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Sundar S, Nirmal G, Borkar S, Goel S, Ramachandran K, Kochhar R, Hukkanen EJ, Chiarella RA, Ramachandran A. Microfluidic extensional flow device to study mass transfer dynamics in the polymer microparticle formation process. SOFT MATTER 2024; 20:6140-6149. [PMID: 39041251 DOI: 10.1039/d4sm00492b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
Polymer microparticles are often used to encapsulate drugs for sustained drug-release treatments. One of the ways they are manufactured is by using a solvent extraction process, in which the polymer solution is emulsified into an aqueous bulk phase using a surfactant as a stabilizing agent, followed by the removal of the solvent. The radius of a polymer drop decreases as a function of time until the polymer reaches the gelling point, after which it is separated and dried. Among the various operating parameters, the rate of solvent extraction is a critical step that affects the morphology and porosity, and consequently, the kinetics of drug release. But a fundamental mechanistic understanding of the solvent extraction dynamics as a function of shear is still unexplored. In this study, we have developed an experimental mass transfer model to predict the extraction by using the microfluidic extensional flow device (MEFD) to probe the shear and extraction dynamics at the level of a single drop in a linear extensional flow field. We used a computer-controlled feedback algorithm to manipulate the flow field and hydrodynamically trap a Hele-Shaw drop and observe the extraction process. For the polymer solution, we used a biocompatible polymer, poly-lactic-co-glycolic acid (PLGA) with ethyl acetate (EtOAc) as the solvent. Our experiments were conducted by varying the extensional rate (G) in the channel from ∼0.1 s-1 to ∼10 s-1, and using an analytical solution of the flow field, we captured the dissolution process and measured the change in drop radius (R) with time (t). Interestingly, we initially observed a short-time asymptote R ∼ t, and later the long-time asymptote of R = constant; both trends were physically explained. The transport model developed in this work can be used to predict extraction rates and polymer microparticle composition for any polymer-solvent system. This work is also an important contribution to the literature on convective mass transfer in partially miscible emulsions.
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Affiliation(s)
- Suryavarshini Sundar
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S 3E5, Canada.
| | - Ghata Nirmal
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S 3E5, Canada.
| | - Suraj Borkar
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S 3E5, Canada.
| | - Sachin Goel
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S 3E5, Canada.
| | - Karthik Ramachandran
- Pharmaceutical Development, Alkermes, Inc., 900 Winter St, Waltham, MA 02451, USA
| | - Ransom Kochhar
- Pharmaceutical Development, Alkermes, Inc., 900 Winter St, Waltham, MA 02451, USA
| | - Eric J Hukkanen
- Pharmaceutical Development, Alkermes, Inc., 900 Winter St, Waltham, MA 02451, USA
| | - Renato A Chiarella
- Pharmaceutical Development, Alkermes, Inc., 900 Winter St, Waltham, MA 02451, USA
| | - Arun Ramachandran
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S 3E5, Canada.
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Chandrababu KB, Kannan A, Savage JR, Stadmiller S, Ryle AE, Cheung C, Kelley RF, Maa YF, Saggu M, Bitterfield DL. Stability Comparison Between Microglassification and Lyophilization Using a Monoclonal Antibody. J Pharm Sci 2024; 113:1054-1060. [PMID: 37863428 DOI: 10.1016/j.xphs.2023.10.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 10/13/2023] [Accepted: 10/13/2023] [Indexed: 10/22/2023]
Abstract
Producing solid-state formulations of biologics remains a daunting task despite the prevalent use of lyophilization and spray drying technologies in the biopharmaceutical industry. The challenges include protein stability (temperature stresses), high capital costs, particle design/controllability, shortened processing times and manufacturing considerations (scalability, yield improvements, aseptic operation, etc.). Thus, scientists/engineers are constantly working to improve existing methodologies and exploring novel dehydration/powder-forming technologies. Microglassification™ is a dehydration technology that uses solvent extraction to rapidly dehydrate protein formulations at ambient temperatures, eliminating the temperature stress experienced by biologics in traditional lyophilization and spray drying methods. The process results in microparticles that are spherical, dense, and chemically stable. In this study, we compared the molecular stability of a monoclonal antibody formulation processed by lyophilization to the same formulation processed using Microglassification™. Both powders were placed on stability for 3 months at 40 °C and 6 months at 25 °C. Both dehydration methods showed similar chemical stability, including percent monomer, charge variants, and antigen binding. These results show that Microglassification™ is viable for the production of stable solid-state monoclonal antibody formulations.
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Affiliation(s)
| | - Aadithya Kannan
- Pharmaceutical Development, Genentech Inc., South San Francisco, CA 94080, United States
| | - John R Savage
- Lindy Biosciences, 627 Davis Dr. #400 Morrisville, North Carolina 27560, United States
| | - Samantha Stadmiller
- Lindy Biosciences, 627 Davis Dr. #400 Morrisville, North Carolina 27560, United States
| | - Adam E Ryle
- Lindy Biosciences, 627 Davis Dr. #400 Morrisville, North Carolina 27560, United States
| | - Chloe Cheung
- Pharmaceutical Development, Genentech Inc., South San Francisco, CA 94080, United States
| | - Robert F Kelley
- Pharmaceutical Development, Genentech Inc., South San Francisco, CA 94080, United States
| | - Yuh-Fun Maa
- Pharmaceutical Development, Genentech Inc., South San Francisco, CA 94080, United States
| | - Miguel Saggu
- Pharmaceutical Development, Genentech Inc., South San Francisco, CA 94080, United States.
| | - Deborah L Bitterfield
- Lindy Biosciences, 627 Davis Dr. #400 Morrisville, North Carolina 27560, United States.
