A familiar medical plastic can be redesigned with parts borrowed from the human body—and that small change makes it become friendlier to water and break down faster. The surprising part is how useful that controlled breakdown could be. Biodegradable polymers are being developed for many medical uses and more environmentally friendly biomaterials.

Some versions have supported cell growth and helped blood vessels form. Other reported designs combined antibacterial properties with accelerated wound healing and good cell compatibility, while conductive scaffolds supported neural or cardiac tissue regeneration.

But commonly used biodegradable plastics also have drawbacks: some are expensive, break down relatively quickly, and soften at low temperatures. That limits how widely they can be used. The goal was to design and synthesize related PLGA versions by linking the polymer to amino acids as biosimilar materials.

PLGA was synthesized first from lactide and glycolide by ring-opening polymerization, and the amino acids were attached in a second step using an EDC coupling reaction. The resulting materials were checked to identify their chemical structure, size, and behavior when heated.

The amino acids were joined to PLGA by forming a strong chemical link. The two chosen amino acids were L-ornithine and L-glutamine, which were tested separately with PLGA. The researchers used PLGA as the base polymer and added amino acids through amide bonds, creating separate derivative structures with L-ornithine and L-glutamine.

The linked materials became harder to soften with heat than PLGA alone. Their heat-softening temperatures were higher, and the difference was connected with their size, structure, and ability to form more hydrogen bonds.

The higher glass-transition temperatures may reflect changes from amino-acid derivatization, with hydrogen bonding, molecular weight, and end groups contributing. The amino-acid-linked materials interacted with water more readily than PLGA.

Their water contact results supported increased water-friendliness, and both linked materials showed similar behavior. The results also reached a range associated with good cell attachment, while water-friendliness is linked with erosion beginning at the material’s surface.

The headline result came during breakdown in water: after one hundred days, PLGA had lost twenty-five percent of its weight, while the L-ornithine-linked material had lost thirty-eight percent and the L-glutamine-linked material thirty-four percent. So both amino-acid-linked materials broke down faster than PLGA.

The likely reason is that the added water-friendly groups increased the material’s chemical interaction with water. After one hundred days, the plain material had lost about a quarter of its weight, while adding either amino acid raised that loss to roughly one-third.

This matters because the added groups make the material break down faster in water. The twenty-five-day hydrolytic images showed fractures in the linked materials, indicating that breakdown had begun at their surfaces under those conditions.

The nearly straight pattern of mass loss during degradation provides additional evidence that this surface-by-surface process is surface erosion occurring. That matters for controlled drug release: a material can lose material from the outside while largely keeping its shape.

Still, body conditions or enzymes could change this surface breakdown into breakdown throughout the material. Taken together, the surface breakdown makes these materials suitable candidates for biomaterials such as controlled drug-release systems, while also warning that their behavior may change inside the body.

Linking PLGA with amino acids made it more water-friendly and faster to break down, while keeping useful heat resistance. That points toward materials that could release medicine from their surface in a more controlled way.