151
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Uyar T, Havelund R, Hacaloglu J, Besenbacher F, Kingshott P. Functional electrospun polystyrene nanofibers incorporating α-, β-, and γ-cyclodextrins: comparison of molecular filter performance. ACS NANO 2010; 4:5121-5130. [PMID: 20718443 DOI: 10.1021/nn100954z] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Electrospinning has been used to successfully create polystyrene (PS) nanofibers containing either of three different types of cyclodextrin (CD); α-CD, β-CD, and γ-CD. These three CDs are chosen because they have different sized cavities that potentially allow for selective inclusion complex (IC) formation with molecules of different size or differences in affinity of IC formation with one type of molecule. The CD containing electrospun PS nanofibers (PS/CD) were initially characterized by scanning electron microscopy (SEM) to determine the uniformity of the fibers and their fiber diameter distributions. X-ray photoelectron spectroscopy (XPS) was used to quantitatively determine the concentration of each CD on the different fiber surfaces. Static time-of-flight secondary ion mass spectrometry (static-ToF-SIMS) showed the presence of each type of CD on the PS nanofibers by the detection of both the CD sodium adduct molecular ions (M + Na+) and lower molecular weight oxygen containing fragment ions. The comparative efficiency of the PS/CD nanofibers/nanoweb for removing phenolphthalein, a model organic compound, from solution was determined by UV-vis spectrometry, and the kinetics of phenolphthalein capture was shown to follow the trend PS/α-CD > PS/β-CD > PS/γ-CD. Direct pyrolysis mass spectrometry (DP-MS) was also performed to ascertain the relative binding strengths of the phenolphthalein for the CD cavities, and the results showed the trend in the interaction strength was β-CD > γ-CD > α-CD. Our results demonstrate that nanofibers produced by electrospinning that incorporate cyclodextrins with different sized cavities can indeed filter organic molecules and can potentially be used for filtration, purification, and/or separation processes.
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Affiliation(s)
- Tamer Uyar
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, DK-8000 Aarhus C, Denmark.
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152
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Chin YP, Mohamad S, Abas MRB. Removal of parabens from aqueous solution using β-cyclodextrin cross-linked polymer. Int J Mol Sci 2010; 11:3459-71. [PMID: 20957106 PMCID: PMC2956106 DOI: 10.3390/ijms11092459] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Revised: 08/24/2010] [Accepted: 08/24/2010] [Indexed: 11/16/2022] Open
Abstract
The removal of four parabens, methyl-, ethyl-, propyl-, and benzyl-paraben, by β-cyclodextrin (β-CD) polymer from aqueous solution was studied. Different β-CD polymers were prepared by using two cross-linkers, i.e., hexamethylene diisocyanate (HMDI) and toluene-2,6-diisocyanate (TDI), with various molar ratios of cross-linker. β-CD-HMDI polymer with molar ratio of 1:7 and β-CD-TDI polymer with ratio 1:4 gave the highest adsorption of parabens among the β-CD-HMDI and β-CD-TDI series, and were subsequently used for further studies. The adsorption capacity of β-CD-HMDI is 0.0305, 0.0376, 0.1854 and 0.3026 mmol/g for methyl-, ethyl-, propyl-, and benzyl-paraben, respectively. β-CD-TDI have higher adsorption capacities compared with β-CD-HMDI, the adsorption capacity are 0.1019, 0.1286, 0.2551, and 0.3699 mmol/g methyl-, ethyl-, propyl-, and benzyl-paraben respectively. The parameters studied were adsorption capacity, water retention, and reusability. Role of both cross-linker in adsorption, hydrophobicity of polymers, and adsorption capacity of different parabens were compared and discussed. All experiments were conducted in batch adsorption technique. These polymers were applied to real samples and showed positive results.
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Affiliation(s)
- Yuk Ping Chin
- Environmental Research Group, Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (Y.P.C.); (M.R.B.A.)
| | - Sharifah Mohamad
- Environmental Research Group, Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (Y.P.C.); (M.R.B.A.)
| | - Mhd Radzi Bin Abas
- Environmental Research Group, Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; E-Mails: (Y.P.C.); (M.R.B.A.)