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Sharma A, Khamar D, Cullen S, Hayden A, Hughes H. Innovative Drying Technologies for Biopharmaceuticals. Int J Pharm 2021; 609:121115. [PMID: 34547393 DOI: 10.1016/j.ijpharm.2021.121115] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 08/24/2021] [Accepted: 09/15/2021] [Indexed: 01/30/2023]
Abstract
In the past two decades, biopharmaceuticals have been a breakthrough in improving the quality of lives of patients with various cancers, autoimmune, genetic disorders etc. With the growing demand of biopharmaceuticals, the need for reducing manufacturing costs is essential without compromising on the safety, quality, and efficacy of products. Batch Freeze-drying is the primary commercial means of manufacturing solid biopharmaceuticals. However, Freeze-drying is an economically unfriendly means of production with long production cycles, high energy consumption and heavy capital investment, resulting in high overall costs. This review compiles some potential, innovative drying technologies that have not gained popularity for manufacturing parenteral biopharmaceuticals. Some of these technologies such as Spin-freeze-drying, Spray-drying, Lynfinity® Technology etc. offer a paradigm shift towards continuous manufacturing, whereas PRINT® Technology and MicroglassificationTM allow controlled dry particle characteristics. Also, some of these drying technologies can be easily scaled-up with reduced requirement for different validation processes. The inclusion of Process Analytical Technology (PAT) and offline characterization techniques in tandem can provide additional information on the Critical Process Parameters (CPPs) and Critical Quality Attributes (CQAs) during biopharmaceutical processing. These processing technologies can be envisaged to increase the manufacturing capacity for biopharmaceutical products at reduced costs.
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Affiliation(s)
- Ashutosh Sharma
- Pharmaceutical and Molecular Biotechnology Research Centre (PMBRC), Waterford Institute of Technology, Main Campus, Cork Road, Waterford X91K0EK, Ireland.
| | - Dikshitkumar Khamar
- Sanofi, Manufacturing Science, Analytics and Technology (MSAT), IDA Industrial Park, Waterford X91TP27, Ireland
| | - Sean Cullen
- Gilead Sciences, Commercial Manufacturing, IDA Business & Technology Park, Carrigtwohill, Co. Cork T45DP77, Ireland
| | - Ambrose Hayden
- Pharmaceutical and Molecular Biotechnology Research Centre (PMBRC), Waterford Institute of Technology, Main Campus, Cork Road, Waterford X91K0EK, Ireland
| | - Helen Hughes
- Pharmaceutical and Molecular Biotechnology Research Centre (PMBRC), Waterford Institute of Technology, Main Campus, Cork Road, Waterford X91K0EK, Ireland
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Pham VN, Radajewski D, Rodríguez-Ruiz I, Teychene S. Microfluidics: A Novel Approach for Dehydration Protein Droplets. BIOSENSORS 2021; 11:bios11110460. [PMID: 34821675 PMCID: PMC8615364 DOI: 10.3390/bios11110460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 11/10/2021] [Accepted: 11/15/2021] [Indexed: 11/16/2022]
Abstract
The equation of state of colloids plays an important role in the modelling and comprehension of industrial processes, defining the working conditions of processes such as drying, filtration, and mixing. The determination of the equation is based on the solvent equilibration, by dialysis, between the colloidal suspension and a reservoir with a known osmotic pressure. In this paper, we propose a novel microfluidic approach to determine the equation of state of a lysozyme solution. Monodispersed droplets of lysozyme were generated in the bulk of a continuous 1-decanol phase using a flow-focusing microfluidic geometry. In this multiphasic system and in the working operation conditions, the droplets can be considered to act as a permeable membrane system. A water mass transfer flow occurs by molecule continuous diffusion in the surrounding 1-decanol phase until a thermodynamic equilibrium is reached in a few seconds to minutes, in contrast with the standard osmotic pressure measurements. By changing the water saturation of the continuous phase, the equation of state of lysozyme in solution was determined through the relation of the osmotic pressure between protein molecules and the volume fraction of protein inside the droplets. The obtained equation shows good agreement with other standard approaches reported in the literature.
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Affiliation(s)
- Van Nhat Pham
- Graduate University of Science and Technology (GUST), Vietnam Academy of Science and Technology, Hanoi 10072, Vietnam;
- Department of Advanced Materials Science and Nanotechnology, Vietnam Academy of Science and Technology, University of Science and Technology of Hanoi (USTH), Hanoi 10072, Vietnam
| | - Dimitri Radajewski
- Laboratoire de Génie Chimique, UMR 5503, 4 allée Emile Monso, 31432 Toulouse, France; (D.R.); (I.R.-R.)
| | - Isaac Rodríguez-Ruiz
- Laboratoire de Génie Chimique, UMR 5503, 4 allée Emile Monso, 31432 Toulouse, France; (D.R.); (I.R.-R.)
| | - Sebastien Teychene
- Laboratoire de Génie Chimique, UMR 5503, 4 allée Emile Monso, 31432 Toulouse, France; (D.R.); (I.R.-R.)
