1
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Krishnan J, Poomalai P, Ravichandran A, Reddy A, Sureshkumar R. A Concise Review on Effect of PEGylation on the Properties of Lipid-Based Nanoparticles. Assay Drug Dev Technol 2024; 22:246-264. [PMID: 38828531 DOI: 10.1089/adt.2024.015] [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] [Indexed: 06/05/2024] Open
Abstract
Nanoparticle-based drug delivery systems have emerged as promising platforms for enhancing therapeutic efficacy while minimizing off-target effects. Among various strategies employed to optimize these systems, polyethylene glycol (PEG) modification, known as PEGylation-the covalent attachment of PEG to nanoparticles, has gained considerable attention for its ability to impart stealth properties to nanoparticles while also extending circulation time and improving biocompatibility. PEGylation extends to different drug delivery systems, in specific, nanoparticles for targeting cancer cells, where the concentration of drug in the cancer cells is improved by virtue of PEGylation. The primary challenge linked to PEGylation lies in its confirmation. Numerous research findings provide comprehensive insights into selecting PEG for various PEGylation methods. In this review, we have endeavored to consolidate the outcomes concerning the choice of PEG and diverse PEGylation techniques.
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Affiliation(s)
- Janesha Krishnan
- Department of Pharmaceutics, Center for Nano Engineering Science & Technology (C-NEST), JSS Academy of Higher Education and Research, JSS College of Pharmacy, Ooty, India
| | - Praveena Poomalai
- Department of Pharmaceutics, Center for Nano Engineering Science & Technology (C-NEST), JSS Academy of Higher Education and Research, JSS College of Pharmacy, Ooty, India
| | - Ashwin Ravichandran
- Department of Pharmaceutics, Center for Nano Engineering Science & Technology (C-NEST), JSS Academy of Higher Education and Research, JSS College of Pharmacy, Ooty, India
| | - Aishwarya Reddy
- Department of Pharmaceutics, Center for Nano Engineering Science & Technology (C-NEST), JSS Academy of Higher Education and Research, JSS College of Pharmacy, Ooty, India
| | - Raman Sureshkumar
- Department of Pharmaceutics, Center for Nano Engineering Science & Technology (C-NEST), JSS Academy of Higher Education and Research, JSS College of Pharmacy, Ooty, India
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2
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Donadoni E, Siani P, Frigerio G, Milani C, Cui Q, Di Valentin C. The effect of polymer coating on nanoparticles' interaction with lipid membranes studied by coarse-grained molecular dynamics simulations. NANOSCALE 2024. [PMID: 38646798 DOI: 10.1039/d4nr00495g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
Nanoparticles' (NPs) permeation through cell membranes, whether it happens via passive or active transport, is an essential initial step for their cellular internalization. The NPs' surface coating impacts the way they translocate through the lipid bilayer and the spontaneity of the process. Understanding the molecular details of NPs' interaction with cell membranes allows the design of nanosystems with optimal characteristics for crossing the lipid bilayer: computer simulations are a powerful tool for this purpose. In this work, we have performed coarse-grained molecular dynamics simulations and free energy calculations on spherical titanium dioxide NPs conjugated with polymer chains of different chemical compositions. We have demonstrated that the hydrophobic/hydrophilic character of the chains, more than the nature of their terminal group, plays a crucial role in determining the NPs' interaction with the lipid bilayer and the thermodynamic spontaneity of NPs' translocation from water to the membrane. We envision that this computational work will be helpful to the experimental community in terms of the rational design of NPs for efficient cell membrane permeation.
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Affiliation(s)
- Edoardo Donadoni
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125 Milan, Italy.
- Department of Chemistry, Boston University, 590 Commonwealth Ave, Boston, MA 02215, USA
| | - Paulo Siani
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125 Milan, Italy.
| | - Giulia Frigerio
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125 Milan, Italy.
| | - Carolina Milani
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125 Milan, Italy.
| | - Qiang Cui
- Department of Chemistry, Boston University, 590 Commonwealth Ave, Boston, MA 02215, USA
| | - Cristiana Di Valentin
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125 Milan, Italy.
- BioNanoMedicine Center NANOMIB, University of Milano-Bicocca, Italy
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3
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Frigerio G, Donadoni E, Siani P, Vertemara J, Motta S, Bonati L, Gioia LD, Valentin CD. Mechanism of RGD-conjugated nanodevice binding to its target protein integrin α Vβ 3 by atomistic molecular dynamics and machine learning. NANOSCALE 2024; 16:4063-4081. [PMID: 38334981 DOI: 10.1039/d3nr05123d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
Active targeting strategies have been proposed to enhance the selective uptake of nanoparticles (NPs) by diseased cells, and recent experimental findings have proven the effectiveness of this approach. However, no mechanistic studies have yet revealed the atomistic details of the interactions between ligand-activated NPs and integrins. As a case study, here we investigate, by means of advanced molecular dynamics simulations (MD) and machine learning methods (namely equilibrium MD, binding free energy calculations and training of self-organized maps), the interaction of a cyclic-RGD-conjugated PEGylated TiO2 NP (the nanodevice) with the extracellular segment of integrin αVβ3 (the target), the latter experimentally well-known to be over-expressed in several solid tumors. Firstly, we proved that the cyclic-RGD ligand binding to the integrin pocket is established and kept stable even in the presence of the cumbersome realistic model of the nanodevice. In this respect, the unsupervised machine learning analysis allowed a detailed comparison of the ligand/integrin binding in the presence and in the absence of the nanodevice, which unveiled differences in the chemical features. Then, we discovered that unbound cyclic RGDs conjugated to the NP largely contribute to the interactions between the nanodevice and the integrin. Finally, by increasing the density of cyclic RGDs on the PEGylated TiO2 NP, we observed a proportional enhancement of the nanodevice/target binding. All these findings can be exploited to achieve an improved targeting selectivity and cellular uptake, and thus a more successful clinical outcome.