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153
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Mostafa KM, Samarkandy AR, El-Sanabary AA. Removal of basic dyes from aqueous medium using novel poly(MAA)-cross linked pregelled starch graft copolymer. J Appl Polym Sci 2010. [DOI: 10.1002/app.32666] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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154
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Interactions of terbinafine with β-cyclodextrin polymers: sorption and release studies. J INCL PHENOM MACRO 2010. [DOI: 10.1007/s10847-010-9804-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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155
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Sun ZY, Shen MX, Cao GP, Deng J, Liu Y, Liu T, Zhao L, Yuan WK. Preparation of bimodal porous copolymer containing β-cyclodextrin and its inclusion adsorption behavior. J Appl Polym Sci 2010. [DOI: 10.1002/app.32515] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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156
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157
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158
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Tran NQ, Joung YK, Lih E, Park KM, Park KD. Supramolecular Hydrogels Exhibiting Fast In Situ Gel Forming and Adjustable Degradation Properties. Biomacromolecules 2010; 11:617-25. [DOI: 10.1021/bm100047y] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ngoc Quyen Tran
- Department of Molecular Science and Technology, Ajou University, 5 Wonchon, Yeoungtong, Suwon 443-749, Republic of Korea
| | - Yoon Ki Joung
- Department of Molecular Science and Technology, Ajou University, 5 Wonchon, Yeoungtong, Suwon 443-749, Republic of Korea
| | - Eugene Lih
- Department of Molecular Science and Technology, Ajou University, 5 Wonchon, Yeoungtong, Suwon 443-749, Republic of Korea
| | - Kyung Min Park
- Department of Molecular Science and Technology, Ajou University, 5 Wonchon, Yeoungtong, Suwon 443-749, Republic of Korea
| | - Ki Dong Park
- Department of Molecular Science and Technology, Ajou University, 5 Wonchon, Yeoungtong, Suwon 443-749, Republic of Korea
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159
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van de Manakker F, Vermonden T, van Nostrum CF, Hennink WE. Cyclodextrin-based polymeric materials: synthesis, properties, and pharmaceutical/biomedical applications. Biomacromolecules 2010; 10:3157-75. [PMID: 19921854 DOI: 10.1021/bm901065f] [Citation(s) in RCA: 425] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
This review describes the synthesis, properties, and, in particular, biomedical and pharmaceutical applications of an upcoming class of polymeric networks and assemblies based on cyclodextrins (CDs). CDs are cyclic oligosaccharides composed of alpha-1,4-coupled d-glucose units, which contain a hydrophobic internal cavity that can act as a host for various, generally lipophilic, guest molecules. Because of this unique physicochemical property, commonly referred to as inclusion complex formation, CDs have often been used to design polymeric materials, such as hydrogels and nanoparticles. Polymeric systems based on CDs exhibit unique characteristics in terms of mechanical properties, stimuli-responsiveness, and drug release characteristics. In this contribution, first, an outline is given of covalently cross-linked polymeric networks in which CD moieties were structurally incorporated to modulate the network strength as well as the complexation and release of low molecular weight drugs. Second, physically assembled polymeric systems are discussed, of which the formation is accomplished by inclusion complexes between polymer-conjugated CDs and various guest molecule-derivatized polymers. Due to their physical nature, these polymeric systems are sensitive to external stimuli, such as temperature changes, shear forces and the presence of competing CD-binding molecules, which can be exploited to use these systems as injectable, in situ gelling devices. In recent years, many interesting CD-containing polymeric systems have been described in literature. These systems have to be optimized and extensively evaluated in preclinical studies concerning their safety and efficacy, making future clinical applications of these materials in the biomedical and pharmaceutical field feasible.
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Affiliation(s)
- Frank van de Manakker
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, Sorbonnelaan 16, P.O. Box 80082, 3508 TB Utrecht, The Netherlands
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160
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Beta-cyclodextrin-bonded silica assists alkaline phosphatase and carbonic anhydrase refolding in a solid phase assisted refolding approach. Process Biochem 2010. [DOI: 10.1016/j.procbio.2009.09.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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161
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Thatiparti TR, von Recum HA. Cyclodextrin Complexation for Affinity-Based Antibiotic Delivery. Macromol Biosci 2010; 10:82-90. [DOI: 10.1002/mabi.200900204] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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162
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Rozou S, Raftopoulos P, Hatziantoniou S, Antoniadou-Vyza E. New SPE loading material for affinity-based separation of cyclodextrins from drug:CD complexes in order to overcome Beer's law deviations. J Sep Sci 2009; 32:3521-8. [PMID: 19777455 DOI: 10.1002/jssc.200900251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Molecular inclusion of guest molecules within CDs is known to alter guest molecule spectrophotometric absorptivity, making their determination, based on spectrophotometric data, inaccurate. Therefore specific analytical methods capable of quantifying the drugs as free molecules must be developed and validated. SPE was selected to simplify sample and avoid more time-consuming alternatives. A new solid phase was synthesized and characterized by infrared spectrometry, differential scanning calorimetry and elemental analysis. The competitive complexation of adamantane groups immobilized on the silica substrate facilitates drug:CD complex dissociation and elimination of CD from samples. The drug molecules, now free from CD, can be easily analysed by an already available HPLC method. This new SPE loading material was employed in the determination of ketoprofen in its CD complex as a representative example of the utility of this novel material. The calculated analytical errors were reduced from a maximum of 20.79% (without SPE) to a minimum of 3.99%.
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Affiliation(s)
- Stavroula Rozou
- R&D Department, ELPEN Pharmaceutical Company, Attica, Greece
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163
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Erdemir S, Bahadir M, Yilmaz M. Extraction of carcinogenic aromatic amines from aqueous solution using calix[n]arene derivatives as carrier. JOURNAL OF HAZARDOUS MATERIALS 2009; 168:1170-1176. [PMID: 19345489 DOI: 10.1016/j.jhazmat.2009.02.150] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Revised: 02/13/2009] [Accepted: 02/27/2009] [Indexed: 05/27/2023]
Abstract
The extraction abilities of p-tert-butylcalix[n]arenes (n=6, 8) and their carboxylic acid and methyl ester derivatives upon some carcinogenic aromatic amines have been investigated. The separation and quantification of aromatic amines were performed by high-performance liquid chromatography with Ace 5 C(18) column and diode array detection. The optimum pH values for aromatic amines sorption were observed at pH 4.0, 7.0 and 8.5 for all calixarene derivatives. In batch sorption experiments of selected carcinogenic aromatic amines, the experimental results show that octacarboxylic acid derivative of p-tert-butylcalix[8]arene exhibited a better affinity than other compounds towards all aromatic amines species at almost all pHs. The sorption of aromatic amines by carboxylic acid derivatives of p-tert-butylcalix[n]arene indicates that carboxyl groups play the major role for the formation of hydrogen bonds and electrostatic interactions between sorbent and aromatic amine.
