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Perera HAG, Lu T, Fu L, Zhang J, Chen Z. Probing the Interfacial Interactions of Monoclonal and Bispecific Antibodies at the Silicone Oil-Aqueous Solution Interface by Using Sum Frequency Generation Vibrational Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14339-14347. [PMID: 31597425 DOI: 10.1021/acs.langmuir.9b02768] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Silicone oil has been widely utilized in the pharmaceutical industry especially as a lubricant coating commonly used in syringes for the smooth delivery of drugs. Protein structure perturbation and aggregation have been reported upon protein contacting silicone oil by using indirect methods and ex-situ techniques. The conclusions derived from such indirect and ex-situ methods may not truly reflect the exact nature of the protein-silicone oil interfacial interactions. Recently, we have successfully demonstrated that sum frequency generation (SFG) vibrational spectroscopy can be used as a powerful and direct method of studying the fusion protein-silicone oil interfacial interactions in situ and in real time. In this article, we studied monoclonal and bispecific antibody interactions with the silicone oil surface by using SFG spectroscopy. Being structurally and functionally different in the nature of fusion proteins and antibodies, this study is important in enhancing our current understanding of protein-silicone oil interfacial interactions. Both types of antibodies investigated here readily and strongly adsorb onto the silicone oil surface and remain stable at least for 10 h. SFG spectra in the amide I region for monoclonal and bispecific antibodies centered at 1660 and 1665 cm-1, respectively, suggest the difference in their molecular structures. The absence of the antibody signals in the amide I region of time-dependent and static SFG spectra obtained for preadsorbed antibodies onto silicone oil after contacting polysorbate 80 (PS-80) surfactant suggests that PS-80 can effectively remove both types of antibodies from the silicone oil surface. This study demonstrated the feasibility of using SFG spectroscopy as a powerful tool for probing the antibody-interfacial interactions in situ and in real time.
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Affiliation(s)
- H A Ganganath Perera
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Tieyi Lu
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Li Fu
- Sanofi , 1 The Mountain Road , Framingham , Massachusetts 01701 , United States
| | - Jifeng Zhang
- Sanofi , 1 The Mountain Road , Framingham , Massachusetts 01701 , United States
| | - Zhan Chen
- Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States
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2
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Large-volume sample stacking for the analysis of low molecular mass amines in steam water by CE using novel highly absorbing probe for indirect UV detection. Microchem J 2018. [DOI: 10.1016/j.microc.2017.10.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Li Y, Pan D, Nashine V, Deshmukh S, Vig B, Chen Z. Understanding Protein-Interface Interactions of a Fusion Protein at Silicone Oil-Water Interface Probed by Sum Frequency Generation Vibrational Spectroscopy. J Pharm Sci 2018; 107:682-689. [DOI: 10.1016/j.xphs.2017.09.029] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 08/29/2017] [Accepted: 09/27/2017] [Indexed: 11/16/2022]
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4
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Songjaroen T, Laiwattanapaisal W. Simultaneous forward and reverse ABO blood group typing using a paper-based device and barcode-like interpretation. Anal Chim Acta 2016; 921:67-76. [DOI: 10.1016/j.aca.2016.03.047] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 03/22/2016] [Accepted: 03/26/2016] [Indexed: 11/28/2022]
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5
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Sediq AS, van Duijvenvoorde RB, Jiskoot W, Nejadnik MR. No Touching! Abrasion of Adsorbed Protein Is the Root Cause of Subvisible Particle Formation During Stirring. J Pharm Sci 2016; 105:519-529. [PMID: 26869415 DOI: 10.1016/j.xphs.2015.10.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2015] [Revised: 08/07/2015] [Accepted: 10/05/2015] [Indexed: 01/15/2023]
Abstract
This study addressed the effect of contact sliding during stirring of a monoclonal antibody solution on protein aggregation, in particular, in the nanometer and micrometer size range. An overhead stirring set-up was designed in which the presence and magnitude of the contact between the stir bar and the container could be manipulated. A solution of 0.1 mg/mL of a monoclonal antibody (IgG) in phosphate buffered saline was stirred at 300 rpm at room temperature. At different time points, samples were taken and analyzed by nanoparticle tracking analysis, flow imaging microscopy, and size-exclusion chromatography. In contrast to non-contact-stirred and unstirred samples, the contact-stirred sample contained several-fold more particles and showed a significant loss of monomer. No increase in oligomer content was detected. The number of particles formed was proportional to the contact area and the magnitude of the normal pressure between the stir bar and the glass container. Extrinsic 9-(2,2-dicyanovinyl) julolidine fluorescence indicated a conformational change for contact-stirred protein samples. Presence of polysorbate 20 inhibited the formation of micron-sized aggregates. We suggest a model in which abrasion of the potentially destabilized, adsorbed protein leads to aggregation and renewal of the surface for adsorption of a fresh protein layer.
