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Pyrrolizidine Alkaloids in Crotalaria Taxa from Northern Australia: Risk to Grazing Livestock.

Fletcher, M.T. and McKenzie, R.A. and Blaney, B.J. and Reichmann, K.G. (2008) Pyrrolizidine Alkaloids in Crotalaria Taxa from Northern Australia: Risk to Grazing Livestock. Journal of Agricultural and Food Chemistry, 57 (1). pp. 311-319.

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Article Link(s): http://dx.doi.org/10.1021/jf8026099

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

Abstract

Crotalaria species containing hepatotoxic pyrrolizidine alkaloids grow widely in pastures in northern Australia and have sporadically poisoned grazing livestock. The diverse Crotalaria taxa present in these pastures include varieties, subspecies, and chemotypes not previously chemically examined. This paper reports the pyrrolizidine alkaloid composition and content of 24 Crotalaria taxa from this region and assesses the risk of poisoning in livestock consuming them. Alkaloids present in C. goreensis, C. aridicola subsp. densifolia, and C. medicaginea var. neglecta lack the esterified 1,2-unsaturated functionality required for pyrrole adduct formation, and these taxa are not hepatotoxic. Taxa with high levels of hepatotoxic alkaloids, abundance, and biomass pose the greatest risk to livestock health, particularly C. novae-hollandiae subsp. novae-hollandiae, C. ramosissima, C. retusa var. retusa, and C. crispata. Other species containing moderate alkaloid levels, C. spectabilis and C. mitchellii, also pose significant risk when locally abundant.

Item Type:Article
Additional Information:© American Chemical Society.
Keywords:Gas chromatography−mass spectrometry; GC-MS; pyrrolizidine alkaloids; Crotalaria.
Subjects:Veterinary medicine > Veterinary toxicology
Plant pests and diseases > Weeds, parasitic plants etc
Deposited On:02 Dec 2010 06:21
Last Modified:30 Mar 2011 23:31

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