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Affiliation(s)
- Giulia Frigerio
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
| | - Edoardo Donadoni
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
| | - Paulo Siani
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
| | - Jacopo Vertemara
- Dipartimento di Biotecnologie e Bioscienze, Università di Milano-Bicocca, Piazza della Scienza 1, 20126 Milan, Italy
| | - Stefano Motta
- Dipartimento di Scienze dell'Ambiente e del Territorio, Università di Milano-Bicocca, Piazza della Scienza 1, 20126 Milan, Italy
| | - Laura Bonati
- Dipartimento di Scienze dell'Ambiente e del Territorio, Università di Milano-Bicocca, Piazza della Scienza 1, 20126 Milan, Italy
| | - Luca De Gioia
- Dipartimento di Biotecnologie e Bioscienze, Università di Milano-Bicocca, Piazza della Scienza 1, 20126 Milan, Italy
| | - Cristiana Di Valentin
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
- BioNanoMedicine Center NANOMIB, Università di Milano-Bicocca, Italy
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4
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Donadoni E, Frigerio G, Siani P, Motta S, Vertemara J, De Gioia L, Bonati L, Di Valentin C. Molecular Dynamics for the Optimal Design of Functionalized Nanodevices to Target Folate Receptors on Tumor Cells. ACS Biomater Sci Eng 2023; 9:6123-6137. [PMID: 37831005 PMCID: PMC10646887 DOI: 10.1021/acsbiomaterials.3c00942] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 10/02/2023] [Indexed: 10/14/2023]
Abstract
Atomistic details on the mechanism of targeting activity by biomedical nanodevices of specific receptors are still scarce in the literature, where mostly ligand/receptor pairs are modeled. Here, we use atomistic molecular dynamics (MD) simulations, free energy calculations, and machine learning approaches on the case study of spherical TiO2 nanoparticles (NPs) functionalized with folic acid (FA) as the targeting ligand of the folate receptor (FR). We consider different FA densities on the surface and different anchoring approaches, i.e., direct covalent bonding of FA γ-carboxylate or through polyethylene glycol spacers. By molecular docking, we first identify the lowest energy conformation of one FA inside the FR binding pocket from the X-ray crystal structure, which becomes the starting point of classical MD simulations in a realistic physiological environment. We estimate the binding free energy to be compared with the existing experimental data. Then, we increase complexity and go from the isolated FA to a nanosystem decorated with several FAs. Within the simulation time framework, we confirm the stability of the ligand-receptor interaction, even in the presence of the NP (with or without a spacer), and no significant modification of the protein secondary structure is observed. Our study highlights the crucial role played by the spacer, FA protonation state, and density, which are parameters that can be controlled during the nanodevice preparation step.
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Affiliation(s)
- Edoardo Donadoni
- Dipartimento
di Scienza dei Materiali, Università
di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Giulia Frigerio
- Dipartimento
di Scienza dei Materiali, Università
di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Paulo Siani
- Dipartimento
di Scienza dei Materiali, Università
di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Stefano Motta
- Dipartimento
di Scienze dell’Ambiente e del Territorio, Università di Milano-Bicocca, Piazza della Scienza 1, 20126 Milano, Italy
| | - Jacopo Vertemara
- Dipartimento
di Biotecnologie e Bioscienze, Università
di Milano-Bicocca, Piazza
della Scienza 1, 20126 Milano, Italy
| | - Luca De Gioia
- Dipartimento
di Biotecnologie e Bioscienze, Università
di Milano-Bicocca, Piazza
della Scienza 1, 20126 Milano, Italy
| | - Laura Bonati
- Dipartimento
di Scienze dell’Ambiente e del Territorio, Università di Milano-Bicocca, Piazza della Scienza 1, 20126 Milano, Italy
| | - Cristiana Di Valentin
- Dipartimento
di Scienza dei Materiali, Università
di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
- BioNanoMedicine
Center NANOMIB, Università di Milano-Bicocca, via R. Follereau 3, 20854 Vedano al Lambro, Italy
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5
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Jarak I, Isabel Santos A, Helena Pinto A, Domingues C, Silva I, Melo R, Veiga F, Figueiras A. Colorectal cancer cell exosome and cytoplasmic membrane for homotypic delivery of therapeutic molecules. Int J Pharm 2023; 646:123456. [PMID: 37778515 DOI: 10.1016/j.ijpharm.2023.123456] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 09/26/2023] [Accepted: 09/27/2023] [Indexed: 10/03/2023]
Abstract
Colorectal cancer (CRC) is one of the most common causes of death in the world. The multi-drug resistance, especially in metastatic colorectal cancer, drives the development of new strategies that secure a positive outcome and reduce undesirable side effects. Nanotechnology has made an impact in addressing some pharmacokinetic and safety issues related to administration of free therapeutic agents. However, demands of managing complex biointerfacing require equally complex methods for introducing stimuli-responsive or targeting elements. In order to procure a more efficient solution to the overcoming of biological barriers, the physiological functions of cancer cell plasma and exosomal membranes provided the source of highly functionalized coatings. Biomimetic nanovehicles based on colorectal cancer (CRC) membranes imparted enhanced biological compatibility, immune escape and protection to diverse classes of therapeutic molecules. When loaded with therapeutic load or used as a coating for other therapeutic nanovehicles, they provide highly efficient and selective cell targeting and uptake. This review presents a detailed overview of the recent application of homotypic biomimetic nanovehicles in the management of CRC. We also address some of the current possibilities and challenges associated with the CRC membrane biomimetics.
