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Analytical Techniques

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https://www.readbyqxmd.com/read/28088663/development-and-validation-of-a-sensitive-and-fast-uplc-ms-ms-method-for-simultaneous-determination-of-seven-bioactive-compounds-in-rat-plasma-after-oral-administration-of-guizhi-gancao-decoction
#1
Bin Ji, Limeng Zhuo, Bin Yang, Yang Wang, Lin Li, Miao Yu, Yunli Zhao, Zhiguo Yu
Rapid, sensitive, selective and accurate UPLC-MS/MS method was developed and fully validated for simultaneous determination of cinnamaldehyde, cinnamic acid, 2-methoxy cinnamic acid, glycyrrhizic acid, glycyrrhetinic acid, liquiritigenin and isoliquiritin in rat plasma after oral administration of Guizhi-gancao decoction. Plasma samples were processed with a simple protein precipitation technique using acetonitrile, followed by chromatographic separation using a Thermo Hypersil GOLD C18 column. A 11.0min linear gradient elution was used at a flow rate of 0...
January 9, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28088443/quantifying-confidence-in-the-reporting-of-metabolic-biotransformations
#2
David J Ponting, Ernest Murray, Anthony Long
How confident can we be in the assignment of metabolite structures? Are the analytical techniques used sufficient to support hypotheses about what is being formed? In this Feature, we discuss the results of an extensive survey into the analytical techniques used, and their value in the characterisation of metabolites. The survey covers the structures of over 16 000 metabolites formed from 1732 query compounds, covering over 35 years of the literature and a variety of journals. The value of different characterisation techniques is considered, alongside or in the absence of synthetic standards...
January 11, 2017: Drug Discovery Today
https://www.readbyqxmd.com/read/28088276/solid-supports-for-extraction-and-preconcentration-of-proteins-and-peptides-in-microfluidic-devices-a-review
#3
REVIEW
Szymon Dziomba, Monica Araya-Farias, Claire Smadja, Myriam Taverna, Benjamin Carbonnier, N Thuy Tran
Determination of proteins and peptides is among the main challenges of today's bioanalytical chemistry. The application of microchip technology in this field is an exhaustively developed concept that aims to create integrated and fully automated analytical devices able to quantify or detect one or several proteins from a complex matrix. Selective extraction and preconcentration of targeted proteins and peptides especially from biological fluids is of the highest importance for a successful realization of these microsystems...
February 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28088042/strategies-for-metabolite-profiling-based-on-liquid-chromatography
#4
REVIEW
Javier Saurina, Sonia Sentellas
This paper aims at covering the principal strategies based on liquid chromatography (LC) for metabolite profiling in the field of drug discovery and development. The identification of metabolites generated in the organism is an important task during the early stages of preclinical research to define the most proper strategy for optimizing, adjusting metabolic clearance and minimizing bioactivation. An early assessment of the metabolite profile may be critical since metabolites can contribute to pharmacological and/or toxicological effects...
January 9, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28087984/challenges-in-detecting-substances-for-equine-anti-doping
#5
REVIEW
A G Fragkaki, N Kioukia-Fougia, P Kiousi, M Kioussi, M Tsivou
The artificial increase of the physical capability of horses using drugs is well-known in racing and in other equine sports. Both illicit and therapeutic substances are regarded as prohibited substances in competition in most countries. Some countries do make distinctions for a few, specific drugs which are, however, allowed for use in other countries. The primary objective in the case of doping control is the detection of any trace of drug exposure, either parent drug or any of its metabolites, using the most powerful analytical methods which generally are based on chromatographic/mass spectrometric techniques...
January 14, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28081473/cortisol-extraction-through-human-skin-by-reverse-iontophoresis
#6
Stephanie A Ventura, Jason Heikenfeld, Tiffany Brooks, Leyla Esfandiari, Steven Boyce, Yoonjee Park, Gerald B Kasting
Continuous monitoring of cortisol at the surface of the skin would advance the diagnosis and treatment of cortisol-related diseases, or of elevated cortisol levels related to stress in otherwise healthy populations. Reliable and accurate detection of cortisol at the skin surface remains a limiting factor in real-time monitoring of cortisol. To address this limitation, cortisol extraction through excised human skin by reverse iontophoresis was studied in vitro in side-by-side diffusion cells using a radiolabeled probe...
December 28, 2016: Bioelectrochemistry
https://www.readbyqxmd.com/read/28080136/isoniazid-a-review-of-characteristics-properties-and-analytical-methods
#7
Guilherme Felipe Dos Santos Fernandes, Hérida Regina Nunes Salgado, Jean Leandro Dos Santos
Isoniazid is a synthetic antimicrobial and one of the most important first-line drugs used in the treatment of tuberculosis. Since it was introduced in the therapy in 1952, the drug remains at the front line of the antituberculosis treatment mainly due to its potency and high selectivity against Mycobacterium tuberculosis. Pharmaceutical analysis and therapeutic drug monitoring of isoniazid in both, pharmaceuticals and biological samples, plays an important role to comprehend aspects regarding to bioavailability, bioequivalence and therapeutic monitoring during patients following-up...
