I am preparing feather samples for stable isotope analysis and as part of the cleaning regime they must be soaked in 2:1 chloroform:methanol solution for 24h to remove oils and surface contaminants. Some of the feathers were unintentionally placed in plastic falcon tubes instead of glass, and the tubes have become slightly misshapen.

Will the feather samples now be contaminated by the plastic? Is it possible to re-soak them in fresh solution to remove any residue, or should I discard these samples?

Thanks for your advice.