Quantitative chemical profiling of cellulose acetate excipient via 13C NMR spectroscopy in controlled release formulations

Simultaneous derivatization and extraction of amphetamine and methamphetamine using dispersive liquid–liquid microextraction prior to their analysis using GC-FID in creatine supplements

“…Solvent extraction-based methods are more popular than solid-based extraction procedures because of their versatility. [18][19][20][21][22][23] Up to now, different approaches, including pipette tip solid-phase extraction (SPE), 24 disc SPE, 25 micropulverized and derivatization by packed SPE, 26 dispersive liquid-liquid microextraction, 27 molecularly imprinted polymer-based SPE, 28 extraction by modied cellulose lter paper, 29 enzymatic cell dispersion, 30 hollow ber liquid phase microextraction, 31 electro-enhanced single drop microextraction, 32 salting out assisted liquid-liquid extraction, 33 and electro-enhanced solid phase microextraction 34 have been developed based on solid or liquid phase extraction/ microextraction procedures.…”