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Martins AJ, de Cássia F Bezerra R, Saraiva GD, Lima Junior JA, Silva RS, Oliveira AC, Campos AF, Morales MA, Jiménez-Jiménez J, Rodríguez-Castellón E. Effects on structure by spectroscopic investigations, valence state and morphology properties of FeCo-containing SnO 2 catalysts for glycerol valorization to cyclic acetals. Spectrochim Acta A Mol Biomol Spectrosc 2024; 317:124416. [PMID: 38733915 DOI: 10.1016/j.saa.2024.124416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 03/11/2024] [Accepted: 05/05/2024] [Indexed: 05/13/2024]
Abstract
The effects on the structure, valence state and morphological properties of FeCo-containing SnO2 nanostructured solids were investigated. The physicochemical features were tuned by distinct synthesis routes e.g., sol-gel, coprecipitation and nanocasting, to apply them as catalysts in the glycerol valorization to cyclic acetals. Based on Mössbauer and XPS spectroscopy results, all nanosized FeCoSn solids have Fe-based phases, which contain Co and Sn included in the structure, and well-dispersed Fe3+ and Fe2+ surface active sites. Raman, FTIR and EPR spectroscopies measurements of the spent solids demonstrated structural stability for the sol-gel based solid, which is indeed responsible for the highest catalytic performance, among the nanocasted and coprecipitated counterparts. Morphological and elemental analyses illustrated distinct morphologies and composition on solid surface, depending on the synthesis route. The Fe/Co and Fe/Sn surface ratios are closely related to the catalytic performance. The improved glycerol conversion and selectivities of the solid obtained by sol-gel method was ascribed to the leaching resistance and the Sn action as a structural promoter.
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Affiliation(s)
- Antonio J Martins
- Universidade Federal do Ceará, Campus do Pici-Bloco 940, Departamento de Química Analitica e Físico-Química, Fortaleza, Ceará, Brazil
| | - Rita de Cássia F Bezerra
- Universidade Federal do Ceará, Campus do Pici-Bloco 940, Departamento de Química Analitica e Físico-Química, Fortaleza, Ceará, Brazil
| | - Gilberto D Saraiva
- Faculdade de Educação, Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, Quixadá 63902-098, Ceará, Brazil
| | - José A Lima Junior
- Universidade Federal do Ceará, Departamento de Física, Fortaleza, Ceará, Brazil
| | - Rômulo S Silva
- Universidade Federal do Ceará, Departamento de Física, Fortaleza, Ceará, Brazil
| | - Alcineia C Oliveira
- Universidade Federal do Ceará, Campus do Pici-Bloco 940, Departamento de Química Analitica e Físico-Química, Fortaleza, Ceará, Brazil.
| | - Adriana F Campos
- CETENE, Av. Prof. Luiz Freire, 01, Cidade Universitária, Recife 50740-545, Pernambuco, Brazil
| | - Marco A Morales
- Universidade Federal do Rio Grande do Norte, Departamento de Física Teórica e Experimental, Natal 59078-970, Rio Grande do Norte, Brazil
| | - José Jiménez-Jiménez
- Universidad de Málaga, Departamento de Química Inorgánica, Facultad de Ciencias, 29071, Málaga, Spain
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Campos AF, Wang K, Duden T, Tejeda A. Response to "Comment on 'Spin- and angle-resolved inverse photoemission setup with spin orientation independent from electron incidence angle'" [Rev. Sci. Instrum. 93, 093904 (2022)]. Rev Sci Instrum 2023; 94:037102. [PMID: 37012809 DOI: 10.1063/5.0137762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 02/24/2023] [Indexed: 06/19/2023]
Abstract
We reply to the Comment by Donath et al. on our setup, which allows a total 3D control of the polarization direction of the electron beam in an inverse photoemission spectroscopy (IPES) experiment, a significant advance with respect to previous setups with partial polarization control. Donath et al. claim an incorrect operation of our setup after comparing their results, treated to enhance the spin asymmetry, with our spectra without the same treatment. They also equal spectra backgrounds instead of equaling peak intensities above the background. Thus, we compare our Cu(001) and Au(111) results with the literature. We reproduce previous results, including spin-up/spin-down spectral differences observed for Au and not observed for Cu. Also, spin-up/spin-down spectral differences appear at the expected reciprocal space regions. In the Comment, it is also stated that our tuning of the spin polarization misses the target because the spectra background changes when tuning the spin. We argue that the background change is irrelevant to IPES since the information is contained in peaks produced by primary electrons, those having conserved their energy in the inverse photoemission process. Second, our experiments agree with previous results from Donath et al. [Wissing et al., New J. Phys. 15, 105001 (2013)] and with a zero-order quantum-mechanical model of spins in vacuum. Deviations are explained by more realistic descriptions including the spin transmission through an interface. Consequently, the operation of our original setup is fully demonstrated. Our development corresponds to "the promising and rewarding angle-resolved IPES setup with the three-dimensional spin resolution," as indicated in the Comment, after our work.
