1
|
Dai S, Zhang W, Dou Y, Liu H, Chen X, Shi J, Dou H. Towards a better understanding of the relationships between the structure and antitumor activity of Gastrodia elata polysaccharides by asymmetrical flow field-flow fractionation. Food Res Int 2021; 149:110673. [PMID: 34600675 DOI: 10.1016/j.foodres.2021.110673] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 08/15/2021] [Accepted: 08/24/2021] [Indexed: 11/17/2022]
Abstract
To better understand the structure-function relationship of Gastrodia elata polysaccharides (PGEs), PGEs were extracted by ultrasound-assisted extraction method and the effects of extraction time on the structure and conformation of PGEs were evaluated by asymmetrical flow field-flow fractionation (AF4) coupled online with multiangle light scattering (MALS) and differential refractive index (dRI) detectors (AF4-MALS-dRI). Besides separation, AF4-MALS-dRI can provide more information about PGEs, such as size and molecular weight (Mw) distributions, apparent density, and conformation. The effects of PGEs on the proliferation, apoptosis, and cell cycle of MCF-7 cells were investigated. The cell activity assay indicated that the PGEs can inhibit the growth of MCF-7 cells by inducing late apoptosis. The results indicated that PGEs with a spherical conformation and compact structure seem to be beneficial to inducing MCF-7 cells late apoptosis. Moreover, results demonstrated that the information obtained by AF4-MALS-dRI is valuable for better understanding of the relationship of structure-activity of PGEs.
Collapse
Affiliation(s)
- Shanshan Dai
- Key Laboratory of Pathogenesis Mechanism and Control of Inflammatory-Autoimmune Disease of Hebei Province, School of Basic Medical Sciences, Hebei University, Baoding 071000, China
| | - Wenhui Zhang
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Key Laboratory of Analytical Science and Technology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
| | - Yuwei Dou
- Key Laboratory of Pathogenesis Mechanism and Control of Inflammatory-Autoimmune Disease of Hebei Province, School of Basic Medical Sciences, Hebei University, Baoding 071000, China
| | - Hongmei Liu
- Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Key Laboratory of Analytical Science and Technology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
| | - Xue Chen
- Key Laboratory of Pathogenesis Mechanism and Control of Inflammatory-Autoimmune Disease of Hebei Province, School of Basic Medical Sciences, Hebei University, Baoding 071000, China
| | - Jianhong Shi
- Affiliated Hospital of Hebei University, Baoding 071000, China
| | - Haiyang Dou
- Key Laboratory of Pathogenesis Mechanism and Control of Inflammatory-Autoimmune Disease of Hebei Province, School of Basic Medical Sciences, Hebei University, Baoding 071000, China; Affiliated Hospital of Hebei University, Baoding 071000, China.
| |
Collapse
|
2
|
Analysis of celluloses, plant holocelluloses, and wood pulps by size-exclusion chromatography/multi-angle laser-light scattering. Carbohydr Polym 2021; 251:117045. [PMID: 33142603 DOI: 10.1016/j.carbpol.2020.117045] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 08/07/2020] [Accepted: 08/31/2020] [Indexed: 11/23/2022]
Abstract
Size-exclusion chromatography with multi-angle laser-light scattering and refractive index detection (SEC/MALLS/RI) provides the number- and weight-average molar masses, molar mass distributions, conformations, and linear/branched structures of polymers. In the case of pure celluloses including highly crystalline tunicate and alga celluloses, and hemicellulose-rich plant holocelluloses, soaking in ethylene diamine (EDA) and subsequent solvent exchange to N,N-dimethylacetamide (DMAc) though methanol is effective for complete dissolution in ∼8% (w/w) LiCl/DMAc. SEC/MALLS/RI analysis can, therefore, be applied to pure celluloses, chemical wood pulps, and plant holocelluloses after dissolution in ∼8% (w/w) LiCl/DMAc, dilution to 1% (w/v) LiCl/DMAc and membrane filtration. All pure celluloses and the high-molar-mass cellulose fractions of hardwood and grass holocelluloses have linear and random-coil conformations and various average molar masses and molar mass distributions depending on the cellulose and holocellulose resources. In contrast, Japanese cedar (i.e., softwood) holocellulose and softwood bleached kraft pulp have alkali-stable cellulose/glucomannan branched structures in the high-molar-mass fractions.
