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Changes in Flavor-Related Biomarkers in Pacific Oysters (Crassostrea gigas) Following Microplastic Exposure
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Researchers exposed Pacific oysters to different concentrations of microplastics for 15 days and then measured changes in flavor-related compounds. They found that microplastic exposure altered the oysters' odor characteristics and amino acid profiles, with moderate concentrations actually increasing the umami taste value. The study raises new questions about how microplastic contamination might affect the quality and safety of commercially important shellfish.
Microplastics have been an emerging threat to filtering species and the ingestion and impacts of microplastics on oysters are a cause for concern. However, much remains unknown about the effects of microplastics on flavor-related biomarkers in oysters. Herein, a laboratory microplastic exposure with concentrations of 1, 10, and 100 mg/L for 15 days was performed to investigate the impacts of microplastics on the flavor parameters of oysters. Exposure to microplastics changed the odor characteristics of oysters. Microplastic exposure had minor effects on the fatty acid composition; however, significant alterations in free amino acids and nucleotides were observed under the 1 and 10 mg/L exposure groups, respectively. The overall results indicated 10 mg/L of microplastic exposure significantly increased the equivalent umami value of oysters. These findings stressed the effects of microplastics on oysters and would be an important reference for the assessment of the potential risks associated with microplastics in marine edible species.
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Metabolic profiles and protein expression responses of Pacific oyster (Crassostrea gigas) to polystyrene microplastic stress
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Researchers exposed Pacific oysters to polystyrene microplastics for 21 days and found the particles caused oxidative stress and disrupted the oysters' metabolism, particularly amino acid processing. Different microplastic concentrations triggered different metabolic changes in the oysters. Since oysters are a popular seafood, these findings raise questions about food safety and whether microplastic-stressed shellfish could affect consumer health.
Survival Costs Flavor: Microplastics Reprogram Metabolic Resource Allocation and Compromise Oyster Quality under Ocean Acidification.
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Pacific oysters exposed to ocean acidification and microplastics in a lab study showed reduced texture quality, depleted protein and lipid reserves, and changes in flavor-related compounds. Gene activity analysis showed the oysters shifted energy toward cellular repair and stress responses, using up nutrients otherwise linked to taste and nutritional quality.
Tissue-specific accumulation and integrated toxicological responses of the Pacific oyster, Crassostrea gigas, to chronic polyethylene microplastic exposure: An empirical toxicokinetic interpretation
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Scientists found that oysters exposed to microplastics for weeks build up the most plastic in their digestive glands, and this buildup was linked to stress hormones, liver-related enzymes, and immune changes. Since oysters are widely eaten, this suggests microplastic pollution could affect the health and safety of seafood, though more research is needed to know what this means for humans.
Microplastic Contamination in Pacific Oysters (Crassostrea gigas) from Haizhou Bay: Tissue-Specific Distribution, Digestive Enzyme Dysfunction, and Lipid Metabolism Perturbation
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This study systematically evaluated microplastic distribution in Pacific oysters from Haizhou Bay, China, finding MP contamination across all tissues examined and documenting that MP accumulation altered digestive enzyme activities and fatty acid metabolism in these commercially harvested shellfish.
Effects of ocean acidification and polystyrene microplastics on the oysters Crassostrea gigas: An integrated biomarker and metabolomic approach
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Researchers exposed oysters to polystyrene microplastics of two sizes under both normal and acidified ocean conditions to simulate climate change. They found that ocean acidification and microplastics interacted in complex ways, with smaller microplastics under acidic conditions altering the oysters' metabolic profiles in their digestive organs. This study highlights that climate change may change how microplastics affect the shellfish many people eat.
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