19 research outputs found
Development of an ultra-sensitive para-nitrophenol sensor using tri-metallic oxide MoO2·Fe3O4·CuO nanocomposites
No full textA tri-metal oxide, MoO2·Fe3O4·CuO (TMO), was synthesized by the co-precipitation method and characterized by XRD, SEM-EDS, and FTIR. The average particle size of the nanocomposite was found to be 34.85 nm. The zeta potential and hydrodynamic size of the MoO2·Fe3O4·CuO nanocomposite were studied in acidic and basic pH respectively. A glassy carbon electrode (GCE) was modified by MoO2·Fe3O4·CuO to develop a chemical sensor for para-nitrophenol (p-NP). A simple I–V method was employed for this study. Excellent sensitivity, an ultra-low detection limit, long-term stability, and reproducibility of the MoO2·Fe3O4·CuO/Nafion/GCE sensor were observed towards p-NP. A linear calibration plot (r2: 0.9995) was obtained for 1.0 pM to 0.01 mM aqueous p-NP solution, with a sensitivity value of 5.2430 μA μM−1 cm−2 and remarkably low detection limit (LOD) of 0.2 pM.Full Tex
/CuO/ZnO ternary mixed metal oxide nano‐composites for sustainable environment
No full textIn this study, by using a co-precipitation method MoO3/CuO/ZnO nanocomposite material was synthesized. Then the prepared material was fully characterized by using XRD (X-ray diffraction), SEM (scanning electron microscopy), EDS (energy dispersive x-ray spectroscopy), CV (cyclic voltammetry), and EIS (Electrochemical Impedance Spectroscopy). Zeta potential and hydrodynamic size were measured using a Zetasizer in PBS buffer. By using Scherrer's formula from XRD, particle size was determined which was around 26.5 nm. For the promising chemical sensor development, MoO3/CuO/ZnO nanocomposite material was fabricated onto a glassy carbon electrode (GCE) to provide a sensor probe with a fast response towards the selective hydrazine (HZ) toxin in phosphate buffer phase. The fabricated sensor probe is exhibited good sensitivity and long-term stability as well as enhanced electrochemical performances. A calibration plot was found linear in the range of 0.2 nM to 2.0 mM (linear dynamic range, LDR) in presence of aqueous HZ solutions with highest sensitivity value and lower limit of detection and good limit of quantification (LOQ). This approach is promising as an efficient technique in developing a highly effective sensor probe with ternary metal oxides for detecting environmental pollutants on a broad scale.Full Tex
Nanomaterials
No full textThe synthesized MgTi2O4⋅TiO2⋅Zn2TiO4 nanomaterial was characterized by XRD (X-Ray diffraction), SEM (Scanning electron microscopy), EDS (Energy dispersive x-ray spectroscopy), FTIR (Fourier transform infrared spectroscopy) and PL (Photoluminescence) study. Particles size of MgTi2O4⋅TiO2⋅Zn2TiO4 nanomaterial was found to be 37.3 nm. PL and PLE (Photoluminescence excitation) spectra are showed several peaks including one red PL at 723 nm, when excited at 320 nm. Nanomaterial was subject to electrochemical sensor study. Thin layer of synthesized MgTi2O4⋅TiO2⋅Zn2TiO4 nanomaterials was fabricated onto the glassy carbon electrode (GCE) with conducting binder to result the working electrode of 4-nitrophenylhydrazine (4-NPHyd) sensor, which was applied successively to selectively detect the 4-NPHyd in aqueous phase. The 4-NPHyd chemical sensor exhibited high sensitivity with lower detection limit, long-term stability in chemical environment and improved electrochemical responses during sensing performance. The linearity of calibration plot is obtained over the large linear dynamic range (LDR) from 0.1 nM to 0.1 mM of 4-NPHyd. The sensitivity calculated from the slop of calibration plot (ratio of current to concentration of 4-NPHyd) is 42.7215 μAmM−1cm−2 with detection limit (DL) of 0.02±0.001 nM at signal to noise ratio of 3(S/N). Therefore, the chemical sensor based on MgTi2O4⋅TiO2⋅Zn2TiO4 nanomaterials may be a promising highly sensitive sensor in electrochemical method for the effective detection of hazardous and carcinogenic chemicals in medical as well as biological sectors.No Full Tex
NIR red luminescent doped Ag·(Y0.95Eu0.05)2O3 nanocomposite for 3-Chlorophenol sensor probe and anti-MDR bacterial application
