2951
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Ozcan SG, Satiroglu N, Soylak M. Column solid phase extraction of iron(III), copper(II), manganese(II) and lead(II) ions food and water samples on multi-walled carbon nanotubes. Food Chem Toxicol 2010; 48:2401-6. [DOI: 10.1016/j.fct.2010.05.078] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 05/25/2010] [Accepted: 05/28/2010] [Indexed: 11/20/2022]
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2952
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2953
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Affiliation(s)
- Adina Negrea
- Faculty of Industrial Chemistry and Environmental Engineering, University “Politehnica” Timisoara, 2 Piata Victoriei, 300006 Timisoara, Romania
| | - Lavinia Lupa
- Faculty of Industrial Chemistry and Environmental Engineering, University “Politehnica” Timisoara, 2 Piata Victoriei, 300006 Timisoara, Romania
| | - Mihaela Ciopec
- Faculty of Industrial Chemistry and Environmental Engineering, University “Politehnica” Timisoara, 2 Piata Victoriei, 300006 Timisoara, Romania
| | - Radu Lazau
- Faculty of Industrial Chemistry and Environmental Engineering, University “Politehnica” Timisoara, 2 Piata Victoriei, 300006 Timisoara, Romania
| | - Cornelia Muntean
- Faculty of Industrial Chemistry and Environmental Engineering, University “Politehnica” Timisoara, 2 Piata Victoriei, 300006 Timisoara, Romania
| | - Petru Negrea
- Faculty of Industrial Chemistry and Environmental Engineering, University “Politehnica” Timisoara, 2 Piata Victoriei, 300006 Timisoara, Romania
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2954
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2955
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Huang HH, Camsund D, Lindblad P, Heidorn T. Design and characterization of molecular tools for a Synthetic Biology approach towards developing cyanobacterial biotechnology. Nucleic Acids Res 2010; 38:2577-93. [PMID: 20236988 PMCID: PMC2860132 DOI: 10.1093/nar/gkq164] [Citation(s) in RCA: 272] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Cyanobacteria are suitable for sustainable, solar-powered biotechnological applications. Synthetic biology connects biology with computational design and an engineering perspective, but requires efficient tools and information about the function of biological parts and systems. To enable the development of cyanobacterial Synthetic Biology, several molecular tools were developed and characterized: (i) a broad-host-range BioBrick shuttle vector, pPMQAK1, was constructed and confirmed to replicate in Escherichia coli and three different cyanobacterial strains. (ii) The fluorescent proteins Cerulean, GFPmut3B and EYFP have been demonstrated to work as reporter proteins in cyanobacteria, in spite of the strong background of photosynthetic pigments. (iii) Several promoters, like PrnpB and variants of PrbcL, and a version of the promoter Ptrc with two operators for enhanced repression, were developed and characterized in Synechocystis sp. strain PCC6803. (iv) It was shown that a system for targeted protein degradation, which is needed to enable dynamic expression studies, is working in Synechocystis sp. strain PCC6803. The pPMQAK1 shuttle vector allows the use of the growing numbers of BioBrick parts in many prokaryotes, and the other tools herein implemented facilitate the development of new parts and systems in cyanobacteria.
