Read by QxMD icon Read

Journal of AOAC International

Dasharath P Oulkar, Sandip Hingmire, Arnab Goon, Manjusha Jadhav, Bharat Ugare, Ahammed Shabeer Thekkumpurath, Kaushik Banerjee
A sensitive and accurate LC with tandem MS (MS/MS)-based method was developed and validated for the analysis of the herbicide glyphosate, its metabolite aminomethylphosphonic acid (AMPA), and glufosinate after derivatization with 9-fluorenylmethyl chloroformate (FMOC-Cl) in various plant matrixes. The method also covers direct analysis of the glufosinate metabolites 3-methylphosphinicopropionic acid (3-MPPA) and N-acetyl-glufosinate (NAG). The homogenized samples were extracted with 0.1% formic acid in water-dichloromethane (50 + 50)...
March 23, 2017: Journal of AOAC International
Vishal Mahale, Ajeet Singh, Gayatri S Phadke, Avinash D Ghanate, Dasharath P Oulkar, Kaushik Banerjee, Venkateswarlu Panchagnula
A chromatography-free atmospheric pressure matrix-assisted laser desorption/ionization high-resolution mass spectrometry (AP-MALDI HRMS) method is described for the simultaneous and quantitative detection of triazines and triazoles in grapes. The analytes were detected reproducibly with high mass accuracy (mass error within 5 ppm) and further confirmed by collision-induced dissociation fragmentation in tandem MS. The LODs and LOQs for all the analytes were found to be in the nanogram per gram level (15-20 ng/g LOQ)...
March 18, 2017: Journal of AOAC International
Niladri Sekhar Chatterjee, K Ashok Kumar, K K Ajeeshkumar, K R Remya Kumari, K V Vishnu, Rangasamy Anandan, Suseela Mathew, C N Ravishankar
Despite the potential of LC with tandem MS (MS/MS) in improving sensitivity and selectivity, analytical methods are scarce for the determination of protein-bound and phosphorylated forms of B vitamins in food. This prompted us to develop a method for LC-MS/MS determination of naturally occurring nicotinamide, nicotinic acid, thiamine, pyridoxine, riboflavin, pantothenic acid, biotin, folic acid, and cyanocobalamin in fish. Baseline separation of the vitamins was achieved in a hydrophilic interaction LC condition...
March 16, 2017: Journal of AOAC International
Kaushik Banerjee, Rajib Karmakar
No abstract text is available yet for this article.
March 16, 2017: Journal of AOAC International
Durvesh Sawant, Jitendra Kelkar, Pratap Rasam, Ajit Datar, Prashant Hase, Dheeraj Handique, Ankush Bhone, Sanket Chiplunkar, Manish Hate
A fast GC with tandem MS method was developed and validated for multiresidue determination of 95 chemical contaminants(24 synthetic pyrethroids, 17 organochlorines, 17 organophosphorus compounds, 18 polycyclic aromatic hydrocarbons, and 19 polychlorinated biphenyls) in Indian prawns (<i>Fenneropenaeus indicus</i>) as per the European Union maximum residual limit requirements. Chromatographic separation and MS determination were achieved within a short run time of 18 min, without compromising sensitivity and specificity...
March 16, 2017: Journal of AOAC International
Satyajeet Rai, Madhuri Devi Gullapalli, Anshuman Srivastava, Hussain Shaik, Mohammed Haris Siddiqui, Mohana Krishna Reddy Mudiam
An economical, rapid, and sensitive multiresidue method using liquid-liquid extraction (LLE) coupled with dispersive SPE (dSPE) cleanup was developed for the quantitative determination of 34 multiclass multiresidue (MCMR) pesticides (14 organochlorines, eight organophosphates, 10 synthetic pyrethroids, and two herbicides) in nonalcoholic carbonated beverages (cola, orange, lemon-lime, and citra) using GC with tandem MS. The procedure mainly involved LLE by dichloromethane and dSPE cleanup in the presence of magnesium sulfate, primary secondary amine, and C<sub>18</sub>...
March 16, 2017: Journal of AOAC International
Dinesh K Yadav, Khushbu Sharma, Anirban Dutta, Aditi Kundu, Akanksha Awasthi, Arnab Goon, Kaushik Banerjee, Supradip Saha
Curcuminoids, the active principle of <i>Curcuma longa </i>L, is one of the most researched subjects worldwide for its broad-spectrum biological activities. Being traditionally known for their anticancer properties and issues related to bioavailability, the curcuminoids, including diferuloylmethane (curcumin), have gained special attention. Thus, the current study focused on the purity profiling of curcuminoids when extracted by accelerated solvent extraction, which was run with turmeric rhizome powder (20 g) at 1500 psi and at 50°C, with a static time of 10 min and with three cycles...
