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The Recovery of Microplastics from Rock Oysters Using Digestion Method
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Researchers tested three chemical digestion methods to extract microplastics from rock oyster tissue, comparing potassium hydroxide alone with combinations including hydrogen peroxide and sodium hypochlorite. Optimizing extraction methods for shellfish tissue is important because inconsistent protocols make it hard to compare microplastic contamination levels across different studies.
The widespread deposition of microplastics (<5.0 mm) in the marine environment has appeared to be pervasive across the globe. It has led to the major attention of many researchers to study this problem. Despite the amount of work conducted to understand these infamous microplastics, there is still no standard procedure for microplastics extraction from marine organism samples. This study investigated three types of digestion treatments; (1) KOH, (2) KOH/H2O2, and (3) KOH/NaClO, followed by density separation using 50% KI to extract the spiked microplastics from the rock oyster. Each treatment was tested to study the digestion effectiveness of the organic soft tissue materials while preserving the microplastic particles. Aside from recovering the spiked microplastics, other small contaminants have been detected in each treatment. All the spiked microplastics and the contaminants obtained were analyzed using a microscope and FT-IR for characterization. From this study, it was observed that each treatment resulted in high microplastics recovery. Among the three treatments, using 10% KOH alone provided the highest digestion rate, but it required more time to digest the oyster soft tissue. The contaminants detected in the oyster suggested the possibility of microplastics accumulation in non-digestion organs through adherence.
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This study compared several chemical digestion and extraction methods for isolating microplastics from mussel tissue, finding that hydrogen peroxide digestion followed by oil-based extraction achieved over 95% recovery across multiple plastic types. Optimized extraction methods are essential for accurately detecting microplastic contamination in shellfish that humans consume.
Evaluation of existing methods to extract microplastics from bivalve tissue: Adapted KOH digestion protocol improves filtration at single-digit pore size
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Researchers compared several existing methods for extracting microplastics from bivalve tissue, including hydrogen peroxide, enzymatic digestion, and potassium hydroxide treatments. They found that only the KOH method allowed filtration through very fine filters down to 1.2 micrometers when a neutralization step was added, enabling recovery of much smaller microplastics. The study recommends KOH digestion as the most practical extraction method for studies aiming to assess human exposure risk from consuming shellfish.
Prevalence of Microplastics in the Eastern Oyster Crassostrea virginica in the Chesapeake Bay: The Impact of Different Digestion Methods on Microplastic Properties
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Eastern oysters from three Chesapeake Bay sites were found to contain microplastics, with hydrogen peroxide and potassium hydroxide digestion methods yielding the highest recovery rates, while nitric acid produced satisfactory results with better microplastic preservation.
Evaluation of Digestion Methods in Microplastic Recovery from Mussels (Mytilus galloprovincialis) for a Standardised Microplastic Isolation Protocol
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Researchers compared two common chemical digestion methods for isolating microplastics from mussels, testing potassium hydroxide and hydrogen peroxide across a range of temperatures on samples spiked with known quantities of virgin microplastics. Both reagents provided good digestion efficiency, but recovery rates varied depending on temperature and exposure time. The study contributes toward standardizing microplastic extraction protocols for bivalve monitoring programs.
Microplastics extraction from oyster tissue v1
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Researchers developed and validated a protocol for extracting microplastics from oyster tissue, addressing the challenges of isolating plastic particles from a complex biological matrix that includes lipids, proteins, and mineral content. The method enables reliable quantification of microplastic contamination in bivalves — a widely consumed seafood and established bioindicator of coastal pollution — supporting standardised monitoring of microplastic uptake in marine food species.
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