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Affiliation(s)
- Ivana Jarak
- Univ Coimbra, Laboratory of Drug Development and Technologies, Faculty of Pharmacy, Coimbra, Portugal; Univ Porto, Instituto de Investigação e Inovação em Saúde, Porto, Portugal
| | - Ana Isabel Santos
- Univ Coimbra, Laboratory of Drug Development and Technologies, Faculty of Pharmacy, Coimbra, Portugal
| | - Ana Helena Pinto
- Univ Coimbra, Laboratory of Drug Development and Technologies, Faculty of Pharmacy, Coimbra, Portugal
| | - Cátia Domingues
- Univ Coimbra, Laboratory of Drug Development and Technologies, Faculty of Pharmacy, Coimbra, Portugal; Univ Coimbra, REQUIMTE/LAQV, Group of Pharmaceutical Technology, Coimbra, Portugal; Univ Coimbra, Institute for Clinical and Biomedical Research (iCBR) Area of Environment Genetics and Oncobiology (CIMAGO), Faculty of Medicine, Coimbra, Portugal
| | - Inês Silva
- Univ Coimbra, Laboratory of Drug Development and Technologies, Faculty of Pharmacy, Coimbra, Portugal
| | - Raquel Melo
- Univ Coimbra, Laboratory of Drug Development and Technologies, Faculty of Pharmacy, Coimbra, Portugal
| | - Francisco Veiga
- Univ Coimbra, Laboratory of Drug Development and Technologies, Faculty of Pharmacy, Coimbra, Portugal; Univ Coimbra, REQUIMTE/LAQV, Group of Pharmaceutical Technology, Coimbra, Portugal
| | - Ana Figueiras
- Univ Coimbra, Laboratory of Drug Development and Technologies, Faculty of Pharmacy, Coimbra, Portugal; Univ Coimbra, REQUIMTE/LAQV, Group of Pharmaceutical Technology, Coimbra, Portugal.
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6
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Moncure P, Millstone JE, Laaser JE. Role of Ligand Shell Density in the Diffusive Behavior of Nanoparticles in Hydrogels. J Phys Chem B 2023; 127:9366-9377. [PMID: 37857360 PMCID: PMC10626584 DOI: 10.1021/acs.jpcb.3c03249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 09/01/2023] [Indexed: 10/21/2023]
Abstract
The diffusion coefficients of poly(ethylene glycol) methyl ether thiol (PEGSH)-functionalized gold nanoparticles (NPs) with different effective grafting densities were measured in polyacrylamide hydrogels. The NP core size was held constant, and the NPs were functionalized with mixtures of short oligomeric ligands (254 Da PEGSH) and longer (either 1 or 2 kDa PEGSH) ligands. The ratio of short and long ligands was varied such that the grafting density of the high-molecular-weight (MW) ligand ranged from approximately 1 to 100 high-MW ligands/NP. The diffusion coefficients of the NPs were then measured in gels with varying average mesh sizes. The measured diffusion coefficients decreased with higher MW ligand density. Interestingly, the diffusion coefficients for NPs with high effective grafting densities were well-predicted by their hydrodynamic diameters, but the diffusion coefficients for NPs with low effective grafting densities were higher than expected from their hydrodynamic diameters. These results suggest that crowding in the NP ligand shell influences the mechanism of diffusion, with lower grafting densities allowing ligand chain relaxations that facilitate movement through the gel. This work brings new insights into the factors that dictate how NPs move through hydrogels and will inform the development of models for applications such as drug delivery in complex viscoelastic biological materials.
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Affiliation(s)
- Paige
J. Moncure
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Jill E. Millstone
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Jennifer E. Laaser
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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7
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Motta S, Siani P, Donadoni E, Frigerio G, Bonati L, Di Valentin C. Metadynamics simulations for the investigation of drug loading on functionalized inorganic nanoparticles. NANOSCALE 2023; 15:7909-7919. [PMID: 37066796 DOI: 10.1039/d3nr00397c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Inorganic nanoparticles show promising properties that allow them to be efficiently used as drug carriers. The main limitation in this type of application is currently the drug loading capacity, which can be overcome with a proper functionalization of the nanoparticle surface. In this study, we present, for the first time, a computational approach based on metadynamics to estimate the binding free energy of the doxorubicin drug (DOX) to a functionalized TiO2 nanoparticle under different pH conditions. On a thermodynamic basis, we demonstrate the robustness of our approach to capture the overall mechanism behind the pH-triggered release of DOX due to environmental pH changes. Notably, binding free energy estimations align well with what is expected for a pH-sensitive drug delivery system. Based on our results, we envision the use of metadynamics as a promising computational tool for the rational design and in silico optimization of organic ligands with improved drug carrier properties.
