-Caveat Lector-
Begin forwarded message:
From: [EMAIL PROTECTED]
Date: July 17, 2007 8:35:09 AM PDT
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED]
Subject: No Escaping Poisoned Foodchain: Chemical Waste Absorbed by
Fruits & Vegetables
12 July 2007
Antibiotics Absorbed By Vegetables
http://www.scienceagogo.com/news/20070611194357data_trunc_sys.shtml
Evaluating the impact of livestock antibiotics on the environment,
University of Minnesota researchers have found that many vegetables
uptake the antibiotics. The study, in the Journal of Environmental
Quality, shows that food crops can readily accumulate antibiotics
from soils spread with cattle manure.
The findings were based on a greenhouse study involving three food
crops: corn, lettuce, and potatoes. The plants were grown in soil
modified with liquid hog manure containing sulfamethazine, a
commonly used veterinary antibiotic. The researchers found that the
antibiotic was taken up by all three crops.
The antibiotic was found in the plant leaves and concentrations in
the plant tissue increased as the amount of antibiotic present in
the manure increased. Worryingly, it also diffused into potato
tubers, which suggests that other root crops - such as carrots and
radishes - may be particularly vulnerable to antibiotic contamination.
Researcher Satish Gupta said that contaminated plants had the
potential to cause allergic reactions in people with antibiotic
sensitivity. He also noted that contamination is likely to foster
antimicrobial resistance, which can render antibiotics ineffective.
And co-researcher Holly Dolliver warned that antibiotic
contaminated plants may be of particular concern to the organic
farming industry, where manure is often the main source of crop
nutrients.
While the USDA stipulates that organic producers must manage animal
materials in a manner that does not contribute to contamination of
crops by residues of prohibited substances, manures containing
antibiotics are not formally banned or prohibited. Dolliver
concluded that further research is needed to investigate how
different plants absorb different antibiotic compounds.
Related articles:
Prevalence Of Antibiotic Resistance Surprises
Prof Ponders Bacterial Benefits
Down On The Farm: Yields, Nutrients And Soil Quality
Increasing Soil Erosion Threatens World's Food Supply
Source: Soil Science Society of America
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