predictions than any one of them individually. Finally, we present our compiled solute parameter, solvation energy, and solvation enthalpy databases (SoluteDB, dGsolvDBx, dHsolvDB) and provide public access to our final prediction models through a simple web-based tool, software packages, and source code.
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Affiliation(s)
- Yunsie Chung
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Florence H Vermeire
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Haoyang Wu
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Pierre J Walker
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.,Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Michael H Abraham
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H OAJ, United Kingdom
| | - William H Green
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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Salthammer T, Grimme S, Stahn M, Hohm U, Palm WU. Quantum Chemical Calculation and Evaluation of Partition Coefficients for Classical and Emerging Environmentally Relevant Organic Compounds. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:379-391. [PMID: 34931808 DOI: 10.1021/acs.est.1c06935] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Octanol/water (KOW), octanol/air (KOA), and hexadecane/air (KHdA) partition coefficients are calculated for 67 organic compounds of environmental concern using computational chemistry. The extended CRENSO workflow applied here includes the calculation of extensive conformer ensembles with semiempirical methods and refinement through density functional theory, taking into account solvation models, especially COSMO-RS, and thermostatistical contributions. This approach is particularly advantageous for describing large and nonrigid molecules. With regard to KOW and KHdA, one can refer to many experimental data from direct and indirect measurement methods, and very good matches with results from our quantum chemical workflow are evident. In the case of the KOA values, however, good matches are only obtained for the experimentally determined values. Larger systematic deviations between data computed here and available, nonexperimental quantitative structure-activity relationship literature data occur in particular for phthalic acid esters and organophosphate esters. From a critical analysis of the coefficients calculated in this work and comparison with available literature data, we conclude that the presented quantum chemical composite approach is the most powerful so far for calculating reliable partition coefficients because all physical contributions to the conformational free energy are considered and the structure ensembles for the two phases are generated independently and consistently.
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Affiliation(s)
- Tunga Salthammer
- Department of Material Analysis and Indoor Chemistry, Fraunhofer WKI, 38108 Braunschweig, Germany
| | - Stefan Grimme
- Mulliken Center for Theoretical Chemistry, Institute for Physical and Theoretical Chemistry, University of Bonn, 53115 Bonn, Germany
| | - Marcel Stahn
- Mulliken Center for Theoretical Chemistry, Institute for Physical and Theoretical Chemistry, University of Bonn, 53115 Bonn, Germany
| | - Uwe Hohm
- Institute of Physical and Theoretical Chemistry, University of Braunschweig─Institute of Technology, 38106 Braunschweig, Germany
| | - Wolf-Ulrich Palm
- Institute of Sustainable and Environmental Chemistry, Leuphana University Lüneburg, 21335 Lüneburg, Germany
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Bhattacharya S, Das A, Krishnan K, Patil NA, Sadique J. Co-substrate-mediated utilization of high concentration of phenol by Aspergillus niger FP7 and reduction of its phytotoxicity on Vigna radiata L. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:64030-64038. [PMID: 33890222 DOI: 10.1007/s11356-021-13947-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Accepted: 04/12/2021] [Indexed: 06/12/2023]
Abstract
Phenol and its derivatives behave as mutagens, teratogens and carcinogens inducing adverse physiological effects and are considered environmental hazards. The present study focuses on high concentration phenol utilization by Aspergillus niger FP7 under various physicochemical parameters. The soil remediation potential of the culture for reducing phenol toxicity against Vigna radiata L. seed germination was also evaluated along with the extent of phenol utilization using high-performance liquid chromatography. Aspergillus niger FP7 showed phenol tolerance up to 1000 mg/l, beyond which there was a sharp reduction in phenol utilization. Supplementation of the mineral salt medium with glucose and peptone and application of a 100 rpm agitation rate enhanced phenol utilization (up to 88.3%). Phenol utilization efficiency decreased (up to 29.6%) when cadmium and mercury salts were present, but the same improved (59.4-75.5%) by the incorporation of cobalt, copper and zinc salts. Vigna radiata L. seeds sown in the non-augmented soil revealed a 3.27% germination index, and with fungal augmentation, the germination index improved (97.3%). The non-augmented soil demonstrated 3.1% phenol utilization, while for the augmented soil, the utilization was 79.3%. Based on the phytotoxicity study and chromatographic analysis, it could be inferred that Aspergillus niger FP7 significantly enhanced phenol utilization in soil. In the future, Aspergillus niger FP7 could be of potential use in bioremediation of sites polluted with high concentrations of phenol.
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Affiliation(s)
- Sourav Bhattacharya
- Department of Microbiology, School of Sciences, JAIN (Deemed-to-be University), 18/3, 9th Main, 3rd Block, Jayanagar, Bangalore, Karnataka, 560011, India.
| | - Arijit Das
- Department of Microbiology, School of Sciences, JAIN (Deemed-to-be University), 18/3, 9th Main, 3rd Block, Jayanagar, Bangalore, Karnataka, 560011, India
| | - Kavitha Krishnan
- Department of Microbiology, School of Sciences, JAIN (Deemed-to-be University), 18/3, 9th Main, 3rd Block, Jayanagar, Bangalore, Karnataka, 560011, India
| | - Nischita A Patil
- Department of Microbiology, School of Sciences, JAIN (Deemed-to-be University), 18/3, 9th Main, 3rd Block, Jayanagar, Bangalore, Karnataka, 560011, India
| | - Jaffar Sadique
- Department of Microbiology, School of Sciences, JAIN (Deemed-to-be University), 18/3, 9th Main, 3rd Block, Jayanagar, Bangalore, Karnataka, 560011, India
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Thiazolidine-2,4-dione derivative in 2-hydroxypropyl-β-cyclodextrin solutions: Complexation/solubilization, distribution and permeability. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115931] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Costa T, Ribeiro A, Machado R, Ribeiro C, Lanceros-Mendez S, Cavaco-Paulo A, Almeida A, das Neves J, Lúcio M, Viseu T. Polymeric Electrospun Fibrous Dressings for Topical Co-delivery of Acyclovir and Omega-3 Fatty Acids. Front Bioeng Biotechnol 2019; 7:390. [PMID: 31850337 PMCID: PMC6901623 DOI: 10.3389/fbioe.2019.00390] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Accepted: 11/19/2019] [Indexed: 12/31/2022] Open
Abstract
Herpetic infections caused by Herpes simplex virus (HSV) are among the most common human infections, affecting more than two quarters of the world's population. The standard treatment for orofacial herpes is the administration of antiviral drugs, mainly acyclovir (ACV). However, current products are mostly based on semisolid formulations that have limited ability to promote drug skin penetration and tend to leak from the application site, thus showing reduced ability to sustain local drug residence. This work reports on the production of poly (ε-caprolactone) (PCL) fibrous matrices with ACV and omega-3 fatty acids (ω3) for application as dressings to the topical treatment of orofacial herpes. PCL fibrous matrices with the co-incorporated bioactive compounds were obtained by electrospinning and characterized regarding their morphology, chemical, physical, and mechanical properties. The potential use of the developed polymeric fibrous matrices for topical applications was evaluated by: (i) the release kinetics of the bioactive compounds; (ii) the occlusive factor of the fibrous mat; (iii) ACV skin permeation capacity; and (iv) the cytotoxicity in a keratinocyte cell line. PCL fibrous matrices loaded with the bioactive compounds presented a smooth morphology and a good balance between flexibility and hardness essential to be durable for handling, while having a desirable texture to be used comfortably. The fibrous mat also provided a sustained release of ACV during 96 h and improved the skin permeability of this drug (Kp = 0.00928 ± 0.000867 cm/h) presenting also high porosity (74%) and a water vapor transmission rate (WVTR) of 881 ± 91 g/m2day, essential to maintain moist and oxygen for faster healing of herpes lesions. Furthermore, cytotoxicity studies suggest that the fibrous mat are safe for topical application. Overall, the PCL based electrospun fibrous matrices with ACV and ω3 hereby described have the potential to be used as therapeutic bandage systems for the treatment of orofacial herpes.
