Effervescence and graphitized multi-walled carbon nanotubes assisted microextraction for natural antioxidants by ultra high performance liquid chromatography with electrochemical detection and quadrupole time-of-flight tandem mass spectrometry

Tablet‐effervescence‐assisted dissolved carbon flotation for the extraction of four triazole fungicides in water by gas chromatography with mass spectrometry

“…It is a simple reaction to produce carbon dioxide which can help the dispersion of extraction solvents or adsorbents without additional energy. Similar works which tablet effervescence are served as dispersive force have been reported in recent years, applying to pesticide detection in various matrices, consisting juice, water and human urine samples . According to the advantage, it has tremendous potential to apply to on‐site analysis.…”

“…The tablet effervescence occurred from down to top of the vial and the carbon dioxide bubbles were extremely tiny and homogeneous, resulting in the great dispersion of extraction solvent happening in solution . But differently from other effervescent method, the whole process caused a negligible variation in the pH value (ΔpH = 0.25) and could apply to on‐site extraction.…”

“…In principle, adding more effervescent agent into the aqueous sample can produce more carbon dioxide to assist the dispersion of extraction solvent and enhance the mass transfer from solution to extractant. Whereas, the increase of the effervescent tablets amount causes the result that the ionic strength and viscosity increases, followed by the decrease of extraction efficiency because of the viscous resistance effect . In this research, the effervescent agent amount was investigated in the range of 1–4 tablets (to produce the amount of carbon dioxide in the range of 0.002–0.008 mol).…”

Effervescence-Assisted Microextraction—One Decade of Developments

“…The proposed alternative combined with Liquid Chromatography-Diode Array Detector (LC-DAD) was comparable with other alternatives in terms of sensitivity and precision but reducing the processing time to minutes. Later, Wang and co-workers fabricated effervescent tablets (102 mm ID) with MWCNTs as sorbent for the extraction of natural antioxidants in hawthorn samples (medicinal and food plants) before LC-ECD (Electron Capture Detector ) analysis [18]. Authors selected 300 mg of effervescent precursors (NaH 2 PO 4 and Na 2 CO 3 ) as the optimum value, since higher amounts could have a negative impact on the extraction efficiency by increasing the ionic strength and viscosity of the sample and subsequently reducing the mass transfer process.…”

Enhanced extraction of organophosphorus pesticides from fruit juices using magnetic effervescent tablets composed of the NiFe2O4@SiO2@PANI-IL nanocomposites

“…Nowadays, effervescent reaction-enhanced microextraction is based on a simple reaction that generates CO 2 bubbles, which accelerates the dispersion of MNPs in solution. 24,25 The process of magnetic effervescent tablet-assisted dispersive extraction can eliminate the use of dispersive solvents in microextraction, realize rapid magnetic separation, avoid centrifugation/stirring steps and save processing time.…”