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Tsuchida K, Imoto Y, Saito T, Hara J, Kawabe Y. A novel and simple method for measuring nano/microplastic concentrations in soil using UV-Vis spectroscopy with optimal wavelength selection. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 280:116366. [PMID: 38806335 DOI: 10.1016/j.ecoenv.2024.116366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 03/27/2024] [Accepted: 04/20/2024] [Indexed: 05/30/2024]
Abstract
A simple method for measuring the concentration of nano/microplastics (N/MPs) in soil, which is difficult owing to the size of the filter mesh and the resolution of the measuring instrument, was investigated. A spectrophotometer was used for the measurements and polystyrene particles were used as the N/MP samples. When measuring N/MP concentrations in soil suspensions, absorbance was measured at two wavelengths, and the best combination of wavelengths for measurement was extracted because soil particles and leached components interfere with N/MP absorbance. A wavelength combination of 220-260 nm and 280-340 nm was found to be suitable for a variety of soils. As N/MPs are adsorbed on the surface of soil particles and precipitate with soil particles in suspension, a calibration curve was created between the concentration of N/MPs in the soil suspension and the N/MP content in the soil. The calibration curve showed a linear relationship, allowing for the estimation of the concentration of N/MPs in the soil. Although other N/MP materials, such as polyethylene and polyethylene terephthalate, must also still be considered and tested, this simple method has the potential to measure N/MPs in various types of soil.
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Affiliation(s)
- Kyouhei Tsuchida
- National Institute of Advanced Industrial Science and Technology (AIST) Central7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan; Department of Resources and Environmental Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
| | - Yukari Imoto
- National Institute of Advanced Industrial Science and Technology (AIST) Central7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
| | - Takeshi Saito
- National Institute of Advanced Industrial Science and Technology (AIST) Central7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
| | - Junko Hara
- National Institute of Advanced Industrial Science and Technology (AIST) Central7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
| | - Yoshishige Kawabe
- Department of Resources and Environmental Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
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2
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Huang PL, Lo YL, Chen YR, Liu CY. Mueller matrix polarimetry approach for noninvasive glucose sensing with absorbance and anisotropic parameters on fingertips. JOURNAL OF BIOPHOTONICS 2024:e202400052. [PMID: 38952197 DOI: 10.1002/jbio.202400052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 06/10/2024] [Accepted: 06/10/2024] [Indexed: 07/03/2024]
Abstract
A Mueller matrix polarimetry system at 532 nm wavelength is developed for noninvasive glucose sensing in turbid media such as human's fingertip. The system extracts mean absorbance and anisotropic properties, demonstrated numerically and experimentally with phantom glucose samples. It is found that mean absorbance (A e $$ {A}_e $$ ), depolarization index (Δ), and linear dichroism (LD) show linear variation with glucose concentration 100-500 mg/dL. In addition, LightTools simulations indicate proportional scaling of scattering effects withA e $$ {A}_e $$ , Δ, and LD. Real-world tests on fingertip show a strong correlation between these properties and blood glucose levels with a mean absolute relative deviation (MARD) of 12.56% and a correlation coefficient (R2) of 0.875 in prediction by a neural network (NN) model, highlighting the advantages of Mueller matrix in extracting more parameters related to blood glucose.
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Affiliation(s)
- Po-Ling Huang
- Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan
| | - Yu-Lung Lo
- Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan
- Academy of Innovative Semiconductor and Sustainable Manufacturing, National Cheng Kung University, Tainan, Taiwan
| | - Yu-Ren Chen
- Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan
| | - Chih-Yi Liu
- Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan
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3
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Estrela Filho OA, Rivadeneira-Mendoza BF, Fernández-Andrade KJ, Zambrano-Intriago LA, Fred da Silva F, Luque R, Curbelo FD, Rodríguez-Díaz JM. Imidazolate framework material for crude oil removal in aqueus media: Mechanism insight. ENVIRONMENTAL RESEARCH 2024; 241:117680. [PMID: 37980984 DOI: 10.1016/j.envres.2023.117680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 10/04/2023] [Accepted: 11/14/2023] [Indexed: 11/21/2023]
Abstract
Considerable amount of produced water discharged by the oil industry contributes to an environmental imbalance due to the presence of several components potentially harmful to the ecosystem. We investigated the factors influencing the adsorption capacity of Zinc Imidazolate Framework-8 (ZIF-8) in finite bath systems for crude oil removal from petroleum extraction in synthetic produced water. ZIF-8, experimentally obtained by solvothermal method, was characterized by XRD, FTIR, TGA, BET and its point of zero charge (pHpcz) was determined. Synthesized material showed high crystallinity, with surface area equal to 1558 m2 g-1 and thermal stability equivalent to 400 °C. Adsorption tests revealed, based on the Sips model, that the process takes place in a heterogeneous system. Additionally, intraparticle diffusion model exhibited multilinearity characteristics during adsorption process. Thermodynamic investigation demonstrated that adsorption process is spontaneous and exothermic, indicating a physisorption phenomenon. These properties enable the use of ZIF-8 in oil adsorption, which presented an adsorption capacity equal to 452.9 mg g-1. Adsorption mechanism was based on hydrophobic interactions, through apolar groups present on ZIF-8 structure and oil hydrocarbons, and electrostatic interactions, through the difference in charges between positive surface of adsorbent and negatively charged oil droplets.
