Bibliographies thématiques / AccQ Tag Ultra UPLC

Littérature scientifique sur le sujet « AccQ Tag Ultra UPLC »

Auteur : Grafiati
Publié le 10 mars 2023

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Sommaire

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « AccQ Tag Ultra UPLC ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "AccQ Tag Ultra UPLC"

1

Chhonker, Yashpal, Staci Haney, Veenu Bala, Sarah Holstein et Daryl Murry. « Simultaneous Quantitation of Isoprenoid Pyrophosphates in Plasma and Cancer Cells Using LC-MS/MS ». Molecules 23, no 12 (11 décembre 2018) : 3275. http://dx.doi.org/10.3390/molecules23123275.

Texte intégral
Résumé :
Isoprenoids (IsoP) are an important class of molecules involved in many different cellular processes including cholesterol synthesis. We have developed a sensitive and specific LC-MS/MS method for the quantitation of three key IsoPs in bio-matrices, geranyl pyrophosphate (GPP), farnesyl pyrophosphate (FPP), and geranylgeranyl pyrophosphate (GGPP). LC-MS/MS analysis was performed using a Nexera UPLC System connected to a LCMS-8060 (Shimadzu Scientific Instruments, Columbia, MD) with a dual ion source. The electrospray ionization source was operated in the negative MRM mode. The chromatographic separation and detection of analytes was achieved on a reversed phase ACCQ-TAG Ultra C18 (1.7 µm, 100 mm × 2.1 mm I.D.) column. The mobile phase consisted of (1) a 10 mM ammonium carbonate with 0.1% ammonium hydroxide in water, and (2) a 0.1% ammonium hydroxide in acetonitrile/methanol (75/25). The flow rate was set to 0.25 mL/min in a gradient condition. The limit of quantification was 0.04 ng/mL for all analytes with a correlation coefficient (r2) of 0.998 or better and a total run time of 12 min. The inter- and intra-day accuracy (85–115%) precision (<15%), and recovery (40–90%) values met the acceptance criteria. The validated method was successfully applied to quantitate basal concentrations of GPP, FPP and GGPP in human plasma and in cultured cancer cell lines. Our LC-MS/MS method may be used for IsoP quantification in different bio-fluids and to further investigate the role of these compounds in various physiological processes.
Styles APA, Harvard, Vancouver, ISO, etc.
2

Carling, Rachel S., Benjamin AC McDonald, Donna Austin, Deborah Burden, Joana Correia, Jenny Leung, Beverley Mayers et Catharine John. « Challenging the status quo : A comparison of ion exchange chromatography with liquid chromatography–mass spectrometry and liquid chromatography–tandem mass spectrometry methods for the measurement of amino acids in human plasma ». Annals of Clinical Biochemistry : International Journal of Laboratory Medicine 57, no 4 (juillet 2020) : 277–90. http://dx.doi.org/10.1177/0004563220933303.

Texte intégral
Résumé :
Background Plasma amino acid analysis is key to the diagnosis and monitoring of inherited disorders of amino acid synthesis, catabolism and transport. Ion exchange chromatography (IEC) is widely accepted as the gold standard method of analysis, but with the introduction of liquid chromatography tandem mass spectrometry (LC-MS/MS) and liquid chromatography mass spectrometry (LC-MS) methods, this should now be questioned. Methods The analytical performance of three commercially available reagent kits, Waters AccQ Tag™ ULTRA LC-MS, SpOtOn Amino Acids LC-MS/MS and Chromsystems MassChrom® Amino Acid Analysis LC-MS/MS, were evaluated and compared with Biochrom Physiological Amino Acids ion exchange chromatography. Correlation with IEC was assessed by Passing-Bablok regression, concordance correlation coefficients (CCC) and Bland-Altman analysis for 21 common amino acids. Calculation of the total error from imprecision and bias was also used to benchmark performance. Results The MassChrom® and SpOtOn kits demonstrated acceptable inter-batch imprecision (CV < 10%) and accuracy (mean bias < 10%), whereas the AccQ Tag™ ULTRA kit did not. Good correlation (CCC > 0.95) with Biochrom IEC was demonstrated for 10/21 analytes in both the MassChrom® and SpOtOn kits and 6/21 in the AccQ Tag™ ULTRA kit. Conclusions The LC-MS assay demonstrated variable analytical performance and correlated poorly with ion exchange chromatography. Both LC-MS/MS assays demonstrated comparable analytical performance and reasonable correlation with ion exchange chromatography. They also confer practical advantages which cannot be realized by ion exchange chromatography, superior specificity and significantly faster analysis time, suggesting that ion exchange chromatography should no longer be described as the gold standard method for plasma amino acid analysis.
Styles APA, Harvard, Vancouver, ISO, etc.
3

Chernova, Alina, Rim Gubaev, Pavel Mazin, Svetlana Goryunova, Yakov Demurin, Lyudmila Gorlova, Anna Vanushkina et al. « UPLC–MS Triglyceride Profiling in Sunflower and Rapeseed Seeds ». Biomolecules 9, no 1 (27 décembre 2018) : 9. http://dx.doi.org/10.3390/biom9010009.

