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Publications (10 of 27) Show all publications
Rönnols, J., Danieli, E., Freichels, H. & Aldaeus, F. (2019). Lignin analysis with benchtop NMR spectroscopy. Holzforschung
Open this publication in new window or tab >>Lignin analysis with benchtop NMR spectroscopy
2019 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

Benchtop nuclear magnetic resonance (NMR) spectroscopy is an emerging field with an appealing profile for industrial applications. The instrumentation offers the possibility to measure NMR spectra in situations where high-field NMR spectroscopy is considered too expensive or complicated. In this study, we investigated the scope and limitations of 1H NMR measurements on kraft lignins and black liquors at low magnetic field strengths (1.0 and 1.5 T). The ability to quantify different classes of compounds was investigated and found to be promising. NMR-based diffusion measurements were performed, with the aim of gaining insight into the molar mass of the lignins at hand. These measurements were fast, repeatable and in good agreement with established methods.

Place, publisher, year, edition, pages
De Gruyter, 2019
Keywords
benchtop NMR, black liquor, diffusion, lignin, NMR, Nuclear magnetic resonance, Different class, Diffusion measurements, Gaining insights, Lignin analysis, Low magnetic fields, NMR measurements, Nuclear magnetic resonance(NMR), Nuclear magnetic resonance spectroscopy
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39676 (URN)10.1515/hf-2018-0282 (DOI)2-s2.0-85068798730 (Scopus ID)
Available from: 2019-08-07 Created: 2019-08-07 Last updated: 2019-08-07Bibliographically approved
Rönnols, J., Jacobs, A., Aldaeus, F. & Larsson, T. (2018). Digging in the structure and functionality of lignocellulosic raw material: from academic knowledge towards industrial applications. In: Hytönen Eemeli, Vepsäläinen Jessica (Ed.), The 8th Nordic Wood Biorefinery Conference: NWBC 2018 : proceedings. Paper presented at The 8th Nordic Wood Biorefinery Conference held in Helsinki, Finland, 22-25 Oct. 2018 (pp. 205-205). Espoo: VTT
Open this publication in new window or tab >>Digging in the structure and functionality of lignocellulosic raw material: from academic knowledge towards industrial applications
2018 (English)In: The 8th Nordic Wood Biorefinery Conference: NWBC 2018 : proceedings / [ed] Hytönen Eemeli, Vepsäläinen Jessica, Espoo: VTT , 2018, p. 205-205Conference paper, Oral presentation with published abstract (Other academic)
Place, publisher, year, edition, pages
Espoo: VTT, 2018
Keywords
lignocellulose, supramolecular structure, NMR spectroscopy
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-35551 (URN)978-951-38-8672-1 (ISBN)
Conference
The 8th Nordic Wood Biorefinery Conference held in Helsinki, Finland, 22-25 Oct. 2018
Available from: 2018-10-30 Created: 2018-10-30 Last updated: 2019-04-03Bibliographically approved
Regnell Andersson, S., Rönnols, J., Aldaeus, F. & Jacobs, A. (2018). Lignin Bimodality: Fact or Artefact?. In: 15th European workshop on lignocellulosics and pulp: Proceedings for oral presentations. Paper presented at 15th European workshop on lignocellulosics and pulp, Aveiro, Portugal, June 26-29, 2018 (pp. 97-100).
Open this publication in new window or tab >>Lignin Bimodality: Fact or Artefact?
2018 (English)In: 15th European workshop on lignocellulosics and pulp: Proceedings for oral presentations, 2018, p. 97-100Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Size Exclusion Chromatography (SEC) of lignin poses many challenges. In numerous studies chromatograms of lignin show a bimodal molar mass distribution. Is this a true characteristic of lignin, is it caused by molecular associations or aggregations, or could it could be an artefact from using column combinations with porosities that do not match properly? To improve resolution and enable separation over a larger molar mass range, multiple columns with different porosities are often connected in series. If the porosities do not match properly, the result appears as a shoulder or bimodality in the chromatogram. To understand whether the bimodal distribution is a sample characteristic or an analyze artefact, we have used different columns, column combination and samples to see when the results is a bimodal distribution and when only one peak is formed. Results show that the bimodality of lignin can be an artifact originating from column mismatch. Using single porosity columns with a low molar mass cut-off should be avoided since it can cause false bimodality.

