201
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Noritomi H, Chiba H, Kikuta M, Kato S. How can aprotic ionic liquids affect enzymatic enantioselectivity? ACTA ACUST UNITED AC 2013. [DOI: 10.4236/jbise.2013.610117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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202
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Moniruzzaman M, Ono T. Separation and characterization of cellulose fibers from cypress wood treated with ionic liquid prior to laccase treatment. BIORESOURCE TECHNOLOGY 2013; 127:132-137. [PMID: 23131633 DOI: 10.1016/j.biortech.2012.09.113] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Revised: 08/10/2012] [Accepted: 09/28/2012] [Indexed: 05/28/2023]
Abstract
Separation of cellulose fibers (CFs) from woody biomass with minimal structural alteration using a "green" and efficient method was achieved by treatment with the ionic liquid (IL), [emim][OAc] (1-ethyl-3-methylimidazolium acetate) at 80 °C for 1h. The IL was recovered by rinsing with water-acetone mixture prior to treatment of the wood with Trametes sp. laccase in the presence of 1-hydroxybenzotriazole as a mediator. IL pretreatment did not significantly change the chemical composition of the wood, but did alter its structure and rendered its surface more accessible to the enzyme. Treated and untreated samples were characterized by SEM, FTIR, XRD, TGA, and chemical methods. The cellulose content of the produced fibers was approximately 73.1% and the lignin content was 9.8%, much lower than the lignin content of 29.3% of the untreated wood. The cellulose fibers exhibited higher cellulose crystallinity and better thermal stability compared to untreated wood materials.
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Affiliation(s)
- Muhammad Moniruzzaman
- Department of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Kita-Ku, Okayama 700-8530, Japan.
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203
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Khimji I, Doan K, Bruggeman K, Huang PJJ, Vajha P, Liu J. Extraction of DNA staining dyes from DNA using hydrophobic ionic liquids. Chem Commun (Camb) 2013; 49:4537-9. [DOI: 10.1039/c3cc41364k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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204
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Pandey S, Baker GA, Sze L, Pandey S, Kamath G, Zhao H, Baker SN. Ionic liquids containing fluorinated β-diketonate anions: synthesis, characterization and potential applications. NEW J CHEM 2013. [DOI: 10.1039/c3nj40855h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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205
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Roy I, Mukherjee J, Gupta MN. High activity preparations of lipases and proteases for catalysis in low water containing organic solvents and ionic liquids. Methods Mol Biol 2013; 1051:275-284. [PMID: 23934811 DOI: 10.1007/978-1-62703-550-7_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Simple precipitation of enzymes has shown impressive catalytic efficiencies in organic solvents. In asmuch as these can be recovered after the reaction, these can be viewed as immobilized preparations just like more extensively used cross-linked enzyme aggregates (CLEAs). This chapter describes three protocols which use these enzyme precipitated and rinsed with propanol/some other appropriate organic solvent. The first two protocols show their applications in ionic liquids for a transesterification reaction and a kinetic resolution. The third protocol presumably incorporates an "imprinting" effect so that the precipitates are now able to efficiently catalyze transesterification of tributyrin with tertiary alcohols.
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Affiliation(s)
- Ipsita Roy
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Punjab, India
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206
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de Souza RL, de Faria ELP, Figueiredo RT, Freitas LDS, Iglesias M, Mattedi S, Zanin GM, dos Santos OAA, Coutinho JAP, Lima ÁS, Soares CMF. Protic ionic liquid as additive on lipase immobilization using silica sol-gel. Enzyme Microb Technol 2012; 52:141-50. [PMID: 23410924 DOI: 10.1016/j.enzmictec.2012.12.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 12/16/2012] [Accepted: 12/17/2012] [Indexed: 01/09/2023]
Abstract
Ionic liquids (ILs) have evolved as a new type of non-aqueous solvents for biocatalysis, mainly due to their unique and tunable physical properties. A number of recent review papers have described a variety of enzymatic reactions conducted in IL solutions, on the other hand, to improve the enzyme's activity and stability in ILs; major methods being explored include the enzyme immobilization (on solid support, sol-gel, etc.), protic ionic liquids used as an additive process. The immobilization of the lipase from Burkholderia cepacia by the sol-gel technique using protic ionic liquids (PIL) as additives to protect against inactivation of the lipase due to release of alcohol and shrinkage of the gel during the sol-gel process was investigated in this study. The influence of various factors such as the length of the alkyl chain of protic ionic liquids (monoethanolamine-based) and a concentration range between 0.5 and 3.0% (w/v) were evaluated. The resulting hydrophobic matrices and immobilized lipases were characterised with regard to specific surface area, adsorption-desorption isotherms, pore volume (V(p)) and size (d(p)) according to nitrogen adsorption and scanning electron microscopy (SEM), physico-chemical properties (thermogravimetric - TG, differential scanning calorimetry - DSC and Fourier transform infrared spectroscopy - FTIR) and the potential for ethyl ester and emulsifier production. The total activity yields (Y(a)) for matrices of immobilized lipase employing protic ionic liquids as additives always resulted in higher values compared with the sample absent the protic ionic liquids, which represents 35-fold increase in recovery of enzymatic activity using the more hydrophobic protic ionic liquids. Compared with arrays of the immobilized biocatalyst without additive, in general, the immobilized biocatalyst in the presence of protic ionic liquids showed increased values of surface area (143-245 m(2) g(-1)) and pore size (19-38 Å). Immobilization with protic ionic liquids also favoured reduced mass loss according to TG curves (always less than 42.9%) when compared to the immobilized matrix without protic ionic liquids (45.1%), except for the sample containing 3.0% protic ionic liquids (46.5%), verified by thermogravimetric analysis. Ionic liquids containing a more hydrophobic alkyl group in the cationic moiety were beneficial for recovery of the activity of the immobilized lipase. The physico-chemical characterization confirmed the presence of the enzyme and its immobilized derivatives obtained in this study by identifying the presence of amino groups, and profiling enthalpy changes of mass loss.
