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Chemical Characterization of Alkali Lignins Isolated from Rapeseed Stalks.

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Title: Chemical Characterization of Alkali Lignins Isolated from Rapeseed Stalks.
Authors: Tofanica, Bogdan-Marian1 (AUTHOR), Ungureanu, Elena1,2 (AUTHOR) costel.samuil@iuls.ro, Callone, Emanuela2,3 (AUTHOR), Puitel, Adrian-Catalin3,4 (AUTHOR), Samuil, Costel1,5 (AUTHOR), Ungureanu, Ovidiu C.1,4 (AUTHOR), Fortuna, Maria E.2,5 (AUTHOR), Popa, Valentin I.3 (AUTHOR)
Source: Polymers (20734360). Feb2026, Vol. 18 Issue 4, p494. 22p.
Subjects: Lignins, Delignification, Analytical chemistry, Rapeseed, Paper industry, Crop residues
Abstract: Rapeseed stalks (Brassica napus), an abundant agricultural residue, represent a promising non-woody raw material for the pulp and paper industry. This study focuses on the chemical and structural characterization of alkali lignins isolated from black liquors generated by two common delignification methods: Kraft and Soda-Anthraquinone Pulping of rapeseed stalks. The objective is to understand how the chemical environment of each process influences the final structure, fragmentation degree, and reactivity of the isolated lignin. In practice, lignin samples are recovered from black liquors produced under varying conditions (alkali charge, time, and temperature) to achieve defined levels of delignification. Detailed characterization was performed using advanced analytical techniques, including Gel Permeation Chromatography, Solid-State Cross-Polarization/Magic-Angle-Spinning Nuclear Magnetic Resonance, and FT-IR and UV-Vis Spectroscopy. The findings provide essential data on the structural differences, confirming the suitability of the resulting materials for potential high-value applications. Furthermore, the structural similarities and performance indicators suggest that the Soda-AQ process enables successful delignification of rapeseed stalks without the sulfur emission issues associated with the Kraft method, thus validating the former as an environmentally cleaner alternative for non-wood biomass utilization supporting the complete valorization of rapeseed agricultural waste. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Chemical Characterization of Alkali Lignins Isolated from Rapeseed Stalks.
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  Data: <searchLink fieldCode="AR" term="%22Tofanica%2C+Bogdan-Marian%22">Tofanica, Bogdan-Marian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ungureanu%2C+Elena%22">Ungureanu, Elena</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> costel.samuil@iuls.ro</i><br /><searchLink fieldCode="AR" term="%22Callone%2C+Emanuela%22">Callone, Emanuela</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Puitel%2C+Adrian-Catalin%22">Puitel, Adrian-Catalin</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Samuil%2C+Costel%22">Samuil, Costel</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ungureanu%2C+Ovidiu+C%2E%22">Ungureanu, Ovidiu C.</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fortuna%2C+Maria+E%2E%22">Fortuna, Maria E.</searchLink><relatesTo>2,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Popa%2C+Valentin+I%2E%22">Popa, Valentin I.</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Feb2026, Vol. 18 Issue 4, p494. 22p.
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  Data: <searchLink fieldCode="DE" term="%22Lignins%22">Lignins</searchLink><br /><searchLink fieldCode="DE" term="%22Delignification%22">Delignification</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+chemistry%22">Analytical chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Rapeseed%22">Rapeseed</searchLink><br /><searchLink fieldCode="DE" term="%22Paper+industry%22">Paper industry</searchLink><br /><searchLink fieldCode="DE" term="%22Crop+residues%22">Crop residues</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Rapeseed stalks (Brassica napus), an abundant agricultural residue, represent a promising non-woody raw material for the pulp and paper industry. This study focuses on the chemical and structural characterization of alkali lignins isolated from black liquors generated by two common delignification methods: Kraft and Soda-Anthraquinone Pulping of rapeseed stalks. The objective is to understand how the chemical environment of each process influences the final structure, fragmentation degree, and reactivity of the isolated lignin. In practice, lignin samples are recovered from black liquors produced under varying conditions (alkali charge, time, and temperature) to achieve defined levels of delignification. Detailed characterization was performed using advanced analytical techniques, including Gel Permeation Chromatography, Solid-State Cross-Polarization/Magic-Angle-Spinning Nuclear Magnetic Resonance, and FT-IR and UV-Vis Spectroscopy. The findings provide essential data on the structural differences, confirming the suitability of the resulting materials for potential high-value applications. Furthermore, the structural similarities and performance indicators suggest that the Soda-AQ process enables successful delignification of rapeseed stalks without the sulfur emission issues associated with the Kraft method, thus validating the former as an environmentally cleaner alternative for non-wood biomass utilization supporting the complete valorization of rapeseed agricultural waste. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/polym18040494
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        Text: English
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        PageCount: 22
        StartPage: 494
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      – SubjectFull: Lignins
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      – SubjectFull: Analytical chemistry
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      – SubjectFull: Rapeseed
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      – SubjectFull: Paper industry
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      – SubjectFull: Crop residues
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      – TitleFull: Chemical Characterization of Alkali Lignins Isolated from Rapeseed Stalks.
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              M: 02
              Text: Feb2026
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