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Affiliation(s)
- Ahmad S Sediq
- Division of Drug Delivery Technology, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, 2300 RA, The Netherlands
| | - R B van Duijvenvoorde
- Division of Drug Delivery Technology, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, 2300 RA, The Netherlands
| | - Wim Jiskoot
- Division of Drug Delivery Technology, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, 2300 RA, The Netherlands.
| | - M Reza Nejadnik
- Division of Drug Delivery Technology, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, 2300 RA, The Netherlands.
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Kapp SJ, Larsson I, Van De Weert M, Cárdenas M, Jorgensen L. Competitive Adsorption of Monoclonal Antibodies and Nonionic Surfactants at Solid Hydrophobic Surfaces. J Pharm Sci 2015; 104:593-601. [DOI: 10.1002/jps.24265] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 10/23/2014] [Accepted: 10/23/2014] [Indexed: 01/01/2023]
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7
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Höger K, Mathes J, Frieß W. IgG1 Adsorption to Siliconized Glass Vials—Influence of pH, Ionic Strength, and Nonionic Surfactants. J Pharm Sci 2015; 104:34-43. [DOI: 10.1002/jps.24239] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 10/06/2014] [Accepted: 10/07/2014] [Indexed: 12/22/2022]
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8
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Robinson MK, Caudill SP, Koch DD, Ritchie J, Hortin G, Eckfeldt JH, Sandberg S, Williams D, Myers G, Miller WG. Albumin adsorption onto surfaces of urine collection and analysis containers. Clin Chim Acta 2014; 431:40-5. [PMID: 24513540 DOI: 10.1016/j.cca.2014.01.035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Revised: 01/20/2014] [Accepted: 01/21/2014] [Indexed: 11/28/2022]
Abstract
BACKGROUND Adsorption of albumin onto urine collection and analysis containers may cause falsely low concentrations. METHODS We added (125)I-labeled human serum albumin to urine and to phosphate buffered solutions, incubated them with 22 plastic container materials and measured adsorption by liquid scintillation counting. RESULTS Adsorption of urine albumin (UA) at 5-6 mg/l was <0.9%; and at 90 mg/l was <0.4%. Adsorption was generally less at pH8 than pH5 but only 3 cases had p<0.05. Adsorption from 11 unaltered urine samples with albumin 5-333 mg/l was <0.8%. Albumin adsorption for the material with greatest binding was extrapolated to the surface areas of 100 ml and 2l collection containers, and to instrument sample cups and showed <1% change in concentration at 5 mg/l and <0.5% change at 20 mg/l or higher concentrations. Adsorption of albumin from phosphate buffered solutions (2-28%) was larger than that from urine. CONCLUSIONS Albumin adsorption differed among urine samples and plastic materials, but the total influence of adsorption was <1% for all materials and urine samples tested. Adsorption of albumin from phosphate buffered solutions was larger than that from urine and could be a limitation for preparations used as calibrators.
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Affiliation(s)
- Mary K Robinson
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control & Prevention, Atlanta, GA, United States
| | - Samuel P Caudill
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control & Prevention, Atlanta, GA, United States
| | - David D Koch
- Grady Memorial Hospital and Emory University, Department of Pathology & Laboratory Medicine, Atlanta, GA, United States
| | - James Ritchie
- Emory University, Department of Pathology & Laboratory Medicine, Atlanta, GA, United States
| | - Glen Hortin
- Quest Diagnostics, Cincinnati, OH, United States
| | - John H Eckfeldt
- University of Minnesota, Department of Laboratory Medicine and Pathology Minneapolis, MN, United States
| | - Sverre Sandberg
- Laboratory of Clinical Biochemistry, Haukeland University Hospital and the Norwegian Quality Improvement of Primary Care Laboratories, Bergen, Norway
| | - Desmond Williams
- Division of Diabetes Translation, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control & Prevention, Atlanta, GA, United States
| | - Gary Myers
- American Association for Clinical Chemistry, Washington, DC, United States
| | - W Greg Miller
- Virginia Commonwealth University, Department of Pathology, Richmond, VA, United States.
