DICP OpenIR
On the evaluation of diffusivities in gels using the diffusion cell technique; On the evaluation of diffusivities in gels using the diffusion cell technique
Zhang, W; Furusaki, S
KeywordDiffusion Cell Diffusion Cell Alginate Gel Alginate Gel Diffusion Diffusion Immobilized Cells Immobilized Cells The Quasi-steady-state Method The Quasi-steady-state Method The Time-lag Method The Time-lag Method
Source PublicationBIOCHEMICAL ENGINEERING JOURNAL ; BIOCHEMICAL ENGINEERING JOURNAL
2001-11-01 ; 2001-11-01
Volume9Issue:1Pages:73-82
Indexed BySCI ; SCI
SubtypeArticle ; Article
Department18101 ; 18101
Funding Project1812 ; 1812
WOS HeadingsScience & Technology ; Science & Technology ; Life Sciences & Biomedicine ; Life Sciences & Biomedicine ; Technology ; Technology
WOS SubjectBiotechnology & Applied Microbiology ; Biotechnology & Applied Microbiology ; Engineering, Chemical ; Engineering, Chemical
WOS Research AreaBiotechnology & Applied Microbiology ; Biotechnology & Applied Microbiology ; Engineering ; Engineering
WOS KeywordCALCIUM ALGINATE MEMBRANES ; CALCIUM ALGINATE MEMBRANES ; LACTIC-ACID FERMENTATION ; LACTIC-ACID FERMENTATION ; IMMOBILIZED CELLS ; IMMOBILIZED CELLS ; MASS-TRANSFER ; MASS-TRANSFER ; MALIC-ACID ; MALIC-ACID ; COEFFICIENTS ; COEFFICIENTS ; GLUCOSE ; GLUCOSE ; MODEL ; MODEL ; LAYERS ; LAYERS ; BEADS ; BEADS
AbstractModeling of the gel-immobilized cell system requires accurate measurement of diffusion coefficients. Three methods of the quasi-steady-state (QSS) method, the time-lag (TL) method and a variant quasi-steady-state (VQSS) method were critically assessed and compared for the evaluation of diffusivities using the diffusion cell technique. Experimental data from our laboratory were used for the analysis of the influence of crucial theoretical assumptions not being fulfilled in each method. The results highlighted a risk in obtaining highly variable diffusion coefficients by not validating the QSS and the accuracy of the measurements. In the TL method, the estimation of diffusivities based on the plot intercept that was mostly used in the literature, results in a many fold lower value when compared to that based on the plot slope. The comparison with the QSS and VQSS methods confirmed similar diffusivity obtained by the TL method based on the plot slope. It thus suggested that the correct estimation of diffusivities by the TL method could be based on the plot slope only. Furthermore, the errors associated with the solute mass in the gel, the sample withdrawal and the non-negligible concentration changes in the chambers were also discussed. It is concluded that diffusion cell technique has to be employed cautiously for a correct evaluation of diffusivities. (C) 2001 Elsevier Science B.V. All rights reserved.; Modeling of the gel-immobilized cell system requires accurate measurement of diffusion coefficients. Three methods of the quasi-steady-state (QSS) method, the time-lag (TL) method and a variant quasi-steady-state (VQSS) method were critically assessed and compared for the evaluation of diffusivities using the diffusion cell technique. Experimental data from our laboratory were used for the analysis of the influence of crucial theoretical assumptions not being fulfilled in each method. The results highlighted a risk in obtaining highly variable diffusion coefficients by not validating the QSS and the accuracy of the measurements. In the TL method, the estimation of diffusivities based on the plot intercept that was mostly used in the literature, results in a many fold lower value when compared to that based on the plot slope. The comparison with the QSS and VQSS methods confirmed similar diffusivity obtained by the TL method based on the plot slope. It thus suggested that the correct estimation of diffusivities by the TL method could be based on the plot slope only. Furthermore, the errors associated with the solute mass in the gel, the sample withdrawal and the non-negligible concentration changes in the chambers were also discussed. It is concluded that diffusion cell technique has to be employed cautiously for a correct evaluation of diffusivities. (C) 2001 Elsevier Science B.V. All rights reserved.
Language英语 ; 英语
URL查看原文 ; 查看原文
WOS IDWOS:000172057700010 ; WOS:000172057700010
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/84669
Collection中国科学院大连化学物理研究所
Affiliation1.Flinders Univ S Australia, Sch Med, Bedford Pk, SA 5042, Australia
2.Chinese Acad Sci, Dalian Inst Chem Phys, Marine Bioprod Engn Grp, Dept Biochem Engn, Dalian 116023, Peoples R China
3.Kyushu Univ, Dept Chem Syst & Engn, Fukuoka 8128581, Japan
Recommended Citation
GB/T 7714
Zhang, W,Furusaki, S. On the evaluation of diffusivities in gels using the diffusion cell technique, On the evaluation of diffusivities in gels using the diffusion cell technique[J]. BIOCHEMICAL ENGINEERING JOURNAL, BIOCHEMICAL ENGINEERING JOURNAL,2001, 2001,9, 9(1):73-82, 73-82.
APA Zhang, W,&Furusaki, S.(2001).On the evaluation of diffusivities in gels using the diffusion cell technique.BIOCHEMICAL ENGINEERING JOURNAL,9(1),73-82.
MLA Zhang, W,et al."On the evaluation of diffusivities in gels using the diffusion cell technique".BIOCHEMICAL ENGINEERING JOURNAL 9.1(2001):73-82.
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