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Affiliation(s)
- A F Campos
- Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - K Wang
- Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - T Duden
- Constructive Solutions for Science and Technology, 33649 Bielefeld, Germany
| | - A Tejeda
- Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, 91405 Orsay, France
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Campos AF, Duret P, Cabaret S, Duden T, Tejeda A. Spin- and angle-resolved inverse photoemission setup with spin orientation independent from electron incidence angle. Rev Sci Instrum 2022; 93:093904. [PMID: 36182468 DOI: 10.1063/5.0076088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 05/21/2022] [Indexed: 06/16/2023]
Abstract
A new spin- and angle-resolved inverse photoemission setup with a low-energy electron source is presented. The spin-polarized electron source, with a compact design, can decouple the spin polarization vector from the electron beam propagation vector, allowing one to explore any spin orientation at any wavevector in angle-resolved inverse photoemission. The beam polarization can be tuned to any preferred direction with a shielded electron optical system, preserving the parallel beam condition. We demonstrate the performances of the setup by measurements on Cu(001) and Au(111). We estimate the energy resolution of the overall system at room temperature to be ∼170 meV from kBTeff of a Cu(001) Fermi level, allowing a direct comparison to photoemission. The spin-resolved operation of the setup has been demonstrated by measuring the Rashba splitting of the Au(111) Shockley surface state. The effective polarization of the electron beam is P = 30% ± 3%, and the wavevector resolution is ΔkF ≲ 0.06 Å-1. Measurements on the Au(111) surface state demonstrate how the electron beam polarization direction can be tuned in the three spatial dimensions. The maximum of the spin asymmetry is reached when the electron beam polarization is aligned with the in-plane spin polarization of the Au(111) surface state.
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Affiliation(s)
- A F Campos
- Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - P Duret
- Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - S Cabaret
- Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - T Duden
- Constructive Solutions for Science and Technology, 33649 Bielefeld, Germany
| | - A Tejeda
- Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, 91405 Orsay, France
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Neto AB, Oliveira AC, Rodriguez-Castellón E, Campos AF, Freire PT, Sousa FF, Filho JM, Araujo JC, Lang R. A comparative study on porous solid acid oxides as catalysts in the esterification of glycerol with acetic acid. Catal Today 2020. [DOI: 10.1016/j.cattod.2018.05.057] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Bomfim LM, Menezes LRA, Rodrigues ACBC, Dias RB, Rocha CAG, Soares MBP, Neto AFS, Nascimento MP, Campos AF, Silva LCRCE, Costa EV, Bezerra DP. Antitumour Activity of the Microencapsulation of Annona vepretorum Essential Oil. Basic Clin Pharmacol Toxicol 2015; 118:208-13. [PMID: 26348780 DOI: 10.1111/bcpt.12488] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Accepted: 08/31/2015] [Indexed: 11/28/2022]
Abstract
Annona vepretorum Mart. (Annonaceae), popularly known as 'bruteira', has nutritional and medicinal uses. This study investigated the chemical composition and antitumour potential of the essential oil of A. vepretorum leaf alone and complexed with β-cyclodextrin in a microencapsulation. The essential oil was obtained by hydrodistillation using a Clevenger-type apparatus and analysed using GC-MS and GC-FID. In vitro cytotoxicity of the essential oil and some of its major constituents in tumour cell lines from different histotypes was evaluated using the alamar blue assay. Furthermore, the in vivo efficacy of essential oil was demonstrated in mice inoculated with B16-F10 mouse melanoma. The essential oil included bicyclogermacrene (35.71%), spathulenol (18.89%), (E)-β-ocimene (12.46%), α-phellandrene (8.08%), o-cymene (6.24%), germacrene D (3.27%) and α-pinene (2.18%) as major constituents. The essential oil and spathulenol exhibited promising cytotoxicity. In vivo tumour growth was inhibited by the treatment with the essential oil (inhibition of 34.46%). Importantly, microencapsulation of the essential oil increased in vivo tumour growth inhibition (inhibition of 62.66%).
