期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 786, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.147455
关键词
Enzymatic purification; Hydrogen peroxide; Chitin exoskeleton; Terrestrial organisms; Microplastic analysis
资金
- Danish Innovation Fund [703800190B]
- NIVA Denmark
This study tested four protocols for dissolving chitinaceous organisms and found that using H2O2 followed by chitinase was a highly efficient method. Other protocols either did not digest chitin sufficiently or negatively affected the tested polymers. Recovery tests showed high recovery rates, supporting the applicability of the H2O2 and chitinase method for dissolving chitinaceous organisms.
Chitinaceous organisms have been found to ingest microplastic: however, a standardised, validated, and time-and cost-efficient method for dissolving these organisms without affecting microplastic particles is still required. This study tested four protocols for dissolving organisms with a chitin exoskeleton: 1) potassium hydroxide (KOH) + chitinase, 2) Creon (R) + chitinase, 3) hydrogen peroxide (H2O2) chitinase, and, 4) Nitric Acid (HNO3) + hydrogen peroxide (H2O2). The effects on microplastics composed of eight different polymers were also tested. The use of H2O2 followed by chitinase was found to be a highly efficient method. The three other protocols either did not digest the chitin sufficiently or negatively affected the tested polymers. A recovery test using microplastic fibres, beads and tyre particles revealed high recovery rates of 0.85,0.89 and 1 respectively. This further supported the applicability of the H2O2 and chitinase (protocol 3) for dissolving chitinaceous organisms. Thus, we recommend that future investigations of microplastic (0.05 mu m-5000 mu m) in chitinaceous organisms (0.3 cm-5 cm) utilise the here presented methodology. This represents an important component of the ongoing validation and harmonization of methodological approaches that are urgently needed for the advancement of microplastic assessments globally. (C) 2021 The Author(s). Published by Elsevier B.V.
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