Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Optimization of Important Factors on the Adsorption of Methyl Violet by Modified Palm Fiber Using Experimental Design Method
237
254
EN
Maryam
Abrishamkar
Department of Chemistry, Science and research Branch, Islamic Azad University, Ahvaz, Iran
abrishamkar.maryam@yahoo.com
Rashin
Andayesh
Department of Chemistry, Science and research Branch, Islamic Azad University, Ahvaz, Iran
rashinandayesh@gmail.com
Hossein
Hodaee
Department of Chemistry, Science and research Branch, Islamic Azad University, Ahvaz, Iran
shimidan_63@yahoo.com
10.33945/SAMI/AJCA.2020.3.1
Via Box-Behnken method, we evaluated the influence of various factors on absorption, including the amount of absorbent, the speed of stirring the solution and absorbent, pH of solution, time of contact, and various concentrations of violet methyl colour, to obtain optimum conditions. The maximum extent of violet methyl removal was found at 100 mg/L concentration, pH = 4.6, contact time = 50 minutes, 120 rotation speed, and absorbent dose = 1.488 g/L (0.0744 gram in 50 millilitre). In order to determine the reaction mechanism, two kinetic models were used, namely pseudo-first-order and pseudo-second kinetics models. The adsorption kinetics followed pseudo-second order model, and the mechanism of chemical reaction was the rate-limiting step. Furthermore, the Langmuir and Freundlich Isotherms were considered for absorbing the violet methyl on the palm fiber absorbent. The adsorption isotherms showed a balanced relationship between the materials adsorbed on the adsorbent (qe) and a balanced concentration in the solution (Ce) at a constant temperature. This method was used to remove the violet methyl colour from real samples such as industrial sewage, tap and river water.
Methyl violet,Palm fiber,Box-Behnken,optimization,Adsorption
http://www.ajchem-a.com/article_92584.html
http://www.ajchem-a.com/article_92584_b09970a0c1daeeee5ec3a51fa6127479.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Proton Transfer Reaction in Water: Hydronium Ion Formation
255
258
EN
In Sang
Lee
Research Division, Divine Lab Limited, Seoul, South Korea
Sitansu
Sekhar Nanda
Department of Chemistry, Myongji University, Yongin, South Korea
nanda_sitansu@rediffmail.com
10.33945/SAMI/AJCA.2020.3.2
The current ongoing scientific debate deals with accumulation of hydronium ions (H<sub>3</sub>O<sup>+</sup>) on water surface. Elevated interfacial concentration measured by using Raman spectroscopy. A strong surface affinity of H<sub>3</sub>O<sup>+</sup> indicated by Raman spectroscopy under similar conditions. Ion adsorption phenomena, H<sub>3</sub>O<sup>+</sup> formation and its structural activity emphasized in our study. Asymmetric water ion adsorption clearly observed in our research.
Raman spectroscopy,Hydronium,Water,Infrared spectroscopy
http://www.ajchem-a.com/article_92784.html
http://www.ajchem-a.com/article_92784_91e8521cb7e4119a80c57689e274d8ca.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Propylene Oxide−Ethylene Oxide Block Polymer as a Surfactant for Cloud Point Extraction of Some Metal Ions
259
264
EN
Abdelsalam
Asweisi
Chemistry Department, Faculty of science, Benghazi University, Benghazi, Libya
Rihab
Hussein
Chemistry Department, Faculty of science, Benghazi University, Benghazi, Libya
Nabil
Bader
Chemistry Department, Faculty of science, Benghazi University, Benghazi, Libya
nabil.bader@uob.edu.ly
Rajab
Elkailany
Chemistry Department, Faculty of science, Benghazi University, Benghazi, Libya
10.33945/SAMI/AJCA.2020.3.3
Propylene oxide-ethylene oxide block polymer (PO-EO) is a surfactant with low cloud point. It has been used for separation of Cu<sup>2+</sup>, Fe<sup>3+</sup>, Mn<sup>2+</sup>, Cd<sup>2+</sup> and Cr<sup>3+</sup> ions in aqueous media. The effect of different factors on recovery percent, like pH, temperature, amount of chelating agent, and amount of surfactant have been studied. A very good separation of metal ions could be achieved at different pH values with good effeciency of separation under the optimum conditions. The analyses of metal ions were carried out using flame atomic absorption spectrometer with duterium lamp background correction and calibration curve method curve method.
