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Norsesquiterpene Glycosides in Bracken Ferns (Pteridium esculentum and Pteridium aquilinum subsp wightianum) from Eastern Australia: Reassessed Poisoning Risk to Animals.

Fletcher, M.T. and Brock, I.J. and Reichmann, K.G. and McKenzie, R.A. and Blaney, B.J. (2011) Norsesquiterpene Glycosides in Bracken Ferns (Pteridium esculentum and Pteridium aquilinum subsp wightianum) from Eastern Australia: Reassessed Poisoning Risk to Animals. Journal of Agricultural and Food Chemistry, 59 (9). pp. 5133-5138.

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Article Link(s): http://dx.doi.org/10.1021/jf104267c

Publisher URL: http://pubs.acs.org

Abstract

Austral bracken Pteridium esculentum contains three unstable norsesquiterpene glycosides: ptaquiloside, ptesculento-side, and caudatoside, in variable proportions. The concentration of each of the glycosides was determined in this study as their respective degradation products, pterosin B, pterosin G and pterosin A, by HPLC-UV analysis. Samples of P. esculentum collected from six sites in eastern Australia contained up to 17 mg of total glycoside/g DW, with both ptaquiloside and ptesculentoside present as major components accompanied by smaller amounts of caudatoside. Ratios of ptaquiloside to ptesculentoside varied from 1:3 to 4:3, but in all Australian samples ptesculentoside was a significant component. This profile differed substantially from that of P. esculentum from New Zealand, which contained only small amounts of both ptesculentoside and caudatoside, with ptaquiloside as the dominant component. A similar profile with ptaquiloside as the dominant glycoside was obtained for Pteridium aquilinum subsp. wightianum (previously P. revolutum) from northern Queensland and also P. aquilinum from European sources. Ptesculentoside has chemical reactivity similar to that of ptaquiloside and presumably biological activity similar to that of this potent carcinogen. The presence of this additional reactive glycoside in Australian P. esculentum implies greater toxicity for consuming animals than previously estimated from ptaquiloside content alone.

Item Type:Article
Additional Information:© American Chemical Society.
Keywords:Ptaquiloside; ptesculentoside; caudatoside; bracken; Pteridium esculentum; Pteridium aquilinum; cattle poisoning.
Subjects:Science > Biology > Biochemistry
Plant pests and diseases > Poisonous plants
Science > Botany > Cryptogams
Deposited On:07 Jun 2011 23:26
Last Modified:15 Jun 2011 06:59

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