Can I reuse corn-based plastic containers?
Trust it as much as you’d trust any packaging plastic, meaning maybe not so much as you probably are, because plastic isn’t really inert. Generally it’s not the primary polymer so much as the performance additives, and I know they do put additives in PLA. PLA has nothing to do with corn, chemically. There is nothing in it you’d recognize as corn. And while biodegradable plastics (to be certified thus by, say, ASTM) are supposed to break down into constituents nontoxic to the ecosystem, well, you know, you’d think plastics wouldn’t be supposed to be leaching hormone-mimicking compounds into every corner of the globe. But they do. On the other hand I don’t fret too much about it and I had to learn a ton about it all, a long time ago. I don’t worry about short term storage but I’m increasingly reluctant to reheat food in plastic. As a short term storage package feel free to reuse this stuff as you would a polyethylene container.