Collapse
|
3
|
Nischwitz V, Gottselig N, Braun M. Preparative field flow fractionation for complex environmental samples: online detection by inductively coupled plasma mass spectrometry and offline detection by gas chromatography with flame ionization. J Chromatogr A 2020; 1632:461581. [DOI: 10.1016/j.chroma.2020.461581] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 09/20/2020] [Accepted: 09/21/2020] [Indexed: 10/23/2022]
|
4
|
Ivaneev AI, Faucher S, Ermolin MS, Karandashev VK, Fedotov PS, Lespes G. Separation of nanoparticles from polydisperse environmental samples: comparative study of filtration, sedimentation, and coiled tube field-flow fractionation. Anal Bioanal Chem 2019; 411:8011-8021. [PMID: 31781812 DOI: 10.1007/s00216-019-02147-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/20/2019] [Accepted: 09/09/2019] [Indexed: 01/04/2023]
Abstract
Nanoparticles (NPs) in the environment have a potential risk for human health and the ecosystem due to their ubiquity, specific characteristics, and properties (extreme mobility in the environment, abilities to accumulate of toxic elements and penetrate into living organisms). There is still a gap in studies on the chemical composition of natural NPs. The main reason is the difficulty to recover NPs, which may represent only one-thousandth or less of the bulk environmental sample, for further dimensional and quantitative characterization. In the present study, a methodology for the recovery of the nanoparticle fraction from polydisperse environmental samples was developed taking as example volcanic ashes from different regions of the world. For the first time, three separation methods, namely, filtration through a 0.45-μm membrane, sedimentation, and coiled tube field-flow fractionation (CTFFF), were comparatively studied. The separated fractions were characterized by laser diffraction and scanning electron microscopy and then analyzed by inductively coupled plasma atomic emission and mass spectrometry. It has been shown that all three methods provide the separation of NPs less than 400 nm from the bulk material. However, the fraction separated by sedimentation also contained a population (5% in mass) of submicron particles (~ 400-900 nm). The filtration resulted in low recovery of NPs. The determination of most trace elements was then impossible; the concentration of elements was under the limit of detection of the analytical instrument. The sedimentation and CTFFF made it possible to determine quantifiable concentrations for both major and trace elements in separated fractions. However, the sedimentation took 48 h while CTFFF enabled the fractionation time to be decreased down to 2 h. Hence, CTFFF looked to be the most promising method for the separation of NPs followed by their quantitative elemental analysis.
Collapse
Affiliation(s)
- Alexandr I Ivaneev
- National University of Science and Technology "MISIS", 4 Leninsky Ave, Moscow, Russia, 119991. .,Université de Pau et des Pays de l'Adour (UPPA), Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les matériaux (IPREM), UMR 5254 UPPA/CNRS, 64053, Pau Cedex 9, France. .,Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, Russia, 119991.
| | - Stéphane Faucher
- Université de Pau et des Pays de l'Adour (UPPA), Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les matériaux (IPREM), UMR 5254 UPPA/CNRS, 64053, Pau Cedex 9, France.
| | - Mikhail S Ermolin
- Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, Russia, 119991
| | - Vasily K Karandashev
- Institute of Microelectronics Technology and High-Purity Materials, Russian Academy of Sciences, Chernogolovka, Russia, 142432
| | - Petr S Fedotov
- National University of Science and Technology "MISIS", 4 Leninsky Ave, Moscow, Russia, 119991.,Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, Russia, 119991
| | - Gaëtane Lespes
- Université de Pau et des Pays de l'Adour (UPPA), Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les matériaux (IPREM), UMR 5254 UPPA/CNRS, 64053, Pau Cedex 9, France
| |
Collapse
|
5
|
Zhang X, Li Y, Shen S, Lee S, Dou H. Field-flow fractionation: A gentle separation and characterization technique in biomedicine. Trends Analyt Chem 2018. [DOI: 10.1016/j.trac.2018.09.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
6
|
|
7
|
Duncan TV, Singh G. Nanomaterials in Food Products: A New Analytical Challenge. NANOTECHNOLOGIES IN FOOD 2017. [DOI: 10.1039/9781782626879-00143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
This chapter focuses on the problem of detecting, characterizing, and determining the concentration of nanomaterials in foods and other biological matrices. After providing an overview of the unique challenges associated with nanoparticle metrology in complex media, sample pretreatment methods (including extraction, digestion, and inline chromatographic separation), imaging analysis, and nanomaterial quantification methods are presented in detail. The chapter also addresses numerous methods under development, including atmospheric scanning electron microscopy, single-particle inductively coupled plasma mass spectrometry, immunological detection methods, and optical techniques such surface plasmon resonance. The chapter concludes with an overview of the research needs in this area.
