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Dissipation of Pterosin B in Acid Soils - Tracking the Fate of the Bracken Fern Carcinogen Ptaquiloside

Dissipation of Pterosin B in Acid Soils - Tracking the Fate of the Bracken Fern Carcinogen Ptaquiloside

Eirini Skourti-Stathaki, Frederik Clauson-Kaas, Kristian Koefoed Brandt, Lars Holm Rasmussen, Hans Christian Bruun Hansen

Chemosphere. 2016 Dec;165:453-459.

PMID: 27677121

Abstract:

Bracken ferns (Pteridium spp.) are well-known for their carcinogenic properties, which are ascribed to the content of ptaquiloside and ptaquiloside-like substances. Ptaquiloside leach from the ferns and may cause contamination of drinking water. Pterosin B is formed by hydrolysis of ptaquiloside. In soil, Pterosin B is adsorbed more strongly and it is expected to have a slower turnover than ptaquiloside. We thus hypothesized that pterosin B may serve as an indicator for any past presence of ptaquiloside. Pterosin B degradation was studied in acid forest soils from bracken-covered and bracken-free areas. Soil samples were incubated with pterosin B at 3 and 8 μg g-1 for 10 days, whereas sterile (autoclaved) samples were incubated for 23 days. Pterosin B showed unexpected fast degradation in soils with full degradation in topsoils in 2-5 days. Pterosin B dissipation followed the sum of two-first order reactions. The initial fast reaction with half-lives of 0.7-3.5 h contributed 11-59% of the total pterosin B degradation, while the slow reaction was 20-100 times slower than the fast reaction. Total dissipation half-lives were shorter for loamy sand (4 h) than for sandy loam soils (28 h). No degradation of pterosin B took place under sterile conditions assuming observed dissipation during the first 3 h could be attributed to irreversible sorption. Our results demonstrate that pterosin B is microbially degraded and that pterosin B is as unstable as ptaquiloside and hence cannot be used as an indicator for former presence of ptaquiloside in soil.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP34175967	Pterosin B		34175-96-7	Price

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