Texte intégral
Résumé :
Sunflower and rapeseed are among the most important sources of vegetable oil for food and industry. The main components of vegetable oil are triglycerides (TAGs) (about 97%). Ultra- performance liquid chromatography coupled with mass spectrometry (UPLC–MS) profiling of TAGs in sunflower and rapeseed has been performed and the TAG profiles obtained for these species have been compared. It has been identified that 34 TAGs are shared by sunflower and rapeseed. It was demonstrated that TAGs 52:2, 52:5, 52:6, 54:3; 54:4, 54:7, 56:3, 56:4, and 56:5 had the highest variability levels between sunflower and rapeseed with the higher presence in rapeseed. TAGs 50:2, 52:3, 52:4, 54:5, and 54:6 also showed high variability, but were the most abundant in sunflower. Moreover, the differences in TAG composition between the winter-type and spring-type rapeseed have been revealed, which may be associated with freezing tolerance. It was shown that winter-type rapeseed seeds contain TAGs with a lower degree of saturation, while in spring-type rapeseed highly saturated lipids are the most abundant. These findings may give new insights into the cold resistance mechanisms in plants the understanding of which is especially important in terms of global climate changes.
Styles APA, Harvard, Vancouver, ISO, etc.
4

Jämtgård, Sandra, Nicole Robinson, Thomas Moritz, Michelle L. Colgrave et Susanne Schmidt. « Optimising methods for the recovery and quantification of di- and tripeptides in soil ». Soil Research 56, no 4 (2018) : 404. http://dx.doi.org/10.1071/sr17279.

Texte intégral
Résumé :
Di- and tripeptides are intermediaries in the nitrogen cycle and are likely to have roles in the soil–microbe–plant continuum, but they have hitherto been difficult to measure in soils. To lay the base for future studies of oligopeptides in soil, we added 10 known di- and tripeptides with diverse chemical properties to forest and agricultural soils and then recovered the peptides by means of induced diffusive fluxes using microdialysis, a minimally-intrusive soil sampling technique. The concentration of the peptides recovered with the probes was 25–39% (relative recovery) of the concentration in the external solution, and followed the same trend as previously observed for amino acids, with smaller peptides (e.g. Gly-Gly) recovered at a higher rate than larger ones (e.g. Tyr-Phe). After derivatisation with AccQ-Tag™, a standard method for amino acids, peptides were analysed by ultra-high-pressure liquid chromatography-triple quadrupole mass spectrometry. Multiple reaction monitoring mass spectrometry was used to quantify specific peptides with a short run time of 15 min and a detection limit of 0.01–0.02 pmol injected (0.005–0.01 pmol µL–1) for the different peptides. This methodology allowed successful analysis of all standard di- and tripeptides tested here. We conclude that microdialysis in combination with UHPLC-MS will allow measurement of plant-relevant fluxes of di- and tripeptides in undisturbed soil.
Styles APA, Harvard, Vancouver, ISO, etc.
5

Armenta, Jenny M., Diego F. Cortes, John M. Pisciotta, Joel L. Shuman, Kenneth Blakeslee, Dominique Rasoloson, Oluwatosin Ogunbiyi, David J. Sullivan et Vladimir Shulaev. « Sensitive and Rapid Method for Amino Acid Quantitation in Malaria Biological Samples Using AccQ•Tag Ultra Performance Liquid Chromatography-Electrospray Ionization-MS/MS with Multiple Reaction Monitoring ». Analytical Chemistry 82, no 2 (15 janvier 2010) : 548–58. http://dx.doi.org/10.1021/ac901790q.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
6

Giuffrida, Francesca, Cynthia Marmet, Isabelle Tavazzi, Patric Fontannaz, Julien Sauser, Le Lee et Frédéric Destaillats. « Quantification of 1,3-olein-2-palmitin (OPO) and Palmitic Acid in sn-2 Position of Triacylglycerols in Human Milk by Liquid Chromatography Coupled with Mass Spectrometry ». Molecules 24, no 1 (21 décembre 2018) : 22. http://dx.doi.org/10.3390/molecules24010022.

