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Pereira JM, Mendes JP, Dias B, Almeida JMMMD, Coelho LCC. Optical pH Sensor Based on a Long-Period Fiber Grating Coated with a Polymeric Layer-by-Layer Electrostatic Self-Assembled Nanofilm. Sensors (Basel) 2024; 24:1662. [PMID: 38475198 DOI: 10.3390/s24051662] [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: 11/30/2023] [Revised: 02/16/2024] [Accepted: 03/02/2024] [Indexed: 03/14/2024]
Abstract
An optical fiber pH sensor based on a long-period fiber grating (LPFG) is reported. Two oppositely charged polymers, polyethylenimine (PEI) and polyacrylic acid (PAA), were alternately deposited on the sensing structure through a layer-by-layer (LbL) electrostatic self-assembly technique. Since the polymers are pH sensitive, their refractive index (RI) varies when the pH of the solution changes due to swelling/deswelling phenomena. The fabricated multilayer coating retained a similar property, enabling its use in pH-sensing applications. The pH of the PAA dipping solution was tuned so that a coated LPFG achieved a pH sensitivity of (6.3 ± 0.2) nm/pH in the 5.92-9.23 pH range. Only two bilayers of PEI/PAA were used as an overlay, which reduces the fabrication time and increases the reproducibility of the sensor, and its reversibility and repeatability were demonstrated by tracking the resonance band position throughout multiple cycles between different pH solutions. With simulation work and experimental results from a low-finesse Fabry-Perot (FP) cavity on a fiber tip, the coating properties were estimated. When saturated at low pH, it has a thickness of 200 nm and 1.53 ± 0.01 RI, expanding up to 310 nm with a 1.35 ± 0.01 RI at higher pH values, mostly due to the structural changes in the PAA.
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Affiliation(s)
- José M Pereira
- INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, Rua Dr. Alberto Frias, 4200-465 Porto, Portugal
- Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - João P Mendes
- INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, Rua Dr. Alberto Frias, 4200-465 Porto, Portugal
| | - Bernardo Dias
- INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, Rua Dr. Alberto Frias, 4200-465 Porto, Portugal
- Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - José M M M de Almeida
- INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, Rua Dr. Alberto Frias, 4200-465 Porto, Portugal
- School of Sciences and Technology, University of Trás-os-Montes e Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal
| | - Luís C C Coelho
- INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, Rua Dr. Alberto Frias, 4200-465 Porto, Portugal
- Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
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Dias BS, de Almeida JMMM, Coelho LCC. Refractometric sensitivity of Bloch surface waves: perturbation theory calculation and experimental validation. Opt Lett 2023; 48:727-730. [PMID: 36723574 DOI: 10.1364/ol.481176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 01/02/2023] [Indexed: 06/18/2023]
Abstract
The sensitivity of one-dimensional Bloch surface wave (BSW) sensors to external refractive index variations using Kretschmann's configuration is calculated analytically by employing first-order perturbation theory for both TE and TM modes. This approach is then validated by comparison with both transfer matrix method simulations and experimental results for a chosen photonic crystal structure. Experimental sensitivities of (8.4±0.2)×102 and (8.4±0.4)×102 nm/RIU were obtained for the TE and TM BSW modes, corresponding to errors of 0.02% and 4%, respectively, when comparing with the perturbation theory approach. These results provide interesting insights into photonic crystal design for Bloch surface wave sensing by casting light into the important parameters related with sensor performance.
