In-situ visual delignification and cell-scale kinetics modeling using confocal Raman microscopy

Area of Science:

• Plant Biology
• Biomass Valorization
• Biotechnology

Background:

• Efficient delignification is crucial for unlocking plant cell wall resources.
• Plant cell walls possess complex, heterogeneous structures influencing biomass recalcitrance.
• Understanding cell-scale delignification dynamics is vital for optimizing biomass processing.

Purpose of the Study:

• To visualize and quantify in-situ delignification dynamics at the cell scale in rice stem tissues.
• To investigate cell-type-specific delignification kinetics and responses.
• To establish delignification kinetic models for distinct rice tissues and cells.

Main Methods:

• Confocal Raman microscopy mapping was utilized for in-situ lignin content analysis.
• Delignification process was visualized across various rice stem cell types.
• Quantitative kinetic models were developed for the acidified sodium chlorite delignification process.

Main Results:

• Pronounced cell-type-dependent delignification responses were observed in rice stem tissues.
• Lignin content and delignification rates varied significantly among different cell types (parenchyma, sclerenchyma, xylem, etc.).
• First-time establishment of delignification kinetic models for distinct plant cell types.

Conclusions:

• Biomass recalcitrance is influenced by factors beyond mere lignin content, including cell-type specific architecture.
• Cell-specific delignification kinetics provide a quantitative framework for understanding biomass processing.
• This approach enables optimization of delignification strategies for enhanced plant cell wall valorization.