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Affiliation(s)
- Stefano Motta
- Dipartimento di Scienze dell'Ambiente e del Territorio, Università di Milano Bicocca, Piazza della Scienza 1, 20126 Milano, Italy
| | - Paulo Siani
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
| | - Edoardo Donadoni
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
| | - Giulia Frigerio
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
| | - Laura Bonati
- Dipartimento di Scienze dell'Ambiente e del Territorio, Università di Milano Bicocca, Piazza della Scienza 1, 20126 Milano, Italy
| | - Cristiana Di Valentin
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
- BioNanoMedicine Center NANOMIB, University of Milano-Bicocca, Italy
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8
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Li HC, Liu DL, Luo X, Yuan T, Zhan K, Gan J. Enhanced Adhesion Properties of Polymer-Metal Interfaces via Nano-injection Molding: A Study on Molecular Kinematic Mechanisms. CHINESE JOURNAL OF POLYMER SCIENCE 2023. [DOI: 10.1007/s10118-023-2906-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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9
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Głogowska K, Pączkowski P, Gawdzik B. Assessment Study on the Solvent Resistance of Low-Density Polyethylene with Pumpkin Seed Hulls. MATERIALS (BASEL, SWITZERLAND) 2022; 16:138. [PMID: 36614478 PMCID: PMC9821635 DOI: 10.3390/ma16010138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 12/16/2022] [Accepted: 12/20/2022] [Indexed: 06/17/2023]
Abstract
When designing products that are made of composite materials and that contain natural fillers, it is particularly important to consider the long-term exposure of these materials to caustic liquids and substances (concentrated acids, bases), and to ensure that these products meet strict requirements for reliability and operational safety. This study investigated the effects of different solvents on the mass, mechanical, thermal, surface, and structural properties of polymer composites containing natural fillers in the form of pumpkin seed hulls. Experiments were conducted using four different filler contents (5, 10, 15, and 20 wt%) and grain sizes ranging from 0.2 to 0.4 mm and 0.6 to 0.8 mm. Hybrid injection-moulded pieces were immersed in distilled water (H2O), 1% NaOH solution, acetone (C3H6O), and toluene (C7H8) for 84 days. After that, their mechanical and thermal properties as well as their structure geometries were analysed statistically. Changes in the properties of the tested composite materials were assessed depending on the solvent type, and the statistical significance of these changes were determined. The results showed that the nature of degradation depended on the applied solvent type. It was observed that the polymer matrix of the toluene-immersed samples absorbed the liquid to a significant extent first and then underwent a gradual degradation with time. In contrast, the samples immersed in water showed a slight increase in their mass. It was found that all tested properties of the composite samples deteriorated irrespective of the solvent type.
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Affiliation(s)
- Karolina Głogowska
- Department of Technology and Polymer Processing, Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, 20-618 Lublin, Poland
| | - Przemysław Pączkowski
- Department of Polymer Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, Gliniana 33, 20-614 Lublin, Poland
| | - Barbara Gawdzik
- Department of Polymer Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, Gliniana 33, 20-614 Lublin, Poland
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10
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Mochizuki K. The packing parameter of bare surfactant does not necessarily indicate morphological changes. J Colloid Interface Sci 2022; 631:17-21. [DOI: 10.1016/j.jcis.2022.10.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/27/2022] [Accepted: 10/31/2022] [Indexed: 11/11/2022]
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11
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Growth inhibition of bacterial pathogens by photo-catalyst process of nano-alloys FeCuNi doped TiO 2 under ultraviolet irradiation. Heliyon 2022; 8:e10611. [PMID: 36158092 PMCID: PMC9489971 DOI: 10.1016/j.heliyon.2022.e10611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/02/2022] [Accepted: 09/07/2022] [Indexed: 11/22/2022] Open
Abstract
This study reports the application of FeCuNi nano-alloy doped TiO2 synthesized via the sol-gel method as an antibacterial with a sterilization rate greater than 95% under ultra-violet (UV) irradiation. The performance was characterized using X-ray diffraction (XRD), thermal analysis (TG-DTA), scanning electron microscope (SEM-EDX), and transmission electron microscope (TEM). The results showed that the sterilization process of FeCuNi–TiO2 in cell suspension of Escherichia coli, Staphylococcus aureus and Bacillus subtilis increased the effectiveness of UV irradiation at wavelength (λ) ≥ 385 nm after 120 min. The optimum growth inhibition of FeCuNi–TiO2 was observed in the concentrations 1.5 g/L of E. coli, 1.5 g/L of S. aureus and 2.0 g/L of B. subtilis. The highest antimicrobial efficiency of FeCuNi–TiO2 powder was provided by a particle size of 16.8 nm, surface area of 70.98 m2/g. The increased antimicrobial activity in multiplied-three doped ions was related to the increase of illumination energy of UV absorption in the photo-catalyst process. The inhibition mechanism reaction of the three species of bacteria cell affects the lipid peroxidation process at the microbe cell’s wall. This was indicated by the formation of malondialdehyde (MDA). Lipid oxidation was based on the reaction of 2-thiobarbituric acid (TBARS) as an indicator of primary and secondary oxidation.
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12
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Donadoni E, Siani P, Frigerio G, Di Valentin C. Multi-scale modeling of folic acid-functionalized TiO 2 nanoparticles for active targeting of tumor cells. NANOSCALE 2022; 14:12099-12116. [PMID: 35959762 PMCID: PMC9404434 DOI: 10.1039/d2nr02603a] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 08/08/2022] [Indexed: 05/22/2023]
Abstract
Strategies based on the active targeting of tumor cells are emerging as smart and efficient nanomedical procedures. Folic acid (FA) is a vitamin and a well-established tumor targeting agent because of its strong affinity for the folate receptor (FR), which is an overexpressed protein on the cell membranes of the tumor cells. FA can be successfully anchored to several nanocarriers, including inorganic nanoparticles (NPs) based on transition metal oxides. Among them, TiO2 is extremely interesting because of its excellent photoabsorption and photocatalytic properties, which can be exploited in photodynamic therapy. However, it is not yet clear in which respects direct anchoring of FA to the NP or the use of spacers, based on polyethylene glycol (PEG) chains, are different and whether one approach is better than the other. In this work, we combine Quantum Mechanics (QM) and classical Molecular Dynamics (MD) to design and optimize the FA functionalization on bare and PEGylated TiO2 models and to study the dynamical behavior of the resulting nanoconjugates in a pure water environment and in physiological conditions. We observe that they are chemically stable, even under the effect of increasing temperature (up to 500 K). Using the results from long MD simulations (100 ns) and from free energy calculations, we determine how the density of FA molecules on the TiO2 NP and the presence of PEG spacers impact on the actual exposure of the ligands, especially by affecting the extent of FA-FA intermolecular interactions, which are detrimental for the targeting ability of FA towards the folate receptor. This analysis provides a solid and rational basis for experimentalists to define the optimal FA density and the more appropriate mode of anchoring to the carrier, according to the final purpose of the nanoconjugate.