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S. S. dos Santos P, M. M. M. de Almeida J, Pastoriza-Santos I, C. C. Coelho L. Advances in Plasmonic Sensing at the NIR-A Review. Sensors (Basel) 2021; 21:2111. [PMID: 33802958 PMCID: PMC8002678 DOI: 10.3390/s21062111] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/04/2021] [Accepted: 03/12/2021] [Indexed: 11/21/2022]
Abstract
Surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) are among the most common and powerful label-free refractive index-based biosensing techniques available nowadays. Focusing on LSPR sensors, their performance is highly dependent on the size, shape, and nature of the nanomaterial employed. Indeed, the tailoring of those parameters allows the development of LSPR sensors with a tunable wavelength range between the ultra-violet (UV) and near infra-red (NIR). Furthermore, dealing with LSPR along optical fiber technology, with their low attenuation coefficients at NIR, allow for the possibility to create ultra-sensitive and long-range sensing networks to be deployed in a variety of both biological and chemical sensors. This work provides a detailed review of the key science underpinning such systems as well as recent progress in the development of several LSPR-based biosensors in the NIR wavelengths, including an overview of the LSPR phenomena along recent developments in the field of nanomaterials and nanostructure development towards NIR sensing. The review ends with a consideration of key advances in terms of nanostructure characteristics for LSPR sensing and prospects for future research and advances in this field.
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Affiliation(s)
- Paulo S. S. dos Santos
- INESC TEC—Institute for Systems and Computer Engineering, Technology and Science, and Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal;
- Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - José M. M. M. de Almeida
- Department of Physics, School of Science and Technology, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal;
| | - Isabel Pastoriza-Santos
- CINBIO, Universidade de Vigo, Campus Universitario Lagoas, Marcosende, 36310 Vigo, Spain;
- SERGAS-UVIGO, Galicia Sur Health Research Institute (IIS Galicia Sur), 36312 Vigo, Spain
| | - Luís C. C. Coelho
- INESC TEC—Institute for Systems and Computer Engineering, Technology and Science, and Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal;
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Vasconcelos H, Coelho LCC, Matias A, Saraiva C, Jorge PAS, de Almeida JMMM. Biosensors for Biogenic Amines: A Review. Biosensors (Basel) 2021; 11:bios11030082. [PMID: 33805834 PMCID: PMC8000219 DOI: 10.3390/bios11030082] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Revised: 03/08/2021] [Accepted: 03/09/2021] [Indexed: 01/11/2023]
Abstract
Biogenic amines (BAs) are well-known biomolecules, mostly for their toxic and carcinogenic effects. Commonly, they are used as an indicator of quality preservation in food and beverages since their presence in higher concentrations is associated with poor quality. With respect to BA’s metabolic pathways, time plays a crucial factor in their formation. They are mainly formed by microbial decarboxylation of amino acids, which is closely related to food deterioration, therefore, making them unfit for human consumption. Pathogenic microorganisms grow in food without any noticeable change in odor, appearance, or taste, thus, they can reach toxic concentrations. The present review provides an overview of the most recent literature on BAs with special emphasis on food matrixes, including a description of the typical BA assay formats, along with its general structure, according to the biorecognition elements used (enzymes, nucleic acids, whole cells, and antibodies). The extensive and significant amount of research that has been done to the investigation of biorecognition elements, transducers, and their integration in biosensors, over the years has been reviewed.
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Affiliation(s)
- Helena Vasconcelos
- School of Agrarian and Veterinary Sciences, University of Trás-os-Montes and Alto Douro, 5001-801 Vila Real, Portugal; (H.V.); (C.S.)
- INESC TEC—Institute for Systems and Computer Engineering, Technology and Science and Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal; (L.C.C.C.); (A.M.); (P.A.S.J.)
| | - Luís C. C. Coelho
- INESC TEC—Institute for Systems and Computer Engineering, Technology and Science and Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal; (L.C.C.C.); (A.M.); (P.A.S.J.)
| | - Ana Matias
- INESC TEC—Institute for Systems and Computer Engineering, Technology and Science and Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal; (L.C.C.C.); (A.M.); (P.A.S.J.)
| | - Cristina Saraiva
- School of Agrarian and Veterinary Sciences, University of Trás-os-Montes and Alto Douro, 5001-801 Vila Real, Portugal; (H.V.); (C.S.)
| | - Pedro A. S. Jorge
- INESC TEC—Institute for Systems and Computer Engineering, Technology and Science and Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal; (L.C.C.C.); (A.M.); (P.A.S.J.)
