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Scientists Turn Plastic Waste Into Edible Cookies Because That’s the Future We Deserve (futurism.com)
submitted 2 days ago by to c/nottheonion@lemmy.world
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Are we eating enough plastic already?

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[–] 17 points 2 days ago* (2 children)

Yes, I'm assuming that this is being done in a lab environment without purpose-built equipment, and also that developing the specialized yeast strain was part of the cost.

Assuming that the genetic change is stable and that the yeast is self-propagating like normal yeast, then engineering the rest of it into an assembly line shouldn't be too difficult and should bring the cost down by orders of magnitude.

Plus, if we can turn the output hydrocarbons into a viable market product then the recycler can offset the operating cost, which would make this even more interesting. Right now plastic recycling is just losses.

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  • [–] 3 points 2 days ago* (2 children)

    Assuming that the genetic change is stable and that the yeast is self-propagating like normal yeast, then…

    …we will have to stop using so much plastic, because it won’t be reliable shelf stable packaging one the yeast that eats it is loose.

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  • [–] 4 points 2 days ago (1 child)

    Possibly, but:

    Before the yeast can start feasting, the PET plastics are subjected to a process called oxidative hydrothermal dissolution to break them down into smaller bits that the microbes can digest.

    "Oxidative hydrothermal dissolution" - basically they boil the plastic and oxidize it, I think at the same time. Maybe hydrogen peroxide + water? Essentially this is kind of an accelerated aging.

    Anyway, the yeast can't eat the plastic without some processing first, which is probably good because it means existing plastic packages won't just start falling apart. On the other hand if this does get loose, it might be able to eat any PET litter that has started breaking down in the environment due to exposure to sun, rain, ocean water, etc. The absolute easiest waste for this to eat would be any PET that has broken down into microplastic particles and ended up in soil or water, which would be kind of an ideal situation.

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  • [–] 3 points 1 day ago

    Evolution finds a way.

    But seriously I thought the article implied the oxidation process just made the particle smaller so they’d have more surface area and get consumed quicker. Even if it’s slow, won’t the yeast that have a taste for PET still want to grow on it, like they do with bread.

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