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Affiliation(s)
- Serkan Erdemir
- Department of Chemistry, Selcuk University, Konya, Turkey
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164
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Synthesis and properties of water-insoluble β-cyclodextrin polymer crosslinked by citric acid with PEG-400 as modifier. Carbohydr Polym 2009. [DOI: 10.1016/j.carbpol.2009.04.022] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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165
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Mostafa KM, Samarkandy AR, El-Sanabary AA. Preparation of poly (MAA)-crosslinked pregelled starch graft copolymer and its application in waste water treatments. J Appl Polym Sci 2009. [DOI: 10.1002/app.29753] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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166
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Mocanu G, Mihai D, LeCerf D, Picton L, Moscovici M. Cyclodextrin-anionic polysaccharide hydrogels: Synthesis, characterization, and interaction with some organic molecules (water pollutants, drugs, proteins). J Appl Polym Sci 2009. [DOI: 10.1002/app.29580] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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167
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Uyar T, Havelund R, Nur Y, Hacaloglu J, Besenbacher F, Kingshott P. Molecular filters based on cyclodextrin functionalized electrospun fibers. J Memb Sci 2009. [DOI: 10.1016/j.memsci.2009.01.047] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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168
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Uyar T, Havelund R, Hacaloglu J, Zhou X, Besenbacher F, Kingshott P. The formation and characterization of cyclodextrin functionalized polystyrene nanofibers produced by electrospinning. NANOTECHNOLOGY 2009; 20:125605. [PMID: 19420474 DOI: 10.1088/0957-4484/20/12/125605] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Polystyrene (PS) nanofibers containing the inclusion complex forming beta-cyclodextrin (beta-CD) were successfully produced by electrospinning aimed at developing functional fibrous nanowebs. By optimization of the electrospinning parameters, which included varying the relative concentration of PS and beta-CD in the solutions, bead-free fibers were produced. Homogeneous solutions of beta-CD and PS in dimethylformamide (DMF) were used with concentrations of PS varying from 10% to 25% (w/v, with respect to DMF), and beta-CD concentrations of 1% to 50% (w/w, with respect to PS). The presence of beta-CD facilitated the production of bead-free PS fibers even from lower polymer concentrations as a result of the higher conductivity of the PS/CD solutions. The morphology and the production of bead-free PS/CD fibers were highly dependent on the beta-CD contents. Transmission electron microscope (TEM) and atomic force microscope (AFM) images showed that incorporation of beta-CD yielded PS fibers with rougher surfaces. Thermogravimetric analysis (TGA) and direct insertion probe pyrolysis mass spectroscopy (DP-MS) results confirmed the presence of beta-CD in the PS fibers. X-ray diffraction (XRD) spectra of the fibers indicated that the beta-CD molecules are distributed within the PS matrix without any phase separated crystalline aggregates up to 40% (w/w) beta-CD loading. Furthermore, chemical analyses by Fourier transform infrared (FTIR) spectroscopy studies confirm that beta-CD molecules are located within the PS fiber matrix. Finally, preliminary investigations using x-ray photoelectron spectroscopy (XPS) and time-of-flight static secondary ion mass spectrometry (ToF-static-SIMS) show the presence of the cyclodextrin molecules in the outer molecular layers of the fiber surfaces. The XPS and ToF-SIMS findings indicate that cyclodextrin functionalized PS webs would have the potential to be used as molecular filters and/or nanofilters for the purposes of filtration/purification/separation owing to surface associated beta-CD molecules which have inclusion complexation capability.
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Affiliation(s)
- Tamer Uyar
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, Denmark.
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169
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Akceylan E, Bahadir M, Yilmaz M. Removal efficiency of a calix[4]arene-based polymer for water-soluble carcinogenic direct azo dyes and aromatic amines. JOURNAL OF HAZARDOUS MATERIALS 2009; 162:960-966. [PMID: 18599207 DOI: 10.1016/j.jhazmat.2008.05.127] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2008] [Revised: 05/24/2008] [Accepted: 05/26/2008] [Indexed: 05/26/2023]
Abstract
A Mannich base derivative of 5,11,17,23-tetrakis-[(1,4-dioxa-8-azaspiro-[4.5]decanyl)methyl]-25,26,27,28-tetrahydroxy calix[4]arene 3 was synthesized by the treatment of calix[4]arene with a cyclic secondary amine (1,4-dioxa-8-azaspiro-[4.5]decane) and formaldehyde. The compound 3 was treated with dibromoxylene to obtain a calix[4]arene-based copolymer 4. In batch sorption experiments of selected carcinogenic azo dyes and aromatic amines, the compounds 3 and 4 were found to be a better sorbent for azo dyes than for the aromatic amines. It was observed that the percentage of azo dye removal was 95-99% for compound 3 and 83-97% for 4 when the pH of the dye solution was in the range of 2.0-8.0. The sorption of azo dyes and aromatic amines by calix[4]arenes-based compounds indicates that amino groups play the major role for the formation of hydrogen bonds and electrostatic interactions.