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Affiliation(s)
- Otoniel Anacleto Estrela Filho
- Programa de Pós-Graduação em Engenharia Química, Universidade Federal da Paraíba, Cidade Universitária, 58051-900, João Pessoa, Brazil
| | - Bryan Fernando Rivadeneira-Mendoza
- Laboratorio de Análisis Químicos y Biotecnológicos, Instituto de Investigación, Universidad Técnica de Manabí, S/N, Avenida Urbina y Che Guevara, Portoviejo, 130104, Ecuador
| | - Kevin Jhon Fernández-Andrade
- Laboratorio de Análisis Químicos y Biotecnológicos, Instituto de Investigación, Universidad Técnica de Manabí, S/N, Avenida Urbina y Che Guevara, Portoviejo, 130104, Ecuador; Laboratory of Gas Chromatography and Analytical Pyrolysis, Fac. of Engineering, Universidad del Bío-Bío (UBB), Concepción, Chile
| | - Luis Angel Zambrano-Intriago
- Laboratorio de Análisis Químicos y Biotecnológicos, Instituto de Investigación, Universidad Técnica de Manabí, S/N, Avenida Urbina y Che Guevara, Portoviejo, 130104, Ecuador
| | - Fausthon Fred da Silva
- Departamento de Química, Universidade Federal da Paraíba (UFPB), 58051-900, João Pessoa, PB, Brazil
| | - Rafael Luque
- Peoples Friendship University of Russia (RUDN University), 6 Miklukho Maklaya str., 117198, Moscow, Russian Federation; Universidad ECOTEC, Km. 13.5 Samborondón, Samborondón, EC092302, Ecuador.
| | - Fabiola Ds Curbelo
- Programa de Pós-Graduação em Engenharia Química, Universidade Federal da Paraíba, Cidade Universitária, 58051-900, João Pessoa, Brazil
| | - Joan Manuel Rodríguez-Díaz
- Laboratorio de Análisis Químicos y Biotecnológicos, Instituto de Investigación, Universidad Técnica de Manabí, S/N, Avenida Urbina y Che Guevara, Portoviejo, 130104, Ecuador.
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Arndt JH, Macko T, Vanderfeesten J, Verhoogt H, Brüll R. Characterizing graft distribution in maleic anhydride grafted polyethylene - GPC with IR and UV-detection. J Chromatogr A 2024; 1714:464557. [PMID: 38065028 DOI: 10.1016/j.chroma.2023.464557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 11/30/2023] [Accepted: 12/01/2023] [Indexed: 01/05/2024]
Abstract
As commodity plastics, polyolefins are in high demand and used in innumerable applications. An important reason for their success-story is their high versatility in terms of applications. The application range of polyolefins was significantly extended through the development of functionalization. A common functionalization for improving the compatibility of polyolefins with more polar polymers and surfaces is grafting with maleic anhydride. While maleic anhydride-grafted polyolefins have found widespread application, methods for their characterization remain rudimentary compared to the developments seen in the structural characterization of polyolefins in general. Herein, we propose two new approaches for determining the degree of functionalization as a function of the molar mass of maleic anhydride grafted polyolefins. On the one hand, the latest generation bandpass filter-based IR detectors are shown to be sensitive to the carbonyl moiety of MAH. After optimization of analysis conditions, the relation between MAH content and molar mass could be unraveled in an easily applicable approach suitable for routine analysis. On the other hand, the high reactivity of MAH was leveraged in a tagging approach. By imidization with a UV chromophore, MAH distribution can be assessed by HT-GPC-UV with significantly higher sensitivity compared to HT-GPC-IR.
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Affiliation(s)
- Jan-Hendrik Arndt
- Fraunhofer Institute for Structural Durability and System Reliability LBF, Division Plastics, Department Material Analysis and Characterization, Schlossgartenstrasse 6, 64289, Darmstadt, Germany
| | - Tibor Macko
- Fraunhofer Institute for Structural Durability and System Reliability LBF, Division Plastics, Department Material Analysis and Characterization, Schlossgartenstrasse 6, 64289, Darmstadt, Germany
| | - Joep Vanderfeesten
- SABIC Technology & Innovation, STC Geleen, PO Box 319, 6160 AH Geleen, the Netherlands
| | - Henk Verhoogt
- SABIC Technology & Innovation, STC Geleen, PO Box 319, 6160 AH Geleen, the Netherlands
| | - Robert Brüll
- Fraunhofer Institute for Structural Durability and System Reliability LBF, Division Plastics, Department Material Analysis and Characterization, Schlossgartenstrasse 6, 64289, Darmstadt, Germany.
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Madadian Bozorg N, Leclercq M, Lescot T, Bazin M, Gaudreault N, Dikpati A, Fortin MA, Droit A, Bertrand N. Design of experiment and machine learning inform on the 3D printing of hydrogels for biomedical applications. BIOMATERIALS ADVANCES 2023; 153:213533. [PMID: 37392520 DOI: 10.1016/j.bioadv.2023.213533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 05/30/2023] [Accepted: 06/18/2023] [Indexed: 07/03/2023]
Abstract
In the biomedical field, 3D printing has the potential to deliver on some of the promises of personalized therapy, notably by enabling point-of-care fabrication of medical devices, dosage forms and bioimplants. To achieve this full potential, a better understanding of the 3D printing processes is necessary, and non-destructive characterization methods must be developed. This study proposes methodologies to optimize the 3D printing parameters for soft material extrusion. We hypothesize that combining image processing with design of experiment (DoE) analyses and machine learning could help obtaining useful information from a quality-by-design perspective. Herein, we investigated the impact of three critical process parameters (printing speed, printing pressure and infill percentage) on three critical quality attributes (gel weight, total surface area and heterogeneity) monitored with a non-destructive methodology. DoE and machine learning were combined to obtain information on the process. This work paves the way for a rational approach to optimize 3D printing parameters in the biomedical field.
