Journal of Analytical Science and Technology

http://link.springer.com/journal/40543

List of Papers (Total 139)

Material structure, properties, and dynamics through scanning transmission electron microscopy

Scanning transmission electron microscopy (STEM) has advanced rapidly in the last decade thanks to the ability to correct the major aberrations of the probe-forming lens. Now, atomic-sized beams are routine, even at accelerating voltages as low as 40 kV, allowing knock-on damage to be minimized in beam sensitive materials. The aberration-corrected probes can contain sufficient...

HPLC-CUPRAC post-column derivatization method for the determination of antioxidants: a performance comparison between porous silica and core-shell column packing

Background An HPLC method employing a post-column derivatization strategy using the cupric reducing antioxidant capacity reagent (CUPRAC reagent) for the determining antioxidants in plant-based materials leverages the separation capability of regular HPLC approaches while allowing for detection specificity for antioxidants. Methods Three different column types, namely core-shell...

An optical sensor for selenite determination in aqueous samples

Background In the present work, an optical sensor has been developed for the determination of selenium (IV) in aqueous samples. The optical sensor is a cellulose triacetate plasticized membrane with tri-octyl methyl ammonium chloride (Al-336) immobilized in it as an ion exchanger. Methods The sensor works in two steps. In the first step, a 1 × 2 cm piece of the membrane is...

A novel X-ray radiography approach for the characterization of granular activated carbons used in the rum production

Background X-ray methods have proven to be reliable, accurate and sensitive techniques to study activated carbons in order to define its porous structure and functionality groups. Methods For the first time, the characterization of the exhaustion level of granular activated carbon (GAC) used in rum production applying methods based on X-ray technology has been explored. In this...

Kinetic and thermodynamic studies for fluoride removal using a novel bio-adsorbent from possotia (Vitex negundo) leaf

Background Possotia leaf powder (PLP), a novel biosorbent obtained from a locally available wild plant with environment friendly and low cost nature, has found to be effective to remove fluoride from fluoride contaminated drinking water. Methods The kinetic and thermodynamic parameters for the adsorption have been studied. Its fluorideabsorption efficiency is found to be nearly...

Comparative verification study of silica gel-coated TLC and HPTLC plates’ performances in separation of opium alkaloids on the basis of their physicochemical properties

Background Thin layer chromatography (TLC) has been a conventional analytical method which is currently used for separation and detection of drugs in biological and non-biological samples. High-performance thin layer chromatography (HPTLC) has been claimed to have several advantages over TLC due to its smaller adsorbent particle size. Opium is the dried latex obtained from the...

Application of DRIFT-FTIR spectroscopy for quantitative prediction of simple sugars in two local and two Floridian mango (Mangifera indica L.) cultivars in Kenya

Background Mangoes are fruits of nutritional importance in Kenya. The fruits vary in their sugars depending on cultivar type and ripening stage. Current methods of sugar content analysis are based on HPLC methods, which are accurate but expensive and time-consuming. We evaluated the potential of diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy as a rapid tool...

Analysis of organic acids of tricarboxylic acid cycle in plants using GC-MS, and system modeling

Background Leaves of 15 plant species were collected from the catchment areas of the river Beas, Punjab, India, and analyzed for organic acids of tricarboxylic acid cycle, viz., citric acid (CA), succinic acid (SA), fumaric acid (FmA), and malic acid (MA). Methods Gas chromatography-mass spectrometry (GC-MS) was used to determine the content of organic acids in the leaves of...

Detection of cathinone and mephedrone in plasma by LC-MS/MS using standard addition quantification technique

Background Cathinones better known as bath salts have been listed as illicit drugs since 2011. Few studies have focused on the analytical extraction techniques and the matrix effect affecting their detection and quantification in biological samples. Matrix suppression of the signal of cathinones has been previously observed in urine sample by LC-MS/MS. This study is aimed to use...

Effective separation of organic dyes using ionic liquids as green mobile phase and polyaniline-modified silica gel nanocomposite-based thin-layer chromatography

Background Organic dyes are used for a wide variety of purposes including their applications in textiles, foods, printing cosmetics and pharmaceuticals. Thus, these are industrially very important and their analysis is always required before putting to particular use. Methods To develop the extremely efficient thin layer chromatographic system for the resolution of co-existing...

Determining detection limits of aqueous anions using electrochemical impedance spectroscopy

Background Pulsed amperometric detection is a relatively new method for detection of ions and especially non-electrolytes such as carbohydrates in aqueous solutions. Pulsed amperometric detection relies on a redox reaction while electrochemical impedance simply measures the real and capacitive resistant of the solution. There is a correlation between the real impedance of a...

