Document Detail

Ingestion of toxic Microcystis aeruginosa by dairy cattle and the implications for microcystin contamination of milk.
MedLine Citation:
PMID:  11600147     Owner:  NLM     Status:  MEDLINE    
Microcystin (MCYST) toxins can be produced by the bloom-forming cyanobacterium Microcystis aeruginosa. They are chemically stable compounds and have both acute and chronic effects on the health of mammals, including cattle and humans. Cattle will drink water containing lethal cell concentrations of M. aeruginosa. When cattle consume sub-lethal doses of microcystins, the fate of those toxins is unknown. We provided drinking water containing 1 x 10(5) cells ml(-1) M. aeruginosa (strain MASH01-A19) to four lactating Holstein-Friesian dairy cattle for 21 days to determine if MCYST-LR produced by the cyanobacteria, could be detected in milk produced by the cattle. Cattle consumed up to 15 mg MCYST-LR at an ingestion rate of 1.21 microg kg (live weight) d(-1). Analysis by HPLC and ELISA indicated that no detectable amounts of microcystin from the cyanobacteria were present in the milk obtained from the treated animals. Based on the level of quantitation of the ELISA analyses, the maximum possible concentration in the milk was less than 2 ng l(-1). This is more than three orders of magnitude less that the concentration that could be considered problematic for milk of 0.86 microg l(-1) which we calculated using the World Health Organization derived tolerable daily intake for MCYST-LR and the per capita daily consumption of milk in Australia.
P T Orr; G J Jones; R A Hunter; K Berger; D A De Paoli; C L Orr
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Toxicon : official journal of the International Society on Toxinology     Volume:  39     ISSN:  0041-0101     ISO Abbreviation:  Toxicon     Publication Date:  2001 Dec 
Date Detail:
Created Date:  2001-10-15     Completed Date:  2001-12-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1307333     Medline TA:  Toxicon     Country:  England    
Other Details:
Languages:  eng     Pagination:  1847-54     Citation Subset:  IM    
CSIRO Land and Water, 120 Meiers Rd, Indooroopilly, Queensland, 4068, Australia.
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MeSH Terms
Bacterial Toxins / analysis,  pharmacokinetics*
Chromatography, High Pressure Liquid
Enzyme-Linked Immunosorbent Assay
Food Microbiology*
Microcystis / physiology*
Milk / chemistry,  metabolism*
Peptides, Cyclic / analysis
Water Supply
Reg. No./Substance:
0/Bacterial Toxins; 0/Microcystins; 0/Peptides, Cyclic; 77238-39-2/microcystin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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