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Affiliation(s)
- Neda Madadian Bozorg
- Faculté de Pharmacie, Centre de Recherche sur les Matériaux Avancés (CERMA), Université Laval, Quebec City, QC G1V 0A6, Canada; Centre de Recherche du CHU de Québec, Université Laval, Axe Endocrinologie et Néphrologie, Quebec City, QC G1V 4G2, Canada
| | - Mickael Leclercq
- Centre de Recherche du CHU de Québec, Université Laval, Axe Endocrinologie et Néphrologie, Quebec City, QC G1V 4G2, Canada
| | - Théophraste Lescot
- Faculté des Sciences et Génie, Département de Génie des Mines, de la Métallurgie et des Matériaux, Centre de Recherche sur les Matériaux Avancés (CERMA), Université Laval, Québec City G1V 0A6, Canada; Centre de Recherche du CHU de Québec, Université Laval, Axe Médecine Régénératrice, Quebec City, QC G1V 4G2, Canada
| | - Marc Bazin
- Centre de Recherche du CHU de Québec, Université Laval, Axe Neurosciences, Quebec City, QC G1V 4G2, Canada
| | - Nicolas Gaudreault
- Faculté de Pharmacie, Centre de Recherche sur les Matériaux Avancés (CERMA), Université Laval, Quebec City, QC G1V 0A6, Canada; Centre de Recherche du CHU de Québec, Université Laval, Axe Endocrinologie et Néphrologie, Quebec City, QC G1V 4G2, Canada
| | - Amrita Dikpati
- Faculté de Pharmacie, Centre de Recherche sur les Matériaux Avancés (CERMA), Université Laval, Quebec City, QC G1V 0A6, Canada; Centre de Recherche du CHU de Québec, Université Laval, Axe Endocrinologie et Néphrologie, Quebec City, QC G1V 4G2, Canada
| | - Marc-André Fortin
- Faculté des Sciences et Génie, Département de Génie des Mines, de la Métallurgie et des Matériaux, Centre de Recherche sur les Matériaux Avancés (CERMA), Université Laval, Québec City G1V 0A6, Canada; Centre de Recherche du CHU de Québec, Université Laval, Axe Médecine Régénératrice, Quebec City, QC G1V 4G2, Canada
| | - Arnaud Droit
- Centre de Recherche du CHU de Québec, Université Laval, Axe Endocrinologie et Néphrologie, Quebec City, QC G1V 4G2, Canada; Faculté de Médicine, Département de Médecine Moléculaire, Université Laval, Québec City G1V 0A6, Canada
| | - Nicolas Bertrand
- Faculté de Pharmacie, Centre de Recherche sur les Matériaux Avancés (CERMA), Université Laval, Quebec City, QC G1V 0A6, Canada; Centre de Recherche du CHU de Québec, Université Laval, Axe Endocrinologie et Néphrologie, Quebec City, QC G1V 4G2, Canada.
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6
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Eltagoury YM, Sabry YM, Khalil D. Polarized light diffuse reflectance FT-NIR MEMS spectrometer enabling the detection of powder samples through a thin plastic layer. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2023; 40:774-781. [PMID: 37132978 DOI: 10.1364/josaa.483402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Polarized scattered light Fourier transform infrared (FTIR) spectroscopy is used for measuring the absorbance of highly scattering materials overcoming the multiple scattering effect. It has been reported for in vivo for biomedical applications and in-field for agricultural and for environmental monitoring. In this paper, we report a polarized light microelectromechanical system (MEMS)-based FTIR in the extended near infrared (NIR) that utilizes a bistate polarizer in a diffuse reflectance measurement setup. The spectrometer is capable of distinguishing between single backscattering from the uppermost layer and multiple scattering from the deep layers. The spectrometer has a spectral resolution of 64c m -1 (about 16 nm at a wavelength of 1550 nm) and operates in the spectral range of 4347c m -1 to 7692c m -1 (1300 nm to 2300 nm). The technique implies de-embedding of the MEMS spectrometer polarization response by normalizing its effect; this is applied on three different samples: milk powder, sugar, and flour in plastic bags. The technique is examined on different scattering size particles. The scattering particles diameter's range is expected to vary from 10 µm to 400 µm. The absorbance spectra of the samples are extracted and compared to the direct diffuse reflectance measurements of the samples, showing good agreement. By using the proposed technique, the calculated error for the flour was decreased from 43.2% to 2.9% at 1935 nm wavelength. The wavelength error dependence is also reduced.
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7
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Ducanchez A, Ryckewaert M, Heran D, Bendoula R. Discriminating between Absorption and Scattering Effects in Complex Turbid Media by Coupling Polarized Light Spectroscopy with the Mueller Matrix Concept. SENSORS (BASEL, SWITZERLAND) 2022; 22:s22239355. [PMID: 36502053 PMCID: PMC9737932 DOI: 10.3390/s22239355] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/25/2022] [Accepted: 11/28/2022] [Indexed: 06/12/2023]
Abstract
The separation of the combined effects of absorption and scattering in complex media is a major issue for better characterization and prediction of media properties. In this study, an approach coupling polarized light spectroscopy and the Mueller matrix concept were evaluated to address this issue. A set of 50 turbid liquid optical phantoms with different levels of scattering and absorption properties were made and measured at various orientations of polarizers and analyzers to obtain the 16 elements of the complete Mueller matrix in the VIS-NIR region. Partial least square (PLS) was performed to build calibration models from diffuse reflectance spectra in order to evaluate the potential of polarization spectroscopy through the elements of the Mueller matrix to predict physical and chemical parameters and hence, to discriminate scattering and absorption effects, respectively. In particular, it was demonstrated that absorption and scattering effects can be distinguished in the Rayleigh regime with linear and circular polarization from the M22 and M44 elements of the Mueller matrix, correspondingly.
