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Chitosan coated on the layers’ glucose oxidase immobilized on cysteamine/Au electrode for use as glucose biosensor. Biosens Bioelectron 2014; 60:271-6. [DOI: 10.1016/j.bios.2014.04.035] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 04/05/2014] [Accepted: 04/17/2014] [Indexed: 11/17/2022]
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2
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Zhang DH, Yuwen LX, Li C, Li YQ. Effect of poly(vinyl acetate-acrylamide) microspheres properties and steric hindrance on the immobilization of Candida rugosa lipase. BIORESOURCE TECHNOLOGY 2012; 124:233-236. [PMID: 22989650 DOI: 10.1016/j.biortech.2012.08.083] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Revised: 07/24/2012] [Accepted: 08/07/2012] [Indexed: 06/01/2023]
Abstract
Poly(vinyl acetate-acrylamide) microspheres were synthesized in the absence or presence of isooctane via suspension polymerization and utilized as carriers to immobilize Candida rugosa lipase. When the hydrophobic/hydrophilic surface characteristics of the microspheres were modified by changing the ratio of vinyl acetate (hydrophobic monomer) to acrylamide (hydrophilic monomer) from 50:50 to 86:24, the immobilization ratio changed from 45% to 92% and the activity of the immobilized lipase increased from 202.5 to 598.0 U/g microsphere. Excessive lipase loading caused intermolecular steric hindrance, which resulted in a decline in lipase activity. The maximum specific activity of the immobilized lipase (4.65 U/mg lipase) was higher than that of free lipase (3.00 U/mg lipase), indicating a high activity recovery during immobilization.
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Affiliation(s)
- Dong-Hao Zhang
- College of Pharmacy, Hebei University, Baoding 071002, China.
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3
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İlgü H, Turan T, Şanli-Mohamed G. Preparation, Characterization and Optimization of Chitosan Nanoparticles as Carrier for Immobilization of Thermophilic Recombinant Esterase. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2011. [DOI: 10.1080/10601325.2011.596050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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4
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Misdrahi MF, Wang M, Pradeep CP, Li FY, Lydon C, Xu L, Cronin L, Liu T. Amphiphilic properties of dumbbell-shaped inorganic-organic-inorganic molecular hybrid materials in solution and at an interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:9193-9202. [PMID: 21661766 DOI: 10.1021/la2013914] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Five novel dumbbell-shaped polyoxometalate (POM)-based inorganic-organic-inorganic molecular hybrids are investigated both in polar solvents and at interfaces for potential amphiphilic properties, which are compared with those of conventional surfactants. These hybrids with the general formula {P(2)V(3)W(15)}(2)-bis(TRIS)-linker are formed by linking two Wells-Dawson-type clusters, [P(2)V(3)W(15)O(62)](9-), with different linear bis(TRIS) linker ligands between the two TRIS moieties. Laser light scattering (LLS) studies reveal the presence of self-assembled vesicular structures in water/acetone mixed solvents, and the vesicle size increases with increasing acetone content, suggesting a charge-regulated process. The elastic constants, which are used to calculate the bending energy during vesicle formation, reveal that the organic ligands play an important role in determining the self-assembly process and that the hybrids do demonstrate amphiphilic behavior at the water/air interface. Furthermore, it is shown that some of the hybrids form monolayers at the interface, with an average molecular area that can be correlated with their organic linkers, as determined from their π-A isotherms. Finally, the hybrids not only display amphiphilic behavior akin to that of a surfactant but also exhibit an unusually high entropy contribution to vesicle formation as a result of their unique large, polar head groups, complex organic linkers, and their special molecular architectures as well as because of the involvement of the amphiphilic tetrabutylammonium (TBA) counterions.
