Cellophane bees produce a kind of plastic that degrades: study, Pg13

Key Highlights:

• Scientists have discovered that Colletes inaequalis, commonly known as cellophane or polyester bees, produce a rapidly degrading plastic-like material.
• This unique material, a blend of silk and polyester secreted by female bees, lines their underground nests.
• The study, published in the Proceedings of the National Academy of Sciences, found that the polyester content of the nest lining degraded from 73% to 40% within four months in ambient soil.
• This natural biodegradable plastic offers a significant potential solution to the global plastic pollution crisis.

Biodegradable Plastic.jpg

Detailed Insights:

• The research involved collecting nest linings from Colletes inaequalis bees in eastern Tennessee, U.S., in March 2023.
• Initially, the newly formed nest lining was flexible and could be folded without fracturing, resembling synthetic polyester.
• Upon re-examination 11 months later, the same nest linings, which then contained pollen and larvae, were found to have cracked and crumbled, indicating substantial degradation.
• Conventional plastics, such as polythene, are highly persistent in the environment for centuries due to their stable carbon-carbon bonds.
• Previous efforts to create biodegradable polythene-like plastics have largely failed due to issues like crystallinity and water repellency.
• Despite Colletes bees nesting annually in aggregations of over 10,000 individuals, their polyester material does not accumulate in the environment over time.
• The biodegradable material is secreted from the female bees' abdomen, highlighting a natural process for sustainable material production.

Scientific/Technical Concepts Involved:

• Biodegradation: The process by which organic substances are broken down by microorganisms into simpler, environmentally benign compounds.
• Polyester: A synthetic polymer characterized by ester functional groups, widely used in plastics, fibers, and resins.
• Polythene (Polyethylene): A common thermoplastic polymer made from ethylene, known for its durability and widespread use in packaging, contributing significantly to plastic pollution.