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Affiliation(s)
- Ezgi Akceylan
- Department of Chemistry, Selcuk University, Konya, Turkey
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170
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Uyar T, Balan A, Toppare L, Besenbacher F. Electrospinning of cyclodextrin functionalized poly(methyl methacrylate) (PMMA) nanofibers. POLYMER 2009. [DOI: 10.1016/j.polymer.2008.11.021] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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171
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Ahmaruzzaman M. Adsorption of phenolic compounds on low-cost adsorbents: A review. Adv Colloid Interface Sci 2008; 143:48-67. [PMID: 18786665 DOI: 10.1016/j.cis.2008.07.002] [Citation(s) in RCA: 375] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2007] [Revised: 06/04/2008] [Accepted: 07/15/2008] [Indexed: 11/28/2022]
Abstract
Adsorption techniques are widely used to remove certain classes of pollutants from wastewater. Phenolic compounds represent one of the problematic groups. Although commercial activated carbon is a preferred adsorbent for phenol removal, its widespread use is restricted due to the high cost. As such, alternative non-conventional adsorbents have been investigated. The natural materials, waste materials from industry and agriculture and bioadsorbents can be employed as inexpensive adsorbents. The review (i) presents a critical analysis of these materials; (ii) describes their characteristics, advantages and limitations; and (iii) discusses the various mechanisms involved. There are several issues and drawbacks concerned on the adsorption of phenolic compounds that have been discussed in this review article. It is evident from the review that low-cost adsorbents have demonstrated high removal capabilities for certain phenolic compounds. In particular, industrial waste might be a promising adsorbent for environmental and purification purposes.
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Affiliation(s)
- Md Ahmaruzzaman
- Department of Chemistry, National Institute of Technology Silchar, Assam, 788010, India.
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172
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Zhao D, Zhao L, Zhu CS, Huang WQ, Hu JL. Water-insoluble β-cyclodextrin polymer crosslinked by citric acid: synthesis and adsorption properties toward phenol and methylene blue. J INCL PHENOM MACRO 2008. [DOI: 10.1007/s10847-008-9507-4] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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173
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Moon JY, Jung HJ, Moon MH, Chung BC, Choi MH. Inclusion complex-based solid-phase extraction of steroidal compounds with entrapped beta-cyclodextrin polymer. Steroids 2008; 73:1090-7. [PMID: 18547597 DOI: 10.1016/j.steroids.2008.04.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2007] [Revised: 04/14/2008] [Accepted: 04/15/2008] [Indexed: 11/19/2022]
Abstract
Although the hydrophobic interaction-based solid-phase extraction (SPE) has been widely used, the extraction yields of steroids including androgens, estrogens, and corticoids were slightly different along with the physical and chemical properties of each molecule. A new SPE technique based on the formation of an inclusion complex with beta-cyclodextrin (betaCD) has been achieved for comprehensive sample purification in mass spectrometric analysis of 45 endogenous or synthetic androgens, 11 endogenous estrogens, and 21 corticoids. A copolymer of betaCD with epichlorohydrin was prepared by a cross-linking reaction followed by entrapment with 0.3M CaCl(2) to yield an improved SPE sorbent and the hydrolyzed urine samples were applied for purification. Steroidal compounds tested on the entrapped betaCD polymer were extracted with tetrahydrofuran and the overall recoveries ranged from 82% to 112% for 77 steroids in urine. Especially, the hydroxylated estrogens showed an excellent binding capacity (96-116% recovery) to betaCD through hydrogen bonding between their phenolic hydroxyl and exterior hydroxyl groups. A comparison between SPE methods with betaCD and Oasis HLB as a conventional cartridge showed that the extraction efficiency of polar steroids was significantly increased in the betaCD experiment, which has no connection with different polarity of steroid molecules. Due to its multi-functional mechanism derived from molecular inclusion and chemical interactions, this new SPE sorbent resulted in better selectivity and extraction efficiency than that obtained using the conventionally used hydrophobicity-based SPE method.
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Affiliation(s)
- Ju-Yeon Moon
- Life Sciences Division, Korea Institute of Science and Technology, 39-1 Hawolkok-dong, Seoul 136-791, Korea; Deparment of Chemistry, Yonsei University, 134 Sinchon-dong, Seoul 120-749, Korea
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174
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Moon JY, Kim JY, Moon MH, Chung BC, In MK, Choi MH. Validated gas chromatographic–mass spectrometric analysis of urinary cannabinoids purified with a calcium-hardened β-cyclodextrin polymer. J Chromatogr A 2008; 1204:87-92. [DOI: 10.1016/j.chroma.2008.07.083] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2008] [Revised: 07/16/2008] [Accepted: 07/17/2008] [Indexed: 10/21/2022]
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175
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Solid-phase Assisted Refolding of Carbonic Anhydrase Using β-Cyclodextrin-Polyurethane Polymer. Protein J 2008; 27:334-42. [DOI: 10.1007/s10930-008-9142-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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176
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dos Santos JFR, Couceiro R, Concheiro A, Torres-Labandeira JJ, Alvarez-Lorenzo C. Poly(hydroxyethyl methacrylate-co-methacrylated-beta-cyclodextrin) hydrogels: synthesis, cytocompatibility, mechanical properties and drug loading/release properties. Acta Biomater 2008; 4:745-55. [PMID: 18291738 DOI: 10.1016/j.actbio.2007.12.008] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2007] [Revised: 12/20/2007] [Accepted: 12/20/2007] [Indexed: 10/22/2022]
Abstract
Copolymerization of hydroxyethyl methacrylate (HEMA) with a methacrylated-derivative of beta-cyclodextrin (beta-CD) was evaluated as a way to obtain hydrogels with tunable mechanical and drug loading and release properties, particularly for preparing medicated soft contact lenses. A fully methacrylated beta-CD monomer was synthesized and added to the HEMA and cross-linker solution at concentrations ranging from 0.042 to 0.333 g ml(-1) (i.e. 0.23-1.82 mol.%). Thermal polymerization led to transparent hydrogels with a degree of conversion above 74%, which showed a high cytocompatibility and did not induce macrophage response. The greater the content in methacrylated beta-CD was, the higher the glass transition temperature, the lower the degree of swelling and free water proportion, and the greater the storage and loss moduli of the swollen disks. These findings are directly related to the increase in the degree of cross-linking caused by the methacrylated beta-CD. Loading studies were carried out with hydrocortisone and acetazolamide, both able to form complexes with CDs in water and in lacrimal fluid. Hydrocortisone loading progressively decreased as the content in methacrylated beta-CD rose due to a decrease in the volume of aqueous phase of the hydrogel. Acetazolamide loading showed a maximum for an intermediate content in beta-CD (0.125-0.167 g ml(-1)) owing to a balance between complexation with beta-CD and hydrogel mesh size. The hydrogels sustained drug delivery for several days, the acetazolamide release rate being dependent on the beta-CD content. An adequate selection of the content in beta-CD enables pHEMA-co-beta-CD hydrogels suitable for specific biomedical applications to be obtained.