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Affiliation(s)
- Mauricio F Misdrahi
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, USA
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5
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Salavati-Niasari M, Davar F, Mazaheri M. Synthesis of Mn3O4 nanoparticles by thermal decomposition of a [bis(salicylidiminato)manganese(II)] complex. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.04.015] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Phadtare S, D'Britto V, Pundle A, Prabhune A, Sastry M. Invertase-Lipid Biocomposite Films: Preparation, Characterization, and Enzymatic Activity. Biotechnol Prog 2008; 20:156-61. [PMID: 14763839 DOI: 10.1021/bp034236t] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The formation of biocomposite films of the industrially important enzyme invertase and fatty lipids under enzyme-friendly conditions is described. The approach involves a simple beaker-based diffusion protocol wherein invertase diffuses into the cationic lipid octadecylamine during immersion of the lipid film in the enzyme solution. Entrapment of invertase in the octadecylamine film is highly pH-dependent, underlining the role of attractive electrostatic interactions between the enzyme and the lipid in the biocomposite film formation. The kinetics of formation of the enzyme-lipid biocomposites has been studied by quartz crystal microgravimetry (QCM) measurements. The stability of the enzyme in the lipid matrix was confirmed by fluorescence spectroscopy and biocatalytic activity measurements. The biocatalytic activity of the invertase-lipid biocomposite films was comparable to that of the free enzyme in solution and showed marginally higher temperature stability. Particularly exciting was the excellent reuse characteristics of the biocomposite films, indicating potential industrial application of these films.
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Affiliation(s)
- Sumant Phadtare
- Materials Chemistry and Biochemical Sciences Divisions, National Chemical Laboratory, Pune 411 008, India
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7
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Pich AZ, Adler HJP. Composite aqueous microgels: an overview of recent advances in synthesis, characterization and application. POLYM INT 2007. [DOI: 10.1002/pi.2142] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Bhansali SH, Jarvis JM, Aksay IA, Carbeck JD. Enhanced resonator sensitivity with nanostructured porous silica coatings. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:6676-82. [PMID: 16831012 DOI: 10.1021/la051977q] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We present a strategy to increase the sensitivity of resonators to the presence of specific molecules in the gas phase, measured by the change in resonant frequency as the partial pressure of the molecule changes. We used quartz crystals as the resonators and coated them with three different thin films (<1 microm thick) of porous silica: silica xerogel, silica templated by an ordered hexagonal phase of surfactant micelles, and silica templated by an isotropic L3 phase surfactant micellar system. We compared the sensitivity of coated resonators to the presence of water vapor. The crystals coated with hexagonal phase-templated silica displayed a sensitivity enhancement up to 100-fold compared to an uncoated quartz crystal in the low-pressure regime where adsorption played a dominant role. L3 phase-templated silica displayed the highest sensitivity (up to a 4000-fold increase) in the high partial pressure regimes where capillary condensation was the main accumulation mechanism. Three parameters differentiate the contributions of these coatings to the sensitivity of the underlying resonator: (i) specific surface area per unit mass of the coating, (ii) accessibility of the surfaces to a target molecule, and (iii) distribution in the characteristic radii of curvature of internal surfaces, as measured by capillary condensation.
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Affiliation(s)
- S H Bhansali
- Department of Chemical Engineering, Princeton University, Princeton, NJ 08544-5263, USA
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Pich A, Bhattacharya S, Adler HJP, Wage T, Taubenberger A, Li Z, van Pee KH, Böhmer U, Bley T. Composite Magnetic Particles as Carriers for Laccase fromTrametes versicolor. Macromol Biosci 2006; 6:301-10. [PMID: 16572475 DOI: 10.1002/mabi.200500192] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In this paper we report a study of laccase immobilisation on different kinds of carrier particles. The immobilisation of enzyme on the particle surface with respect to the immobilisation efficiency and the properties of the immobilised enzymes is discussed. The immobilisation of laccase on polystyrene particles bearing reactive beta-diketone groups is characterised by high efficiency, but grafting of the enzyme increases the stability of the colloidal system, which makes the separation/purification procedure difficult. Additionally, the extreme colloidal stability of the immobilisates hinders the application of such particles with immobilised enzymes in some applications where the recycling of the enzyme should be performed. It has been found that hybrid PS-AAEM particles equipped with maghemite show similar immobilisation efficiency to that of their analogues without maghemite and can additionally be manipulated in magnetic fields. The activity of the immobilised laccase is much higher in the pH region 5-7 and the temperature range 50-70 degrees C as compared with that of the free enzyme. Immobilised enzymes also exhibit much better storage stability.
