Ana Lozano

Instituto de Física Fundamental

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P. Limão-Vieira

Universidade Nova de Lisboa

G. Garcı́a

Consejo Superior de Investigaciones Científicas

K. S. McFarland

University of Rochester

J. Félix

Universidad de Guanajuato

J. K. Nelson

William & Mary

R. Gran

University of Minnesota, Duluth

M. A. Ramírez

California University of Pennsylvania

S. Manly

University of Rochester

L. Fields

University of Notre Dame

C. Nguyen

Rutgers, The State University of New Jersey

Cooperative Institutions

Minerva Foundation

Fermi National Accelerator Laboratory

University of Rochester

University of Almería

Flinders University

University of Buenos Aires

Consejo Superior de Investigaciones Científicas

Centre National de la Recherche Scientifique

Universidade Nova de Lisboa

Williams (United States)

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Benefits and pitfalls of the application of screening methods for the analysis of pesticide residues in fruits and vegetables

Journal of Chromatography A (2011)

Octavio Malato Ana Lozano Milagros Mezcúa Ana Agüera Amadeo R. Fernández‐Alba

Matrix (chemical analysis)

QuEChERS

10.1016/j.chroma.2011.06.110

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Citations (52)

Inclusion of 1-Naphthylacetic Acid and 2-(1-Naphthyl)acetamide into Three Typical Multiresidue Methods for LC/MS/MS Analysis of Tomatoes and Zucchini

Journal of AOAC International (2012)

Ana Lozano Andrés Pérez‐Parada Horácio Heinzen Amadeo R. Fernández‐Alba

Abstract In spite of high plant growth regulator application rates, little has been reported in the literature on determination of their residues in fruits and vegetables. This would be useful in monitoring good manufacturing practices and overall safety through the enforcement of maximum residue levels (MRLs). The present work describes method validation for the determination of 1-naphthylacetic acid (NAA) and 2(1-naphthyl)acetamide (NAAm) in tomato and zucchini using the mini-Luke, ethyl acetate (EtOAc) and acetate-buffered quick, easy, cheap, effective, rugged, and safe (QuEChERS) methods. Samples were spiked at two different levels: 50 and 100 μg/kg for NAA and 20 and 100 μg/kg for NAAm. These compounds were analyzed within the same chromatographic run with LC coupled to triple quadrupole MS (LC/(QqQ)MS/MS) in positive and negative electrospray ionization [ESI(+) and ESI(–)] modes for NAAm and NAA, respectively. For analyte confirmation, LC/ESI(-)QTOF-MS was also investigated given that NAA has only one multiple reaction monitoring transition (185.1→140.9 m/z). These three common methods were used to determine linearity, recoveries, precision (RSD), matrix effects, repeatability, and reproducibility (n = 5) for the selected matrixes. In terms of the Directorate-General for Health and Consumers (DG-SANCO) guidelines, only insignificant differences were found for the multiresidue methods tested, regardless of the commodity. Matrix-matched calibration was used, and LODs were below 10.1 μg/kg for NAA and 6.0 μg/kg for NAAm, which were lower than the MRLs established in current European Union legislation for these compounds. Obtained recoveries for NAA ranged from 87 to 107% with RSD values below 10% for mini-Luke, 83 to 107% with RSD <11% for EtOAc, and 76 to 85% with RSD ≤7% for QuEChERS. NAAm recoveries ranged from 74 to 102% with RSD ≤ 15% for mini-Luke, 76 to 97% with RSD <4% for EtOAc, and 76 to 93% with RSD ≤ 5% for QuEChERS. The linearity of the response over two orders of magnitude was demonstrated (r2 > 0.996) for all methods used. Good repeatability and reproducibility in terms of RSD were obtained (11.3–17.8%) for these analytical methods. The results were acceptable within the studied ranges for both analytes in all methods. As these multiresidue methods are used at the present time in many laboratories, this survey indicates that these analytes should be included in their monitoring scope.

Acetamide

10.5740/jaoacint.11-509

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Citations (6)

Total Electron Detachment and Induced Cationic Fragmentation Cross Sections for Superoxide Anion (O2−) Collisions with Benzene (C6H6) Molecules

International Journal of Molecular Sciences (2022)

Carlos Guerra Sarvesh Kumar Fernando Aguilar‐Galindo Sergio Díaz‐Tendero Ana Lozano

In this study, novel experimental total electron detachment cross sections for O

Fragmentation

10.3390/ijms23031266

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Citations (3)

Overcoming matrix effects using the dilution approach in multiresidue methods for fruits and vegetables

Journal of Chromatography A (2011)

Carmen Ferrer Ana Lozano Ana Agüera A. Jiménez Girón Amadeo R. Fernández‐Alba

Dilution

Isotope dilution

Matrix (chemical analysis)

Serial dilution

10.1016/j.chroma.2011.07.033

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Citations (411)

Ultrasound-assisted extraction based on QuEChERS of pesticide residues in honeybees and determination by LC-MS/MS and GC-MS/MS

Analytical and Bioanalytical Chemistry (2018)

María García M. Martı́nez Galera Samanta Uclés Ana Lozano Amadeo R. Fernández‐Alba

QuEChERS

10.1007/s00216-018-1167-7

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Citations (35)

Simultaneous Measurement of Muon Neutrino νμ Charged-Current Single π+ Production in CH, C, Physical Review Letters (2023)

