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International Journal of Analytical Chemistry

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https://www.readbyqxmd.com/read/29743890/rheological-behavior-of-tomato-fiber-suspensions-produced-by-high-shear-and-high-pressure-homogenization-and-their-application-in-tomato-products
#1
Yong Wang, Ping Sun, He Li, Benu P Adhikari, Dong Li
This study investigated the effects of high shear and high pressure homogenization on the rheological properties (steady shear viscosity, storage and loss modulus, and deformation) and homogeneity in tomato fiber suspensions. The tomato fiber suspensions at different concentrations (0.1%-1%, w/w) were subjected to high shear and high pressure homogenization and the morphology (distribution of fiber particles), rheological properties, and color parameters of the homogenized suspensions were measured. The homogenized suspensions were significantly more uniform compared to unhomogenized suspension...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29707002/determination-of-pyrethroids-in-tea-brew-by-gc-ms-combined-with-spme-with-multiwalled-carbon-nanotube-coated-fiber
#2
Dongxia Ren, Chengjun Sun, Guanqun Ma, Danni Yang, Chen Zhou, Jiayu Xie, Yongxin Li
A new method has been developed to simultaneously determine 7 pyrethroid residues in tea brew using gas chromatography-mass spectrometry (GC-MS) combined with solid phase microextraction (SPME) with multiwalled carbon nanotubes (MWCNTs) coated fiber. The MWCNTs coated fiber of SPME was homemade by using stainless steel wire as coating carrier and polyacrylonitrile (PAN) solution as adhesive glue. Under the optimized conditions, a good linearity was shown for bifenthrin, fenpropathrin, permethrin, and cyfluthrin in 1-50 ng mL-1 and for cypermethrin, fenvalerate, and deltamethrin in 5-50 ng mL-1 ...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29692811/antifungal-compound-isolated-from-catharanthus-roseus-l-pink-for-biological-control-of-root-rot-rubber-diseases
#3
R Zahari, N Halimoon, M F Ahmad, S K Ling
Rigidoporus microporus, Ganoderma philippii, and Phellinus noxius are root rot rubber diseases and these fungi should be kept under control with environmentally safe compounds from the plant sources. Thus, an antifungal compound isolated from Catharanthus roseus was screened for its effectiveness in controlling the growth of these fungi. The antifungal compound isolated from C. roseus extract was determined through thin layer chromatography (TLC) and nuclear magnetic resonance (NMR) analysis. Each C. roseus of the DCM extracts was marked as CRD1, CRD2, CRD3, CRD4, CRD5, CRD6, and CRD7, respectively...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29623092/a-data-mining-approach-to-improve-inorganic-characterization-of-amanita-ponderosa-mushrooms
#4
Cátia Salvador, M Rosário Martins, Henrique Vicente, A Teresa Caldeira
Amanita ponderosa are wild edible mushrooms that grow in some microclimates of Iberian Peninsula. Gastronomically this species is very relevant, due to not only the traditional consumption by the rural populations but also its commercial value in gourmet markets. Mineral characterisation of edible mushrooms is extremely important for certification and commercialization processes. In this study, we evaluate the inorganic composition of Amanita ponderosa fruiting bodies (Ca, K, Mg, Na, P, Ag, Al, Ba, Cd, Cr, Cu, Fe, Mn, Pb, and Zn) and their respective soil substrates from 24 different sampling sites of the southwest Iberian Peninsula (e...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29619049/the-effects-of-storage-conditions-on-lycopene-content-and-color-of-tomato-hot-pot-sauce
#5
He Li, Jian Zhang, Yong Wang, Jian Li, Yihe Yang, Xinqi Liu
Tomato hot pot sauce (THPS) at different storage temperatures (0, 25, and 37°C) and with two kinds of packaging for 120 days was investigated in this study. High performance liquid chromatography was employed for detecting lycopene and 5-hydroxymethylfurfural (HMF). The changes of lycopene and HMF during storage were regressed with kinetic equation of both zero-order and first-order models, and the latter fitted better. The kinetic equation constant ( k value) of lycopene or HMF at 37°C was higher than that at 25°C...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29581723/optimum-extraction-characterization-and-antioxidant-activities-of-polysaccharides-from-flowers-of-dendrobium-devonianum
#6
Donghui Wang, Bei Fan, Yan Wang, Lijing Zhang, Fengzhong Wang
Response surface methodology (RSM) was employed to optimize the conditions for the ultrasonic-assisted extraction (UAE) of polysaccharides from the flowers of Dendrobium devonianum . The optimal conditions for the maximum yields of DDFPs are as follows: an extraction temperature of 63.13°C, an extraction time of 53.10 min, and a water-to-raw material ratio of 22.11 mL/g. Furthermore, three fractions (DDFPs30, DDFPs50, and DDFPs70) were prepared from Dendrobium devonianum flowers polysaccharides (DDFPs) by the stepwise ethanol precipitation method...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29511379/characterization-of-fossil-and-renewable-fuels
#7
EDITORIAL
Xing Fan, Bo Chen, Xun Hu, Nilusha Sudasinghe, Ya-He Zhang
No abstract text is available yet for this article.