Keywords
size exclusion chromatography, SEC, GPC, lignin
National Category
Analytical Chemistry
Identifiers
urn:nbn:se:ri:diva-35318 (URN)
Conference
15th European workshop on lignocellulosics and pulp, Aveiro, Portugal, June 26-29, 2018
Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2019-06-20Bibliographically approved
Rönnols, J., Jacobs, A. & Aldaeus, F. (2018). Recent advances in NMR spectroscopy of lignin and black liquor. In: 15th European workshop on lignocellulosics and pulp: proceedings for oral presentations. Paper presented at 15th European workshop on lignocellulosics and pulp, Aveiro, Portugal, June 26-29, 2018 (pp. 57-60).
Open this publication in new window or tab >>Recent advances in NMR spectroscopy of lignin and black liquor
2018 (English)In: 15th European workshop on lignocellulosics and pulp: proceedings for oral presentations, 2018, p. 57-60Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

This paper describes improvements in the methodology for NMR spectroscopic analysis of dissolved kraft lignins and black liquors, for structural analysis as well as for reaction monitoring. The described methodologies are variations and applications of non-uniform sampling (NUS) in 2D spectra and diffusion ordered spectroscopy (DOSY), with reduced experiment time and/or increased resolution and novel ways to track reactions through monitoring of diffusion of a reactant mixture.

Keywords
nuclear magnetic resonance, NMR, spectroscopy, lignin, black liquor, NUS, diffusion, reaction monitoring
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-35317 (URN)
Conference
15th European workshop on lignocellulosics and pulp, Aveiro, Portugal, June 26-29, 2018
Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2019-04-03Bibliographically approved
Aldaeus, F. (2018). The Bioeconomy Research Programme 2018-2020. In: Hytönen Eemeli, Vepsäläinen Jessica (Ed.), The 8th Nordic Wood Biorefinery Conference: NWBC 2018: proceedings. Paper presented at The 8th Nordic Wood Biorefinery Conference held in Helsinki, Finland, 22-25 Oct. 2018 (pp. 83). Espoo: VTT Technical Research Centre of Finland
Open this publication in new window or tab >>The Bioeconomy Research Programme 2018-2020
2018 (English)In: The 8th Nordic Wood Biorefinery Conference: NWBC 2018: proceedings / [ed] Hytönen Eemeli, Vepsäläinen Jessica, Espoo: VTT Technical Research Centre of Finland , 2018, p. 83-Conference paper, Oral presentation with published abstract (Other academic)
Place, publisher, year, edition, pages
Espoo: VTT Technical Research Centre of Finland, 2018
Series
VTT Technology, ISSN 2242-1211 ; 340
Keywords
research programme, bioeconomy, wood biorefining
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-36379 (URN)978-951-38-8672-1 (ISBN)
Conference
The 8th Nordic Wood Biorefinery Conference held in Helsinki, Finland, 22-25 Oct. 2018
Available from: 2018-11-20 Created: 2018-11-20 Last updated: 2018-11-20Bibliographically approved
Rönnols, J., Aldaeus, F., Jacobs, A., Freichels, H. & Danieli, E. (2017). Benchtop NMR measurements on kraft lignin. In: 19th International symposium on wood, fibre and pulping chemistry, August 28 - September 1, 2017, Porto Seguro, Brazil: . Paper presented at 19th International symposium on wood, fibre and pulping chemistry, August 28 - September 1, 2017, Porto Seguro, Brazil (pp. 434-438).
Open this publication in new window or tab >>Benchtop NMR measurements on kraft lignin
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2017 (English)In: 19th International symposium on wood, fibre and pulping chemistry, August 28 - September 1, 2017, Porto Seguro, Brazil, 2017, p. 434-438Conference paper, Published paper (Refereed)
Abstract [en]