March 16, 2017: Journal of AOAC International
Suchi Chawla, Hemlatta K Patel, Hetal N Gor, Kiran M Vaghela, Priti P Solanki, Paresh G Shah
The study was conducted to investigate matrix interferences using QuEChERS sample preparation to understand whether thedilution of matrix and/or the grouping of commodities can eliminate the need for selective individual matrix-matched standards in LC with tandem MS (MS/MS) analysis, and whether the calibration graph based on only one matrix can be used for quantification in the other matrixes. Matrix effects (MEs) were studied by comparing the slopes of calibration curves of the matrix-matched standards (diluted with mobile phase) vis-à-vis the solvent-based standards...
March 16, 2017: Journal of AOAC International
Hiteksha Panchal, Mamta B Shah
In this study, a simple and rapid LC with tandem MS method was developed and validated for the simultaneous determination of kaempferol and quercetin in <i>Thespesia populnea</i> extract. The compounds were eluted using a Gemini C18 column (50 × 2.0 mm, 3 μm), with the mobile phase consisting of acetonitrile–0.3% formic acid in water at the flow rate of 0.400 mL/min. The assay exhibited a linear dynamic range of 25–2500 ng/mL for both kaempferol and quercetin. The values for intra- and interday precision and accuracy were well within the generally accepted criteria for analytical methods (<15%)...
March 16, 2017: Journal of AOAC International
Akanksha S Kachhawaha, Pranav M Nagarnaik, Manjusha Jadhav, Anjali Pudale Pawan K Labhasetwar, Kaushik Banerjee
A quick, sensitive multiresidue method was developed for the analysis of 19 multiclass pharmaceuticals and personal care products (PPCPs) in surface water and sewage water. The proposed modified QuEChERS method involved the extraction of water samples (10 mL) with acetonitrile (10 mL) after the addition of 1% acetic acid, 4 g magnesium sulfate, and 0.2 g ammonium acetate, and was validated in distilled water, surface water, and sewage water with respect to linearity, LOD and LOQ, precision, and accuracy. The LOD and LOQ varied within the ranges of 0...
March 16, 2017: Journal of AOAC International
Sushil Kumar Saxena, Agnes Raju Karipalli, Anoop A Krishnan, Rajesh Rangasamy, Praveen Malekadi, Dhirendra P Singh, Vimesh Vasu, Vijay K Singh
This study enables the selective determination of inorganic arsenic (iAs) with a low detection limit using an economical instrument [atomic absorption spectrometer with hydride generation (HG)] to meet the regulatory requirements as per European Commission (EC) and Codex guidelines. Dry rice samples (0.5 g) were diluted using 0.1 M HNO<sub>3</sub>–3% H<sub>2</sub>O<sub>2</sub> and heated in a water bath (90 ± 2°C) for 60 min. Through this process, all the iAs is solubilized and oxidized to arsenate [As(V)]...
March 16, 2017: Journal of AOAC International
Brian Bullard, Curtis H Stumpf, Weidong Zhao, Stephanie Kuzenko, Gary Niehaus
The Crystal Diagnostics (CDx) Xpress S Kit is a rapid- screening assay for <i>Salmonella</i> spp. in whole raw tomatoes, whole chicken c`arcasses, raw ground beef, raw beef trim, and whole liquid pasteurized eggs with citric acid when present at levels of 1 CFU/portion size. The Xpress S system comprises an automatic CDx Xpress Reader and a single-use CDx BioCassette that incorporates antibody-coupled microspheres and liquid crystal for the selective identification of the intended microbe. In internal evaluations, the CDx Xpress S Kit detected all 142 <i>Salmonella</i> strains tested, including non-<i>enterica</i> subspecies, and excluded all non-<i>Salmonella</i> species assayed...
March 7, 2017: Journal of AOAC International
Kommer Brunt, Peter Sanders, Véronique Spichtig, Veronica Ernste-Nota, Paulina Sawicka, Kimberley Iwanoff, Jeroen Van Soest, Paul Kong Thoo Lin, Sean Austin
Until recently, only two AOAC <i>Official Methods</i><sup>SM</sup> have been available for the analysis of fructans: Method 997.08 and Method 999.03. Both are based on the analysis of the fructan component monosaccharides (glucose and fructose) after hydrolysis. The two methods have some limitations due to the strategies used for removing background interferences (such as from sucrose, α-glucooligosaccharides, and free sugars). The method described in this paper has been developed to overcome those limitations...