Cloud point extraction,Propylene oxide-Ethylene oxide block polymer,APDC
http://www.ajchem-a.com/article_92842.html
http://www.ajchem-a.com/article_92842_370812dada29a3503932300aa66af665.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Structural Properties and Cation Distribution in Co2+ and Ho3+ Ions Induced Nanocrystalline ZnFe2O4
265
273
EN
Jalindar Gahininath
Lohkare
Department of Chemistry, Faculty of Science and Technology, S M D M College, Kalamb, Dist. Osmanabad, Maharashtra, India
jglohkare@gmail.com
Shujat Hussain
Quadri
Department of Chemistry, Maulana Azad College, Aurangabad, Dr. Babasaheb Ambedkar Marathwada University, Maharashtra 431004, India
zahed1447@yahoo.com
Laxamn Appa
Dhale
Department of Materials Chemistry, Shri Krishna College, Gunjoti, Dr. Babasaheb Ambedkar Marathwada University, Maharashtra 431004, India
laxman.dahle@gmail.com
Ketankumar Ambadasrao
Ganure
0000-0002-1119-7641
Department of P. G. Studies and Research in Nanotechnology, Faculty of Science and Technology, Punyashlok Ahilyadevi Holkar Solapur University Solapur-413006, Maharashtra, India
ketan.ganure@rediffmail.com
10.33945/SAMI/AJCA.2020.3.4
Nanocrystalline Co<sub>y</sub>Zn<sub>1-y</sub>Ho<sub>z</sub>Fe<sub>2-z</sub>O<sub>4</sub> (where y = 0.0, 0.25, 0.5, 0.75, 1.00 and z=0.0, 0.03, 0.06, 0.08, 0.1) ferrites were prepared by sol-gel auto combustion method at pH of 8. Samples were obtained by annealing at relatively low temperature 600 °C for 4 h and characterized by thermo gravimetric/differential thermal analysis (TG/DTA) all the samples were annealed at 600 °C for 4 h. The prepared samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR) spectroscopy. Particle size measured from XRD and TEM are in good agreement with each other. The TEM study reveals the fine particle nature of the ferrites with little agglomerations. The cation distribution suggests that Zn<sup>2+ </sup>ion mainly on tetrahedral-A sites, Ho<sup>3+ </sup>ions shows strong preference towards octahedral-B site, Co<sup>2+ </sup>and Fe<sup>3+</sup> ions are randomly distributed at the tetrahedral-A and octahedral-B site. FT-IR study confirmed two main absorption bonds in the frequency range 400-600 cm<sup>-1</sup>, assigned due to the tetrahedral-A and octahedral-B stretching vibrations.
Nanocrystalline ferrite,sol-gel auto combustion,X-ray diffraction cation distribution
http://www.ajchem-a.com/article_93073.html
http://www.ajchem-a.com/article_93073_967063fd47537b513ff6c3a9ba0f08ce.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Synthesis, Characterization and Biological Activity of Schiff Bases Based on Chitosan and Acetophenone Derivatives
274
282
EN
Olivia Hanaa
Raouf
Department of Chemistry, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
olivia.hanna.dv@hotmail.com
Samy
Selim
Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Jouf University, Sakaka P.O. 2014, Saudi Arabia
sadomm2003@yahoo.com
Hussein
Mohamed
Research institute of Medicinal and Aromatic plants (RIMAP), Beni-Suef University, Beni-Suef, Egypt
h_gendy_2010@yahoo.com
Omayma Fawazy
Abdel-Gawad
Department of Chemistry, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
omayma2013@hotmail.com
Ali Mahmoud
Elzanaty
Department of Chemistry, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
chemisthussein1980@gmail.com
Sayed Abdel-Kader
Ahmed
Department of Chemistry, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
skader_70@yahoo.com
10.33945/SAMI/AJCA.2020.3.5
Modification of chitosan any Schiff base reaction with acetophenone derivatives was done. Fourier transformer infrared analysis (FT-IR), scanning electron microscope (SEM), and X-ray diffraction (XRD) were used as the appropriate characterize the Schiff base derivatives. Thermal behavior of the prepared materials was also studied. Various biological activities were examined for the prepared materials antimicrobial activity including antibacterial (studied against Streptococcus sp. Bacillus subtilis and Sarcina lutea as an example for gram-positive bacteria and Pseudomonas aeruginosa and Escherichia coli as an example for Gram-negative bacteria), anti-fungal (against Candida albicans) and anti-protozoal (against Trypanosoma cruzi and Leishmania donovaniwas). Antioxidant activity of chitosan and its Schiff base derivatives was detected using the FRAP and DPPH techniques. Colon carcinoma (Colo 205), hepatocellular carcinoma (Hep G2), urinary bladder carcinoma (T24P) and embryonic kidney adenocarcinoma (293) used to examine the anticancer activity of chitosan and its modified derivatives. The new chitosan Schiff base derivatives showed superior anti-bacterial, antifungal, anti-protozoal and antioxidant activity than parent chitosan. But in case of anticancer test of HebG2 and T24P chitosan was more effective than the modified derivatives.
