scholarly journals Tissue Sampling and Homogenization in the Sub-Microliter Scale with a Nanosecond Infrared Laser (NIRL) for Mass Spectrometric Proteomics

2021 ◽  
Vol 22 (19) ◽  
pp. 10833
Author(s):  
Jan Hahn ◽  
Manuela Moritz ◽  
Hannah Voß ◽  
Penelope Pelczar ◽  
Samuel Huber ◽  
...  
Keyword(s):  
Infrared Laser ◽  
Mass Spectrometric ◽  
Tissue Sampling ◽  
Colon Tissue ◽  
Ablation Volume ◽  
Chromatography Tandem Mass Spectrometry ◽  
Murine Spleen ◽  
Human Protein Atlas ◽  
Liquid Chromatography Tandem Mass ◽  
First Time

It was recently shown that ultrashort pulse infrared (IR) lasers, operating at the wavelength of the OH vibration stretching band of water, are highly efficient for sampling and homogenizing biological tissue. In this study we utilized a tunable nanosecond infrared laser (NIRL) for tissue sampling and homogenization with subsequent liquid chromatography tandem mass spectrometry (LC-MS/MS) analysis for mass spectrometric proteomics. For the first time, laser sampling was performed with murine spleen and colon tissue. An ablation volume of 1.1 × 1.1 × 0.4 mm³ (approximately 0.5 µL) was determined with optical coherence tomography (OCT). The results of bottom-up proteomics revealed proteins with significant abundance differences for both tissue types, which are in accordance with the corresponding data of the Human Protein Atlas. The results demonstrate that tissue sampling and homogenization of small tissue volumes less than 1 µL for subsequent mass spectrometric proteomics is feasible with a NIRL.

Synthesis of DABCO-based ionic liquid functionalized magnetic nanoparticles as a novel sorbent for the determination of cephalosporins in milk samples by dispersive solid-phase extraction followed by ultra-performance liquid chromatography-tandem mass spectrometry

2019 ◽  
Vol 43 (34) ◽  
pp. 13554-13570 ◽  
Author(s):  
Hamed Sahebi ◽  
Elaheh Konoz ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Solid Phase ◽  
Ultra Performance Liquid Chromatography ◽  
Dispersive Solid Phase Extraction ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Chromatography Tandem Mass Spectrometry ◽  
Functionalized Magnetic Nanoparticles ◽  
Liquid Chromatography Tandem Mass ◽  
First Time

In this study, DABCO-based ionic liquid-functionalized magnetic iron oxide nanoparticles were synthesized for the first time by the quaternization reaction with 1-(2,3-dihydroxypropyl)-1,4-diazabicyclo[2.2.2]octanylium chloride and chloro-functionalized Fe3O4 nanoparticles.

scholarly journals UPLC-MS/MS Profile of Alkaloids with Cytotoxic Properties of Selected Medicinal Plants of the Berberidaceae and Papaveraceae Families

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Anna Och ◽  
Katarzyna Szewczyk ◽  
Łukasz Pecio ◽  
Anna Stochmal ◽  
Daniel Załuski ◽  
...  
Keyword(s):  
Tandem Mass ◽  
Berberis Thunbergii ◽  
Chelidonium Majus ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass ◽  
Macleaya Cordata ◽  
Mahonia Aquifolium ◽  
Fumaria Officinalis ◽  
First Time ◽  
Dicentra Spectabilis

Cancer is one of the most occurring diseases in developed and developing countries. Plant-based compounds are still researched for their anticancer activity and for their quantity in plants. Therefore, the modern chromatographic methods are applied to quantify them in plants, for example, UPLC-MS/MS (ultraperformance liquid chromatography tandem mass spectrometry). Therefore, the aim of the present study was to evaluate the content of sanguinarine, berberine, protopine, and chelidonine in Dicentra spectabilis (L.) Lem., Fumaria officinalis L., Glaucium flavum Crantz, Corydalis cava L., Berberis thunbergii DC., Meconopsis cambrica (L.) Vig., Mahonia aquifolium (Pursh) Nutt., Macleaya cordata Willd., and Chelidonium majus L. For the first time, N,N-dimethyl-hernovine was identified in M. cambrica, B. thunbergii, M. aquifolium, C. cava, G. flavum, and C. majus; methyl-hernovine was identified in G. flavum; columbamine was identified in B. thunbergii; and methyl-corypalmine, chelidonine, and sanguinarine were identified in F. officinalis L. The richest source of protopine among all the examined species was M. cordata (5463.64 ± 26.3 μg/g). The highest amounts of chelidonine and sanguinarine were found in C. majus (51,040.0 ± 1.8 μg/g and 7925.8 ± 3.3 μg/g, resp.), while B. thunbergi contained the highest amount of berberine (6358.4 ± 4.2 μg/g).

