جدول المحتويات

المجلة العراقية الوطنية لعلوم الكيمياء

ISSN: 22236686
الجامعة: جامعة بابل
الكلية: العلوم
اللغة: English

This journal is Open Access

حول المجلة

بدأت المجلة العراقية الوطنية لعلوم الكيمياء في النشر باذار 2001 وتصدر اربعة اعداد بالسنة وتعتمد اللغة الانكليزية بالنشر .

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معلومات الاتصال

na_jo_of_chemistry@yahoo.com

07804677554

جدول المحتويات السنة: 2016 المجلد: 16 العدد: 4

Article
Physical and Electrical Study of Different Carbone Nanomaterials as Modifying Material for SPCE

المؤلفون: Issam A. Latif
الصفحات: 186-203
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الخلاصة

In this work was prepared three different types of modified screen printed carbon electrode (SPCEs) with drops casted method, the used carbone nanomaterials were the MWCNT, functionalized –MWCNT (f-MWCNT) and After several experiments were made to find an appropriate ratio to make good GOT/f-MWCNT nanocomposite, and found the suspension mixture (1:1) from GOT/f-MWCNT (f-MWCNT-GOT). The electrical and physical properties were performed with cyclic voltammeter technique, and studied the maximum current response, the effective surface area, effect of the pH value and the determination of active surface area for MWCNT-SPCE , f-MWCNT-SPCE and f-MWCNT-GOT/SPCE as (0.04 cm2), (0.119 cm2) and (0.115 cm2) respectively, the surface coverage concentration ( Γ) of the material on each area was calculated and was 9.447×10-10, 9.449×10-10 and 9.3×10-10 mol cm–2 ,for MWCNT ,f-MWCNT and f-MWCNT-GOT respectively, The values of Γ for all three types of electrodes were almost the same and no noticeable difference. These electrodes were used to study the electrochemical behavior of organic compound which consisting an amide functional group, these group founded in huge spectrum of pesticide and medicine compounds etc. the penicillin antibiotic drug family has a β-lactam group (Azetidine-2-one) group. Therefore it was expected to show hydrolysis with opening of the four membered ring azetidine-2-one, in a H+/1ē process. In this work used ampicillin antibiotic AMP. The cyclic voltammetry investigation was shown the signals of anodic peak current were higher than the cathodic current signals Ipa/Ipc≠ 1, which indicated an irreversible electrode reaction, with differential pulse voltammetry was studded the limit of detection (LOD), the modification of SPCE with the f-MWCNT-GOT show the best result than the other two carbone nanomaterial MWCNT and f-MWCNT.


Article
Fabrication and Characterization of Nanostructured Calcium Phosphate and Zirconium Dioxide Composites

المؤلفون: Mohammed Yaqob Shareef محمد يعقوب شريف
الصفحات: 204-223
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الخلاصة

The aim of this study is to fabricate and characterize ceramic composites made of Ca10(PO4)6(OH)2 and ZrO2 using a simple powder pressing technique and to study the effect of addition of ZrO2 on the biaxial flexural strength (BFS) of the ceramic composites. Various compositions of hydroxyapatite (HAp)* Ca10(PO4)6(OH)2 and zirconia powder* ZrO2, ranging from 10 to 90 wt% ZrO2, were prepared using a wet mixing process. Ten compacts (13.5mm*3mm) were made for each group, pressed and fired in air at sintering (firing) temperatures from 1100 to 1450oC for up to 12 hrs. The bulk density, true porosity, linear shrinkage and BFS were evaluated. The true porosity reduced and linear shrinkage increased with increasing firing temperature and amounts of zirconia, whereas the firing time had little effect. The highest mean value achieved for the BFS was 269 MPa (*20) for a composition of 70% ZrO2 and 30% HAp fired at 1450oC for 6 hrs, however with the hydroxyapatite (HAp) decomposed to *-TCP as reported earlier [1]. We conclude that firing temperature and composition affect densification behaviour of calcium phosphate/ZrO2 ceramic composites. The BFS increases with a reduction of porosity and increases with both firing temperature and additions of ZrO2. It was noted that there is considerable scope for improvement in the BFS values by reducing the porosity of these ceramics composite. Further work is needed to examine the crystals structure and to elucidate the microstructural features of the composites.

الكلمات الدلالية


Article
Ab initio and DFT study on molecular structure, reactivity indices and nonlinear properties of 4-(4-aminophenylethynyl)picolinic acid and 4-(3-aminophenylethynyl)picolinic acid

المؤلفون: Semire Banjo سيماير بانجو
الصفحات: 224-242
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الخلاصة

Ab initio and density functional theory methods were used to study chemical shifts and global reactivity index of 4-(4-aminophenylethynyl)picolinic acid and 4-(3-aminophenylethynyl)picolinic acid. The calculated chemical shifts for the two molecules correlated to the experimental data. The regression factor (R2) for chemical shifts calculated at HF/6-31G* and B3LYP/6-31G* were 0.940 and 0.964 for 4APPA and 0.929 and 0.953 for 3APPA respectively. The absorption maxima for 4APPA were 302.81 and 341.52 nm and 292.12 and 346.95 nm for 3APPA. Global reactivity indexes (hardness, chemical potential and nucleophilicity) revealed that 4APPA should be a better nucleophile than 3AAPA. The first hyperpolarizability calculated for 4APPA and 3APPA were 8.84x10-30 and 3.41x10-30esu respectively.