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9
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Fine D, Grattoni A, Goodall R, Bansal SS, Chiappini C, Hosali S, van de Ven AL, Srinivasan S, Liu X, Godin B, Brousseau L, Yazdi IK, Fernandez-Moure J, Tasciotti E, Wu HJ, Hu Y, Klemm S, Ferrari M. Silicon micro- and nanofabrication for medicine. Adv Healthc Mater 2013; 2:632-66. [PMID: 23584841 PMCID: PMC3777663 DOI: 10.1002/adhm.201200214] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 08/31/2012] [Indexed: 12/13/2022]
Abstract
This manuscript constitutes a review of several innovative biomedical technologies fabricated using the precision and accuracy of silicon micro- and nanofabrication. The technologies to be reviewed are subcutaneous nanochannel drug delivery implants for the continuous tunable zero-order release of therapeutics, multi-stage logic embedded vectors for the targeted systemic distribution of both therapeutic and imaging contrast agents, silicon and porous silicon nanowires for investigating cellular interactions and processes as well as for molecular and drug delivery applications, porous silicon (pSi) as inclusions into biocomposites for tissue engineering, especially as it applies to bone repair and regrowth, and porous silica chips for proteomic profiling. In the case of the biocomposites, the specifically designed pSi inclusions not only add to the structural robustness, but can also promote tissue and bone regrowth, fight infection, and reduce pain by releasing stimulating factors and other therapeutic agents stored within their porous network. The common material thread throughout all of these constructs, silicon and its associated dielectrics (silicon dioxide, silicon nitride, etc.), can be precisely and accurately machined using the same scalable micro- and nanofabrication protocols that are ubiquitous within the semiconductor industry. These techniques lend themselves to the high throughput production of exquisitely defined and monodispersed nanoscale features that should eliminate architectural randomness as a source of experimental variation thereby potentially leading to more rapid clinical translation.
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Affiliation(s)
- Daniel Fine
- Department of Nanomedicine, The Methodist Hospital Research Institute, Houston, TX 77030, USA.
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10
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Haque AMJ, Khan MMI, Kim K. Facile degradation of benzenediazonium-grafted thick layers on the electrode surface enabling electrochemical biosensor application. Chem Commun (Camb) 2013; 49:3802-4. [DOI: 10.1039/c3cc00192j] [Citation(s) in RCA: 5] [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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11
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Optimization of protein patterns for neuronal cell culture applications. Biointerphases 2011; 6:105. [DOI: 10.1116/1.3624584] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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12
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Berlind T, Tengvall P, Hultman L, Arwin H. Protein adsorption on thin films of carbon and carbon nitride monitored with in situ ellipsometry. Acta Biomater 2011; 7:1369-78. [PMID: 20977950 DOI: 10.1016/j.actbio.2010.10.024] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Revised: 10/20/2010] [Accepted: 10/20/2010] [Indexed: 10/18/2022]
Abstract
Thin films of amorphous carbon and amorphous, graphitic and fullerene-like carbon nitride were deposited by reactive magnetron sputtering and optically characterized with spectroscopic ellipsometry. Complementary studies using scanning electron microscopy and atomic force microscopy were performed. The films were exposed to human serum albumin (HSA) and the adsorption was monitored in situ using dynamic ellipsometry. From the ellipsometric data the adsorbed amount of proteins was quantified in terms of surface mass density using de Feijter's model. The results indicate larger adsorption of proteins onto the amorphous films compared to the films with a more textured structure. Complementary studies with 125I-labeled HSA showed an apparent protein adsorption up to six times larger compared to the ellipsometry measurement. In addition, the four types of films were incubated in blood plasma followed by exposure to anti-fibrinogen, anti-HMWK or anti-C3c, revealing the materials' response to complement and contact activation. The amorphous and graphitic carbon nitride exhibit rather high immune activity compared to a titanium reference, whereas the amorphous carbon and the fullerene-like CNx show less immune complement deposition. Compared to the reference, all films exhibit indications of a stronger ability to initiate the intrinsic pathway of coagulation. Finally, the surfaces' bone-bonding ability was investigated by examination of their ability to form calcium phosphate crystals in a simulated body fluid, with a-CNx depositing most calcium phosphate after 21 days of incubation.
