Chronological and geomorphological approach to the Holocene tephras from Tafí and Santa María valleys, NW Argentina

2020 ◽  
Vol 94 ◽  
pp. 14-30 ◽  
Author(s):  
María M. Sampietro-Vattuone ◽  
Walter A. Báez ◽  
José L. Peña-Monné ◽  
Alfonso Sola
Keyword(s):  
Mass Spectrometry ◽  
Late Holocene ◽  
El Paso ◽  
Northwestern Argentina ◽  
Middle Holocene ◽  
Complete Set ◽  
Back Arc ◽  
First Time ◽  
Santa Maria

AbstractA comprehensive morphostratigraphic and chronological study of the complete set of Holocene tephras from Tafí and Santa María valleys (northwestern Argentina), including analyses of compositional characteristics, is presented. Five ash tephras are recognized: V0 (El Rincón), V1a (Carreras 1a ash), V1b (Carreras 1b ash), V2a (Carreras 2 ash), and V2b (El Paso 3 ash). Two of them (V1b and V2b) are described for the first time in the study area. The new 14C and accelerator mass spectrometry ages presented, along with the previously published information, allows for the establishment of a chronological framework. The V0 tephra was deposited in the Early Holocene (about 10,000 yr BP), V1a and V1b were deposited in the Middle Holocene (about 4200 and 3500 yr BP, respectively), and V2a and V2b were deposited in the Late Holocene (after about 800 yr BP). The mineralogical, textural, and geochemical characterizations of the five tephras suggest that their tephra provenance was mainly from the back-arc region. However, the determination of the exact source of each tephra requires more accurate high-resolution tephrochronological studies. At least five major eruptions affected the Tafí and Santa María valleys in the last 10,000 yr.

scholarly journals Lanostane-Type Saponins from Vitaliana primuliflora

Molecules ◽  
2019 ◽  
Vol 24 (8) ◽  
pp. 1606 ◽  
Author(s):  
Włodarczyk ◽  
Szumny ◽  
Gleńsk
Keyword(s):  
Mass Spectrometry ◽  
High Resolution Mass Spectrometry ◽  
2D Nmr ◽  
Resonance Spectroscopy ◽  
Tandem Mass ◽  
Triterpenoid Saponins ◽  
The Family ◽  
Chemotaxonomic Markers ◽  
First Time

The phytochemistry of the genera Androsace, Cortusa, Soldanella, and Vitaliana, belonging to the Primulaceae family is not well studied so far. Hence, in this paper, we present the results of UHPLC-MS/MS analysis of several primrose family members as well as isolation and structure determination of two new saponins from Vitaliana primuliflora subsp. praetutiana. These two nor-triterpenoid saponins were characterized as (23S)-17α,23-epoxy-29-hydroxy-3β-[(O-β-d-glucopyranosyl-(1→2)-O-α-l-rhamnopyranosyl-(1→2)-O-β-d-glucopyranosyl-(1→2)-O-α-l-arabinopyranosyl-(1→6)-β-d-glucopyranosyl)oxy]-27-nor-lanost-8-en-25-one and (23S)-17α,23-epoxy-29-hydroxy-3β-[(O-α-l-rhamnopyranosyl-(1→2)-O-β-d-glucopyranosyl-(1→2)-O-α-l-arabinopyranosyl-(1→6)-β-d-glucopyranosyl)oxy]-27-nor-lanost-8-en-25-one, respectively. Their structures were determined by high resolution mass spectrometry (HRMS), tandem mass spectrometry (MS/MS), one- and two-dimensional nuclear magnetic resonance spectroscopy (1D-, and 2D-NMR) analyses. So far, the 27-nor-lanostane monodesmosides were rarely found in dicotyledon plants. Therefore their presence in Vitaliana and also in Androsace species belonging to the Aretia section is unique and reported here for the first time. Additionally, eleven other saponins were determined by HRMS and MS/MS spectra. The isolated lanostane saponins can be considered as chemotaxonomic markers of the family Primulaceae.