Multi-residue determination of micropollutants in Nigerian fish from Lagos lagoon using ultrasound assisted extraction, solid phase extraction and ultra-high-performance liquid chromatography tandem mass spectrometry

2020 ◽  
Vol 12 (16) ◽  
pp. 2114-2122
Author(s):  
Idera Fabunmi ◽  
Natalie Sims ◽  
Kathryn Proctor ◽  
Aderonke Oyeyiola ◽  
Temilola Oluseyi ◽  
...  
Keyword(s):  
High Performance ◽  
Solid Phase ◽  
Ultrasound Assisted Extraction ◽  
Residue Determination ◽  
Chromatography Tandem Mass Spectrometry ◽  
Assisted Extraction ◽  
Liquid Chromatography Tandem Mass ◽  
Lagos Lagoon ◽  
First Time

This reports for the first time a simple and robust approach in determining pharmaceuticals in different fish species in Nigeria.

scholarly journals Plasma and Intracellular Tenofovir Pharmacokinetics in the Neonate (ANRS 12109 Trial, Step 2)

2011 ◽  
Vol 55 (6) ◽  
pp. 2961-2967 ◽  
Author(s):  
Déborah Hirt ◽  
Didier K. Ekouévi ◽  
Alain Pruvost ◽  
Saïk Urien ◽  
Elise Arrivé ◽  
...  
Keyword(s):  
Mononuclear Cells ◽  
Area Under The Curve ◽  
Population Approach ◽  
Peripheral Blood Mononuclear ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass ◽  
First Time ◽  
Very High ◽  
Hiv 1 ◽  
Tenofovir Diphosphate

ABSTRACTThe objective of this study was to investigate for the first time tenofovir (TFV) pharmacokinetics in plasma and peripheral blood mononuclear cells (PBMCs) of the neonate. HIV-1-infected pregnant women received two tablets of tenofovir disoproxil fumarate (TDF; 300 mg) and emtricitabine (FTC; 200 mg) at onset of labor and then one tablet daily for 7 days postpartum. A single dose of 13 mg/kg of body weight of TDF was administered to 36 neonates within 12 h of life after the HIV-1-infected mothers had been administered two tablets of TDF-emtricitabine at delivery. A total of 626 samples collected within the 2 days after the drug administration were measured by liquid chromatography-tandem mass spectrometry (LC-MS/MS) and analyzed by a population approach. In the neonate, the median TFV plasma area under the curve and minimal and maximal concentrations, respectively, were 3.73 mg/liter · h and 0.076 and 0.29 mg/liter. In PBMCs, TFV concentrations were detectable in all fetuses, whereas tenofovir diphosphate (TFV-DP) was quantifiable in only two fetuses, suggesting a lag in appearance of TFV-DP. The median TFV-DP neonatal concentration was 146 fmol/106cells (interquartile range [IQR], 53 to 430 fmol/106cells); two neonates had very high TFV-DP concentrations (1,530 and 2963 fmol/106cells). The 13-mg/kg TDF dose given to neonates produced plasma TFV and intracellular active TFV-DP concentrations similar to those in adults. This dose should be given immediately after birth to reduce the delay before the active compound TFV-DP appears in cells.

scholarly journals First Detection of Tetrodotoxins in the Cotylean Flatworm Prosthiostomum trilineatum

Marine Drugs ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 40
Author(s):  
Rei Suo ◽  
Maho Kashitani ◽  
Hikaru Oyama ◽  
Masaatsu Adachi ◽  
Ryota Nakahigashi ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
High Performance ◽  
Tandem Mass ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass ◽  
High Concentrations ◽  
First Time

Several polyclad flatworm species are known to contain high levels of tetrodotoxin (TTX), but currently TTX-bearing flatworms seem to be restricted to specific Planocera lineages belonging to the suborder Acotylea. During our ongoing study of flatworm toxins, high concentrations of TTXs were detected for the first time in the flatworm Prosthiostomum trilineatum, suborder Cotylea, from the coastal area of Hayama, Kanagawa, Japan. Toxin levels were investigated by high performance liquid chromatography-tandem mass spectrometry (LC-MS/MS), revealing that this species contains comparable concentrations of toxins as seen in planocerid flatworms such as Planocera multitentaculata. This finding indicated that there may be other species with significant levels of TTXs. The distribution of TTXs among other flatworm species is thus of great interest.