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Affiliation(s)
- Edoardo Donadoni
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
| | - Paulo Siani
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
| | - Giulia Frigerio
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
| | - Cristiana Di Valentin
- Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
- BioNanoMedicine Center NANOMIB, University of Milano-Bicocca, Italy
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13
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Siani P, Frigerio G, Donadoni E, Di Valentin C. Molecular dynamics simulations of cRGD-conjugated PEGylated TiO 2 nanoparticles for targeted photodynamic therapy. J Colloid Interface Sci 2022; 627:126-141. [PMID: 35842963 DOI: 10.1016/j.jcis.2022.07.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 07/05/2022] [Accepted: 07/07/2022] [Indexed: 12/20/2022]
Abstract
The conjugation of high-affinity cRGD-containing peptides is a promising approach in nanomedicine to efficiently reduce off-targeting effects and enhance the cellular uptake by integrin-overexpressing tumor cells. Herein we utilize atomistic molecular dynamics simulations to evaluate key structural-functional parameters of these targeting ligands for an effective binding activity towards αVβ3 integrins. An increasing number of cRGD ligands is conjugated to PEG chains grafted to highly curved TiO2 nanoparticles to unveil the impact of cRGD density on the ligand's presentation, stability, and conformation in an explicit aqueous environment. We find that a low density leads to an optimal spatial presentation of cRGD ligands out of the "stealth" PEGylated layer around the nanosystem, favoring a straight upward orientation and spaced distribution of the targeting ligands in the bulk-water phase. On the contrary, high densities favor over-clustering of cRGD ligands, driven by a concerted mechanism of enhanced ligand-ligand interactions and reduced water accessibility over the ligand's molecular surface. These findings strongly suggest that the ligand density modulation is a key factor in the design of cRGD-targeting nanodevices to maximize their binding efficiency into over-expressed αVβ3 integrin receptors.
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Affiliation(s)
- Paulo Siani
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Giulia Frigerio
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Edoardo Donadoni
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Cristiana Di Valentin
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy; BioNanoMedicine Center NANOMIB, University of Milano-Bicocca, Italy.
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14
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Ezquerro CS, Aznar JMG, Laspalas M. Prediction of the structure and mechanical properties of polycaprolactone-silica nanocomposites and the interphase region by molecular dynamics simulations: the effect of PEGylation. SOFT MATTER 2022; 18:2800-2813. [PMID: 35319045 DOI: 10.1039/d1sm01794b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Polymer/silica (PS) nanocomposites are, among numerous combinations of inorganic/organic nanocomposites, one of the most important materials reported in the literature and have been employed in a wide variety of applications. Due to this great interest in the scientific and industry community, knowledge about their physiochemistry allows for a better understanding of their development and improvement. One area of interest found in biopolymers is silica, where silica nanoparticles can be used to increase their mechanical properties and give them higher opportunities to replace synthetic plastics. With this aim in mind, molecular dynamics (MD) simulations were used to predict the structure and mechanical properties of the interphase region and nanocomposite systems of polycaprolactone (PCL), a common poly(hydroxy acid) type biopolymer, reinforced with silica nanoparticles. Two types of nanoparticles were studied to assess the effect of PEGylation: hydroxyl (ungrafted) and polyethylene glycol (PEG) (grafted or PEGylated) functionalized silica. The interaction energy between the nanoparticle and the polymeric matrix was determined, showing an increase of the affinity between each component due to the PEGylation of the nanoparticle. Through the analysis of polymer density profiles, the structure and thickness of the interphase region were determined, and it was observed that PEGylation increased the interphase thickness from 10.80 Å to 13.04 Å while it decreased the peak and average polymer density of the interphase region. Using compressed and expanded molecular models of the neat PCL polymer, the mechanical properties of the interphase region were related to its density through an interpolation model, and mechanical property profiles were obtained, from which the average values of the Young's modulus, Poisson's ratio and shear modulus of the interphase region were calculated. Finally, the mechanical properties of the nanocomposites were determined by molecular mechanics simulations, showing that the silica nanoparticles increased the stiffness of the composite system to about 7-8% with respect to that of the neat polymer, having a 2.09% weight of bare silica or 2.82% weight of PEGylated silica. PEGylation did not show an additional effect on the overall mechanical properties. A mean field micromechanics model (Mori-Tanaka) corroborated the properties calculated for the interphase region using MD simulations. It was concluded that the PEGylation of the nanoparticle improved the affinity, and thus the dispersion, of the silica nanoparticles towards the PCL matrix, but with no further increase in the mechanical properties of the composite.
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Affiliation(s)
| | | | - Manuel Laspalas
- Aragon Institute of Technology ITAINNOVA, María de Luna 7-8, Zaragoza 50018, Spain.
