CJ-VOLUME 05 ISSUE 04 JULY 2015


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Volume 5 Issue 3, May 2015

Chemistry Journal

ISSN

2049-954X

Publication Frequency

6 Issues per year

Pages

54-79

Publication History


Original Articles

Liquid-Liquid Extraction-Spectrophotometric Determination of Vanadium with 2-Hydroxy-5-Bromothiophenol and Aromatic Amines

Ali Z. Zalov and Naila A. Verdizade

Pages 54-62

Isolation and Characterization of Genomic DNA Clones Encoding Sta-rch Branching Enzyme I (SBEI) and Starch Branching Enzyme II (SBEII) from Marama Bean; Tylosema esculentum (Burchell A. Schreiber)

Emmanuel Nepolo, Larry Hale and Percy Chimwamurombe

Pages 63-70

Oxygen Enrichment of Air on Zeolites Modified By Li+ and Zn2+

Hüseyin Karaca and Murat Teker

Pages 71-75

Extraction and Atomic Absorption Determination of Zirconium (IV) with Azo-Derivative Para-Tret-Butylphenol

A.M. Pashajanov

Pages 76-79


Title

Liquid-Liquid Extraction-Spectrophotometric Determinati-on of Vanadium with 2-Hydroxy-5-Bromothiophenol and Aromatic Amines

Abstract

Mixed-ligand complexes of Vanadium (IV, V) with 2-hydroxy-5-bro-mothiophenol (HBTP) and hydrophobic amines have been stud-ied by spectrophotometry. Extraction of mixed ligand complexes is maximal at pH 3.4-4.6. The optimal conditions for the formation and extraction of mixed-ligand compounds have been found and the ratios of components the complexes have been determined. The Beer’s law was applicable in the range of 1.0-18 μg/ml. The method is free from common interferences. A procedure has been developed for extraction –spectrophotometric determination vanadium in soils and in oil and oil-products.

Keywords

Extraction-Spectrophotometric Method, Vanadium, 2-hydroxy-5 bromothiophenol (HBTP), Hydrophobic Amines (Am), Mixed-Ligand Complexes

 

Title

Isolation and Characterization of Genomic DNA Clones En-coding Starch Branching Enzyme I (SBEI) and Starch Bran-ching Enzyme II (SBEII) from Marama Bean; Tylosema esc-ulentum (Burchell A. Schreiber)

Abstract

Marama bean is a highly nutritious plant and is currently regarded as a prospective crop for the future in arid zone agri-ecologies of the world. Starch is a major storage component in higher plants and in marama bean, it is mostly found stored in the tuber. Starch is used in both food and non-food industries and starch biosynthesis in plants involves groups of committed enzymes. In the present study genomic DNA sequences of an SBE-I and SBE-II genes were isolated and characterized from marama bean using a PCR (Polymerase Chain Reaction) based approach. The isolated PCR sequence for SBE-I encompassed 291 bp encoding a SBEI precursor with 96 amino acid residues, while that one of SBE-II encompassed 414 bp encoding a SBE-II precursor with 137 amino acid residues. Homolo-gy search analysis for SBE-I sequence showed 91% coverage with Cicer arietinum, while SBE-II sequence showed 93% identity with Medicago truncatula SBE-II. A phylogenetic tree analysis indicated that marama SBE-I and SBE-II are more closely related to C. arietinum SBE-I and M. truncatula SBE-II. This is the first report on identification and characterization of SBE genes from marama be-an making it possible to explore the roles of this enzyme for amylopectin development in marama bean.

Keywords

Marama Bean, Starch, Starch Branching Enzyme, Cloning, PCR


Title

Oxygen Enrichment of Air on Zeolites Modified By Li+ and Zn2+

Abstract

Turkey is one of the world's leading manufacturers of natural zeol-ite clinoptilolite. The effectively usage of reserves of natural zeolites in the oxygen production process can provide better designing for systems requiring oxygen in industry. The main goal of this paper was to determine the adsorption and oxygen production capabilities of natural zeolites modified by different metal ions. In this study, separation of nitrogen and oxygen of air by adsorption on the clino-ptilolite which is natural zeolite and modified with zinc and lithium salts was investigated. Modified natural zeolites were activated at 400 oC thermally. Variation of nitrogen adsorption and oxygen enr-ichment was investigated by changing pressure, feeding rate and period of gas, cation type on modification.

Keywords

Adsorption, Oxygen Enrichment, Zeolite, Zeolite Modification, Clinoptilolite


Title

Extraction and Atomic Absorption Determination of Zirco-nium (IV) with Azo-Derivative Para-Tret-Butylphenol

Abstract

The complexation of zirconium with 2-hydroxi-5-T-butylphenol-4-nitroazobenzene (HR) was studied by atomic-absorption spectrome-try and spectrophotometry. Optimum conditions for the formation and extraction of the complex were found, the ratio of components and spectrophotometric parameters of the complex were determin-ed. A method was developed for extraction and atomic-absorption determination of nickel.  By the molar ratio and equilibrium shift method we established that under optimum extraction conditions the Zr(IV) and HR complex with ratio 1:2 is formed. Molar absorpt-ion coefficient of Zr(IV) was calculated by the Tolmachev method and equal to (13±0.1)104. The calibration graph was linear at zirco-nium concentrations 1-10 mkg/ml.

Keywords

Zirconium, Complexation, Extraction, 2-Hydroxi-5-T-Butylphenol-4-Nitroazobenze-ne, Atomic-Absorption Method