eng
Sami Publishing Company
Progress in Chemical and Biochemical Research
2676-7090
2645-6133
2018-10-01
1
1
1
10
10.29088/SAMI/PCBR.2018.1.110
74124
Ultrasensitive and selective non-enzymatic glucose detection based on pt electrode modified by carbon nanotubes@ graphene oxide/ nickel hydroxide-Nafion hybrid composite in alkaline media
Sirous Mohammadi
mohammadisirous@yahoo.com
1
Alireza Taheri
alirezachem@gmail.com
2
Zeinab Rezayati-Zad
zeinabchemrad61@gmail.com
3
Department of Chemistry, Islamic Azad University, Ilam branch, Ilam, Iran
Department of Chemistry, Islamic Azad University, Ilam branch, Ilam, Iran
Department of Food and Drug, Faculty of Medicine, Ilam University of Medical Sciences, Ilam, Iran
A new enzymeless glucose sensor has been fabricated and its electrocatalytic oxidation has been investigated in alkaline medium directly on the Pt Electrode modified by Activated carbon nanotubes @ graphene oxide/ nickel hydroxide-Nafion hybrid composite (PtACNT@GONHNPsNf). Under the optimized condition, the calibration curve is linear in the concentration range of 5-1100 µM using cyclic voltammetric method. The detection limit and sensitivity are 0.75 µM and 40 nA, respectively. The glucose sensor can be renewed easily in a reproducible manner by a simple polishing step and it has a long operational lifetime and short response time t90% < 1 s. In addition, the fabrication of Pt with nafion and nickel hydroxide powder was employed to eliminate the interference of ascorbic acid during the catalytic oxidation of glucose. The biosensor was used for determination of glucose in human blood serum and the oxidant with satisfactory results.
https://www.pcbiochemres.com/article_74124_a5194e8f45e8a054dde1df3a88cf4c27.pdf
Ni(OH)2 nanoparticles
Activated Carbon nanotubes
Nafion
Glucose sensor
graphene oxide
eng
Sami Publishing Company
Progress in Chemical and Biochemical Research
2676-7090
2645-6133
2018-10-01
1
1
11
18
10.29088/SAMI/PCBR.2018.1.1118
79217
Cyclic Voltammetric studies of calcium acetate salt with Methylene blue (MB) Using Gold Electrode
M Eldefrawy
mmeldefrawy@hotmail.com
1
Essamhassan G Arafa Gomaa
eahgomaa65@yahoo.com
2
Shereen Salem
sara_salem669@yahoo.com
3
Fatma Abdel Razik
chemical9914@gmail.com
4
Chemistry Department,Faculty of Science, Mansoura University, Mansoura, Egypt.
Chemistry Department,Faculty of Science, Mansoura University, Mansoura, Egypt.
Chemistry Department,Faculty of Science, Mansoura University, Mansoura, Egypt.
Chemistry Department,Faculty of Science, Mansoura University, Mansoura, Egypt.
Cyclic Voltammetric studies of calcium acetate salt [Ca(CH3COO)2] in absence or presence of Methylene blue (MB) were performed to predict and analyze the behavior of complexation between the ligand and metal ion in aqueous solution. From these studies, the values of solvation and kinetic parameters [Ep (peak potential), Ip(peak current), ΔEp (peak potential difference), E½ (half wave potential), D(Diffusion coefficient), Ks (electron transfer rate constant), Г(surface coverage) and Qa (quantity of electricity)] were evaluated. In addition, the effect of different concentration and a scan rate of above the calculated quantities were studied. In case of presence MB, the stability constants and Gibbs free energies were performed.
