Chiba University Scientists Develop Adaptive Chlorophyll Polymer Capable of Gradual Helical Transformation Over Time

Researchers develop a chlorophyll-based polymer that transforms from fibers into helices over several days, mimicking the structural adaptability of DNA.

By: AXL Media

Published: Apr 28, 2026, 4:32 AM EDT

Source: Information for this report was sourced from Chiba University

Engineering Synthetic Adaptability Through Biological Inspiration

The architectural elegance of the helical shape, most famously observed in the double helix of DNA, is fundamental to the functionality and adaptability of biological systems. Nature utilizes these twists to allow proteins and genetic material to respond to environmental shifts by altering their tension or direction. According to Professor Shiki Yagai of Chiba University, creating synthetic materials that replicate this time-evolving behavior has remained a significant challenge in materials science. However, a new chlorophyll-based supramolecular polymer developed by researchers across Japan and the UK has successfully demonstrated the ability to gradually mature from simple fibers into complex helical arrangements.

Molecular Self-Assembly and the Formation of Rosettes

The research team synthesized a chlorophyll derivative modified with barbituric acid groups and long alkyl chains to facilitate specific molecular interactions. In low-polarity solvents, these molecules utilize hydrogen bonding to assemble into ring-like structures known as rosettes. Due to the large and complex nature of the chlorophyll units, the rosettes do not immediately settle into a stable helical configuration. Instead, they initially form nonhelical fibers (NF) where the rosettes are stacked directly on top of one another without any offset. This initial state represents a kinetically trapped structure that serves as the starting point for a multi-day evolutionary process.

The Four-Stage Evolution of Structural Helicity

Using atomic force microscopy, the researchers identified four distinct fiber types that emerge during the polymer’s maturation. Following the initial nonhelical form, the system transitions through three helical forms, designated as HF1, HF2, and HF3. All three helical stages are right-handed but feature progressively tighter twists, with pitch measurements decreasing from 26 nm to 13 nm, and finally to 8 nm. This stepwise progression represents a rare behavior in synthetic chemistry, where a material does not reach its final form instantly but instead navigates a rugged energy landscape through discrete intermediate stages.