AI-optimized production of lignin-carbohydrate complexes with superior antioxidant properties using hydrothermal treatment of biomass

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master_Seyedin_Navadeh_Maryam_2025.pdf (7.73 MB)

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School of Engineering | Master's thesis
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Date

2025-10-25

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Major/Subject

Energy Conversion Processes

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Degree programme

Master's Programme in Advanced Energy Solutions
Kehittyneiden energiaratkaisujen maisteriohjelma
Magisterprogrammet i avancerade energilösningar

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en

Pages

51

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Abstract

This study aims to examine the industrial scalability of a novel biorefinery method, AquaSolv Omni (AqSO), to bridge the gap between laboratory results and industrial applications of lignin-carbohydrate complexes (LCCs) with tuned properties. Hydrothermal treatment, followed by acetone extraction, was applied as the green biomass processing step, offering tunable results through varying processing conditions. Several conditions were tested, while the effect of the processing conditions on the resulting structure of LCCs was assessed via 2D NMR HSQC. Subsequently, the modified DPPH Assay was employed to evaluate the antioxidant properties of the produced samples, enabling to provide a process-structure-property correlation. Specifically, harsher conditions yielded lignins with superior antioxidant activity, whereas mild conditions resulted in carbohydrate-rich lignins with high β-O-4 content. The findings presented here provide a solid foundation for advancing application-specific lignin-based innovations, despite the challenges posed by the complexity of biomass and the scale-up of processes.

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Supervisor

Hummel, Michael

Thesis advisor

Diment, Daryna

Keywords

lignin, lignin-carbohydrate complexes (LCCs), biomass, hydrothermal treatment, antioxidant properties, NMR spectroscopy

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https://urn.fi/URN:NBN:fi:aalto-202512159168

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[dipl] Insinööritieteiden korkeakoulu / ENG