No full textNanocomposite, Ag·(Y0.95Eu0.05)2O3 was characterized by XRD, SEM, EDS, TEM, FTIR and PL. Cubic morphology of Ag·(Y0.95Eu0.05)2O3 nanocomposite was observed with an average crystallite size of 43.78 nm. The materials showed excellent low temperature NIR red PL properties at 100 K, when excited by HeCd laser at 325 nm. The materials exhibited remarkable biological properties against MDR bacteria. The proposed sensor was assembled by depositing Ag·(Y0.95Eu0.05)2O3 nanocomposite on the flat part of a GCE to result a thin layer of nanocomposite and the sensor was applied to detect 3-CP in buffer solution in an electrochemical approach. To evaluate the sensor performances, the sensor calibration by plotting current versus concentration of 3-CP is executed, where currents data are distributed on a line from 0.1 nM to 0.01 mM defined as linear dynamic range (LDR) for 3-CP detection in buffer solution. The sensitivity of 3-CP sensor is calculated based on the slope of LDR considering the active surface area of GCE, which is equal to 23.5189 µAµM−1cm−2. The limit of detection (LOD) is calculated from the signal/noise ratio of 3, which is equal to 40.37 ± 2.02 pM. Besides this, the sensor parameters including reproducibility, response time and stability for long-time performance are evaluated in detail and found as reliable. Moreover, the real-time applicability of 3-CP sensor is tested by the electrochemical analysis of collected samples from environmental sources.No Full Tex
Photocatalytic performance, anti-bacterial activities and 3-chlorophenol sensor fabrication using MnAl(2)O(4)·ZnAl(2)O(4) nanomaterials
No full textA MnAl(2)O(4)·ZnAl(2)O(4) nanomaterial was synthesized by co-precipitation and characterized by XRD, SEM, EDS, TEM, AFM, FTIR, PL, CV and EIS. The photocatalytic activity of the nanocomposite against MV dye and its MDR anti-bacterial functions were studied. The nanocomposite shows excellent photocatalytic as well as anti-bacterial activity. A MnAl(2)O(4)·ZnAl(2)O(4) nanomaterial/Nafion/GCE electrode was fabricated and implemented as the working electrode of a 3-CP sensor. The sensor exhibited good sensitivity, with the lowest detection limit, fast response time, large linear dynamic range (LDR), and long-term stability in the chemical environment. The estimated sensitivity is 70.07 μA mM(−1) cm(−2). The LDR, limit of detection (LOD), and limit of quantification (LOQ) are 0.1 nM to 0.01 M, 0.0014 ± 0.0001 nM, and 0.004 nM, respectively. The MnAl(2)O(4)·ZnAl(2)O(4) nanomaterial/Nafion/GCE is a promising fabricated sensor probe for the selective detection of 3-CP for the environmental safety and healthcare fields on a large scale
Photocatalysis, photoinduced enhanced anti-bacterial functions and development of a selective m-tolyl hydrazine sensor based on mixed Ag·NiMn(2)O(4) nanomaterials
No full textIn this work, a tri-metal based nanocomposite was synthesized and characterized. A detailed investigation of the photocatalytic dye degradation efficiency of the nanocomposite under visible light showed promising results in a wide pH range, both acidic and basic medium. Studies on anti-bacterial activity against seven pathogenic bacteria, including both Gram positive and Gram negative species, were conducted in the presence and absence of light and compared with the standard antibiotic gentamicin. The minimum inhibitory concentration (MIC) values of Ag·NiMn(2)O(4) against multidrug-resistant (MDR) pathogens ranged from 0.008 to 0.65 μg μL(−1), while the minimum bactericidal concentration (MBC) was found to be 0.0016 μg μL(−1). The nanomaterial, Ag·NiMn(2)O(4) was deposited onto the surface of a glassy carbon electrode (GCE; 0.0316 cm(2)) as a thin film to fabricate the chemical sensor probe. The proposed sensor showed linear current (vs. concentration) response to m-THyd (m-tolyl hydrazine) from 1.0 pM to 0.01 mM, which is denoted as the linear dynamic range (LDR). The estimated sensitivity and detection limit of the m-THyd sensor were found to be 47.275 μA μM(−1) cm(−2) and 0.97 ± 0.05 pM, respectively. As a potential sensor, it is reliable due to its good reproducibility, rapid response, higher sensitivity, working stability for long duration and efficiency in the analysis of real environmental samples
THE DYNAMIC OF MALAY ISLAMIC LAW: The Rise and Practices of Adat Bersendi Syarak, Syarak Bersendi Kitabullah in Jambi
Get PDFThis study aims at determining the position of Islamic law in the culture of Malay society in Jambi, Sumatera. The obvious facts in the previous studies about Islamic law and culture in Malay Sumatera is heavy emphasis on Minangkabau of West Sumatera with its matrilineal culture and traditionalist-modernist tension. In contrast, Jambi, which is adjacent to Minangkabau region, is starkly different. Jambi culture does not recognize matrilineal culture, except for Minangkabau people migrating to Jambi, nor experience such a tension. This is evidenced from interviews and library sources alike. Interviews were undertaken from several members of traditional leaders including some of the decendents of Jambi Malay Kingdom. As the result, even though there was a was among devotees of each of the laws, Islamic law (Syarak) and customary law in greater Malay Sumatera, the aphorism “Customary laws are based on religious laws; religious laws are based on the Holy Book” unites them, and becomes the living law that rules Muslim society in Jambi from the past until present day
