Rapid analysis of aldehydes by simultaneous microextraction and derivatization followed by GC-MS.

Ultrasound-assisted dispersive liquid-liquid microextraction (UDLLME) and simultaneous derivatization followed by GC-MS was developed for the analysis of four aldehydes including acetaldehyde (ACE), propionaldehyde (PRO), butyraldehyde (BUT) and valeraldehyde (VAL) in water samples. In the proposed method, the aldehydes were derivatized with O-2,3,4,5,6-(pentafluorobenzyl)hydroxylamine (PFBHA) and extracted by UDLLME in aqueous solution simultaneously; finally, the derivatives were analyzed by GC-MS. The experimental parameters were investigated and the method validations were studied.

Rapid analysis of the essential oil components of dried (L.) by magnetic nanoparticle-assisted microwave distillation and simultaneous headspace solid-phase microextraction followed by gas chromatography-mass spectrometry.

In this work, two solvent-free sample preparation techniques of microwave distillation (MD) and headspace (HS) solid-phase microextraction (SPME) were combined, and developed for the determination of essential oil compounds in dry traditional Chinese medicine (TCM). Amine-functionalized magnetite nanoparticles (AMNs) were added and mixed with the dried Perilla frutescens (L.) sample, which was used as a microwave absorption solid medium for dry distillation of the TCM.

(E)-Ethyl 3-(4-fluoro-anilino)-2-(4-methoxy-phen-yl)acrylate.

In the title compound, C(18)H(18)FNO(3), the dihedral angles between the two benzene rings and the plane through the acrylate group and the fluoro-phenyl ring are 61.58 (8) and 13.33 (9)°, respectively.