Advances in monolithic silica columns for high-performance liquid chromatography

In a monolithic column stationary phase contains a continuous porous material, sealed against the wall of a tube, instead of beads. Due to the decrease in chemical usage, sample usage, improved sensitivity, reusable frit-less columns and less back pressure monolithic column are very popular in the field of capillary electrochromatography (CEC). This review attempts to give an...

Development and validation of a GF-AAS method and its application for the trace level determination of Pb, Cd, and Cr in fish feed samples commonly used in the hatcheries of Bangladesh

Background A sensitive, accurate and precise method was developed and validated in regard to Council Directive 333/2007/EC, Commission Decision 657/2002/EC, ISO/IEC 17025:2005 and EURACHEM 1998 for the trace level determination of Lead (Pb), Cadmium (Cd) and Chromium (Cr) in fish feed samples using Graphite Furnace Atomic Absorption Spectrometry (GF-AAS). Methods For method...

Gold nanoparticle-based sensing platform of hydrazine, sulfite, and nitrite for food safety and environmental monitoring

Background A facile and sensitive electrochemical sensor platform has been explored based on gold nanoparticles (Au NPs) dispersed in amine-functionalized three-dimensional (3D) silicate sol–gel network for ((aminopropyl)triethoxysilane (APS)-Au NPs) for multi-analytes such as hydrazine, sulfite, and nitrite. Methods Au NPs dispersed silicate network was prepared via a single...

Microwave-irradiated green synthesis of gold nanoparticles for catalytic and anti-bacterial activity

BackgroundHerein, we report a green, microwave irradiated synthesis of gold nanoparticles by using a simple, low cost and ecofriendly technique. The green technique has been developed for the synthesis of gold nanoparticles (AuNPs) from HAuCl4 using papaya leaf extract. The papaya leaf extract served both as a reductant and a stabilizer.MethodThe synthesized AuNPs had been...

Evaluation and statistical analysis of the modified QuEChERS method for the extraction of pinoxaden from environmental and agricultural samples

Background Green chemistry focuses on an efficient extraction strategy for pesticides from agricultural and environmental samples. QuEChERS (quick, easy, cheap, effective, rugged, and safe) method is used primarily, in the extraction of pesticides from food matrices. Certain modifications in the approach lead to better sensitivity and efficient extraction. This paper describes an...

Chemical composition analysis of the essential oil of Mentha piperita L. from Kermanshah, Iran by hydrodistillation and HS/SPME methods

Background The volatile constituents from the aerial parts of Mentha piperita L. (peppermint) which were collected from cultivate growing plants in Kermanshah (Garreban; at the east of Kermanshah City) of Iran were extracted by hydrodistillation and headspace/solid-phase micro-extraction (HS/SPME) methods and were analyzed by gas chromatography (GC) and gas chromatography/mass...

Human UDP-glucuronosyltransferase UGT1A4 forms tertiary N-glucuronides predominately with the energetically less favored tautomer of substituted 1H-indazole (benzpyrazole)

Background Human UDP-glucuronosyltransferase UGT1A4 is reported to convert a range of tertiary amine substrates to the respective quaternary glucuronides. In this study, we report on the in vitro glucuronidation of a substituted 1H-indazole (benzpyrazole), a transient receptor potential ankyrin 1 antagonist. Methods Depending on the mammalian liver used for production, two peaks...

Parametric optimization of microwave reflux extraction of spice oleoresin from white pepper (Piper nigrum)

Background White Piper nigrum is an important commodity crop containing a number of essential bioactive components with nutritional and medicinal properties when sufficiently extracted. Microwave refluxation is therefore a novel technique employed in the extraction of bioactive components from natural products of plant origin. This method doubled as classical and traditional...

A study on leakage current and electrical properties of oleic acid-coated cobalt-doped Mn-Zn ferrite nanocrystalline powders

Background Mn-Zn ferrites have drawn a continuously an increasing interest because of their potential applications as multifunctional devices. These materials simultaneously exhibit ferroelectricity and ferromagnetism. The dielectric and leakage current properties of Cobalt substituted Mn-Zn ferrites coated with oleic acid were not reported. Methods This paper presents the...

Thiosemicarbazide derivative-functionalized carbon nanotube for simultaneous determination of isoprenaline and piroxicam

Background Piroxicam (PX) is a nonsteroidal anti-inflammatory drug of the oxicam category that has been known worth as a chemopreventative, anti-tumor agent, for acute and chronic musculoskeletal. To the best of our knowledge, no paper has been published until now reporting the simultaneous electrocatalytic detection of isoprenaline and PX by using any type of modified electrodes...