Results 261 to 270 of about 51,926 (282)

Quantitative Analysis of Bile Acid with UHPLC-MS/MS

2020
Bile acids are important end products of cholesterol metabolism, having been shown to serve as signaling molecules and intermediates between the host and the gut microbiota. Here we describe a robust and accurate method using ultrahigh-pressure liquid chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS) for the quantification of bile ...
Yuan, Tian, Jingwei, Cai, Erik L, Allman, Philip B, Smith, Andrew D, Patterson   +4 more
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Study of Sangiovese Wines Pigment Profile by UHPLC-MS/MS

Journal of Agricultural and Food Chemistry, 2012
The metabolic pigment composition of Sangiovese wines produced from grapes harvested at 20 different vineyards in Montalcino over three consecutive years (2008-2010) on a semi-industrial scale and of 55 commercial Brunello di Montalcino wines (2004-2007) was studied, using a targeted method capable of analyzing 90 pigments in an 11 min UHPLC-MS/MS ...
Arapitsas, Panagiotis, Perenzoni, Daniele, Nicolini, Giorgio, Mattivi, Fulvio   +3 more
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Determination of carbapenems in water samples by UHPLC–MS/MS

Journal of Separation Science, 2020
AbstractA rapid and reliable method for the detection of five carbapenems (biapenem, imipenem, doripenem, meropenem, and faropenem) in water was developed and validated. After acidification of water samples with acetic acid, carbapenems were isolated using a Bond Elut PPL cartridge.
Chengfei Wang, Xiaowei Li, Ziquan Lv, Yingyu Wang, Yuebin Ke, Xi Xia   +5 more
openaire   +2 more sources

Polyether ionophores residues in Minas Frescal cheese by UHPLC-MS/MS

Food Additives & Contaminants: Part B, 2020
An analytical method was developed and validated for the determination of three polyether ionophores (monensin, lasalocid, and salinomycin) in 60 samples of Brazilian Minas Frescal cheese by UHPLC-MS/MS. Linearity ranged from 1 to 8 μg kg-1 for monensin and salinomycin, and from 0.50 to 4 μg kg-1 for lasalocid. Limits of detection and quantitation were
Felipe R N, Silva, Andrea R, Bortolotte, Patricia A de C, Braga, Felix G R, Reyes, Adriana P, Arisseto-Bragotto   +4 more
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Determination of higenamine in dietary supplements by UHPLC/MS/MS method

Journal of Pharmaceutical and Biomedical Analysis, 2017
From 1st January 2017 higenamine was added on the WADA (World Anti-doping Agency) Prohibited list under S3 group beta-2 agonists as at all times banned substance for the athletes. The main origine of higenamine (or norcoclaurine) are different plants including Nandina domestica, Aconitum carmichaelii, Asarum heterotropioides, Galium divaricatum, Annona
Stajić, Ana, Anđelković, Marija, Dikić, Nenad, Rasić, J., Vukašinović-Vesić, Milica, Ivanović, D., Jančić-Stojanović, Biljana   +6 more
openaire   +4 more sources

Quantification of 21 antihypertensive drugs in serum using UHPLC-MS/MS

Journal of Chromatography B, 2018
Poor drug adherence in hypertensive patients can lead to treatment failure and increased cardiovascular morbidity, as well as increased costs to society. An analytical method based on ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MSMS) was developed and validated for use in routine therapeutic drug monitoring (TDM).
Per Ole M. Gundersen, Arne Helland, Olav Spigset, Solfrid Hegstad   +3 more
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Ruhemann’s Purple Monitoring by UHPLC/MS/MS for Ninhydrin Test

Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi)
For amino acids used as food additives, Japan's Specifications and Standards for Food Additives stipulate the ninhydrin test as an identification test. The ninhydrin test is a simple method that involves the visual determination of purple color from the formation of Ruhemann's purple (RP) and does not require special equipment, facilitating its ...
Takashi, Kurohara, Chiye, Tatebe, Yumiko, Fujiwara, Fuyuko, Hioki, Shohei, Takada, Atsuko, Tada, Naoki, Sugimoto   +6 more
openaire   +2 more sources

Improved UHPLC-MS/MS Methods for Analysis of Isoprene-Derived Organosulfates

Analytical Chemistry, 2018
Secondary organic aerosol (SOA) is an important yet not fully characterized constituent of atmospheric particulate matter. A number of different techniques and chromatographic methods are currently used for the analysis of SOA, so the comparison of results from different laboratories poses a challenge.
Grzegorz Spolnik, Paulina Wach, Krzysztof J. Rudzinski, Krzysztof Skotak, Witold Danikiewicz, Rafal Szmigielski   +5 more
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Quantitative Auxin Metabolite Profiling Using Stable Isotope Dilution UHPLC‐MS/MS

Current Protocols in Plant Biology, 2016
AbstractAuxin, a plant hormone, is able to stimulate growth and to control developmental processes. To get a deeper level of understanding of how auxin activity is regulated in planta, we have developed a sensitive and selective mass spectrometry‐based protocol for multiplex quantification of indole 3‐acetic acid (IAA) as well as its precursors and ...
Novák O, Pěnčík A, Blahoušek O, Ljung K   +3 more
openaire   +3 more sources

Određivanje odabranih kanabinoida UHPLC-MS/MS tehnikom

2022
Kanabinoidi su spojevi koji se u posljednje vrijeme sve više istražuju radi svojih ljekovitih svojstava. Od osobite su važnosti nepsihoaktivni spojevi poput kanabidiola te njegovi derivati i metaboliti. Tekućinska kromatografija je jedna od najnaprednijih separacijskih tehnika u analitičkoj kemiji.
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