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Affiliation(s)
- Ranyere Lucena de Souza
- UNIT, Universidade Tiradentes, Instituto de Tecnologia e Pesquisa-ITP, Av. Murilo Dantas, 300, Prédio do ITP, Farolândia, Aracaju, SE, Brazil
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207
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Wang X, Li Q, Chen X, Li Z. Effects of structure dissymmetry on aggregation behaviors of quaternary ammonium Gemini surfactants in a protic ionic liquid EAN. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:16547-16554. [PMID: 23140416 DOI: 10.1021/la304004u] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The aggregation behaviors of a series of dissymmetric cationic Gemini surfactants, [C(m)H(2m+1)(CH(3))(2)N(CH(2))(2)N(CH(3))(2)C(n)H(2n+1)]Br(2), designated as m-2-n (with a fixed m + n = 24, m = 16, 14, 12) have been investigated in a protic ionic liquid, ethylammonium nitrate (EAN). Surface tension, polarized optical microscopy (POM), small-angle X-ray scattering (SAXS), and rheological measurements are adopted to investigate the micellization and lyotropic liquid crystal (LLC) formation. The obtained results indicate that the structure dissymmetry plays an important role in aggregation process of m-2-n. With increasing degree of dissymmetry, the critical micellization concentration, the maximum reduction of solvent surface tension, and the minimum area occupied per surfactant molecule at the air/EAN interface all become smaller. The thermostability of formed LLCs is therefore improved because of the more compact molecules. These characteristics can be explained by the enhancement of solvophobic effect due to the increased structure dissymmetry of Gemini surfactants.
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Affiliation(s)
- Xudong Wang
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China
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208
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209
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Lai JQ, Hu ZL, Sheldon RA, Yang Z. Catalytic performance of cross-linked enzyme aggregates of Penicillium expansum lipase and their use as catalyst for biodiesel production. Process Biochem 2012. [DOI: 10.1016/j.procbio.2012.07.024] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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210
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Immobilization of Burkholderia cepacia lipase on functionalized ionic liquids modified mesoporous silica SBA-15. Process Biochem 2012. [DOI: 10.1016/j.procbio.2012.09.007] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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211
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Electricity generation from carboxymethyl cellulose biomass: A new application of enzymatic biofuel cells. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2011.11.122] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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212
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Scharf NT, Stark A, Hoffmann MM. Ion Pairing and Dynamics of the Ionic Liquid 1-Hexyl-3-methylimidazolium Bis(irifluoromethylsulfonyl)amide ([C6mim][NTf2]) in the Low Dielectric Solvent Chloroform. J Phys Chem B 2012; 116:11488-97. [DOI: 10.1021/jp3047592] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nathan T. Scharf
- Department of Chemistry, The
College at Brockport, State University of New York, Brockport, New York 14420, United States
| | - Annegret Stark
- Institute for Industrial Chemistry, University of Leipzig, Linnéstrasse 3-4, 04107
Leipzig, Germany
| | - Markus M. Hoffmann
- Department of Chemistry, The
College at Brockport, State University of New York, Brockport, New York 14420, United States
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213
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Zhang BB, Cheng J, Lou WY, Wang P, Zong MH. Efficient anti-Prelog enantioselective reduction of acetyltrimethylsilane to (R)-1-trimethylsilylethanol by immobilized Candida parapsilosis CCTCC M203011 cells in ionic liquid-based biphasic systems. Microb Cell Fact 2012; 11:108. [PMID: 22897972 PMCID: PMC3527300 DOI: 10.1186/1475-2859-11-108] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Accepted: 06/27/2012] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND Biocatalytic asymmetric reductions with whole cells can offer high enantioselectivity, environmentally benign processes and energy-effective operations and thus are of great interest. The application