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Wills JW, Summers HD, Hondow N, Sooresh A, Meissner KE, White PA, Rees P, Brown A, Doak SH. Characterizing Nanoparticles in Biological Matrices: Tipping Points in Agglomeration State and Cellular Delivery In Vitro. ACS NANO 2017; 11:11986-12000. [PMID: 29072897 DOI: 10.1021/acsnano.7b03708] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Understanding the delivered cellular dose of nanoparticles is imperative in nanomedicine and nanosafety, yet is known to be extremely complex because of multiple interactions between nanoparticles, their environment, and the cells. Here, we use 3-D reconstruction of agglomerates preserved by cryogenic snapshot sampling and imaged by electron microscopy to quantify the "bioavailable dose" that is presented at the cell surface and formed by the process of individual nanoparticle sequestration into agglomerates in the exposure media. Critically, using 20 and 40 nm carboxylated polystyrene-latex and 16 and 85 nm silicon dioxide nanoparticles, we show that abrupt, dose-dependent "tipping points" in agglomeration state can arise, subsequently affecting cellular delivery and increasing toxicity. These changes are triggered by shifts in the ratio of the total nanoparticle surface area to biomolecule abundance, with the switch to a highly agglomerated state effectively changing the test article midassay, challenging the dose-response paradigm for nanosafety experiments. By characterizing nanoparticle numbers per agglomerate, we show these tipping points can lead to the formation of extreme agglomeration states whereby 90% of an administered dose is contained and delivered to the cells by just the top 2% of the largest agglomerates. We thus demonstrate precise definition, description, and comparison of the nanoparticle dose formed in different experimental environments and show that this description is critical to understanding cellular delivery and toxicity. We further empirically "stress-test" the commonly used dynamic light scattering approach, establishing its limitations to present an analysis strategy that significantly improves the usefulness of this popular nanoparticle characterization technique.
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Affiliation(s)
- John W Wills
- Institute of Life Sciences, Swansea University Medical School , Singleton Park, Swansea, SA2 8PP, U.K
| | - Huw D Summers
- Centre for Nanohealth, Swansea University College of Engineering , Fabian Way, Crymlyn Burrows, Swansea, SA1 8EN, U.K
| | - Nicole Hondow
- School of Chemical and Process Engineering, University of Leeds , Leeds, LS2 9JT, U.K
| | - Aishwarya Sooresh
- Department of Materials Science and Engineering, Texas A&M University , College Station, Texas 77843, United States
| | - Kenith E Meissner
- Department of Biomedical Engineering, Texas A&M University , College Station, Texas 77843, United States
- Department of Physics, Swansea University College of Science , Singleton Park, Swansea, SA2 8PP, U.K
| | - Paul A White
- Department of Biology, University of Ottawa , 30 Marie-Curie Private, Ottawa K1N 9B4, Ontario, Canada
| | - Paul Rees
- Centre for Nanohealth, Swansea University College of Engineering , Fabian Way, Crymlyn Burrows, Swansea, SA1 8EN, U.K
- Broad Institute of MIT and Harvard , 415 Main Street, Cambridge, Massachusetts 02142, United States
| | - Andy Brown
- School of Chemical and Process Engineering, University of Leeds , Leeds, LS2 9JT, U.K
| | - Shareen H Doak
- Institute of Life Sciences, Swansea University Medical School , Singleton Park, Swansea, SA2 8PP, U.K
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BRYDSON R, BROWN A, HODGES C, ABELLAN P, HONDOW N. Microscopy of nanoparticulate dispersions. J Microsc 2015; 260:238-47. [DOI: 10.1111/jmi.12290] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 06/22/2015] [Indexed: 01/08/2023]
Affiliation(s)
- R. BRYDSON
- Institute for Materials Research; School of Chemical and Process Engineering, University of Leeds; Leeds U.K
- Super STEM Laboratory; STFC Daresbury Campus; Daresbury U.K
| | - A. BROWN
- Institute for Materials Research; School of Chemical and Process Engineering, University of Leeds; Leeds U.K
| | - C. HODGES
- Escubed Ltd; Leeds Innovation Centre; 103 Clarendon Road Leeds U.K
| | - P. ABELLAN
- Super STEM Laboratory; STFC Daresbury Campus; Daresbury U.K
| | - N. HONDOW
- Institute for Materials Research; School of Chemical and Process Engineering, University of Leeds; Leeds U.K
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Ngamchuea K, Tschulik K, Eloul S, Compton RG. In Situ Detection of Particle Aggregation on Electrode Surfaces. Chemphyschem 2015; 16:2338-47. [DOI: 10.1002/cphc.201500168] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 04/27/2015] [Indexed: 11/09/2022]
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Liu Q, Zhang M, Fang ZX, Rong XH. Effects of ZnO nanoparticles and microwave heating on the sterilization and product quality of vacuum-packaged Caixin. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2014; 94:2547-2554. [PMID: 24464779 DOI: 10.1002/jsfa.6594] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 11/11/2013] [Accepted: 01/17/2014] [Indexed: 06/03/2023]
Abstract
BACKGROUND The sterilization of vacuum-packaged Caixin (Brassica chinensis L.), which is a green-leafy vegetable and also a low-acid food, remains a difficult problem. In this study, effects of ZnO nanoparticles and microwave heating on the sterilization and product quality of vacuum-packaged Caixin were investigated. RESULTS Addition of ZnO nanoparticle suspension at 0.01-0.02 g kg(-1) reduced the number of bacterial colonies. The antibacterial activity was enhanced with the increased amount of ZnO nanoparticles. Microwave heating (915 and 2450 MHz) was used to sterilize Caixin samples. Samples had good product quality (better greenness, chroma and hue angle values, lower browning index and acceptable texture) and the lowest total colony number under the microwave heating condition of 400 W 150 s (2450 MHz). CONCLUSION The best sterilization condition was observed under 2450 MHz microwave (400 W 150 s) heating combined with 0.02 g kg(-1) ZnO nanoparticle addition, which led to a total colony number of <1 log CFU g(-1) in Caixin samples within 7 days.
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Affiliation(s)
- Qian Liu
- State Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 214122, Wuxi, Jiangsu, China
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