- Correspondence:
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Park SK, Noh GY, Yu HW, Lee EC, Jeong J, Park YM, Han HK, Jeong SH, Kim NA. Lessons Learned in Protein Precipitation Using a Membrane Emulsification Technique to Produce Reversible and Uniform Microbeads. Pharmaceutics 2021; 13:pharmaceutics13101738. [PMID: 34684031 PMCID: PMC8540039 DOI: 10.3390/pharmaceutics13101738] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 10/08/2021] [Accepted: 10/16/2021] [Indexed: 11/16/2022] Open
Abstract
The effects of the manufacturing process and the regeneration of Shirasu porous glass (SPG) membranes were investigated on the reproducibility of protein precipitants, termed protein microbeads. Intravenous immunoglobulin (IVIG) was selected as a model protein to produce its microbeads in seven different cases. The results showed that the hydrophobically modified SPG membrane produced finer microbeads than the hydrophilic SPG membrane, but this was inconsistent when using the general regeneration method. Its reproducibility was determined to be mostly dependent on rinsing the SPG membrane prior to the modification and on the protein concentration used for emulsification. The higher concentration could foul and plug the membrane during protein release and thus the membrane must be washed thoroughly before hydrophobic modification. Moreover, the membrane regenerated by silicone resin dissolved in ethanol had better reproducibility than silicone resin dissolved in water. On the other hand, rinsing the protein precipitant with cold ethanol after the emulsification was not favorable and induced protein aggregation. With the addition of trehalose, the purity of the IVIG microbeads was almost the same as before microbeadification. Therefore, the regeneration method, protein concentration, and its stabilizer are key to the success of protein emulsification and precipitation using the SPG membrane.
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Affiliation(s)
- Sang-Koo Park
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Korea; (S.-K.P.); (G.Y.N.); (H.W.Y.); (E.C.L.); (J.J.); (H.-K.H.)
| | - Ga Yeon Noh
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Korea; (S.-K.P.); (G.Y.N.); (H.W.Y.); (E.C.L.); (J.J.); (H.-K.H.)
| | - Hyun Woo Yu
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Korea; (S.-K.P.); (G.Y.N.); (H.W.Y.); (E.C.L.); (J.J.); (H.-K.H.)
| | - Eun Chae Lee
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Korea; (S.-K.P.); (G.Y.N.); (H.W.Y.); (E.C.L.); (J.J.); (H.-K.H.)
| | - Junoh Jeong
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Korea; (S.-K.P.); (G.Y.N.); (H.W.Y.); (E.C.L.); (J.J.); (H.-K.H.)
| | - Young-Min Park
- Division of Health and Kinesiology, Incheon National University, Incheon 22012, Korea;
| | - Hyo-Kyung Han
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Korea; (S.-K.P.); (G.Y.N.); (H.W.Y.); (E.C.L.); (J.J.); (H.-K.H.)
| | - Seong Hoon Jeong
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Korea; (S.-K.P.); (G.Y.N.); (H.W.Y.); (E.C.L.); (J.J.); (H.-K.H.)
- Correspondence: (S.H.J.); (N.A.K.); Tel.: +82-10-5679-0621 (S.H.J.); +82-10-5590-1018 (N.A.K.)
| | - Nam Ah Kim
- BK21 FOUR Team and Integrated Research Institute for Drug Development, College of Pharmacy, Dongguk University, Seoul 10326, Korea; (S.-K.P.); (G.Y.N.); (H.W.Y.); (E.C.L.); (J.J.); (H.-K.H.)
- Correspondence: (S.H.J.); (N.A.K.); Tel.: +82-10-5679-0621 (S.H.J.); +82-10-5590-1018 (N.A.K.)
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6
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Kim NA, Yu HW, Noh GY, Park SK, Kang W, Jeong SH. Protein microbeadification to achieve highly concentrated protein formulation with reversible properties and in vivo pharmacokinetics after reconstitution. Int J Biol Macromol 2021; 185:935-948. [PMID: 34237365 DOI: 10.1016/j.ijbiomac.2021.07.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 07/01/2021] [Accepted: 07/02/2021] [Indexed: 10/20/2022]
Abstract
A protein precipitation technique was optimized to produce biophysically stable 'protein microbeads', applicable to highly concentrated protein formulation. Initially, production of BSA microbeads was performed using rapid dehydration by vortexing in organic solvents followed by cold ethanol treatment and a vacuum drying. Out of four solvents, n-octanol produced the most reversible microbeads upon reconstitution. A Shirasu porous glass (SPG) membrane emulsification technique was utilized to enhance the size distribution and manufacturing process of the protein microbeads with a marketized human IgG solution. Process variants such as dehydration time, temperature, excipients, drying conditions, and initial protein concentration were evaluated in terms of the quality of IgG microbeads and their reversibility. The hydrophobized SPG membrane produced a narrow size distribution of the microbeads, which were further enhanced by shorter dehydration time, low temperature, minimized the residual solvents, lower initial protein concentration, and addition of trehalose to the IgG solution. Final reversibility of the IgG microbeads with trehalose was over 99% at both low and high protein concentrations. Moreover, the formulation was highly stable under repeated mechanical shocks and at an elevated temperature compared to its liquid state. Its in vivo pharmacokinetic profiles in rats were consistent before and after the 'microbeadification'.
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Affiliation(s)
- Nam Ah Kim
- College of Pharmacy, Dongguk University-Seoul, Gyeonggi 13026, Republic of Korea.
| | - Hyun Woo Yu
- College of Pharmacy, Dongguk University-Seoul, Gyeonggi 13026, Republic of Korea
| | - Ga Yeon Noh
- College of Pharmacy, Dongguk University-Seoul, Gyeonggi 13026, Republic of Korea
| | - Sang-Koo Park
- College of Pharmacy, Dongguk University-Seoul, Gyeonggi 13026, Republic of Korea
| | - Wonku Kang
- College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Seong Hoon Jeong
- College of Pharmacy, Dongguk University-Seoul, Gyeonggi 13026, Republic of Korea.