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13
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Fine D, Grattoni A, Hosali S, Ziemys A, De Rosa E, Gill J, Medema R, Hudson L, Kojic M, Milosevic M, Brousseau Iii L, Goodall R, Ferrari M, Liu X. A robust nanofluidic membrane with tunable zero-order release for implantable dose specific drug delivery. LAB ON A CHIP 2010; 10:3074-83. [PMID: 20697650 DOI: 10.1039/c0lc00013b] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
This manuscript demonstrates a mechanically robust implantable nanofluidic membrane capable of tunable long-term zero-order release of therapeutic agents in ranges relevant for clinical applications. The membrane, with nanochannels as small as 5 nm, allows for the independent control of both dosage and mechanical strength through the integration of high-density short nanochannels parallel to the membrane surface with perpendicular micro- and macrochannels for interfacing with the ambient solutions. These nanofluidic membranes are created using precision silicon fabrication techniques on silicon-on-insulator substrates enabling exquisite control over the monodispersed nanochannel dimensions and surface roughness. Zero-order release of analytes is achieved by exploiting molecule to surface interactions which dominate diffusive transport when fluids are confined to the nanoscale. In this study we investigate the nanofluidic membrane performance using custom diffusion and gas testing apparatuses to quantify molecular release rate and process uniformity as well as mechanical strength using a gas based burst test. The kinetics of the constrained zero-order release is probed with molecules presenting a range of sizes, charge states, and structural conformations. Finally, an optimal ratio of the molecular hydrodynamic diameter to the nanochannel dimension is determined to assure zero-order release for each tested molecule.
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Affiliation(s)
- Daniel Fine
- Department of Nanomedicine and Biomedical Engineering, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
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14
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Lin JJ, Meyer JD, Carpenter JF, Manning MC. Aggregation of human serum albumin during a thermal viral inactivation step. Int J Biol Macromol 2009; 45:91-6. [DOI: 10.1016/j.ijbiomac.2009.04.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2009] [Revised: 04/10/2009] [Accepted: 04/13/2009] [Indexed: 10/20/2022]
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15
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Koch K, Blecher IC, König G, Kehraus S, Barthlott W. The superhydrophilic and superoleophilic leaf surface of Ruellia devosiana (Acanthaceae): a biological model for spreading of water and oil on surfaces. FUNCTIONAL PLANT BIOLOGY : FPB 2009; 36:339-350. [PMID: 32688651 DOI: 10.1071/fp08295] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2008] [Accepted: 02/11/2009] [Indexed: 06/11/2023]
Abstract
Most leaves of plants are hydrophobic or even superhydrophobic. Surprisingly the leaves of the tropical herb of Ruellia devosiana Makoy ex E. Morr. Hort. (Acanthaceae) are superamphiphilic. Water droplets (10 µL) spread to a film with a contact angle of zero degree within less than 0.3 s. Such surfaces with a high affinity to water are termed superhydrophilic. Droplets of oil applied on R. devosiana leaves and replicas showed a similar spreading behaviour as water. These surfaces are superoleophilic, and in combination with their superhydrophilicity they are called superamphiphilic. Independent of the growing conditions, a reversibility of the superhydrophilicity in R. devosiana leaves was found. Additionally, on 90° tilted leaves a pressure free capillary transport of water occurs against the force of gravity. By using a low pressure environmental scanning electron microscope (ESEM), the water condensation and evaporation process on the leaves has been observed. The leaf surfaces are composed of five different cell types: conical cells, glands, multicellular hairs, hair-papilla cells and longitudinal expanded, flat epidermis cells, which, in combination with the surrounding papilla cells, form channel like structures. Replication of the leaf surface structure and coating of the replicas with hydrophilic Tween 20 and a water soluble extract gained from the leaf surfaces resulted in artificial surfaces with the same fast water spreading properties as described for the leaves.