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Affiliation(s)
- Andrij Pich
- Institut für Makromolekulare Chemie und Textilchemie, Technische Universität Dresden, 01062 Dresden, Germany.
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10
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Temperature dependent activity and structure of adsorbed proteins on plasma polymerizedN-isopropyl acrylamide. Biointerphases 2006; 1:61. [DOI: 10.1116/1.2187980] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Vinod VP, Shinde S, d'Britto V, Shukla PG, Rao M. Preparation and Characterization of Urea-Formaldehyde-Pepsin Bioconjugate: A New Biocatalyst System. Biotechnol Prog 2006. [DOI: 10.1002/bp0602247] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Fujii T, Ogiwara D, Ohkawa K, Yamamoto H. Alkaline Phosphatase Encapsulated in Gellan-Chitosan Hybrid Capsules. Macromol Biosci 2005; 5:394-400. [PMID: 15895474 DOI: 10.1002/mabi.200400190] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Alkaline phosphatase (ALP) was encapsulated in gellan-chitosan polyion complex (PIC) capsules using a convenient procedure. The recovery of ALP was about 50% when the capsules were prepared by dropping a solution of ALP and gellan mixture (ALP/gellan) into a chitosan solution. When p-nitrophenyl phosphate (p-NPP) and 5-bromo-4-chloro-3-indolyl phosphate (BCIP) were incubated with ALP/gellan-chitosan capsules as substrates for ALP, the transparent colorless capsules changed to yellow and blue, respectively. The encapsulation of ALP into the PIC capsules was also confirmed by SDS-PAGE and immunoblot analyses. The ALP and polypeptides of more than 30 kDa remained without release even after incubation at 4 degrees C for 14 d. The biochemical properties of the encapsulated ALP activity were similar to those of the intact enzyme. When the solution containing p-NPP was loaded on a column packed with ALP/gellan-chitosan capsules at 27 degrees C, approximately 75% of p-NPP was hydrolyzed by passing through the column. No significant leakage of ALP was observed during the procedure, indicating that the capsules were resistant to pressure in the chromatographic operation. Furthermore, 70% of the hydrolytic activity of the packed capsules remained after storage at 4 degrees C for one month. These results suggest that the polyion complex capsules could be useful materials for protein fixation without chemical modification. [Diagram: see text] Encapsulation of ALP into PIC capsules and the morphological changes seen in the absence of the ALP substrate and in the presence of p-NPP and BICP.
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Affiliation(s)
- Toshihiro Fujii
- Department of Kansei Engineering, Faculty of Textile Science and Technology, Shinshu University, Tokida 3-15-1, Ueda 386-8567, Japan.
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Paul S, Huang J, Ichinose I. Enantioselective anion exchange on a positively charged poly(l-lysine) layer assembled on thin TiO2-gel films. NEW J CHEM 2005. [DOI: 10.1039/b503525b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Luo XL, Xu JJ, Du Y, Chen HY. A glucose biosensor based on chitosan–glucose oxidase–gold nanoparticles biocomposite formed by one-step electrodeposition. Anal Biochem 2004; 334:284-9. [PMID: 15494135 DOI: 10.1016/j.ab.2004.07.005] [Citation(s) in RCA: 271] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2004] [Indexed: 10/26/2022]
Abstract
An amperometric biosensor for the quantitative measurement of glucose is reported. The biosensor is based on a biocomposite that is homogeneous and easily prepared. This biocomposite is made of chitosan hydrogel, glucose oxidase, and gold nanoparticles by a direct and facile electrochemical deposition method under enzyme-friendly conditions. The resulting biocomposite provided a shelter for the enzyme to retain its bioactivity at considerably extreme conditions, and the decorated gold nanoparticles in the biocomposite offer excellent affinity to enzyme. The biosensor exhibited a rapid response (within 7s) and a linear calibration range from 5.0 microM to 2.4 mM with a detection limit of 2.7 microM for the detection of glucose. The combination of gold nanoparticles affinity and the promising feature of the biocomposite with the onestep nonmanual technique favor the sensitive determination of glucose with improved analytical capabilities.
