Oxidation products of betulin: New tracers of abiotic degradation of higher plant material in the environment

Galeron, Marie-Aimée; Volkman, John K.; Rontani, Jean‐François

doi:10.1016/j.orggeochem.2015.10.010

Cited by 10 publications

(21 citation statements)

References 56 publications

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“…These results highlighted the need for a set of tracers specific enough to pinpoint the origin of organic matter and with identified oxidation products specific to degradation processes we are looking at here. For this purpose, we previously studied and identified a number of tracers which, coupled with their degradation products, formed a specific set allowing us to unambiguously attribute a higher‐plant terrestrial origin to the suspended particulate matter we are studying [ Galeron et al ., , ; Rontani et al ., ].…”

Section: Methodsmentioning

confidence: 99%

“…Preliminary studies on the Rhône River [ Galeron et al ., ] highlighted the involvement of autoxidation in terrestrial organic matter during riverine transport but also evidenced the lack of unambiguous tracers allowing us to determine the origin of TPOM as well as to pinpoint the degradative processes it has undergone. With this challenge in mind, we developed a set of terrestrial tracers specific enough to distinguish between different types of higher‐plant organic matter sources (angiosperms versus gymnosperms) but also allowing us to identify the type of oxidative damages endured by POM [ Galeron et al ., , ; Rontani et al ., ].…”

Section: Introductionmentioning

confidence: 99%

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Autoxidation as a major player in the fate of terrestrial particulate organic matter in seawater

et al. 2017

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The Rhône River plays a major role in the Mediterranean Sea, being both its main freshwater source and its major particulate matter provider. This survey of the fate of terrestrial particulate organic matter (POM) was conducted along the salinity gradient of the Rhône River plume, between 2012 and 2014. It revealed that autoxidation acts rapidly and intensely upon the POM's arrival at sea, with α‐amyrin and β‐amyrin autoxidation rates going from 12.9 ± 2.9% to 45.0 ± 6.4% and 10.7 ± 4.0% to 50.3 ± 4.4%, respectively, between fresh water (salinity 0) and seawater (salinity 38). These compounds, being unambiguous markers of the terrestrial origin of POM, allow us to unequivocally characterize the POM as terrestrial. While it was originally believed that a desorption of redox‐active trace metal ions was the favoring factor that kick‐started this intense autoxidation, this study evidences no trace metal desorption in the Rhône River mixing zone and hence no correlation between high autoxidation rates and the presence of trace metal ions. Autoxidation rates however were very well correlated with salinity levels within the river plume, with r2 reaching 0.801, 0.962, and 0.943 for sitosterol, α‐amyrin, and β‐amyrin, respectively, in November 2014.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Autoxidation as a major player in the fate of terrestrial particulate organic matter in seawater

et al. 2017

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“…In light of recent observations made in the Rhône River [5] and during in vitro experiments [9,10], we selected a set of lipid tracers allowing us to trace both the origin of SPM and the degradative processes undergone by lipids in SPM.…”

Section: Tracers Usedmentioning

confidence: 99%

“…Betulin and both amyrins are also unambiguous tracers of terrestrial vascular plants [9,10]. It has been long known that transition metals can catalyze autoxidation in biological systems [7,8], but could there be other drivers in the environmental systems?…”

Section: Tracers Usedmentioning

confidence: 99%

“…Also, because of the set of lipid tracers used, it is clear that the autoxidative processes observed acted on SPM of terrestrial origin [9,10]. It has been demonstrated that autoxidation is induced when particulate matter is incubated in seawater, and this was explained by the potential desorption of metallic ions upon contact with seawater [6].…”

Section: Rhone River Spm Incubationsmentioning

confidence: 99%

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Metal Ions and Hydroperoxide Content: Main Drivers of Coastal Lipid Autoxidation in Riverine Suspended Particulate Matter and Higher Plant Debris

Galeron

Radakovitch

Charrìère

et al. 2016

JMSE

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Autoxidation is a complex abiotic degradation process, and while it has long been known and well studied in biological compounds, it has been widely overlooked in environmental samples and as a part of environmental processes. With recent observations showing the magnitude of the involvement of autoxidation in coastal environments, it has become critical to better understand how and why this degradative process takes place. At the riverine/marine interface, recent findings evidenced a spike in autoxidation rates upon the arrival of suspended particulate matter in seawater. In this study, we aimed at identifying autoxidation-favoring factors in vitro by analyzing suspended particulate matter incubated under different conditions. If metal ions have long been known to induce autoxidation in biological systems, we show that they indeed induce autoxidation in particulate matter incubated in water, but also that the content in photochemically-produced hydroperoxides in suspended particulate matter is crucial to the induction of its autoxidation in water.

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Recent Developments on the Synthesis and Applications of Betulin and Betulinic Acid Derivatives as Therapeutic Agents

Jonnalagadda

Suman

Morgan

et al. 2017

Studies in Natural Products Chemistry

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Oxidation products of betulin: New tracers of abiotic degradation of higher plant material in the environment

Cited by 10 publications

References 56 publications

Autoxidation as a major player in the fate of terrestrial particulate organic matter in seawater

Autoxidation as a major player in the fate of terrestrial particulate organic matter in seawater

Metal Ions and Hydroperoxide Content: Main Drivers of Coastal Lipid Autoxidation in Riverine Suspended Particulate Matter and Higher Plant Debris

Recent Developments on the Synthesis and Applications of Betulin and Betulinic Acid Derivatives as Therapeutic Agents

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