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Affiliation(s)
- Kerstin Koch
- Nees Institut für Biodiversität der Pflanzen, Meckenheimer Allee 170, 53115 Bonn, Germany
| | - Inga Christina Blecher
- Nees Institut für Biodiversität der Pflanzen, Meckenheimer Allee 170, 53115 Bonn, Germany
| | - Gabriele König
- Institut für Pharmazeutische Biologie, Nußallee 6, 53115 Bonn, Germany
| | - Stefan Kehraus
- Institut für Pharmazeutische Biologie, Nußallee 6, 53115 Bonn, Germany
| | - Wilhelm Barthlott
- Nees Institut für Biodiversität der Pflanzen, Meckenheimer Allee 170, 53115 Bonn, Germany
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16
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Xu Y, Bakker E. Ion channel mimetic chronopotentiometric polymeric membrane ion sensor for surface-confined protein detection. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:568-573. [PMID: 19067579 PMCID: PMC2664528 DOI: 10.1021/la802728p] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The operation of ion channel sensors is mimicked with functionalized polymeric membrane electrodes, using a surface confined affinity reaction to impede the electrochemically imposed ion transfer kinetics of a marker ion. A membrane surface biotinylated by covalent attachment to the polymeric backbone is used here to bind to the protein avidin as a model system. The results indicate that the protein accumulates on the ion-selective membrane surface, partially blocking the current-induced ion transfer across the membrane/aqueous sample interface, and subsequently decreases the potential jump in the so-called super-Nernstian step that is characteristic of a surface depletion of the marker ion. The findings suggest that such a potential drop could be utilized to measure the concentration of protein in the sample. Because the sensitivity of protein sensing is dependent on the effective blocking of the active surface area, it can be improved with a hydrophilic nanopore membrane applied on top of the biotinylated ion-selective membrane surface. On the basis of cyclic voltammetry characterization, the nanoporous membrane electrodes can indeed be understood as a recessed nanoelectrode array. The results show that the measuring range for protein sensing on nanopore electrodes is shifted to lower concentrations by more than 1 order of magnitude, which is explained with the reduction of surface area by the nanopore membrane and the related more effective hemispherical diffusion pattern.
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Affiliation(s)
- Yida Xu
- Department of Chemistry, Purdue University, Indiana 47907, USA
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17
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Wu MH. Simple poly(dimethylsiloxane) surface modification to control cell adhesion. SURF INTERFACE ANAL 2009. [DOI: 10.1002/sia.2964] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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18
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Abstract
The major challenges in formulation development for hydrophobic proteins are low solubility often combined with a strong tendency for adsorption. Human serum albumin (HSA) is frequently used as excipient to overcome these problems. Due to several drawbacks with HSA, new ways need to be found to circumvent the use of this excipient in protein formulations. One possible approach is to select an appropriate formulation pH and ionic strength in combination with excipients that provide sufficient stability and solubility for the hydrophobic protein. A reduction in adsorption can be achieved by adding surfactants or using special containers.
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Affiliation(s)
- Andrea Hawe
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University of Munich, Munich, Germany.
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19
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An investigation of vibration-induced protein desorption mechanism using a micromachined membrane and PZT plate. Biomed Microdevices 2008; 10:701-8. [DOI: 10.1007/s10544-008-9181-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Hawe A, Friess W. Development of HSA-free formulations for a hydrophobic cytokine with improved stability. Eur J Pharm Biopharm 2007; 68:169-82. [PMID: 17574398 DOI: 10.1016/j.ejpb.2007.04.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2007] [Revised: 04/26/2007] [Accepted: 04/26/2007] [Indexed: 10/23/2022]
Abstract
The goal was to characterize a hydrophobic cytokine with respect to oxidation and aggregation, as well as its adsorption to the container at different pH and ionic strength conditions. The tendency of the cytokine to adsorb on surfaces and its low solubility at physiological pH were the main challenges during the development of HSA-free formulations for the cytokine. When the formulation pH exceeded 5.5 precipitation led to significantly higher turbidity. This turbidity increase and elevated aggregation as determined by HP-SEC and DLS was more pronounced at higher glycine and NaCl concentrations. With rising pH protein adsorption was more distinct compared to pH 3.0. However, protein adsorption could be minimized by polysorbate 20 or the use of glass type I(+). FTIR revealed a reduced thermal stability at higher pH values indicated by a declining denaturation temperature. Five liquid formulations in the pH range 3.5-4.5 and five lyophilized formulations at pH 4.0-5.0 were stored for 6 months and the stability was evaluated with respect to aggregation and chemical modification. Liquid formulations at pH 3.5-4.0 and lyophilized formulations at pH 4.0-5.0 were most stable during 6 months at 2-8 degrees C.
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Affiliation(s)
- Andrea Hawe
- Ludwig-Maximilians-University Munich, Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Munich, Germany.