Collapse
Affiliation(s)
- Timothy V. Duncan
- US Food and Drug Administration, Center for Food Safety and Applied Nutrition Bedford Park Illinois USA
| | - Gurmit Singh
- Food Research Division, Bureau of Chemical Safety, Health Canada Ottawa Canada
| |
Collapse
|
8
|
Flow-field mitigation of membrane fouling (FMMF) via manipulation of the convective flow in cross-flow membrane applications. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2016.12.055] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
9
|
Detection of nanocellulose in commercial products and its size characterization using asymmetric flow field-flow fractionation. Mikrochim Acta 2017. [DOI: 10.1007/s00604-017-2106-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
10
|
Menéndez-Miranda M, Encinar JR, Costa-Fernández JM, Sanz-Medel A. Asymmetric flow field-flow fractionation coupled to inductively coupled plasma mass spectrometry for the quantification of quantum dots bioconjugation efficiency. J Chromatogr A 2015; 1422:247-252. [PMID: 26493473 DOI: 10.1016/j.chroma.2015.10.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 09/10/2015] [Accepted: 10/06/2015] [Indexed: 12/14/2022]
Abstract
Hyphenation of asymmetric flow field-flow fractionation (AF4) to an on-line elemental detection (inductively coupled plasma-mass spectrometry, ICP-MS) is proposed as a powerful diagnostic tool for quantum dots bioconjugation studies. In particular, conjugation effectiveness between a "model" monoclonal IgG antibody (Ab) and CdSe/ZnS core-shell Quantum Dots (QDs), surface-coated with an amphiphilic polymer, has been monitored here by such hybrid AF4-ICP-MS technique. Experimental conditions have been optimized searching for a proper separation between the sought bioconjugates from the eventual free reagents excesses employed during the bioconjugation (QDs and antibodies). Composition and pH of the carrier have been found to be critical parameters to ensure an efficient separation while ensuring high species recovery from the AF4 channel. An ICP-MS equipped with a triple quadropole was selected as elemental detector to enable sensitive and reliable simultaneous quantification of the elemental constituents, including sulfur, of the nanoparticulated species and the antibody. The hyphenated technique used provided nanoparticle size-based separation, elemental detection, and composition analysis capabilities that turned out to be instrumental in order to investigate in depth the Ab-QDs bioconjugation process. Moreover, the analytical strategy here proposed allowed us not only to clearly identify the bioconjugation reaction products but also to quantify nanoparticle:antibodies bioconjugation efficiency. This is a key issue in future development of analytical and bioanalytical photoluminescent QDs applications.
Collapse
Affiliation(s)
- Mario Menéndez-Miranda
- Department of Physical and Analytical Chemistry, University of Oviedo, Avda. Julian Claveria 8, E-33006, Oviedo, Spain
| | - Jorge Ruiz Encinar
- Department of Physical and Analytical Chemistry, University of Oviedo, Avda. Julian Claveria 8, E-33006, Oviedo, Spain.
| | - José M Costa-Fernández
- Department of Physical and Analytical Chemistry, University of Oviedo, Avda. Julian Claveria 8, E-33006, Oviedo, Spain.
| | - Alfredo Sanz-Medel
- Department of Physical and Analytical Chemistry, University of Oviedo, Avda. Julian Claveria 8, E-33006, Oviedo, Spain
| |
Collapse
|
11
|
Herrero P, Bäuerlein PS, Emke E, Marcé RM, Voogt PD. Size and concentration determination of (functionalised) fullerenes in surface and sewage water matrices using field flow fractionation coupled to an online accurate mass spectrometer: Method development and validation. Anal Chim Acta 2015; 871:77-84. [DOI: 10.1016/j.aca.2015.02.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 02/11/2015] [Accepted: 02/15/2015] [Indexed: 01/21/2023]
|
12
|
Cascio C, Gilliland D, Rossi F, Calzolai L, Contado C. Critical experimental evaluation of key methods to detect, size and quantify nanoparticulate silver. Anal Chem 2014; 86:12143-51. [PMID: 25393334 DOI: 10.1021/ac503307r] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Different analytical techniques, sedimentation flow field fractionation (SdFFF), asymmetrical flow field flow fractionation (AF4), centrifugal liquid sedimentation (CLS) and dynamic light scattering (DLS) have been used to give complementary size information about suspensions of silver nanoparticles (AgNPs) in the size range of 20-100 nm by taking advantage of the different physical principles on which are based. Particle morphology was controlled by TEM (Transmission Electron Microscopy). Both SdFFF and AF4 were able to accurately size all AgNPs; among sedimentation based techniques, CLS underestimated the average sizes of larger samples (70 and 100 nm), but it produced the best separation of bimodal mixtures Ag40/60 and Ag40/70 mix compared to SdFFF. On the contrary, DLS overestimated the average sizes of the smallest samples (20 and 30 nm) and it was unable to deal with bimodal mixtures. Quantitative mass and number particle size distributions were also calculated starting from UV-vis signals and ICP-MS data and the results evaluated as a means to address the issue of determining nanoparticle size distributions as required for implementation of European regulations relating to labeling of nanomaterials in consumer products. The results are discussed in light of possible particle aggregation state, analysis repeatability, size resolution and quantitative recoveries.