Efficient selective 4-aminophenol sensing and antibacterial activity of ternary Ag2O3 center dot SnO2 center dot Cr2O3 nanoparticles
No full textIn this study, Ag2O3·SnO2·Cr2O3 nanoparticles (NPs) were synthesized via a simple and quick co-precipitation method. The produced materials were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and photoluminescence (PL) spectroscopy. The hydrodynamic size and zeta potential were measured under acidic and basic pH conditions. The photocatalytic activities of the newly synthesized composite were studied considering various parameters. Antibacterial activity tests showed that Ag2O3·SnO2·Cr2O3 is an excellent anti-bacterial agent. A reliable electrochemical sensor probe was designed by depositing the synthesized Ag2O3·SnO2·Cr2O3 NPs onto the flat part of GCE, which showed excellent oxidation activity and selectivity towards 4-aminophenol (4-AP) in a phosphate buffer medium. During electrochemical analysis, the desired 4-AP sensor responded linearly over a large concentration range (0.1 nM–0.01 mM), which is known as the linear dynamic range (LDR), and exhibited appreciable sensitivity (25.1962 μA μM−1 cm−2). Furthermore, it showed a considerably low limit of detection (98.41 ± 4.92 pM), good reproducibility, fast response (20.0 s), and long-term stability in the phosphate buffer medium. This is an efficient method for the fabrication of a selective electrochemical sensor using the electrochemical approach for safety in environmental and healthcare fields.No Full Tex
Potential Health Benefits of Anthocyanins in Oxidative Stress Related Disorders
Get PDFAnthocyanins are naturally occurring water-soluble plant pigments belonging to the flavonoids chemical class. The red, blue and purple colours of leaves, flowers and fruits of plants confirm that they are rich sources of anthocyanins. Many in vivo and in vitro studies reveal that anthocyanins have different health beneficial effects such as antioxidant, antidiabetic, anti-inflammatory, anti-obesity, antihypertensive and anticancer properties. Major benefits of anthocyanin administration are owing to their potent anti-inflammatory and antioxidant activities. Recent investigations have revealed that anti-inflammatory activities of anthocyanins follow the inhibitory pathways of NFкB-mediated decline of inflammatory cytokines production. Inhibition of the anti-inflammatory pathways also influences the modulation of arteriolar disorders and cardiovascular complications due to anthocyanin administration. Moreover, anthocyanins improve diabetes, obesity and cancer pathology by inhibiting NF-кB-mediated inflammatory pathways. However, considerable variations in activities do exist among structurally diverse anthocyanins. This review appraises the recent literature regarding the health benefits of anthocyanins and their molecular mechanisms in various oxidative stress related pathophysiological conditions
Apocynin prevented inflammation and oxidative stress in carbon tetrachloride induced hepatic dysfunction in rats
Get PDFBackground: Liver fibrosis is a leading pathway to cirrhosis and a global clinical issue. Oxidative stress mediated tissue damage is one of the prime causes of hepatic dysfunction and fibrosis. Apocynin is one of many strong antioxidants. Objective: To evaluate the effect of apocynin in the CCl4 administered hepatic dysfunction in rats. Methods: Female Long Evans rats were administered with CCl4 orally (1 mL/kg) twice a week for 2 weeks and were treated with apocynin (100 mg/kg). Both plasma and liver tissues were analyzed for alanine aminotransferase (ALT), aspartate aminotransferase (AST) and alkaline phosphatase activities. Oxidative stress parameters were also measured by determining malondialdehyde (MDA), nitric oxide (NO), myeloperoxidase (MPO), advanced protein oxidation product (APOP). In addition, antioxidant enzyme activities such as superoxide dismutase (SOD) and catalase activities in plasma and liver tissues were analyzed. Moreover, inflammation and tissue fibrosis were confirmed by histological staining of liver tissue sections. Results: Apocynin significantly reduced serum AST, ALT, and ALP activities in carbon tetrachloride treated rats. It also exhibited a considerable reduction of the oxidative stress markers (MDA, MPO, NO, and APOP level) which was elevated due to CCl4 administration in rats. Apocynin treatment also restored the catalase and superoxide dismutase activity in CCl4 treated rats. Histological analysis of liver sections revealed that apocynin prevented inflammatory cells infiltration and fibrosis in CCl4 administered rats. Conclusion: These results suggest that apocynin protects liver damage induced by CCl4 by inhibiting lipid peroxidation and stimulating the cellular antioxidant system
