Weathered plastic bits carry more drug residue into lettuce
Dong Y, Junzhe W, Mai K, Yu W, Xiao Z
Phytoremediation
If you grow lettuce or leafy greens near roadside runoff or reused irrigation water, this shows that sun-weathered microplastic fragments can act like tiny sponges that concentrate pharmaceutical residues and deliver them straight into the leaves you'd eat.
Scientists found that when tiny plastic particles sit out in sunlight and weather like plastic litter does in real life, they become much better at soaking up a heart medicine called propranolol from water. Lettuce grown in that water absorbed more of the drug into its roots and leaves, and depending on how much plastic was present, the plastic either softened or worsened the drug's harm to the plant's growth, stress levels, and the helpful bacteria living inside it. In other words, old, sun-beaten plastic bits aren't just inert litter, they change how pollutants move into the food we grow.
Key Findings
UV-aged nanoplastics absorbed more propranolol than pristine ones, likely due to increased surface oxidation and surface area, leading to up to 69.4% higher drug levels in lettuce leaves.
Propranolol alone cut chlorophyll a by 31.3% and leaf dry weight by 21.5%, while triggering oxidative stress and disrupting nitrogen metabolism.
Low nanoplastic doses (5 mg/L) partially offset propranolol's toxicity, but high doses (50 mg/L) combined with aged particles worsened oxidative damage and nitrogen metabolism disruption, and shifted root versus leaf microbial communities differently.
chevron_right Technical Summary
Sunlight-aged plastic nanoparticles in water pick up more of a common heart medication and ferry it into lettuce leaves and roots, and depending on how much plastic is present, this either eases or worsens the drug's damage to the plant's growth and internal microbes.
Abstract Preview
Original paper
Aging alters nanoplastics-propranolol interactions in lettuce: implications for plant toxicity and microbiomes.
This study investigated whether UV aging and surface functionalization of polystyrene nanoplastics (NPs) modify their interactions with propranolol (PRO) and affect lettuce physiology and endophyti...
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