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Affiliation(s)
- Tiago Costa
- Centre of Physics of Universities of Minho and Porto (CF-UM-UP), University of Minho, Braga, Portugal
| | - Artur Ribeiro
- Centre of Biological Engineering (CEB), University of Minho, Braga, Portugal
| | - Raul Machado
- Centre of Molecular and Environmental Biology (CBMA), University of Minho, Braga, Portugal.,Institute of Science and Innovation for Sustainability (IB-S), University of Minho, Braga, Portugal
| | - Clarisse Ribeiro
- Centre of Physics of Universities of Minho and Porto (CF-UM-UP), University of Minho, Braga, Portugal.,Centre of Biological Engineering (CEB), University of Minho, Braga, Portugal
| | - Senentxu Lanceros-Mendez
- Centre of Physics of Universities of Minho and Porto (CF-UM-UP), University of Minho, Braga, Portugal.,Basque Center for Materials, Applications and Nanostructures (BCMaterials), UPV/EHU Science Park, Leioa, Spain.,Basque Foundation for Science (Ikerbasque), Bilbao, Spain
| | - Artur Cavaco-Paulo
- Centre of Biological Engineering (CEB), University of Minho, Braga, Portugal
| | - Andreia Almeida
- Institute for Research and Innovation in Health (i3S), University of Porto, Porto, Portugal.,Institute of Biomedical Engineering (INEB), University of Porto, Porto, Portugal.,Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - José das Neves
- Institute for Research and Innovation in Health (i3S), University of Porto, Porto, Portugal.,Institute of Biomedical Engineering (INEB), University of Porto, Porto, Portugal
| | - Marlene Lúcio
- Centre of Physics of Universities of Minho and Porto (CF-UM-UP), University of Minho, Braga, Portugal.,Centre of Molecular and Environmental Biology (CBMA), University of Minho, Braga, Portugal
| | - Teresa Viseu
- Centre of Physics of Universities of Minho and Porto (CF-UM-UP), University of Minho, Braga, Portugal
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12
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McDonagh JL, Shkurti A, Bray DJ, Anderson RL, Pyzer-Knapp EO. Utilizing Machine Learning for Efficient Parameterization of Coarse Grained Molecular Force Fields. J Chem Inf Model 2019; 59:4278-4288. [PMID: 31549507 DOI: 10.1021/acs.jcim.9b00646] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We present a machine learning approach to automated force field development in dissipative particle dynamics (DPD). The approach employs Bayesian optimization to parametrize a DPD force field against experimentally determined partition coefficients. The optimization process covers a discrete space of over 40 000 000 points, where each point represents the set of potentials that jointly forms a force field. We find that Bayesian optimization is capable of reaching a force field of comparable performance to the current state-of-the-art within 40 iterations. The best iteration during the optimization achieves an R2 of 0.78 and an RMSE of 0.63 log units on the training set of data, these metrics are maintained when a validation set is included, giving R2 of 0.8 and an RMSE of 0.65 log units. This work hence provides a proof-of-concept, expounding the utility of coupling automated and efficient global optimization with a top down data driven approach to force field parametrization. Compared to commonly employed alternative methods, Bayesian optimization offers global parameter searching and a low time to solution.
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Affiliation(s)
- James L McDonagh
- IBM Research U.K. , Hartree Centre, Daresbury WA4 4AD , United Kingdom
| | - Ardita Shkurti
- STFC Daresbury Laboratories , Daresbury WA4 4AD , United Kingdom
| | - David J Bray
- STFC Daresbury Laboratories , Daresbury WA4 4AD , United Kingdom
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Silva J, Mesquita R, Pinho E, Caldas A, Oliveira MECDR, Lopes CM, Lúcio M, Soares G. Incorporation of lipid nanosystems containing omega-3 fatty acids and resveratrol in textile substrates for wound healing and anti-inflammatory applications. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-1049-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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14
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Parreira RLT, Costa ES, Heleno VCG, Magalhães LG, Souza JM, Pauletti PM, Cunha WR, Januário AH, Símaro GV, Bastos JK, Laurentiz RS, Kar T, Caramori GF, Kawano DF, Andrade E Silva ML. Evaluation of Lignans from Piper cubeba against Schistosoma mansoni Adult Worms: A Combined Experimental and Theoretical Study. Chem Biodivers 2018; 16:e1800305. [PMID: 30335227 DOI: 10.1002/cbdv.201800305] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 10/17/2018] [Indexed: 01/01/2023]
Abstract
Six dibenzylbutyrolactonic lignans ((-)-hinokinin (1), (-)-cubebin (2), (-)-yatein (3), (-)-5-methoxyyatein (4), dihydrocubebin (5) and dihydroclusin (6)) were isolated from Piper cubeba seed extract and evaluated against Schistosoma mansoni. All lignans, except 5, were able to separate the adult worm pairs and reduce the egg numbers during 24 h of incubation. Lignans 1, 3 and 4 (containing a lactone ring) were the most efficient concerning antiparasitary activity. Comparing structures 3 and 4, the presence of the methoxy group at position 5 appears to be important for this activity. Considering 1 and 3, it is possible to see that the substitution pattern change (methylenedioxy or methoxy groups) in positions 3' and 4' alter the biological response, with 1 being the second most active compound. Computational calculations suggest that the activity of compound 4 can be correlated with the largest lipophilicity value.