Chitosan,Schiff base,Antimicrobial,Antioxidant,Anti-protozoal
http://www.ajchem-a.com/article_93078.html
http://www.ajchem-a.com/article_93078_1486fdc10ce9a17e3910d6a03fd145de.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
A Highly Selective Complexometric Determination of Mercury(II) using L-Tyrosine as a Masking agent
283
288
EN
Ashwini
Prasad
0000-0001-7191-9784
Department of Chemistry, St. Aloysius College, Mangalore-575003, Karnataka, India
ashwinichem27@gmail.com
Gopalakrishna
Bhat Nellikaya
Department of Chemistry, Srinivas Institute of Technology (Visvesvaraya Technological University), Valachil, Mangalore-574143, Karnataka, India
shreedakumar1@gmail.com
Ronald Aquin
Nazareth
Department of Chemistry, St. Aloysius College, Mangalore-575003, Karnataka, India
ronald.nazareth@gmail.com
10.33945/SAMI/AJCA.2020.3.6
Determination of mercury in the existence of various other metal ions, a transparent speedy and accurate complexometric method is described, depending on the selective masking ability of <em>L</em>-Tyrosine towards Hg (II). Along with other associated metal ions, Hg (II) present in a given sample solution is first complexed with an surplus of EDTA and the leftover EDTA is titrated with Zinc sulfate solution in the presence of xylenol orange as an indicator at pH 5.0-6.0.A known excess of 0.02M <em>L</em>-Tyrosine solution is then added to discharge the EDTA from Hg (II)-EDTA complex and then it is mixed well. The displaced EDTA is again titrated with a Zinc sulfate solution. The method goes well in the range 4-80 mg of mercury (II) with the relative error ±0.4 and standard deviation ≤0.05 mg. The issue of the existence of various metal ions on the exactitude of the results has been studied. And the method can be applied for the determination of Mercury in alloys, in its synthetic mixtures of ions and its complexes.
Mercury determination,EDTA titration,complexometry,masking,L-Tyrosine
http://www.ajchem-a.com/article_93213.html
http://www.ajchem-a.com/article_93213_e06e3cfec964855b110ea6e29f864f54.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Effective Removal of Cd(II) and Pb(II) from Aqueous Solution by Synthesized Palladium Nanoparticles Using Spent PdCl2 Catalyst: Experimental Design and Optimization
289
300
EN
Ozra
Alimohammadi
Department of Chemistry, Islamic Azad University, Saveh Branch, Saveh, Iran
lalimohammadi60@gmail.com
10.33945/SAMI/AJCA.2020.3.7
Environmental considerations have motivated the present study to develop and to investigate Cd(II) and Pb(II) removal process from aqueous solutions. This was carried out through the application of ultrasound onto sodium dodecyl sulfate coated palladium nanoparticles (SDSPdNPs). The recovered palladium chloride of petroleum’s spent catalyst used as a precursor for the nanoparticle synthesis. The size, morphology and the structure of the synthesized adsorbent has been fully characterized using transmission electronic microscope (TEM), scanning electron microscope (SEM), and X-ray diffractometer (XRD) spectroscopy measurements. The mean diameter of the SDSPdNPs as typically 23.4 nm for a generally homogeneous size regardless of agglomeration is reported. Statistically designed experiments with the support of central composite design (CCP) and response surface methodology (RSM) were applied to evaluate the main physiochemical parameters that would affect the interactions among the variables with the aim to define optimization criteria for the adsorption efficiency with respect to both of the metal ions. The optimized condition is reported as follows: pH: 4.2; contact time: 92 min; adsorbent dosage: 65 mg. Further to the above findings, the experimental equilibrium data efficiency fitted the Langmuir model with a high adsorption capacity of 323.14 and 207.81 mg/g<sup>-1</sup> in the case of Pb(II) and Cd(II), respectively.
