Characterization, Antimicrobial Activity, and Mechanism of a High-Performance (−)-Epigallocatechin-3-gallate (EGCG)−CuII/Polyvinyl Alcohol (PVA) Nanofibrous Membrane

2011 ◽  
Vol 59 (9) ◽  
pp. 5087-5092 ◽  
Author(s):  
Li-ming Sun ◽  
Chen-lu Zhang ◽  
Ping Li
Keyword(s):  
Antimicrobial Activity ◽  
Polyvinyl Alcohol ◽  
High Performance ◽  
Nanofibrous Membrane

Development and Validation of a Novel Reversed Phase High Performance Liquid Chromatography with Refractive Index Detector Method for Assay of Polyvinyl Alcohol in an Ophthalmic Solution

2020 ◽  
Vol 16 (7) ◽  
pp. 867-871
Author(s):  
Harun Ergen ◽  
Muge Guleli ◽  
Cigdem Sener ◽  
Cem Caliskan ◽  
Sercan Semiz ◽  
...  
Keyword(s):  
Refractive Index ◽  
Liquid Chromatography ◽  
Polyvinyl Alcohol ◽  
High Performance ◽  
Ophthalmic Solution ◽  
Reversed Phase ◽  
Hplc Method ◽  
Solution Stability ◽  
Technical Requirements ◽  
Refractive Index Detector

Introduction: Polyvinyl alcohol (PVA), a polymer, is in demand due to its usage in different applications such as pharmaceutical, biomedical and textile, paper, food industries. Methods: A new sensitive reversed phased high-pressure liquid chromatography (RP-HPLC) method with refractive index detector (RID) was developed for determination of PVA in an ophthalmic solution containing dexpanthenol and PVA as active substances and it was validated according to The International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH) guideline. Results: Chromatographic separation was achieved on a Chiral-AGP (150 mm × 4.0 mm, 5 μm) column kept at 30°C with an isocratic flow at a flow rate of 1.0 ml/min. The detector temperature was 30°C, the retention time of PVA was around 1.0 min and the total run time was 5 minutes. Conclusion: The proposed method showed linearity, accuracy, precision, specificity, robustness, solution stability, and system suitability results within the acceptance criteria.

scholarly journals Biofoam of Spittlebug, Poophilus costalis (Walker): Preferential Sites, Temperature Regulation, Chemical Composition and Antimicrobial Activity

Insects ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 340
Author(s):  
Kitherian Sahayaraj ◽  
Balakrishnan Saranya ◽  
Samy Sayed ◽  
Loko Yêyinou Laura Estelle ◽  
Koilraj Madasamy
Keyword(s):  
Antimicrobial Activity ◽  
Chemical Composition ◽  
High Performance ◽  
Host Plants ◽  
Ground Level ◽  
College Campus ◽  
The Other ◽  
Mimosa Pudica ◽  
Ft Ir ◽  
Gas Chromatography Mass Spectroscopy

The foam produced by nymphs of Poophilus costalis on eleven different host plants belonging to eight families on St. Xavier’s College campus in India was studied over five months. The chemical composition and antimicrobial activity of these biofoams were investigated. The results revealed that P. costalis preferred Theporsia purpurea and Mimosa pudica for laying their eggs and producing foam, over the other tested plants. P. costalis produce their foam on either nodes or internodes on monocotyledons (30%) (p < 0.05), whereas on dicotyledons, they produce more foam on the stems (63.8%) than on the leaves (6.2%) (p < 0.01). The number of nymphs in each piece of foam from P. costalis varied from 1 to 3 (mean = 1.8 per plant). They produced their foam (5.7 to 45.2 cm) from the ground level on a plant. The length and breadth of a piece of foam ranged from 1.0 to 3.9 cm and 0.6 to 4.7 cm, respectively. The foam tended to be cooler than the environment. Qualitative profiling showed that the foam consists of carbohydrates, including maltose; trypsin; amino acids; protease. The foam was also analyzed using a spectrophotometer, Fourier transform infrared spectroscopy (FT-IR), gas chromatography–mass spectroscopy (GC-MS), and high-performance liquid chromatography (HPLC). The antimicrobial activity of the biofoam was the greatest against Staphylococcus aureus, the growth of which was reduced by 55.9 ± 3.9%, suggesting that the foam could be used as an antimicrobial product. However, no activities were observed against Fusarium oxysporum and Candida albicans.

Expansion of Nanosized MgSiO3/Chitosan Nanocomposite Structural and Spectroscopic for Loading Velosef by Nanomaterial Intervention

2021 ◽  
Author(s):  
amal aboelnaga ◽  
talaat Meaz ◽  
amany M elnahrawy
Keyword(s):  
Antimicrobial Activity ◽  
High Performance ◽  
Sol Gel ◽  
Polymerization Process ◽  
Absorption Bands ◽  
Structural Morphology ◽  
Crystallinity Degree ◽  
Chitosan Matrix ◽  
Antimicrobial Studies ◽  
Sol Gel Process