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Affiliation(s)
- Renato L T Parreira
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, 14404-600 Franca, São Paulo, Brazil
| | - Eveline S Costa
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, 14404-600 Franca, São Paulo, Brazil
| | - Vladimir C G Heleno
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, 14404-600 Franca, São Paulo, Brazil
| | - Lizandra G Magalhães
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, 14404-600 Franca, São Paulo, Brazil
| | - Julia M Souza
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, 14404-600 Franca, São Paulo, Brazil
| | - Patrícia M Pauletti
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, 14404-600 Franca, São Paulo, Brazil
| | - Wilson R Cunha
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, 14404-600 Franca, São Paulo, Brazil
| | - Ana H Januário
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, 14404-600 Franca, São Paulo, Brazil
| | - Guilherme V Símaro
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, 14404-600 Franca, São Paulo, Brazil
| | - Jairo K Bastos
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café s/n, 14040-903 Ribeirão Preto, São Paulo, Brazil
| | - Rosangela S Laurentiz
- Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista Júlio de Mesquita Filho, Avenida Brasil 56, 15385-000 Ilha Solteira, São Paulo, Brazil
| | - Tapas Kar
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah, 84322-0300, USA
| | - Giovanni F Caramori
- Departamento de Química, Universidade Federal de Santa Catarina, Campus Universitário Trindade, 88040-900, CP 476 Florianópolis, Santa Catarina, Brazil
| | - Daniel Fábio Kawano
- Universidade de Campinas, Faculdade de Ciências Farmacêuticas, Rua Cândido Portinari 200, 13083-871 Campinas, São Paulo, Brazil
| | - Márcio L Andrade E Silva
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, 14404-600 Franca, São Paulo, Brazil
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15
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Preparation and evaluation of surface-bonded phenylglycine zwitterionic stationary phase. Anal Bioanal Chem 2018; 410:5941-5950. [DOI: 10.1007/s00216-018-1211-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 06/13/2018] [Accepted: 06/20/2018] [Indexed: 01/07/2023]
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16
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Lee Y, Cui M, Choi J, Kim J, Son Y, Khim J. Degradation of polychlorinated dibenzo-p-dioxins and dibenzofurans in real-field soil by an integrated visible-light photocatalysis and solvent migration system with p-n heterojunction BiVO 4/Bi 2O 3. JOURNAL OF HAZARDOUS MATERIALS 2018; 344:1116-1125. [PMID: 30216971 DOI: 10.1016/j.jhazmat.2017.12.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 11/09/2017] [Accepted: 12/01/2017] [Indexed: 06/08/2023]
Abstract
Degradation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in real-field soil was conducted using an integrated photocatalysis-solvent migration system of BiVO4/Bi2O3 and n-hexane. The photocatalyst BiVO4/Bi2O3 was synthesized, and its performance was found to be affected by the BiVO4 content, with 20wt% BiVO4 showing the best performance owing to its p-n heterojunction being well formed. Migration was affected by the amount of n-hexane, with 15% n-hexane giving the most effective transportation of PCDD/Fs. 37.2% of 17 PCDD/Fs was removed in 60h by the integrated photocatalysis-solvent migration system, although the reaction zone covered 8.5% of the volume of the soil. The result showed that migration via n-hexane fulfilled the aim of carrying contaminants from inside of the soil to the surface. Electron-scavenging experiments with BiVO4/Bi2O3 showed an 18.4% of performance in removal compared to no-scavenging condition, which showed that the main reactions driving BiVO4/Bi2O3 visible-light photocatalysis for aryl-chloride were found to be reduction-based. Owing to the hindering effect of Cl atoms, degradation by hydroxyl radical could proceed after initial dechlorination. This study establishes the applicability of integrated photocatalysis-solvent migration systems in real-field settings, and is the first report of a visible-light photocatalyst, BiVO4/Bi2O3, for the degradation of PCDD/Fs in soil.
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Affiliation(s)
- Yonghyeon Lee
- School of Civil, Environmental and Architectural Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Mingcan Cui
- School of Civil, Environmental and Architectural Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jongbok Choi
- School of Civil, Environmental and Architectural Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jeonggwan Kim
- Korea Environmental Industry & Technology Institute, 215, Jinheung-ro, Eunpyeong-gu, Seoul 03367, Republic of Korea
| | - Younggyu Son
- Department of Environmental Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi, Gyeongsangbuk-do 39177, Republic of Korea
| | - Jeehyeong Khim
- School of Civil, Environmental and Architectural Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
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17
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Estimation of descriptors for hydrogen-bonding compounds from chromatographic and liquid-liquid partition measurements. J Chromatogr A 2017; 1526:13-22. [DOI: 10.1016/j.chroma.2017.10.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 10/10/2017] [Accepted: 10/12/2017] [Indexed: 02/05/2023]
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18
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Xue J, Liao C, Wang J, Cryder Z, Xu T, Liu F, Gan J. Development of passive samplers for in situ measurement of pyrethroid insecticides in surface water. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 224:516-523. [PMID: 28259582 DOI: 10.1016/j.envpol.2017.02.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Revised: 02/15/2017] [Accepted: 02/16/2017] [Indexed: 05/15/2023]
Abstract
Pyrethroid insecticides are widely used in urban environments, and their occurrence has been recently associated with aquatic toxicity in urban surface streams. Synthetic pyrethroids are strongly hydrophobic compounds, highlighting the importance of the freely dissolved concentration (Cfree), rather than the total chemical concentration, for better prediction of potential effects in aquatic ecosystems. The goal of this study was to develop a simple, robust and field-applicable passive sampling methodology that may be used for in situ monitoring of trace levels of pyrethroids in surface water. Among a range of polymer films, polyethylene film (PE) was found to be the most efficient at absorbing pyrethroids from water. To circumvent the long equilibrium time, 13C-permethrin and bifenthrin-d5 were preloaded on the PE sampler as performance reference compounds (PRC). Desorption of isotope-labeled PRCs was found to be isotropic to the absorption of target analytes. The optimized method was first tested in large circulating tanks simulating various environmental conditions. The derived Cfree values were consistently smaller than the total aqueous concentration in salt water or water containing humic acids. The PE samplers were further deployed at multiple field sites for 7 d in Southern California and analysis demonstrated good monitoring reproducibility and sensitivity under ambient environmental conditions. The developed passive sampler approach is ideal for application for in situ sampling under field conditions, and the use of PRCs allows sampling with short and flexible time intervals.