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Affiliation(s)
- Hsin-Ho Huang
- Department of Photochemistry and Molecular Science, Angström Laboratories, Uppsala University, P.O. Box 523, SE-751 20 Uppsala, Sweden
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2956
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Wahal S, Viamajala S. Maximizing Algal Growth in Batch Reactors Using Sequential Change in Light Intensity. Appl Biochem Biotechnol 2010; 161:511-22. [DOI: 10.1007/s12010-009-8891-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2009] [Accepted: 12/14/2009] [Indexed: 10/19/2022]
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2957
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Shokrolahi A, Ghaedi M, Shabani R, Montazerozohori M, Chehreh F, Soylak M, Alipour S. A preconcentration procedure for copper, nickel and chromium ions in some food and environmental samples on modified Diaion SP-850. Food Chem Toxicol 2010; 48:482-9. [DOI: 10.1016/j.fct.2009.10.040] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2009] [Revised: 10/16/2009] [Accepted: 10/27/2009] [Indexed: 11/27/2022]
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2958
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Teo CC, Tan SN, Yong JWH, Hew CS, Ong ES. Pressurized hot water extraction (PHWE). J Chromatogr A 2010; 1217:2484-94. [PMID: 20060531 DOI: 10.1016/j.chroma.2009.12.050] [Citation(s) in RCA: 264] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Revised: 12/16/2009] [Accepted: 12/21/2009] [Indexed: 02/07/2023]
Abstract
Pressurized hot water extraction (PHWE) has become a popular green extraction method for different classes of compounds present in numerous kinds of matrices such as environmental, food and botanical samples. PHWE is also used in sample preparation to extract organic contaminants from foodstuff for food safety analysis and soils/sediments for environmental monitoring purposes. The main parameters which influence its extraction efficiency are namely the temperature, extraction time, flow rates and addition of modifiers/additives. Among these different parameters studied, temperature is described as the most important one. It is reported that the extraction of certain compounds is rather dependent on pressurized water with different applied temperature. Thus, the stability and reduced solubilities of certain compounds at elevated temperatures are highlighted in this review. With some modifications, a scaled-up PHWE could extract a higher amount of desirable compounds from solid and powdered samples such as plant and food materials. The PHWE extracts from plants are rich in chemical compounds or metabolites which can be a potential lead for drug discovery or development of disease-resistant food crops.
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Affiliation(s)
- Chin Chye Teo
- Natural Sciences and Science Education Academic Group, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Singapore
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2959
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YABUTANI T, NAKAMOTO Y, YAMANOUCHI R, THUY LTX, MURAI KI, MOTONAKA J, OGAKI M, DANCILA MA, STANESCU R, PLESCA M. Multielemental Characterization of Airborne Particulate Matter Collected in Bucharest and Tokushima by Inductively Coupled Plasma Mass Spectrometry and Inductively Coupled Plasma Atomic Emission Spectrometry. ANAL SCI 2010; 26:395-400. [DOI: 10.2116/analsci.26.395] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Tomoki YABUTANI
- Department of Chemical Science and Technology, Institute of Science and Technology, The University of Tokushima
| | - Yumi NAKAMOTO
- Department of Chemical Science and Technology, Institute of Science and Technology, The University of Tokushima
| | - Ryoji YAMANOUCHI
- Department of Chemical Science and Technology, Institute of Science and Technology, The University of Tokushima
| | - Le Thi Xuan THUY
- Department of Chemical Science and Technology, Institute of Science and Technology, The University of Tokushima
| | - Kei-ichiro MURAI
- Department of Chemical Science and Technology, Institute of Science and Technology, The University of Tokushima
| | - Junko MOTONAKA
- Department of Chemical Science and Technology, Institute of Science and Technology, The University of Tokushima
| | - Mitsuharu OGAKI
- Department of Chemical Science and Technology, Institute of Science and Technology, The University of Tokushima
| | - Madelene Anette DANCILA
- Department of Inorganic Technology and Environmental Protection, Faculty of Industrial Chemistry, Polytechnic University of Bucharest
| | - Rodica STANESCU
- Department of Inorganic Technology and Environmental Protection, Faculty of Industrial Chemistry, Polytechnic University of Bucharest
| | - Marinela PLESCA
- Regional Environmental Protection Agency of Bucharest, Aleea Lacul Morii
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2960
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Hartmann M, Kullmann S, Keller H. Wastewater treatment with heterogeneous Fenton-type catalysts based on porous materials. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm00577k] [Citation(s) in RCA: 316] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2961
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2962
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Caroni A, de Lima C, Pereira M, Fonseca J. The kinetics of adsorption of tetracycline on chitosan particles. J Colloid Interface Sci 2009; 340:182-91. [DOI: 10.1016/j.jcis.2009.08.016] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2009] [Revised: 08/09/2009] [Accepted: 08/10/2009] [Indexed: 11/19/2022]
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2963
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Khan AI, Ragavan A, Fong B, Markland C, O’Brien M, Dunbar TG, Williams GR, O’Hare D. Recent Developments in the Use of Layered Double Hydroxides as Host Materials for the Storage and Triggered Release of Functional Anions. Ind Eng Chem Res 2009. [DOI: 10.1021/ie9012612] [Citation(s) in RCA: 112] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Aamir I. Khan
