Document Detail


Arsenic species and leaching characters in tea (Camellia sinensis).
MedLine Citation:
PMID:  17892910     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Tea is one of the most popular non-alcoholic beverages consumed in the world. Arsenic including species totalling to 47 Chinese tea samples from 18 tea-producing provinces in China were analyzed. By simulating the infusion process, leaching characters, effects of extraction time and temperature on arsenic extraction were investigated. Total amount of arsenic in tea leaf samples was in the range below the detection limit to 4.81 microg/g. Leaching of arsenic was strongly affected by extraction time and temperature. Because arsenic leaching ability by hot water was low and most of the arsenic was left in tea leaf residues after infusion, the concentration of arsenic in tea infusion was low even when some original tea leaf samples contained high level of arsenic. The major species in tea infusion were inorganic arsenic form (arsenite As(III) and arsenate As(V)). Compared with the amount of arsenic in infusion, more organic arsenic species were found in the original tea leaf samples. The contents of extractable inorganic arsenic in tea leaf samples were in the range below the detection limit to 226 ng/g. Considering ingestion dose and assuming one person (60 kg body weight) consumes 10 g of Chinese tea per day, the maximum inorganic arsenic contribution from tea infusion is 2.26 microg, which is equal to 0.038 microg/kg/d excluding water contribution. This value only accounts for 1.8% of provisional tolerable weekly intake (PTWI) (2.1 microg/kg/d) recommended by the Food and Agriculture Organization/World Health Organization [FAO/WHO, 1989. Evaluation of certain food additives and contaminants. Thirty-third Report of the Joint FAO/WHO Expert Committee on Food Additives. WHO Technical Report Series No. 776, Geneva, World Health Organization].
Authors:
Chungang Yuan; Erle Gao; Bin He; Guibin Jiang
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-06-16
Journal Detail:
Title:  Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association     Volume:  45     ISSN:  0278-6915     ISO Abbreviation:  Food Chem. Toxicol.     Publication Date:  2007 Dec 
Date Detail:
Created Date:  2007-10-29     Completed Date:  2007-12-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8207483     Medline TA:  Food Chem Toxicol     Country:  England    
Other Details:
Languages:  eng     Pagination:  2381-9     Citation Subset:  IM    
Affiliation:
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, 100085 Beijing, PR China.
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MeSH Terms
Descriptor/Qualifier:
Arsenic / chemistry*
Camellia sinensis*
Consumer Product Safety
Food Contamination*
Humans
Phytotherapy*
Plant Leaves
Tea / chemistry*
Chemical
Reg. No./Substance:
0/Tea; 7440-38-2/Arsenic

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


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