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15
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Yu XT, Sui SY, He YX, Yu CH, Peng Q. Nanomaterials-based photosensitizers and delivery systems for photodynamic cancer therapy. BIOMATERIALS ADVANCES 2022; 135:212725. [PMID: 35929205 DOI: 10.1016/j.bioadv.2022.212725] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 02/18/2022] [Accepted: 02/18/2022] [Indexed: 12/12/2022]
Abstract
The increasing cancer morbidity and mortality requires the development of high-efficiency and low-toxicity anticancer approaches. In recent years, photodynamic therapy (PDT) has attracted much attention in cancer therapy due to its non-invasive features and low side effects. Photosensitizer (PS) is one of the key factors of PDT, and its successful delivery largely determines the outcome of PDT. Although a few PS molecules have been approved for clinical use, PDT is still limited by the low stability and poor tumor targeting capacity of PSs. Various nanomaterial systems have shown great potentials in improving PDT, such as metal nanoparticles, graphene-based nanomaterials, liposomes, ROS-sensitive nanocarriers and supramolecular nanomaterials. The small molecular PSs can be loaded in functional nanomaterials to enhance the PS stability and tumor targeted delivery, and some functionalized nanomaterials themselves can be directly used as PSs. Herein, we aim to provide a comprehensive understanding of PDT, and summarize the recent progress of nanomaterials-based PSs and delivery systems in anticancer PDT. In addition, the concerns of nanomaterials-based PDT including low tumor targeting capacity, limited light penetration, hypoxia and nonspecific protein corona formation are discussed. The possible solutions to these concerns are also discussed.
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Affiliation(s)
- Xiao-Tong Yu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Shang-Yan Sui
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Yu-Xuan He
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Chen-Hao Yu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Qiang Peng
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
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16
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Khosroshahi R, Tehrani NA, Forouzandeh M, Behrouznejad F, Taghavinia N, Bagherzadeh M. Engineering of CIGS nanoparticle inks for colloidal stability, uniform film formation and application as HTL for perovskite solar cells. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2021.10.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Li X, Xi D, Zhang Z, Long S, Chen P, Du J, Sun W, Fan J, Peng X. Light‐triggered dePEGylation with decreasing the diameter of hydroxyapatite nanocarriers for enhanced cellular uptake and tumor penetration. NANO SELECT 2021. [DOI: 10.1002/nano.202100072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Xiaojing Li
- State Key Laboratory of Fine Chemicals Dalian University of Technology No. 2 linggong Road Dalian 116024 China
| | - Dongmei Xi
- State Key Laboratory of Fine Chemicals Dalian University of Technology No. 2 linggong Road Dalian 116024 China
| | - Zhen Zhang
- State Key Laboratory of Fine Chemicals Dalian University of Technology No. 2 linggong Road Dalian 116024 China
| | - Saran Long
- State Key Laboratory of Fine Chemicals Dalian University of Technology No. 2 linggong Road Dalian 116024 China
- Ningbo Institute of Dalian University of Technology Jiangbei District Ningbo 315016 China
| | - Pengzhong Chen
- State Key Laboratory of Fine Chemicals Dalian University of Technology No. 2 linggong Road Dalian 116024 China
- Ningbo Institute of Dalian University of Technology Jiangbei District Ningbo 315016 China
| | - Jianjun Du
- State Key Laboratory of Fine Chemicals Dalian University of Technology No. 2 linggong Road Dalian 116024 China
- Ningbo Institute of Dalian University of Technology Jiangbei District Ningbo 315016 China
| | - Wen Sun
- State Key Laboratory of Fine Chemicals Dalian University of Technology No. 2 linggong Road Dalian 116024 China
- Ningbo Institute of Dalian University of Technology Jiangbei District Ningbo 315016 China
| | - Jiangli Fan
- State Key Laboratory of Fine Chemicals Dalian University of Technology No. 2 linggong Road Dalian 116024 China
- Ningbo Institute of Dalian University of Technology Jiangbei District Ningbo 315016 China
| | - Xiaojun Peng
- State Key Laboratory of Fine Chemicals Dalian University of Technology No. 2 linggong Road Dalian 116024 China
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18
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Willinger M, Reimhult E. Thermoresponsive Nanoparticles with Cyclic-Polymer-Grafted Shells Are More Stable than with Linear-Polymer-Grafted Shells: Effect of Polymer Topology, Molecular Weight, and Core Size. J Phys Chem B 2021; 125:7009-7023. [PMID: 34156854 PMCID: PMC8279546 DOI: 10.1021/acs.jpcb.1c00142] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 05/26/2021] [Indexed: 11/27/2022]
Abstract
Polymer brush-grafted superparamagnetic iron oxide nanoparticles can change their aggregation state in response to temperature and are potential smart materials for many applications. Recently, the shell morphology imposed by grafting to a nanoparticle core was shown to strongly influence the thermoresponsiveness through a coupling of intrashell solubility transitions and nanoparticle aggregation. We investigate how a change from linear to cyclic polymer topology affects the thermoresponsiveness of poly(2-isopropyl-2-oxazoline) brush-grafted superparamagnetic iron oxide nanoparticles. Linear and cyclic polymers with three different molecular weights (7, 18, and 24.5 kg mol-1) on two different core sizes (3.7 and 9.2 nm) and as free polymer were investigated. We observed the critical flocculation temperature (CFT) during temperature cycling dynamic light scattering experiments, the critical solution temperature (CST), and the transition enthalpy per monomer during differential scanning calorimetry measurements. When all conditions are identical, cyclic polymers increase the colloidal stability and the critical flocculation temperature compared to their linear counterparts. Furthermore, the cyclic polymer shows only one uniform transition, while we observe multiple transitions for the linear polymer shells. We link the single transition and higher colloidal stability to the absence in cyclic PiPrOx shells of a dilute outer part where the particle shells can interdigitate.