March 7, 2017: Journal of AOAC International
Árpád Ambrus, Gregory Noonan, Anikó Németh, Gabriella Kötelesné-Suszter, Michelangelo Anastassiades, Kamirán Á Hamow, Etelka M Solymosné
Pure analytical standards of pesticide residues may decompose or change their concentrations, especially in diluted standard solutions. The SANTE/11945/2015 guidance document on analytical quality control permits a ±10% difference between the concentrations in the new (100%) and the old standard solutions, which should be tested by comparing the average responses of the corresponding components obtained with a minimum of five replicate injections. To verify that the difference is within the permitted ±10%, the application of the two one-sided <italic>t</italic>-test (TOST) is recommended...
March 3, 2017: Journal of AOAC International
Hiroyuki Nagai
An analysis technique using LC with tandem MS (MS/MS) has been developed for the determination of buckwheat proteins, including major allergens. A protein solution extracted from buckwheat was reduced, alkylated, and digested by trypsin. Peptide spectra were obtained using full-scan LC-MS/MS analysis, and peptide sequences were determined through a protein search. Nine peptides of the 13S globulin seed storage protein and one peptide of a 16 kDa allergen were selected as the marker peptides, and multiple reaction monitoring conditions were optimized...
March 3, 2017: Journal of AOAC International
Jameel Ahmed Baig, Hina Daud Memon, Syed Ali Imran Bukhari, Tasneem Gul Kazi, Hassan Imran Afridi, Hafiz Muhammad Naseer, Latif Elci
A new simple, selective, and economical preconcentration method was developed for the determination of Cd, Pb, and Ni in poultry antibiotics and supplements. The proposed preconcentration procedure is based on SPE using 8-hydroxyquinoline and Amberlite IRC-50 resin as complex and adsorbent, respectively. The determination was carried out by microsample injection system (MIS) flame atomic absorption spectroscopy (FAAS). Several analytical parameters were examined, including pH, type of resin, amount of resin, type of eluent, eluent volume, flow rate, sample volume, and interference of diverse ions...
March 2, 2017: Journal of AOAC International
Xun Yan
This study demonstrates that short-chain polysaccharides, or oligosaccharides, could be sufficiently separated with hydrophilic interaction LC (HILIC) conditions and quantified by evaporative light-scattering detection (ELSD). The multianalyte calibration approach improved the efficiency of calibrating the nonlinear detector response. The method allowed easy quantification of short-chain carbohydrates. Using the HILIC method, the oligosaccharide solubility and its profile in water/alcohol solutions at room temperature were able to be quantified...
March 1, 2017: Journal of AOAC International
David Kline, Vicha Ritruthai, Silva Babajanian, Quanyin Gao, Prashant Ingle, Peter Chang, Gary Swanson
A single-laboratory validation study is described for a method of quantitative analysis of aloins (aloins A and B) andaloe-emodin in aloe vera raw materials and finished products. This method used HPLC coupled with UV detection at 380 nm for the aloins and 430 nm for aloe-emodin. The advantage of this test method is that the target analytes are concentrated from the sample matrix (either liquid or solid form) using stepwise liquid-liquid extraction (water-ethyl acetate-methanol), followed by solvent evaporation and reconstitution...
February 28, 2017: Journal of AOAC International
Yoko Uematsu, Toshiko Mizumachi, Kimio Monma
A method for simutaneously detecting 8 oil-soluble and 10 water-soluble (3 basic and 7 acidic) illegal dyes in foods was developed. The sample was mixed with water, followed by methanol and tetrahydrofuran. Transesterification with sodium methoxide was applied to the mixture, which allowed the triglycerides in the sample to be converted to fatty acid methyl esters. This treatment resulted in a biphasic mixture. Oil-soluble dyes and fatty acid methyl esters were deposited in the upper organic phase, which was cleaned using a silica-gel solid-phase extraction (SPE) column to remove the fatty acid methyl esters from the solution...
February 25, 2017: Journal of AOAC International
Wan-Ting Lin, Wun-Ling Chen, Wei-Chih Cheng, Hui-Chuan Chang, Shih-Wei Tsai
Food detergents are commonly used in households. The main components of detergents include surfactants and water. It has been found that certain compounds, which may cause health concerns, appear in food detergents, such as alkylphenols, arsenic, and lead. After applying food detergents is when people may be exposed to various levels of these chemicals when there are residues. In this study, the Taguchi experimental design was performed to determine the possible factors that might affect the residual characteristics of food detergent on dishware, fruits, and vegetables...
February 22, 2017: Journal of AOAC International
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"