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Fast estimation of adsorption isotherm parameters in gradient elution preparative liquid chromatography. I: The single component case
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper.ORCID-id: 0000-0001-8561-6872
Department of Chemical Engineering, Rzeszów University of Technology, Rzeszów, Poland.
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper.ORCID-id: 0000-0002-8943-6286
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper.ORCID-id: 0000-0003-1819-1709
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2013 (Engelska)Ingår i: Journal of Chromatography A, ISSN 0021-9673, E-ISSN 1873-3778, Vol. 1299, s. 64-70Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The inverse method is a numeric method for fast estimation of adsorption isotherm parameters directly from overloaded elution profiles. However, it has previously only been used for isocratic experiments. Here we will extend the inverse method so it can be used for gradient elution too. This extended inverse method will make it possible to study the adsorption of substances whose retention factor vary strongly with the mobile-phase composition, like peptides and proteins, where the classic methods will fail. Our extended inverse method was verified using both simulations and real experiments. For simulated overloaded elution profiles we were able to determine almost exact Langmuir adsorption isotherm parameters with the new approach. From real experimental data, bi-Langmuir adsorption parameters were estimated using both the perturbation peak method and the extended inverse method. The shape of the acquired adsorption isotherms did match over the considered concentration range; however, the adsorption isotherm parameters found with the two methods were not the same. This is probably due to the fact that adsorption isotherm estimated with the inverse method is only a good approximation up to the highest eluted concentration in the used chromatograms. But this is not a serious drawback from a process point of view where the main objective is to make accurate predictions of elution profiles. The bi-Langmuir adsorption isotherm obtained with both methods could accurately predict the shape of overloaded elution profiles.

Ort, förlag, år, upplaga, sidor
2013. Vol. 1299, s. 64-70
Nyckelord [en]
Adsorption isotherm determination, Gradient elution, Inverse method, RPLC
Nationell ämneskategori
Teknik och teknologier Analytisk kemi
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Kemi
Identifikatorer
URN: urn:nbn:se:kau:diva-28799DOI: 10.1016/j.chroma.2013.05.041ISI: 000321424000009PubMedID: 23769206OAI: oai:DiVA.org:kau-28799DiVA, id: diva2:643988
Tillgänglig från: 2013-08-29 Skapad: 2013-08-29 Senast uppdaterad: 2019-07-12Bibliografiskt granskad

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Åsberg, DennisEnmark, MartinSamuelsson, JörgenFornstedt, Torgny

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Journal of Chromatography A
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