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In vivo Efficacy of Ferrihydrite as an Enterosorbent for Arsenic: Short-Term Evaluation in Rodents.
MedLine Citation:
PMID:  23356646     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The use of dietary adsorbents to reduce arsenic (As) exposure is innovative. Ferrihydrite successfully sorbs arsenite and asenate over a wide range of pH conditions and the As-ferrihydrite complexes are stable in gastrointestinal (GIT) models. Our objectives were to (1) compare structural characteristics (using x-ray diffraction and Fourier-transform infrared [FTIR] spectroscopy) and As binding affinities of industrially produced ferrihydrite (IDF) and lab-synthesized ferrihydrite and (2) evaluate the efficacy of the material displaying the best sorption capability as an As enterosorbent in a short-term mammalian model. Lab-synthesized ferrihydrite displayed superior binding affinity for both arsenate and arsenite in vitro, which led to its use in the in vivo portion of the study. Young Sprague-Dawley male rats were fed either a control diet or a 0.5% w/w ferrihydrite feed. After 1 wk of acclimation, rats were given 0.5 ml of 500 mg/L arsenate or arsenite via gavage with or without ferrihydrite. Rats were then transferred to metabolism cages, and urine collected after 24 and 48 h was analyzed for total As. Rats were evaluated daily for signs of morbidity and mortality for up to 1 wk. Ferrihydrite reduced mean urinary As levels by 74.9% and 43.6% after 24 h and 49.1% and 39.5% after 48 h for arsenite- and arsenate-treated groups, respectively. Importantly, treatment groups receiving ferrihydrite displayed no signs of As-related toxicity. All As reductions were statistically significant except for arsenate treatments at 24 h. Data suggest that, as an enterosorbent, ferrihydrite reduces bioavailability after As exposures.
Authors:
John F Taylor; Abraham Robinson; Nicole J Mitchell; Alicia Marroquin-Cardona; Natalie Johnson; Sarah E Elmore; Amelia A Romoser; Timothy D Phillips
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of toxicology and environmental health. Part A     Volume:  76     ISSN:  1528-7394     ISO Abbreviation:  J. Toxicol. Environ. Health Part A     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100960995     Medline TA:  J Toxicol Environ Health A     Country:  England    
Other Details:
Languages:  eng     Pagination:  167-75     Citation Subset:  IM    
Affiliation:
a Veterinary Integrative Biosciences Department, College of Veterinary Medicine , Texas A&M University , College Station , Texas , USA.
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