safe levodopa extraction methods. Although there are many extraction methods documented in the literature, these methods use concentrated acids or alcohols [ 1 , 2 – 9 ]. The use of concentrated acids for the extraction of levodopa is effective, but
Authors:Giordano Novak Rossi, Eduardo José Crevelin, Gabriela de Oliveira Silveira, Maria Eugênia Costa Queiroz, Mauricio Yonamine, Jaime Eduardo Cecilio Hallak and Rafael Guimarães dos Santos
). In this context, DMT is extracted using home-made techniques, most notably a variation of the liquid–liquid extraction called “straight to base extraction” (STB). The extract is known to be smoked as obtained in doses of 2–60 mg, producing an
Authors:A. Oniszczuk, M. Waksmundzka-Hajnos, R. Podgórski, R. Nowak, W. Żukiewicz-Sobczak and T. Blicharski
The use of matrix solid-phase dispersion (MSPD) was tested to extract some coumarins (umbelliferone, xanthotoxin, isopimpinellin, bergapten, and pimpinellin) from Pimpinella roots. The method was compared with liquid—solid extraction methods (LSE) such as accelerated solvent extraction (ASE), ultrasound-assisted extraction (USAE) and Soxhlet extraction followed by solid-phase extraction (SPE). Several methanol concentrations and temperature conditions were examined during the liquid—solid extraction techniques. The analysis was performed by high-performance liquid chromatography with diode array detector (HPLC—DAD). MSPD extracted furanocoumarins with satisfactory recoveries ranging from 91.65% to 97.55% and relative standard deviations lower than 5,0415%. The results presented in the paper reveal that MSPD is an efficient, fast, simple and easy-to-perform method suitable for the isolation of furanocoumarins from herbs.
Authors:Nozha Mahmoud Sawan, Ahmed Ghoneima, Kelton Stewart and Sean Liu
crowding, expansion of dental arches to correct transverse discrepancies, or retraction of anterior teeth to close extraction spaces. Predisposing factors of gingival recession in orthodontic patients are still not clear. Associations between what is
Authors:Veysel Ersan, Cuneyt Kayaalp, Aydin Aktas, Ersin Gundogan, Uygar Teomete, Fatih Sumer and Servet Karagul
cosmesis [ 2 ]. A combination of these two laparoscopic techniques can potentiate the benefits of minimally invasive surgery. Here, we presented a case of laparoscopic liver resection and transvaginal extraction of the specimen.
Authors:Sue Chen, Qi An, Hong Sun and Mengqian Mao
monitor the residue of pesticides in agricultural products.
Effective sample pretreatment procedure for extraction and purification is essential prior to analysis as pesticides occur in complicated matrices. At present, several pretreatment