Novel one-step headspace dynamic in-syringe liquid phase derivatization–extraction technique for the determination of aqueous aliphatic amines by liquid chromatography with fluorescence detection

Ultrasound-Assisted Extraction of Taxifolin, Diosmin, and Quercetin from Abies nephrolepis (Trautv.) Maxim: Kinetic and Thermodynamic Characteristics

“…The production yields of the target analytes differ under the various ultrasound frequencies, which may be because the formation of cavitation bubbles is difficult within the given time at higher ultrasound frequencies [42]. Another reason may be that the frequency of 45 kHz more efficiently avoided the production of radicals within the cavitation bubbles from the sonication procedure [43]. The yield of target analytes differs in a variety of tissues, which may be explained by the variation in tissue density between leaves and bark.…”

Chemical Derivatization Processes Applied to Amine Determination in Samples of Different Matrix Composition

“…However, they found some disadvantages with this method such as instability of the microdrop, operational difficulties, and air bubble formation during extraction. To overcome these drawbacks, Muniraja et al 111 developed an automated one-step in-syringe simultaneous derivatizationextraction method for the analysis of primary and secondary aliphatic amines in aqueous samples. The present method provides a simple, selective, automated, low cost, and eco-friendly procedure to determine aliphatic amines in aqueous samples.…”

“…One of the commonly used reactants from this group of compounds is 9-fluorenylmethyl chloroformate (FMOC), which in a slightly alkaline environment reacts very quickly (2 min), resulting in stable derivatives showing fluorescent abilities. 107,167,168 The reactant can also be used for the final assay with a UV−vis detector. Another derivatizing reagent appropriate for amine compounds is (+)-fluorenylethylchloroformate (FLEC).…”

“…In the last few years, many different derivatization methods of amine have been developed for SDME [109][110][111] . Previously, derivatization followed by SDME was the most commonly used for the analysis of amine compounds 130 .…”

“…However, they found some disadvantages with this method such as instability of the microdrop, operational difficulties and air bubble formation during extraction. To overcome these drawbacks, Muniraja et al 111 developed an automated one-step in-syringe simultaneous derivatization-extraction …”