Journal
CHROMATOGRAPHIA
Volume 73, Issue 1-2, Pages 189-193Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10337-010-1816-2
Keywords
Gas chromatography; GC-ECD; Fresh tea leaves; Glucoside; N-Methyl-bis(trifluoroacetamide)
Funding
- Natural Science Foundation of China [30872057, 30971870]
- National Post-doctorial Science & Technology Fund committe [20080430757]
- Fund of Technical System of Chinese Tea Industry
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The possibility of using GC-ECD to determine glucosidically bound aroma precursors was investigated. Five beta-d-glucopyranosides were derivatized with N-methyl-bis(trifluoroacetamide) (MBTFA) and then determined by GC-ECD, which showed these mono-glycosides (glucosides) could be separated and identified by GC. Repeatability, sensitivity and stability were tested, relative standard deviation (RSD) was in the range of 0.55-5.9%, the limit of detection (LOD) was lower than 10(-3) mu g mL(-1), and the standard mixture was stable within 3 days (stored at 4 A degrees C, peak areas RSD < 3%). Application of the developed derivatization and determination method to the fresh tea leaves showed that the glucosides could be accurately quantified (using phenyl beta-d-glucopyranoside as internal standard). Because of its high sensitivity, the developed method was suitable for the determination of glucosides in fresh tea leaves.
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