Palladium nanoparticles,Adsorption,Heavy metal ions removal,Recycling,Experimental Design
http://www.ajchem-a.com/article_93221.html
http://www.ajchem-a.com/article_93221_06510f102dc1e6f892ff736546f11229.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Physico-Chemical Properties of Ordinary Portland Cement Pastes after Partial Substitution of Gypsum with Thermally Treatment Phosphogypsum
301
317
EN
Mahmoud Ahmed
Taher
11133444876585
Department of Chemistry,Faculty of Science, Al-Azhar University, Assiut, Egypt
mahmoudtaher51@hotmail.com
Adel Mohamed
Amine
Housing and Building National Research Center, Cairo, Egypt
adelamin45@yahoo.com
Bassam Khalaf
Damarany
11133444876585
Manaseer cement and mining company, Jordan, Jordan
ch_bassam66@yahoo.com
10.33945/SAMI/AJCA.2020.3.8
The present study conducted to investigate the potential use of PG in cement industry. This was accomplished by preparing mortar mixes contain Portland cement clinker (PPC) with thermally treated PG at different temperatures (200, 400, 600, 800 and 1000 °C) instead of raw gypsum (RG) at different proportions. The characteristics of prepared mortars were investigated after curing in water for different periods (3, 7, 28 and 90 days) by determination of setting time, compressive strength, bulk density, and total porosity. The hydration kinetics was evaluated by determination of free lime and chemically combined water contents. FTIR spectroscopic analysis was used to investigate the change in structure of some mortars after curing. The change in morphology and microstructure of hardened pastes was investigated using scanning electron microscopy (SEM). The results approved the possibility for the utilization of treated PG at 800 and 1000 °C instead of raw gypsum in cement industry.
Phosphogypsum,Clinker,Ordinary Portland Cement
http://www.ajchem-a.com/article_93290.html
http://www.ajchem-a.com/article_93290_7a5faea87e4dfefe435e97daac55b93e.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Comparative Studies of Nutritional, Microbial and Organoleptic Properties of Different Indigenous Dried Fish from Local Market in Bangladesh
318
327
EN
Md Masud
Rana
Department of Fishing and Post Harvest Technology, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh
ranadof.bd@gmail.com
Subhash
Chandra
Chakraborty
Department of Fisheries Technology, Bangladesh Agricultural University, Mymensingh, Bangladesh
subhash55chakraborty@yahoo.co.uk
Abu
Saeid
0000-0003-3905-0833
Department of Food Engineering, NPI University of Bangladesh, Manikganj
saeidfpp.hstu@gmail.com
10.33945/SAMI/AJCA.2020.3.9
In this study, ten indigenous dried market fishes were selected to analyze the proximate composition, microbial analysis, and organoleptic properties. Proximate compositions were found to be varied among the species. Moisture content ranged from 15.66% to 35.50%, protein content ranged from 42.06% to 65.78%, lipid content varied from 4.20% to 13.03% and ash content ranged of 5.28% to 18.60%. The results of TVB-N in different fish species ranged from 11.15 mg/100 g to 18.33 mg/100 g with highest in Puti (<em>Puntius sophore</em>) whereas lowest in Chanda (<em>Chanda ranga</em>) species. The bacterial load of dried fish species ranged from 3.13×10<sup>7</sup> to 3.67×10<sup>8</sup> (CFU/gm) with highest in Katchki (<em>Corica soborna</em>) and lowest in Puti (<em>Puntius sophore</em>). The sensory evaluation results revealed that Chapila (<em>Gudusia chapra</em>) is superior among the other dried fish species with color, flavor and appearance aspect. Overall, Chanda (<em>Chanda ranga</em>) was the better quality regarding all parameter among other dried fish species except protein content highest in Churi (<em>Trichiurus lepturus</em>) which was significantly different (P≤0.05) from Chanda (<em>Chanda ranga</em>) species.
