Linked Life Data

18161325

Source:http://linkedlifedata.com/resource/pubmed/id/18161325

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2007-12-28
pubmed:abstractText
L-Theanine is a unique non-protein amino acid in tea, and shows many physiological functions. To directly extract L-theanine from tea is a lengthy and very costly process. Although the chemical synthesis of theanines is simple, the product is unfortunately a mixture of DL-enantiomers. A chiral derivatization method was developed for the separation and quantification of theanine enantiomers by reversed-phase high performance liquid chromatography (RP-HPLC). 1-Fluoro-2,4-dinitrophenyl-5-L-alanine amide (FDAA)was used as the chiral reagent. This method showed good linearity for both L-theanine (ranging from 1.732 x 10(-3) to 2.077 microg) and D-theanine (ranging from 1.696 x 10(-3) to 2.044 microg). The recoveries were in the range of 97.3% - 102.0% for L-theanine and 97.2% - 103.2% for D-theanine. This method also showed excellent limit of detection (approximately 5 x 10(-4) microg) and limit of quantification (approximately 1 x 10(-3) microg) for both L-theanine and D-theanine. The results demonstrated that this method is precise, accurate and can be used for the determination of theanine enantiomers.
pubmed:language
chi
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
1000-8713
pubmed:author
pubmed:issnType
Print
pubmed:volume
25
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
719-22
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
[Separation and quantification of theanine enantiomers using high performance liquid chromatography coupled with chiral derivatization].
pubmed:affiliation
Institute of Natural Products, Hunan Agricultural University, Changsha 410128, China.
pubmed:publicationType
Journal Article, English Abstract