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29511378/simultaneous-determination-of-nitroimidazoles-and-quinolones-in-honey-by-modified-quechers-and-lc-ms-ms-analysis
#8
Haiyan Lei, Jianbo Guo, Zhuo Lv, Xiaohong Zhu, Xiaofeng Xue, Liming Wu, Wei Cao
This study reports an analytical method for the determination of nitroimidazole and quinolones in honey using liquid chromatography-tandem mass spectrometry (LC-MS/MS). A modified QuEChERS methodology was used to extract the analytes and determine veterinary drugs in honey by LC-MS/MS. The linear regression was excellent at the concentration levels of 1-100 ng/mL in the solution standard curve and the matrix standard curve. The recovery rates of nitroimidazole and quinolones were 4.4% to 59.1% and 9.8% to 46...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29487622/multivariate-analysis-of-fruit-antioxidant-activities-of-blackberry-treated-with-1-methylcyclopropene-or-vacuum-precooling
#9
Jian Li, Guowei Ma, Lin Ma, Xiaolin Bao, Liping Li, Qian Zhao, Yousheng Wang
Effects of 1-methylcyclopropene (1-MCP) and vacuum precooling on quality and antioxidant properties of blackberries ( Rubus spp.) were evaluated using one-way analysis of variance, principal component analysis (PCA), partial least squares (PLS), and path analysis. Results showed that the activities of antioxidant enzymes were enhanced by both 1-MCP treatment and vacuum precooling. PCA could discriminate 1-MCP treated fruit and the vacuum precooled fruit and showed that the radical-scavenging activities in vacuum precooled fruit were higher than those in 1-MCP treated fruit...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29487621/a-green-and-efficient-method-for-the-preconcentration-and-determination-of-gallic-acid-bergenin-quercitrin-and-embelin-from-ardisia-japonica-using-nononic-surfactant-genapol-x-080-as-the-extraction-solvent
#10
Ying Chen, Kunze Du, Jin Li, Yun Bai, Mingrui An, Zhijing Tan, Yan-Xu Chang
A simple cloud point preconcentration method was developed and validated for the determination of gallic acid, bergenin, quercitrin, and embelin in Ardisia japonica by high-performance liquid chromatography (HPLC) using ultrasonic assisted micellar extraction. Nonionic surfactant Genapol X-080 was selected as the extraction solvent. The effects of various experimental conditions such as the type and concentration of surfactant and salt, temperature, and solution pH on the extraction of these components were studied to optimize the conditions of Ardisia japonica ...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29445398/a-new-method-for-the-determination-of-sucrose-concentration-in-a-pure-and-impure-system-spectrophotometric-method
#11
A Borji, Fz Borji, A Jourani
Analytical chemistry is a set of procedures and techniques used to identify and quantify the composition of a sample of material. It is also focused on improvements in experimental design and the creation of new measurement tools. Analytical chemistry has broad applications to forensics, medicine, science, and engineering. The objective of this study is to develop a new method of sucrose dosage using a spectrophotometry method in a pure and impure system (presence of glucose and fructose). The work performed shows the reliability of this method...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29387086/analytical-strategies-involved-in-the-detailed-componential-characterization-of-biooil-produced-from-lignocellulosic-biomass
#12
REVIEW
Yao Lu, Guo-Sheng Li, Yong-Chao Lu, Xing Fan, Xian-Yong Wei
Elucidation of chemical composition of biooil is essentially important to evaluate the process of lignocellulosic biomass (LCBM) conversion and its upgrading and suggest proper value-added utilization like producing fuel and feedstock for fine chemicals. Although the main components of LCBM are cellulose, hemicelluloses, and lignin, the chemicals derived from LCBM differ significantly due to the various feedstock and methods used for the decomposition. Biooil, produced from pyrolysis of LCBM, contains hundreds of organic chemicals with various classes...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29387085/preparation-and-anticorrosion-of-octadecyl-trichlorosilane-sams-for-copper-surface
#13
Xue Shouqing, Liu Xiaohui
The self-assembled monolayer (SAM) was prepared using octadecyl trichlorosilane (OTS) in distilled solution on the copper surface. The effect of inhibitor concentration on the rate of inhibition efficiency and corrosion rate in corrosion medium on copper by using polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM) was studied. The results showed that OTS SAMs exhibit the better corrosion resistance; the corrosion potential of copper OTS SAMs protection increased by about 1...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29348752/infrared-drying-as-a-quick-preparation-method-for-dried-tangerine-peel
#14
Mingyue Xu, Guifang Tian, Chengying Zhao, Aftab Ahmad, Huijuan Zhang, Jinfeng Bi, Hang Xiao, Jinkai Zheng