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Affiliation(s)
- Xi-Liang Luo
- The Key Lab of Analytical Chemistry for Life Science, Department of Chemistry, Nanjing University, Nanjing 210093, People's Republic of China
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Mayya KM, Jain N, Gole A, Langevin D, Sastry M. Time-dependent complexation of glucose-reduced gold nanoparticles with octadecylamine Langmuir monolayers. J Colloid Interface Sci 2004; 270:133-9. [PMID: 14693145 DOI: 10.1016/j.jcis.2003.10.018] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
We report on the reduction of aqueous chloroaurate ions by glucose to form gold nanoparticles of uniform size. We further demonstrate the complexation of these particles with octadecylamine (ODA) monolayers at the air-water interface. Pressure-area (pi-A) isotherms as a function of time of complexation revealed a significant expansion of the monolayer. Surface pressure variation with time for constant areas after spreading of the monolayer was carried out to observe the kinetics of complexation of the colloidal particles at the interface. The kinetics of complexation of the particles at the interface was also monitored by Brewster angle microscopy (BAM) measurements. Langmuir-Blodgett films of the particles complexed with ODA were formed at a subphase pH of 9 onto different substrates. Quartz crystal microgravimetry (QCM) was used to quantify the amount of particles deposited per immersion cycle of the quartz crystal. The LB films were further characterized by UV-vis and transmission electron microscopy (TEM) measurements. TEM measurements indicate a close packed and equidistant arrangement of colloidal particles in the LB film, probably due to hydrogen-bonding interactions.
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Affiliation(s)
- K Murali Mayya
- Materials Chemistry Division, National Chemical Laboratory, Pune 411008, India
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Phadtare S, Vinod VP, Wadgaonkar PP, Rao M, Sastry M. Free-standing nanogold membranes as scaffolds for enzyme immobilization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:3717-23. [PMID: 15875405 DOI: 10.1021/la035870j] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
We demonstrate herein the formation of a free-standing gold nanoparticle membrane and its use in the immobilization of the enzyme, pepsin. The nanogold membrane is synthesized by the spontaneous reduction of aqueous chloroaurate ions at the liquid-liquid interface by the bifunctional molecule bis(2-(4-aminophenoxy)ethyl) ether (DAEE) taken in chloroform. This process results in the formation of a robust, malleable free-standing nanogold membrane consisting of gold nanoparticles embedded in a polymeric background. Recognizing that gold nanoparticles are excellent candidates for immobilization of enzymes, we have immobilized pepsin on the nanogold membrane, leading to a new class of biocatalyst. A highlight of the new pepsin-nanogold biocatalyst is the ease with which separation from the reaction medium may be achieved. The catalytic activity of pepsin in the bioconjugate was comparable to that of the free enzyme in solution. The pepsin-nanogold membrane bioconjugate material exhibited excellent biocatalytic activity over 10 successive reuse cycles as well as enhanced pH, temperature, and temporal stability.
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Affiliation(s)
- Sumant Phadtare
- Materials Chemistry, Biochemical Sciences, and Polymer Chemistry Divisions, National Chemical Laboratory, Pune-411 008, India
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17
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Phadtare S, Vinod VP, Mukhopadhyay K, Kumar A, Rao M, Chaudhari RV, Sastry M. Immobilization and biocatalytic activity of fungal protease on gold nanoparticle-loaded zeolite microspheres. Biotechnol Bioeng 2004; 85:629-37. [PMID: 14966804 DOI: 10.1002/bit.10856] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Gold nanoparticles are excellent biocompatible surfaces for the immobilization of enzymes. However, separation of the gold nanoparticle-enzyme bioconjugate material from the reaction medium is often difficult. In this study, we investigate the assembly of the gold nanoparticles on the surface of the amine-functionalized zeolite microspheres in the formation of zeolite-gold nanoparticle "core-shell" structures and, thereafter, the use of this structure in immobilization of fungal protease. The assembly of gold nanoparticles on the zeolite surface occurs through the amine groups present in 3-aminopropyltrimethoxysilane (3-APTS). The fungal proteases bound to the massive "core-shell" structures were easily separated from the reaction medium by mild centrifugation and exhibited excellent reuse characteristics. The biocatalytic activity of fungal protease in the bioconjugate was marginally enhanced relative to the free enzyme in solution. The bioconjugate material also showed significantly enhanced pH and temperature stability and a shift in the optimum temperature of operation.
