Fig. HSQC Spectrum of Aromatic Region for Freeze Dried lignin reference sample 1-1
Fig. HSQC Spectrum of Apliphatic Region for Freeze Dried lignin reference sample 1-1
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Aromatic Region:
Well-defined signals for H2,6 peaks suggest excellent preservation of aromatic structures. The absence of thermal and pressure-related artifacts indicates that freeze-drying effectively prevents condensation and polymerization reactions, preserving the native lignin structure.
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Aliphatic Region:
Methoxy (OMe) and β-O-4 linkages are distinctly visible, highlighting the structural integrity of aliphatic linkages. This demonstrates the effectiveness of freeze-drying in maintaining both the aromatic and aliphatic structures without inducing thermal degradation.