Rapid soil degradation of a cross-linked, semicrystalline polyethylene-like polyester produced by Colletes bees.

Colletes inaequalis produces a cross-linked, highly crystalline PE-like polyester that loses most mass in ambient soil, with polyester content dropping from 73 to 40 wt% within 4 months.

• Why it matters: Conventional PE-like polyesters degrade poorly despite hydrolyzable esters, leaving a gap for materials that break down quickly under real environmental conditions.
• What they did: The polyester was characterized for insolubility, crystallinity (Xc = 60%, Tm = 75 °C), and network chemistry, then nest linings collected 0–11 months were analyzed for composition loss and tested for esterase activity using p-nitrophenylbutyrate.
• The result: Significant degradation occurs in ambient soil and esterase activity is present in both newly made and 4-month aged linings, supporting rapid environmental breakdown and informing next-generation biodegradable PE-like polymer design.

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