- Department. of Physics and Astronomy, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
| | - José M. M. M. de Almeida
- INESC TEC—Institute for Systems and Computer Engineering, Technology and Science and Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal; (L.C.C.C.); (A.M.); (P.A.S.J.)
- Department of Physics, School of Science and Technology, University of Trás-os-Montes and Alto Douro, 5001-801 Vila Real, Portugal
- Correspondence:
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Viveiros D, de Almeida JMMM, Coelho L, Vasconcelos H, Maia JM, Amorim VA, Jorge PAS, Marques PVS. Temperature Stability and Spectral Tuning of Long Period Fiber Gratings Fabricated by Femtosecond Laser Direct Writing. Sensors (Basel) 2020; 20:s20143898. [PMID: 32668738 PMCID: PMC7412330 DOI: 10.3390/s20143898] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 07/08/2020] [Accepted: 07/09/2020] [Indexed: 11/16/2022]
Abstract
Long period fiber gratings (LPFGs) were fabricated in a standard single mode fiber (SMF-28e) through femtosecond (fs) laser direct writing. LPFGs with longer and shorter periods were fabricated, which allows coupling from the fundamental core mode to lower and higher order asymmetric cladding modes (LP1,6 and LP1,12, respectively). For the grating periods of 182.7 and 192.5 µm, it was verified that the LP1,12 mode exhibits a TAP at approximately 1380 and 1448 nm in air and water, respectively. Characterization of the LPFGs subjected to high-temperature thermal treatment was accomplished. Fine-tuning of the resonance band’s position and thermal stability up to 600 °C was shown. The temperature sensitivity was characterized for the gratings with different periods and for different temperature ranges. A maximum sensitivity of −180.73, and 179.29 pm/°C was obtained for the two resonances of the 182.7 µm TAP LPFG, in the range between 250 and 600 °C.
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Affiliation(s)
- Duarte Viveiros
- Center for Applied Photonics, INESC TEC, 4200-465 Porto, Portugal; (J.M.M.M.d.A.); (L.C.); (H.V.); (J.M.M.); (V.A.A.); (P.A.S.J.); (P.V.S.M.)
- Department of Physics and Astronomy, Faculty of Science, University of Porto, 4169-007 Porto, Portugal
- Correspondence: ; Tel.: +351-22-040-2301
| | - José M. M. M. de Almeida
- Center for Applied Photonics, INESC TEC, 4200-465 Porto, Portugal; (J.M.M.M.d.A.); (L.C.); (H.V.); (J.M.M.); (V.A.A.); (P.A.S.J.); (P.V.S.M.)
- Department of Physics, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
| | - Luís Coelho
- Center for Applied Photonics, INESC TEC, 4200-465 Porto, Portugal; (J.M.M.M.d.A.); (L.C.); (H.V.); (J.M.M.); (V.A.A.); (P.A.S.J.); (P.V.S.M.)
| | - Helena Vasconcelos
- Center for Applied Photonics, INESC TEC, 4200-465 Porto, Portugal; (J.M.M.M.d.A.); (L.C.); (H.V.); (J.M.M.); (V.A.A.); (P.A.S.J.); (P.V.S.M.)
- Department of Physics, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
| | - João M. Maia
- Center for Applied Photonics, INESC TEC, 4200-465 Porto, Portugal; (J.M.M.M.d.A.); (L.C.); (H.V.); (J.M.M.); (V.A.A.); (P.A.S.J.); (P.V.S.M.)
- Department of Physics and Astronomy, Faculty of Science, University of Porto, 4169-007 Porto, Portugal
| | - Vítor A. Amorim
- Center for Applied Photonics, INESC TEC, 4200-465 Porto, Portugal; (J.M.M.M.d.A.); (L.C.); (H.V.); (J.M.M.); (V.A.A.); (P.A.S.J.); (P.V.S.M.)