https://www.pcbiochemres.com/article_79217_4b9722513337236f531ceab6f13bbc07.pdf
Cyclic Voltammetry
Gold Electrode
Calcium acetate
Methylene blue
redox reaction
Solvation parameters
eng
Sami Publishing Company
Progress in Chemical and Biochemical Research
2676-7090
2645-6133
2018-10-01
1
1
19
28
10.29088/SAMI/PCBR.2018.1.1928
79435
Thermodynamic and Theoretical solvation parameters for 2-amino-4,5-dimethylthiophene-3-carboxamide(ADTC) in Ethanol and Mixed EtOH-H2O solvents
Essamhassan G Arafa Gomaa
eahgomaa65@yahoo.com
1
Moged A. Berghout
dal_mag@hotmail.com
2
Mohamed R. Moustafa
ramzy1950@mans.edu.eg
3
Fathy M. El Taweel
fathyeltaweel@du.edu.eg
4
Hader M . Farid
hodhod8787@yahoo.com
5
Chemistry Department, Faculty of Science, Mansoura University, 35516-Mansoura, Egypt
Chemistry Department, Faculty of Science, Mansoura University, 35516-Mansoura, Egypt
Chemistry Department, Faculty of Science, Damietta University, Damietta, Egypt
Chemistry Department, Faculty of Science, Damietta University, Damietta, Egypt
Chemistry Department, Faculty of Science, Mansoura University, 35516-Mansoura, Egypt
The molar solubility for 2-amino-4,5-dimethylthiophene-3-carboxamide (ADTC) in pure ethanol and mixed ethanol (EtOH)- water solvents were measured at five different temperatures, 293.15, 298.15, 303.15, 308.15, and 313.15 K in the used mixed solvents, the solubility were increase by increase in the mole fraction of ethanol in the mixtures and increase of temperature due to more salvation parameters. All the solvation and thermodynamic parameters for ADTC in mixed EtOH+ H2O solvents were evaluated like solubility products, Gibbs free energies, enthalpies and entropies of solvation and discussed. Theoretical calculations for (ADTC) were done quantum mechanically by using Gaussian on set of calculations in ethanol for evaluating the different thermodynamic parameters.
https://www.pcbiochemres.com/article_79435_9448981fc60338a15d08a5537ec93a72.pdf
Thermodynamic
Theoretical solvation
Dimethylthiophene-caboxamide
eng
Sami Publishing Company
Progress in Chemical and Biochemical Research
2676-7090
2645-6133
2018-10-01
1
1
29
39
10.29088/SAMI/PCBR.2018.1.2939
80788
Antiulcerogenic Activity of methanol extract and solvent fractions of Stem Bark of Lannea acida (A. Rich) Against Ethanol-Induced Gastric Mucosal Injury in Albino Rats
Onoshe Solomon
biopattkonsult@gmail.com
1
Wasagu Rabiu Saidu Umar
2
Hassan Sanusi Wara
3
Abubakar Sadiq Yakubu
4
Madusolumou Michael Azubuike
5
Mbahi Asugu Mary
6
Hitler Louis
louis@nanoctr.cn
7
Department of Biochemistry, Usmanu Danfodiyo University, Sokoto, Nigeria.
Department of Biochemistry, Usmanu Danfodiyo University, Sokoto, Nigeria.
Department of Biochemistry, Usmanu Danfodiyo University, Sokoto, Nigeria.
Department of Veterinary Medicine and Surgery, Usmanu Danfodiyo University, Sokoto, Nigeria.
Department of Biochemistry, School of Life sciences, Modibbo Adama University of Technology, Yola, Nigeria.
Department of Biological Sciences, Federal University Kashere, Gombe, Nigeria.
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Centre for Excellence in Nanoscience, National Centre for Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100191, China
Peptic ulcer disease is one of the most prevalent gastrointestinal disorders causing tremendous human suffering worldwide. The present study was designed to evaluate the antiulcerogenic activity of the methanol and solvent stem bark fractions (hexane, ethyl acetate and butanol) and elucidate their possible antiulcerogenic mechanisms. The antiulcerogenic mechanisms were investigated by estimation of Superoxide dismutase (SOD), Glutathione (GSH), Catalase (CAT), Vitamins A, C and E, Malondialdehyde (MDA) and involvement of KATp channel. Pretreatment with the methanol extract and solvent fractions produce significant reductions in ulcer index in a dose dependent manner. Ethylacetate fraction (EtyAc) showed the highest antiulcer activity. Elevated MDA and decreased levels of SOD, GSH, CAT, Vitamin A, C and E observed in ulcer control groups were significantly decreased and increased respectively in the EtyAc fraction treated groups. Antiulcer activity of the EtyAc fraction was blocked upon coadministration with glibenclamide; a KATp channel blocker. The stem bark extract of Lannea acida possess antiulcerogenic activity and the mechanisms seems to involve antioxidant activity and KATp channel opening.
https://www.pcbiochemres.com/article_80788_be839c7487bc13a7114b382d717ee1f0.pdf
Antiulcerogenic
Lannea acida
Mechanism, Ethanol
Gastric
Mucosal
Albino Rats
eng
Sami Publishing Company
Progress in Chemical and Biochemical Research
2676-7090
2645-6133
2018-10-01
1
1
40
49
10.29088/SAMI/PCBR.2018.1.4049
81409
Reduced graphene oxide based on simultaneous detection of neurotransmitters
G. Vinodhkumar
1
R Ramya
wilson.j2008@yahoo.com
2
mark vimalan
myresearch1121@gmail.com
3
I Potheher
potheher11@gmail.com
4
A. Cyrac Peter
cyrac.peter@gmail.com
5
Department of Physics, Raja Doraisingam Govt. Arts College, Sivaganga, India.
