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Larson NR, Bou-Assaf GM. Increasing the Resolution of Field-Flow Fractionation with Increasing Crossflow Gradients. Anal Chem 2023; 95:16138-16143. [PMID: 37874938 DOI: 10.1021/acs.analchem.3c02570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
Abstract
The resolution of flow field-flow fractionation (flow FFF) depends primarily on the crossflow rate and its change over time. In this work, we demonstrate a method for modulation of the crossflow rate during separation that increases the peak-to-peak resolution of the resulting fractograms. In classical FFF methods, the crossflow rate is either maintained constant or decreased during the separation of the different species. In this work, higher resolution between peaks was achieved by a novel gradient method in which the crossflow is increased briefly during separation to allow stronger retention of the later eluting peaks. We first outline the theoretical basis by which improved separation is achieved. We confirm our hypothesis by quantifying the impact of increasing crossflow on the resolution between a monoclonal antibody monomer and its high-molecular-weight aggregate. We then demonstrate that this method is applicable to two different FFF methods (AF4 and HF5) and various pharmaceutically relevant samples (monoclonal antibodies and adeno-associated viruses). Finally, we hypothesize that increasing the force perpendicular to the laminar flow as described here is broadly applicable to all FFF methods and improves the quality of FFF-based separations.
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Affiliation(s)
- Nicholas R Larson
- Pharmaceutical Operations & Technology, 225 Binney Street, Cambridge, Massachusetts 02142, United States
| | - George M Bou-Assaf
- Pharmaceutical Operations & Technology, 225 Binney Street, Cambridge, Massachusetts 02142, United States
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2
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Podzimek S. Comparative Study of SEC and AF4 in the Characterization of Organic Soluble Synthetic Polymers. Chromatographia 2022. [DOI: 10.1007/s10337-022-04217-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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3
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Fujii S, Sakurai K. Zwitterionic Amino Acid Polymer-Grafted Core-Crosslinked Particle toward Tumor Delivery. Biomacromolecules 2022; 23:3968-3977. [PMID: 36018790 DOI: 10.1021/acs.biomac.2c00803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Zwitterionic amino acid polymers (ZAPs) exhibit biocompatibility and recognition capability for amino acid transporters (AATs) overexpressed on cancer cells. They are potential cancer-targeting ligands in nanoparticle-based nanomedicines utilized in cancer chemotherapy. Here, a poly(glutamine methacrylate) (pGlnMA)-grafted core-crosslinked particle (pGlnMA-CCP) is prepared through the formation of nanoemulsions stabilized using amphiphilic block copolymers comprising pGlnMA as the hydrophilic block. The chain conformation of the grafted polymer and the particle structure of pGlnMA-CCP are precisely elucidated by dynamic light scattering, X-ray scattering, and transmission electron microscopy. pGlnMA-CCP demonstrates active cellular uptake and deep penetration behaviors for cancer cells and spheroids, respectively, via an AAT-mediated mechanism. The in vivo pharmacokinetics of pGlnMA-CCP is practically comparable to those of a CCP covered with poly(polyethylene glycol methacrylate) (pPEGMA), which inhibits protein adsorption and prolongs blood retention, implying that the biocompatible properties of pGlnMA are similar to those of pPEGMA. Furthermore, pGlnMA-CCP accumulates in cancer tissues at a higher level than that of pPEGMA systems. The results demonstrate that the properties of cancer targetability, tumor permeability, efficient tumor accumulation, and biocompatibility can be obtained by grafting pGlnMA onto nanoparticles, suggesting a high potential of pGlnMA as a ligand for cancer-targeting nanomedicines.
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Affiliation(s)
- Shota Fujii
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0135, Japan
| | - Kazuo Sakurai
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Kitakyushu, Fukuoka 808-0135, Japan
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4
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Marin A, Brito J, Sukhishvili SA, Andrianov AK. Cationic Fluoropolyphosphazenes: Synthesis and Assembly with Heparin as a Pathway to Hemocompatible Nanocoatings. ACS APPLIED BIO MATERIALS 2022; 5:313-321. [PMID: 35014813 DOI: 10.1021/acsabm.1c01099] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The development of state-of-the-art blood-contacting devices can be advanced through integrating hemocompatibility, durability, and anticoagulant functionalities within engineered nanoscale coatings. To enable all-aqueous assembly of nanocoatings combining omniphobic fluorinated features with the potent anticoagulant activity of hydrophilic heparin, two fluoropolymers containing cationic functionalities were synthesized─poly[(trifluoroethoxy)(dimethylaminopropyloxy)phosphazene], PFAP-O, and poly[(trifluoroethoxy)(dimethylaminopropylamino)phosphazene], PFAP-A. Despite a relatively high content of fluorinated pendant groups─approximately 50% (mol) in each─both polymers displayed solubility in aqueous solutions and were able to spontaneously form stable supramolecular complexes with heparin, as determined by dynamic light scattering and asymmetric flow field-flow fractionation methods. Heparin-containing coatings were then assembled by layer-by-layer deposition in aqueous solutions. Nanoassembled coatings were evaluated for potential thrombogenicity in three important categories of in vitro tests─coagulation by thrombin generation, platelet retention, and hemolysis. In all assays, heparin-containing fluoro-coatings consistently displayed superior performance compared to untreated titanium surfaces or fluoro-coatings assembled using poly(acrylic acid) in the absence of heparin. Short-term stability studies revealed the noneluting nature of these noncovalently assembled coatings.