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Affiliation(s)
- Arnaud Ducanchez
- ITAP, University of Montpellier, INRAE, Institut Agro, 34060 Montpellier, France
| | | | - Daphne Heran
- ITAP, University of Montpellier, INRAE, 34196 Montpellier, France
| | - Ryad Bendoula
- ITAP, University of Montpellier, INRAE, 34196 Montpellier, France
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8
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Deshmukh S, Brüll R, Macko T, Arndt JH, Bernardo R, Niessen S. Characterization of ethylene-propylene-diene terpolymers using high-temperature size exclusion chromatography coupled with an ultraviolet detector. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.124585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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9
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Interactions of Linearly Polarized and Unpolarized Light on Kiwifruit Using Aquaphotomics. Molecules 2022; 27:molecules27020494. [PMID: 35056810 PMCID: PMC8780032 DOI: 10.3390/molecules27020494] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/10/2022] [Accepted: 01/10/2022] [Indexed: 11/26/2022] Open
Abstract
Near infrared (NIR) spectroscopy is an important tool for predicting the internal qualities of fruits. Using aquaphotomics, spectral changes between linearly polarized and unpolarized light were assessed on 200 commercially grown yellow-fleshed kiwifruit (Actinidia chinensis var. chinensis ‘Zesy002’). Measurements were performed on different configurations of unpeeled (intact) and peeled (cut) kiwifruit using a commercial handheld NIR instrument. Absorbance after applying standard normal variate (SNV) and second derivative Savitzky–Golay filters produced different spectral features for all configurations. An aquagram depicting all configurations suggests that linearly polarized light activated more free water states and unpolarized light activated more bound water states. At depth (≥1 mm), after several scattering events, all radiation is expected to be fully depolarized and interactions for incident polarized or unpolarized light will be similar, so any observed differences are attributable to the surface layers of the fruit. Aquagrams generated in terms of the fruit soluble solids content (SSC) were similar for all configurations, suggesting the SSC in fruit is not a contributing factor here.
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Mallet A, Pérémé M, Awhangbo L, Charnier C, Roger JM, Steyer JP, Latrille É, Bendoula R. Fast at-line characterization of solid organic waste: Comparing analytical performance of different compact near infrared spectroscopic systems with different measurement configurations. WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 126:664-673. [PMID: 33872975 DOI: 10.1016/j.wasman.2021.03.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/23/2021] [Accepted: 03/25/2021] [Indexed: 06/12/2023]
Abstract
Fast characterization of solid organic waste using near infrared spectroscopy has been successfully developed in the last decade. However, its adoption in biogas plants for monitoring the feeding substrates remains limited due to the lack of applicability and high costs. Recent evolutions in the technology have given rise to both more compact and more modular low-cost near infrared systems which could allow a larger scale deployment. The current study investigates the relevance of these new systems by evaluating four different Fourier transform near-infrared spectroscopic systems with different compactness (laboratory, portable, micro spectrometer) but also different measurement configurations (polarized light, at distance, in contact). Though the conventional laboratory spectrometer showed the best performance on the various biochemical parameters tested (carbohydrates, lipids, nitrogen, chemical oxygen demand, biochemical methane potential), the compact systems provided very close results. Prediction of the biochemical methane potential was possible using a low-cost micro spectrometer with an independent validation set error of only 91 NmL(CH4).gTS-1 compared to 60 NmL(CH4).gTS-1 for a laboratory spectrometer. The differences in performance were shown to result mainly from poorer spectral sampling; and not from instrument characteristics such as spectral resolution. Regarding the measurement configurations, none of the evaluated systems allowed a significant gain in robustness. In particular, the polarized light system provided better results when using its multi-scattered signal which brings further evidence of the importance of physical light-scattering properties in the success of models built on solid organic waste.
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Affiliation(s)
- Alexandre Mallet
- INRAE, Univ Montpellier, LBE, 102 Av des Etangs, Narbonne F-11100, France; INRAE, UMR ITAP, Montpellier University, Montpellier, France; Bioentech, F-11100 Narbonne, France; ChemHouse Research Group, Montpellier, France.
| | - Margaud Pérémé
- INRAE, Univ Montpellier, LBE, 102 Av des Etangs, Narbonne F-11100, France; ChemHouse Research Group, Montpellier, France
| | - Lorraine Awhangbo
- INRAE, Univ Montpellier, LBE, 102 Av des Etangs, Narbonne F-11100, France; ChemHouse Research Group, Montpellier, France
| | | | - Jean-Michel Roger
- INRAE, UMR ITAP, Montpellier University, Montpellier, France; ChemHouse Research Group, Montpellier, France
| | | | - Éric Latrille
- INRAE, Univ Montpellier, LBE, 102 Av des Etangs, Narbonne F-11100, France; ChemHouse Research Group, Montpellier, France
| | - Ryad Bendoula
- INRAE, UMR ITAP, Montpellier University, Montpellier, France
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11
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Modelling and Optimization of Processing Factors of Pumpkin Seeds Oil Extraction under Uniaxial Loading. Processes (Basel) 2021. [DOI: 10.3390/pr9030540] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In the present study, a Box–Behnken design of response surface methodology (RSM) was employed to optimize the processing factors (force: 100, 150, and 200 kN; speed: 3, 5, and 7 mm/min; and temperature: 40, 60, and 80 °C) for extracting pumpkin seeds oil under uniaxial compression. The design generated 15 experiments including twelve combinations of factors and three replicates at the center point. The responses: oil yield (%), oil expression efficiency (%), and energy (J) were calculated, and the regression models determined were statistically analyzed and validated. The optimum factors combination: 200 kN, 4 mm/min and 80 °C predicted the oil yield of 20.48%, oil expression efficiency of 60.90%, and energy of 848.04 J. The relaxation time of 12 min at the optimum factors increased the oil efficiency to 64.53%. The lower oil point force was determined to be 57.32 kN for estimating the maximum oil output. The tangent curve and generalized Maxwell models adequately (R2 = 0.996) described the compression and relaxation processes of pumpkin seeds oil extraction. Peroxide value increased with temperatures. The study provides detailed information useful for processing different bulk oilseeds under uniaxial loading for optimizing the mechanical oil pressing in large-scale oil production.
