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  • Title: Tapping the Full Potential of Infrared Spectroscopy for the Analysis of Technical Lignins.
    Author: Sumerskii I, Böhmdorfer S, Tsetsgee O, Sulaeva I, Khaliliyan H, Musl O, Dorninger K, Tischer A, Potthast K, Rosenau T, Brereton RG, Potthast A.
    Journal: ChemSusChem; 2024 May 21; 17(10):e202301840. PubMed ID: 38240610.
    Abstract:
    We present an approach to overcome the challenges associated with the increasing demand of high-throughput characterization of technical lignins, a key resource in emerging bioeconomies. Our approach offers a resort from the lack of direct, simple, and low-cost analytical techniques for lignin characterization by employing multivariate calibration models based on infrared (IR) spectroscopy to predict structural properties of lignins (i. e., functionality, molar mass). By leveraging a comprehensive database of over 500 well-characterized technical lignin samples - a factor of 10 larger than previously used sets - our chemometric models achieved high levels of quality and statistical confidence for the determination of different functional group contents (RMSEPs of 4-16 %). However, the statistical moments of the molar mass distribution are still best determined by size-exclusion chromatography. Analyses of over 500 technical lignins offered also a great opportunity to provide information on the general variability in kraft lignins and lignosulfonates (from different origins). Overall, the effected savings in analysis time (>7 h), resources, and required sample mass combined with non-destructiveness of the measurement satisfy key demands for efficient high-throughput lignin analyses. Finally, we discuss the advantages, disadvantages, and limitations of our approach, along with critical insights into the associated chemical-analytical and spectroscopic challenges.
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