scholarly journals Kinetics of the Cationic bio-reduction involved in the biosynthesis of silver nanoparticles from Leea Coccinea Leaves

2021 ◽  
Author(s):  
María del Carmen Travieso Novelles ◽  
Lianet Díaz Pérez ◽  
Annie Rubio Ortega ◽  
Beatriz Alvarez Pita ◽  
Verónica Navarro Hernández ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Spectroscopic Method ◽  
Kinetic Studies ◽  
Cost Effective ◽  
Operational Parameters ◽  
Dynamic Light Scattering Technique ◽  
And Performance ◽  
Parallel Reactions ◽  
Kinetics Of

Abstract The resistance of microorganisms to conventional antimicrobials is one of the most serious health problems that affect not only the human, but also animals and plants, making the search for antimicrobial active ingredients a priority of global research. Green synthesis of antimicrobial silver nanoparticles (AgNPs) is a simple, cost-effective, rapid, reproducible, and environment friendly alternative for which numerous plant species have been reported for this purpose. Previous studies have shown the potential of Leea coccinea leaves in to the biosynthesis of antimicrobial silver nanoparticles. The current research aimed to study the kinetics of the reaction of synthesis of AgNPs by cationic bio-reduction from this botanical bioresource. A technology for the synthesis of AgNPs was established and the influence of operational parameters such as the bio-reduction conditions and the kinetics of the reaction were studied. AgNPs were characterized at different times by UV-VIS spectroscopic method, scanning electron microscopy, determination of particle size, and Z potential through Dynamic Light Scattering technique (DLS). Addition of tensoactive substances was evaluated for the stabilization of the suspension of nanoparticles. The results showed that spherical AgNPs smaller than 100 nm were obtained, which were visually identified by the formation of a dark brown complex with maximum absorption at 470 nm. Kinetic studies demonstrated the influence of the initial plant material on speed and performance, making evident a complex phenomenology with the possible occurrence of parallel reactions, which points to the possible reaction of different reducing compounds contained in this natural source. Addition of surface agents, such as SDS (0,5 %) or maltose (0,5 %), improved the stabilization in the aqueous medium, suggesting the continuation of studies to develop pharmaceuticals formulations based on AgNPs.

Digital videometrics analysis for the kinetic determination of dopamine in the presence of ascorbic acid based on the formation of silver nanoparticles

2015 ◽  
Vol 7 (15) ◽  
pp. 6318-6324 ◽  
Author(s):  
Bahram Hemmateenejad ◽  
Fatemeh Shakerizadeh-Shirazi ◽  
Sahar Heidari ◽  
Arezoo Shahrivar-kevishahi
Keyword(s):  
Silver Nanoparticles ◽  
Ascorbic Acid ◽  
Image Analysis ◽  
Rapid Method ◽  
Visual Detection ◽  
Cost Effective ◽  
Video Image ◽  
Kinetic Determination ◽  
Video Image Analysis

A simple, cost-effective and rapid method for the visual detection of dopamine (DA) and ascorbic acid (AsA) based on the video-image analysis has been developed.

A simple spectroscopic method for the determination of the release kinetics of drugs from PHB

2020 ◽  
Vol 81 ◽  
pp. 106269
Author(s):  
Péter Polyák ◽  
Dániel Mirkó Tilinger ◽  
Béla Pukánszky
Keyword(s):  
Release Kinetics ◽  
Spectroscopic Method ◽  
Kinetics Of

Fabrication of Soft and Stretchable Electronics Through Integration of Printed Silver Nanoparticles and Liquid Metal Alloy

2018 ◽  
Author(s):  
Mahmoud Tavakoli ◽  
Mohammad H. Malakooti ◽  
Hugo Paisana ◽  
Yunsik Ohm ◽  
Daniel Green Marques ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Silver Nanoparticles ◽  
Liquid Metal ◽  
Liquid Metals ◽  
High Surface ◽  
Cost Effective ◽  
Stretchable Electronics ◽  
Liquid Metal Alloy ◽  
And Performance ◽  
Complex Circuits

Liquid metal (LM) alloys such as eutectic gallium indium (EGaIn) and gallium-indium-tin (Galinstan) have been used in the fabrication of soft and stretchable electronics during the past several years. The liquid-phase and high electrical conductivity of these materials make them one of the best candidates for fabrication of deformable electronics and multifunctional material systems. While liquid metals are highly reliable for fabrication of simple circuits and stretchable microfluidic devices, their application for producing complex circuits faces fabrication challenges due to their high surface tension and surface oxidization. In this study, we propose a scalable, cost-effective, and versatile technique to print complex circuits using silver nanoparticles and transform them into stretchable electronics by incorporating eutectic gallium indium alloys to the circuit. As a result, the deposited liquid metal considerably increases the electrical conductivity and stretchability of the fabricated electronics. The reliability and performance of these stretchable conductors are demonstrated by studying their electromechanical behavior and integrating them into skin-like electronics, termed electronic tattoos.

