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Storage-Dependent Changes in Microplastic-Associated Recoverable Residues in Yogurt Containing Bifidobacterium longum subsp. infantis
Original title: Storage-Dependent Changes in Microplastic-Associated Recoverable Residues in Yogurt Containing Bifidobacterium longum subsp. infantis
Summary
Scientists tested whether tiny plastic bits (microplastics) in yogurt change when a common probiotic bacteria is present, storing samples for three weeks in the fridge. They found that less plastic residue could be measured over time in yogurt with the probiotic, but this doesn't necessarily mean the plastic was broken down or destroyed—it may just be harder to detect using their methods. This is early, exploratory lab research, so it can't yet tell us whether eating probiotic yogurt actually reduces microplastic exposure in real life—more research is needed before drawing conclusions about human health.
Microplastics (MPs) are increasingly detected in dairy products, raising food-safety concerns. Their behavior in complex food matrices and interactions with probiotic microorganisms remain poorly understood. This exploratory study evaluated storage-dependent changes in operationally defined, digestion-resistant recoverable residues in yogurt containing Bifidobacterium longum subsp. infantis (ATCC 15697). Yogurt samples were prepared with polypropylene (PP), polyethylene (PE), and polystyrene (PS), individually and in combination, and analyzed over 21 days of refrigerated storage. Gravimetric values served as relative, operational indicators of recoverable residues—not validated absolute polymer masses—while polymer identity was qualitatively confirmed by pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS). B. longum subsp. infantis remained viable throughout storage (6.3–8.2 log10 CFU/g). All MP-containing groups showed consistent storage-associated decreases in recoverable residue fractions, greatest in PP, followed by PE and PS; probiotic-free controls remained stable. Polymer-specific Py-GC/MS signals were detectable at all time points. Because polymer identity was retained and the workflow was not validated for absolute recovery, findings are interpreted as storage-associated changes in extractability, filterability, and/or residue recovery—not as polymer degradation, mineralization, or biological removal. These in vitro observations are limited to the yogurt matrix and do not support extrapolation to livestock exposure, human dietary risk, or farm-to-fork transfer. Within these limits, the findings provide a preliminary, hypothesis-generating perspective on probiotic–microplastic interactions in fermented dairy products.