HPLC Determination of Sulphonated Melamines-Formaldehyde Condensates (SMFC) and Lignosulphonates (LS) in Drinking and Ground Waters

Pojana, Giulio; Carrer, Claudio; Cammarata, Filippo; Marcomini, Antonio; Crescenzi, Carlo

doi:10.1080/030673103000104236

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…The oligomer-by-oligomer separation revealed, according to Pojana et al, that homologs and isomers were present in the lignosulfonate. However, due to the absence of reference standards for the individual oligomers, assignment of the number of oligomeric units was not yet possible [19].…”

Section: Rp Lcmentioning

confidence: 99%

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Analytical methodology for sulfonated lignins

Brudin¹,

Schoenmakers²

2010

J of Separation Science

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There is a significant need to characterize and classify lignins and sulfonated lignins. Lignins have so far received a good deal of attention, whereas this is not true for sulfonated lignins. There is a clear demand for a better understanding of sulfonated lignins on a chemical as well as physical level. Many of the analytical methods have been developed with different goals in mind, for example, detection of sulfonated lignins in pulp-mill effluents, elucidation of structural changes in lignosulfonates during a pulping process, or identification of properties that may affect a formulation when sulfonated lignins are used as a dispersant. When sulfonated lignins are used in industrial applications, analytical data obtained using different techniques may be necessary to enable prediction of their behavior in the target application. In the present review, a critical discussion of established and promising analytical techniques for the characterization of sulfonated lignins is presented.

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Section: Rp Lcmentioning

confidence: 99%

“…Pojana et al . 19 developed a method based on HPLC for the determination of lignosulfonates and sulfonated melamine‐formaldehyde condensates in drinking and ground water. Retention and separation of the lignosulfonates on a RP column was achieved by the use of an ion‐pairing agent.…”

Section: Analysis Of Sulfonated Ligninsmentioning

confidence: 99%

Analytical methodology for sulfonated lignins

Brudin¹,

Schoenmakers²

2010

J of Separation Science

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“…An umber of publications focused on the exploration of ionpair reversed-phase LC (RPLC)o fl ignins,l ignin derivatives, lignin degradation products,a nd humic substances, whicha re another class of biobased polyelectrolytes. [5][6][7][8][9][10][11] However,t he goal was separation according to size, butn ot accordingt o chemicalc omposition. Brudin et al could not achieves ignificant orthogonality of separation using the combination of ionpair RPLC and ion-pair SEC.…”

Section: Introductionmentioning

confidence: 99%

“…A number of publications focused on the exploration of ion‐pair reversed‐phase LC (RPLC) of lignins, lignin derivatives, lignin degradation products, and humic substances, which are another class of biobased polyelectrolytes . However, the goal was separation according to size, but not according to chemical composition.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Interaction Chromatography in 2 D Liquid Chromatography Characterization of Lignosulfonates

et al. 2020

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Lignosulfonates are bulk‐scale byproducts of industrial sulfite pulping. Their amphiphilic character plays a central role in their successful application in large‐scale materials production. As an inherent feature of the chemical structure, this amphiphilic character poses a major analytical challenge. In this study, the amphiphilic behavior of an industrial lignosulfonate was investigated by hydrophobic interaction chromatography (HIC). This technique exploits hydrophobic regions present on the surface of lignosulfonates. Extensive characterization of the obtained fractions from preparative HIC, in terms of elemental composition, functional‐group content, chemical structure, and molecular weight distribution, revealed a detailed picture of the chemical composition distribution. The charge‐to‐size ratio, that is, differences in the degree of sulfonation, was the dominant factor governing separation in HIC. A combination of HIC with size exclusion chromatography showed good orthogonality of separation and demonstrated the power of this 2 D liquid chromatography approach for an in‐depth characterization, in general, and amphiphilicity, in particular.

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