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177
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Bernat V, Ringard-Lefebvre C, Bas GL, Perly B, Djedaïni-Pilard F, Lesieur S. Inclusion complex of n-octyl beta-D-glucopyranoside and alpha-cyclodextrin in aqueous solutions: thermodynamic and structural characterization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:3140-3149. [PMID: 18324857 DOI: 10.1021/la7034906] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Complex formation between octyl beta-D-glucopyranoside (OG) and alpha-cyclodextrin (alphaCD) was investigated on the basis of three highly accurate and appropriate experimental techniques. First, surface tension measurements showed that alphaCD directly acts on the surfactant monomers in the aqueous phase, leading to progressive depletion of the air-water interface with increasing cyclodextrin contents. Significant shift of OG critical micelle concentration (cmc) was consequently observed: the higher alphaCD concentration, the higher the cmc value. Experiments performed at surfactant and cyclodextrin concentrations in the Gibbs regime of surface tension versus OG content were performed on one hand to establish Job's plot that showed 1:1 stoichiometry of the OG-alphaCD complex and on the other hand to calculate the association constant found equal to (1.85 +/- 0.35) x 10(3) L mol(-1). An inclusion process of the surfactant alkyl residue within the cyclodextrin cavity was confirmed by one-dimensional (1)H NMR, and the structure of the mixed assembly was extensively characterized by two-dimensional NOESY (1)H NMR. OG penetrates alphaCD so that its hydrocarbon chain is embedded inside the cyclodextrin cavity, and its polar head as well as the alpha-methylene group emerges outside the alphaCD secondary face. Solubility behavior of the OG-alphaCD complex in a wide range of host-guest ratios and concentrations was finally examined by turbidity recording and optical microscopy. At very low free cyclodextrin levels in the solution, the complex presented high solubility behavior up to more than 70 mM. By increasing nonassociated alphaCD in the mixture, propensity of the cyclodextrin molecules to crystallize was observed at concentrations far below the 100 mM aqueous solubility of the pure cyclodextrin. The hexagonal shape of the crystals seen in the optical microscopy images suggested they were, partially at least, composed of the solid complex.
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Affiliation(s)
- Valérie Bernat
- Laboratoire Physico-Chimie Pharmacotechnie Biopharmacie, Faculté de pharmacie, UMR CNRS 8612, Université Paris-Sud, 5 rue Jean-Baptiste Clément, F-92296 Châtenay-Malabry Cedex, France
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178
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Ozmen EY, Sezgin M, Yilmaz A, Yilmaz M. Synthesis of beta-cyclodextrin and starch based polymers for sorption of azo dyes from aqueous solutions. BIORESOURCE TECHNOLOGY 2008; 99:526-31. [PMID: 17350830 DOI: 10.1016/j.biortech.2007.01.023] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2006] [Revised: 01/03/2007] [Accepted: 01/08/2007] [Indexed: 05/14/2023]
Abstract
Three beta-cyclodextrin (polymers 1-3) and a starch-based (polymer 4) polymers were synthesized using hexamethylene diisocyanate (HMDI) as a cross-linking agent in dry dimethylformamide and used as a sorbent for the removal of some selected azo dyes from aqueous solutions. The cross-linked polymers were characterized by Fourier transform infrared spectroscopy, thermogravimetric and differential scanning calorimetric analysis. Results of sorption showed that cyclodextrin and starch based polymers can be effectively used as a sorbent for the removal of anionic azo dyes. The Influence of the amide groups and the chemical structure of azo dyes are also studied. Results of sorption experiments showed that these adsorbent exhibited high sorption capacities toward Direct Violent 51 (80% for polymer 1, 69% for polymer 2, 70% for polymer 3 and 78% for polymer 4). The sorption capacity of dyes on the polymers was dependent on the presence of sulfonate groups of the anionic dyes. In order to explain the results an adsorption mechanism mainly physical adsorption and interactions such as hydrogen bonding, ion-exchange due to the nature of the polymer network and the formation of an inclusion complex due to the beta-CD molecules through host-guest interaction is proposed.
