Ultrasonic-Assisted Solid-Phase Extraction Pre-concentration and Determination of Nicotinamide and Nicotinic Acid by High-Performance Liquid Chromatography Using Anthracite

A new approach to the determination of folic acid at trace levels: using a Fe(iii)-folic acid complex to amplify analytical signal

“…In the case of complex samples, such as multivitamin preparations, foods, plant extracts, serum, or urine, determining trace organic molecules such as folic acid requires a lot of tedious work that includes pretreatment steps, and the methods may still result in interference or a matrix effect. 25 A method published by Mirmoghtadaie et al was used aer a few modications in the preparation of food samples and certied reference materials (CRM) prior to analysis. 26 According to this method, a vitamin tablet including folic acid was ground and dissolved in 0.10 mol L À1 NaOH in a 100 mL standard ask.…”

Potentiometric Sensors Based on MF-4SC Membranes and Carbon Nanotubes for the Determination of Nicotinic Acid in Aqueous Solutions and Pharmaceuticals

“…The necessity to analyze objects with a complex composition gives an impetus to the development of new methods for the determination of nicotinic acid [1][2][3][4][5][6][7][8][9][10][11]. Several reports focus on the use of mass spectrometry [1,2], high-performance liquid chromatography combined with mass spectrometry [3,4], voltammetry [4][5][6], and solid phase extraction [7] for this purpose. There are reports on methods for determining trace amounts of nicotinic acid in physiological fluids that are based on acid sorption on modified carbon dots and subsequent fluorometric detection [8] and methods using voltammetric [9] and amperometric [10] sensors.…”