A selective and robust UPLC-MS/MS method for the simultaneous quantitative determination of anlotinib, ceritinib and ibrutinib in rat plasma and its application to a pharmacokinetic study

The Analyst ◽  
2019 ◽  
Vol 144 (18) ◽  
pp. 5462-5471 ◽  
Author(s):  
Ping Du ◽  
Yin Guan ◽  
Zhuoling An ◽  
Pengfei Li ◽  
Lihong Liu
Keyword(s):  
Mass Spectrometry ◽  
Kinase Inhibitors ◽  
Rat Plasma ◽  
Tandem Mass ◽  
Spectrometry Method ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass ◽  
Ultrahigh Performance Liquid Chromatography ◽  
First Time

A selective, robust ultrahigh performance liquid chromatography tandem mass spectrometry method was developed for the first time for the simultaneous determination of next-generation antitumor tyrosine kinase inhibitors in rat plasma using protein precipitation extraction.

scholarly journals LC–MS/MS Analysis of the Emerging Toxin Pinnatoxin-G and High Levels of Esterified OA Group Toxins in Galician Commercial Mussels

Toxins ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 394 ◽  
Author(s):  
Paz Otero ◽  
Natalia Miguéns ◽  
Inés Rodríguez ◽  
Luis M. Botana
Keyword(s):  
Potential Risk ◽  
Mytilus Galloprovincialis ◽  
Safety Monitoring ◽  
Tandem Mass ◽  
Chromatography Tandem Mass Spectrometry ◽  
The Matrix ◽  
Liquid Chromatography Tandem Mass ◽  
Standard Calibration ◽  
Commercially Important ◽  
First Time

The occurrence of marine harmful algae is increasing worldwide and, therefore, the accumulation of lipophilic marine toxins from harmful phytoplankton represents a food safety threat in the shellfish industry. Galicia, which is a commercially important EU producer of edible bivalve mollusk have been subjected to recurring cases of mussel farm closures, in the last decades. This work aimed to study the toxic profile of commercial mussels (Mytilus galloprovincialis) in order to establish a potential risk when ingested. For this, a total of 41 samples of mussels farmed in 3 Rías (Ares-Sada, Arousa, and Pontevedra) and purchased in 5 local markets were analyzed by liquid chromatography tandem mass spectrometry (LC–MS/MS). Chromatograms showed the presence of okadaic acid (OA), dinophysistoxin-2 (DTX-2), pectenotoxin-2 (PTX-2), azaspiracid-2 (AZA-2), and the emerging toxins 13-desmethyl spirolide C (SPX-13), and pinnatoxin-G (PnTX-G). Quantification of each toxin was determined using their own standard calibration in the range 0.1%–50 ng/mL (R2 > 0.99) and by considering the toxin recovery (62–110%) and the matrix correction (33–211%). Data showed that OA and DTX-2 (especially in the form of esters) are the main risk in Galician mollusks, which was detected in 38 samples (93%) and 3 of them exceeded the legal limit (160 µg/kg), followed by SPX-13 that was detected in 19 samples (46%) in quantities of up to 28.9 µg/kg. Analysis from PTX-2, AZA-2, and PnTX-G showed smaller amounts. Fifteen samples (37%) were positive for PTX-2 (0.7–2.9 µg/kg), 12 samples (29%) for AZA-2 (0.1–1.8 µg/kg), and PnTX-G was detected in 5 mussel samples (12%) (0.4 µg/kg–0.9 µg/kg). This is the first time Galician mollusk was contaminated with PnTX-G. Despite results indicating that this toxin was not a potential risk through the mussel ingestion, it should be considered in the shellfish safety monitoring programs through the LC–MS/MS methods.

Detection of mephedrone and its metabolites in fingerprints from a controlled human administration study by liquid chromatography-tandem mass spectrometry and paper spray-mass spectrometry

The Analyst ◽  
2020 ◽  
Vol 145 (8) ◽  
pp. 3038-3048 ◽  
Author(s):  
Joanna Czerwinska ◽  
Min Jang ◽  
Catia Costa ◽  
Mark C. Parkin ◽  
Claire George ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
Tandem Mass ◽  
Paper Spray ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass ◽  
First Time

Mephedrone and one of its metabolites have been detected for the first-time in fingerprints collected from a controlled human mephedrone administration study.

Sign in / Sign up

Export Citation Format

Share Document