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Affiliation(s)
- Jiaying Xue
- Department of Environmental Science, University of California, Riverside, CA 92521, USA; College of Resource and Environment, Anhui Agricultural University, Key Laboratory of Agri-food Safety of Anhui Province, Hefei 230036, China; Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100192, China
| | - Chunyang Liao
- Department of Environmental Science, University of California, Riverside, CA 92521, USA
| | - Jie Wang
- Department of Environmental Science, University of California, Riverside, CA 92521, USA
| | - Zachary Cryder
- Department of Environmental Science, University of California, Riverside, CA 92521, USA
| | - Tianbo Xu
- Bayer CropScience, 2 T. W. Alexander Drive, Research Triangle Park, NC 27709, USA
| | - Fengmao Liu
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100192, China
| | - Jay Gan
- Department of Environmental Science, University of California, Riverside, CA 92521, USA.
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19
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Genheden S. Predicting Partition Coefficients with a Simple All-Atom/Coarse-Grained Hybrid Model. J Chem Theory Comput 2015; 12:297-304. [PMID: 26592737 DOI: 10.1021/acs.jctc.5b00963] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The solvation free energy is an essential quantity in force field development and in numerous applications. Here, we present the estimation of solvation free energies in polar (water, hexanol, octanol, and nonanol) and in apolar (hexane, octane, and nonane) media. The estimates are produced using molecular dynamics simulations employing a simple all-atom/coarse-grained hybrid model (AA/ELBA) and are therefore very efficient. More than 150 solutes were taken from the Minnesota solvation database and represent small, organic molecules. The mean absolute deviation for the different solvents ranges between 2.0 and 4.1 kJ/mol, and the correlation coefficient ranges between 0.78 and 0.99, indicating that the predictions are accurate. Outliers are identified, and potential avenues for improvements are discussed. Furthermore, partition coefficients between water and the organic solvents were estimated, and the percentage of the predictions that has the correct sign ranges between 74% (for octane) and 92% (for octanol and hexanol). Finally, membrane/water partition coefficients are replaced with hexane/water and octanol/water partition coefficients, and the latter is found to be as accurate as the expensive membrane calculations, indicating a wider application area.
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Affiliation(s)
- Samuel Genheden
- Department of Chemistry and Molecular Biology, University of Gothenburg , Box 462, SE-405 30 Göteborg, Sweden
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20
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Jiao L, Bing S, Wang X, Xia D, Li H. Predicting the Aqueous Solubility of PCDD/Fs by using QSPR Method Based on the Molecular Distance-Edge Vector Index. Polycycl Aromat Compd 2015. [DOI: 10.1080/10406638.2015.1028588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Long Jiao
- College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, P.R. China
| | - Shan Bing
- College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, P.R. China
| | - Xiaofei Wang
- College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, P.R. China
| | - Donghui Xia
- School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Hua Li
- College of Chemistry and Materials Science, Northwest University, Xi’an, P.R. China
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21
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Jensen DA, Gary RK. Estimation of alkane–water logP for neutral, acidic, and basic compounds using an alkylated polystyrene-divinylbenzene high-performance liquid chromatography column. J Chromatogr A 2015; 1417:21-9. [DOI: 10.1016/j.chroma.2015.09.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Revised: 09/05/2015] [Accepted: 09/07/2015] [Indexed: 12/30/2022]
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22
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Moldoveanu S, David V. Estimation of the phase ratio in reversed-phase high-performance liquid chromatography. J Chromatogr A 2015; 1381:194-201. [DOI: 10.1016/j.chroma.2015.01.034] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 01/12/2015] [Accepted: 01/13/2015] [Indexed: 10/24/2022]
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23
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Jiao L, Wang X, Bing S, Xue Z, Li H. QSPR study on the photolysis half-life of PCDD/Fs adsorbed on spruce (Picea abies (L.) Karst.) needle surfaces under sunlight irradiation by using a molecular distance-edge vector index. RSC Adv 2015. [DOI: 10.1039/c4ra14178d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
QSPR study on the photolysis half-life of PCDD/Fs adsorbed to spruce (Picea abies (L.) Karst.) needle surfaces under sunlight irradiation.
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Affiliation(s)
- Long Jiao
- College of Chemistry and Chemical Engineering
- Xi'an Shiyou University
- Xi'an 710065
- P. R. China
- College of Chemistry and Materials Science
| | - Xiaofei Wang
- College of Chemistry and Chemical Engineering
- Xi'an Shiyou University
- Xi'an 710065
- P. R. China
| | - Shan Bing
- College of Chemistry and Chemical Engineering
- Xi'an Shiyou University
- Xi'an 710065
- P. R. China
| | - Zhiwei Xue
- No. 203 Research Institute of Nuclear Industry
- Xian yang 712000
- P. R. China
| | - Hua Li
- College of Chemistry and Materials Science
- Northwest University
- Xi'an 710069
- P. R. China
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24
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Vikas, Chayawan. Single-descriptor based quantum-chemical QSPRs for physico-chemical properties of polychlorinated-dibenzo-p-dioxins and -dibenzo-furans (PCDD/Fs): exploring the role of electron-correlation. CHEMOSPHERE 2015; 118:239-245. [PMID: 25282689 DOI: 10.1016/j.chemosphere.2014.08.072] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 08/21/2014] [Accepted: 08/25/2014] [Indexed: 06/03/2023]
Abstract
In this work, we propose and analyze single-descriptor based quantitative structure-property relationships (QSPRs) developed using quantum-chemical descriptors and their electron-correlation contribution, for various physico-chemical properties, namely, aqueous solubility, subcooled liquid vapour pressure, n-octanol/water and n-octanol/air partition coefficients of polychlorinated-dibenzo-p-dioxins (PCDDs) and -dibenzo-furans (PCDFs). The predictivity of the developed QSPRs is examined through external validation procedures employing an external prediction set of chemicals not used in the QSPR model development. From the comparison of different models, it is observed that the total energy and the mean polarizability of a molecule are highly significant in determining the predictivity of a QSPR, whereas dipole moment is found to be a poor descriptor in the models developed for all the properties analyzed. Besides these, the electron density based descriptors, namely, absolute electronegativity and electrophilicity index, were also observed to be highly influential in determining the external prediction for partition coefficients.