Determination of ferric ions using surface-enhanced Raman scattering based on desferrioxamine-functionalized silver nanoparticles

2013 ◽  
Vol 49 (72) ◽  
pp. 7962-7964 ◽  
Author(s):  
Fei Yan ◽  
Yam K. Shrestha ◽  
Charina L. Spurgeon
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Aqueous Solutions ◽  
Spectroscopic Method ◽  
Surface Enhanced Raman Scattering ◽  
Ferric Ions ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A simple, robust and reproducible spectroscopic method based on surface-enhanced Raman scattering with nanomolar sensitivity has been developed for selective iron(iii) determination in aqueous solutions.

UV spectroscopic method for determination of phenytoin in bulk and injection forms

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Quality Control ◽  
Spectrophotometric Method ◽  
Spectroscopic Method ◽  
Ich Guidelines ◽  
Precision And Accuracy ◽  
Routine Quality Control

Recent study was conducted to develop a simple UV spectrophotometric method to determine Phenytoin in bulk and injection form according to official requirement and validate as per ICH guidelines. λmax of Phenytoin was found 202 nm. Linearity existed perceived in the concentration assortment 2-8 μg/ml (r2 = 0.999) for the method. The method was validated pertaining to linearity, precision and accuracy studies, LOD and LOQ consistent with ICH guidelines. The existent method was establish to be simple, linear, precise, accurate as well as sensitive and can be applied for routine quality control enquiry for the analysis of Phenytoin in bulk and injection form.

The Frequency of Occurrence of Handwriting Performance Features Used to Predict Whether Questioned Signatures are Simulated

2018 ◽  
Vol 28 ◽  
pp. 35-42
Author(s):  
David Black ◽  
Bryan Found ◽  
Doug Rogers
Keyword(s):  
Large Population ◽  
Quality Parameters ◽  
Frequency Of Occurrence ◽  
Relative Speed ◽  
Simulation Process ◽  
Spatial Features ◽  
And Performance ◽  
Document Examiners ◽  
Line Trace

Forensic Document Examiners (FDEs) examine the physical morphology and performance attributes of a line trace when comparing questioned to specimen handwriting samples for the purpose of determining authorship. Along with spatial features, the elements of execution of the handwriting are thought to provide information as to whether or not a questioned sample is the product of a disguise or simulation process. Line features such as tremor, pen-lifts, blunt beginning and terminating strokes, indicators of relative speed, splicing and touch ups, are subjectively assessed and used in comparisons by FDEs and can contribute to the formation of an opinion as to the validity of a questioned sample of handwriting or signatures. In spite of the routine use of features such as these, there is little information available regarding the relative frequency of occurrence of these features in populations of disguised and simulated samples when compared to a large population of a single individual’s signature. This study describes a survey of the occurrence of these features in 46 disguised signatures, 620 simulated signatures (produced by 31 different amateur forgers) and 177 genuine signatures. It was found that the presence of splices and touch-ups were particularly good predictors of the simulation process and that all line quality parameters were potentially useful contributors in the determination of the authenticity of questioned signatures. Purchase Article - $10

Determination of microbiological activity during the processing of frost damaged sugar beets

2014 ◽  
pp. 228-231 ◽  
Author(s):  
Maciej Wojtczak ◽  
Aneta Antczak-Chrobot ◽  
Edyta Chmal-Fudali ◽  
Agnieszka Papiewska
Keyword(s):  
Sugar Beet ◽  
Microbiological Activity ◽  
Microbiological Contamination ◽  
Sugar Beets ◽  
Bacterial Metabolites ◽  
Kinetics Of

The aim of the study is to evaluate the kinetics of the synthesis of dextran and other bacterial metabolites as markers of microbiological contamination of sugar beet.

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