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Pan B, Pu J, Li T, Zhao M, Yang X. Online Noninvasive Assessment of Human Brain Death by Near-Infrared Spectroscopy with Protocol of O 2 Inspiration. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1269:347-352. [PMID: 33966241 DOI: 10.1007/978-3-030-48238-1_55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Brain death is the irreversible loss of all the functions of the brain and brainstem. Compared to traditional diagnostic methods of brain death, near-infrared spectroscopy (NIRS) is a noninvasive, objective, cost-effective, and safe way of assessment of brain death. Eighteen brain dead patients and 20 healthy subjects were studied by NIRS, with a multiple-phase protocol at varied fractions of inspired O2 (FIO2). We found that the changes in the concentration ratios of oxyhemoglobin to deoxyhemoglobin (Δ[HbO2]/Δ[Hb]) in the cerebral cortex of brain dead patients were significantly higher than those of healthy subjects, and its low-to-high FIO2 phase was most sensitive, with a recommended threshold in the range 1.40-1.50. Our study indicated that NIRS is a promising technology for assessing brain death. The success of this application potentially offers a supplementary technique for the assessment of brain death in real time in order to be able to promptly offer quality-assured donor organs.
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Affiliation(s)
- Boan Pan
- Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, P. R. China.,Science and Technology on Electronic Information Control Laboratory, Chengdu, P. R. China
| | - Jiangbo Pu
- Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, P. R. China
| | - Ting Li
- Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, P. R. China.
| | - Mingliang Zhao
- Department of Neurosurgery, Characteristic medical center of the Chinese People's Armed Police Force, Tianjin, P. R. China
| | - Xiping Yang
- Department of Neurosurgery, Characteristic medical center of the Chinese People's Armed Police Force, Tianjin, P. R. China
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13
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Application of Infrared Spectroscopy in Prediction of Asphalt Aging Time History and Fatigue Life. COATINGS 2020. [DOI: 10.3390/coatings10100959] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Based on attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy and principal component analysis (PCA), four kinds of asphalt (two kinds of matrix asphalts, TPC70# and JL70# and two kinds of modified asphalts, SBS-1 and SBS-2) were aged using the rolling thin-film oven test (RTFOT). The multiple stress repeated creep recovery test (MSCR) was carried out on an AR1500ex dynamic shear rheometer (DSR). The PCA was carried out on the attenuated total reflection infrared spectrum of a pretreated aged asphalt, the principal component factors (oxidation factor and component change factor) were determined, the comprehensive index F was calculated, and a prediction model of aging time history was established and verified. A prediction model for the aging asphalt recovery rate R was established based on the functional group index. The relationship between the recovery rate R and aging time history of each aging asphalt was analyzed and the fatigue life of each aging asphalt based on the rate of dissipated energy change (RDEC) was compared. The correlation between the comprehensive index F and fatigue life of asphalt was also analyzed. The results show that the order of resistance to the high-temperature deformation of each aging asphalt is as follows: SBS-2 > SBS-1 > TPC70# > JL70#; the prediction model of aging asphalt recovery rate R based on functional group index has good reliability. Taking the loading cycle corresponding to the sudden increase of the inflection point of the curve, i.e., the fatigue life NRDEC, as the evaluation index, the fatigue life order of each aging asphalt is SBS-1 > SBS-2 > JL70# > TPC70#. There is a positive correlation between the fatigue life of aged asphalt and the comprehensive index F of asphalt. The correlation degree R2 is 0.85; i.e., with the increase of the comprehensive index F of asphalt, its fatigue life also increases. It was found that it is feasible to analyze the aging time history and fatigue life of asphalt by infrared spectroscopy, and it can provide a rapid and non-destructive prediction method for the practical engineering application of asphalt.
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Héran D, Ryckewaert M, Abautret Y, Zerrad M, Amra C, Bendoula R. Combining light polarization and speckle measurements with multivariate analysis to predict bulk optical properties of turbid media. APPLIED OPTICS 2019; 58:8247-8256. [PMID: 31674502 DOI: 10.1364/ao.58.008247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 09/09/2019] [Indexed: 06/10/2023]
Abstract
This study aims to investigate the combination of speckle pattern analysis, polarization parameters, and chemometric tools to predict the optical absorption and scattering properties of materials. For this purpose, an optical setup based on light polarization and speckle measurements was developed, and turbid samples were measured at 405 and 660 nm. First, a backscattered polarized speckle acquisition was performed on a set of 41 samples with various scattering (${\mu}_s$μs) and absorbing (${{\mu}_a}$μa) coefficients. Then, several parameters were computed from the polarized speckle images, and prediction models were built using stepwise multiple linear regression. For scattering media, ${{\mu}_s}$μs was predicted with ${R^{2} = 0.9}$R2=0.9 using two parameters. In the case of scattering and absorbing media, prediction results using two parameters were ${R^{2} = 0.62}$R2=0.62 for ${{\mu}_s}$μs and ${R^{2} = 0.8}$R2=0.8 for ${{\mu}_a}$μa. The overall results obtained in this research showed that the combination of speckle pattern analysis, polarization parameters, and chemometric tools to predict the optical bulk properties of materials show interesting promise.
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15
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Chen H, Baitenov A, Li Y, Vasileva E, Popov S, Sychugov I, Yan M, Berglund L. Thickness Dependence of Optical Transmittance of Transparent Wood: Chemical Modification Effects. ACS APPLIED MATERIALS & INTERFACES 2019; 11:35451-35457. [PMID: 31483595 PMCID: PMC6776381 DOI: 10.1021/acsami.9b11816] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Accepted: 09/04/2019] [Indexed: 05/21/2023]
Abstract
Transparent wood (TW) is an emerging optical material combining high optical transmittance and haze for structural applications. Unlike nonscattering absorbing media, the thickness dependence of light transmittance for TW is complicated because optical losses are also related to increased photon path length from multiple scattering. In the present study, starting from photon diffusion equation, it is found that the angle-integrated total light transmittance of TW has an exponentially decaying dependence on sample thickness. The expression reveals an attenuation coefficient which depends not only on the absorption coefficient but also on the diffusion coefficient. The total transmittance and thickness were measured for a range of TW samples, from both acetylated and nonacetylated balsa wood templates, and were fitted according to the derived relationship. The fitting gives a lower attenuation coefficient for the acetylated TW compared to the nonacetylated one. The lower attenuation coefficient for the acetylated TW is attributed to its lower scattering coefficient or correspondingly lower haze. The attenuation constant resulted from our model hence can serve as a singular material parameter that facilitates cross-comparison of different sample types, at even different thicknesses, when total optical transmittance is concerned. The model was verified with two other TWs (ash and birch) and is in general applicable to other scattering media.
