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Analytical Chemistry Insights

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https://www.readbyqxmd.com/read/30013309/in-vitro-studies-of-the-antimicrobial-and-free-radical-scavenging-potentials-of-silver-nanoparticles-biosynthesized-from-the-extract-of-desmostachya-bipinnata
#1
Sitaramanjaneya Reddy Guntur, Ns Sampath Kumar, Manasa M Hegde, Vijaya R Dirisala
The aim of this study was to perform green synthesis of silver nanoparticles (AgNPs) from the leaf extract of Desmostachya bipinnata (Dharba), a medicinally important herb which is widely used across India. Synthesized AgNPs were analyzed by UV-Visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDAX). The results have confirmed that green synthesis of AgNPs leads to the fabrication of sphere-shaped particles with a diameter of 53 nm...
2018: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/29887729/analytical-methods-for-the-determination-of-mineral-oil-saturated-hydrocarbons-mosh-and-mineral-oil-aromatic-hydrocarbons-moah-a-short-review
#2
REVIEW
Sandra Weber, Karola Schrag, Gerd Mildau, Thomas Kuballa, Stephan G Walch, Dirk W Lachenmeier
Mineral oils (such as paraffinum liquidum or white oil), which consist of mineral oil saturated hydrocarbons (MOSH) and mineral oil aromatic hydrocarbons (MOAH), are widely applied in various consumer products such as medicines and cosmetics. Contamination of food with mineral oil may occur by migration of mineral oil containing products from packaging materials, or during the food production process, as well as by environmental contamination during agricultural production. Considerable analytical interest was initiated by the potential adverse health effects, especially carcinogenic effects of some aromatic hydrocarbons...
2018: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/29593375/chitosan-membrane-embedded-with-zno-cuo-nanocomposites-for-the-photodegradation-of-fast-green-dye-under-artificial-and-solar-irradiation
#3
Eman Alzahrani
Fast Green (FCF) dye is commonly used in both cytology and histology applications. Previous studies have found that it can cause mutagenic and tumorigenic effects in experimental human and animal populations. It can also be a source of skin, eye, respiratory, and digestive irritation. The purpose of this study was to examine the use of thin film membranes to degrade FCF. A thin film membrane of chitosan (CS) was fabricated and subsequently filled with zinc oxide nanoparticles (ZnO) or ZnO/CuO-heterostructured nanocomposites...
2018: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/29467569/ten-basic-rules-of-antibody-validation
#4
REVIEW
Michael G Weller
The quality of research antibodies is an issue for decades. Although several papers have been published to improve the situation, their impact seems to be limited. This publication makes the effort to simplify the description of validation criteria in a way that the occasional antibody user is able to assess the validation level of an immunochemical reagent. A simple, 1-page checklist is supplied for the practical application of these criteria.
2018: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/28890655/comparison-of-3-derivatization-methods-for-the-analysis-of-amphetamine-related-drugs-in-oral-fluid-by-gas-chromatography-mass-spectrometry
#5
Khaled M Mohamed, Abdulsallam Bakdash
The heptafluorobutyric anhydride (HFBA), pentafluoropropionic anhydride (PFPA), and trifluoroacetic anhydride (TFAA) are compared as derivatizing reagents to use as the optimal method for the analysis of 10 amphetamines and cathinones in oral fluid. The target compounds were amphetamine (AMP), methamphetamine (MA), 4-methylamphetamine, 3,4-methylenedioxyamphetamine (MDA), 3,4-methylenedioxymethamphetamine (MDMA), 3,4-methylenedioxy-N-ethylamphetamine (MDEA), cathinone (CAT), methcathinone, mephedrone, and ephedrine...