Collapse
Affiliation(s)
- Claudia Cascio
- Institute for Health and Consumer Protection, Joint Research Centre, European Commission , Via E. Fermi 2749, 21027 Ispra (VA), Italy
| | | | | | | | | |
Collapse
|
13
|
Vastamäki P, Williams PS, Jussila M, Martin M, Riekkola ML. Retention in continuous two-dimensional thermal field-flow fractionation: comparison of experimental results with theory. Analyst 2014; 139:116-27. [DOI: 10.1039/c3an01047c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
14
|
Dou H, Lee YJ, Jung EC, Lee BC, Lee S. Study on steric transition in asymmetrical flow field-flow fractionation and application to characterization of high-energy material. J Chromatogr A 2013; 1304:211-9. [DOI: 10.1016/j.chroma.2013.06.051] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2013] [Revised: 06/17/2013] [Accepted: 06/19/2013] [Indexed: 12/24/2022]
|
15
|
Dou H, Kim KH, Lee BC, Choe J, Kim HS, Lee S. Preparation and characterization of cyclo-1,3,5-trimethylene-2,4,6-trinitramine (RDX) powder: Comparison of microscopy, dynamic light scattering and field-flow fractionation for size characterization. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2012.11.042] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
16
|
Bednar A, Poda A, Mitrano D, Kennedy A, Gray E, Ranville J, Hayes C, Crocker F, Steevens J. Comparison of on-line detectors for field flow fractionation analysis of nanomaterials. Talanta 2013; 104:140-8. [DOI: 10.1016/j.talanta.2012.11.008] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Revised: 11/02/2012] [Accepted: 11/07/2012] [Indexed: 11/16/2022]
|
17
|
Wu N, Wyart Y, Liu Y, Rose J, Moulin P. An overview of solid/liquid separation methods and size fractionation techniques for engineered nanomaterials in aquatic environment. ACTA ACUST UNITED AC 2013. [DOI: 10.1080/09593330.2013.788073] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
18
|
Impact of carrier fluid composition on recovery of nanoparticles and proteins in flow field flow fractionation. J Chromatogr A 2012; 1264:72-9. [PMID: 23058938 DOI: 10.1016/j.chroma.2012.09.050] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 09/14/2012] [Accepted: 09/17/2012] [Indexed: 11/20/2022]
Abstract
Flow field flow fractionation (F4) is an invaluable separation tool for large analytes, including nanoparticles and biomolecule complexes. However, sample loss due to analyte-channel membrane interaction limits extensive usage of F4 at present, which could be strongly affected by the carrier fluid composition. This work studied the impacts of carrier fluid (CF) composition on nanoparticle (NP) recovery in F4, with focus on high ionic strength conditions. Successful analysis of NPs in a biomolecules-friendly environment could expand the applicability of F4 to the developing field of nanobiotechnology. Recovery of the unfunctionalized polystyrene NPs of 199, 102, and 45 nm in CFs with various pH (6.2, 7.4 and 8.2), increasing ionic strength (0-0.1M), and different types of co- and counter-ions, were investigated. Additionally, elution of the 85 nm carboxylate NPs and two proteins, human serum albumin (HSA) and immunoglobulin (IgG), at high ionic strengths (0-0.15M) was investigated. Our results suggested that (1) electrostatic repulsion between the negatively charged NPs and the regenerated cellulose membrane was the main force to avoid particle adsorption on the membrane; (2) larger particles experienced higher attractive force and thus were influenced more by variation in CF composition; and (3) buffers containing weak anions or NPs with weak anion as the surface functional groups provided higher tolerance to the increase in ionic strength, owing to more anions being trapped inside the NP porous structure. Protein adsorption onto the membrane was also briefly investigated in salted CFs, using HSA and IgG. We believe our findings could help to identify the basic carrier fluid composition for higher sample recovery in F4 analysis of nanoparticles in a protein-friendly environment, which will be useful for applying F4 in bioassays and in nanotoxicology studies.
Collapse
|
19
|
Guan X, Cueto R, Russo P, Qi Y, Wu Q. Asymmetric Flow Field-Flow Fractionation with Multiangle Light Scattering Detection for Characterization of Cellulose Nanocrystals. Biomacromolecules 2012; 13:2671-9. [DOI: 10.1021/bm300595a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xia Guan
- School of Renewable
Natural Resources and Macromolecular Studies Group, LSU AgCenter, Baton Rouge, Louisiana 70803, United
States
| | - Rafael Cueto
- Department
of Chemistry
and Macromolecular Studies Group, Louisiana State University, Baton Rouge, Louisiana 70803, United
States
| | - Paul Russo
- Department
of Chemistry
and Macromolecular Studies Group, Louisiana State University, Baton Rouge, Louisiana 70803, United
States
| | - Yadong Qi
- Urban
Forestry Program, Southern University, Baton Rouge, Louisiana
70813, United States
| | - Qinglin Wu
- School of Renewable
Natural Resources and Macromolecular Studies Group, LSU AgCenter, Baton Rouge, Louisiana 70803, United
States
| |
Collapse
|
20
|
Schachermeyer S, Ashby J, Zhong W. Advances in field-flow fractionation for the analysis of biomolecules: instrument design and hyphenation. Anal Bioanal Chem 2012; 404:1151-8. [DOI: 10.1007/s00216-012-6069-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 04/02/2012] [Accepted: 04/21/2012] [Indexed: 10/28/2022]
|
21
|