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21
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Togashi DM, Ryder AG. Fluorescence lifetime imaging study of a thin protein layer on solid surfaces. Exp Mol Pathol 2007; 82:135-41. [PMID: 17336293 DOI: 10.1016/j.yexmp.2007.01.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2006] [Revised: 01/04/2007] [Accepted: 01/08/2007] [Indexed: 10/23/2022]
Abstract
Understanding the fundamental interactions between proteins and solid surfaces is essential in the area of implantable medical devices. Fluorescence methods offer the sensitivity required to study the formation of the initial thin protein layers that mediate biocompatibility of materials. Thin protein layers (bovine serum albumin labelled with 1-anilino-8-naphthalenesulfonate, BSA-ANS) deposited on several surfaces (glass, silicon, stainless steel, polystyrene, and silver island film) were studied using confocal frequency domain Fluorescence Lifetime Imaging Microscopy (FLIM) and single-point multifrequency lifetime analysis techniques. FLIM provides spatial information about both fluorophores located on the surface and physicochemical parameters of the surface microenvironment. The average fluorescence lifetimes (tau(av)) of the adsorbed BSA-ANS generated by the contact between a protein solution and the material surface were measured by the multifrequency modulation and phase shift. Results indicate that tau(av) values of the albumin complexes on the surfaces (approximately 12 ns) are, in general, shorter than tau(av) found in the bulk solution (approximately 14 ns). For some surfaces, like polystyrene and silver island film the differences in tau(av) of the adsorbed BSA-ANS were found to be much greater. The differences in fluorescence lifetimes may indicate structural changes in the BSA protein induced by contact with the surface.
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Affiliation(s)
- Denisio M Togashi
- Nanoscale Biophotonics Laboratory, Department of Chemistry, National University of Ireland, Galway, Ireland.
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22
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Hawkins KR, Steedman MR, Baldwin RR, Fu E, Ghosal S, Yager P. A method for characterizing adsorption of flowing solutes to microfluidic device surfaces. LAB ON A CHIP 2007; 7:281-5. [PMID: 17268632 DOI: 10.1039/b612894g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We present a method for characterizing the adsorption of solutes in microfluidic devices that is sensitive to both long-lived and transient adsorption and can be applied to a variety of realistic device materials, designs, fabrication methods, and operational parameters. We have characterized the adsorption of two highly adsorbing molecules (FITC-labeled bovine serum albumin (BSA) and rhodamine B) and compared these results to two low adsorbing species of similar molecular weights (FITC-labeled dextran and fluorescein). We have also validated our method by demonstrating that two well-known non-fouling strategies [deposition of the polyethylene oxide (PEO)-like surface coating created by radio-frequency glow discharge plasma deposition (RF-GDPD) of tetraethylene glycol dimethyl ether (tetraglyme, CH(3)O(CH(2)CH(2)O)(4)CH(3)), and blocking with unlabeled BSA] eliminate the characteristic BSA adsorption behavior observed otherwise.
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Affiliation(s)
- Kenneth R Hawkins
- Department of Bioengineering, University of Washington, Seattle, WA, USA.
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Chapter 3 Surface Plasmon Optics for the Characterization of Biofunctional Architectures. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/s1573-4285(06)14003-x] [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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Boxshall K, Wu MH, Cui Z, Cui Z, Watts JF, Baker MA. Simple surface treatments to modify protein adsorption and cell attachment properties within a poly(dimethylsiloxane) micro-bioreactor. SURF INTERFACE ANAL 2006. [DOI: 10.1002/sia.2274] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Mollmann SH, Elofsson U, Bukrinsky JT, Frokjaer S. Displacement of adsorbed insulin by Tween 80 monitored using total internal reflection fluorescence and ellipsometry. Pharm Res 2005; 22:1931-41. [PMID: 16088428 DOI: 10.1007/s11095-005-7249-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2005] [Accepted: 07/06/2005] [Indexed: 11/27/2022]
Abstract
PURPOSE This study was conducted to investigate the mechanism of action in the displacement of adsorbed insulin from a hydrophobic surface by Tween 80 and of the competitive adsorption of the two species. METHODS Total internal reflection fluorescence (TIRF) and ellipsometry were used as in situ methods to examine the processes taking place at hydrophobic model surfaces in the presence of insulin and Tween 80. RESULTS TIRF studies showed that the displacement of insulin by Tween 80 could be fitted to a sigmoidal function, indicating a nucleation-dependent process. Furthermore, a linear dependence between the apparent rate constant and the logarithm of the Tween 80 concentration was found. Competitive adsorption from solution mixtures of insulin and Tween 80 indicated that insulin was adsorbed first, but subsequently displaced by the surfactant. This displacement proved also to be dependent on the concentration of Tween 80 in the mixture. CONCLUSIONS The results indicate that Tween 80 at concentrations above critical micelle concentration can be used to protect insulin against surface adsorption. The presence of a lag phase in the displacement at low surfactant concentration indicates that the mechanism of action for Tween 80 to reduce adsorption of insulin may be by competing for sites at the surface.