Development of a gas chromatography-mass spectrometry method for the determination of ultraviolet filters in beach sand samples

2014 ◽  
Vol 6 (19) ◽  
pp. 7772-7780 ◽  
Author(s):  
Isuha Tarazona ◽  
Alberto Chisvert ◽  
Amparo Salvador
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Analytical Method ◽  
Beach Sand ◽  
Gas Chromatography Mass Spectrometry ◽  
Uv Filters ◽  
Spectrometry Method ◽  
Mass Spectrometry Method ◽  
First Time

An analytical method for the determination of eight fat-soluble ultraviolet (UV) filters in beach sand samples is presented for the first time.

Rapid profiling and simultaneous determination of 12 major alkaloids in Nauclea officinalis by UPLC-Q-TOF-MS and HPLC-ESI-MS/MS

2021 ◽  
Author(s):  
Guanghou Wang ◽  
Hongjin Wang ◽  
Huan Liu ◽  
Yue Wang ◽  
Ziwei Lin ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Tandem Mass ◽  
Liquid Chromatography Tandem Mass ◽  
Phytochemical Profile ◽  
First Time ◽  
Tof Ms

For the first time, we determined the phytochemical profile of alkaloids from N. officinalis by ultraperformance liquid chromatography-quadrupole-time-of-flight-tandem mass spectrometry (UPLC-Q-TOF-MS/MS). A rapid, specific, and sensitive high-performance liquid chromatography-tandem mass...

Analysis of herbicide atrazine and its degradation products in cereals by ultra-performance liquid chromatography-mass spectrometry

2016 ◽  
Vol 8 (17) ◽  
pp. 3599-3604 ◽  
Author(s):  
Shuxuan Liang ◽  
Xinfeng Dong ◽  
Ming Su ◽  
Hanwen Sun
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Degradation Products ◽  
Ultra Performance Liquid Chromatography ◽  
Liquid Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Herbicide Atrazine ◽  
First Time

A novel ultra-performance liquid chromatography-mass spectrometry (UPLC-MS) method was developed for the first time for the determination of herbicide atrazine (ATR) and its principal metabolites namely desisopropylatrazine (DIA), desethylatrazine (DEA) and hydroxyatrazine (HA) in cereals.

Chiral liquid chromatography-mass spectrometry (LC-MS/MS) method development with β-cyclodextrin (β-CD) derivatized chiral stationary phase for the enhanced separation and determination of flurbiprofen enantiomers: application to a stereoselective pharmacokinetic study

2020 ◽  
Vol 44 (25) ◽  
pp. 10334-10342 ◽  
Author(s):  
Jiayi Sun ◽  
Beibei Liu ◽  
Liangzhao Cai ◽  
Jia Yu ◽  
Xingjie Guo
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Stationary Phase ◽  
Chiral Stationary Phase ◽  
Method Development ◽  
Liquid Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
First Time ◽  
Flurbiprofen Enantiomers

Home-made chiral stationary phase for enhanced enantioselective separation and determination of flurbiprofen by liquid chromatography-mass spectrometry (LC-MS/MS) for the first time.

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.

Gas-chromatographic determination of polyol profiles in cerebrospinal fluid.

1978 ◽  
Vol 24 (4) ◽  
pp. 545-548 ◽  
Author(s):  
S L Smith ◽  
M Novotny ◽  
E L Weber
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Cerebrospinal Fluid ◽  
Chromatographic Determination ◽  
Gas Chromatography Mass Spectrometry ◽  
Glass Capillary ◽  
Simple Method ◽  
Glass Capillary Columns ◽  
First Time

Abstract We describe a simple method for collectively determining polyols in the cerebrospinal fluid. The method consists of protein removal, sample derivatization, and gas chromatography of the trimethylsilylated polyols, with use of glass capillary columns. Nine major polyol constituents, the structures of which were verified by combined gas chromatography/mass spectrometry, can be simultaneously assayed. The presence of three polyols in the cerebrospinal fluid is reported here for the first time.

scholarly journals Determination of Saffron Volatiles by HS-SBSE-GC in Flavored Cured Ham