of whole cell-mediated bioreduction is often restricted if substrate and product have low water solubility and/or high toxicity to the biocatalyst. Many studies have shown that a biphasic system is often useful in this instance. Hence, we developed efficient biphasic reaction systems with biocompatible water-immiscible ionic liquids (ILs), to improve the biocatalytic anti-Prelog enantioselective reduction of acetyltrimethylsilane (ATMS) to (R)-1-trimethylsilylethanol {(R)-1-TMSE}, which is key synthon for a large number of silicon-containing drugs, using immobilized Candida parapsilosis CCTCC M203011 cells as the biocatalyst. RESULTS It was found that the substrate ATMS and the product 1-TMSE exerted pronounced toxicity to immobilized Candida parapsilosis CCTCC M203011 cells. The biocompatible water-immiscible ILs can be applied as a substrate reservoir and in situ extractant for the product, thus greatly enhancing the efficiency of the biocatalytic process and the operational stability of the cells as compared to the IL-free aqueous system. Various ILs exerted significant but different effects on the bioreduction and the performances of biocatalysts were closely related to the kinds and combination of cation and anion of ILs. Among all the water-immiscible ILs investigated, the best results were observed in 1-butyl-3-methylimidazolium hexafluorophosphate (C(4)mim·PF(6))/buffer biphasic system. Furthermore, it was shown that the optimum substrate concentration, volume ratio of buffer to IL, buffer pH, reaction temperature and shaking rate for the bioreduction were 120 mM, 8/1 (v/v), 6.0, 30°C and 180 r/min, respectively. Under these optimized conditions, the initial reaction rate, the maximum yield and the product e.e. were 8.1 μmol/min g(cwm), 98.6% and >99%, respectively. The efficient whole-cell biocatalytic process was shown to be feasible on a 450-mL scale. Moreover, the immobilized cells remained around 87% of their initial activity even after being used repeatedly for 8 batches in the C(4)mim·PF(6)/buffer biphasic system, exhibiting excellent operational stability. CONCLUSIONS For the first time, we have successfully utilized immobilized Candida parapsilosis CCTCC M203011 cells, for efficiently catalyzing anti-Prelog enantioselective reduction of ATMS to enantiopure (R)-1-TMSE in the C(4)mim·PF(6)/buffer biphasic system. The substantially improved biocatalytic process appears to be effective and competitive on a preparative scale.
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Affiliation(s)
- Bo-Bo Zhang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Jing Cheng
- Laboratory of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, 510640, China
| | - Wen-Yong Lou
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China
- Laboratory of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, 510640, China
| | - Pan Wang
- Laboratory of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, 510640, China
| | - Min-Hua Zong
- Laboratory of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, 510640, China
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214
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Castillo MR, Fraile JM, Mayoral JA. Structure and dynamics of 1-butyl-3-methylimidazolium hexafluorophosphate phases on silica and laponite clay: from liquid to solid behavior. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:11364-75. [PMID: 22775393 DOI: 10.1021/la300976p] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Solid-state NMR experiments show that the behavior of supported 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid phases depends on the type of support and the phase thickness. A mobile nearly liquid phase is obtained on silica, on the basis of the line widths of the bands in (1)H, (31)P, and (13)C spectra. However, the mobility is somehow restricted, as shown by the possibility of using the cross-polarization technique, although with slow dynamics. On laponite clay, a layered material with a negatively charged surface, a truly solid phase is obtained at low coverage, whereas the increase in ionic liquid loading leads to a second liquid phase, as shown by the presence of two contributions with very different line widths. These two phases seem to coexist without exchange in the NMR time frame. Heteronuclear correlation experiments evidence different relative dispositions of the imidazolium-surface-PF(6) system, with only aromatic protons involved in all the interactions on silica but participation of the benzylic groups (N-CH(3) and/or N-CH(2)) in the case of laponite clay.