Texte intégral
Résumé :
This study describes the identification and quantification of fatty acids in the sn-2 position of triacylglycerols (TAG) and of the most abundant TAG regioisomers in human milk by liquid chromatography coupled with high-resolution mass spectrometry (HPLC-HRMS). Over 300 individual TAG species were observed and 1,3-olein-2-palmitin (OPO) was identified as the most abundant TAG regioisomer. Validation of the HPLC-HRMS method showed repeatability and intermediate reproducibility values ranging from 3.1 to 16.6% and 4.0 to 20.7%, respectively, and accuracy ranging from 75 to 97%. Results obtained by the HPLC-HRMS method were comparable to results from the ISO 6800 method for the quantification of palmitic acid in the sn-2 position of TAG (81.4 and 81.8 g 100 g−1 total palmitic acid, respectively). Processing the data obtained with the HPLC-HRMS method is extremely time consuming and, therefore, a targeted method suitable for the quantification of OPO in human milk samples by ultra-performance (UP) LC coupled with triple quadrupole (QQQ) MS was developed and validated. OPO identification and quantification by UPLC-QQQ were based on nominal mass and a fragmentation pattern obtained by multiple reaction monitoring experiments. The method was validated in terms of accuracy and precision by analyzing different aliquots of the same human milk sample over time and comparing the results with values obtained by HPLC-HRMS. Intermediate reproducibility was <15% and trueness comparable to HPLC-HRMS. Quantification of OPO in human milk samples collected at 30, 60 and 120 days postpartum showed that OPO content varies between 333 ± 11.8 and 383 ± 18.0 mg 100mL−1.
Styles APA, Harvard, Vancouver, ISO, etc.
7

Law, Tsz Hong, Holger A. Volk, Yuanlong Pan, Brian Zanghi et Elizabeth J. Want. « Metabolic perturbations associated with the consumption of a ketogenic medium-chain TAG diet in dogs with idiopathic epilepsy ». British Journal of Nutrition 120, no 5 (13 juillet 2018) : 484–90. http://dx.doi.org/10.1017/s0007114518001617.

Texte intégral
Résumé :
AbstractConsumption of diets containing medium-chain TAG (MCT) has been shown to confer neuroprotective effects. We aim to identify the global metabolic perturbations associated with consumption of a ketogenic diet (medium-chain TAG diet (MCTD)) in dogs with idiopathic epilepsy. We used ultra-performance liquid chromatography-MS (UPLC-MS) to generate metabolic and lipidomic profiles of fasted canine serum and made comparisons between the MCTD and standardised placebo diet phases. We identified metabolites that differed significantly between diet phases using metabolite fragmentation profiles generated by tandem MS (UPLC–MS/MS). Consumption of the MCTD resulted in significant differences in serum metabolic profiles when compared with the placebo diet, where sixteen altered lipid metabolites were identified. Consumption of the MCTD resulted in reduced abundances of palmitoylcarnitine, octadecenoylcarnitine, stearoylcarnitine and significant changes, both reduced and increased abundances, of phosphatidylcholine (PC) metabolites. There was a significant increase in abundance of the saturated C17 : 0 fatty acyl moieties during the MCTD phase. Lysophosphatidylcholine (17 : 0) (P=0·01) and PC (17:0/20:4) (P=0·03) were both significantly higher in abundance during the MCTD. The data presented in this study highlight global changes in lipid metabolism, and, of particular interest, in the C17 : 0 moieties, as a result of MCT consumption. Elucidating the global metabolic response of MCT consumption will not only improve the administration of current ketogenic diets for neurological disease models but also provides new avenues for research to develop better diet therapies with improved neuroprotective efficacies. Future studies should clarify the involvement and importance of C17 : 0 moieties in endogenous MCT metabolic pathways.
Styles APA, Harvard, Vancouver, ISO, etc.
8

Gaudin, Zachary, Delphine Cerveau, Nathalie Marnet, Alain Bouchereau, Philippe Delavault, Philippe Simier et Jean-Bernard Pouvreau. « Robust Method for Investigating Nitrogen Metabolism of15N Labeled Amino Acids Using AccQ•Tag Ultra Performance Liquid Chromatography-Photodiode Array-Electrospray Ionization-Mass Spectrometry : Application to a Parasitic Plant–Plant Interaction ». Analytical Chemistry 86, no 2 (6 janvier 2014) : 1138–45. http://dx.doi.org/10.1021/ac403067w.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
9

E, Papachristou, Tyrpenou AE, Kastritsi-Katharios I et Kotzamanis Y. « Proximate Composition and Amino Acid Profile of the Edible Muscle of European Crayfish Astacus astacus L. Inhabiting the Orchomenos Region in Central Greece ». Austin Journal of Nutrition and Food sciences 9, no 1 (3 mai 2021). http://dx.doi.org/10.26420/austinjnutrmetab.2021.1152.