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2073
Author(s):  
Elena M. Gómez-Sáez ◽  
Natalia Moratalla-López ◽  
Cándida Lorenzo ◽  
Herminia Vergara ◽  
Gonzalo L. Alonso
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Volatile Compound ◽  
Meat Products ◽  
Stir Bar Sorptive Extraction ◽  
Gas Chromatography Mass Spectrometry ◽  
Food Industries ◽  
Sorptive Extraction ◽  
First Time

At present, the development of new agri-food products, including flavored meat products presented in ready-to-eat vacuum packs, is encouraged. The addition of ingredients used as flavoring agents creates the need to be able to determine the volatile compounds responsible for their characteristic aroma. The aim of this study is to propose, develop, and validate a new method that uses headspace-stir bar sorptive extraction-gas chromatography/mass spectrometry (HS-SBSE-GC/MS) to determine the saffron aroma in cured ham flavored with this spice. Results showed that safranal was the main volatile compound that could be identified and quantified in cured ham flavored with saffron. This analytical method was adequate in terms of linearity, selectivity, sensitivity, and accuracy. To our knowledge, this is the first time that an HS-SBSE-GC/MS method for determining the saffron aroma of flavored cured ham has been developed and validated, and it is of interest to agri-food industries.

Rapid Determination of Volatile Compounds Emitted from Chimonanthus praecox Flowers by HS-SPME-GC-MS

2004 ◽  
Vol 59 (9-10) ◽  
pp. 636-640 ◽  
Author(s):  
Chunhui Deng ◽  
Guoxin Song ◽  
Yaoming Hu
Keyword(s):  
Mass Spectrometry ◽  
Volatile Compounds ◽  
Methyl Salicylate ◽  
Rapid Determination ◽  
Benzyl Ester ◽  
Gas Chromatography Mass Spectrometry ◽  
Linalool Oxide ◽  
First Time ◽  
Chimonanthus Praecox

Abstract A novel rapid, simple and solvent-free method was developed for determination of the volatile compounds from the flowers of Chimonanthus praecox Link using headspace solidphase microextraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS). The SPME conditions were firstly optimized and applied to sampling of the volatile compounds emitted from living Chimonanthus praecox L. flowers and excised Chimonanthus praecox L. flowers. Thirty-one compounds emitted from living flowers were identified for the first time, which mainly included 4-methyl-1,3-pentadiene (2.0%), α-phellandrene (4.7%), benzyl methanol (11.1%), trans-linalool oxide (furanyl ring) (5.3%), α-linalool (36.0%), methyl salicylate (24.5%) and acetic acid benzyl ester (5.9%). Comparing the emission from living flowers and excised flowers, twenty-eight compounds were found to be detected in the two emissions, and three compounds, n-pentadecane, n-cetane and n-heptadecane, were only found in the emission from the living flowers, which shows that they might be biomarker compounds.

scholarly journals NNLO QCD predictions for W+c-jet production at the LHC

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Michał Czakon ◽  
Alexander Mitov ◽  
Mathieu Pellen ◽  
Rene Poncelet
Keyword(s):  
Cross Sections ◽  
Strange Quark ◽  
W Boson ◽  
Heavy Flavor ◽  
Hadron Colliders ◽  
Heavy Flavor Production ◽  
Theoretical Predictions ◽  
Complete Set ◽  
First Time

Abstract We study the production of a W boson in association with a c-jet at the LHC. We calculate, for the first time, the complete set of NNLO QCD corrections to the dominant CKM-diagonal contribution to this process. Both signatures, pp → μ+νμjc and pp →$$ {\mu}^{-}{\overline{\nu}}_{\mu }{\mathrm{j}}_c $$ μ − ν ¯ μ j c are considered. We present predictions for fiducial cross sections and differential distributions for each one of the two signatures as well as for their ratio. The theoretical predictions are compared with ATLAS measurements at 7 TeV. The results of this work are essential for the precision description of associated heavy flavor production at hadron colliders and for the determination of the strange-quark content of the proton from LHC data in NNLO QCD.

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