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K
| | - Anusha Ragavan
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K
| | - Bonnie Fong
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K
| | - Charles Markland
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K
| | - Mark O’Brien
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K
| | - Thomas G. Dunbar
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K
| | - Gareth R. Williams
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K
| | - Dermot O’Hare
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K
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2964
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Affiliation(s)
- Luminita Ghimici
- a Petru Poni Institute of Macromolecular Chemistry , Grigore Ghica Voda Alley , Iasi, Romania
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2965
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2966
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Long Z, Storey J, Lewis S, Sepaniak MJ. Landfill siloxane gas sensing using differentiating, responsive phase coated microcantilever arrays. Anal Chem 2009; 81:2575-80. [PMID: 19267478 DOI: 10.1021/ac802494v] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Landfill biogases are being utilized more frequently as a new source of fuel energy. Volatile siloxane compounds usually contained in landfill biogases will form siloxane residues when the gases are burned, which significantly increases abrasion of combustion engines. Research on detection of siloxanes in landfill gas has been active during recent years with the principal analytical technique being gas chromatography/mass spectrometry (GC/MS). In our present work, we introduce a less expensive, compact methodology that employs microcantilever (MC) arrays for sensitive nanomechanical-based gas-phase sensing of the siloxanes. The cantilevers on the MC array were differentially coated on the active, nanostructured side with different responsive phases, and composite responses (magnitude of siloxane-induced MC bending) for four siloxanes were collected that exhibited selective signatures to aid in recognizing each siloxane. Limits of detection (LODs) derived from linear calibration plots were down to the sub-parts-per-million range, a sensitivity that is comparable with that of GC/MS reported by other researchers. Studies were performed in rather inert helium environment and a realistic matrix, and the overall response profiles and LODs were similar for both matrixes. A 5 week long-term reproducibility study illustrates the stability of the MC array. Moreover, the portable character of the MC array setup makes our method a very promising way to facilitate in-field detection of siloxanes in landfill gas in the future.
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Affiliation(s)
- Zhou Long
- Department of Chemistry, University of Tennessee, Knoxville Tennessee 37996-1600, USA
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2967
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Abstract
This review details the most important achievements in the fi eld of ecological chemistry and environmental protection, obtained at the State University of Moldova and Institute of Chemistry of the Academy of Sciences of Moldova. The main research directions are described, as well as main scientific laboratories and centres of these two institutions.
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2968
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Ghimici L, Nichifor M, Wolf B. Ionic Polymers Based on Dextran: Hydrodynamic Properties in Aqueous Solution and Solvent Mixtures. J Phys Chem B 2009; 113:8020-5. [DOI: 10.1021/jp900690f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luminita Ghimici
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania, and Institute of Physical Chemistry, University of Mainz, Welder-Weg 13, D-55099 Mainz, Germany
| | - Marieta Nichifor
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania, and Institute of Physical Chemistry, University of Mainz, Welder-Weg 13, D-55099 Mainz, Germany
| | - Bernhard Wolf
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania, and Institute of Physical Chemistry, University of Mainz, Welder-Weg 13, D-55099 Mainz, Germany
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2969
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Solangi IB, Memon S, Bhanger M. Synthesis and application of a highly efficient tetraester calix[4]arene based resin for the removal of Pb2+ from aqueous environment. Anal Chim Acta 2009; 638:146-53. [DOI: 10.1016/j.aca.2009.02.026] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Revised: 02/12/2009] [Accepted: 02/13/2009] [Indexed: 11/22/2022]
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2970
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Untea I, Dancila M, Vasile E, Belcu M. Structural, morphological and textural modifications of ZnO–TiO2 HTGD based sorbents induced by Al2O3 addition, thermal treatment and sulfurizing process. POWDER TECHNOL 2009; 191:27-33. [DOI: 10.1016/j.powtec.2008.09.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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2971
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Abstract
Electrocoagulation (EC) is an electrochemical technique which has been employed in the treatment of various kinds of wastewater. In this work the potential use of EC for the treatment of palm oil mill effluent (POME) was investigated. In a laboratory scale, POME from a factory site in Chumporn Province (Thailand) was subjected to EC using aluminum as electrodes and sodium chloride as supporting electrolyte. Results show that EC can reduce the turbidity, acidity, COD, and BOD of the POME as well as some of its heavy metal contents. Phenolic compounds are also removed from the effluent. Recovery techniques were employed in the coagulated fraction and the recovered compounds was analysed for antioxidant activity by DPPH method. The isolate was found to have a moderate antioxidant activity. From this investigation, it can be concluded that EC is an efficient method for the treatment of POME.