January 12, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28080135/characteristics-properties-and-analytical-methods-of-amoxicillin-a-review-with-green-approach
#8
Bianca Aparecida de Marco, Jéssica Sayuri Hisano Natori, Stefany Fanelli, Eliane Gandolpho Tótoli, Hérida Regina Nunes Salgado
Bacterial infections are the second leading cause of global mortality. Considering this fact, it is extremely important studying the antimicrobial agents. Amoxicillin is an antimicrobial agent that belongs to the class of penicillins; it has bactericidal activity and is widely used in the Brazilian health system. In literature, some analytical methods are found for the identification and quantification of this penicillin, which are essential for its quality control, which ensures maintaining the product characteristics, therapeutic efficacy and patient's safety...
January 12, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28079878/a-complete-workflow-for-high-resolution-spectral-stitching-nanoelectrospray-direct-infusion-mass-spectrometry-based-metabolomics-and-lipidomics
#9
Andrew D Southam, Ralf J M Weber, Jasper Engel, Martin R Jones, Mark R Viant
Metabolomic and lipidomic studies measure and discover metabolic and lipid profiles in biological samples, enabling a better understanding of the metabolism of specific biological phenotypes. Accurate biological interpretations require high analytical reproducibility and sensitivity, and standardized and transparent data processing. Here we describe a complete workflow for nanoelectrospray ionization (nESI) direct-infusion mass spectrometry (DIMS) metabolomics and lipidomics. After metabolite and lipid extraction from tissues and biofluids, samples are directly infused into a high-resolution mass spectrometer (e...
February 2016: Nature Protocols
https://www.readbyqxmd.com/read/28079243/serum-levels-of-vitamin-a-visual-function-and-ocular-surface-after-bariatric-surgery
#10
Luana Paula Nogueira de Araújo Brandão, Lucio Vilar, Bernardo Menelau Cavalcanti, Pedro Henrique Amorim Brandão, Tiago Eugênio Faria E Arantes, Josemberg Marins Campos
BACKGROUND: - Bariatric surgery is the most effective treatment for severe obesity, but the surgery increases the risk of developing nutritional deficiencies, such as vitamin A deficiency. In human metabolism, vitamin A plays a role in vision. OBJECTIVE: - To evaluate serum vitamin A, visual function and ocular surface of patients undergoing bariatric surgery. METHODS: - A cross-sectional and analytical study was conduced with 28 patients undergoing bariatric surgery for at least 6 months...
January 2017: Arquivos de Gastroenterologia
https://www.readbyqxmd.com/read/28079016/fast-hplc-fingerprinting-to-discriminate-olive-oil-from-other-edible-vegetable-oils-by-multivariate-classification-methods
#11
Ana M Jiménez-Carvelo, Antonio González-Casado, Estefanía Pérez-Castaño, Luis Cuadros-Rodríguez
A new analytical method for the differentiation of olive oil from other vegetable oils using reversed-phase LC and applying chemometric techniques was developed. A 3 cm short column was used to obtain the chromatographic fingerprint of the methyl-transesterified fraction of each vegetable oil. The chromatographic analysis took only 4 min. The multivariate classification methods used were <em>k</em>-nearest neighbors, partial least-squares (PLS) discriminant analysis, one-class PLS, support vector machine classification, and soft independent modeling of class analogies...
January 12, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28078433/a-meta-analysis-of-the-clinicopathological-characteristics-and-survival-outcomes-of-inflammatory-bowel-disease-associated-colorectal-cancer
#12
REVIEW
Ian S Reynolds, Aobhlinn O'Toole, Joseph Deasy, Deborah A McNamara, John P Burke
PURPOSE: The current study aims to use meta-analytical techniques to compare the clinicopathological characteristics and survival outcomes of inflammatory bowel disease (IBD) associated and sporadic colorectal carcinoma (CRC). Patients with IBD have an established increased risk of developing CRC. There is no consensus, however, on the clinicopathological characteristics and survival outcomes of IBD associated CRC when compared to sporadic CRC. METHODS: A comprehensive search for published studies comparing IBD associated and sporadic CRC was performed...
January 11, 2017: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/28078339/simultaneous-topographical-electrical-and-optical-microscopy-of-optoelectronic-devices-at-the-nanoscale
#13
Naresh Kumar, Alina Zoladek-Lemanczyk, Anne A Y Guilbert, Weitao Su, Sachetan M Tuladhar, Thomas Kirchartz, Bob C Schroeder, Iain McCulloch, Jenny Nelson, Debdulal Roy, Fernando A Castro
Novel optoelectronic devices rely on complex nanomaterial systems where the nanoscale morphology and local chemical composition are critical to performance. However, the lack of analytical techniques that can directly probe these structure-property relationships at the nanoscale presents a major obstacle to device development. In this work, we present a novel method for non-destructive, simultaneous mapping of the morphology, chemical composition and photoelectrical properties with <20 nm spatial resolution by combining plasmonic optical signal enhancement with electrical-mode scanning probe microscopy...
