Response factor considerations for the quantitative analysis of western redcedar (Thuja plicata) foliar monoterpenes.
J Chromatogr Sci
; 43(5): 253-8, 2005.
Article
em En
| MEDLINE
| ID: mdl-15975244
ABSTRACT
A method is described for quantitative analysis of monoterpenes in western redcedar (Thuja plicata) foliage by gas chromatography with flame ionization detection. Response factors for monoterpenes identified in redcedar are evaluated to determine similarities among monoterpene responses. Evaluation demonstrates that redcedar monoterpenes yield detector responses that fall into two groups. One monoterpene from each group is used as a standard for quantitative analysis. Redcedar monoterpenes are quantitated by comparing analyte response with the response factor of one of the standards in single-point calibrations. Homogenized foliage samples are extracted with ethyl acetate and the extracts passed through a solid phase extraction column of graphitized carbon to remove plant pigments. Method bias and repeatability are evaluated by fortifying foliage samples with (1S)-(+)-carvone and (1S)-(+)-2-carene and subjecting the samples to the extraction and analysis procedures. Detection limits are also assessed from fortified samples. Excellent recovery (> 95.0%) and precision (< 5%) are obtained from the analysis of 2-carene from fortified samples. Carvone recovery is approximately 80% with excellent precision (< 4%). The method limits of detection obtained from 2-carene and carvone fortified samples are 4.7 and 13.5 microg/g, respectively.
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Bases de dados:
MEDLINE
Assunto principal:
Thuja
/
Monoterpenos
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Idioma:
En
Revista:
J Chromatogr Sci
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Estados Unidos