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2972
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Abstract
A vast array of biological materials, especially bacteria, algae, yeasts and fungi have received increasing attention for heavy metal removal and recovery due to their good performance, low cost and large available quantities. The biosorbent, unlike mono functional ion exchange resins, contains variety of functional sites including carboxyl, imidazole, sulphydryl, amino, phosphate, sulfate, thioether, phenol, carbonyl, amide and hydroxyl moieties. Biosorbents are cheaper, more effective alternatives for the removal of metallic elements, especially heavy metals from aqueous solution. In this paper, based on the literatures and our research results, the biosorbents widely used for heavy metal removal were reviewed, mainly focusing on their cellular structure, biosorption performance, their pretreatment, modification, regeneration/reuse, modeling of biosorption (isotherm and kinetic models), the development of novel biosorbents, their evaluation, potential application and future. The pretreatment and modification of biosorbents aiming to improve their sorption capacity was introduced and evaluated. Molecular biotechnology is a potent tool to elucidate the mechanisms at molecular level, and to construct engineered organisms with higher biosorption capacity and selectivity for the objective metal ions. The potential application of biosorption and biosorbents was discussed. Although the biosorption application is facing the great challenge, there are two trends for the development of the biosorption process for metal removal. One trend is to use hybrid technology for pollutants removal, especially using living cells. Another trend is to develop the commercial biosorbents using immobilization technology, and to improve the biosorption process including regeneration/reuse, making the biosorbents just like a kind of ion exchange resin, as well as to exploit the market with great endeavor.
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Affiliation(s)
- Jianlong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China.
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2973
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Caşcaval D, Galaction A, Turnea M. Study of the influence of solute and carrier characteristics on facilitated pertraction mechanism in pseudosteady-state conditions. J Memb Sci 2009; 328:228-37. [DOI: 10.1016/j.memsci.2008.12.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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2974
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Miranda R, Negro C, Blanco A. Internal Treatment of Process Waters in Paper Production by Dissolved Air Flotation with Newly Developed Chemicals. 1. Laboratory Tests. Ind Eng Chem Res 2009. [DOI: 10.1021/ie801047h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ruben Miranda
- Department of Chemical Engineering, Faculty of Chemistry, Complutense University of Madrid, Avda. Complutense s/n 28040 Madrid, Spain
| | - Carlos Negro
- Department of Chemical Engineering, Faculty of Chemistry, Complutense University of Madrid, Avda. Complutense s/n 28040 Madrid, Spain
| | - Angeles Blanco
- Department of Chemical Engineering, Faculty of Chemistry, Complutense University of Madrid, Avda. Complutense s/n 28040 Madrid, Spain
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2975
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Ghimici L, Nichifor M. Transport properties of some cationic amphiphilic polysaccharides: Effects of the side-chain length and solvent polarity. J Appl Polym Sci 2009. [DOI: 10.1002/app.29370] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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2976
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2977
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Richert JC, Sneddon J. Determination of Heavy Metals in Crawfish (Procambrus clarkii) by Inductively Coupled Plasma–Optical Emission Spectrometry: A Study over the Season in Southwest Louisiana. ANAL LETT 2008. [DOI: 10.1080/00032710802462834] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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2978
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2979
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2980
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2981
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Gavrilescu M, Teodosiu C, Gavrilescu D, Lupu L. Strategies and Practices for Sustainable Use of Water in Industrial Papermaking Processes. Eng Life Sci 2008. [DOI: 10.1002/elsc.200720236] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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2982
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2983