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Affiliation(s)
- M Rosa Castillo
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain
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215
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Valderrama JO, Rojas RE. Data selection and estimation of the normal melting temperature of ionic liquids using a method based on homologous cations. CR CHIM 2012. [DOI: 10.1016/j.crci.2012.04.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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216
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Nyanhongo GS, Nugroho Prasetyo E, Herrero Acero E, Guebitz GM. Engineering Strategies for Successful Development of Functional Polymers Using Oxidative Enzymes. Chem Eng Technol 2012. [DOI: 10.1002/ceat.201100590] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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217
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Ebrahimi M, Hosseinkhani S, Heydari A, Khavari-Nejad RA, Akbari J. Improvement of Thermostability and Activity of Firefly Luciferase Through [TMG][Ac] Ionic Liquid Mediator. Appl Biochem Biotechnol 2012; 168:604-15. [DOI: 10.1007/s12010-012-9803-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Accepted: 06/06/2012] [Indexed: 10/28/2022]
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218
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Phan NTS, Le KKA, Nguyen TV, Le NTH. Chitosan as a renewable heterogeneous catalyst for the knoevenagel reaction in ionic liquid as green solvent. ISRN ORGANIC CHEMISTRY 2012; 2012:928484. [PMID: 24052856 PMCID: PMC3765753 DOI: 10.5402/2012/928484] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Accepted: 06/14/2012] [Indexed: 11/23/2022]
Abstract
The combination of chitosan as a renewable heterogeneous catalyst and ionic liquid as a "green" solvent was employed for the Knoevenagel reaction. The chitosan catalyst was characterized by various techniques, including X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), and elemental analysis. Excellent conversions were achieved under mild conditions without the need for an inert atmosphere. There was no contribution from leached active species, and conversion was only being possible in the presence of the solid catalyst. The chitosan catalyst as well as the ionic liquid solvent could be recovered in essentially pure form after being used in the reaction, and each of them could be reused several times without a significant degradation in efficiency.
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Affiliation(s)
- Nam T S Phan
- Department of Chemical Engineering, Ho Chi Minh City University of Technology, VNU-HCM, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City 70350, Vietnam
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219
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Tavares APM, Pereira JAN, Xavier AMRB. Effect of ionic liquids activation on laccase fromTrametes versicolor: Enzymatic stability and activity. Eng Life Sci 2012. [DOI: 10.1002/elsc.201100203] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Ana P. M. Tavares
- LSRE-Laboratory of Separation and Reaction Engineering; Associate Laboratory LSRE/LCM, Department of Chemical Engineering; Faculty of Engineering; University of Porto; Porto; Portugal
| | - Juliana A. N. Pereira
- Centre for Research in Ceramics and Composite Materials (CICECO); Department of Chemistry; University of Aveiro; Aveiro; Portugal
| | - Ana M. R. B. Xavier
- Centre for Research in Ceramics and Composite Materials (CICECO); Department of Chemistry; University of Aveiro; Aveiro; Portugal
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220
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Yu D, Wang Y, Wang C, Ma D, Fang X. Combination use of microwave irradiation and ionic liquid in enzymatic isomerization of xylose to xylulose. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcatb.2012.04.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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221
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β-Galactosidase activity in mixed micelles of imidazolium ionic liquids and sodium dodecylsulfate: A sequential injection kinetic study. Talanta 2012; 96:26-33. [DOI: 10.1016/j.talanta.2012.02.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 01/17/2012] [Accepted: 02/08/2012] [Indexed: 11/23/2022]
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222
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Base-free conjugate addition of aliphatic nitro compounds to enones in BmimNTf2: a recyclable synthesis of γ-nitro ketones. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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223
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224
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Mohidem NA, Mat HB. The catalytic activity enhancement and biodegradation potential of free laccase and novel sol-gel laccase in non-conventional solvents. BIORESOURCE TECHNOLOGY 2012; 114:472-477. [PMID: 22464060 DOI: 10.1016/j.biortech.2012.02.138] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Revised: 02/29/2012] [Accepted: 02/29/2012] [Indexed: 05/31/2023]
Abstract
The catalytic activity of free laccase and a novel sol-gel laccase (SOLAC) in ionic liquids and organic solvents was demonstrated by using 2,6-dimethoxyphenol (2,6-DMP) as a substrate. The enhancement of the catalytic activity of the SOLAC was observed and compared to the free laccase in both media. The oxidative biodegradation of o-chlorophenol as a model of phenolic environmental pollutants in organic media shows that the degradation was observed only when using water pre-saturated organic solvents or reverse micelle system. The SOLAC gave higher biodegradation rate in either aqueous or organic solvents, in which the optimum temperature was observed at 40 °C for the reverse micelle system as a reaction medium. All results demonstrated the potential use of the SOLAC for biodegradation of phenolic environmental pollutants in non-conventional media.