2017: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/28874884/quality-by-design-applied-liquid-chromatography-tandem-mass-spectrometry-determination-of-enzalutamide-anti-prostate-cancer-therapy-drug-in-spiked-plasma-samples
#6
Ask Sankar, Shanmugasundaram Palani, Ravichandiran Velayudham
This research article presents the Quality by Design (QbD)-finalised conditions for a method that uses liquid chromatography-tandem mass spectrometry for the determination of concentration of enzalutamide (ENZ), an atypical anticancer drug, in a drug formulation and in spiked plasma samples. Critical process attributes (CPA) considered to be the influential parameters in separation, identification, and quantification processes by ultrahigh-performance liquid chromatography-electrospray ionisation-tandem mass spectrometry (UHPLC-ESI-MS/MS) were organic content, buffer strength, pH modifier, flow rate, spray voltage, sheath gas, and auxiliary gas that alter critical analytical attributes, such as retention time (R1) and area (R2)...
2017: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/28607539/synthesis-and-optical-properties-of-pentamethine-cyanine-dyes-with-carboxylic-acid-moieties
#7
Tyler L Dost, Michael T Gressel, Maged Henary
Cyanine dyes possessing carboxylic acid groups have been used in many different fields of study. The acid groups can act as handles for bioconjugation or as metal chelators. Several pentamethine cyanine dyes with propionic acid handles were synthesized and their optical properties were studied to determine their usefulness as fluorescent probes. The optical properties studies performed include the absorbance and emission maxima values as well as the calculation of quantum yield and molecular brightness levels...
2017: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/28469407/analytical-method-validation-of-high-performance-liquid-chromatography-and-stability-indicating-study-of-medroxyprogesterone-acetate-intravaginal-sponges
#8
Nidal Batrawi, Shorouq Wahdan, Murad Abualhasan
Medroxyprogesterone acetate is widely used in veterinary medicine as intravaginal dosage for the synchronization of breeding cycle in ewes and goats. The main goal of this study was to develop reverse-phase high-performance liquid chromatography method for the quantification of medroxyprogesterone acetate in veterinary vaginal sponges. A single high-performance liquid chromatography/UV isocratic run was used for the analytical assay of the active ingredient medroxyprogesterone. The chromatographic system consisted of a reverse-phase C18 column as the stationary phase and a mixture of 60% acetonitrile and 40% potassium dihydrogen phosphate buffer as the mobile phase; the pH was adjusted to 5...
2017: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/28469406/review-of-current-applications-of-immunohistochemistry-in-pediatric-nonneoplastic-gastrointestinal-hepatobiliary-and-pancreatic-lesions
#9
REVIEW
Joseph de Nanassy, Dina El Demellawy
Immunohistochemical (IHC) stains are widely used by pathologists for a variety of considerations in the diagnostic workup of pediatric nonneoplastic lesions in gastrointestinal (GI), hepatic, biliary, and pancreatic lesions. The pathologic changes cover a wide range and types of presentations, including inflammatory (bacterial and viral), metaplastic, posttransplant lymphoproliferative, autoimmune, metabolic, degenerative, developmental, and genetic conditions, among others. The everyday practical value of IHC stains covers primary identification, confirmation, differential, and/or exclusionary roles in the hands and eyes and minds of the practitioners...
2017: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/28469405/colorimetric-detection-based-on-localised-surface-plasmon-resonance-optical-characteristics-for-the-detection-of-hydrogen-peroxide-using-acacia-gum-stabilised-silver-nanoparticles
#10
Eman Alzahrani
The use of nanoparticles in sensing is attracting the interest of many researchers. The aim of this work was to fabricate Acacia gum-stabilised silver nanoparticles (SNPs) using green chemistry to use them as a highly sensitive and cost-effective localised surface plasmon resonance (LSPR) colorimeter sensor for the determination of reactive oxygen species, such as hydrogen peroxide (H2O2). Silver nanoparticles were fabricated by the reduction of an inorganic precursor silver nitrate solution (AgNO3) using white sugar as the reducing reagent and Acacia gum as the stabilising reagent and a sonication bath to form uniform silver nanoparticles...