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25
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Nakamura K, Nakamura H, Saito S, Shibukawa M. Surface-Bubble-Modulated Liquid Chromatography: A New Approach for Manipulation of Chromatographic Retention and Investigation of Solute Distribution at Water/Hydrophobic Interfaces. Anal Chem 2014; 87:1180-7. [DOI: 10.1021/ac503802q] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Keisuke Nakamura
- Graduate School of Science
and Technology, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Hiroki Nakamura
- Graduate School of Science
and Technology, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Shingo Saito
- Graduate School of Science
and Technology, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Masami Shibukawa
- Graduate School of Science
and Technology, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan
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26
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Arnarez C, Uusitalo JJ, Masman MF, Ingólfsson HI, de Jong DH, Melo MN, Periole X, de Vries AH, Marrink SJ. Dry Martini, a Coarse-Grained Force Field for Lipid Membrane Simulations with Implicit Solvent. J Chem Theory Comput 2014; 11:260-75. [DOI: 10.1021/ct500477k] [Citation(s) in RCA: 200] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Clément Arnarez
- Groningen Biomolecular Sciences
and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747
AG Groningen, The Netherlands
| | - Jaakko J. Uusitalo
- Groningen Biomolecular Sciences
and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747
AG Groningen, The Netherlands
| | - Marcelo F. Masman
- Groningen Biomolecular Sciences
and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747
AG Groningen, The Netherlands
| | - Helgi I. Ingólfsson
- Groningen Biomolecular Sciences
and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747
AG Groningen, The Netherlands
| | - Djurre H. de Jong
- Groningen Biomolecular Sciences
and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747
AG Groningen, The Netherlands
| | - Manuel N. Melo
- Groningen Biomolecular Sciences
and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747
AG Groningen, The Netherlands
| | - Xavier Periole
- Groningen Biomolecular Sciences
and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747
AG Groningen, The Netherlands
| | - Alex H. de Vries
- Groningen Biomolecular Sciences
and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747
AG Groningen, The Netherlands
| | - Siewert J. Marrink
- Groningen Biomolecular Sciences
and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747
AG Groningen, The Netherlands
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27
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Sorption of hydrophobic organic compounds on natural sorbents and organoclays from aqueous and non-aqueous solutions: a mini-review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2014; 11:5020-48. [PMID: 24821385 PMCID: PMC4053894 DOI: 10.3390/ijerph110505020] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 04/16/2014] [Accepted: 04/30/2014] [Indexed: 12/04/2022]
Abstract
Renewed focus on the sorption of hydrophobic organic chemicals (HOCs) onto mineral surfaces and soil components is required due to the increased and wider range of organic pollutants being released into the environment. This mini-review examines the possibility of the contribution and mechanism of HOC sorption onto clay mineral sorbents such as kaolinite, and soil organic matter and the possible role of both in the prevention of environmental contamination by HOCs. Literature data indicates that certain siloxane surfaces can be hydrophobic. Therefore soils can retain HOCs even at low soil organic levels and the extent will depend on the structure of the pollutant and the type and concentration of clay minerals in the sorbent. Clay minerals are wettable by nonpolar solvents and so sorption of HOCs onto them from aqueous and non-aqueous solutions is possible. This is important for two reasons: firstly, the movement and remediation of soil environments will be a function of the concentration and type of clay minerals in the soil. Secondly, low-cost sorbents such as kaolinite and expandable clays can be added to soils or contaminated environments as temporary retention barriers for HOCs. Inorganic cations sorbed onto the kaolinite have a strong influence on the rate and extent of sorption of hydrophobic organic pollutants onto kaolinite. Structural sorbate classes that can be retained by the kaolinite matrix are limited by hydrogen bonding between hydroxyl groups of the octahedral alumosilicate sheet and the tetrahedral sheet with silicon. Soil organic carbon plays a key role in the sorption of HOCs onto soils, but the extent will be strongly affected by the structure of the organic soil matter and the presence of soot. Structural characterisation of soil organic matter in a particular soil should be conducted during a particular contamination event. Contamination by mining extractants and antibiotics will require renewed focus on the use of the QSAR approaches in the context of the sorption of HOCs onto clay minerals from aqueous and non-aqueous solutions.
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28
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Sedov IA, Solomonov BN. Solvophobic effects: Qualitative determination and quantitative description. J STRUCT CHEM+ 2014. [DOI: 10.1134/s0022476613080076] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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29
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Moldoveanu SC, David V. Dependence of the distribution constant in liquid-liquid partition equilibria on the van der Waals molecular surface area. J Sep Sci 2013; 36:2963-78. [DOI: 10.1002/jssc.201300330] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Revised: 05/13/2013] [Accepted: 06/11/2013] [Indexed: 11/10/2022]
Affiliation(s)
| | - Victor David
- Faculty of Chemistry, Department of Analytical Chemistry; University of Bucharest; Bucharest Romania
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30
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Zayats MF, Leschev SM, Petrashkevich NV, Zayats MA, Kadenczki L, Szitás R, Szemán Dobrik H, Keresztény N. Distribution of pesticides in n-hexane/water and n-hexane/acetonitrile systems and estimation of possibilities of their extraction isolation and preconcentration from various matrices. Anal Chim Acta 2013; 774:33-43. [PMID: 23567114 DOI: 10.1016/j.aca.2013.03.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 02/26/2013] [Accepted: 03/01/2013] [Indexed: 10/27/2022]
Abstract
Distribution of 150 most widely used pesticides of different chemical classes (amides, anilinopirimidines, aromatics, benzenesulfonates, carbamates, dicarboximides, organophosphorus compounds, phenyl esters, phenylureas, pyrazoles, pyrethroids, pyrimidines, strobilurins, sulfamides, triazines, triazoles, etc.) in n-hexane/water and n-hexane/acetonitrile systems was investigated at 25°C. Distribution constants of pesticides (P) have been calculated as ratio of pesticide concentration in n-hexane to its concentration in water or acetonitrile phase. HPLC and GC methods were used for pesticides determination in phases. It was found that the overwhelming majority of pesticides are hydrophobic, i.e. in n-hexane/water system LgP≫0, and the difference in LgP values can reach 9.1 units. Replacement of water for acetonitrile leads to dramatic fall of LgP values reaching 9.5 units. The majority of LgP values in this case are negative and their differences is strongly leveled in comparison with a hexane/water system. Thus, maximal difference in pesticides LgP values for n-hexane/acetonitrile system is 3.2 units. It is shown that n-hexane can be used for selective and efficient extraction and preconcentration of pesticides from water matrices. On the other hand, acetonitrile is effective for the isolation and preconcentration of pesticides from hydrocarbon and vegetable oil matrices. The distribution constants described in the paper may be effectively used for the estimation of possibilities of extraction isolation, preconcentration and separation of pesticides.
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Affiliation(s)
- M F Zayats
- RUE Institute of Plant Protection, Minsk, Belarus.