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Affiliation(s)
- Max Willinger
- Institute for Biologically Inspired
Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences Vienna, Muthgasse 11, 1190 Vienna, Austria
| | - Erik Reimhult
- Institute for Biologically Inspired
Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences Vienna, Muthgasse 11, 1190 Vienna, Austria
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19
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Shi L, Zhang J, Zhao M, Tang S, Cheng X, Zhang W, Li W, Liu X, Peng H, Wang Q. Effects of polyethylene glycol on the surface of nanoparticles for targeted drug delivery. NANOSCALE 2021; 13:10748-10764. [PMID: 34132312 DOI: 10.1039/d1nr02065j] [Citation(s) in RCA: 246] [Impact Index Per Article: 82.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The rapid development of drug nanocarriers has benefited from the surface hydrophilic polymers of particles, which has improved the pharmacokinetics of the drugs. Polyethylene glycol (PEG) is a kind of polymeric material with unique hydrophilicity and electrical neutrality. PEG coating is a crucial factor to improve the biophysical and chemical properties of nanoparticles and is widely studied. Protein adherence and macrophage removal are effectively relieved due to the existence of PEG on the particles. This review discusses the PEGylation methods of nanoparticles and related techniques that have been used to detect the PEG coverage density and thickness on the surface of the nanoparticles in recent years. The molecular weight (MW) and coverage density of the PEG coating on the surface of nanoparticles are then described to explain the effects on the biophysical and chemical properties of nanoparticles.
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Affiliation(s)
- Liwang Shi
- Department of Pharmaceutics, Daqing Campus of Harbin Medical University, 1 Xinyang Rd., Daqing 163319, China.
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20
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Ibrahim SM, Yin TY, Misran M. Arabic Gum Grafted PEGDMA Hydrogels: Synthesis, Physico-Chemical Characterization and In-vitro Release of Hydrophobic Drug. Macromol Res 2021. [DOI: 10.1007/s13233-020-8166-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Siani P, Motta S, Ferraro L, Dohn AO, Di Valentin C. Dopamine-Decorated TiO 2 Nanoparticles in Water: A QM/MM vs an MM Description. J Chem Theory Comput 2020; 16:6560-6574. [PMID: 32880452 PMCID: PMC7735700 DOI: 10.1021/acs.jctc.0c00483] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
![]()
Nanoparticle functionalization
is a modern strategy in nanotechnology
to build up devices for several applications. Modeling fully decorated
metal oxide nanoparticles of realistic size (few nanometers) in an
aqueous environment is a challenging task. In this work, we present
a case study relevant for solar-light exploitation and for biomedical
applications, i.e., a dopamine-functionalized TiO2 nanoparticle
(1700 atoms) in bulk water, for which we have performed an extensive
comparative investigation with both MM and QM/MM approaches of the
structural properties and of the conformational dynamics. We have
used a combined multiscale protocol for a more efficient exploration
of the complex conformational space. On the basis of the results of
this study and of some QM and experimental data, we have defined strengths
and limitations of the existing force field parameters. Our findings
will be useful for an improved modeling and simulation of many other
similar hybrid bioinorganic nanosystems in an aqueous environment
that are pivotal in a broad range of nanotechnological applications.
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Affiliation(s)
- Paulo Siani
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Via Cozzi 55, 20125 Milano, Italy
| | - Stefano Motta
- Dipartimento di Scienze dell'Ambiente e della Terra, Università di Milano Bicocca, Piazza della Scienza 1, 20126 Milano, Italy
| | - Lorenzo Ferraro
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Via Cozzi 55, 20125 Milano, Italy
| | - Asmus O Dohn
- Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark.,Faculty of Physical Sciences and Science Institute, University of Iceland, 107 Reykjavík, Iceland
| | - Cristiana Di Valentin
- Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Via Cozzi 55, 20125 Milano, Italy
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22
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Dahal U, Dormidontova EE. Chain Conformation and Hydration of Polyethylene Oxide Grafted to Gold Nanoparticles: Curvature and Chain Length Effect. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01499] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Udaya Dahal
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Elena E. Dormidontova
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
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23
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Li X, Sun W, Zhang Z, Kang Y, Fan J, Peng X. Red Light-Triggered Polyethylene Glycol Deshielding from Photolabile Cyanine-Modified Mesoporous Silica Nanoparticles for On-Demand Drug Release. ACS APPLIED BIO MATERIALS 2020; 3:8084-8093. [DOI: 10.1021/acsabm.0c01160] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Xiaojing Li
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Wen Sun
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
- Ningbo Institute of Dalian University of Technology, Ningbo 315016, China
| | - Zhen Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Yao Kang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Jiangli Fan
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
- Ningbo Institute of Dalian University of Technology, Ningbo 315016, China
| | - Xiaojun Peng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
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24
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Balog S. Hydrodynamic Radius of Polymer-Coated Nanoparticles Measured by Taylor Dispersion: A Mathematical Model. Anal Chem 2020; 92:10693-10699. [PMID: 32567303 DOI: 10.1021/acs.analchem.0c01837] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This theoretical work addresses the characterization of polymer-coated nanoparticles via the analysis of Taylor dispersion experiments. Our focus is on determining the apparent hydrodynamic radius and the related accuracy bias, which results from polydispersity and optical-absorption-weighted averages. To that end, we construct a statistical model addressing joint distributions of particle core size and ligand surface density, which determine the hydrodynamic radius and optical absorption of such nanoparticles. Our model predicts that a polymer shell that is thick compared with the core radius results in a smaller bias than a thin shell, and the bias may become even negative when ligand surface density is sufficiently high.