Dubascoux S, Thepchalerm C, Dubreucq E, Wisunthorn S, Vaysse L, Kiatkamjornwong S, Nakason C, Bonfils F. Comparative study of the mesostructure of natural and synthetic polyisoprene by size exclusion chromatography-multi-angle light scattering and asymmetrical flow field flow fractionation-multi-angle light scattering. J Chromatogr A 2012; 1224:27-34. [DOI: 10.1016/j.chroma.2011.12.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Revised: 11/18/2011] [Accepted: 12/01/2011] [Indexed: 10/14/2022]
|
22
|
Santoro A, Terzano R, Medici L, Beciani M, Pagnoni A, Blo G. Colloidal mercury (Hg) distribution in soil samples by sedimentation field-flow fractionation coupled to mercury cold vapour generation atomic absorption spectroscopy. ACTA ACUST UNITED AC 2012; 14:138-45. [DOI: 10.1039/c1em10468c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
23
|
Claveranne-Lamolère C, Aupiais J, Lespes G, Frayret J, Pili E, Pointurier F, Potin-Gautier M. Investigation of uranium–colloid interactions in soil by dual field-flow fractionation/capillary electrophoresis hyphenated with inductively coupled plasma-mass spectrometry. Talanta 2011; 85:2504-10. [DOI: 10.1016/j.talanta.2011.07.100] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 07/26/2011] [Accepted: 07/29/2011] [Indexed: 12/01/2022]
|
24
|
Neubauer E, v.d. Kammer F, Hofmann T. Influence of carrier solution ionic strength and injected sample load on retention and recovery of natural nanoparticles using Flow Field-Flow Fractionation. J Chromatogr A 2011; 1218:6763-73. [DOI: 10.1016/j.chroma.2011.07.010] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Revised: 07/01/2011] [Accepted: 07/05/2011] [Indexed: 11/16/2022]
|
25
|
Bolea E, Jiménez-Lamana J, Laborda F, Castillo JR. Size characterization and quantification of silver nanoparticles by asymmetric flow field-flow fractionation coupled with inductively coupled plasma mass spectrometry. Anal Bioanal Chem 2011; 401:2723-32. [DOI: 10.1007/s00216-011-5201-2] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 05/31/2011] [Accepted: 06/21/2011] [Indexed: 11/29/2022]
|
26
|
Yohannes G, Jussila M, Hartonen K, Riekkola ML. Asymmetrical flow field-flow fractionation technique for separation and characterization of biopolymers and bioparticles. J Chromatogr A 2011; 1218:4104-16. [DOI: 10.1016/j.chroma.2010.12.110] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 12/20/2010] [Accepted: 12/26/2010] [Indexed: 12/17/2022]
|
27
|
Flow field-flow fractionation for the analysis and characterization of natural colloids and manufactured nanoparticles in environmental systems: A critical review. J Chromatogr A 2011; 1218:4078-103. [DOI: 10.1016/j.chroma.2011.04.063] [Citation(s) in RCA: 226] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 04/20/2011] [Accepted: 04/22/2011] [Indexed: 01/23/2023]
|
28
|
Pinto SIS, Miranda JM, Campos JBLM. The Effect of Variable Transport Properties in the Separation of Two Macromolecules by Differential Diffusivity in a Hybrid Membrane Cell – A CFD Study. SEP SCI TECHNOL 2011. [DOI: 10.1080/01496395.2011.580307] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- S. I. S. Pinto
- a Centro de Estudos de Fenómenos de Transporte, Departamento de Eng. Química , Faculdade de Engenharia da Universidade do Porto , Porto , Portugal
| | - J. M. Miranda
- a Centro de Estudos de Fenómenos de Transporte, Departamento de Eng. Química , Faculdade de Engenharia da Universidade do Porto , Porto , Portugal
| | - J. B. L. M. Campos
- a Centro de Estudos de Fenómenos de Transporte, Departamento de Eng. Química , Faculdade de Engenharia da Universidade do Porto , Porto , Portugal
| |
Collapse
|
29
|
|
30
|
Lespes G, Gigault J. Hyphenated analytical techniques for multidimensional characterisation of submicron particles: A review. Anal Chim Acta 2011; 692:26-41. [DOI: 10.1016/j.aca.2011.02.052] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2010] [Revised: 02/21/2011] [Accepted: 02/22/2011] [Indexed: 11/25/2022]
|
31
|
Fractionation and characterization of nano- and microparticles in liquid media. Anal Bioanal Chem 2011; 400:1787-804. [DOI: 10.1007/s00216-011-4704-1] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Revised: 01/17/2011] [Accepted: 01/18/2011] [Indexed: 11/26/2022]
|
32
|
Fractionation and characterization of gold nanoparticles in aqueous solution: asymmetric-flow field flow fractionation with MALS, DLS, and UV–Vis detection. Anal Bioanal Chem 2010; 398:2003-18. [DOI: 10.1007/s00216-010-4133-6] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Revised: 08/12/2010] [Accepted: 08/15/2010] [Indexed: 01/28/2023]
|
33
|
Vasconcelos TF, Morais AF, Cisne RL, Parteli EJ, Andrade JS. Particle separation in a ramified structure. Chem Eng Sci 2010. [DOI: 10.1016/j.ces.2009.10.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
34
|
Metal associations to microparticles, nanocolloids and macromolecules in compost leachates: Size characterization by asymmetrical flow field-flow fractionation coupled to ICP-MS. Anal Chim Acta 2010; 661:206-14. [DOI: 10.1016/j.aca.2009.12.021] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Revised: 10/27/2009] [Accepted: 12/15/2009] [Indexed: 11/18/2022]
|
35
|
Temporal variability of colloidal material in agricultural storm runoff from managed grassland using flow field-flow fractionation. J Chromatogr A 2009; 1216:9120-4. [DOI: 10.1016/j.chroma.2009.05.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2009] [Revised: 04/22/2009] [Accepted: 05/06/2009] [Indexed: 11/18/2022]
|
36
|