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Affiliation(s)
- Hui Chen
- Wallenberg Wood
Science Center, Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, Stockholm 100 44, Sweden
| | - Adil Baitenov
- Department of Applied Physics, School of Engineering
Sciences, KTH Royal Institute of Technology, Isafjordsgatan 22, Kista 164 40, Sweden
| | - Yuanyuan Li
- Wallenberg Wood
Science Center, Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, Stockholm 100 44, Sweden
| | - Elena Vasileva
- Department of Applied Physics, School of Engineering
Sciences, KTH Royal Institute of Technology, Isafjordsgatan 22, Kista 164 40, Sweden
| | - Sergei Popov
- Department of Applied Physics, School of Engineering
Sciences, KTH Royal Institute of Technology, Isafjordsgatan 22, Kista 164 40, Sweden
| | - Ilya Sychugov
- Department of Applied Physics, School of Engineering
Sciences, KTH Royal Institute of Technology, Isafjordsgatan 22, Kista 164 40, Sweden
- (I.S.)
| | - Max Yan
- Department of Applied Physics, School of Engineering
Sciences, KTH Royal Institute of Technology, Isafjordsgatan 22, Kista 164 40, Sweden
- (M.Y.)
| | - Lars Berglund
- Wallenberg Wood
Science Center, Department of Fiber and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, Stockholm 100 44, Sweden
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16
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Ducanchez A, Heran D, Bendoula R. Data on near infrared polarization spectroscopy measurements to evaluate the potential of the Mueller matrix elements in characterization of turbid liquid samples. Data Brief 2019; 23:103756. [PMID: 31372418 PMCID: PMC6660517 DOI: 10.1016/j.dib.2019.103756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 01/10/2019] [Accepted: 02/07/2019] [Indexed: 12/04/2022] Open
Abstract
In this article, a set of 50 turbid liquid samples with different levels of absorption and scattering properties were prepared and measured at various orientations of polarizers and analyzers to obtain the 16 elements of the complete Muller matrix. Partial Least Square (PLS) was used to build calibration models in order to assess the potential of polarization spectroscopy through the elements of Muller matrix to predict chemical and physical parameters.
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Affiliation(s)
- A Ducanchez
- Montpellier SupAgro, Irstea, Univ. Montpellier, UMR ITAP, 34060 Montpellier, France
| | - D Heran
- Montpellier SupAgro, Irstea, Univ. Montpellier, UMR ITAP, 34060 Montpellier, France
| | - R Bendoula
- Montpellier SupAgro, Irstea, Univ. Montpellier, UMR ITAP, 34060 Montpellier, France
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17
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Theint HT, Walsh JE, Wong ST, Voon K, Shitan M. Development of an optical biosensor for the detection of Trypanosoma evansi and Plasmodium berghei. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 218:348-358. [PMID: 31026712 DOI: 10.1016/j.saa.2019.04.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 04/05/2019] [Accepted: 04/06/2019] [Indexed: 06/09/2023]
Abstract
A laboratory prototype system that correlates murine blood absorbance with degree of infection for Plasmodium berghei and Trypanosoma avensi has been designed, constructed and tested. A population (n = 6) of control uninfected, Plasmodium infected and Trypanosoma infected BALB/c mice were developed and spectral absorption measurements pre and post infection were made every 3 days. A fibre optic spectrometer set-up was used as the basis of a laboratory prototype biosensor that uses the Beer Lambert Law to relate Ultraviolet-Visible-Near-infrared absorbance data to changes in murine blood chemistry post infection. Spectral absorption results indicate a statistically relevant correlation at a 650 nm with infection for Plasmodium from between 4 and 7 sampling days' post infection, in spite of significant standard deviations among the sample populations for control and infected mice. No significant spectral absorption change for Trypanosoma infection was been detected from the current data. Corresponding stained slides of control and infected blood at each sampling date were taken with related infected cell counts determined and these correlate well for Plasmodium absorbance at 650 nm.
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Affiliation(s)
- H T Theint
- Pathology Department, International Medical University, Kuala Lumpur, Malaysia
| | - J E Walsh
- Centre for Pre-University Studies, International Medical University, Kuala Lumpur, Malaysia.
| | - S T Wong
- Pathology Department, International Medical University, Kuala Lumpur, Malaysia
| | - K Voon
- Pathology Department, International Medical University, Kuala Lumpur, Malaysia
| | - M Shitan
- School of Mathematical and Computer Sciences, Heriot-Watt University, Putrajaya, Malaysia
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18
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Mäkinen E, Lassila L, Varrela J, Vallittu P. Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel. Biomater Investig Dent 2019; 6:6-12. [PMID: 31998868 PMCID: PMC6964775 DOI: 10.1080/26415275.2019.1632709] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 05/29/2019] [Indexed: 11/16/2022] Open
Abstract
Bonding properties of light-curing adhesive cured by transillumination through the tooth were compared to those achieved by the conventional technique. The study analyzed the degree of cure (DC%), debonding force (DF) and adhesive remnant index (ARI) when light was transmitted through dental hard tissues. Slices of dentin and enamel of 1 mm in thickness were combined with total thicknesses of 3 or 4 mm to simulate tooth structure without the pulp tissue. DC% with curing time of 20 s, 40 s and 60 s and irradiance power was measured for each group (n = 5). Brackets were bonded using transillumination on extracted incisors (n = 6) and premolars (n = 10), and DF was measured and ARI was scored. No statistical difference was found in light transmission between the simulated samples and incisors (p > .05). Increasing the curing time from 40 s to 60 s enhanced the DC% only in premolars (p < .05). An adequate DF was achieved through transillumination both in incisors and premolars, but in premolars, the DC% remained low compared to conventionally cured brackets. Most of the bracket failures resulted from weak bracket-adhesive bond.