Abstract The aim of this study is to investigate the effect of different doses of Velosef in magnesium silica/chitosan nanocomposite in terms of structural, morphology, optical properties, and bioactivity. Loading Velosef in fine-sized magnesium silica/chitosan is an efficient engineering approach for drug delivery. The sol-gel process was used to prepare magnesium silica fine-sized before being blended into chitosan matrix, which acts as a potential morphogenetic biomaterial. The Velosef/magnesium silica/chitosan nanocomposites were characterized by XRD, TEM, SEM, FTIR, UV-absorption, and antimicrobial studies. The XRD was characteristic of the crystallinity degree of the MgO-SiO2/chitosan/Velosef nanocomposites with three maximum peaks at 26.37°, 33.34o, 36.9°. FTIR results indicated the structural change occurred with the Velosef sol-gel polymerization process. UV-absorbance reveals that the MgO-SiO2/chitosan nanocomposite appeared a high performance for loading Velosef at two absorption bands at 253 and 347 nm. The MgO-SiO2/Chitosan/Velosef nanocomposites showed considerable antimicrobial activity in opposition to the tested representative microorganisms. The maximum antimicrobial activity was obtained with MgO-SiO2/Chitosan against both Escherichia coli and Candida albicans (37 mm), while the minimum antimicrobial activity (30 mm) was recorded against B. mycoides and E. coli with control.

A redox mediator doped gel polymer as an electrolyte and separator for a high performance solid state supercapacitor

2015 ◽  
Vol 3 (7) ◽  
pp. 4035-4041 ◽  
Author(s):  
Guofu Ma ◽  
Miaomiao Dong ◽  
Kanjun Sun ◽  
Enke Feng ◽  
Hui Peng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Sulfuric Acid ◽  
Solid State ◽  
Polyvinyl Alcohol ◽  
High Performance ◽  
Indigo Carmine ◽  
Polymer System ◽  
Redox Mediator ◽  
Gel Electrolyte

A stable and effective redox-mediator gel electrolyte has been prepared by doping indigo carmine (IC) into a polyvinyl alcohol sulfuric acid polymer system (PVA–H2SO4), and a high performance solid state supercapacitor is fabricated by utilizing activated carbon as electrodes and the prepared gel polymer (PVA–H2SO4–IC) as an electrolyte and separator.

Fabrication of co‐PVDF /modacrylic/ SiO 2 nanofibrous membrane: Composite separator for safe and high performance lithium‐ion batteries

2020 ◽  
Vol 138 (7) ◽  
pp. 49835
Author(s):  
Adel Al Rai ◽  
Elena Stojanovska ◽  
Yasin Akgul ◽  
Mohammad Mansoob Khan ◽  
Ali Kilic ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Nanofibrous Membrane ◽  
Composite Separator

scholarly journals Electrospun Polytetrafluoroethylene Nanofibrous Membrane for High-Performance Self-Powered Sensors

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Shizhe Lin ◽  
Yongliang Cheng ◽  
Xiwei Mo ◽  
Shuwen Chen ◽  
Zisheng Xu ◽  
...  
Keyword(s):  
High Performance ◽  
Nanofibrous Membrane ◽  
Self Powered

scholarly journals Analysis of aristolochlic acids and evaluation of antibacterial activity of Aristolochia clematitis L.

2019 ◽  
Vol 70 (4) ◽  
pp. 323-329 ◽  
Author(s):  
Gergely Sámuel Bartha ◽  
Gergő Tóth ◽  
Péter Horváth ◽  
Eszter Kiss ◽  
Nóra Papp ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Antibacterial Activity ◽  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Antimicrobial Effect ◽  
Aristolochic Acids ◽  
Microdilution Method ◽  
Stem Leaf ◽  
Ethyl Acetate Extracts

Introduction Several Aristolochia species were used as medicinal herb across Europe and in recent years, their antimicrobial activity has also been investigated. Materials and methods In this study, A. clematitis was selected to evaluate the aristolochic acids I and II (AA I and AA II) concentrations and the antimicrobial activity of methanol, hexane, butanol, and ethyl acetate extracts of the root, stem, leaf, root, and fruit. AA I and AA II contents were measured by a validated high-performance liquid chromatography–ultraviolet method. Results Each fraction of the plant contained AA I and AA II and the root was found to have the highest contents of AA I (1.09%) and AA II (0.7454%). The minimum inhibitory concentrations of all extracts were determined by standard microdilution method. The fruit’s extracts showed the most efficient antimicrobial effect against both methicillin sensitive and resistant Staphylococcus aureus strains. Conclusion Correlation between the AA I and AA II concentrations and the antimicrobial effect was not found.

A super-hydrophobic and electrically conductive nanofibrous membrane for a chemical vapor sensor

2018 ◽  
Vol 6 (21) ◽  
pp. 10036-10047 ◽  
Author(s):  
Jiefeng Gao ◽  
Hao Wang ◽  
Xuewu Huang ◽  
Mingjun Hu ◽  
Huaiguo Xue ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Vapor ◽  
Nanofibrous Membrane ◽  
Electrically Conductive ◽  
Vapor Sensors ◽  
Vapor Sensor ◽  
Chemical Vapor Sensor

A superhydrophobic and electrically conductive blend nanofibrous membrane was prepared for high performance chemical vapor sensors.

Sign in / Sign up

Export Citation Format

Share Document