The use of NMR spectroscopy at high magnetic fields is a common tool in the analysis of lignin samples. In the presented study, NMR measurements on a group of softwood and hardwood kraft lignins at low field (1.0 T) with a benchtop NMR spectrometer, containing a permanent magnet, are investigated and evaluated. NMR based diffusion measurements were performed, for which the results were found to be fast, repeatable, and in good agreement numbers to measurements at high field. Measurements were also performed on a sample in alkaline solution, as a model for black liquor analysis, with promising initial results.

Keywords
nuclear magnetic resonance, lignin, diffusion, spectroscopy
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-33014 (URN)
Conference
19th International symposium on wood, fibre and pulping chemistry, August 28 - September 1, 2017, Porto Seguro, Brazil
Available from: 2018-01-10 Created: 2018-01-10 Last updated: 2019-04-03Bibliographically approved
Rönnols, J., Jacobs, A. & Aldaeus, F. (2017). Consecutive determination of softwood kraft lignin structure and molar mass from NMR measurements. Holzforschung, 71(7-8), 563-570
Open this publication in new window or tab >>Consecutive determination of softwood kraft lignin structure and molar mass from NMR measurements
2017 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 71, no 7-8, p. 563-570Article in journal (Refereed) Published
Abstract [en]

The general molecular properties and in particular, the molar mass of lignin are of central importance for industrial applications, as these data govern important thermal and mechanical characteristics. The focus of the present paper is pulsed field gradient-nuclear magnetic resonance (PFG-NMR), which is suitable for determination of lignins’ weight-Average molar mass, based on diffusion constants. The method is calibrated by lignin fractions characterized by matrix-Assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS). It could be demonstrated on a set of softwood kraft lignins that the PFG-NMR approach gives results in very good agreement with those obtained using conventional size exclusion chromatography (SEC).

Keywords
diffusion, spectroscopy, lignin, molar mass, nuclear magnetic resonance, softwood kraft lignin, size exclusion chromatography
National Category
Chemical Sciences Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-30165 (URN)10.1515/hf-2016-0182 (DOI)2-s2.0-85023191402 (Scopus ID)
Available from: 2017-08-01 Created: 2017-08-01 Last updated: 2019-07-05Bibliographically approved
Aldaeus, F., Olsson, A.-M. & Stevanic Srndovic, J. (2017). Miniaturized determination of ash content in kraft lignin samples using oxidative thermogravimetric analysis. Nordic Pulp & Paper Research Journal, 32(2), 280-282
Open this publication in new window or tab >>Miniaturized determination of ash content in kraft lignin samples using oxidative thermogravimetric analysis
2017 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, no 2, p. 280-282Article in journal (Refereed) Published
Abstract [en]

A study has been made of several aspects of determination of ash content in kraft lignin samples using thermogravimetric analysis (TGA). Three different methods were used; with the main differences between the methods being that two have a temperature hold at 250 deg C to remove volatiles and that the three methods use different maximum temperatures, namely 525, 550 and 575 deg C, respectively. The three kraft lignins used were produced using the LignoBoost lignin isolation process. It has been demonstrated that the results obtained by the different temperature programmes showed no significant difference. The results were comparable with those from using oven ignition. Moreover, the limit of quantification was several orders of magnitude lower than when using oven ignition. It has been recommended that if TGA is used for determination of ash content, a temperature programme from a standard method should be used, which should be mentioned together with the results. The temperature programme in method one (corresponding to ISO 1762) was the shortest and the preferable method. A well as requiring less labour due to fewer movements in the analytical protocol, the TGA methods enabled a high sample throughput due to autosampling possibilities.