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Girotti S, Ferri EN, Fumo MG, Maiolini E. Monitoring of environmental pollutants by bioluminescent bacteria. Anal Chim Acta 2007; 608:2-29. [PMID: 18206990 DOI: 10.1016/j.aca.2007.12.008] [Citation(s) in RCA: 177] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2007] [Revised: 12/06/2007] [Accepted: 12/09/2007] [Indexed: 11/18/2022]
Abstract
This review deals with the applications of bioluminescent bacteria to the environmental analyses, published during the years 2000-2007. The ecotoxicological assessment, by bioassays, of the environmental risks and the luminescent approaches are reported. The review includes a brief introduction to the characteristics and applications of bioassays, a description of the characteristics and applications of natural bioluminescent bacteria (BLB), and a collection of the main applications to organic and inorganic pollutants. The light-emitting genetically modified bacteria applications, as well as the bioluminescent immobilized systems and biosensors are outlined. Considerations about commercially available BLB and BLB catalogues are also reported. Most of the environmental applications, here mentioned, of luminescent organisms are on wastewater, seawater, surface and ground water, tap water, soil and sediments, air. Comparison to other bioindicators and bioassay has been also made. Various tables have been inserted, to make easier to take a rapid glance at all possible references concerning the topic of specific interest.
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Affiliation(s)
- Stefano Girotti
- Department of Metallurgic Science, Electrochemistry and Chemical Techniques, University of Bologna, Via S. Donato 15, 40127 Bologna, Italy.
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2984
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Bhadrinarayana NS, Basha CA, Anantharaman N. Electrochemical Oxidation of Cyanide and Simultaneous Cathodic Removal of Cadmium Present in the Plating Rinse Water. Ind Eng Chem Res 2007. [DOI: 10.1021/ie0704039] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- N. S. Bhadrinarayana
- Central Electrochemical Research Institute, Karaikudi 630 006, India, and National Institute of Technology, Tiruchirappalli 620 015, India
| | - C. Ahmed Basha
- Central Electrochemical Research Institute, Karaikudi 630 006, India, and National Institute of Technology, Tiruchirappalli 620 015, India
| | - N. Anantharaman
- Central Electrochemical Research Institute, Karaikudi 630 006, India, and National Institute of Technology, Tiruchirappalli 620 015, India
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2985
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Ghimici L, Nichifor M. Transport properties of some cationic polysaccharides. J Colloid Interface Sci 2006; 302:589-96. [PMID: 16889787 DOI: 10.1016/j.jcis.2006.06.073] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2006] [Revised: 06/29/2006] [Accepted: 06/29/2006] [Indexed: 11/28/2022]
Abstract
The charge density effect on the behavior of some cationic polysaccharides in aqueous and nonaqueous (methanol) solutions was studied by viscometric and conductometric measurements. The polyelectrolytes investigated contain quaternary ammonium salt groups, N-alkyl-N,N-dimethyl-2-hydroxypropylene ammonium chloride, attached to a dextran backbone. This new class of polyelectrolytes has various linear charge density parameters, xi, located below and above the critical threshold value of counterions condensation, xi(c)=1(xi=0.25-3.18). The viscometric data revealed that all copolymers exhibit a polyelectrolyte behavior and were plotted in the terms of Rao equation. The conductometric measurements of solutions of these copolymers were presented as a function of polymer concentration and charge density. The results were analyzed within the Manning's theory and lower experimental values of the equivalent conductivity than the theoretical ones were found. Possible reasons of this discrepancy have been discussed. The interaction parameters were evaluated and these were found to depend on both the polymer concentration and the charge density. The conductometric behavior of these cationic polysaccharides has shown that counterion condensation is not a threshold phenomenon, their association to the charged groups of the polyions taking place for xi>1 as well as xi<1.
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Affiliation(s)
- Luminita Ghimici
- "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iasi, Romania.
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2986
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Kazancev K, Makareviciene V, Paulauskas V, Janulis P. Cold flow properties of fuel mixtures containing biodiesel derived from animal fatty waste. EUR J LIPID SCI TECH 2006. [DOI: 10.1002/ejlt.200600074] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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2987
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2988
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2989
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