Dried fish,proximate composition,total plate count,TVB-N,Sensory Evaluation
http://www.ajchem-a.com/article_93304.html
http://www.ajchem-a.com/article_93304_faacb70543a4c6037115c2b48700a400.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Development and Validation of Vierordt’s and Absorbance Ratio Spectrophotometric Methods for Simultaneous Estimation of Aspirin and Omeprazole in Their Binary Mixture
328
335
EN
Megha
Sharma
Department of Pharmacy, Gyan Ganga Institute of Technology and Sciences, Jabalpur, (MP) 482003, India
Anupam
Jaiswal
Shri Ram Institute of Technology, Pharmacy, Near ITI Madhotal, Jabalpur, (MP) 482002, India
Shalini
Shivhare
Shri Ram Institute of Technology, Pharmacy, Near ITI Madhotal, Jabalpur, (MP) 482002, India
Aditi
Bapat
Shri Ram Institute of Technology, Pharmacy, Near ITI Madhotal, Jabalpur, (MP) 482002, India
Deepak Kumar
Jain
Medicinal Chemistry Research Laboratory, SLT Institute of Pharmaceutical Sciences, Guru Ghasidas University, Bilaspur, (CG) 495009, India
jaindeepak2022@gmail.com
10.33945/SAMI/AJCA.2020.3.10
The present study deals with the development and validation of two simple, accurate and precise spectrophotometricmethods for estimation of Aspirin (AS) and Omeprazole (OMP) in their binary mixture. The first method was developed using Vierordt’s simultaneous equation method. It involves absorbance measurement at 257 and 300 nm (<em>λ</em><sub>max</sub> of AS and OMP) in methanol. Second method involves the formation of <em>Q</em>-absorbance equation using the respective absorptivity values at 284.5 nm (isoabsorptive point) and 300 nm (<em>λ</em><sub>max</sub> of OMP). The drugs obey Beer’s Lambert’s law in the concentration range of 4-20 µg/mL and 2-10 µg/mL for AS and OMP respectively for both the methods. Limit of quantitation for Vierordt’s method for both the drugs was found to be 0.85 µg/mL, whereas for absorbance ratio method it was 0.68 and 0.88 µg/mL for AS and OMP respectively. % recovery for both the drugs was in the range of 99.78-100.31% indicating excellent accuracy for both the methods. The methods were precise, with a relative standard deviation of less than 1.25% for both drugs. The developed methods were validated according to ICH guidelines and values of accuracy, precision and other statistical analysis were found to be in good accordance with the prescribed values. Thus, both methods can be used for routine monitoring of drugs in industry for the assay of bulk drugs and commercial formulation (Yosprala).
Spectrophotometric methods,aspirin,Omeprazole,Vierordt’s,Q-absorbance equation
http://www.ajchem-a.com/article_93399.html
http://www.ajchem-a.com/article_93399_101527bce264b89d378bf25c1de90056.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Heavy Metal Release from Industrial Solid Wastes (Case Study: Khazar Steel Smelting Plant)
336
342
EN
Zahra
Zamiraei
0000-0002-9514-743X
Environmental Research Institute, Academic Center for Education, Culture & Research (ACECR), Rasht, Iran
zamiraei@gmail.com
Mohammad
Panahandeh
Environmental Research Institute, Academic Center for Education, Culture & Research (ACECR), Rasht, Iran
m1344_panahandeh@yahoo.com
Habib
Fathidokht
Environmental Research Institute, Academic Center for Education, Culture & Research (ACECR), Rasht, Iran
fathi.habib@yahoo.com
10.33945/SAMI/AJCA.2020.3.11
Information about the heavy metals release from industrial solid wastes is important for more reliable management of their environmental hazards. This study was conducted to investigate the effect of tissue of solid waste on the release of heavy metals from the steel smelting plant. After the investigation at the Khazar steel smelting (KSS) plant in Guilan province, its waste type, source, quantity and quality were characterized. The major wastes generated from the KSS plant were characterized to be the slag, furnace dust, and spent refractories. KSS solid wastes contained heavy metals in varying amounts, with the ranges of 1500-2200, 80–114, 6172-11100, 88-82, 48-29, 56-60, 4-14, 144-370 and 0.9-1.0 mg/kg<sup>−1</sup> for Mn, Cu, Zn, Ni, Cr, Co, Cd, Pb and As, respectively. The concentration of the iron was high in these wastes (109900-672000 mg/kg<sup>−1</sup>). The results confirmed the high concentration of heavy metals except for Arsenic. The TCLP results of the KSS dust and slag showed the almost all the heavy metals concentrations by the leaching test were lower than the detection limits except Fe (524.5-187.6 mg/kg<sup>-1</sup>) and Mn (14-10.10 mg/kg<sup>-1</sup>). According to the results, all the wastes generated by the KSS plant were reusable and recyclable.