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179
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Sorption of pindolol and related compounds by a β-cyclodextrin polymer: Isosteric heat of sorption. Carbohydr Polym 2008. [DOI: 10.1016/j.carbpol.2007.06.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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180
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Çelik S, Özyürek M, Güçlü K, Apak R. CUPRAC total antioxidant capacity assay of lipophilic antioxidants in combination with hydrophilic antioxidants using the macrocyclic oligosaccharide methyl β-cyclodextrin as the solubility enhancer. REACT FUNCT POLYM 2007. [DOI: 10.1016/j.reactfunctpolym.2007.07.045] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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181
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Poon KHN, Cheng YL. A quartz crystal microbalance study of β-cyclodextrin self assembly on gold and complexation of immobilized β-cyclodextrin with adamantane derivatives. J INCL PHENOM MACRO 2007. [DOI: 10.1007/s10847-007-9380-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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182
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Ozmen EY, Yilmaz M. Use of beta-cyclodextrin and starch based polymers for sorption of Congo red from aqueous solutions. JOURNAL OF HAZARDOUS MATERIALS 2007; 148:303-10. [PMID: 17363149 DOI: 10.1016/j.jhazmat.2007.02.042] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2006] [Revised: 02/11/2007] [Accepted: 02/12/2007] [Indexed: 05/14/2023]
Abstract
Two starch-based and a beta-cyclodextrin (beta-CD)-based polymers were synthesized using 4,4'-methylene-bis-phenyldiisocyanate (MDI) or hexamethylenediisocyanate (HMDI) as a cross linking agent in dry dimethylformamide and used as a sorbent for the removal of Congo red from aqueous solutions. The cross-linked polymers were characterized by Fourier transform infrared spectroscopy, thermogravimetric and differential scanning calorimetric analysis. The dye adsorption experiments were carried out by using batch and recycling column procedure. The effects of initial pH (pH(0)), the contact time and the initial dye concentration were changed to obtain the best experimental conditions. The pH(0) of the dye solution strongly affected the chemistry of both the dye molecules and polymer 3 in an aqueous solution. The effective pH(0) was 7.0 for adsorption on polymer 3. The equilibrium adsorption data were interpreted using Langmuir and Freundlich models. The adsorption of Congo red was better represented by the Freundlich equation.
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183
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Cesteros LC, Ramírez CA, Peciña A, Katime I. Synthesis and Properties of Hydrophilic Networks Based on Poly(ethylene glycol) andβ-Cyclodextrin. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200700109] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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184
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Yazdanparast R, Khodarahmi R. Evaluation of artificial chaperoning behavior of an insoluble cyclodextrin-rich copolymer: Solid-phase assisted refolding of carbonic anhydrase. Int J Biol Macromol 2007; 40:319-26. [PMID: 17027077 DOI: 10.1016/j.ijbiomac.2006.08.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2006] [Revised: 07/12/2006] [Accepted: 08/24/2006] [Indexed: 10/24/2022]
Abstract
Insoluble beta-cyclodextrin (beta-CD) copolymers have been used for the refolding of thermally and/or chemically denatured carbonic anhydrase with refolding yield of 40% using 300 mg of the copolymer/ml refolding solution containing 0.042 mg/ml protein. In an attempt to enhance the refolding yield with lower quantities of the copolymer, a new beta-CD-rich copolymer with higher beta-CD content was synthesized. Regarding the need for rapid stripping of the detergent molecules from the detergent-protein complexes formed in the capture step of the technique (artificial chaperone-assisted refolding), experimental variables (e.g. copolymer and the protein contents) were optimized to improve the refolding yields along with depressing the aggregate formation. In addition, comparative studies using different ionic detergents and the copolymer were conducted to get a more comprehensive understanding of the detergent's tail length in the stripping step of the process. Our results indicated that under the optimal developed refolding environment, the denatured CA was refolded with a yield of 75% using only 5mg of the copolymer/1.2 ml refolding solution containing 0.0286 mg/ml protein. Taking into account the recycling potential of the copolymer, the new resin, with significant cost-cutting capability, is a suitable candidate for industrial applications.
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Affiliation(s)
- Razieh Yazdanparast
- Institute of Biochemistry and Biophysics, PO Box 13145-1384, The University of Tehran, Tehran, Iran.
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185
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García-Zubiri IX, González-Gaitano G, Isasi JR. Isosteric heats of sorption of 1-naphthol and phenol from aqueous solutions by β-cyclodextrin polymers. J Colloid Interface Sci 2007; 307:64-70. [PMID: 17141797 DOI: 10.1016/j.jcis.2006.10.076] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2006] [Revised: 10/27/2006] [Accepted: 10/30/2006] [Indexed: 10/23/2022]
Abstract
The sorption of phenol and 1-naphthol from aqueous solutions by beta-cyclodextrin polymers has been analyzed using the isosteric heat approach. This has proven to be a useful tool for comparing the interactions between the sorbents and the sorbates. With the purpose of ascertaining the role of the cyclodextrin cavities and the crosslinking network in the sorption process, analogous sucrose polymers have been prepared using the same crosslinking reagents (epichlorohydrin, succinyl chloride, 1,6-hexamethylene diisocyanate, and toluene-2,4-diisocyanate). The two studied sorbates, phenol and 1-naphthol, also show important differences in their affinities for the cyclodextrin cavities and the crosslinking networks.