To establish the most convenient and effective method to dry tangerine peels, different methods (sun drying, hot-air drying, freeze drying, vacuum drying, and medium- and short-wave infrared drying) were exploited. Our results indicated that medium- and short-wave infrared drying was the best method to preserve nutraceutical components; for example, vitamin C was raised to 6.77 mg/g (D.W.) from 3.39 mg/g (sun drying). Moreover, the drying time can be shortened above 96% compared with sun drying. Importantly, the efficiency of DPPH radical scavenging was enhanced from 26...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29348751/alkaloids-profiling-of-fumaria-capreolata-by-analytical-platforms-based-on-the-hyphenation-of-gas-chromatography-and-liquid-chromatography-with-quadrupole-time-of-flight-mass-spectrometry
#15
María Del Mar Contreras, Noureddine Bribi, Ana María Gómez-Caravaca, Julio Gálvez, Antonio Segura-Carretero
Two analytical platforms, gas chromatography (GC) coupled to quadrupole-time-of-flight (QTOF) mass spectrometry (MS) and reversed-phase ultrahigh performance liquid chromatography (UHPLC) coupled to diode array (DAD) and QTOF detection, were applied in order to study the alkaloid profile of Fumaria capreolata . The use of these mass analyzers enabled tentatively identifying the alkaloids by matching their accurate mass signals and suggested molecular formulae with those previously reported in libraries and databases...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29348750/recent-studies-on-the-speciation-and-determination-of-mercury-in-different-environmental-matrices-using-various-analytical-techniques
#16
REVIEW
Lakshmi Narayana Suvarapu, Sung-Ok Baek
This paper reviews the current research on the speciation and determination of mercury by various analytical techniques, including the atomic absorption spectrometry (AAS), voltammetry, inductively coupled plasma optical emission spectrometry (ICP-OES), ICP-mass spectrometry (MS), atomic fluorescence spectrometry (AFS), spectrophotometry, spectrofluorometry, and high performance liquid chromatography (HPLC). Approximately 96 research papers on the speciation and determination of mercury by various analytical instruments published in international journals since 2015 were reviewed...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29333162/a-multivariate-methodological-workflow-for-the-analysis-of-ftir-chemical-mapping-applied-on-historic-paint-stratigraphies
#17
Giorgia Sciutto, Paolo Oliveri, Silvia Prati, Emilio Catelli, Irene Bonacini, Rocco Mazzeo
In the field of applied researches in heritage science, the use of multivariate approach is still quite limited and often chemometric results obtained are often underinterpreted. Within this scenario, the present paper is aimed at disseminating the use of suitable multivariate methodologies and proposes a procedural workflow applied on a representative group of case studies, of considerable importance for conservation purposes, as a sort of guideline on the processing and on the interpretation of this FTIR data...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29333161/robustness-of-tomato-quality-evaluation-using-a-portable-vis-swnirs-for-dry-matter-and-colour
#18
U K Acharya, P P Subedi, K B Walsh
The utility of a handheld visible-short wave near infrared spectrophotometer utilising an interactance optical geometry was assessed in context of the noninvasive determination of intact tomato dry matter content, as an index of final ripe soluble solids content, and colouration, as an index of maturation to guide a decision to harvest. Partial least squares regression model robustness was demonstrated through the use of populations of different harvest dates or growing conditions for calibration and prediction...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29209369/detailed-componential-characterization-of-extractable-species-with-organic-solvents-from-wheat-straw
#19
Yong-Chao Lu, Yao Lu, Zhao-Lin Lu, Xian-Yong Wei
Componential analysis of extractives is important for better understanding the structure and utilization of biomass. In this investigation, wheat straw (WS) was extracted with petroleum ether (PE) and carbon disulfide (CS2 ) sequentially, to afford extractable fractions EFPE and EFCS2 , respectively. Detailed componential analyses of EFPE and EFCS2 were carried out with Fourier transform infrared (FTIR) spectroscopy, gas chromatography/mass spectrometry (GC/MS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy dispersive spectrometry (EDS), and electron probe microanalysis (EPMA)...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29201056/development-of-a-rapid-and-simple-method-to-remove-polyphenols-from-plant-extracts
#20
Imali Ranatunge, Subshini Adikary, Piumi Dasanayake, Chamira Dilanka Fernando, Preethi Soysa
Polyphenols are secondary metabolites of plants, which are responsible for prevention of many diseases. Polyvinylpolypyrrolidone (PVPP) has a high affinity towards polyphenols. This method involves the use of PVPP column to remove polyphenols under centrifugal force. Standards of gallic acid, epigallocatechin gallate, vanillin, and tea extracts (Camellia sinensis) were used in this study. PVPP powder was packed in a syringe with different quantities. The test samples were layered over the PVPP column and subjected to centrifugation...
2017: International Journal of Analytical Chemistry
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