Steel smelting,Waste Management,heavy metals,TCLP test
http://www.ajchem-a.com/article_102566.html
http://www.ajchem-a.com/article_102566_e162624981f91b8d48207f8df0d65a76.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Oxidation of Propane-1,3-diol (Non-Vicinal) by Potassium Permanganate in Aqueous Medium. A Kinetic Study
343
349
EN
Dayo Felix
Latona
Department of Pure and Applied Chemistry, Osun State University, PMB 4494 Osogbo, Nigeria
dayo.latona@uniosun.edu.ng
10.33945/SAMI/AJCA.2020.3.12
The oxidation of propane-1,3-diol by potassium permanganate in aqueous solution was investigated at λmax 525 nm. The rate of the reaction was found to increase with increase in [KMnO4] and [Propane-1,3-diol]. The reaction showed first order dependence each in [KMnO4] and [Propane-1,3-diol] and independent in the ionic strength of the solution. The values of 〖∆H〗^#(kJ mol-1), 〖∆S〗^# (kJK-1mol-1) and〖 ∆G〗^#(kJmol-1) were 24.98, -0.22 and 90.50 respectively. Negative entropy of activation revealed an ordered transition state for the reaction. Spectroscopic studies and FTIR analysis revealed the product of the reaction to be 3-hydroxyl-propanal.
Potassium permanganate,propane-1,3-diol,Kinetics,Mechanism
http://www.ajchem-a.com/article_93753.html
http://www.ajchem-a.com/article_93753_05ceabe267882d0d7798ee92270891bf.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Polygalacturonase Production by Aspergillus Niger Solid State Fermentation on Barley Bran and Sugar Beet Pulp Mixture
350
357
EN
Abolhasan
Alavi
Department of Chemistry Engineering, Science and Research branch, Islamic Azad University, Tehran, Iran
alavi.ab@gmail.com
Farahnoosh
Tahghighi Nia
Department of Chemistry Engineering, Science and Research branch, Islamic Azad University, Tehran, Iran
f.tahghighii@gmail.com
Farshid
Pajoom Shariati
Department of Chemistry Engineering, Science and Research branch, Islamic Azad University, Tehran, Iran
farshid.pajoom@gmail.com
10.33945/SAMI/AJCA.2020.3.13
In this research, barley bran mixtures with sugar beet pulp were used for polygalacturonase enzyme production by <em>Aspergillus niger</em> fungus in solid state fermentation method for the first time. Effect of some factors including carbon sources relative composition, fermentation time, fermentation temperature, inoculation amount, and moisture content were investigated and optimized amounts were selected. Different mixtures of barley bran and sugar beet pulp with various relative compositions were studied and highest enzyme activity was found for 50% w/w of barley bran and sugar beet pulp. Incubation temperature of 30 °C, time duration of 7 days, moisture content of 80% w/w, and 10 million spores per gram of dry substrate were selected as optimum amounts.