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Affiliation(s)
- Alexander Marin
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland 20853, United States
| | - Jordan Brito
- Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77845, United States
| | - Svetlana A Sukhishvili
- Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77845, United States
| | - Alexander K Andrianov
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland 20853, United States
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5
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Greyling G, Lederer A, Pasch H. Thermal Field-Flow Fractionation for the Investigation of the Thermoresponsive Nature of Star and Linear Polystyrene. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201800417] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Guilaume Greyling
- Department of Chemistry and Polymer Science University of Stellenbosch; Private Bag X1; 7602 Matieland South Africa
| | - Albena Lederer
- Leibniz Institute of Polymer Research Dresden, Hohe Straße 6; D-01069 Dresden and Technische Universität Dresden; D-01062 Dresden Germany
| | - Harald Pasch
- Department of Chemistry and Polymer Science University of Stellenbosch; Private Bag X1; 7602 Matieland South Africa
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6
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Striegel AM, Ahmad IAH. Determining the Chemical-Heterogeneity-Corrected Molar Mass Averages and Distribution of Poly(styrene- co- t-butyl methacrylate) Using SEC/MALS/UV/DRI. Chromatographia 2018; 81. [PMID: 31274874 DOI: 10.1007/s10337-018-3512-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Chemical heterogeneity, defined as the change (or lack thereof) across the molar mass distribution (MMD) in the monomeric ratio of a copolymer, can influence processing and end-use properties such as solubility, gas permeation, conductivity, and the energy of interfacial fracture. Given that each parent homopolymer of the copolymer monomeric components has a different specific refractive index increment (∂n/∂c) from the other component, chemical heterogeneity translates into ∂n/∂c heterogeneity. The latter, in turn, affects the accuracy of the molar mass (M) averages and distributions of the copolymers in question. Here, employing size-exclusion chromatography coupled on-line to multi-angle static light scattering, ultraviolet absorption spectroscopy, and differential refractometry detection, the chemical heterogeneity (given as mass percent styrene) was determined for a poly(styrene-co-t-butyl methacrylate) copolymer. Also determined were the chemical-heterogeneity-corrected M averages and MMD of the copolymer. In the present case, the error in molar mass incurred by ignoring the effects of chemical heterogeneity in the M calculations is seen to reach as high as 53,000 g mol-1 at the high end of the MMD. This error could be much higher, however, in copolymers with higher M or with larger difference among component ∂n/∂c values, as compared to the current analyte.
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Affiliation(s)
- André M Striegel
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), 100 Bureau Drive, MS 8392, Gaithersburg, MD 20899-8392, USA
| | - Imad A Haidar Ahmad
- Process Research and Development, Merck and Co., Inc., Rahway, NJ 07065, USA
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Bolinsson H, Lu Y, Hall S, Nilsson L, Håkansson A. An alternative method for calibration of flow field flow fractionation channels for hydrodynamic radius determination: The nanoemulsion method (featuring multi angle light scattering). J Chromatogr A 2018; 1533:155-163. [DOI: 10.1016/j.chroma.2017.12.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 11/23/2017] [Accepted: 12/10/2017] [Indexed: 11/15/2022]
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8
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Zielke C, Fuentes C, Piculell L, Nilsson L. Co-elution phenomena in polymer mixtures studied by asymmetric flow field-flow fractionation. J Chromatogr A 2018; 1532:251-256. [DOI: 10.1016/j.chroma.2017.12.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 12/11/2017] [Accepted: 12/11/2017] [Indexed: 11/27/2022]
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9
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Abstract
The specific refractive index increment (∂n/∂c) is an essential datum for the accurate quantitation of molar mass averages and distributions (inter alia) of macromolecules when refractometry, static light scattering, and/or viscometry detection are coupled on-line to size-based separation techniques. The latter include methods such as size-exclusion and hydrodynamic chromatography, and asymmetric and hollow-fiber flow field-flow fractionation. The ∂n/∂c is also needed for accurate determination of the weight-average molar mass of polymers by off-line, batch-mode multi-angle static light scattering. However, not only does ∂n/∂c differ among chemical species, it also depends on experimental conditions such as solvent, temperature, and wavelength. For the last seventeen years, the author's laboratories have measured the ∂n/∂c of a variety of natural and synthetic polymers, at both 690 nm and, more recently, 660 nm, under a variety of solvent and temperature conditions. In all cases, this has been done by off-line, batch-mode differential refractometry, not by assuming 100% analyte column recovery and 100% accurate peak integration. Results of these determinations are presented here, along with the relevant experimental data.