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Affiliation(s)
- Sumant Phadtare
- Division of Materials Chemistry, National Chemical Laboratory, Pune 411 008, India
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Forzani ES, Teijelo ML, Nart F, Calvo EJ, Solís VM. Effect of the polycation nature on the structure of layer-by-layer electrostatically self-assembled multilayers of polyphenol oxidase. Biomacromolecules 2003; 4:869-79. [PMID: 12857067 DOI: 10.1021/bm0256855] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Self-assembled multilayers comprised of alternate layers of polyphenol oxidase (PPO) and poly(allylamine) (PAH) or PPO and poly(diallyldimethylamine) (PDDA), deposited on a 3-mercaptopropanesulfonic acid (MPS)-modified gold surface, were studied "in-situ" (under water) by means of ellipsometry and quartz crystal microbalance (QCM), and "ex-situ" (in open air) by ellipsometry and fourier transform infrared reflection-absorption spectroscopy (FT-IRRAS). Optical ellipsometric properties of (PAH)(n)(PPO)(n) and (PDDA)(n)(PPO)(n) multilayers were obtained at two wavelengths, employing an isotropic single-layer model with the substrate parameters measured after thiol adsorption. Film thickness as well as ellipsometric mass values based on the de Feijter equation were also evaluated. The quartz crystal impedance analysis showed that self-assembled multilayers behaved as acoustically thin films, and therefore, the shifts observed in the film inductive impedance parameter were interpreted in terms of gravimetric mass. The enzyme mass up-take in each adsorption step was determined on PAH or on PDDA topmost layer. A comparative study between the ellipsometric thickness and acoustic mass values allowed us to obtain average values of "apparent" densities of (2.1 +/- 0.1) and (2.4 +/- 0.1) g cm(-3) for (PAH)(n)(PPO)(n) and (PDDA)(n)(PPO)(n) multilayers, respectively. The content of water included in the open polymer-enzyme structure was evaluated by comparison of QCM and ellipsometric mass values. FT-IRRAS spectra of each layer in (PAH)(n)(PPO)(n) and (PDDA)(n)(PPO)(n) films were recorded, and the intensity ratio of the amide bands was evaluated to obtain information about layer-by-layer enzyme conformation. An enzyme/polycation distribution model for (PAH)(n)(PPO)(n)and (PDDA)(n)(PPO)(n) multilayer structures is presented on the basis of combined ellipsometric, QCM, and FT-IRRAS results.
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Affiliation(s)
- Erica S Forzani
- INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Pabellón 2, Ciudad Universitaria, AR-1428 Buenos Aires, Argentina
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Ahmad A, Mukherjee P, Senapati S, Mandal D, Khan M, Kumar R, Sastry M. Extracellular biosynthesis of silver nanoparticles using the fungus Fusarium oxysporum. Colloids Surf B Biointerfaces 2003. [DOI: 10.1016/s0927-7765(02)00174-1] [Citation(s) in RCA: 787] [Impact Index Per Article: 37.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Gole A, Thakar J, Sastry M. Protein diffusion into thermally evaporated lipid films: role of protein charge/mass ratio. Colloids Surf B Biointerfaces 2003. [DOI: 10.1016/s0927-7765(02)00141-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Chapter 7 Chemically modified electrodes with integrated biomolecules and molecular wires. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0166-526x(03)80112-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Bodas DS, Patil SJ, Mandale AB, Gangal SA. RF sputter deposition of poly(tetrafluoroethylene) films as masking materials for silicon micromachining. J Appl Polym Sci 2003. [DOI: 10.1002/app.13191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
The controlled assembly of nanoparticles in thin film form on solid supports, both as monolayers and as superlattice structures, is a problem of considerable topical interest. Among the many interactions used to program the assembly of nanoparticles, electrostatic forces are particularly interesting for many reasons. This Account deals with assembling surface-modified nanoparticles in thin film form using electrostatic interactions at the air-water interface and in thermally evaporated lipid films. The generality of the electrostatic assembly protocol is demonstrated in the immobilization of DNA and proteins in lipid films.