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Affiliation(s)
- Iñigo X García-Zubiri
- Departamento de Química y Edafología, Facultad de Ciencias, Universidad de Navarra, 31080 Pamplona, Navarra, Spain
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186
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Lipka E, Bonte J, Vaccher C. Direct Enantiomeric Separation and Determination of Enantiomeric Purity of Methoxytetrahydro‐Naphthalene Derivatives and Melatonin Ligands by HPLC using RSP‐β‐Cyclodextrin as Chiral Stationary Phase. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070600598571] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- E. Lipka
- a Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques , Université de Lille , Lille Cedex, France
| | - J.‐P. Bonte
- a Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques , Université de Lille , Lille Cedex, France
| | - C. Vaccher
- a Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques , Université de Lille , Lille Cedex, France
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187
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Ozmen EY, Sirit A, Yilmaz M. A Calix[4]arene Oligomer and Two Beta‐cyclodextrin Polymers: Synthesis and Sorption Studies of Azo Dyes. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2007. [DOI: 10.1080/10601320601031333] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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188
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Binello A, Robaldo B, Barge A, Cavalli R, Cravotto G. Synthesis of cyclodextrin-based polymers and their use as debittering agents. J Appl Polym Sci 2007. [DOI: 10.1002/app.27249] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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189
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Li F, Sun X, Zhang H, Li B, Gan F. Pyromellitic dianhydride-modified β-cyclodextrin microspheres for Pb(II) and Cd(II) adsorption. J Appl Polym Sci 2007. [DOI: 10.1002/app.26376] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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190
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Rodriguez-Tenreiro C, Alvarez-Lorenzo C, Rodriguez-Perez A, Concheiro A, Torres-Labandeira JJ. New Cyclodextrin Hydrogels Cross-Linked with Diglycidylethers with a High Drug Loading and Controlled Release Ability. Pharm Res 2006; 23:121-30. [PMID: 16320002 DOI: 10.1007/s11095-005-8924-y] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2005] [Accepted: 10/03/2005] [Indexed: 10/25/2022]
Abstract
PURPOSE The goal of the study is to develop new hydrogels based on cyclodextrins cross-linked with ethyleneglycol diglycidylether (EGDE) under mild conditions, to be used as carriers of amphiphilic drugs. Also, it aims to characterize the cross-linking and the drug loading and release processes. METHODS The cross-linking of hydroxypropyl-beta-cyclodextrin (HPbetaCD) with EGDE, in the absence or presence of hydroxypropylmethylcellulose (HPMC) Methocel K4M, was optimized applying oscillatory rheometry and Fourier transform infrared. Hydrogels were characterized regarding swelling in water, ability to load diclofenac, and release after different drying treatments. RESULTS Solutions of HPbetaCD (14.28%), without or with HPMC (0.2-1.0%), provided firm and transparent hydrogels after cross-linking with EGDE (14.28%), in which around two thirds of the OH groups were cross-linked. The incorporation of HPMC progressively reduced the gel time and the swelling degree of hydrogels. HPbetaCD hydrogels efficiently loaded diclofenac and sustained the release for several hours. The presence of HPMC slowed the release from swollen hydrogels, but promoted it from hydrogels dried before the loading and also before the release. CONCLUSIONS HPbetaCD hydrogels with good mechanical properties and tunable loading and release ability can be obtained by direct cross-linking with EGDE.
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Affiliation(s)
- Carmen Rodriguez-Tenreiro
- Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
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191
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Yazdanparast R, Esmaeili MA, Khodarahmi R. Protein refolding assisted by molecular tube based α-cyclodextrin as an artificial chaperone. BIOCHEMISTRY (MOSCOW) 2006; 71:1298-306. [PMID: 17223780 DOI: 10.1134/s0006297906120029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In this study, we evaluated, for the first time, the application of molecular tube based alpha-cyclodextrin for improving the refolding yields of two different enzymes: carbonic anhydrase and alkaline phosphatase. Our results indicate that under the optimal developed refolding environments, the denatured carbonic anhydrase and alkaline phosphatase were refolded with a yield of 51 and 61% using 15 and 5 mg/ml of the molecular tube, respectively. Regardless of lower refolding yields compared with liquid-phase artificial chaperone assisted approach, the new technique (solid-phase artificial chaperone assisted refolding) benefits from easier and faster separation of the refolded product from the refolding environment, recycling of the stripping agent, and finally, significantly less environmental effect at the industrial levels. However, further improvements in solid-phase artificial chaperone assisted technique are needed either through synthesizing better stripping agents or by optimizing and defining better refolding environments.
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Affiliation(s)
- Razieh Yazdanparast
- Institute of Biochemistry and Biophysics, The University of Tehran, Tehran, Iran.
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192
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Delval F, Crini G, Vebrel J. Removal of organic pollutants from aqueous solutions by adsorbents prepared from an agroalimentary by-product. BIORESOURCE TECHNOLOGY 2006; 97:2173-81. [PMID: 16275061 DOI: 10.1016/j.biortech.2005.09.022] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2004] [Revised: 09/05/2005] [Accepted: 09/22/2005] [Indexed: 05/05/2023]
Abstract
Two series of crosslinked starch polymers were tested for their ability to adsorb organic pollutants in aqueous solutions. The polymers were prepared by a crosslinking reaction of starch-enriched flour using epichlorohydrin as the crosslinking agent, without and in the presence of NH(4)OH. These polymers were used as sorbent materials for the removal of phenolic derivatives from wastewater. The influence of several parameters (kinetics, pH and polymer structure) on the sorption capacity was evaluated using the batch and the open column methods. Results of adsorption experiments showed that the starch-based materials exhibited high sorption capacities toward phenolic derivatives. The study of the kinetics of pollutant uptake revealed that the adsorbents presented a relatively fast rate of adsorption. The experimental data were examined using the Langmuir and Freundlich models and it was found that the Freundlich model appeared to fit the isotherm data better than the Langmuir model.