A. Bercellie K. A. Kroma-Wiley S. Akhter Z. Ahmad Dar F. Akbar

Neutrino-induced charged-current single ${\ensuremath{\pi}}^{+}$ production in the $\mathrm{\ensuremath{\Delta}}(1232)$ resonance region is of considerable interest to accelerator-based neutrino oscillation experiments. In this Letter, high statistic differential cross sections are reported for the semiexclusive reaction ${\ensuremath{\nu}}_{\ensuremath{\mu}}A\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}+$ nucleon(s) on scintillator, carbon, water, iron, and lead targets recorded by MINERvA using a wideband ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ beam with $⟨{E}_{\ensuremath{\nu}}⟩\ensuremath{\approx}6\text{ }\text{ }\mathrm{GeV}$. Suppression of the cross section at low ${Q}^{2}$ and enhancement of low ${T}_{\ensuremath{\pi}}$ are observed in both light and heavy nuclear targets compared with phenomenological models used in current neutrino interaction generators. The cross sections per nucleon for iron and lead compared with CH across the kinematic variables probed are 0.8 and 0.5 respectively, a scaling which is also not predicted by current generators.

10.1103/physrevlett.131.011801

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Citations (3)

Absolute total electron detachment and relative ionisation cross sections for O₂ ⁻ collisions with O₂ in the energy range (10–1500 eV)

Plasma Sources Science and Technology (2022)

Carlos Guerra Ana Lozano M. Mendes Sarvesh Kumar J. C. Oller

Abstract Absolute total electron detachment cross for O 2 − collisions with O 2 are reported for impact energies ranging from 10 to 1600 eV as measured with a transmission-beam experimental apparatus. The primary anionic beam projectile is produced in a hollow cathode discharge-induced plasma, and the collisions with the neutral molecular target occur in a gas cell at a well-known constant pressure. The accurate determination of the gas pressure (within 8%) in the scattering chamber allowed us to clarify the important discrepancies (by about a factor 4) prevailing between previous total electron detachment cross-section measurements. Additional local maxima in the cross-section values, not previously observed, have been detected around 50 and 150 eV.

Maxima

Electron scattering

10.1088/1361-6595/ac4e22

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Citations (1)

A complete data set for the simulation of electron transport through gaseous tetrahydrofuran in the energy range 1–100 $$\hbox {eV}$$

The European Physical Journal D (2021)

Adrián García-Abenza Ana Lozano L. Álvarez J. C. Oller F. Blanco

Abstract A self-consistent data set, with all the necessary inputs for Monte Carlo simulations of electron transport through gaseous tetrahydrofuran (THF) in the energy range 1–100 eV, has been critically compiled in this study. Accurate measurements of total electron scattering cross sections (TCSs) from THF have been obtained, and considered as reference values to validate the self-consistency of the proposed data set. Monte Carlo simulations of the magnetically confined electron transport through a gas cell containing THF for different beam energies (3, 10 and 70 eV) and pressures (2.5 and 5.0 mTorr) have also been performed by using a novel code developed in Madrid. In order to probe the accuracy of the proposed data set, the simulated results have been compared with the corresponding experimental data, the latter obtained with the same experimental configuration where the TCSs have been measured. Graphic Abstract

Tetrahydrofuran

Electron scattering

Data set

10.1140/epjd/s10053-021-00300-7

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Citations (7)

Probing nuclear effects with neutrino-induced charged-current neutral pion production

Physical review. D/Physical review. D. (2020)

D. Coplowe O. Altinok Z. Ahmad Dar F. Akbar D. A. Andrade

We study neutrino-induced charged-current (CC) $\pi^0$ production on carbon nuclei using events with fully imaged final-state proton-$\pi^0$ systems. Novel use of final-state correlations based on transverse kinematic imbalance enable the first measurements of the struck nucleon's Fermi motion, of the intranuclear momentum transfer (IMT) dynamics, and of the final-state hadronic momentum configuration in neutrino pion production. Event distributions are presented for i) the momenta of neutrino-struck neutrons below the Fermi surface, ii) the direction of missing transverse momentum characterizing the strength of IMT, and iii) proton-pion momentum imbalance with respect to the lepton scattering plane. The observed Fermi motion and IMT strength are compared to the previous MINERvA measurement of neutrino CC quasielastic-like production. The measured shapes and absolute rates of these distributions, as well as the cross-section asymmetries show tensions with predictions from current neutrino generator models.

Charged current

Momentum (technical analysis)

10.1103/physrevd.102.072007

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Citations (26)

Use of neutrino scattering events with low hadronic recoil to inform neutrino flux and detector energy scale

Journal of Instrumentation (2021)

A. Bashyal D. Rimal B. Messerly Z. Ahmad Dar F. Akbar

Charged-current neutrino interactions with low hadronic recoil ("low-ν") have a cross-section that is approximately constant versus neutrino energy. These interactions have been used to measure the shape of neutrino fluxes as a function of neutrino energy at accelerator-based neutrino experiments such as CCFR, NuTeV, MINOS and MINERνA. In this paper, we demonstrate that low-ν events can be used to measure parameters of neutrino flux and detector models and that utilization of event distributions over the upstream detector face can discriminate among parameters that affect the neutrino flux model. From fitting a large sample of low-ν events obtained by exposing MINERνA to the NuMI medium-energy beam, we find that the best-fit flux parameters are within their a priori uncertainties, but the energy scale of muons reconstructed in the MINOS detector is shifted by 3.6% (or 1.8 times the a priori uncertainty on that parameter). These fit results are now used in all MINERνA cross-section measurements, and this technique can be applied by other experiments operating at MINERνA energies, such as DUNE.

Recoil

10.1088/1748-0221/16/08/p08068

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Citations (9)