2017: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/27721652/insight-into-biochemical-characterization-of-plant-sesquiterpene-synthases
#11
Tom Manczak, Henrik Toft Simonsen
A fast and reproducible protocol was established for enzymatic characterization of plant sesquiterpene synthases that can incorporate radioactivity in their products. The method utilizes the 96-well format in conjunction with cluster tubes and enables processing of >200 samples a day. Along with reduced reagent usage, it allows further reduction in the use of radioactive isotopes and flammable organic solvents. The sesquiterpene synthases previously characterized were expressed in yeast, and the plant-derived Thapsia garganica kunzeaol synthase TgTPS2 was tested in this method...
2016: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/27660405/development-of-hollow-fiber-liquid-phase-microextraction-method-for-determination-of-urinary-trans-trans-muconic-acid-as-a-biomarker-of-benzene-exposure
#12
Farhad Ghamari, Abdulrahman Bahrami, Yadollah Yamini, Farshid Ghorbani Shahna, Abbas Moghimbeigi
For the first time, hollow-fiber liquid-phase microextraction combined with high-performance liquid chromatography-ultraviolet was used to extract trans,trans-muconic acid, in urine samples of workers who had been exposed to benzene. The parameters affecting the metabolite extraction were optimized as follows: the volume of sample solution was 11 mL with pH 2, liquid membrane containing dihexyl ether as the supporter, 15% (w/v) of trioctylphosphine oxide as the carrier, the time of extraction was 120 minutes, and stirring rate was 500 rpm...
2016: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/27625574/stability-indicating-high-performance-liquid-chromatography-assay-for-the-determination-of-sulthiame-in-pharmaceutical-dosage-forms
#13
Ammar Haidar, Sofiane Kabiche, Elyes Majoul, Issa-Bella Balde, Jean-Eudes Fontan, Salvatore Cisternino, Joël Schlatter
A stability-indicating assay by reversed-phase high performance liquid chromatography method was developed and validated for the determination of sulthiame (STM). The chromatographic separation was achieved on a reversed-phase NovaPack C18 column and an isocratic mobile phase consisting of deionized water:methanol (70:30, v/v). The flow rate was 1.0 mL/min (ultraviolet detection at 210 nm). The STM was separated within 2.83 min. The linearity of the method was demonstrated in the range of 20.0-200.0 μg/mL and a coefficient of determination of r (2) = 0...
2016: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/27547032/extraction-of-honey-polyphenols-method-development-and-evidence-of-cis-isomerization
#14
Thibaut Istasse, Nicolas Jacquet, Thomas Berchem, Eric Haubruge, Bach Kim Nguyen, Aurore Richel
Honey polyphenols have been studied with the objective of relating honeys to their floral sources. Initially synthesized by plant, these polyphenols can be found in the plant's nectar, which are collected by bees, which convert the nectar into honey. Consequently, polyphenols constitute minor components of honey. The development of a solid-phase extraction method for honey polyphenols is presented in this study. The technique employs Amberlite XAD-2 adsorbent and was tested on monofloral honeys from six different plants: acacia, chestnut, eucalyptus, thyme, sunflower, and wild carrot...
2016: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/27279733/on-the-conflicting-estimations-of-pigment-site-energies-in-photosynthetic-complexes-a-case-study-of-the-cp47-complex
#15
REVIEW
Tonu Reinot, Jinhai Chen, Adam Kell, Mahboobe Jassas, Kevin C Robben, Valter Zazubovich, Ryszard Jankowiak
We focus on problems with elucidation of site energies [Formula: see text] for photosynthetic complexes (PSCs) in order to raise some genuine concern regarding the conflicting estimations propagating in the literature. As an example, we provide a stern assessment of the site energies extracted from fits to optical spectra of the widely studied CP47 antenna complex of photosystem II from spinach, though many general comments apply to other PSCs as well. Correct values of [Formula: see text] for chlorophyll (Chl) a in CP47 are essential for understanding its excitonic structure, population dynamics, and excitation energy pathway(s)...