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Nguyen TV, Pham NV, Mai HH, Duong DC, Le HH, Sapienza R, Ta VD. Protein-based microsphere biolasers fabricated by dehydration. SOFT MATTER 2019; 15:9721-9726. [PMID: 31742302 DOI: 10.1039/c9sm01610d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Biolasers made of biological materials have attracted considerable research attention due to their biocompatibility and biodegradability, and have the potential for biosensing and biointegration. However, the current fabrication methods of biolasers suffer from several limitations, such as complicated processing, time-consuming and environmentally unfriendly nature. In this study, a novel approach with green processes for fabricating solid-state microsphere biolasers has been demonstrated. By dehydration via a modified Microglassification™ technology, dye-doped bovine serum albumin (BSA) droplets could be quickly (less than 10 minutes) and easily changed into solid microspheres with diameters ranging from 10 μm to 150 μm. The size of the microspheres could be effectively controlled by changing either the concentration of the BSA solution or the diameter of the initial droplets. The fabricated microspheres could act as efficient microlasers under an optical pulse excitation. A lasing threshold of 7.8 μJ mm-2 and a quality (Q) factor of about 1700 to 3100 were obtained. The size dependence of lasing characteristics was investigated, and the results showed a good agreement with whispering gallery mode (WGM) theory. Our findings contribute an effective technique for the fabrication of high-Q factor microlasers that may be potential for applications in biological and chemical sensors.
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Affiliation(s)
- Toan Van Nguyen
- Department of Physics, Le Quy Don Technical University, Hanoi 100000, Vietnam
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Abstract
Diffusional motion within the crowded environment of the cell is known to be crucial to cellular function as it drives the interactions of proteins. However, the relationships between protein diffusion, shape and interaction, and the evolutionary selection mechanisms that arise as a consequence, have not been investigated. Here, we study the dynamics of triaxial ellipsoids of equivalent steric volume to proteins at different aspect ratios and volume fractions using a combination of Brownian molecular dynamics and geometric packing. In general, proteins are found to have a shape, approximately Golden in aspect ratio, that give rise to the highest critical volume fraction resisting gelation, corresponding to the fastest long-time self-diffusion in the cell. The ellipsoidal shape also directs random collisions between proteins away from sites that would promote aggregation and loss of function to more rapidly evolving nonsticky regions on the surface, and further provides a greater tolerance to mutation.
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Micro-Surface and -Interfacial Tensions Measured Using the Micropipette Technique: Applications in Ultrasound-Microbubbles, Oil-Recovery, Lung-Surfactants, Nanoprecipitation, and Microfluidics. MICROMACHINES 2019; 10:mi10020105. [PMID: 30717224 PMCID: PMC6413238 DOI: 10.3390/mi10020105] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 01/23/2019] [Accepted: 01/25/2019] [Indexed: 01/08/2023]
Abstract
This review presents a series of measurements of the surface and interfacial tensions we have been able to make using the micropipette technique. These include: equilibrium tensions at the air-water surface and oil-water interface, as well as equilibrium and dynamic adsorption of water-soluble surfactants and water-insoluble and lipids. At its essence, the micropipette technique is one of capillary-action, glass-wetting, and applied pressure. A micropipette, as a parallel or tapered shaft, is mounted horizontally in a microchamber and viewed in an inverted microscope. When filled with air or oil, and inserted into an aqueous-filled chamber, the position of the surface or interface meniscus is controlled by applied micropipette pressure. The position and hence radius of curvature of the meniscus can be moved in a controlled fashion from dimensions associated with the capillary tip (~5–10 μm), to back down the micropipette that can taper out to 450 μm. All measurements are therefore actually made at the microscale. Following the Young–Laplace equation and geometry of the capillary, the surface or interfacial tension value is simply obtained from the radius of the meniscus in the tapered pipette and the applied pressure to keep it there. Motivated by Franklin’s early experiments that demonstrated molecularity and monolayer formation, we also give a brief potted-historical perspective that includes fundamental surfactancy driven by margarine, the first use of a micropipette to circuitously measure bilayer membrane tensions and free energies of formation, and its basis for revolutionising the study and applications of membrane ion-channels in Droplet Interface Bilayers. Finally, we give five examples of where our measurements have had an impact on applications in micro-surfaces and microfluidics, including gas microbubbles for ultrasound contrast; interfacial tensions for micro-oil droplets in oil recovery; surface tensions and tensions-in-the surface for natural and synthetic lung surfactants; interfacial tension in nanoprecipitation; and micro-surface tensions in microfluidics.
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Boire A, Renard D, Bouchoux A, Pezennec S, Croguennec T, Lechevalier V, Le Floch-Fouéré C, Bouhallab S, Menut P. Soft-Matter Approaches for Controlling Food Protein Interactions and Assembly. Annu Rev Food Sci Technol 2019; 10:521-539. [PMID: 30633568 DOI: 10.1146/annurev-food-032818-121907] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Animal- and plant-based proteins are present in a wide variety of raw and processed foods. They play an important role in determining the final structure of food matrices. Food proteins are diverse in terms of their biological origin, molecular structure, and supramolecular assembly. This diversity has led to segmented experimental studies that typically focus on one or two proteins but hinder a more general understanding of food protein structuring as a whole. In this review, we propose a unified view of how soft-matter physics can be used to control food protein assembly. We discuss physical models from polymer and colloidal science that best describe and predict the phase behavior of proteins. We explore the occurrence of phase transitions along two axes: increasing protein concentration and increasing molecular attraction. This review provides new perspectives on the link between the interactions, phase transitions, and assembly of proteins that can help in designing new food products and innovative food processing operations.
