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Zulfiqar Ali Raza,Umaira Bilal,Unsa Noreen,Somayyah Abdul Munim,Shahina Riaz,Muhammad Umar Abdullah,Sharjeel Abid 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
Cellulosic materials being biodegradable are susceptible to bacterial attack. Present study was meant to develop anantibacterial viscose fabric via a clean, easy and reproducible approach. Silver nanoparticles (SNPs) were prepared usingchitosan both as reducing and as well as stabilizing agent to promote green synthesis of SNPs. The prepared SNPs werecharacterized using dynamic light scattering and UV-visible (vis) absorption spectroscopy. The average size of SNPs wasfound to be 8.574 nm with respective zeta potential of +45.2 mV using AgNO3 concentration of 1 mM and chitosan as 1 %(w/v). Pre-treated viscose fabric was undergone an in situ treatment to impregnate SNPs on its surface under certain autoclaveconditions. Scanning electron microscopy revealed the presence of SNPs on surface of treated viscose fabric in comparisonwith the untreated fabric. In addition, Fourier transform infrared and elemental analysis confirmed the presence of silver onthe treated fabric. The textile properties of the viscose fabric samples like; tensile strength, wettability, antibacterial activityand whiteness were evaluated using the standard protocols. The developed treated viscose fabric showed good antibacterialproperties against both Gram negative Escherichia coli and Gram-positive Staphylococcus aureus bacterial strains with fairtextile characteristics. This is the first report on in situ fabrication and impregnation of SNPs using chitosan as both reducingand stabilizing agent on a regenerated cellulose fabric like viscose.
Abdul Rehman Umar,Kashif Hussain,Zara Aslam,Muhammad Anwar Ul Haq,Haji Muhammadb,Sirajuddin,Muhammad Raza Shah 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
This work was initiated by synthesizing a carboxylic derivative of Calix[4]resorcinarene through a threestep protocol confirmed by proton nuclear magnetic resonance (1H NMR) spectroscopy and Electrosprayionization mass spectroscopy (ESI-MS). As synthesized derivative, was used as reducing and cappingmaterial for the fabrication of small and stable silver nanoparticles (AgNPs) in aqueous medium underthe combined influence of dilute alkali and heat at 90 C. These nanoparticles were referred as KM20-AgNPs. Techniques used for characterization of AgNPs include UV–Visible (UV–Vis) spectroscopy,Fourier transform infra-red (FTIR) spectroscopy, atomic force microscopy (AFM), dynamic light scattering(DLS) and zeta potential analyzer (ZPA). The finally produced KM20-AgNPs were recognized as highlysensitive and extremely selective voltammetric sensor for low level detection of methylene blue drugin the linear working range of 1–30 nM with limit of detection (LOD) and limit of quantification (LOQ)as 0.16 nM and 0.53 nM respectively. The developed sensor was successfully used for sensing of MB inhuman blood plasma.
Rauf, Abdur,Uddin, Ghias,Raza, Muslim,Ahmad, Aftab,Jehan, Noor,Ahmad, Bashir,Nisar, Muhammad,Molnar, Joseph,Csonka, Akos,Szabo, Diana,Khan, Ajmal,Farooq, Umar,Noor, Mah Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4
Pistagremic acid (PA) is a bioactive triterpenoid isolated from various parts of Pistacia integerrima plants. The aim of this research was to investigate PA for reversion of multidrug resistant (MDR) mediated by P-glycoprotein using rhodamine-123 exclusion study on a multidrug resistant human ABCB1 (ATP-binding cassette, sub-family B, member 1) gene-transfected mouse T-lymphoma cell line in vitro. Results were similar to those with verapamil as a positive control. Docking studies of PA and standard Rhodamine123 were carried out against a P-gp crystal structure which showed satisfactory results. Actually, PA cannot bind exactly where co-crystallized ligand of P-gp is already present. However, the docking study predicted that if a compound gives a lesser score then it may have some potency. The docking scores of PA and Rhodamine were similar. Therefore, we can conclude that there are certain important chemical features of PA which are responsible for the inhibiting potency of P-gp.
Shujaat Ali,Abdul Rehman Umar,Kashif Hussain,Haji Muhammad,Muddasir Hanif,Mouna Hind Laiche,Sufian Rasheed,Kousar Yasmeen,Abdul Hameed,Muhammad Raza Shah 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
It’s crucial to develop cost-effective, rapid & reliable detection methods of specific analytes through sensorsuseful in the analytical and medicinal chemistry. We report a highly sensitive and selective colorimetricmethod for the detection of clonazepam by the new composite sensor DH-1,6-NAPY-8-CNAgNPscontaining 5-amino-7-(4-benzylpiperazin-1-yl)-2,4-bis(4-bromophenyl)-2-methyl-1,3-dihydro-1,6-naphthyridine-8-carbonitrile capped silver nanoparticles (AgNPs). The detection mechanism is basedon the H-bonding interactions between clonazepam and the sensor, that caused the aggregation of NPsthat initiated a sharp color change from yellow to red. The linear relationship between the adjacentabsorbance values (DA) vs. clonazepam concentration (range = 0.05–75 lM) showed a correlation coefficientof 0.9927. The limit of detection (LOD) was 3 nM, that is very significant achievement over theexisting reports. The proposed sensor is highly selective, with no interference from many other possibleinterfering substances. The sensor was successfully applied to the aqueous and human plasma samples,therefore DH-1,6-NAPY-8-CN-AgNPs demonstrated great potential for the on-site and real-time screeningof Clonazepam.