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Study of the Essential Oil Composition of Cumin Seeds by an Amino Ethyl-Functionalized Nanoporous SPME Fiber

Chromatographia (Impact Factor: 1.44). 01/2009; 70(7):1147-1151. DOI: 10.1365/s10337-009-1269-7

ABSTRACT An ultrasound assisted SPME method with a new nanoporous SBA-15 fiber functionalized with 3-[bis(2-hydroxyethyl)amino]propyl-triethoxysilane
was successfully applied to the study of the essential oil composition of cumin (Cuminum cyminum L.) seeds. The sample was irradiated by ultrasound radiation and its volatile components were collected by the fiber from
the sample headspace and directly injected into a GC-MS injection port for analysis. A simplex method was used for optimization
of four different parameters affecting the efficiency of the extraction. Under the optimized conditions (i.e. sample weight,
0.6g; temperature, 70°C; sonication time, 12min and extraction time, 28min), the number of components identified by the
proposed method and their amounts were identical to those of a hydrodistillation technique. The extraction efficiency of the
SBA-15 fiber was superior to a PDMS commercial fiber. The major components identified were p-menta-1,3-dien-7-al, cuminaldehyde, γ-terpinene and p-cymene, respectively. The proposed method was applied to a comparative study of the essential oil composition of cumin in
three different climate conditions of the Lorestan province in Iran. The results indicated that the essential oils in the
temperate and tropical locations were 94.0 and 85.6% of the cold region, respectively.

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    ABSTRACT: A rapid method for the extraction and monitoring of nanogram level of Pb2+ and Cu2+ ions using uniform silanized mesopor (SBA-15) functionalized with aminobenzenesulfonamide groups and flame atomic absorption spectrometry (FAAS) is presented. Aminobenzenesulfonamide functionalized SBA-15 was synthesized according to procedure in the literature and the presence of organic groups in the silica framework was demonstrated by FT-IR spectra. The functionalized product showed the BET surface area 110 m2/g and pore diameter 5.1 nm, based on adsorption-desorption of N2 at 77 K. The effect of several variables such as (amount of adsorbent, stirring time, pH and presence of other ions in the medium) has been studied. Lead and copper were completely extracted at pH greater than 3 after stirring for 10 min. The maximum capacity of the adsorbent was found to be 191.3 +/- 1.4 and 155.0 +/- 1.0 microg of lead and copper ions/mg functionalized SBA-15, respectively. The preconcentration factor of the method was found to be 200. The detection limit of the technique was 3.4 and 0.4 ng/mL for Pb2+ and Cu2+, respectively. The applications of this methodology for real samples were examined by various water type, black tea and pepper samples.
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