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Affiliation(s)
- Erika Mäkinen
- Institute of Dentistry, University of Turku, Turku, Finland
| | - Lippo Lassila
- Turku Clinical Biomaterials Centre - TCBC, University of Turku, Turku, Finland
| | - Juha Varrela
- Department of Oral Development and Orthodontics, University of Turku, Turku, Finland.,Welfare Division, University of Turku, Turku, Finland
| | - Pekka Vallittu
- Turku Clinical Biomaterials Centre - TCBC, University of Turku, Turku, Finland.,Welfare Division, University of Turku, Turku, Finland.,Department of Biomaterials Science, University of Turku, Turku, Finland
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19
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Pan B, Huang C, Fang X, Huang X, Li T. Noninvasive and sensitive optical assessment of brain death. JOURNAL OF BIOPHOTONICS 2019; 12:e201800240. [PMID: 30379409 DOI: 10.1002/jbio.201800240] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 10/22/2018] [Accepted: 10/30/2018] [Indexed: 05/18/2023]
Abstract
Brain death is an irreversible loss of all brain functions, and the assessment is crucial for organ supply for transplantation. The noninvasive, sensitive, universally available and timely ancillary method to assess brain death has not been established. Here, we attempted to explore a noninvasive way in brain death assessment. Eighteen brain-dead patients and 20 healthy subjects were measured by near-infrared spectroscopy (NIRS), with a multiple-phase protocol at varied fraction of inspired O2 (FIO2 ). We found that the concentration changes ratios of oxyhemoglobin to deoxyhemoglobin (Δ[HbO2 ]/Δ[Hb]) in the cerebral cortex of brain-dead patients were significantly higher than those of healthy subjects. And, the Δ[HbO2 ]/Δ[Hb] in low-to-high FIO2 phase was most sensitive to distinguish brain-dead patients from healthy subjects, with a recommended threshold ranged in 1.40~1.50. The innovative incorporation of NIRS and a varied FIO2 protocol was shown to be a noninvasive and reliable way in assessing brain death. This successful attempt of NIRS application is a help for fast and accurate evaluation of brain death, promptly offering quality-assured donor organs and indicate us a protocol-aided way to expand the use of NIRS.
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Affiliation(s)
- Boan Pan
- Biomedical Engineering Institute, Chinese Academy of Medical Science and Peking Union Medical College, Tianjin, China
- State Key Lab Elect Thin Film & Integrated Device, University of Electronic Science and Technology of China, Chengdu, China
| | - Chong Huang
- Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky
| | - Xiang Fang
- Biomedical Engineering Institute, Chinese Academy of Medical Science and Peking Union Medical College, Tianjin, China
| | - Xiaobo Huang
- State Key Lab Elect Thin Film & Integrated Device, University of Electronic Science and Technology of China, Chengdu, China
| | - Ting Li
- Biomedical Engineering Institute, Chinese Academy of Medical Science and Peking Union Medical College, Tianjin, China
- State Key Lab Elect Thin Film & Integrated Device, University of Electronic Science and Technology of China, Chengdu, China
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Tolbin AY, Pushkarev VE, Tomilova LG. A mathematical analysis of deviations from linearity of Beer's law. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.06.056] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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21
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Liu A, Li G, Fu Z, Guan Y, Lin L. Non-linearity correction in NIR absorption spectra by grouping modeling according to the content of analyte. Sci Rep 2018; 8:8564. [PMID: 29867119 PMCID: PMC5986774 DOI: 10.1038/s41598-018-26802-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 05/15/2018] [Indexed: 02/02/2023] Open
Abstract
To correct the non-linearity caused by light scattering in quantitative analysis with near infrared absorption spectra, a new modeling analysis method was proposed: grouping modeling according to the content of analyte. In this study, we tested the proposed method for non-invasive detection of human hemoglobin (Hb) based on dynamic spectrum (DS). We compared the prediction performance of the proposed method with non-grouping modeling method. Experimental results showed that the root mean square error of the prediction set (RMSEP) by the proposed method was reduced by 9.96% and relative standard deviation of the prediction set (RSDP) was reduced by 4.73%. The results demonstrated that the proposed method could reduce the effects of non-linearity on the composition analysis by spectroscopy. This research provides a new method for correcting the non-linearity stemming from light scattering. And the proposed method will accelerate the pace of non-invasive detection of blood components into clinical application.
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Affiliation(s)
- Ai Liu
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin, 300072, China
- Tianjin Key Laboratory Biomedical Detecting Techniques and Instruments, Tianjin University, Tianjin, 300072, China
| | - Gang Li
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin, 300072, China
- Tianjin Key Laboratory Biomedical Detecting Techniques and Instruments, Tianjin University, Tianjin, 300072, China
| | - Zhigang Fu
- Med Examinat Ctr, 254 Hosp Peoples Liberat Army, Tianjin, 300142, China
| | - Yang Guan
- Med Examinat Ctr, 254 Hosp Peoples Liberat Army, Tianjin, 300142, China
| | - Ling Lin
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin, 300072, China.
- Tianjin Key Laboratory Biomedical Detecting Techniques and Instruments, Tianjin University, Tianjin, 300072, China.
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22
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Xu JX, Vithanage BCN, Athukorale SA, Zhang D. Scattering and absorption differ drastically in their inner filter effects on fluorescence, resonance synchronous, and polarized resonance synchronous spectroscopic measurements. Analyst 2018; 143:3382-3389. [DOI: 10.1039/c8an00790j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Reported herein is the finding that photon scattering and absorption differ drastically in inducing the sample IFE in SSF, RS2, and the PRS2 spectra measurements.