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31
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Doi H, Aida M. Hydration of Adamantane Skeleton: Water Assembling around Amantadine and Halo-substituted Adamantanes. CHEM LETT 2013. [DOI: 10.1246/cl.2013.292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hideo Doi
- Center for Quantum Life Sciences (QuLiS), Hiroshima University
- Department of Chemistry, Graduate School of Science, Hiroshima University
| | - Misako Aida
- Center for Quantum Life Sciences (QuLiS), Hiroshima University
- Department of Chemistry, Graduate School of Science, Hiroshima University
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32
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Kushakova AS, Zenkevich IG. Use of the hexane-2,2,2-trifluoroethanol system in partition chromatography. JOURNAL OF ANALYTICAL CHEMISTRY 2013. [DOI: 10.1134/s1061934813020196] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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33
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Liu J, Tang J, He H, Cai LL, Huang Y, Wei X, Luo M, Wang B, Gao X, Yang C, Hu T, Song X, Yi T, Yang L, Xie Y, Tong A, Gou L, Zhao Y, Zheng Y. Preparation of the thienopyridine derivatives loaded liposomes and study on the effect of compound-lipid interaction on release behavior. Drug Deliv 2012; 19:247-54. [PMID: 22823892 DOI: 10.3109/10717544.2012.699983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The article describes characterization of two liposome formulations containing thienopyridine derivatives, namely TP-58 and TP-67. By preparing the liposomes, the concentration of the two compounds in ultrapure water was increased up to three orders of magnitude. After i.v. administration of the liposomes in rats, the initial compound plasma concentrations were enhanced more than fifty times relative to that after i.g. administration of the compound suspensions. It was found out that the release rate of TP-67 from the liposome both in vitro and in vivo was not significantly different from that of TP-58. TP-58 was more lipophilic than TP-67 according to partition coefficiency, and TP-67 had greater polarity than TP-58 based on polar surface area (PSA). With DSC, it was found out that the interaction magnitude between TP-67 and the lipid bilayer was not significantly different from that between TP-58 and the lipid bilayer, which accounted for the similarity of the two compounds in release rate both in vitro and in vivo. It indicated liposome can be used as a potential carrier for broading the application of TP-58 and TP-67. Interaction between the thienopyridine derivatives and the lipid bilayer is probably the decisive factor for compound release from the liposomes.
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Affiliation(s)
- Jing Liu
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan, China
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Sasaki T, Tanaka S. Adsorption behavior of some aromatic compounds on hydrophobic magnetite for magnetic separation. JOURNAL OF HAZARDOUS MATERIALS 2011; 196:327-334. [PMID: 21962863 DOI: 10.1016/j.jhazmat.2011.09.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2011] [Revised: 09/08/2011] [Accepted: 09/09/2011] [Indexed: 05/31/2023]
Abstract
In this study, a hydrophobic magnetite coated with an alkyl chain or a phenyl group on the surface was prepared and used as an adsorbent to investigate the adsorption behavior of aromatic compounds having various values of log P(ow) (phenol 1.46, benzonitrile 1.56, nitrobenzene 1.86, benzene 2.13, toluene 2.73, chlorobenzene 2.84 and o-dichlorobenzene 3.38) onto hydrophobic magnetite. The hydrophobic magnetites were modified with stearic acid and phenyltrimethoxysilane, and the modification amounts were 9.84 × 10(-3) and 4.17 × 10(-2)mmol/g, respectively. The aromatic compounds used in this study were divided into 3 groups depending on the log P(ow): 1<log P(ow)<2, 2<log P(ow)<3 and 3<log P(ow). The adsorption amounts of above each group on the magnetite at an initial concentration of 100 ppm were 3.62 × 10(-3) (nitrobenzene), 1.92 × 10(-2) (phenol), 1.13 × 10(-1) (chlorobenzene), 2.42 × 10(-1) (benzene), and 3.10 × 10(-1)mmol/g (dichlorobenzene), respectively. This indicates that the adsorption behaviors depend on the strength of hydrophobicity of aromatic compounds. The adsorption mechanism for 2<log P(ow)<3 and 3<log P(ow) is hydrophobic interaction and that for 1<log P(ow)<2 is π-electron interaction. The quantitative relationship between the amount of adsorbed compounds and modified functional groups and the fitting for adsorption isotherm models suggested that this adsorption might form a multi-layer adsorption in the most cases.
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Affiliation(s)
- Takahiro Sasaki
- Division of Environmental Material Science, Graduate School of Environmental Science, Hokkaido University, Sapporo, Hokkaido, 060-0810, Japan.
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Qandil AM, El Mohtadi FH, Tashtoush BM. Chemical and in vitro enzymatic stability of newly synthesized celecoxib lipophilic and hydrophilic amides. Int J Pharm 2011; 416:85-96. [DOI: 10.1016/j.ijpharm.2011.06.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Revised: 06/06/2011] [Accepted: 06/09/2011] [Indexed: 12/20/2022]
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Garrido NM, Economou IG, Queimada AJ, Jorge M, Macedo EA. Prediction of then-hexane/water and 1-octanol/water partition coefficients for environmentally relevant compounds using molecular simulation. AIChE J 2011. [DOI: 10.1002/aic.12718] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Garrido NM, Jorge M, Queimada AJ, Macedo EA, Economou IG. Using molecular simulation to predict solute solvation and partition coefficients in solvents of different polarity. Phys Chem Chem Phys 2011; 13:9155-64. [DOI: 10.1039/c1cp20110g] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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DeVane R, Klein ML, Chiu CC, Nielsen SO, Shinoda W, Moore PB. Coarse-Grained Potential Models for Phenyl-Based Molecules: I. Parametrization Using Experimental Data. J Phys Chem B 2010; 114:6386-93. [DOI: 10.1021/jp9117369] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Russell DeVane
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, Department of Chemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan, and Department of Chemistry & Biochemistry, University of the
| | - Michael L. Klein
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, Department of Chemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan, and Department of Chemistry & Biochemistry, University of the
| | - Chi-cheng Chiu
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, Department of Chemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan, and Department of Chemistry & Biochemistry, University of the
| | - Steven O. Nielsen
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, Department of Chemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan, and Department of Chemistry & Biochemistry, University of the
| | - Wataru Shinoda
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, Department of Chemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan, and Department of Chemistry & Biochemistry, University of the
| | - Preston B. Moore
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, Department of Chemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan, and Department of Chemistry & Biochemistry, University of the
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Fernandez LA, Harvey CF, Gschwend PM. Using performance reference compounds in polyethylene passive samplers to deduce sediment porewater concentrations for numerous target chemicals. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:8888-94. [PMID: 19943662 DOI: 10.1021/es901877a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Polymeric passive samplers are useful for assessing hydrophobic organic chemical contamination in sediment beds. Here, an improved method is described for measuring concentrations of contaminants in porewater by using performance reference compounds (deuterated phenanthrene, pyrene, and chrysene) to calibrate sampler/site-specific mass transfer behavior. The method employs a one-dimensional diffusion model of chemical exchange between a polymer sheet of finite thickness and an unmixed sediment bed. The model is parametrized by diffusivities and partition coefficients for both the sampler and sediment. This method was applied to estimate porewater concentrations for seventeen PAHs from polymeric samplers deployed for 3-10 days in homogenized sediment from a coal-tar contaminated site. The accuracy of the method was verified by comparing the passive sampler results to concentrations measured through liquid-liquid extraction of physically separated porewaters, with corrections for sorption to colloidal organic carbon. The measurements made using the two methods matched within about a factor of 2.0 (+/-0.9) for the 17 target PAHs.