Polygalacturonase,Solid state fermentation,Aspergillus niger,Barley bran,Sugar beet pulp
http://www.ajchem-a.com/article_94182.html
http://www.ajchem-a.com/article_94182_96671efd7d5890580e74b891f25ce806.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Mobilization and Distribution of Arsenic with Other Metal Ions at Upstream and Downstream of River Meghna
358
369
EN
Kazi Mohammad
Anamoul Haque
Department of Arts & Science, Bangladesh Army University of Science & Technology, Saidpur, Bangladesh
anamnano@gmail.com
Mohd
Nur E Alam
Siddique
0000-0002-2077-9491
Assistant Professor, Chemistry
Dhaka Women College Under National University, Gazipur Dhaka
nalamsiddique@yahoo.com
A. H. M. Shofiul Islam Molla
Jamal
Scientific Officer, Institute of National Analytical Research and Service, BCSIR, Dhaka, Bangladesh
shofiuljamal@yahoo.com
Md
Anawarul Islam
Department of Chemistry, University of Dhaka, Dhaka, Bangladesh
manwaruli@yahoo.com
10.33945/SAMI/AJCA.2020.3.14
Geochemical study of toxic metal arsenic along with heavy metals (Fe. Mn and Cu), of borehole sediments of the Kushiara and Meghna, rivers in Bangladesh was conducted to investigate the mobilization, distribution and correlation of arsenic with depth, nature of sediment and locations of sampling site, had been included to the study. The Kushiara is the upstream part of Meghna river. Sampling locations were carried out at Sherpur (Moulvibazar) and Beanibazar (Sylhet) for Kushiara river, which is one of the upper stream part of Meghna river. Samplings of borehole sediments collection have been done from Mohonpur (Chandpur) and Chandpur town (Chandpur) for the Meghna river. The borehole sediments were dried in the oven till constant weight and digested it nitric and perchloric acid (3:2) in fume cup hood in the laboratory. The digested sample were analyzed by Ag-DDTC UV visible Spectrophotmeter for arsenic also analysis of Fe. Mn and Cu in borehole sediment by Flame AAS. The average concentration of arsenic was found 6.39 mg/Kg in Borehole sediment for Kushiara river (Beanibazar and Sherpur), 5.00 mg/Kg for Meghna river (Mohonpur and Chandpur). The highest amount of arsenic (12.30 mg/Kg) was found in grayish clay type sediment at upstream of Kushiara river at Beanibazar. It is evident from the study, that arsenic is mobilized from upper stream to lower stream. In addition, it also reveals that high amount of Fe and Mn was in sediment sample. Statistical analysis shows that arsenic is strongly correlated with Mn and Fe but weakly correlated with Cu. In nature FeOOH occurs is yellowish in color and MnOOH is gray in color, these two of oxy-hydroxides may be scavengers of arsenic. It was indicated that the occurrence of FeSO<sub>4, </sub>MnSO<sub>4</sub> and CuSO<sub>4</sub> is predominant in all of the borehole sediment of Kushiara and Meghna rivers.
ARSENIC,other metal,borehole sediments. Meghna River,Bangladesh
http://www.ajchem-a.com/article_95737.html
http://www.ajchem-a.com/article_95737_22245e456cf66b194fa037c12e96469b.pdf
Sami Publishing Company
Advanced Journal of Chemistry, Section A
2645-7768
2645-5676
3
3
2020
05
01
Effect of Insulation Layer Composite and Water Adsorption on Bonding Performance in Heat Barriers
370
377
EN
Mahmoud Emad
Awad
0000-0003-2861-3813
Department of Chemical Engineering, Cairo University, Cairo, Egypt
ma7mood.3emad@gmail.com
Mohamed
Nasser
Department of Chemical Engineering, Cairo University, Cairo, Egypt
eng.10449@gmail.com
10.33945/SAMI/AJCA.2020.3.15
Thermal insulation layer in solid rocket motors is a vital component during the rocket flight. Many factors can affect the performance of this insulation layer. Bonding property between rocket propellant and the thermal insulation layer are examined in this study. Hydroxyl terminated polybutadiene (HTPB) and isophorone diisocyanate (IPDI) as a curative was chosen as the most common type of rocket propellant. The effect of two types of polymeric insulation layer such as nitrile butadiene rubber (NBR) and ethylene-propylene-diene monomer (EPDM), on the bonding performance at the interface between (HTPB/IPDI) propellant and the respective insulation layer has been investigated. Results revealed that both types of insulation layer considerably decreased the interfacial bonding performance of the (HTPB/IPDI) propellant. NBR was proven to be more severe on weakening the adhesion strength than that of the EPDM. We further investigated the effects of the thickness and water content of NBR on the bonding performance, and proved that bonding strength was inversely proportional to the thickness and the water content.
Solid Rocket Motor,HTPB propellant,Insulation layer,Bonding property
http://www.ajchem-a.com/article_95803.html
http://www.ajchem-a.com/article_95803_20984a1d4c05d65fe5f06e8257b0a864.pdf