- Department of Physics and Astronomy, Faculty of Science, University of Porto, 4169-007 Porto, Portugal
| | - Pedro A. S. Jorge
- Center for Applied Photonics, INESC TEC, 4200-465 Porto, Portugal; (J.M.M.M.d.A.); (L.C.); (H.V.); (J.M.M.); (V.A.A.); (P.A.S.J.); (P.V.S.M.)
- Department of Physics and Astronomy, Faculty of Science, University of Porto, 4169-007 Porto, Portugal
| | - Paulo V. S. Marques
- Center for Applied Photonics, INESC TEC, 4200-465 Porto, Portugal; (J.M.M.M.d.A.); (L.C.); (H.V.); (J.M.M.); (V.A.A.); (P.A.S.J.); (P.V.S.M.)
- Department of Physics and Astronomy, Faculty of Science, University of Porto, 4169-007 Porto, Portugal
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de Almeida JMMM, Vasconcelos H, Jorge PAS, Coelho L. Plasmonic Optical Fiber Sensor Based on Double Step Growth of Gold Nano-Islands. Sensors (Basel) 2018; 18:s18041267. [PMID: 29677108 PMCID: PMC5948548 DOI: 10.3390/s18041267] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Revised: 04/17/2018] [Accepted: 04/18/2018] [Indexed: 01/09/2023]
Abstract
It is presented the fabrication and characterization of optical fiber sensors for refractive index measurement based on localized surface plasmon resonance (LSPR) with gold nano-islands obtained by single and by repeated thermal dewetting of gold thin films. Thin films of gold deposited on silica (SiO₂) substrates and produced by different experimental conditions were analyzed by Scanning Electron Microscope/Dispersive X-ray Spectroscopy (SEM/EDS) and optical means, allowing identifying and characterizing the formation of nano-islands. The wavelength shift sensitivity to the surrounding refractive index of sensors produced by single and by repeated dewetting is compared. While for the single step dewetting, a wavelength shift sensitivity of ~60 nm/RIU was calculated, for the repeated dewetting, a value of ~186 nm/RIU was obtained, an increase of more than three times. It is expected that through changing the fabrication parameters and using other fiber sensor geometries, higher sensitivities may be achieved, allowing, in addition, for the possibility of tuning the plasmonic frequency.
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Affiliation(s)
- José M M M de Almeida
- CAP/INESC TEC-Technology and Science and FCUP-Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal.
- Department of Physics, School of Sciences and Technology, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal.
| | - Helena Vasconcelos
- CAP/INESC TEC-Technology and Science and FCUP-Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal.
| | - Pedro A S Jorge
- CAP/INESC TEC-Technology and Science and FCUP-Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal.
| | - Luis Coelho
- CAP/INESC TEC-Technology and Science and FCUP-Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal.
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Sousa N, Moreira MJ, Saraiva C, de Almeida JMMM. Applying Fourier Transform Mid Infrared Spectroscopy to Detect the Adulteration of Salmo salar with Oncorhynchus mykiss. Foods 2018; 7:foods7040055. [PMID: 29621135 PMCID: PMC5920420 DOI: 10.3390/foods7040055] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 04/02/2018] [Accepted: 04/03/2018] [Indexed: 11/28/2022] Open
Abstract
The aim of this study was to evaluate the potential of Fourier transform infrared (FTIR) spectroscopy coupled with chemometric methods to detect fish adulteration. Muscles of Atlantic salmon (Salmo salar) (SS) and Salmon trout (Onconrhynchus mykiss) (OM) muscles were mixed in different percentages and transformed into mini-burgers. These were stored at 3 °C, then examined at 0, 72, 160, and 240 h for deteriorative microorganisms. Mini-burgers was submitted to Soxhlet extraction, following which lipid extracts were analyzed by FTIR. The principal component analysis (PCA) described the studied adulteration using four principal components with an explained variance of 95.60%. PCA showed that the absorbance in the spectral region from 721, 1097, 1370, 1464, 1655, 2805, to 2935, 3009 cm−1 may be attributed to biochemical fingerprints related to differences between SS and OM. The partial least squares regression (PLS-R) predicted the presence/absence of adulteration in fish samples of an external set with high accuracy. The proposed methods have the advantage of allowing quick measurements, despite the storage time of the adulterated fish. FTIR combined with chemometrics showed that a methodology to identify the adulteration of SS with OM can be established, even when stored for different periods of time.