Department of Bioelectronics and Biosensors, Alagappa University, Karaikudi, India.
Department of Physics, Thirumalai Engineering College, Kilambi, Kancheepuram, India
Department of Physics, Bharathidasan Institute of Technology (BIT) Campus, Anna University, Thiruchirappalli, India.
Department of Physics, Raja Doraisingam Govt. Arts College, Sivaganga, India.
Reduced graphene oxide (rGO) is synthesized using strong oxidizing agents with the help of chemical reduction method. Structural and physiochemical properties of the prepared sample are studied by ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). UV-Vis spectra of GO exhibit maximum absorption peak attributable to restoration of sp 2carbon. Electrochemical study performed for bare and rGO modified glassy carbon electrode. Electrochemical sensing of Dopamine (DA) and Uric Acid (UA) was examined by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and square wave voltammetry (SWV) were conducted in phosphate buffer solution (PBS) at pH = 7.0 done for both simultaneous and individual determination of DA and UA in the range of 500nM – 1mM exhibit a wide linear range of detection and having low limit of detection (LOD) of 0.67µM for DA, and 0.69µM for UA estimated for simultaneous determination and in individual determination it was found to be 0.51µM and 0.42µM for DA and UA respectively. Additionally, the modified electrode exhibits good reproducibility, selectivity, sensitivity and stability. The proposed sensor could be applied for the determination of DA and UA in real samples.
https://www.pcbiochemres.com/article_81409_b33d93b6d7246a1fba911be8c1f02385.pdf
Graphene oxide (GO)
Hummer’s method
Cyclic Voltammetry
Electrochemical sensor
Dopamine
Uric Acid
eng
Sami Publishing Company
Progress in Chemical and Biochemical Research
2676-7090
2645-6133
2018-10-01
1
1
50
59
10.29088/SAMI/PCBR.2018.1.5059
81617
Sorptive chelation of metals by inorganic functionalized organic WOx–EDA nanowires: adsorbent characterization and isotherm studies
Adams Itodo
itodoson2002@gmail.com
1
Ohemu Michael Itodo
2
Esther Iornumbe
3
Michael Omotola Fayomi
4
Department of Chemistry, Federal University of Agriculture, PMB 2373 Makurdi, Nigeria
Department of Chemistry, Federal University of Agriculture, PMB 2373 Makurdi, Nigeria
Department of Chemistry, Federal University of Agriculture, PMB 2373 Makurdi, Nigeria
Department of Chemistry, Federal University of Agriculture, PMB 2373 Makurdi, Nigeria
Synthesis and Characterization of Inorganic–organic hybrid Tungsten oxide-ethylenediamine (WOx–EDA) nanowires have been carried out by a simple, low-cost and high-yield solvo-thermal method. The WOx–EDA nanowire adsorbent was characterized using, Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Energy Dispersive X-ray spectroscopy (EDX). Adsorptive potential of the hybrid for aqueous phase copper and lead removal was investigated using batch adsorption process. The equilibrium data were subjected to various isotherm models. The Langmuir model shows high applicability (R2 of 0.921) for lead uptake. Other R2 values include 0.882 (for Freundlich model), 0.947 (Temkin) and 0.972 (Dubinin- Radushkevich). Similarly, adsorption experimental runs for Cu uptake gave correlation coefficient (R2) values of 0.972, 0.584, 0.906 and 0.899 for the Langmuir, Freundlich, Temkin and Dubinin- Radushkevich isotherm models respectively. Overall, Tungsten oxide ethylenediamine adsorbent proved its potential candidature for the chelating treatment of Pb and Cu poisoning as well as purifications of water containing such metals. Sorptive chelation of metals by inorganic functionalized organic WOx–EDA nanowires: adsorbent characterization and isotherm studies
https://www.pcbiochemres.com/article_81617_3ef9fd9e7d210a5249688a506c630bfc.pdf
Adsorption
Tungsten oxide-ethylenediamine
Metals
copper
Lead
Isotherm
Nanotubes
Nanobelts