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Updated: Jun 2, 2026
Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
Published on: December 16, 2016
Evaluation of Digestion Methods in Microplastic Recovery from Mussels (Mytilus galloprovincialis) for a Standardised
Flavia Capuozzo1, Nicoletta Cristiana Quaglia1, Angela Di Pinto1
1Unit of Safety of Food of Animal Origin, Department of Veterinary Medicine, University of Bari Aldo Moro, 70010 Valenzano, Italy.
Abstract:
Although microplastics are known as bivalve mollusc contaminants, the standardisation of isolation protocols hasn't been developed yet. This study aims at assessing the best microplastic recovery rates and digestion efficiencies, applying two chemical reagents (10% KOH and 30% H2O2) across a wide range of known temperatures, on mussels (Mytilus galloprovincialis) contaminated with virgin microplastic standards. Both reagents provided good digestion efficiencies, but microplastic recovery was optimised employing 30% H2O2 at 50-60 °C, which also preserved polymer integrity. Indeed, recovery rates ranged from 88.75 to 91.86% at 50 and 60 °C, respectively, whereas 85.8 and 99.4% were the values of the digestion efficiency at 50 and 60 °C, respectively. Flotation and supernatant fractionation were found to be decisive parameters in maximising microplastic recovery; therefore, they shouldn't be overlooked. These findings lay the foundations for standardising microplastic isolation protocol from mussels, allowing for the reproducibility of data and consequently the comparison of different laboratories' results in order to concretely assess the risk for consumer health and lead to determining the benchmarks for food safety policymaking. Further studies are needed to standardise the method for the detection of microplastics from other foods.
Insights
This study optimized microplastic isolation from mussels using hydrogen peroxide (H2O2) at 50-60°C, achieving high recovery rates. This method aids in standardizing microplastic analysis for food safety assessments.
Area of Science:
- Environmental Science
- Food Science
- Analytical Chemistry
Background:
- Microplastics are prevalent contaminants in bivalve molluscs like mussels.
- Standardized protocols for microplastic isolation from mussels are currently lacking.
- Accurate quantification is crucial for assessing consumer health risks.
Purpose of the Study:
- To evaluate and optimize microplastic recovery rates and digestion efficiencies.
- To compare chemical digestion methods (KOH vs. H2O2) at various temperatures.
- To establish a foundation for a standardized microplastic isolation protocol for mussels.
Main Methods:
- Mussels (Mytilus galloprovincialis) were experimentally contaminated with microplastic standards.
- Two chemical reagents, 10% potassium hydroxide (KOH) and 30% hydrogen peroxide (H2O2), were tested.
- Digestion efficiency and microplastic recovery were assessed across a range of temperatures.
Main Results:
- Both 10% KOH and 30% H2O2 demonstrated good digestion efficiencies.
- 30% H2O2 at 50-60°C optimized microplastic recovery (88.75-91.86%) while preserving polymer integrity.
- Digestion efficiencies reached 85.8% (50°C) and 99.4% (60°C) with H2O2.
- Flotation and supernatant fractionation significantly enhanced microplastic recovery.
Conclusions:
- Optimized protocol using 30% H2O2 at 50-60°C provides high recovery and digestion efficiency for microplastics in mussels.
- Standardization of this protocol will enable data reproducibility and inter-laboratory comparison.
- This research supports improved food safety policymaking regarding microplastic contamination.