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Affiliation(s)
- Franck Delval
- Département de Chimie Minérale, Analytique et Appliquée, Université de Genève, 30 quai Ansermet, CH 1211 Genève 4, Switzerland
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193
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194
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Wang J, Jiang M. Polymeric Self-Assembly into Micelles and Hollow Spheres with Multiscale Cavities Driven by Inclusion Complexation. J Am Chem Soc 2006; 128:3703-8. [PMID: 16536543 DOI: 10.1021/ja056775v] [Citation(s) in RCA: 174] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The inclusion complexation between beta-CD (beta-cyclodextrin) and adamantyl group (ADA) is used as a driving force in constructing polymeric micelles. The micelles composed of a hydrophobic core of PtBA-ADA and a hydrophilic shell of PGMA-CD show unique properties due to the presence of beta-CDs on the micellar surface. The micelles can be converted to hollow spheres of PGMA-CD networks. The hollow spheres possess a central hole in the size of submicrometers and many cavities of beta-CDs of 0.7 nm on the surface.
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Affiliation(s)
- Jing Wang
- Department of Macromolecular Science and the Key Laboratory of Molecular Engineering of Polymers Fudan University, Shanghai, 200433, China
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195
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Cai X, Zhang A, Liu W. Environmental significance of the diclofop-methyl and cyclodextrin inclusion complexes. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2006; 41:1115-29. [PMID: 16923595 DOI: 10.1080/03601230600851216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Cyclodextrins (CDs) possess a hydrophilic external surface and a hydrophobic cavity. They are thus highly soluble and, in the meantime, effectively form inclusion complexes with hydrophobic organic compounds to enhance their solubilities. In this study, the complexation between modified beta-CDs and the herbicide diclofop-methyl (DM), (2-(4-(2,4-dichlorophenoxy)-phenoxy) propionate), was investigated. The complexation was confirmed by the shifts in the wavelengths of maximum ultra violet (UV) absorption and fluorescence excitation/emission. The deuterium isotope effects indicate that in the presence of beta-CDs the solubility of DM was lower while that of diclofop was higher in D2O than in H2O, suggesting the primary role of hydrophobic interactions in complexation. The solubility of DM was enhanced in the presence of beta-CDs, the extent of which depended on the modification of beta-CDs. The complexation reduced the hydrolysis of DM and hence increased its stability. The small inconsistency in the power of beta-CDs between hydrolysis retardation and solubilization suggests that hydrolysis was affected by the properties of beta-CDs and the configuration of DM in the complexes. Use of beta-CDs may thus result in the mobilization of soil DM. Properly modified beta-CDs may be utilized as formulation additives for improved delivery of DM and for enhanced environmental remediation.
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Affiliation(s)
- Xiyun Cai
- Research Center of Environmental Science, College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, People's Republic of China
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196
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Cesteros LC, Ramírez CA, Peciña A, Katime I. Poly(ethylene glycol-β-cyclodextrin) gels: Synthesis and properties. J Appl Polym Sci 2006. [DOI: 10.1002/app.24390] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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197
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Binding of dibenzofuran and its derivatives to water-soluble β-cyclodextrin polymers. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2005.04.022] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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198
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Yazdanparast R, Khodarahmi R, Soori E. Comparative studies of the artificial chaperone-assisted refolding of thermally denatured bovine carbonic anhydrase using different capturing ionic detergents and beta-cyclodextrin. Arch Biochem Biophys 2005; 437:178-85. [PMID: 15850557 DOI: 10.1016/j.abb.2005.03.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2005] [Revised: 02/01/2005] [Accepted: 03/04/2005] [Indexed: 11/28/2022]
Abstract
Artificial chaperone-assisted refolding has been shown to be an effective approach for improving the refolding yield of some of the denatured proteins. Since identical concentrations of various detergents do not induce similar variations in the protein structures, we arranged to evaluate the artificial chaperoning capabilities of several ionic detergents as a function of charge, structure, and the hydrophobic tail length of the detergent. Our results indicate that carbonic anhydrase can be refolded from its denatured state via artificial chaperone strategy using both anionic and cationic detergents. However, the extent of refolding assistance (kinetic and refolding yield) were different due to protein and detergent net charges, detergent concentrations, and the length of hydrophobic portion of each detergent. These observed differences were attributed to physical properties of CA-detergent complexes and/or to the kinetics of detergent stripping by beta-cyclodextrin from the protein-detergent complexes which is apparently dependent on the detergent-beta-CD association constants and the nature of the partially stripped complexes.
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Affiliation(s)
- Razieh Yazdanparast
- Institute of Biochemistry and Biophysics, University of Tehran, P.O. Box 13145-1384, Tehran, Iran.
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199
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Crini G. Recent developments in polysaccharide-based materials used as adsorbents in wastewater treatment. Prog Polym Sci 2005. [DOI: 10.1016/j.progpolymsci.2004.11.002] [Citation(s) in RCA: 1162] [Impact Index Per Article: 61.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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200
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Zohrehvand S, Evans CH. 2-Naphthol-containing ?-cyclodextrin-epichlorohydrin copolymers: synthesis, characterization and fluorescence studies. POLYM INT 2005. [DOI: 10.1002/pi.1747] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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