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Affiliation(s)
- S H Mollmann
- Department of Pharmaceutics, The Danish University of Pharmaceutical Sciences, DK-2100 Copenhagen, Denmark.
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Cao S, Liu B, Deng X, Li S. Core/Shell Particles Containing 3-(Methacryloxypropyl)-Trimethoxysilane in the Shell: Synthesis, Characterization, and Application. Macromol Biosci 2005; 5:669-76. [PMID: 16010694 DOI: 10.1002/mabi.200500011] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In comparison to the corresponding single-component counterparts, core/shell particles are widely used due to their better physical and chemical properties. The surface properties of core/shell particles evidently play an important role in the process of application. It is easy to deduce that surface properties mostly depend on the properties of the component in the shell. Therefore, desirable materials of shell are very significant for the study of composite materials, especially in core/shell field. It is well known that polysiloxane has excellent properties, such as the water repellency, high flexibility, low surface energy, and biocompatibility. Its application, however, is limited due to poor cohesiveness and poor film-forming properties. Recently, much endeavor has been made to overcome such flaws. It is found that polyacrylate is commonly considered for its good cohesiveness and excellent film-forming property. The combination of polysiloxane and polyacrylate has been shown to be important in the composite material field, especially as core/shell particles. Unfortunately, their hydrophobicity is considerably different and thus, the core/shell particles consisting of polyacrylate (PA)/polysiloxane (PSi) are hard to prepare by general seeded emulsion polymerization, and are also scarcely available in the literature. In this study, the new core/shell PA/PSi particles with poly(butyl methacrylate) (PA) as the core and poly(3-(methacryloxypropyl)-trimethoxysilane) (PSi) as the shell were prepared by dispersion polymerization under the kinetically controlled conditions. The characterization of the particles by TEM, DSC, particle size analyzer as well as static contact angle confirmed the formation of core/shell structure. The application of core/shell (PA/PSi) particles also has been considered and discussed here.TEM micrographs of core/shell (PA/PSi) particles.
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Affiliation(s)
- Shunsheng Cao
- Chengdu Institute of Organic Chemistry, The Graduate School of CAS, Chinese Academy of Sciences, Chengdu 610041, P. R. China
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Huang T, Geng T, Sturgis J, Li H, Gomez R, Bashir R, Bhunia AK, Robinson J, Ladisch MR. Lysozyme for capture of microorganisms on protein biochips. Enzyme Microb Technol 2003. [DOI: 10.1016/j.enzmictec.2003.07.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Huang TT, Sturgis J, Gomez R, Geng T, Bashir R, Bhunia AK, Robinson JP, Ladisch MR. Composite surface for blocking bacterial adsorption on protein biochips. Biotechnol Bioeng 2003; 81:618-24. [PMID: 12514811 DOI: 10.1002/bit.10507] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The design and fabrication of protein biochips requires characterization of blocking agents that minimize nonspecific binding of proteins or organisms. Nonspecific adsorption of Escherichia coli, Listeria innocua, and Listeria monocytogenes is prevented by bovine serum albumin (BSA) or biotinylated BSA adsorbed on SiO(2) surfaces of a biochip that had been modified with a C(18) coating. Biotinylated BSA forms a protein-based surface that in turn binds streptavidin. Because streptavidin has multiple binding sites for biotin, it in turn anchors other biotinylated proteins, including antibodies. Hence, biotinylated BSA simultaneously serves as a blocking agent and a foundation for binding an interfacing protein, avidin or streptavidin, which in turns anchors biotinylated antibody. In our case, the antibody is C11E9, an IgG-type antibody that binds Listeria spp. Nonspecific adsorption of another bacterium, Escherichia coli, is also minimized due to the blocking action of the BSA. The blocking characteristics of BSA adsorbed on C(18)-derivatized SiO(2) surfaces for construction of a protein biochip for electronic detection of pathogenic organisms is investigated.
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Affiliation(s)
- Tom T Huang
- School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
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