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Affiliation(s)
- Nur Atikah Mohidem
- Advanced Materials and Process Engineering (AMPEN) Laboratory, Faculty of Chemical Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia
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225
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Wang Y, Pan Y, Zhang Z, Sun R, Fang X, Yu D. Combination use of ultrasound irradiation and ionic liquid in enzymatic isomerization of glucose to fructose. Process Biochem 2012. [DOI: 10.1016/j.procbio.2012.03.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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226
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Pinto PCAG, Costa SPF, Lima JLFC, Saraiva MLMFS. Automated high-throughput Vibrio fischeri assay for (eco)toxicity screening: application to ionic liquids. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2012; 80:97-102. [PMID: 22417674 DOI: 10.1016/j.ecoenv.2012.02.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2012] [Revised: 02/14/2012] [Accepted: 02/15/2012] [Indexed: 05/31/2023]
Abstract
An automated high-throughput Vibrio fischeri assay was developed and further applied to the evaluation of ionic liquids (ILs) (eco)toxicity. The assay was based on the reduction of bacterial bioluminescence in the presence of test compounds and the results were presented as EC(50). The assays were performed with eight commercially available ILs with distinct cationic head groups, alkyl side chains and anions. EC(50) values between 6.5 and 691.9 mmol L(-1) were obtained for the tested ILs, being hmim [Cl] the most toxic and bmim [Cl] the less toxic ones, confirming the influence of the different structural elements. Moreover, all the tested ILs exhibited a (eco)toxicity lower than Cu(II), used as a positive control during the optimization and analysis steps. The automated assay assured the precise control of the contact time between V. fischeri and test compound by means of a simple protocol that guaranteed adequate aspiration and handling of the solutions as well as the precise implementation of a computer controlled stop period. Furthermore, a significant reduction of the assay costs was achieved through automation mainly by a drastic reduction of the volume of bacterial suspension and test compound. The methodology was validated by comparison with a microplate assay; it was stated that the results, obtained after a 3min contact time, changed proportionally relatively to Cu(II) in both assays. This confirmed the applicability of the methodology as an (eco)toxicity screening assay, with reduction of time and increase of robustness and repeatability (n=10; rsd<1.1%). It is expected that due to its simplicity and reduced cost the developed assay can be integrated in the early stage of development of new compounds as a rapid screening test.
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Affiliation(s)
- Paula C A G Pinto
- REQUIMTE, Departamento de Química, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal.
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227
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Zhang BB, Lou WY, Chen WJ, Zong MH. Efficient asymmetric reduction of 4-(trimethylsilyl)-3-butyn-2-one by Candida parapsilosis cells in an ionic liquid-containing system. PLoS One 2012; 7:e37641. [PMID: 22662183 PMCID: PMC3360755 DOI: 10.1371/journal.pone.0037641] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Accepted: 04/26/2012] [Indexed: 12/01/2022] Open
Abstract
Hydrophilic ionic liquids (ILs) were employed as green solvents to construct an IL-containing co-solvent system for improving the asymmetric reduction of 4-(trimethylsilyl)-3-butyn-2-one by immobilized Candida parapsilosis cells. Among 14 hydrophilic ILs examined, 1-(2'-hydroxyl)ethyl-3-methylimidazolium nitrate (C(2)OHMIM·NO(3)) was considered as the most suitable IL for the bioreduction with the fastest initial reaction rate, the highest yield and the highest product e.e., which may be due to the good biocompatibility with the cells. For a better understanding of the bioreduction performed in the C(2)OHMIM·NO(3)-containing co-solvent system, the effects of several crucial variables were systematically investigated. The optimal C(2)OHMIM·NO(3) content, substrate concentration, buffer pH, co-substrate concentration and temperature were 10% (v/v), 3.0 mmol/L, 5.0, 98.1 mmol/L and 30°C, respectively. Under the optimal conditions, the initial reaction rate, the maximum yield and the product e.e. were 17.3 µmol/h g(cell), 95.2% and >99.9%, respectively, which are much better than the corresponding results previously reported. Moreover, the immobilized cells remained more than 83% of their initial activity even after being used repeatedly for 10 batches in the C(2)OHMIM·NO(3)-containing system, exhibiting excellent operational stability.
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Affiliation(s)
- Bo-Bo Zhang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, People's Republic of China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, People's Republic of China
| | - Wen-Yong Lou
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, People's Republic of China
| | - Wen-Jing Chen
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, People's Republic of China
| | - Min-Hua Zong
- Laboratory of Applied Biocatalysis, South China University of Technology, Guangzhou, People's Republic of China
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228
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Tang S, Baker GA, Zhao H. Ether- and alcohol-functionalized task-specific ionic liquids: attractive properties and applications. Chem Soc Rev 2012; 41:4030-66. [PMID: 22456483 PMCID: PMC3341508 DOI: 10.1039/c2cs15362a] [Citation(s) in RCA: 345] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In recent years, the designer nature of ionic liquids (ILs) has driven their exploration and exploitation in countless fields among the physical and chemical sciences. A fair measure of the tremendous attention placed on these fluids has been attributed to their inherent designer nature. And yet, there are relatively few examples of reviews that emphasize this vital aspect in an exhaustive or meaningful way. In this critical review, we systematically survey the physicochemical properties of the collective library of ether- and alcohol-functionalized ILs, highlighting the impact of ionic structure on features such as viscosity, phase behavior/transitions, density, thermostability, electrochemical properties, and polarity (e.g. hydrophilicity, hydrogen bonding capability). In the latter portions of this review, we emphasize the attractive applications of these functionalized ILs across a range of disciplines, including their use as electrolytes or functional fluids for electrochemistry, extractions, biphasic systems, gas separations, carbon capture, carbohydrate dissolution (particularly, the (ligno)celluloses), polymer chemistry, antimicrobial and antielectrostatic agents, organic synthesis, biomolecular stabilization and activation, and nanoscience. Finally, this review discusses anion-functionalized ILs, including sulfur- and oxygen-functionalized analogs, as well as choline-based deep eutectic solvents (DESs), an emerging class of fluids which can be sensibly categorized as semi-molecular cousins to the IL. Finally, the toxicity and biodegradability of ether- and alcohol-functionalized ILs are discussed and cautiously evaluated in light of recent reports. By carefully summarizing literature examples on the properties and applications of oxy-functional designer ILs up till now, it is our intent that this review offers a barometer for gauging future advances in the field as well as a trigger to spur further contemplation of these seemingly inexhaustible and--relative to their potential--virtually untouched fluids. It is abundantly clear that these remarkable fluidic materials are here to stay, just as certain design rules are slowly beginning to emerge. However, in fairness, serendipity also still plays an undeniable role, highlighting the need for both expanded in silico studies and a beacon to attract bright, young researchers to the field (406 references).
