Current limitations of biodegradation screening tests and prediction of biodegradability: A focus on fragrance substances

Dick, Christophe; Rey, Sylvain; Boschung, Alain; Miffon, F; Seyfried, Markus

doi:10.1016/j.eti.2016.03.002

Cited by 18 publications

(11 citation statements)

References 31 publications

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“…RBTs do not reflect environmental conditions and are not realistic, as they cannot predict mineralization rates under environmentally relevant conditions (Federle, Gasior, & Nuck, 1997), and can only identify easily biodegradable chemicals in batch culture. Furthermore, extensive research has demonstrated that RBTs (including the OECD series) suffer from several problems that lead to a high variability in the testing results and to difficulties in their interpretation (Dick, Rey, Boschung, Miffon, & Seyfried, 2016;Howard & Banerjee, 1984;Kowalczyk et al, 2015;Thouand et al, 2011;van Ginkel et al, 2008). Some of these variabilities are understood and can be attributed to differences in specific factors, such as the temperature or the oxygen concentration (Greskowiak, Hamann, Burke, & Massmann, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…One of the major reported factors causing variability in the RBTs is the source of the inoculum (Dick et al, 2016;Martin et al, 2017;Mezzanotte, Bertani, Innocenti, & Tosin, 2005;Thouand, Capdeville, & Block, 1996;Thouand et al, 2011;V azquez-Rodr ıguez, Garab etian, & Rols, 2007). The quality of the inoculum is affected by i) the total cell density (Blok & Booy, 1984;Martin et al, 2017;Thouand et al, 1995;V azquez-Rodr ıguez et al, 2007), ii) the diversity of the community (Forney et al, 2001), iii) the ratio between nutrients and biomass (F/M ratio) (Vazquez-Rodriguez, Palluy, Goma, & Rols, 1999), and iv) the origin and exposure history (Itrich et al, 2015;Kim et al, 2017;Mezzanotte et al, 2005;Thouand et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Implications of microbial adaptation for the assessment of environmental persistence of chemicals

Poursat

Spanning

Voogt

et al. 2019

Critical Reviews in Environmental Science and Technology

105

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Persistency of organic chemicals is a key property in their environmental risk assessment. Information on persistency is often derived from the results of biodegradability screening tests such as the ready biodegradability tests (RBTs). RBTs are, however, not designed for this purpose and suffer from several problems that lead to a high variability of the results and, hence, to difficulties in their interpretation. The origin and exposure history of the inocula used for biodegradability testing can lead to highly variable outcomes. Microbial adaptation to chemicals and its impact on biodegradation needs further investigation in order to have a better understanding of their effects on persistency assessments of chemicals. It is well described that microbial adaptation stimulates biodegradation of organic chemicals. Several mechanisms responsible for these phenomena have been described, amongst which are i) shifts in community composition or abundances, ii) mutations within populations, iii) horizontal gene transfer or iv) recombination events. These adaptation processes may well be mimicked under laboratory conditions, but the outcome remains difficult to predict as we lack a fundamental understanding of the adaptive responses. This review aims to bring together our current knowledge regarding microbial adaptation and its implication for the testing of biodegradation of chemicals. Abbreviations BHRBroad host range plasmid HGT

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Implications of microbial adaptation for the assessment of environmental persistence of chemicals

Poursat

Spanning

Voogt

et al. 2019

Critical Reviews in Environmental Science and Technology

105

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“…Purified shell materials were tested for biodegradability using an adaptation of the OECD 301F guideline [21], as described previously [24].…”

Section: Biodegradation Experimentsmentioning

confidence: 99%

Quantification of Residual Perfume by Py-GC-MS in Fragrance Encapsulate Polymeric Materials Intended for Biodegradation Tests

et al. 2020

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Perfume encapsulates are widely used in commercial products to control the kinetic release of odorant molecules, increase storage stability and/or improve deposition on different substrates. In most of the cases, they consist of core-shell polymeric microcapsules that contain fragrance molecules. A current challenge is to design and produce polymeric materials for encapsulation that are both resistant and non-persistent. The selection of such eco-friendly formulations is linked to a deep understanding of the polymeric material used for encapsulation and its biodegradation profile. To collect this information, pure samples of capsule shells are needed. In this article we present an innovative quantification method for residual volatiles based on pyrolysis-GC-MS to enable validation of sample quality prior to further testing. The presented analytical method also led to the development of a robust and comprehensive purification protocol for polymers from commercial samples. Standard techniques are not suited for this kind of measurement due to the non-covalent embedding of volatiles in the 3D structure of the polymers. We demonstrated the confounding impact of residual volatiles on the estimated biodegradability of fragrance encapsulates.

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“…inert materials as sand). However, inert matrixes request the use of inoculum [ 5 ] which might be the greater source of variability in respirometric assays [ 24 ].…”

Section: Additional Informationmentioning

confidence: 99%

Methodology for soil respirometric assays: Step by step and guidelines to measure fluxes of trace gases using microcosms

et al. 2018

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Current limitations of biodegradation screening tests and prediction of biodegradability: A focus on fragrance substances

Cited by 18 publications

References 31 publications

Implications of microbial adaptation for the assessment of environmental persistence of chemicals

Implications of microbial adaptation for the assessment of environmental persistence of chemicals

Quantification of Residual Perfume by Py-GC-MS in Fragrance Encapsulate Polymeric Materials Intended for Biodegradation Tests

Methodology for soil respirometric assays: Step by step and guidelines to measure fluxes of trace gases using microcosms

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