Keywords
analytical method, ash content, biorefinery, kraft lignin, thermogravimetry
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-32955 (URN)10.3183/NPPRJ-2017-32-02-p280-282 (DOI)2-s2.0-85053880988 (Scopus ID)
Available from: 2018-01-02 Created: 2018-01-02 Last updated: 2019-01-10Bibliographically approved
Jacobs, A., Aldaeus, F., Gagne, A., Kouisni, L., Liitia, T., Mikkelson, A., . . . Tamminen, T. (2017). Mitigating trade barriers by standardized determination of lignin molar mass. In: The 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017: NWBC 2017. Paper presented at 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017 (pp. 98-103). Stockholm: RISE Bioekonomi
Open this publication in new window or tab >>Mitigating trade barriers by standardized determination of lignin molar mass
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2017 (English)In: The 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017: NWBC 2017, Stockholm: RISE Bioekonomi , 2017, p. 98-103Conference paper, Published paper (Refereed)
Abstract [en]

RISE Bioeconomy, FPInnovations and VTT Technical Research Centre of Finland Ltd are working on a draft for an official ISO method for the determination of lignin molar mass. The draft will include two methods that can be used by different laboratories as reference methods, which are based on organic and aqueous size exclusion chromatography (SEC). Four samples of kraft lignin of different origin were analysed by three laboratories using the current in-house methods as well as a harmonised analytical setup. It was clear that the results differed largely between the different methods, for example, the weight average molar mass (Mw) for the LignoForce softwood lignin (LF-SW) ranged from 3,300 t0 11,100g/mol using the different methods. Harmonisation of aqueous SEC was successful. The method comprises SEC using 0l.1M sodium hydroxide as the mobile phase, a mobile phase flow rate of 0.5mL/min, Waters columns MCX 1,000A and 100,000A in series and calibration/calculation using polystyrene sulphonate standards using a linear fit. However, organic SEC was more complex and would require further investigations. Although the aqueous SEC analysis was repeatable, it was concluded that a strategy for data evaluation should be developed in order to achieve a method applicable for quality assessments.

Place, publisher, year, edition, pages
Stockholm: RISE Bioekonomi, 2017
Keywords
analytical method, lignin, molar mass, size exclusion chromatography, standardisation
National Category
Chemical Engineering
Identifiers
urn:nbn:se:ri:diva-29751 (URN)9789186018207 (ISBN)
Conference
7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017
Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2019-06-20Bibliographically approved
Aldaeus, F., Dedic, D., Karpenja, T., Magnusson, M., Rosén, F., Sundin, K., . . . Modorato-Rosta, C. (2017). Towards a cellulose-based society: current market and consumer trends. In: The 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017: NWBC 2017. Paper presented at 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017 (pp. 1). Stockholm: RISE Bioekonomi
Open this publication in new window or tab >>Towards a cellulose-based society: current market and consumer trends
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2017 (English)In: The 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017: NWBC 2017, Stockholm: RISE Bioekonomi , 2017, p. 1-Conference paper, Published paper (Other academic)
Abstract [en]

It has been proposed that the future of the forest industry will involve the traditional value chains combined with the needs and demands of a bio-based economy. A global consumer survey was undertaken, together with interviews and workshops with various representatives through the bio-economy. Sources also included in-depth literature studies and research reviews. Based on this input, several current trends have been identified that will affect the route towards a cellulose-based society. These trends describe the effects of urbanization, consumer behaviour, new business models, material recycling, open innovation and the necessity for early demonstration of new research. Four different but equally plausible scenarios have been identified describing the society and the role of cellulose in 2030, highlighting the role of the wood-based biorefinery.

Place, publisher, year, edition, pages
Stockholm: RISE Bioekonomi, 2017
Keywords
biorefinery, cellulose, consumer, market research, market trends, survey, wood
National Category
Social Sciences Interdisciplinary
Identifiers
urn:nbn:se:ri:diva-29748 (URN)9789186018207 (ISBN)
Conference
7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017
Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2018-08-23Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0779-5267

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