Claveranne-Lamolère C, Lespes G, Dubascoux S, Aupiais J, Pointurier F, Potin-Gautier M. Colloidal transport of uranium in soil: Size fractionation and characterization by field-flow fractionation-multi-detection. J Chromatogr A 2009; 1216:9113-9. [PMID: 19766227 DOI: 10.1016/j.chroma.2009.08.025] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2009] [Revised: 07/17/2009] [Accepted: 08/10/2009] [Indexed: 11/20/2022]
Abstract
The aim of this study was to characterize colloids associated with uranium by using an on-line fractionation/multi-detection technique based on asymmetrical flow field-flow fractionation (As-Fl-FFF) hyphenated with UV detector, multi angle laser light scattering (MALLS) and inductively coupling plasma-mass spectrometry (ICP-MS). Moreover, thanks to the As-Fl-FFF, the different colloidal fractions were collected and characterized by a total organic carbon analyzer (TOC). Thus it is possible to determine the nature (organic or inorganic colloids), molar mass, size (gyration and hydrodynamic radii) and quantitative uranium distribution over the whole colloidal phase. In the case of the site studied, two populations are highlighted. The first population corresponds to humic-like substances with a molar mass of (1500+/-300)gmol(-1) and a hydrodynamic diameter of (2.0+/-0.2)nm. The second one has been identified as a mix of carbonated nanoparticles or clays with organic particles (aggregates and/or coating of the inorganic particles) with a size range hydrodynamic diameter between 30 and 450nm. Each population is implied in the colloidal transport of uranium: maximum 1% of the uranium content in soil leachate is transported by the colloids in the site studied, according to the depth in the soil. Indeed, humic substances are the main responsible of this transport in sub-surface conditions whereas nanoparticles drive the phenomenon in depth conditions.
Collapse
Affiliation(s)
- Céline Claveranne-Lamolère
- Université de Pau et des Pays de l'Adour-CNRS, LCABIE, UMR 5254, IPREM, 2 avenue P. Angot, 64000 Pau, France
| | | | | | | | | | | |
Collapse
|
37
|
van de Ven W, Pünt I, Kemperman A, Wessling M. Unraveling ultrafiltration of polysaccharides with flow field flow fractionation. J Memb Sci 2009. [DOI: 10.1016/j.memsci.2009.04.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
38
|
An overview on field-flow fractionation techniques and their applications in the separation and characterization of polymers. Prog Polym Sci 2009. [DOI: 10.1016/j.progpolymsci.2008.11.001] [Citation(s) in RCA: 230] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
39
|
Katasonova ON, Fedotov PS. Methods for continuous flow fractionation of microparticles: Outlooks and fields of application. JOURNAL OF ANALYTICAL CHEMISTRY 2009. [DOI: 10.1134/s1061934809030022] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
40
|
Optimisation of asymmetrical flow field flow fractionation for environmental nanoparticles separation. J Chromatogr A 2008; 1206:160-5. [DOI: 10.1016/j.chroma.2008.07.032] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Accepted: 07/14/2008] [Indexed: 11/21/2022]
|
41
|
Contado C, Pagnoni A. TiO2 in Commercial Sunscreen Lotion: Flow Field-Flow Fractionation and ICP-AES Together for Size Analysis. Anal Chem 2008; 80:7594-608. [DOI: 10.1021/ac8012626] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Catia Contado
- Department of Chemistry, University of Ferrara, Via Luigi Borsari 46, I-44100 Ferrara, Italy
| | - Antonella Pagnoni
- Department of Chemistry, University of Ferrara, Via Luigi Borsari 46, I-44100 Ferrara, Italy
| |
Collapse
|
42
|
Gimbert LJ, Haygarth PM, Worsfold PJ. Application of flow field-flow fractionation and laser sizing to characterize soil colloids in drained and undrained lysimeters. JOURNAL OF ENVIRONMENTAL QUALITY 2008; 37:1656-1660. [PMID: 18574200 DOI: 10.2134/jeq2007.0583] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
This paper reports the use of a new technique, flow field-flow fractionation (FlFFF), for the characterization of soil sampled under grassland. FlFFF can be used to determine the fine colloidal material in the <1 microm fraction obtained by gravitational settling of 1% m/v soil suspensions. The aim of this work was to determine the potential of FIFFF to characterize soil colloids in drained and undrained field lysimeters from soil cores sampled at different depths. Two different grassland lysimeter plots of 1 ha, one drained and one undrained, were investigated, and the soil was sampled at 20-m intervals along a single diagonal transect at three different depths (0-2, 10-12, and 30-32 cm). The results showed that there was a statistically significant (P = 0.05) increase in colloidal material at 30- to 32-cm depth along the transect under the drained lysimeter, which correlates with disturbance of the soil at this depth due to the installation of tile drains at 85-cm depth backfilled to 30-cm depth with gravel. Laser sizing was also used to determine the particles in the size range 1 to 2000 microm and complement the data obtained using FlFFF because laser sizing lacks resolution for the finer colloidal material (0.1-1.0 microm). The laser sizing data showed increased heterogeneity at 30- to 32-cm depth, particularly in the 50 to 250 microm size fraction. Therefore FIFFF characterized the finer material and laser sizing the coarser soil fraction (<2000 microm) at depth in drained and undrained grassland. This is of importance as colloidal material is more mobile than the larger material and consequently an important vector for contaminant transport from agricultural land to catchments.
