Identification of microplastics in white wines capped with polyethylene stoppers using micro-Raman spectroscopy

•Suspected microplastics are present in white wines up to 5,857 particles L−1.•Micro-Raman spectroscopy confirmed microplastic presence in all bottles except two.•Median dimensions of microplastics were 26 × 122 µm.•The blue laser (442 nm) in spectroscopy allowed better signal to noise ratio.•A reduction in filtered volume is preferred to 15% H2O2 treatment.