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Affiliation(s)
- Nuno Sousa
- School of Agrarian and Veterinary Sciences, CECAV, University of Trás-os-Montes e Alto Douro, Quinta de Prados, B. Laboratorial, B1.03, 5001-801 Vila Real, Portugal.
| | - Maria João Moreira
- School of Agrarian and Veterinary Sciences, CECAV, University of Trás-os-Montes e Alto Douro, Quinta de Prados, B. Laboratorial, B1.03, 5001-801 Vila Real, Portugal.
| | - Cristina Saraiva
- School of Agrarian and Veterinary Sciences, CECAV, University of Trás-os-Montes e Alto Douro, Quinta de Prados, B. Laboratorial, B1.03, 5001-801 Vila Real, Portugal.
| | - José M M M de Almeida
- Physics Department, School of Sciences and Technology, University of Trás-os-Montes e Alto Douro, Quinta do Prados, 5001-801 Vila Real, Portugal.
- CAP/INESC TEC-Technology and Science and FCUP-Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal.
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Gouveia AR, Alves M, de Almeida JMMM, Monteiro-Silva F, González-Aguilar G, Silva JA, Saraiva C. The Antimicrobial Effect of Essential Oils AgainstListeria monocytogenesinSous videCook-Chill Beef during Storage. J FOOD PROCESS PRES 2016. [DOI: 10.1111/jfpp.13066] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ana R. Gouveia
- Department of Veterinary Sciences, School of Agrarian and Veterinary Sciences; CECAV, University of Trás-os-Montes e Alto Douro; Bl. Lab, B1.03 Vila Real 5001-801 Portugal
| | - Márcio Alves
- Department of Veterinary Sciences, School of Agrarian and Veterinary Sciences; CECAV, University of Trás-os-Montes e Alto Douro; Bl. Lab, B1.03 Vila Real 5001-801 Portugal
| | - José M. M. M. de Almeida
- Department of Physics, School of Sciences and Technology; University of Trás-os-Montes e Alto Douro; Vila Real Portugal
- Centre for Applied Photonics, INESC TEC, Faculty of Sciences of University of Porto; Porto Portugal
| | - Filipe Monteiro-Silva
- Centre for Applied Photonics, INESC TEC, Faculty of Sciences of University of Porto; Porto Portugal
| | - Gerardo González-Aguilar
- Centre for Applied Photonics, INESC TEC, Faculty of Sciences of University of Porto; Porto Portugal
| | - José A. Silva
- Department of Veterinary Sciences, School of Agrarian and Veterinary Sciences; CECAV, University of Trás-os-Montes e Alto Douro; Bl. Lab, B1.03 Vila Real 5001-801 Portugal
| | - Cristina Saraiva
- Department of Veterinary Sciences, School of Agrarian and Veterinary Sciences; CECAV, University of Trás-os-Montes e Alto Douro; Bl. Lab, B1.03 Vila Real 5001-801 Portugal
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Machado M, Machado N, Gouvinhas I, Cunha M, de Almeida JMMM, Barros AIRNA. Quantification of Chemical Characteristics of Olive Fruit and Oil of cv Cobrançosa in Two Ripening Stages Using MIR Spectroscopy and Chemometrics. FOOD ANAL METHOD 2014. [DOI: 10.1007/s12161-014-0017-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Vasconcelos H, Saraiva C, de Almeida JMMM. Evaluation of the Spoilage of Raw Chicken Breast Fillets Using Fourier Transform Infrared Spectroscopy in Tandem with Chemometrics. FOOD BIOPROCESS TECH 2014. [DOI: 10.1007/s11947-014-1277-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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