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Affiliation(s)
- Adeline Boire
- Biopolymères Interactions Assemblages, INRA UR1268, F-44300 Nantes, France;
| | - Denis Renard
- Biopolymères Interactions Assemblages, INRA UR1268, F-44300 Nantes, France;
| | - Antoine Bouchoux
- LISBP, Université de Toulouse, CNRS, INRA, INSA, F-31077 Toulouse, France
| | | | | | | | | | - Saïd Bouhallab
- STLO, INRA UMR1253, Agrocampus Ouest, F-35042 Rennes, France
| | - Paul Menut
- Montpellier SupAgro, 34060 Montpellier, France; .,Ingénierie Procédés Aliments, AgroParisTech, INRA, Université Paris-Saclay, 91300 Massy, France
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11
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Julius K, Weine J, Berghaus M, König N, Gao M, Latarius J, Paulus M, Schroer MA, Tolan M, Winter R. Water-Mediated Protein-Protein Interactions at High Pressures are Controlled by a Deep-Sea Osmolyte. PHYSICAL REVIEW LETTERS 2018; 121:038101. [PMID: 30085800 DOI: 10.1103/physrevlett.121.038101] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Indexed: 06/08/2023]
Abstract
The influence of natural cosolvent mixtures on the pressure-dependent structure and protein-protein interaction potential of dense protein solutions is studied and analyzed using small-angle X-ray scattering in combination with a liquid-state theoretical approach. The deep-sea osmolyte trimethylamine-N-oxide is shown to play a crucial and singular role in its ability to not only guarantee sustainability of the native protein's folded state under harsh environmental conditions, but it also controls water-mediated intermolecular interactions at high pressure, thereby preventing contact formation and hence aggregation of proteins.
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Affiliation(s)
- Karin Julius
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Jonathan Weine
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Melanie Berghaus
- Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany
| | - Nico König
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Mimi Gao
- Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany
| | - Jan Latarius
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Michael Paulus
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Martin A Schroer
- European Molecular Biology Laboratory (EMBL) Hamburg c/o DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - Metin Tolan
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Roland Winter
- Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany
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12
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de Vries A, Jansen D, van der Linden E, Scholten E. Tuning the rheological properties of protein-based oleogels by water addition and heat treatment. Food Hydrocoll 2018. [DOI: 10.1016/j.foodhyd.2017.11.043] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Utoft A, Kinoshita K, Bitterfield DL, Needham D. Manipulating Single Microdroplets of NaCl Solutions: Solvent Dissolution, Microcrystallization, and Crystal Morphology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3626-3641. [PMID: 29510057 DOI: 10.1021/acs.langmuir.7b03977] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A new "three-micropipette manipulation technique" for forming, dehydrating, crystallizing, and resolvating nanograms of salt material has been developed to study supersaturated single microdroplets and microcrystals. This is the first report of studies that have measured in situ both supersaturation (as homogeneous nucleation) and saturation (as microcrystal redissolution) for single microdroplets of NaCl solution using the micropipette technique. This work reports a measure of the critical supersaturation concentration for homogeneous nucleation of NaCl (10.3 ± 0.3 M) at a supersaturation fraction of S = 1.9, the saturation concentration of NaCl in aqueous solution as measured with nanograms of material (5.5 ± 0.1 M), the diffusion coefficient for water in octanol, D = (1.96 ± 0.10) × 10-6 cm2/s, and the effect of the solvent's activity on dissolution kinetics. It is further shown that the same Epstein-Plesset (EP) model, which was originally developed for diffusion-controlled dissolution and uptake of gas, and successfully applied to liquid-in-liquid dissolution, can now also be applied to describe the diffusion-controlled uptake of water from a water-saturated environment using the extended activity-based model of Bitterfield et al. This aspect of the EP model has not previously been tested using single microdroplets. Finally, it is also reported how the water dissolution rate, rate of NaCl concentration change, resulting crystal structure, and the time frame of initial crystal growth are affected by changing the bathing medium from octanol to decane. A much slower loss of water-solvent and concomitant slower up-concentration of the NaCl solute resulted in a lower tendency to nucleate and slower crystal growth because much less excess material was available at the onset of nucleation in the decane system as compared to the octanol system. Thus, the crystal structure is reported to be dendritic for NaCl solution microdroplets dissolving rapidly and nucleating violently in octanol, while they are formed as single cubic crystals in a gentler way for solution-dissolution in decane. These new techniques and analyses can now also be used for any other system where all relevant parameters are known. An example of this is control of drug/hydrogel/emulsion particle size change due to solvent uptake.
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Affiliation(s)
- Anders Utoft
- Center for Single Particle Science and Engineering (SPSE), Health Sciences , University of Southern Denmark , Odense 5230 , Denmark
| | - Koji Kinoshita
- Center for Single Particle Science and Engineering (SPSE), Health Sciences , University of Southern Denmark , Odense 5230 , Denmark
| | | | - David Needham
- Center for Single Particle Science and Engineering (SPSE), Health Sciences , University of Southern Denmark , Odense 5230 , Denmark
- Department of Mechanical Engineering and Materials Science , Duke University , Durham , North Carolina 27708 , United States
- School of Pharmacy , University of Nottingham , Nottingham NG7 2RD , United Kingdom
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Thoke HS, Thorsteinsson S, Stock RP, Bagatolli LA, Olsen LF. The dynamics of intracellular water constrains glycolytic oscillations in Saccharomyces cerevisiae. Sci Rep 2017; 7:16250. [PMID: 29176686 PMCID: PMC5701229 DOI: 10.1038/s41598-017-16442-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 11/13/2017] [Indexed: 12/28/2022] Open
Abstract
We explored the dynamic coupling of intracellular water with metabolism in yeast cells. Using the polarity-sensitive probe 6-acetyl-2-dimethylaminonaphthalene (ACDAN), we show that glycolytic oscillations in the yeast S. cerevisiae BY4743 wild-type strain are coupled to the generalized polarization (GP) function of ACDAN, which measures the physical state of intracellular water. We analysed the oscillatory dynamics in wild type and 24 mutant strains with mutations in many different enzymes and proteins. Using fluorescence spectroscopy, we measured the amplitude and frequency of the metabolic oscillations and ACDAN GP in the resting state of all 25 strains. The results showed that there is a lower and an upper threshold of ACDAN GP, beyond which oscillations do not occur. This critical GP range is also phenomenologically linked to the occurrence of oscillations when cells are grown at different temperatures. Furthermore, the link between glycolytic oscillations and the ACDAN GP value also holds when ATP synthesis or the integrity of the cell cytoskeleton is perturbed. Our results represent the first demonstration that the dynamic behaviour of a metabolic process can be regulated by a cell-wide physical property: the dynamic state of intracellular water, which represents an emergent property.