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Affiliation(s)
- Larissa M Bomfim
- Gonçalo Moniz Research Center, Oswaldo Cruz Foundation (CPqGM-FIOCRUZ/BA), Salvador, Brazil
| | | | | | - Rosane B Dias
- Gonçalo Moniz Research Center, Oswaldo Cruz Foundation (CPqGM-FIOCRUZ/BA), Salvador, Brazil
| | - Clarissa A Gurgel Rocha
- Gonçalo Moniz Research Center, Oswaldo Cruz Foundation (CPqGM-FIOCRUZ/BA), Salvador, Brazil.,Department of Propedeutics, Federal University of Bahia, Salvador, Brazil
| | - Milena B P Soares
- Gonçalo Moniz Research Center, Oswaldo Cruz Foundation (CPqGM-FIOCRUZ/BA), Salvador, Brazil.,Center of Biotechnology and Cell Therapy, Hospital São Rafael, Salvador, Brazil
| | | | | | - Adriana F Campos
- Northeastern Center for Strategic Technologies (CETENE), Recife, Brazil
| | | | - Emmanoel V Costa
- Department of Chemistry, Federal University of Amazonas, Manaus, Brazil
| | - Daniel P Bezerra
- Gonçalo Moniz Research Center, Oswaldo Cruz Foundation (CPqGM-FIOCRUZ/BA), Salvador, Brazil
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Abstract
This study was undertaken to evaluate the prevalence of GB virus C (GBV-C) viraemia and anti-E2 antibody, and to assess the effect of co-infection with GBV-C and HIV during a 10-year follow-up of a cohort of 248 HIV-infected women. Laboratory variables (mean and median CD4 counts, and HIV and GBV-C viral loads) and clinical parameters were investigated. At baseline, 115 women had past exposure to GBV-C: 57 (23%) were GBV-C RNA positive and 58 (23%) were anti-E2 positive. There was no statistical difference between the groups (GBV-C RNA + /anti-E2 − , GBV-C RNA − /anti-E2 + and GBV-C RNA − /anti-E2 − ) regarding baseline CD4 counts or HIV viral loads ( P = 0.360 and 0.713, respectively). Relative risk of death for the GBV-C RNA + /anti-E2 − group was 63% lower than that for the GBV-C RNA − /anti-E2 − group. Multivariate analysis demonstrated that only HIV loads ≥ 100,000 copies/mL and AIDS-defining illness during follow-up were associated with shorter survival after AIDS development. It is likely that antiretroviral therapy (ART) use in our cohort blurred a putative protective effect related to the presence of GBV-C RNA.
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Affiliation(s)
- A F Campos
- Department of Infectious Diseases, School of Medicine
| | - F M Tengan
- Department of Infectious Diseases, School of Medicine
| | - S A A Silva
- Virology Lab, Institute of Tropical Medicine, University of São Paulo, São Paulo, Brazil
| | - J E Levi
- Virology Lab, Institute of Tropical Medicine, University of São Paulo, São Paulo, Brazil
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Abstract
Published studies on the association between cancer and paracoccidioidomycosis consist either isolated cases or clinical data based on hospital cohorts of paracoccidioidomycosis. The frequency of neoplasia in series of > or = 80 patients with paracoccidioidomycosis ranges from 0.16 to 14.1%, mean of 3.96%. There are only two retrospective controlled studies, one of them showing greater incidence of carcinoma in biopsy and necropsy samples of paracoccidioidomycosis (12 cases in 147 patients with the mycosis: 8.2%) than in the necropsies of the control group (320 cases in 7,302 necropsies: 4.9%). In the other, 22,409 autopsies were reviewed and 4,372 cases of cancer were found; of the 85 patients with paracoccidioidomycosis, 12 were diagnosed with cancer. No differences were observed in the frequency of malignancies between the group of patients with paracoccidioidomycosis (14.1%) and the control group (19.5%). Considering all the reported cases, carcinoma was more frequent than hematological malignancies, and was more often found at the same site or in a neighboring site affected by the mycosis, usually occurring after the diagnosis of the mycosis. Commonly, the basic cause of death was related to secondary infections or neoplasia. Lymphoma was associated with poorly organized rich in fungi granuloma. The clinical course and mortality were related to the cancer evolution or secondary infections and was worse in lymphoid series, metastatic carcinoma or in patients under cytotoxic chemotherapy. Additionally, as in several cases the clinical and histopathological data may mimick neoplasia, the correct diagnosis of both diseases is essential to guarantee an early and safe intervention.
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Affiliation(s)
- M A Shikanai-Yasuda
- Infectious and Parasitic Disease Dept., Laboratório de Investigação Médica em Imunologia do, Hospital das Clínica, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brasil.
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