January 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28077846/relaxation-in-technique-leading-to-new-beginnings
#14
Endre Koritar
This paper explores how standard analytic technique may result in a repetition of past traumatic experiences in the transference and countertransference analytic situation. Relaxation and elasticity of technique can lead to re-integration of previously fragmented ego functions, and in remembering and re-experiencing of previously repressed symbolic representations of fragmenting past traumatic experiences, resulting in neocatharsis and working through, thus healing wounds and scars sustained in self development...
December 2016: American Journal of Psychoanalysis
https://www.readbyqxmd.com/read/28077842/psychoanalysis-and-the-emigration-of-central-and-eastern-european-intellectuals
#15
Ferenc Erős
One of the most important phenomena in the intellectual history of the 20th century was the exodus of the European mind, the emigration of persons, ideas, techniques, and institutions in the vast areas of social, human, and natural sciences, as well as in literature and the visual arts. Among these exiled intellectuals, psychoanalysts formed a special group. This paper examines the major lines of the emigration of psychoanalysts from the countries of issue to the countries of reception. It focuses, in particular on Hungarian analysts and analytic candidates who left their country of birth in two waves, first after the failure of revolutions in 1918/19 for Berlin, and then after 1938, to escape the Nazis...
December 2016: American Journal of Psychoanalysis
https://www.readbyqxmd.com/read/28077224/recommendations-for-choosing-single-case-data-analytical-techniques
#16
Rumen Manolov, Mariola Moeyaert
The current paper responds to the need to provide guidance to applied single-case researchers regarding the possibilities of data analysis. The amount of available single-case data analytical techniques has been growing during recent years and a general overview, comparing the possibilities of these techniques, is missing. Such an overview is provided that refers to techniques that yield results in terms of a raw or standardized difference and procedures related to regression analysis, as well as nonoverlap and percentage change indices...
January 2017: Behavior Therapy
https://www.readbyqxmd.com/read/28077060/methods-to-characterize-the-structure-of-food%C3%A2-powders-a-review
#17
Thao M Ho, Tuyen Truong, Bhesh R Bhandari
Food powders can exist in amorphous, crystalline or mixed structure depending on the order of molecular arrangement in the powder particle matrices. In food production, the structure of powders has a greatly effect on their stability, functionality, and applicability. The undesirable structure of powders can be accidentally formed during production. Therefore, characterization of powder structure as well as quantification of amorphous-crystalline proportions presenting in the powders are essential to control the quality of products during storage and further processing...
January 12, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28076773/thymol-detection-and-quantitation-by-solid-phase-microextraction-in-faeces-and-egg-yolk-of-japanese-quail
#18
María E Fernandez, Marcela A Palacio, María C Labaque
To measure bioavailability of the active ingredients of phytogenic feed additives in poultry products and subproducts is a key element for developing a rational understanding of its mode of action and biological effects. Hence, we validated a headspace solid phase microextraction (HS-SPME) technique followed by gas chromatography-mass spectrometry as an analytical extraction procedure and as method for detection and quantitation of 2-Isopropyl-5-methylphenol (thymol) in faeces and egg yolk of quail. The suitability of this method for thymol analysis in both matrices was first proved via linearity, limit of detection, limit of quantification, and recovery using m-cresol as internal standard...
December 31, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28076306/parallel-diurnal-fluctuation-of-testosterone-androstenedione-dehydroepiandrosterone-and-17ohprogesterone-as-assessed-in-serum-and-saliva-validation-of-a-novel-liquid-chromatography-tandem-mass-spectrometry-method-for-salivary-steroid-profiling
#19
Marco Mezzullo, Alessia Fazzini, Alessandra Gambineri, Guido Di Dalmazi, Roberta Mazza, Carla Pelusi, Valentina Vicennati, Renato Pasquali, Uberto Pagotto, Flaminia Fanelli
BACKGROUND: Salivary androgen testing represents a valuable source of biological information. However, the proper measurement of such low levels is challenging for direct immunoassays, lacking adequate accuracy. In the last few years, many conflicting findings reporting low correlation with the serum counterparts have hampered the clinical application of salivary androgen testing. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) makes it possible to overcome previous analytical limits, providing new insights in endocrinology practice...
January 11, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28075157/visual-occlusion-during-minimally-invasive-surgery-a-contemporary-review-of-methods-to-reduce-laparoscopic-and-robotic-lens-fogging-and-other-sources-of-optical-loss
#20
Todd Galvin Manning, Marlon Perera, Daniel Christidis, Ned Kinnear, Shannon McGrath, Richard O'Beirne, Paul Zotov, Damien M Bolton, Nathan Lawrentschuk
Background Maintenance of optimal vision during minimally invasive surgery is crucial to maintaining operative awareness, efficiency and safety. Hampered vision is commonly caused by laparoscopic lens fogging (LLF) which has prompted the development of various anti-fogging fluids and warming devices. However, limited comparative evidence exists in contemporary literature. Despite technological advancements there remains no consensus as to superior methods to prevent LLF or restore visual acuity once LLF has occurred...
January 11, 2017: Journal of Endourology
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