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Wang S, Ding Z, Wang S, Hu B, Wu E, Xia C, Chen M. Approaching Effective Differential Centrifugal Fractionation by Combining Image Analysis with Analytical Ultracentrifugation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:2191-2197. [PMID: 38234120 DOI: 10.1021/acs.langmuir.3c03161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
Centrifugation is one of the most commonly used methods for separation in biology and chemistry. However, effective fractionation is not always easy to obtain, as preparative centrifuge experiments are mostly conducted in an empirical way, even when it is guided by the quantitative results from analytical ultracentrifuge (AUC). Very few works have been performed to enhance the fractionation resolution of the differential centrifugation method in a swing-out rotor. This is primarily due to the absence of a characterization tool for sedimentation in the preparative centrifuge. In this study, we utilized image analysis to map the particle concentration distribution throughout the preparative centrifuge tube, revealing an unexpected and abnormal sedimentation process. By characterizing the sedimentation coefficient distributions of the fractionated product via AUC, we demonstrated that the overall sedimentation efficiency in a swing-out preparative centrifuge was significantly reduced. Furthermore, effective fractionation was confined to the intermediate phase of the entire sedimentation process. We propose that the mechanism here is a combination of the inverse Boycott effect and droplet sedimentation. The actual sedimentation process within a preparative centrifuge can be described by modifying the Lamm equation phenomenologically, which simply results in an effective sedimentation coefficient. Our work builds a foundation for determining the optimal preparative centrifugation conditions for various systems.
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Affiliation(s)
- Shuaike Wang
- State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, 3663 N. Zhongshan Rd., Shanghai 200062, China
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, 3663 N. Zhongshan Rd., Shanghai 200062, China
| | - Zhaoyang Ding
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, 3663 N. Zhongshan Rd., Shanghai 200062, China
| | - Shaoyan Wang
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, 3663 N. Zhongshan Rd., Shanghai 200062, China
| | - Bingwen Hu
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, 3663 N. Zhongshan Rd., Shanghai 200062, China
| | - E Wu
- State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, 3663 N. Zhongshan Rd., Shanghai 200062, China
| | - Chengjie Xia
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, 3663 N. Zhongshan Rd., Shanghai 200062, China
| | - Mengdi Chen
- State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, 3663 N. Zhongshan Rd., Shanghai 200062, China
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Onyilagha JC, Omenyi SN, Snyder RS. Application of some droplet sedimentation theories to layered erythrocyte suspensions. CELL BIOPHYSICS 1989; 14:217-30. [PMID: 2472209 DOI: 10.1007/bf02797269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The applicability of some existing droplet sedimentation theories to erythrocyte suspensions was investigated using glutaraldehyde-fixed erythrocytes from horse, canine, pig, chicken, and human. The Svensson criteria were shown to underestimate the load supportable by a density gradient. The available theories on droplet formation times could not predict each other, and the data on erythrocyte suspensions, especially at high suspension concentrations. It was finally argued that, since the behavior of erythrocytes was not controlled by the diffusion process, the erythrocyte suspensions were not expected to exhibit lasting or absolute stability even when the particle load was small.
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Affiliation(s)
- J C Onyilagha
- Department of Applied Biology, Anambra State University of Technology, Enugu, Nigeria
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Halsall HB. Analytical Differential Centrifugation as a Precise Biophysical Tool. SEP SCI TECHNOL 1981. [DOI: 10.1080/01496398108068525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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