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Affiliation(s)
- Shaokun Tang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China
| | - Gary A. Baker
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO 65211, USA
| | - Hua Zhao
- Chemistry Program, Savannah State University, Savannah, GA 31404, USA
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229
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Dong FX, Zhang L, Tong XZ, Chen HB, Wang XL, Wang YZ. Ionic liquid coated lipase: Green synthesis of high molecular weight poly(1,4-dioxan-2-one). ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcatb.2012.01.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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230
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Xue L, Li Y, Zou F, Lu L, Zhao Y, Huang X, Qu Y. The catalytic efficiency of lipase in a novel water-in-[Bmim][PF6] microemulsion stabilized by both AOT and Triton X-100. Colloids Surf B Biointerfaces 2012; 92:360-6. [DOI: 10.1016/j.colsurfb.2011.12.019] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Revised: 11/19/2011] [Accepted: 12/14/2011] [Indexed: 10/14/2022]
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231
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Abe Y, Yagi Y, Hayase S, Kawatsura M, Itoh T. Ionic Liquid Engineering for Lipase-Mediated Optical Resolution of Secondary Alcohols: Design of Ionic Liquids Applicable to Ionic Liquid Coated-Lipase Catalyzed Reaction. Ind Eng Chem Res 2012. [DOI: 10.1021/ie202740u] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshikazu Abe
- Department of Chemistry and Biotechnology,
Graduate
School of Engineering, Tottori University, Japan 680-8552
| | - Yusuke Yagi
- Department of Chemistry and Biotechnology,
Graduate
School of Engineering, Tottori University, Japan 680-8552
| | - Shuichi Hayase
- Department of Chemistry and Biotechnology,
Graduate
School of Engineering, Tottori University, Japan 680-8552
| | - Motoi Kawatsura
- Department of Chemistry and Biotechnology,
Graduate
School of Engineering, Tottori University, Japan 680-8552
| | - Toshiyuki Itoh
- Department of Chemistry and Biotechnology,
Graduate
School of Engineering, Tottori University, Japan 680-8552
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232
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233
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Aparicio S, Atilhan M. Mixed Ionic Liquids: The Case of Pyridinium-Based Fluids. J Phys Chem B 2012; 116:2526-37. [DOI: 10.1021/jp212258b] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Mert Atilhan
- Chemical Engineering Department, Qatar University, Doha, Qatar
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234
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Novel nanostructure amino acid-based poly(amide–imide)s enclosing benzimidazole pendant group in green medium: fabrication and characterization. Amino Acids 2012; 43:1605-13. [DOI: 10.1007/s00726-012-1236-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Accepted: 01/29/2012] [Indexed: 11/26/2022]
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235
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Wang X, Chen X, Zhao Y, Yue X, Li Q, Li Z. Nonaqueous lyotropic liquid-crystalline phases formed by gemini surfactants in a protic ionic liquid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2476-84. [PMID: 22185632 DOI: 10.1021/la204489v] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The aggregation behaviors of three Gemini surfactants [(C(s)H(2s)-α,ω-(Me(2)N(+)C(m)H(2m+1)Br(-))(2), s = 2, m = 10, 12, 14] in a protic ionic liquid, ethylammonium nitrate (EAN), have been investigated. The polarized optical microscopy and small-angle X-ray scattering (SAXS) measurements are used to explore the lyotropic liquid crystal (LLC) formation. Compared to the LLCs formed in aqueous environment, the normal hexagonal and lamellar phases disappear. However, with increasing the surfactant concentration, a new reverse hexagonal phase (H(II)) can be mapped over a large temperature range except for other ordered aggregates including the isotropic solution phase and a two-phase coexistence region. The structural parameters of the H(II) are calculated from the corresponding SAXS patterns, showing the influence of surfactant amount, alkyl chain length, and temperature. Meanwhile, the rheological profiles indicate a typical Maxwell behavior of the LLC phases formed in EAN.
