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Synthesis of toluene-4-sulfonic acid 2-(2-thiophen-2-yl-phenanthro[9,10-d]imidazol-1-yl)-ethyl ester and its application for sensitive determination of free fatty acids in ginkgo nut and ginkgo leaf by high performance liquid chromatography with fluorescence detection
Ist Teil von
RSC advances, 2018-01, Vol.8 (33), p.18549-18559
Ort / Verlag
England: Royal Society of Chemistry
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Electronic Journals Library
Beschreibungen/Notizen
A novel fluorescent labeling reagent toluene-4-sulfonic acid 2-(2-thiophen-2-yl-phenanthro[9,10-
d
]imidazol-1-yl)-ethyl ester has been designed and synthesized. It was used to label twenty-six fatty acids (C5-C30) successfully in the presence of K
2
CO
3
catalyst in
N
,
N
-dimethylformamide solvent. The reaction conditions were optimized by employing a three-factor, three-level Box-Behnken design. Derivatives were sufficiently stable to be efficiently analyzed by high-performance liquid chromatography with fluorescence detection. All fatty acid derivatives were separated on a hypersil BDS-C8 column in conjunction with a gradient elution with a good baseline resolution. Good linear correlations were observed for all fatty acids with correlation coefficients > 0.993. The established method exhibited high sensitivity and excellent repeatability. The limit of detection (at a signal-to-noise ratio of 3 : 1) was 8.8-45.5 fmol. The method was used to quantify free fatty acids in ginkgo nut and ginkgo leaf samples with satisfactory results.
A highly sensitive HPLC-FL method to determine fatty acids was developed utilizing TSTPE as a novel fluorescent labeling reagent.