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Affiliation(s)
- Henrik S Thoke
- Center for Biomembrane Physics (MEMPHYS), Odense M, Denmark.,Institute for Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK5230, Odense M, Denmark
| | - Sigmundur Thorsteinsson
- Institute for Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK5230, Odense M, Denmark
| | - Roberto P Stock
- Institute for Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK5230, Odense M, Denmark
| | - Luis A Bagatolli
- Center for Biomembrane Physics (MEMPHYS), Odense M, Denmark.,Yachay EP and Yachay Tech, Yachay City of Knowledge, 100650, Urcuquí-Imbabura, Ecuador
| | - Lars F Olsen
- Center for Biomembrane Physics (MEMPHYS), Odense M, Denmark. .,Institute for Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK5230, Odense M, Denmark.
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Parra E, Hervella P, Needham D. Real-Time Visualization of the Precipitation and Phase Behavior of Octaethylporphyrin in Lipid Microparticles. J Pharm Sci 2016; 106:1025-1041. [PMID: 27956095 DOI: 10.1016/j.xphs.2016.11.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 11/29/2016] [Indexed: 11/30/2022]
Abstract
The material properties of micro- and nanoparticles are fundamental for their bulk properties in suspension, like their stability and encapsulation efficiency. A particularly interesting system with potential biomedical applications is the encapsulation of hydrophobic porphyrins into lipid particles and their use as metal atom chelators, where retention and stability are keys for the design process. The overall goal here was to study the solubility, phase behavior, and mixing of octaethylporphyrin (OEP) and OEP-Cu chelates with 2 core materials, triolein (TO) and cholesteryl acetate, as single microparticles. We employed a real-time, single-particle microscopic technique based on micropipette injection to characterize the behavior of these materials and their mixtures upon solvent loss and precipitation. A clear phase separation was observed between the triolein liquid core and porphyrin microcrystals, and the ternary phase diagram of the droplet compositions and onsets of phase separation over solvent dissolution was built. On the contrary, cholesteryl acetate and OEP-Cu coprecipitated by solvent dissolution, preventing porphyrin crystallization even for very high supersaturations. This type of real-time, single-particle characterization is expected to offer important information about the formulation of other hydrophobic compounds of interest, where finding the proper encapsulation environment is a key step for their retention and stability.
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Affiliation(s)
- Elisa Parra
- Center for Single Particle Science and Engineering, University of Southern Denmark, Odense, Denmark.
| | - Pablo Hervella
- Center for Single Particle Science and Engineering, University of Southern Denmark, Odense, Denmark
| | - David Needham
- Center for Single Particle Science and Engineering, University of Southern Denmark, Odense, Denmark; Department of Mechanical Engineering and Material Science, Duke University, Durham, North Carolina 27708
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Bitterfield DL, Utoft A, Needham D. An Activity-Based Dissolution Model for Solute-Containing Microdroplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12749-12759. [PMID: 27802055 DOI: 10.1021/acs.langmuir.6b03126] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
When a solute is present in an aqueous droplet, the water activity in the droplet and the rate of droplet dissolution are both decreased (as compared to a pure water droplet). One of the main parameters that controls this effect is the dynamically changing solute concentration, and therefore water activity and chemical potential, at the droplet interface. This work addresses the importance of understanding how water activity changes during solution droplet dissolution. A model for dissolution rate is presented that accounts for the kinetic effects of changing water activity at the droplet interface during the dissolution of an aqueous salt solution microdroplet into a second immiscible liquid phase. The important underlying question in this model is whether the dissolving component can be considered in local equilibrium on both sides of the droplet interface and whether this assumption is sufficient to account for the kinetics of dissolution. The dissolution model is based on the Epstein-Plesset equation, which has previously been applied to pure gas (bubble) and liquid (droplet) dissolution into liquid phases, but not to salt solutions. The model is tested by using the micropipet technique to form and observe the dehydration of single NaCl solution microdroplets in octanol or butyl acetate. The model successfully predicts the droplet diameter as a function of time in both organic solvents. The NaCl concentration in water is measured well into the supersaturated area >5.4 M, and the supersaturation limit at which NaCl nucleation happens is reported to be 10.24 ± 0.31 M.