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Affiliation(s)
- Joanna Xiuzhu Xu
- Department of Chemistry
- Mississippi State University
- Mississippi State
- USA
| | | | | | - Dongmao Zhang
- Department of Chemistry
- Mississippi State University
- Mississippi State
- USA
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23
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Tolbin AY, Pushkarev VE, Tomilova LG, Zefirov NS. Threshold concentration in the nonlinear absorbance law. Phys Chem Chem Phys 2017; 19:12953-12958. [DOI: 10.1039/c7cp01514c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Deviation from the Beer–Lambert law at high concentrations was described in terms of the nonlinear absorbance on the basis of a new empirical equation, which includes the threshold concentration as a breakpoint on the continuous function ‘absorption coefficient vs. concentration’.
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Affiliation(s)
- Alexander Yu. Tolbin
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region
- Russian Federation
| | - Victor E. Pushkarev
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region
- Russian Federation
| | - Larisa G. Tomilova
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region
- Russian Federation
- Department of Chemistry M. V. Lomonosov Moscow State University
| | - Nikolay S. Zefirov
- Institute of Physiologically Active Compounds
- Russian Academy of Sciences
- Moscow Region
- Russian Federation
- Department of Chemistry M. V. Lomonosov Moscow State University
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24
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Tan TB, Chu WC, Yussof NS, Abas F, Mirhosseini H, Cheah YK, Nehdi IA, Tan CP. Physicochemical, morphological and cellular uptake properties of lutein nanodispersions prepared by using surfactants with different stabilizing mechanisms. Food Funct 2016; 7:2043-51. [PMID: 27010495 DOI: 10.1039/c5fo01621e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In this study, we prepared a series of lutein nanodispersions via the solvent displacement method, by using surfactants with different stabilizing mechanisms. The surfactants used include Tween 80 (steric stabilization), sodium dodecyl sulfate (SDS; electrostatic stabilization), sodium caseinate (electrosteric stabilization) and SDS-Tween 80 (electrostatic-steric stabilization). We then characterized the resulting lutein nanodispersions in terms of their particle size, particle size distribution, zeta potential, lutein content, flow behavior, apparent viscosity, transmittance, color, morphological properties and their effects on cell viability and cellular uptake. The type of surfactant used significantly (p < 0.05) affected the physical properties of the nanodispersions, but the chemical properties (lutein content) remained unaffected. Transmission electron microscopy (TEM) images obtained from this study demonstrated that the solvent displacement method was capable of producing lutein nanodispersions containing spherical particles with sizes ranging from 66.20-125.25 nm, depending on the type of surfactant used. SDS and SDS-Tween 80 surfactants negatively affected the viability of the HT-29 cells used in this study. Thus, for the cellular uptake determination, only Tween 80 and sodium caseinate surfactants were used. The cellular uptake of the lutein nanodispersion stabilized by sodium caseinate was higher than that which was stabilized by Tween 80. All things considered, the type of surfactant with different stabilizing mechanisms did produce lutein nanodispersions with different characteristics. These findings would aid in future selection of surfactants in order to produce nanodispersions with desirable properties.
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Affiliation(s)
- Tai Boon Tan
- Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
| | - Wern Cui Chu
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Nor Shariffa Yussof
- Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
| | - Faridah Abas
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Hamed Mirhosseini
- Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
| | - Yoke Kqueen Cheah
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Imededdine Arbi Nehdi
- King Saud University, College of Science, Chemistry Department, Riyadh, Saudi Arabia
| | - Chin Ping Tan
- Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
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Uusitalo E, Varrela J, Lassila L, Vallittu PK. Transmission of Curing Light through Moist, Air-Dried, and EDTA Treated Dentine and Enamel. BIOMED RESEARCH INTERNATIONAL 2016; 2016:5713962. [PMID: 27446954 PMCID: PMC4944042 DOI: 10.1155/2016/5713962] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/16/2016] [Accepted: 06/05/2016] [Indexed: 11/17/2022]
Abstract
Objective. This study measured light transmission through enamel and dentin and the effect of exposed dentinal tubules to light propagation. Methods. Light attenuation through enamel and dentin layers of various thicknesses (1 mm, 2 mm, 3 mm, and 4 mm) was measured using specimens that were (1) moist and (2) air-dried (n = 5). Measurements were repeated after the specimens were treated with EDTA. Specimens were transilluminated with a light curing unit (maximum power output 1869 mW/cm(2)), and the mean irradiance power of transmitting light was measured. The transmission of light through teeth was studied using 10 extracted intact human incisors and premolars. Results. Transmitted light irradiance through 1 mm thick moist discs was 500 mW/cm(2) for enamel and 398 mW/cm(2) for dentin (p < 0.05). The increase of the specimen thickness decreased light transmission in all groups (p < 0.005), and moist specimens attenuated light less than air-dried specimens in all thicknesses (p < 0.05). EDTA treatment increased light transmission from 398 mW/cm(2) to 439 mW/cm(2) (1 mm dentin specimen thickness) (p < 0.05). Light transmission through intact premolar was 6.2 mW/cm(2) (average thickness 8.2 mm) and through incisor was 37.6 mW/cm(2) (average thickness 5.6 mm). Conclusion. Light transmission through enamel is greater than that through dentin, probably reflecting differences in refractive indices and extinction coefficients. Light transmission through enamel, dentin, and extracted teeth seemed to follow Beer-Lambert's law.
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Affiliation(s)
- E. Uusitalo
- Institute of Dentistry, University of Turku, 20520 Turku, Finland
| | - J. Varrela
- Institute of Dentistry, University of Turku, 20520 Turku, Finland
- City of Turku Division of Welfare, 20520 Turku, Finland
- Department of Oral Development and Orthodontics, University of Turku, 20520 Turku, Finland
| | - L. Lassila
- Department of Biomaterials Science and Turku Clinical Biomaterials Centre (TCBC), 20520 Turku, Finland
| | - P. K. Vallittu
- Institute of Dentistry, University of Turku, 20520 Turku, Finland
- City of Turku Division of Welfare, 20520 Turku, Finland
- Department of Biomaterials Science and Turku Clinical Biomaterials Centre (TCBC), 20520 Turku, Finland
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