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Affiliation(s)
- Xudong Wang
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China
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236
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Seoane RG, Corderí S, Gómez E, Calvar N, González EJ, Macedo EA, Domínguez Á. Temperature Dependence and Structural Influence on the Thermophysical Properties of Eleven Commercial Ionic Liquids. Ind Eng Chem Res 2012. [DOI: 10.1021/ie2029255] [Citation(s) in RCA: 147] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Raquel G. Seoane
- Advanced Separation Processes
Group, Department of Chemical Engineering, University of Vigo, Lagoas-Marcosende Campus, 36310 Vigo, Spain
| | - Sandra Corderí
- Advanced Separation Processes
Group, Department of Chemical Engineering, University of Vigo, Lagoas-Marcosende Campus, 36310 Vigo, Spain
| | - Elena Gómez
- Advanced Separation Processes
Group, Department of Chemical Engineering, University of Vigo, Lagoas-Marcosende Campus, 36310 Vigo, Spain
| | - Noelia Calvar
- LSRE-Laboratory of Separation
and Reaction Engineering-Associated Laboratory LSRE/LCM, Faculdade
de Engenharia, University of Porto, Rua
Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Emilio J. González
- LSRE-Laboratory of Separation
and Reaction Engineering-Associated Laboratory LSRE/LCM, Faculdade
de Engenharia, University of Porto, Rua
Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Eugenia A. Macedo
- LSRE-Laboratory of Separation
and Reaction Engineering-Associated Laboratory LSRE/LCM, Faculdade
de Engenharia, University of Porto, Rua
Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Ángeles Domínguez
- Advanced Separation Processes
Group, Department of Chemical Engineering, University of Vigo, Lagoas-Marcosende Campus, 36310 Vigo, Spain
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237
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Brondani D, Scheeren CW, Dupont J, Vieira IC. Halloysite clay nanotubes and platinum nanoparticles dispersed in ionic liquid applied in the development of a catecholamine biosensor. Analyst 2012; 137:3732-9. [DOI: 10.1039/c2an35313j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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238
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Menhaj AB, Smith BD, Liu J. Exploring the thermal stability of DNA-linked gold nanoparticles in ionic liquids and molecular solvents. Chem Sci 2012. [DOI: 10.1039/c2sc20565c] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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239
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Mangialardo S, Gontrani L, Leonelli F, Caminiti R, Postorino P. Role of ionic liquids in protein refolding: native/fibrillar versus treated lysozyme. RSC Adv 2012. [DOI: 10.1039/c2ra21593d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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240
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Ionic liquid assisted enzymatic delignification of wood biomass: A new ‘green’ and efficient approach for isolating of cellulose fibers. Biochem Eng J 2012. [DOI: 10.1016/j.bej.2011.11.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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241
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Labbé N, Kline LM, Moens L, Kim K, Kim PC, Hayes DG. Activation of lignocellulosic biomass by ionic liquid for biorefinery fractionation. BIORESOURCE TECHNOLOGY 2012; 104:701-7. [PMID: 22079688 DOI: 10.1016/j.biortech.2011.10.062] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Revised: 10/14/2011] [Accepted: 10/18/2011] [Indexed: 05/05/2023]
Abstract
Fractionation of lignocellulosic biomass is an attractive solution to develop an economically viable biorefinery by providing a saccharide fraction to produce fuels and a lignin stream that can be converted into high value products such as carbon fibers. In this study, the analysis of ionic liquid-activated biomass demonstrates that in addition of decreasing crystallinity, the selected ILs (1-butyl-3-methylimidazolium acetate, 1-butyl-3-methylimidazolium chloride and 1-ethyl-3-methylimidazolium acetate) deacetylate Yellow poplar under mild conditions (dissolution at 60-80 °C), and lower the degradation temperature of each biomass polymeric component, thereby reducing the recalcitrance of biomass. Among the three tested ILs, 1-ethyl-3-methylimidazolium acetate performed the best, providing a strong linear relationship between the level of deacetylation and the rate of enzymatic saccharification for Yellow poplar.
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Affiliation(s)
- Nicole Labbé
- Center for Renewable Carbon, University of Tennessee, Knoxville, TN, USA.