Texte intégral
Résumé :
The aim of this study was to determine the proximate composition and amino acid profile of the edible muscle of European crayfish Astacus astacus L. Animals were collected from Orchomenos region in Central Greece and muscle tissue samples were collected for chemical analysis. Total crude protein and crude lipid content of muscle tissues were determined using the Kjeldahl method and Folch’s procedure, respectively. Amino acids profile was performed by Ultra Performance Liquid Chromatographic (UPLC) determination of the acid hydrolysed muscle extract after derivatization with AccQ-Tag reagent (Waters, USA). The results showed that protein and lipid content of crayfish muscle tissue were 16.55 ± 0.4 g 100 g-1 and 0.52 ± 0.20 g 100 g-1, respectively. Also, the moisture and ash content were 80.93 ± 0.36 g 100 g-1 and 1.25 ± 0.14 g 100 g-1, respectively. Amino acids analysis of muscle tissue revealed that the highest values were those of glutamic acid (2.98 g 100 g-1) and arginine (2.19 g 100g-1) as well as those for aspartic acid (1.88 g 100 g-1), lysine (1.47 g 100 g-1) and leucine (1.33 g 100 g-1). The lowest values were found for histidine (0.35 ± 0.03 g 100 g-1) and methionine (0.47 ± 0.01 g 100 g-1). The results of this study showed that the crayfish of Orchomenos region can be considered as an important source of essential nutrients in the human diet due to its protein and essential amino acids content, which are relatively comparable to those of farmed sea bream (Sparus aurata L.), as well as to farmed and wild sea bass (Dicentrarchus labrax). However, the lipid content of Orchomenos crayfish was found to be insignificant and negligible. Overall, the protein quality of European crayfish can be considered as a main factor in selecting this species as a candidate species for European aquaculture diversification.
Styles APA, Harvard, Vancouver, ISO, etc.
10

Luparelli, Anna Valentina, Giulia Leni, Andrea Fuso, Clara Pedrazzani, Sara Palini, Stefano Sforza et Augusta Caligiani. « Development of a Quantitative UPLC-ESI/MS Method for the Simultaneous Determination of the Chitin and Protein Content in Insects ». Food Analytical Methods, 29 septembre 2022. http://dx.doi.org/10.1007/s12161-022-02411-2.

Texte intégral
Résumé :
Abstract In a context where the commercial and nutritional interest in insect chitin is always increasing, an accurate and precise method to quantify this biopolymer, especially in food/feed, is required. In addition, quantification of insect crude protein through nitrogen determination is normally overestimated due to the presence of chitin. In this work, for the first time, an RP-UPLC-ESI/MS method for the simultaneous quantification in insects of chitin, as glucosamine (GlcN), and protein, as total amino acids, is presented. The method is based on acid hydrolysis and derivatization of amino acids and GlcN with the AccQ Tag reagent. Method was optimized and validated in terms of linearity, LOD and LOQ, intraday and inter-day repeatability, and accuracy. A hydrolysed commercial chitin was selected as reference standard for calibration. The instrumental LOD and LOQ correspond respectively to a concentration of 0.00068 mM and 0.00204 mM. The intraday precision satisfied the Horwitz ratio. Data from inter-day precision showed the necessity to perform the analysis within 1 week utilizing standard calibration solutions freshly prepared. A matrix effect was observed, which suggested the necessity to use an internal calibration curve or to work in a particular concentration range of GlcN. The chitin and protein content in black soldier fly (Hermetia illucens) and lesser mealworm (Alphitobius diaperinus) were found in agreement with results obtained by independent methods. The optimized method was also tested on two different commercial food supplements, suggesting its applicability on a wide range of matrices. This newly developed method proved to be simple, more accurate, and faster if compared to methods which separately analyse chitin and protein content.
Styles APA, Harvard, Vancouver, ISO, etc.

Thèses sur le sujet "AccQ Tag Ultra UPLC"

1

POTENZA, MARIANGELA. « Development of innovative analytical techniques for the characterization of protein materials in art, architecture and archaeology ». Doctoral thesis, 2014. http://hdl.handle.net/2158/844717.

Texte intégral
Résumé :
Sviluppo di tecniche analitiche di tipo biochimico e cromatografico per la caratterizzazione di proteine nel campo dell'arte e dell'archeologia Development of analytical techniques for chromatographic and biochemical characterization of proteins in the field of art and archeology
Styles APA, Harvard, Vancouver, ISO, etc.

Chapitres de livres sur le sujet "AccQ Tag Ultra UPLC"

1

Salazar, Carolina, Jenny M. Armenta, Diego F. Cortés et Vladimir Shulaev. « Combination of an AccQ•Tag-Ultra-Performance Liquid Chromatographic Method with Tandem Mass Spectrometry for the Analysis of Amino Acids ». Dans Methods in Molecular Biology, 191–206. New York, NY : Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9639-1_15.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!

Vers la bibliographie