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Affiliation(s)
- Deborah L Bitterfield
- Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, United States
| | - Anders Utoft
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark , Odense, Denmark
| | - David Needham
- Department of Mechanical Engineering and Materials Science, Duke University , Durham, North Carolina 27708, United States
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark , Odense, Denmark
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From Single Microparticles to Microfluidic Emulsification: Fundamental Properties (Solubility, Density, Phase Separation) from Micropipette Manipulation of Solvent, Drug and Polymer Microspheres. Processes (Basel) 2016. [DOI: 10.3390/pr4040049] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Needham D, Arslanagic A, Glud K, Hervella P, Karimi L, Høeilund-Carlsen PF, Kinoshita K, Mollenhauer J, Parra E, Utoft A, Walke P. Bottom up design of nanoparticles for anti-cancer diapeutics: “put the drug in the cancer’s food”. J Drug Target 2016; 24:836-856. [DOI: 10.1080/1061186x.2016.1238092] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- David Needham
- Department of Mechanical Engineering and Material Science, Duke University, Durham, NC, USA
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark, Odense, Denmark
| | - Amina Arslanagic
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark, Odense, Denmark
| | - Kasper Glud
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark, Odense, Denmark
| | - Pablo Hervella
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark, Odense, Denmark
| | - Leena Karimi
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark, Odense, Denmark
| | | | - Koji Kinoshita
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark, Odense, Denmark
| | - Jan Mollenhauer
- NanoCAN, Institute for Molecular Medicine (IMM), SUND, University of Southern Denmark, Odense, Denmark
| | - Elisa Parra
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark, Odense, Denmark
| | - Anders Utoft
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark, Odense, Denmark
| | - Prasad Walke
- Center for Single Particle Science and Engineering (SPSE), University of Southern Denmark, Odense, Denmark
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Mustafa A, Erten A, Ayaz RMA, Kayıllıoğlu O, Eser A, Eryürek M, Irfan M, Muradoglu M, Tanyeri M, Kiraz A. Enhanced Dissolution of Liquid Microdroplets in the Extensional Creeping Flow of a Hydrodynamic Trap. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9460-9467. [PMID: 27571341 DOI: 10.1021/acs.langmuir.6b02411] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A novel noncontact technique based on hydrodynamic trapping is presented to study the dissolution of freely suspended liquid microdroplets into a second immiscible phase in a simple extensional creeping flow. Benzyl benzoate (BB) and n-decanol microdroplets are individually trapped at the stagnation point of a planar extensional flow, and dissolution of single microdroplets into an aqueous solution containing surfactant is characterized at different flow rates. The experimental dissolution curves are compared to two models: (i) the Epstein-Plesset (EP) model which considers only diffusive mass transfer, and (ii) the Zhang-Yang-Mao (ZYM) model which considers both diffusive and convective mass transfer in the presence of extensional creeping flow. The EP model significantly underpredicts the experimentally determined dissolution rates for all experiments. In contrast, very good agreement is observed between the experimental dissolution curves and the ZYM model when the saturation concentration of the microdroplet liquid (cs) is used as the only fitting parameter. Experiments with BB microdroplets at low surfactant concentration (10 μM) reveal cs values very similar to that reported in the literature. In contrast, experiments with BB and n-decanol microdroplets at 10 mM surfactant concentration, higher than the critical micelle concentration (CMC) of 5 mM, show further enhancements in microdroplet dissolution rates due to micellar solubilization. The presented method accurately tests the dissolution of single microdroplets into a second immiscible phase in extensional creeping flow and has potential for applications such as separation processes, food dispersion, and drug development/design.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Melikhan Tanyeri
- Department of Electrical and Electronics Engineering, Istanbul Sehir University , 34662 Uskudar, Istanbul Turkey
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Pasquier C, Beaufils S, Bouchoux A, Rigault S, Cabane B, Lund M, Lechevalier V, Le Floch-Fouéré C, Pasco M, Pabœuf G, Pérez J, Pezennec S. Osmotic pressures of lysozyme solutions from gas-like to crystal states. Phys Chem Chem Phys 2016; 18:28458-28465. [DOI: 10.1039/c6cp03867k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Osmotic pressures of lysozyme solutions at concentrations up to 850 g L−1 show three regimes and a clear influence of ionic strength.
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Affiliation(s)
| | | | | | | | - Bernard Cabane
- Laboratoire CBI
- CNRS UMR 8231
- Université Pierre et Marie Curie
- Université Diderot
- ESPCI
| | - Mikael Lund
- Department of Theoretical Chemistry
- Lund University
- SE-22100 Lund
- Sweden
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Li J, Turesson M, Haglund CA, Cabane B, Skepö M. Equation of state of PEG/PEO in good solvent. Comparison between a one-parameter EOS and experiments. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.10.056] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Aniket, Gaul DA, Bitterfield DL, Su JT, Li VM, Singh I, Morton J, Needham D. Enzyme Dehydration Using Microglassification™ Preserves the Protein's Structure and Function. J Pharm Sci 2015; 104:640-51. [DOI: 10.1002/jps.24279] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 10/29/2014] [Accepted: 11/03/2014] [Indexed: 11/08/2022]
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Bagatolli LA, Needham D. Quantitative optical microscopy and micromanipulation studies on the lipid bilayer membranes of giant unilamellar vesicles. Chem Phys Lipids 2014; 181:99-120. [PMID: 24632023 DOI: 10.1016/j.chemphyslip.2014.02.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 02/25/2014] [Accepted: 02/26/2014] [Indexed: 12/01/2022]
Abstract
This manuscript discusses basic methodological aspects of optical microscopy and micromanipulation methods to study membranes and reviews methods to generate giant unilamellar vesicles (GUVs). In particular, we focus on the use of fluorescence microscopy and micropipet manipulation techniques to study composition-structure-property materials relationships of free-standing lipid bilayer membranes. Because their size (∼5-100 μm diameter) that is well above the resolution limit of regular light microscopes, GUVs are suitable membrane models for optical microscopy and micromanipulation experimentation. For instance, using different fluorescent reporters, fluorescence microscopy allows strategies to study membrane lateral structure/dynamics at the level of single vesicles of diverse compositions. The micropipet manipulation technique on the other hand, uses Hoffman modulation contrast microscopy and allows studies on the mechanical, thermal, molecular exchange and adhesive-interactive properties of compositionally different membranes under controlled environmental conditions. The goal of this review is to (i) provide a historical perspective for both techniques; (ii) present and discuss some of their most important contributions to our understanding of lipid bilayer membranes; and (iii) outline studies that would utilize both techniques simultaneously on the same vesicle thus bringing the ability to characterize structure and strain responses together with the direct application of well-defined stresses to a single membrane or observe the effects of adhesive spreading. Knowledge gained by these studies has informed several applications of lipid membranes including their use as lung surfactants and drug delivery systems for cancer.