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Affiliation(s)
- Sandor Balog
- University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
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25
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Shen X, Sun X, Liu J, Hang J, Jin L, Shi L. A facile strategy to achieve monodispersity and stability of pigment TiO 2 particles in low viscosity systems. J Colloid Interface Sci 2020; 581:586-594. [PMID: 32814186 DOI: 10.1016/j.jcis.2020.07.132] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 06/29/2020] [Accepted: 07/27/2020] [Indexed: 11/27/2022]
Abstract
Stable dispersion of TiO2 particle is very desirable for its practical applications in various fields. It is a big challenge to stabilize pigment TiO2 with relatively large size (200-300 nm) in low viscosity (~10 cP) systems. In the current work, we introduced a general strategy using a hydrophobic-hydrophilic structure to achieve single-dispersed TiO2 particles with long storage stability in low viscosity systems. The modified TiO2 particles (~250 nm) can be re-dispersed into water/glycol ethers mixture to form single dispersed suspension without any additives. Our study shows that the dispersion can be stable at least 60 days at room temperature and the rheological property is similar to the Newtonian fluids showing an extremely low yield stress at relatively high solid concentration. This work is expected to introduce a new strategy to improve the dispersion stability of the large size nanoparticles in low viscosity systems.
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Affiliation(s)
- Xiaoyao Shen
- Nano-Science & Technology Center, Shanghai University, Shanghai 200444, PR China; College of Sciences, Shanghai University, Shanghai 200444, PR China
| | - Xiaoying Sun
- Nano-Science & Technology Center, Shanghai University, Shanghai 200444, PR China; College of Sciences, Shanghai University, Shanghai 200444, PR China.
| | - Jing Liu
- Nano-Science & Technology Center, Shanghai University, Shanghai 200444, PR China; College of Sciences, Shanghai University, Shanghai 200444, PR China
| | - Jianzhong Hang
- Nano-Science & Technology Center, Shanghai University, Shanghai 200444, PR China; College of Sciences, Shanghai University, Shanghai 200444, PR China.
| | - Lujiang Jin
- Nano-Science & Technology Center, Shanghai University, Shanghai 200444, PR China; College of Sciences, Shanghai University, Shanghai 200444, PR China
| | - Liyi Shi
- Nano-Science & Technology Center, Shanghai University, Shanghai 200444, PR China; College of Sciences, Shanghai University, Shanghai 200444, PR China.
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26
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Liu X, Drakontis C, Amin S. Designing high-performance colour cosmetics through optimization of powder flow characteristics. Int J Cosmet Sci 2020; 42:208-216. [PMID: 32043605 DOI: 10.1111/ics.12608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 02/06/2020] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Explore the impact of powder flow properties such as flow energy and compressibility on the performance characteristics of foundation powders such as cake strength and pay-off. METHODS FT4 Powder Rheometer from Freeman Technology was utilized to explore various powder compositions. The three major tests performed were flowability test, compressibility test and shear cell test. RESULTS The results highlight that the sample which has higher compressibility has the better cake strength, and the sample which requires lower total energy has better pay-off. Particles or samples with lower total flow energy, should have easier flow, therefore, should have better pay-off. Samples and components with higher compressibility, should hold the structure better, therefore, should have better cake strength. Talc has the highest compressibility and lowest flow energy. Foundation sample 5 has the highest concentration of talc and also has the best performance. CONCLUSION The lower the total flow energy, the easier it is for the powder to flow, and have better pay-off. Powder compressibility correlates with cake strength which means that a sample with better compressibility consequently has the better cake strength. Samples 5 and 10 require less total flow energy, have lower shear stress, and higher compressibility, therefore, have better final performance. Both samples 5 and 10 have higher talc concentrations compared to other formulations.
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Affiliation(s)
- X Liu
- Chemical Engineering Department, Manhattan College, 4513 Manhattan College Parkway, Riverdale, NY, 10471, USA
| | - C Drakontis
- Chemical Engineering Department, Manhattan College, 4513 Manhattan College Parkway, Riverdale, NY, 10471, USA
| | - S Amin
- Chemical Engineering Department, Manhattan College, 4513 Manhattan College Parkway, Riverdale, NY, 10471, USA
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27
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Selli D, Tawfilas M, Mauri M, Simonutti R, Di Valentin C. Optimizing PEGylation of TiO 2 Nanocrystals through a Combined Experimental and Computational Study. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2019; 31:7531-7546. [PMID: 31875864 PMCID: PMC6924593 DOI: 10.1021/acs.chemmater.9b02329] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 08/08/2019] [Indexed: 05/21/2023]
Abstract
PEGylation of metal oxide nanoparticles is the common approach to improve their biocompatibility and in vivo circulation time. In this work, we present a combined experimental and theoretical study to determine the operating condition that guarantee very high grafting densities, which are desirable in any biomedical application. Moreover, we present an insightful conformational analysis spanning different coverage regimes and increasing polymer chain lengths. Based on 13C NMR measurements and molecular dynamics simulations, we show that classical and popular models of polymer conformation on surfaces fail in determining the mushroom-to-brush transition point and prove that it actually takes place only at rather high grafting density values.
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Affiliation(s)
- Daniele Selli
- Dipartimento di Scienza dei
Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Massimo Tawfilas
- Dipartimento di Scienza dei
Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Michele Mauri
- Dipartimento di Scienza dei
Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Roberto Simonutti
- Dipartimento di Scienza dei
Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Cristiana Di Valentin
- Dipartimento di Scienza dei
Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
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