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242
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Ebrahimi M, Hosseinkhani S, Heydari A, Khavari-Nejad RA, Akbari J. Controversial effect of two methylguanidine-based ionic liquids on firefly luciferase. Photochem Photobiol Sci 2012; 11:828-34. [DOI: 10.1039/c2pp05389f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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243
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Moniruzzaman M, Ino K, Kamiya N, Goto M. Lipase incorporated ionic liquid polymers as active, stable and reusable biocatalysts. Org Biomol Chem 2012; 10:7707-13. [DOI: 10.1039/c2ob25529d] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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244
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Weibels S, Syguda A, Herrmann C, Weingärtner H. Steering the enzymatic activity of proteins by ionic liquids. A case study of the enzyme kinetics of yeast alcohol dehydrogenase. Phys Chem Chem Phys 2012; 14:4635-9. [DOI: 10.1039/c2cp24041f] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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245
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Yang Z, Huang ZL. Enzymatic synthesis of sugar fatty acid esters in ionic liquids. Catal Sci Technol 2012. [DOI: 10.1039/c2cy20109g] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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246
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Clouthier CM, Pelletier JN. Expanding the organic toolbox: a guide to integrating biocatalysis in synthesis. Chem Soc Rev 2012; 41:1585-605. [DOI: 10.1039/c2cs15286j] [Citation(s) in RCA: 251] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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247
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Identification of suitable ionic liquids for application in the enzymatic hydrolysis of rutin by an automated screening. Appl Microbiol Biotechnol 2011; 93:2301-8. [PMID: 22159609 DOI: 10.1007/s00253-011-3749-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 11/02/2011] [Accepted: 11/17/2011] [Indexed: 10/14/2022]
Abstract
An automated method in milliliter scale was developed for the screening of process parameters concerning the hydrolysis of the flavonoid rutin catalyzed by the rhamnosidase activity of naringinase from Penicillium decumbens. Besides the effect of additives such as ionic liquids and low molecular salts, the productivity in a multiple phase system as well as the recyclability of the enzyme in repetitive batches were studied. The hydrophobic ionic liquid (IL) trihexyl(tetradecyl)phosphonium bis(trifluormethylsulfonyl)imide [P(h(3))t][Tf(2)N] was identified to combine the most favorable characteristics out of 23 investigated ILs with regard to enzyme compatibility, substrate solubility and enzyme partition coefficient. Also, for the corresponding cations 1-ethyl-3-methylimidazolium [EMIM], 1-butyl-3-methylimidazolium [BMIM], 1-butyl-1-methylpyrrolidinium [BMPL] and 1-octyl-3-methylimidazolium [OMIM], the entity with the [Tf(2)N] anion was best tolerated by the naringinase. With increasing IL content, higher space time yields with up to 1.5 g/(L h) for 80% (v/v) [P(h(3))t][Tf(2)N] were achieved. Enhanced specific enzyme activity was observed in the presence of Ca(2+) ions. By addition of [P(h(3))t][Tf(2)N] and calcium chloride, the reactive aqueous phase was successfully used in three repetitive batches with full conversion.
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248
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Bekhouche M, Blum LJ, Doumèche B. Contribution of Dynamic and Static Quenchers for the Study of Protein Conformation in Ionic Liquids by Steady-State Fluorescence Spectroscopy. J Phys Chem B 2011; 116:413-23. [DOI: 10.1021/jp205094c] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mourad Bekhouche
- ICBMS, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, CNRS UMR 5246, Université Lyon 1, 43 boulevard du 11 novembre 1918, Villeurbanne F-69622, France
| | - Loïc J. Blum
- ICBMS, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, CNRS UMR 5246, Université Lyon 1, 43 boulevard du 11 novembre 1918, Villeurbanne F-69622, France
| | - Bastien Doumèche
- ICBMS, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, CNRS UMR 5246, Université Lyon 1, 43 boulevard du 11 novembre 1918, Villeurbanne F-69622, France
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249
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Sun X, Luo H, Dai S. Ionic liquids-based extraction: a promising strategy for the advanced nuclear fuel cycle. Chem Rev 2011; 112:2100-28. [PMID: 22136437 DOI: 10.1021/cr200193x] [Citation(s) in RCA: 551] [Impact Index Per Article: 42.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiaoqi Sun
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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250
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Rahimi P, Ghourchian H, Sajjadi S. Effect of hydrophilicity of room temperature ionic liquids on the electrochemical and electrocatalytic behaviour of choline oxidase. Analyst 2011; 137:471-5. [PMID: 22140677 DOI: 10.1039/c1an15732a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present report, six different nano-composites contaning the same amine functionalized multi-walled carbon nanotubes (NH(2)-MWCNTs) but different room temperature ionic liquids (RTILs) were prepared. Then, the efficiency of these nano-composites as supporting materials for studying the electrochemistry and electrocatalysis of choline oxidase (ChOx) as a model enzyme were compared. The corresponding cyclic voltammetric and amperometric data showed that the electrocatalytic activity and the electroanalytical performance of immobilized ChOx depends on the degree of hydrophilicity of RTILs used in the applied nano-composite. The higher stability (180 days), higher enzyme loading (6.56 mol cm(-2)), lower detection limit (3.85 μM) and wider linear range (0.005-0.8 mM) was obtained for the most hydrophilic RTIL (1-allyl-3-methylimidazolium bromide).
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Affiliation(s)
- Parvaneh Rahimi
- Laboratory of Microanalysis, Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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