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    Determination of Minerals and Trace Elements in Soils and The Relation with its Concentrations in Sugar Beets
    (Asian Journal Of Chemistry, 2010) Kucukbay, F. Zehra; Kuyumcu, Ebru; Karaca, Idil; Ozdemir, Durmus
    Twelve sugar beets and corresponding soil samples from the plantation near Malatya. Turkey were analyzed for mineral and trace element contents Thirteen metals (Al, Ca. Cd, Cu. Fe. K. Mg, Mn. Na, Ni, Pb, Sc and Zn) were selected and analyzed quantitatively by FAAS/FAES and ETAAS. Principal component analysis and hierarchical cluster analysis were used to explore samples based on the element contents. The principal component analysis analysis of sugar beet samples yielded five principal components which were able to explain about 84% of the total variance in the data set. The number of principal components that are higher than one was four for the soil samples and were able to explain 83% of total variance Hierarchical cluster analysis of sugar beet samples and corresponding soil samples resulted in two main clusters based on the geographic regions of the samples In terms of the elements being analyzed, the hierarchical cluster analysis method resulted in 3-4 clusters of the elements in both sugar beet and soil samples
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    Simultaneous Determination of Water and Fat-Soluble Vitamins in Pekmez Samples by High Performance Liquid Chromatography Coupled with Diode Array Detection
    (Asian Journal Of Chemistry, 2010) Kucukbay, F. Zehra; Karaca, Idil
    In the present work, a RP-HPLC procedure has been applied for the determination of water-soluble vitamins (riboflavin. nicotinamide. pantothenic acid. pyridoxine hydrochloride. pyridoxal. folic acid, ascorbic acid) and tat-soluble vitamins (trans-retinol. alpha-tocopherol) in pekmez samples. a tradional Turkish concentrate fruit food The sample treatment proposed consists of a solid-phase extraction with Sep-Pak C(18) cartridges that allow the seperation of fat-soluble vitamins, which were retained on the sorbent, from water-soluble vitamins. After isolation of the two fractions, the water-soluble vitamins were analyzed by HPLC on an ACE 5 C(18) (250 x 4.6 mm, 5 mu m) analytical column using 0.1 mol L(-1) KH(2)PO(4) (pH 7 0)-CH(3)OH as mobile phase The chromatographic analysis of the fat-soluble vitamins was earned out after their sequential elution with CH(3)OH-CCl(4) from C(18) sorbent. on the above column. Afterwards. the fat-soluble vitamins were analyzed on an ACE 5 C(18) analytical with isocratic mobile phase consisting of CH(3)OH-CH(3)CN at a flow-rate of 2 mL min(-1). Identification of compounds was achieved by comparing their retention times and UV spectra with those of standards stored in a data bank The accuracy of the method was tested obtaining an average recovery ranging between 91 and 110%.