Collapse
Affiliation(s)
- Laura J Gimbert
- School of Earth, Ocean and Environmental Sciences, Univ. of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, UK.
| | | | | |
Collapse
|
43
|
Tiede K, Boxall AB, Tear SP, Lewis J, David H, Hassellöv M. Detection and characterization of engineered nanoparticles in food and the environment. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2008; 25:795-821. [DOI: 10.1080/02652030802007553] [Citation(s) in RCA: 350] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Karen Tiede
- a Central Science Laboratory , Sand Hutton, York YO41 1LZ, UK
- e Environment Department , University of York , Heslington, York, Y010 5DD, UK
| | - Alistair B.A. Boxall
- a Central Science Laboratory , Sand Hutton, York YO41 1LZ, UK
- e Environment Department , University of York , Heslington, York, Y010 5DD, UK
| | | | - John Lewis
- a Central Science Laboratory , Sand Hutton, York YO41 1LZ, UK
| | - Helen David
- c Unilever Colworth, Safety and Environmental Assurance Centre , Bedford, UK
| | - Martin Hassellöv
- d Department of Chemistry , University of Gothenburg , Gothenburg, Sweden
| |
Collapse
|
44
|
Dubascoux S, Heroult J, Le Hécho I, Potin-Gautier M, Lespes G. Evaluation of a combined fractionation and speciation approach for study of size-based distribution of organotin species on environmental colloids. Anal Bioanal Chem 2008; 390:1805-13. [DOI: 10.1007/s00216-008-1913-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2007] [Revised: 01/21/2008] [Accepted: 01/23/2008] [Indexed: 11/24/2022]
|
45
|
Alasonati E, Benincasa MA, Slaveykova VI. Asymmetrical flow field-flow fractionation coupled to multiangle laser light scattering detector: optimization of crossflow rate, carrier characteristics, and injected mass in alginate separation. J Sep Sci 2007; 30:2332-40. [PMID: 17683047 DOI: 10.1002/jssc.200700211] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The coupling of the flow field-flow fractionation (FlFFF) to differential refractive index (DRI) and multiangle laser light scattering (LS) detectors is a powerful tool for characterizing charged polysaccharides such as alginate. However, the correct interpretation of the experimental results and extrapolation of meaningful molecular parameters by using an analytical tool with such a level of complexity requires improvement of the knowledge of the alginate behavior in the channel and careful optimization of the operating conditions. Therefore, the influence of the critical operating parameters, such as crossflow rate, carrier composition and concentration, and sample load, on the alginate retention was carefully evaluated. Combined information obtained simultaneously by DRI and LS detectors over the wide range of the crossflow rate, carrier liquid concentration, and injected amount, allowed to set the appropriate combination of optimal parameters. It was found that the crossflow rate of 0.25 mL/min, carrier solution containing 5x10(-2 )mol/L ammonium or sodium chloride, and 50-100 microg of injected sample mass were necessary to achieve complete separation and determination of the meaningful molecular characteristics. The values of the weight-average hydrodynamic radius (R(Hw)), radius of gyration (R(G)), and molar mass (M), obtained under the optimal conditions were in good agreement to those found for alginates in the literature.
Collapse
Affiliation(s)
- Enrica Alasonati
- Environmental Biophysical Chemistry, ISTE-ENAC, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland. Fax: +41-21-693-37-39
| | | | | |
Collapse
|
46
|
Purawatt S, Siripinyanond A, Shiowatana J. Flow field-flow fractionation-inductively coupled optical emission spectrometric investigation of the size-based distribution of iron complexed to phytic and tannic acids in a food suspension: implications for iron availability. Anal Bioanal Chem 2007; 389:733-42. [PMID: 17534611 DOI: 10.1007/s00216-007-1308-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2007] [Revised: 04/11/2007] [Accepted: 04/12/2007] [Indexed: 10/23/2022]
Abstract
Flow field-flow fractionation-inductively coupled plasma optical emission spectrometry (FlFFF-ICP-OES) was applied to achieve the size-based fractionation of iron in a food suspension in order to gain insights into iron availability. The binding of iron with phytic and tannic acids, employed as model inhibitors of iron availability in foods, was investigated at pH 2.0 (representing stomach fluid), pH 5.0 (the transition stage in the upper part of the duodenum), and pH 7.0 (the small intestine). In the presence of phytic acid, iron was found as a free ion or it was associated with molecules smaller than 1 kDa at pH 2.0. Iron associated with molecules larger than 1 kDa when the pH of the mixture was raised to 5.0 and 7.0. In the presence of tannic acid, iron was again mostly associated with molecules smaller than 1 kDa at pH 2.0. However, at pH 5.0, iron and tannic acid associated in large molecules (approximately 25 kDa), while at pH 7.0, most of the iron was associated with macromolecules larger than 500 kDa. Iron size-based distributions of kale extract and tea infusion containing phytic and tannic acids, respectively, were also examined at the three pH values, with and without enzymatic digestion. Without enzymatic digestion of the kale extract and the tea infusion at pH 2.0, most of the iron was released as free ions or associated with molecules smaller than 1 kDa. At other pH values, most of the iron in the kale extract and the tea infusion was found to bind with ~2 kDa and >500 kDa macromolecules, respectively. Upon enzymatic gastrointestinal digestion, the iron was not observed to bind to macromolecules >1 kDa but <500 kDa, due to the enzymatic breakdown of large molecules to smaller ones (<1 kDa).