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Affiliation(s)
- André M Striegel
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), 100 Bureau Drive, MS 8392, Gaithersburg, MD USA 20899-8392
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10
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Abdelmohsen LK, Rikken RS, Christianen PC, van Hest JC, Wilson DA. Shape characterization of polymersome morphologies via light scattering techniques. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.06.067] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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11
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12
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Pitkänen L, Striegel AM. Size-exclusion chromatography of metal nanoparticles and quantum dots. Trends Analyt Chem 2015; 80:311-320. [PMID: 27335508 DOI: 10.1016/j.trac.2015.06.013] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
This review presents an overview of size-exclusion chromatographic separation and characterization of noble metal nanoparticles (NPs) and quantum dots (QDs) over the past 25 years. The properties of NPs and QDs that originate from quantum and surface effects are size dependent; to investigate these properties, a separation technique such as size-exclusion chromatography (SEC) is often needed to obtain narrow distribution NP populations that are also separated from the unreacted starting materials. Information on the size distributions and optical properties of NPs have been obtained by coupling SEC to detection methods such as ultraviolet-visible and/or fluorescence spectroscopy. Problems associated with the sorption of NPs and QDs onto various SEC stationary phases, employing both aqueous and organic eluents, are also discussed here.
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Affiliation(s)
- Leena Pitkänen
- National Institute of Standards and Technology, Chemical Sciences Division, 100 Bureau Drive, MS 8392, Gaithersburg, MD 20899, USA
| | - André M Striegel
- National Institute of Standards and Technology, Chemical Sciences Division, 100 Bureau Drive, MS 8392, Gaithersburg, MD 20899, USA
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13
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Boye S, Ennen F, Scharfenberg L, Appelhans D, Nilsson L, Lederer A. From 1D Rods to 3D Networks: A Biohybrid Topological Diversity Investigated by Asymmetrical Flow Field-Flow Fractionation. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00824] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Susanne Boye
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Franka Ennen
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
- Technische Universität
Dresden, 01062 Dresden, Germany
| | - Linda Scharfenberg
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
- Technische Universität
Dresden, 01062 Dresden, Germany
| | - Dietmar Appelhans
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
| | - Lars Nilsson
- Food
Colloids Group and Lund Center for Field-Flow Fractionation, Department
of Food Technology, Engineering and Nutrition, Faculty of Engineering
LTH, Lund University, Lund, Sweden
| | - Albena Lederer
- Leibniz-Institut
für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
- Technische Universität
Dresden, 01062 Dresden, Germany
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14
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Striegel AM, Pitkänen L. Detection Orthogonality in Macromolecular Separations: Role of the On-Line Viscometer in Characterizing Polymers at Conditions of “Spectroscopic Invisibility”. Chromatographia 2015. [DOI: 10.1007/s10337-015-2898-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Pitkänen L, Urbas AA, Striegel AM. On the feasibility of determining polymer chemical heterogeneity by SEC with continuous off-line Raman detection. Polym Chem 2015. [DOI: 10.1039/c5py00189g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Examined here is the feasibility of employing Raman spectroscopy as a detection method in size-exclusion chromatography (SEC) and related macromolecular separations, for the purposes of determining the chemical heterogeneity of copolymers.
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Affiliation(s)
- Leena Pitkänen
- Chemical Sciences Division
- National Institute of Standards and Technology (NIST)
- Gaithersburg
- USA
| | - Aaron A. Urbas
- Biosystems and Biomaterials Division
- National Institute of Standards and Technology (NIST)
- Gaithersburg
- USA
| | - André M. Striegel
- Chemical Sciences Division
- National Institute of Standards and Technology (NIST)
- Gaithersburg
- USA
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