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Affiliation(s)
- Loretta A Fernandez
- Ralph M. Parsons Laboratory, MIT 48-411, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
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A new approach on estimation of solubility and n-octanol/water partition coefficient for organohalogen compounds. Int J Mol Sci 2009; 9:962-977. [PMID: 19325840 PMCID: PMC2658778 DOI: 10.3390/ijms9060962] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2008] [Revised: 05/19/2008] [Accepted: 05/19/2008] [Indexed: 11/24/2022] Open
Abstract
The aqueous solubility (logW) and n-octanol/water partition coefficient (logPOW) are important properties for pharmacology, toxicology and medicinal chemistry. Based on an understanding of the dissolution process, the frontier orbital interaction model was suggested in the present paper to describe the solvent-solute interactions of organohalogen compounds and a general three-parameter model was proposed to predict the aqueous solubility and n-octanol/water partition coefficient for the organohalogen compounds containing nonhydrogen-binding interactions. The model has satisfactory prediction accuracy. Furthermore, every item in the model has a very explicit meaning, which should be helpful to understand the structure-solubility relationship and may be provide a new view on estimation of solubility.
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Paasivirta J, Sinkkonen S, Nikiforov V, Kryuchkov F, Kolehmainen E, Laihia K, Valkonen A, Lahtinen M. Long-range atmospheric transport of three toxaphene congeners across Europe. Modeling by chained single-box FATEMOD program. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2009; 16:191-205. [PMID: 19132429 DOI: 10.1007/s11356-008-0084-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2008] [Accepted: 10/27/2008] [Indexed: 05/25/2023]
Abstract
BACKGROUND, AIMS, AND SCOPE Since toxaphene (polychlorocamphene, polychloropinene, or strobane) mixtures were applied for massive insecticide use in the 1960s to replace the use of DDT, some of their congeners have been found at high latitudes far away from the usage areas. Especially polychlorinated bornanes have demonstrated dominating congeners transported by air up to the Arctic areas. Environmental fate modeling has been applied to monitor this phenomenon using parallel zones of atmosphere around the globe as interconnected environments. These zones, shown in many meteorological maps, however, may not be the best way to configure atmospheric transport in air trajectories. The latter could also be covered by connecting a chain of simple model boxes. We aim to study this alternative approach by modeling the trajectory chain using catchment boxes of our FATEMOD model. Polychlorobornanes analyzed in biota of the Barents Sea offered one case to study this modeling alternative, while toxaphene has been and partly still is used massively at southern East Europe and around rivers flowing to the Aral Sea. MATERIALS AND METHODS Pure model substances of three polychlorobornanes (toxaphene congeners P26, P50, and P62) were synthesized, their environmentally important thermal properties measured by differential scanning calorimetry, as evaluated from literature data, and their temperature dependences estimated by the QSPR programs VPLEST, WATSOLU, and TDLKOW. The evaluated property parameters were used to model their atmospheric long-range transport from toxaphene heavy usage areas in Ukraine and Aral/SyrDarja/AmuDarja region areas, through East Europe and Northern Norway (Finnmarken) to the Barents Sea. The time period used for the emission model was June 1997. Usual weather conditions in June were applied in the model, which was constructed by chaining FATEMOD model boxes of the catchment's areas along assumed maximal air flow trajectories. Analysis of the three chlorobornanes in toxaphene mixtures function as a basis for the estimates of emission levels caused by its usage. High estimate (A) was taken from contents in a Western product chlorocamphene and low estimate (B) from mean contents in Russian polychloroterpene products to achieve modeled water concentrations. Bioaccumulation to analyzed lipid of aquatic biota at the target region was estimated by using statistical calculation for persistent organic pollutants in literature. RESULTS The results from model runs A and B (high and low emission estimate) for levels in sea biota were compared to analysis results of samples taken in August 1997 at Barents Sea. The model results (ng g(-1) lw): 4-95 in lipid of planktovores and 7-150 in lipid of piscivores, were in fair agreement with the analysis results from August 1997: 21-31 in Themisto libellula (chatka), 26-42 in Boreocadus saida (Polar cod), and 5-27 in Gadus morhua (cod) liver. DISCUSSION The modeling results indicate that the application of chained simple multimedia catchment boxes on predicted trajectory is a useful method for estimation of volatile airborne persistent chemical exposures to biota in remote areas. For hazard assessment of these pollutants, their properties, especially temperature dependences, must be estimated by a reasonable accuracy. That can be achieved by using measurements in laboratory with pure model compounds and estimation of properties by thermodynamic QSPR methods. The property parameters can be validated by comparing their values at an environmental temperature range with measured or QSPR-estimated values derived by independent methods. The chained box method used for long-range air transport modeling can be more suitable than global parallel zones modeling used earlier, provided that the main airflow trajectories and properties of transported pollutants are predictable enough. CONCLUSIONS Long-range air transport modeling of persistent, especially photo-resistant organic compounds using a chain of joint simple boxes of catchment's environments is a feasible method to predict concentrations of pollutants at the target area. This is justified from model results compared with analytical measurements in Barents Sea biota in August 1997: three of six modeled values were high and the other three low compared to the analysis results. The order of magnitude level was similar in both modeled (planktovore and piscivore) and observed (chatka and polar cod) values of lipid samples. The obtained results were too limited to firm validation but are sufficient to justify feasibility of the method, which prompts one to perform more studies on this modeling system. RECOMMENDATIONS AND PERSPECTIVES For assessment of the risk of environmental damages, chemical fate determination is an essential tool for chemical control, e.g., for EU following the REACH rules. The present conclusion of applicability of the chained single-box multimedia modeling can be validated by further studies using analyses of emissions and target biota in various other cases. To achieve useful results, fate models built with databases having automatic steps for most calculations and outputs accessible to all chemical control professionals are essential. Our FATEMOD program catchments at environments and compound properties listed in the database represent a feasible tool for local, regional, and, according our present test results, for global exposure predictions. As an extended use of model, emission estimates can be achieved by reversed modeling from analysis results of samples corresponding to the target area.