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Affiliation(s)
- Murali Sastry
- Materials Chemistry, Biochemical Sciences, and Organic Chemistry (Synthesis) Divisions, National Chemical Laboratory, Pune-411 008, India.
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25
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Studies on the formation of bioconjugates of Endoglucanase with colloidal gold. Colloids Surf B Biointerfaces 2002. [DOI: 10.1016/s0927-7765(01)00301-0] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Abstract
The immobilization of biomacromolecules such as proteins, enzymes and DNA in various inert matrices is a problem that attracts considerable attention and is motivated by fundamental, biomedical and industrial interests. In addition to several other entrapping matrices, lipids in the form of monolayers and bilayers are versatile hosts owing to their membrane-mimicking capability, bio-friendliness, flexibility and inertness. Here, we discuss the immobilization of proteins, enzymes and DNA via electrostatic interactions in films of thermally evaporated fatty lipids. The role of the lipid in preserving the natural conformation of the biomolecule, protection against harsh environmental conditions and accessibility to substrates and reagents is an important feature of the protocol and is highlighted.
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Affiliation(s)
- Murali Sastry
- Materials Chemistry Division, National Chemical Laboratory, 411 008, Pune, India.
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Sastry M, Ramakrishnan V, Pattarkine M, Ganesh KN. Studies on the Formation of DNA−Cationic Lipid Composite Films and DNA Hybridization in the Composites. J Phys Chem B 2001. [DOI: 10.1021/jp0034877] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Murali Sastry
- Materials and Organic Chemistry (Synthesis) Divisions, National Chemical Laboratory, Pune - 411008, India
| | - Vidya Ramakrishnan
- Materials and Organic Chemistry (Synthesis) Divisions, National Chemical Laboratory, Pune - 411008, India
| | - Mrunalini Pattarkine
- Materials and Organic Chemistry (Synthesis) Divisions, National Chemical Laboratory, Pune - 411008, India
| | - Krishna N. Ganesh
- Materials and Organic Chemistry (Synthesis) Divisions, National Chemical Laboratory, Pune - 411008, India
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Gole A, Sastry M. A new method for the generation of patterned protein films by encapsulation in arrays of thermally evaporated lipids. Biotechnol Bioeng 2001; 74:172-8. [PMID: 11370006 DOI: 10.1002/bit.1107] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In this article we demonstrate a versatile method for the generation of patterned protein films by encapsulation in arrays of the lipids, octadecylamine (ODA, cationic), and arachidic acid (AA, anionic). A simple 2 x 2 array of ODA and AA was vacuum deposited on different substrates using appropriate masks. Thereafter, the enzymes pepsin and fungal protease as well as the heme-proteins cytochrome c and hemoglobin were encapsulated in the different elements of the array by sequential immersion (combined with judicious masking) of the array elements in the different protein solutions. The proteins are incorporated into the lipid elements by electrostatic interaction between charged amino acid residues on the protein surface and charged functional groups in the lipid matrix. This procedure leads to spatially distinct regions of the different proteins on one substrate and shows promise for single-chip multianalyte immunoassay/multiplex, high-throughput biosensor and catalysis applications. Fourier transform infrared spectroscopy (FTIR) was used to monitor the incorporation of the proteins in the different elements of the array as well as to ascertain whether intermixing of the proteins in a particular array element had occurred. The heme-protein composite regions were further characterized using UV-VIS spectroscopy.
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Affiliation(s)
- A Gole
- Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India
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