Collapse
Affiliation(s)
- Sopon Purawatt
- Department of Chemistry, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand
| | | | | |
Collapse
|
47
|
Kowalkowski T, Buszewski B, Cantado C, Dondi F. Field-Flow Fractionation: Theory, Techniques, Applications and the Challenges. Crit Rev Anal Chem 2007. [DOI: 10.1080/10408340600713702] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- T. Kowalkowski
- a Department of Environmental Chemistry and Ecoanalytics, Faculty of Chemistry , Nicolaus Copernicus University , Toruń, Poland
| | - B. Buszewski
- a Department of Environmental Chemistry and Ecoanalytics, Faculty of Chemistry , Nicolaus Copernicus University , Toruń, Poland
| | - C. Cantado
- b Department of Chemistry , University of Ferrara , Ferrara, Italy
| | - F. Dondi
- b Department of Chemistry , University of Ferrara , Ferrara, Italy
| |
Collapse
|
48
|
Prestel H, Niessner R, Panne U. Increasing the Sensitivity of Asymmetrical Flow Field-Flow Fractionation: Slot Outlet Technique. Anal Chem 2006; 78:6664-9. [PMID: 16970350 DOI: 10.1021/ac060259l] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new enrichment approach is described to improve the sensitivity of the asymmetrical flow field-flow fractionation, with and without ICPMS online coupling for elemental detection. For the slot outlet technique, a part of the laminar carrier stream is removed through an additional pump. This allowed an enrichment of the colloidal particles in the separation channel up to a factor of 14. Additional improvements of the separation efficiency permitted us to separate colloids with differences in their molecular masses of only 2 kDa. Different polymer standards, proteins, and synthesized tracer colloids, as well as real samples (wastewater, liquid manure, serums) were used to assess the performance of the new technique.
Collapse
Affiliation(s)
- Harald Prestel
- Institute of Hydrochemistry, Technical University of Munich, Marchioninistrasse 17, D-81377 Munich, Germany.
| | | | | |
Collapse
|
49
|
Shon HK, Kim SH, Erdei L, Vigneswaran S. Analytical methods of size distribution for organic matter in water and wastewater. KOREAN J CHEM ENG 2006. [DOI: 10.1007/bf02706798] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
50
|
Baalousha M, Kammer FVD, Motelica-Heino M, Hilal HS, Le Coustumer P. Size fractionation and characterization of natural colloids by flow-field flow fractionation coupled to multi-angle laser light scattering. J Chromatogr A 2006; 1104:272-81. [PMID: 16360663 DOI: 10.1016/j.chroma.2005.11.095] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2004] [Revised: 11/23/2005] [Accepted: 11/28/2005] [Indexed: 10/25/2022]
Abstract
Flow-field flow fractionation (FlFFF) coupled to multi-angle laser light scattering (MALLS) was evaluated for size and shape determination of standard spherical and arbitrarily shaped natural colloids. Different fitting methods for light scattering data retrieved from MALLS were evaluated to determine the particle size of spherical standards and natural colloids. In addition, FlFFF was optimized for best fractionation in connection to MALLS, minimal colloids-membrane interaction, and minimal sample losses. FlFFF, calibrated with standard particles, was used to determine hydrodynamic diameter, or radius (D(h) or R(h)), of the fractionated colloids, whereas the MALLS was used to determine root mean square radius of gyration (R(g)) for fractionated colloids. Combining both results, by calculating the R(g)/R(h) ratio, allows an estimation of colloid deviation from the shape of homogeneous sphere. Accordingly, this study demonstrates that, FlFFF-MALLS is a valuable technique for characterizing heterogeneous and arbitrarily shaped natural colloidal particles in terms of size and shape. To check the usefulness of FlFFF-MALLS in natural colloid studies, the technique was used to investigate the sedimentation behavior of extracted soil colloidal particles. Results illustrate that, in a silty till sample, carbonates function as cement between the colloidal particles, and consequently, change their sedimentation behavior. On the other hand, carbonate dissolution generates a more homogeneous colloidal sample.
Collapse
Affiliation(s)
- M Baalousha
- University of Bordeaux 1, Center of Development of Applied Geology, Avenue des Facultés, 33400 Talence, France.
| | | | | | | | | |
Collapse
|