2016: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/27081309/removal-of-4-nitrophenol-from-water-using-ag-n-p-tridoped-tio2-by-photocatalytic-oxidation-technique
#16
Temesgen Achamo, O P Yadav
Photocatalytic oxidation using semiconductor nanoparticles is an efficient, eco-friendly, and cost-effective process for the removal of organic pollutants, such as dyes, pesticides, phenols, and their derivatives in water. In the present study, nanosize Ag-N-P-tridoped titanium(IV) oxide (TiO2) was prepared by using sol-gel-synthesized Ag-doped TiO2 and soybean (Glycine max) or chickpea (Cicer arietinum) seeds as nonmetallic bioprecursors. As-synthesized photocatalysts were characterized using X-ray diffraction, Fourier transform infrared, and ultra violet (UV)-visible spectroscopic techniques...
2016: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/27013861/quality-issues-of-research-antibodies
#17
REVIEW
Michael G Weller
According to several recent studies, an unexpectedly high number of landmark papers seem to be not reproducible by independent laboratories. Nontherapeutic antibodies used for research, diagnostic, food analytical, environmental, and other purposes play a significant role in this matter. Although some papers have been published offering suggestions to improve the situation, they do not seem to be comprehensive enough to cover the full complexity of this issue. In addition, no obvious improvements could be noticed in the field as yet...
2016: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/26997866/development-and-validation-of-stability-indicating-rp-hplc-method-for-simultaneous-determination-of-metformin-hcl-and-glimepiride-in-fixed-dose-combination
#18
Pradnya N Vaingankar, Purnima D Amin
A simple reversed-phase high-performance liquid chromatography method was developed and validated for simultaneous determination of Metformin hydrochloride (MET) and Glimepiride (GLM) in combination and estimation of their principal degradation products. The separation was achieved using JASCO Finepak SIL (250 mm × 4.6 mm i.d. 5 μm) at ambient temperature. The optimized mobile phase composed of an aqueous phase (20 mM phosphate buffer, adjusted to pH 3.0) and an organic phase (methanol:acetonitrile; 62.5:37...
2016: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/26819548/electrochemical-behavior-and-voltammetric-determination-of-a-manganese-ii-complex-at-a-carbon-paste-electrode
#19
Sophia Karastogianni, Stella Girousi
Investigation of the electrochemical behavior using cyclic voltammetry and detection of [Mn(2+)(thiophenyl-2-carboxylic acid)2 (triethanolamine)] with adsorptive stripping differential pulse voltammetry. The electrochemical behavior of a manganese(II) complex [Mn(2+)(thiophenyl-2-carboxylic acid)2(triethanolamine)] (A) was investigated using cyclic and differential pulse voltammetry in an acetate buffer of pH 4.6 at a carbon paste electrode. Further, an oxidation-reduction mechanism was proposed. Meanwhile, an adsorptive stripping differential pulse voltammetric method was developed for the determination of manganese(II) complex...
2016: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/26715832/sample-preparation-of-eggs-from-laying-hens-using-quechers-dispersive-extraction-for-the-simultaneous-determination-of-melamine-and-cyromazine-residues-by-hplc-dad
#20
Niki Tsartsali, Victoria F Samanidou
A quick, easy, cheap, effective, rugged, and safe (QuEChERS) dispersive extraction method is proposed herein for the isolation and cleanup of melamine and cyromazine from chicken egg yolk. Analytes are determined by high-performance liquid chromatography using photodiode array detector after separation on a LiChroCART® (250 × 4 mm)-LiChrospher® RP-8e, 5 μm analytical column using a mobile phase of 0.1% trifluoracetic acid and methanol (80:20 v/v) delivered isocratically at a flow rate of 1 mL/minute. Extraction of isolated compounds was achieved by methanol and acetonitrile mixture (1:1 v/v)...
2015: Analytical Chemistry Insights
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