Article
Nutritional Composition and Fatty Acids Profile of Senna siamea Flower and Flower Oil

المؤلفون: Temitope A. YEKEEN
الصفحات: 243-253
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الخلاصة

The proximate composition, mineral elements contents and fatty acid profile of Senna siamea flower were examined with a view to evaluating its nutraceutical potentials. The proximate analysis showed that the flower contains valuable nutrients; (g/100g) crude protein (25.49± 0.014), crude fibre (15.63±0.04), ash (7.10±0.03), crude fat (9.68±0.04), moisture content (5.54±0.03) and carbohydrate (36.56±0.01). The results of mineral analysis (mg/100g) indicated that calcium, magnesium, manganese, copper, zinc, iron, cadmium and lead are 726.00, 938.00, 64.00, 30.00, 30.00, 8.00 and 16.00 respectively. The fatty acid profile of the flower oil showed that the oil contains higher proportion of unsaturated fatty acid (51.06 %) than saturated fatty acid (39.75 %). Among the saturated fatty acids present, palmitic acid (31.92 %) was the most abundant while linoleic acid (20.86 %) and linolenic acid (16.93 %) were the most abundant unsaturated fatty acids. The results showed that the flowers of Senna siamea are good sources of essential nutrients but the detection of cadmium and lead present calls for caution and as a consequence, the flowers should be properly processed before consuming them.

الكلمات الدلالية

Senna siamea --- proximate --- minerals --- nutraceuticals.


Article
Synthesis and Characterization of some New Oxazepine Compounds Derived from D-Erythroascorbic Acid
تحضير وتشخيص بعض مركبات الاوكسازبين الجديدة المشتقة من D- حامض الارثرواسكوربيك

المؤلفون: Rasmia Mahmood Rumez رسمية محمود رميز
الصفحات: 254-267
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الخلاصة

This search include the synthesis of some new 1,3-oxazepine derivatives have been prepared, starting from reaction of L-ascorbic acid with dry acetone in presence of dry hydrogen chloride afforded the acetal (I). Treatment of the latter with p-nitrobenzoyl chloride in pyridine yielded the ester (II) which was dissolved in (65%) acetic acid in absolute ethanol yielded the glycol (III). The reaction of the glycol (III) with sodium periodate in distilled water at room temperature produced the aldehyde (IV). The compound (V) [4-(1,3-dioxoisoindolin-2-yl)benzoic acid] was synthesized by reaction p-aminobenzoic acid and phthalic anhydride in presence of (gla. CH3COOH). Reaction of compound (V) with thionyl chloride produced [4-(1,3-dioxoisoindolin-2-yl)benzoyl chloride]. Condensation of acid chloride with hydrazine hydrate afforded 4-(1,3-dioxoisoindolin-2-yl)benzohydrazide (VI). The azomethine (VII) has been synthesized from the reaction between compounds (IV) and (VI). Moreover compounds (VIII-X) were synthesized from the cyclic condensation of Schiff base (VII) with (maleic, phthalic and 3-nitrophthalic) anhydride, the structures of the newly synthesized compounds have been confirmed by physical properties and spectral measurements such as (FTIR and some of them by 1H-NMR and 13C-NMR). يتضمن هذا البحث تحضير بعض مشتقات ١،٣- اوكسازبين، حيث بدأنا بتحضير الاسيتال (I) من تفاعل L- حامض الاسكوربيك مع الاسيتون الجاف بوجود كلوريد الهيدروجين الجاف. وعند معاملة الاخير مع بارا- نايتروبنزويل كلورايد في البيريدين حصلنا على الاستر (II) الذي أذيب في (٦٥٪) من حامض الخليك في الايثانول المطلق وأعطى الكلايكول (III). تم الحصول على الالديهايد (IV) من تفاعل الكلايكول (III) مع بيرأيودات الصوديوم في الماء المقطر. حضر المركب ٤-(١،٣- ثنائي اوكسو ازواندولين-٢- يل) حامض البنزويك (V) من تفاعل انهيدريد الفثاليك مع بارا- امينو حامض البنزويك بوجود حامض الخليك الثلجي. ان تفاعل المركب (V) مع كلوريد الثايونيل ينتج ٤-(١،٣- ثنائي اوكسو ازواندولين-٢- يل) كلوريد البنزويل الذي يتكاثف مع الهيدرازين المائي ليعطي ٤-(١،٣- ثنائي اوكسو ازواندولين-٢- يل) بنزوهيدرازيد (VI). حضر مركب الازوميثين (VII) من التفاعل بين مركب (IV) و (VI). اضافة الى ذلك حضرت المركبات (X-VIII) من التكاثف الحلقي لقاعدة شف (VII) مع انهيدريد الماليك، الفثاليك و 3- نايتروفثاليك وتم اثبات تراكيب المركبات الجديدة بواسطة قياسات الخواص الفيزيائية والطيفية مثل ( الاشعة تحت الحمراء وتم قياس لبعضها بروتون وكاربون الرنين النووي المغناطيسي).

جدول المحتويات السنة: 2016 المجلد: 16 العدد: 4