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Affiliation(s)
- Jaakko Paasivirta
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, 40014, Jyväskylä, Finland.
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Fernandez LA, MacFarlane JK, Tcaciuc AP, Gschwend PM. Measurement of freely dissolved PAH concentrations in sediment beds using passive sampling with low-density polyethylene strips. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:1430-6. [PMID: 19350915 DOI: 10.1021/es802288w] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
To assess hydrophobic organic chemical (HOC) contamination in sediments, a method was developed using polyethylene (PE) passive samplers inserted directly in the intact sediment beds to measure freely dissolved HOC concentrations. Performance reference compounds (PRCs: d10-phenanthrene, d10-pyrene, and d12-chrysene), impregnated into the PE before use, allowed porewater concentrations to be deduced after exposure times much shorter than would be required for sampler equilibration (days instead of months). Three diverse sediments were used in the laboratory, and PE-deduced porewater concentrations of six native PAHs (phenanthrene, anthracene, fluoranthene, pyrene, benz(a)anthracene, and chrysene) matched results from air-bridge testing and from direct porewater extractions after correcting for colloid effects. PE strips, deployed from a boat in Boston Harbor, yielded concentrations that were like those measured in porewaters from a sediment core collected nearby. Notably, equilibrium partitioning (EqP) estimates were always much higher (up to 100x) than those measured using the other methods, suggesting the large inaccuracy of that approach. Hence, PE passive sampling appears to greatly improve the accuracy of assessing the hazards posed by compounds like PAHs in sediment beds.
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Affiliation(s)
- Loretta A Fernandez
- Ralph M. Parsons Laboratory, MIT 48-412, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
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Development and validation of a method for fipronil residue determination in ovine plasma using 96-well plate solid-phase extraction and gas chromatography-tandem mass spectrometry. J Chromatogr A 2008; 1201:91-9. [PMID: 18602111 DOI: 10.1016/j.chroma.2008.06.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2008] [Revised: 05/21/2008] [Accepted: 06/03/2008] [Indexed: 11/23/2022]
Abstract
Fipronil, a phenylpyrazole insecticide introduced for pest control on a broad range of crops, undergoes a reinforcement of the regulation within the European Union (2007/52/EC directive) due to its potential effects on environment and human health. In order to assess the plasmatic concentrations of fipronil residues (sulfone, sulfide, fipronil, desulfinyl and amide) in ovine, a methodology based on gas chromatography coupled with tandem mass spectrometry (GC-MS/MS) was developed and validated according to the European standard (2002/657/EC). The proposed method allows a large number of samples to be treated concurrently (n=80) using a reduced sample amounts (0.2 mL), and consents to reach a level of quantification of 0.1 pg microL(-1). The sample preparation consisted of a single solid-phase extraction (SPE) purification on a 96-well plate filled with a styrene-divinyl-benzene phase. Linearity was demonstrated all along the investigated range of concentrations, i.e. from 0.25 to 2000 pg microL(-1), with coefficient of determination (R(2)) from 0.977 to 0.994, depending on target analytes. Calculated decision limit (CCalpha) and detection capability (CCbeta) for fipronil, sulfone and sulphide were in the range 0.05-0.16 and 0.28-0.73 pg microL(-1) respectively.
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LIANG Y, CHEN H. Estimation of Octanol-Water Partition Coefficient of Chloride Hydrocarbon by Group Contribution Method. Chin J Chem Eng 2007. [DOI: 10.1016/s1004-9541(07)60151-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Jobbágy M, Regazzoni AE. Partition of non-ionic organics in hybrid-hydrotalcite/water systems. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.11.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Aajoud A, Raveton M, Aouadi H, Tissut M, Ravanel P. Uptake and xylem transport of fipronil in sunflower. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2006; 54:5055-60. [PMID: 16819916 DOI: 10.1021/jf0604081] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The phenylpyrazole insecticide, fipronil, is used in seed coating against Agriotes larvae, which infest mainly corn and sunflower. Coating the seeds of the cultivated plants with fipronil has proven its effectiveness against Agriotes populations. In the case of sunflower or even corn, the possible root uptake of this insecticide may lead to a toxic effect against pollinators such as honeybees. In the present report, the uptake and transport of fipronil inside the sunflower seedling was studied in the laboratory. In a first study, sunflower was cultivated on an aqueous medium containing fipronil. An intense root uptake of fipronil occurred, leading to a transport into leaves depending upon transpiration. In a second study, plants were cultivated on a soil in which fipronil was uniformly distributed. Under our soil conditions (20% organic carbon), the partition coefficient between soil and water (K(d)) was found to be equal to 386 +/- 30. The average rate of fipronil transfer from soil water to seedlings was from 2 to 2.6 times lower than water transfer. During the 3 week experiment, 55% of recovered labeled compounds was in the parent form and 35% had been converted to lipophilic metabolites, with either a 4-CF(3)-SO(2) or 4-CF(3)-S substituant, which are also very potent lipophilic insecticides. This paper suggests that the possible uptake of fipronil by sunflower seedlings under agronomic conditions is mainly controlled by the physicochemical characteristics of the seed-coating mixture.
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Affiliation(s)
- Asmae Aajoud
- Equipe Pertubations Environnementales et Xénobiotiques, Laboratoire d'Ecologie Alpine, Université Joseph Fourier, BP53X, F-38041 Grenoble Cedex 09, France
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Estimation of the aqueous solubility (−lgSw) of all polychlorinated dibenzo-furans (PCDF) and polychlorinated dibenzo-p-dioxins (PCDD) congeners by density functional theory. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.theochem.2006.03.027] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Han XY, Wang ZY, Zhai ZC, Wang LS. Estimation ofn-octanol/water Partition Coefficients (Kow) of all PCB Congeners by Ab initio and a Cl Substitution Position Method. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/qsar.200530141] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Okhapkin IM, Askadskii AA, Markov VA, Makhaeva EE, Khokhlov AR. Two-dimensional classification of amphiphilic monomers based on interfacial and partitioning properties. 2. Amino acids and amino acid residues. Colloid Polym Sci 2006. [DOI: 10.1007/s00396-005-1447-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Zhou W, Zhai Z, Wang Z, Wang L. Estimation of n-octanol/water partition coefficients (Kow) of all PCB congeners by density functional theory. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.theochem.2005.08.020] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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