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Affiliation(s)
- Luis A Bagatolli
- Membrane Biophysics and Biophotonics Group/MEMPHYS - Center for Biomembrane Physics, Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark.
| | - David Needham
- DNRF Niels Bohr Professorship, Center for Single Particle Science and Engineering, Institute for Physics, Chemistry and Pharmacy, University of Southern Denmark, Odense, Denmark; Department of Mechanical Engineering and Material Science, Duke University, Durham, NC, USA
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Aniket, Gaul DA, Rickard DL, Needham D. MicroglassificationTM: A Novel Technique for Protein Dehydration. J Pharm Sci 2014; 103:810-20. [DOI: 10.1002/jps.23847] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 12/11/2013] [Accepted: 12/12/2013] [Indexed: 11/11/2022]
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Su JT, Needham D. Mass transfer in the dissolution of a multicomponent liquid droplet in an immiscible liquid environment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13339-45. [PMID: 24050124 PMCID: PMC3871864 DOI: 10.1021/la402533j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The Epstein-Plesset equation has recently been shown to predict accurately the dissolution of a pure liquid microdroplet into a second immiscible solvent, such as oil into water. Here, we present a series of new experiments and a modification to this equation to model the dissolution of a two-component oil-mixture microdroplet into a second immiscible solvent in which the two materials of the droplet have different solubilities. The model is based on a reduced surface area approximation and the assumption of ideal homogeneous mixing [mass flux d(m(i))/dt = A(frac(i))D(i)(c(i) - c(s)){(1/R) + (1/(πD(i)t)(1/2)}] where A(frac(i)) is the area fraction of component i, c(i) and c(s) are the initial and saturation concentrations of the droplet material in the surrounding medium, R is the radius of the droplet, t is time, and D(i) is the coefficient of diffusion of component i in the surrounding medium. This new model has been tested by the use of a two-chamber micropipet-based method, which measured the dissolution of single individual microdroplets of mutually miscible liquid mixtures (ethyl acetate/butyl acetate and butyl acetate/amyl acetate) in water. We additionally measured the diffusion coefficient of the pure materials-ethyl acetate, butyl acetate, and amyl acetate-in water at 22 °C. Diffusion coefficients for the pure acetates in water were 8.65 × 10(-6), 7.61 × 10(-6), and 9.14 × 10(-6) cm(2)/s, respectively. This model accurately predicts the dissolution of microdroplets for the ethyl acetate/butyl acetate and butyl acetate/amyl acetate systems given the solubility and diffusion coefficients of each of the individual components in water as well as the initial droplet radius. The average mean squared error was 8.96%. The dissolution of a spherical ideally mixed multicomponent droplet closely follows the modified Epstein-Plesset model presented here.
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Affiliation(s)
| | - David Needham
- Corresponding author. . Telephone: (919) 660-5355. Fax: (919) 660-8963
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Gilchrist SE, Rickard DL, Letchford K, Needham D, Burt HM. Phase separation behavior of fusidic acid and rifampicin in PLGA microspheres. Mol Pharm 2012; 9:1489-501. [PMID: 22482935 DOI: 10.1021/mp300099f] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The purpose of this study was to characterize the phase separation behavior of fusidic acid (FA) and rifampicin (RIF) in poly(d,l-lactic acid-co-glycolic acid) (PLGA) using a model microsphere formulation. To accomplish this, microspheres containing 20% FA with 0%, 5%, 10%, 20%, and 30% RIF and 20% RIF with 30%, 20% 10%, 5%, and 0% FA were prepared by solvent evaporation. Drug-polymer and drug-drug compatibility and miscibility were characterized using laser confocal microscopy, Raman spectroscopy, XRPD, DSC, and real-time video recordings of single-microsphere formation. The encapsulation of FA and RIF alone, or in combination, results in a liquid-liquid phase separation of solvent-and-drug-rich microdomains that are excluded from the polymer bulk during microsphere hardening, resulting in amorphous spherical drug-rich domains within the polymer bulk and on the microsphere surface. FA and RIF phase separate from PLGA at relative droplet volumes of 0.311 ± 0.014 and 0.194 ± 0.000, respectively, predictive of the incompatibility of each drug and PLGA. When coloaded, FA and RIF phase separate in a single event at the relative droplet volume 0.251 ± 0.002, intermediate between each of the monoloaded formulations and dependent on the relative contribution of FA or RIF. The release of FA and RIF from phase-separated microspheres was characterized exclusively by a burst release and was dependent on the phase exclusion of surface drug-rich domains. Phase separation results in coalescence of drug-rich microdroplets and polymer phase exclusion, and it is dependent on the compatibility between FA and RIF and PLGA. FA and RIF are mutually miscible in all proportions as an amorphous glass, and they phase separate from the polymer as such. These drug-rich domains were excluded to the surface of the microspheres, and subsequent release of both drugs from the microspheres was rapid and reflected this surface location.
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Affiliation(s)
- Samuel E Gilchrist
- Faculty of Pharmaceutical Science, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
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Pichon A. Protein under glass. Nat Chem 2010; 2:438. [DOI: 10.1038/nchem.679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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