Sustainable thermal paper formulation using lignocellulosic biomass fractions

Area of Science:

• Materials Science
• Green Chemistry
• Biotechnology

Background:

• Conventional thermal paper utilizes bisphenol A (BPA) and bisphenol S (BPS) as color developers, posing recognized health risks.
• Limited research exists on developing safer, sustainable alternatives for thermal paper formulations.

Purpose of the Study:

• To introduce novel, sustainable thermal paper formulations utilizing functionalized lignin polymers and xylan-derived compounds.
• To evaluate the performance and safety profile of these bio-based alternatives compared to traditional developers.

Main Methods:

• Light-colored lignin polymer was produced via sequential aldehyde-assisted fractionation to minimize chromophore concentration.
• Xylan-derived diformylxylose (DFX) was synthesized as a sensitizer.
• Performance was assessed by color density at 120°C, and stability was tested under ambient conditions.
• Estrogenic activity and ecotoxicity (bacteria, algae) of lignin-based developers and DFX were evaluated.

Main Results:

• Polymeric lignin combined with DFX demonstrated good performance with color density between 0.8 to 1.1 at 120°C.
• The developed coatings exhibited stability for over a year under ambient conditions.
• Lignin-based developers showed significantly lower estrogenic activity (2-3 orders of magnitude less than BPA, 1-2 orders less than BPS).
• The DFX sensitizer displayed no detectable estrogenic activity or toxicity to bacteria or algae.

Conclusions:

• Sustainable thermal paper formulations based on lignin and xylan derivatives offer a promising, safer alternative to BPA/BPS-based papers.
• These bio-derived materials present reduced health and environmental risks without compromising performance.
• The study highlights the potential of biomass fractionation for creating eco-friendly functional materials.