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Brunner A, Unterberger SH, Auer H, Hautz T, Schneeberger S, Stalder R, Badzoka J, Kappacher C, Huck CW, Zelger B, Pallua JD. Suitability of Fourier transform infrared microscopy for the diagnosis of cystic echinococcosis in human tissue sections. JOURNAL OF BIOPHOTONICS 2024; 17:e202300513. [PMID: 38531615 DOI: 10.1002/jbio.202300513] [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: 12/05/2023] [Revised: 02/14/2024] [Accepted: 03/17/2024] [Indexed: 03/28/2024]
Abstract
Cystic echinococcosis (CE) is a global health concern caused by cestodes, posing diagnostic challenges due to nonspecific symptoms and inconclusive radiographic results. Diagnosis relies on histopathological evaluation of affected tissue, demanding comprehensive tools. In this retrospective case study, Fourier transform infrared microscopy was explored for detecting and identifying CE through biochemical changes in human tissue sections. Tissue samples from 11 confirmed CE patients were analyzed. Archived FFPE blocks were cut and stained, and then CE-positive unstained sections were examined using Fourier transform infrared microscopy post-deparaffinization. Results revealed the method's ability to distinguish echinococcus elements from human tissue, irrespective of organ type. This research showcases the potential of mid-infrared microscopy as a valuable diagnostic tool for CE, offering promise in enhancing diagnostic precision in the face of the disease's complexities.
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Affiliation(s)
- A Brunner
- Institute of Pathology, Neuropathology and Molecular Pathology, Medical University of Innsbruck, Innsbruck, Austria
| | - S H Unterberger
- Department of Material-Technology, Leopold-Franzens University Innsbruck, Innsbruck, Austria
| | - H Auer
- Department of Medical Parasitology, Clinical Institute of Hygiene and Medical Microbiology, Medical University of Vienna, Vienna, Austria
| | - T Hautz
- OrganLifeTM, Department of Visceral, Transplant and Thoracic Surgery, Medical University of Innsbruck, Innsbruck, Austria
| | - S Schneeberger
- OrganLifeTM, Department of Visceral, Transplant and Thoracic Surgery, Medical University of Innsbruck, Innsbruck, Austria
| | - R Stalder
- Institute of Mineralogy and Petrography, Leopold-Franzens University Innsbruck, Innsbruck, Austria
| | - J Badzoka
- Institute of Analytical Chemistry and Radiochemistry, University of Innsbruck, Innsbruck, Austria
| | - C Kappacher
- Institute of Analytical Chemistry and Radiochemistry, University of Innsbruck, Innsbruck, Austria
| | - C W Huck
- Institute of Analytical Chemistry and Radiochemistry, University of Innsbruck, Innsbruck, Austria
| | - B Zelger
- Institute of Pathology, Neuropathology and Molecular Pathology, Medical University of Innsbruck, Innsbruck, Austria
| | - J D Pallua
- Department of Hospital for Orthopedics and Traumatology, Medical University of Innsbruck, Innsbruck, Austria
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Esmonde-White K, Lewis M, Lewis IR. Direct Measurement of Chocolate Components Using Dispersive Raman Spectroscopy at 1000 nm Excitation. APPLIED SPECTROSCOPY 2023; 77:320-326. [PMID: 36547013 DOI: 10.1177/00037028221147941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Chocolate is a popular food around the world. Making chocolate-based confectionaries involve multiple processing steps including cocoa bean fermentation, cocoa bean roasting, grinding, and then a controlled crystallization, where the processing conditions yields the desirable polymorph V to give chocolate its characteristic snap and texture. Raman spectroscopy is well known as a technique that can provide a non-contact, non-destructive analysis of chemical composition and molecular structure. Yet, excitation in the visible and near-infrared (532-785 nm) has not been possible for dark or milk chocolate because of the samples' overwhelming fluorescence. New technologies enabling Raman spectroscopy closer to shortwave infrared wavelengths, closer to 1000 nm, are likely to reduce fluorescence of chocolate and other highly fluorescent samples. Based on the successes of 1064 nm excitation to understand chocolate blooming, we hypothesized that 1000 nm excitation would also reduce fluorescence and enable Raman spectroscopy in dark and milk chocolates. We used dispersive Raman spectroscopy at 1000 nm to measure white, milk, and dark chocolate and cocoa nibs. The use of 1000 nm excitation effectively reduced fluorescence, enabling qualitative and quantitative Raman spectroscopy directly on chocolate samples. These feasibility studies indicate that 1000 nm Raman spectroscopy can be used to measure chocolate in a laboratory or process environment.
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Affiliation(s)
| | - Mary Lewis
- Endress+Hauser Optical Analysis, Ann Arbor, MI, USA
| | - Ian R Lewis
- Endress+Hauser Optical Analysis, Ann Arbor, MI, USA
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3
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Gordillo-Galeano A, Ponce A, Mora-Huertas CE. In vitro release behavior of SLN, NLC, and NE: An explanation based on the particle structure and carried molecule location. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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4
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Probing fibrin's molecular response to shear and tensile deformation with coherent Raman microscopy. Acta Biomater 2021; 121:383-392. [PMID: 33321217 DOI: 10.1016/j.actbio.2020.12.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 11/16/2020] [Accepted: 12/09/2020] [Indexed: 11/22/2022]
Abstract
Blood clots are essential biomaterials that prevent blood loss and provide a temporary scaffold for tissue repair. In their function, these materials must be capable of resisting mechanical forces from hemodynamic shear and contractile tension without rupture. Fibrin networks, the primary load-bearing element in blood clots, have unique nonlinear mechanical properties resulting from fibrin's hierarchical structure. This structure provides multiscale load bearing from fiber deformation to protein unfolding. Here, we study the fiber and molecular scale response of fibrin under shear and tensile loads in situ using a combination of fluorescence and vibrational (molecular) microscopy. Imaging protein fiber orientation and molecular vibrations, we find that fiber alignment and molecular unfolding in fibrin appear at much larger strains under shear compared to uniaxial tension. Alignment levels reached at 150% shear strain were reached already at 60% tensile strain, and molecular unfolding of fibrin was only detected at shear strains above 300%, whereas fibrin unfolding began already at 20% tensile strain. Moreover, shear deformation caused progressive changes in vibrational modes consistent with increased protofibril and fiber packing that were already present even at very low tensile deformation. Together with a bioinformatic analysis of the primary fibrinogen structure, we propose a scheme for the molecular response of fibrin from low to high deformation, which may relate to the teleological origin of fibrin's resistance to shear and tensile forces.
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Igonina TN, Okotrub KA, Brusentsev EY, Chuyko EA, Ragaeva DS, Ranneva SV, Amstislavsky SY. Alteration of the lipid phase transition during mouse embryos freezing after in vitro culture with linoleic acid. Cryobiology 2021; 99:55-63. [PMID: 33485897 DOI: 10.1016/j.cryobiol.2021.01.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Revised: 01/06/2021] [Accepted: 01/18/2021] [Indexed: 01/03/2023]
Abstract
Lipids significantly affect embryo cryopreservation in some mammalian species depending on the cell lipidome quantity and composition. One of the ways to study the relationship between lipid content and cryotolerance of cells is to study the effect of lipidome modification on laboratory mice. The objective of this research was to study how in vitro culture of mouse embryos with linoleic acid (LA) will affect lipid phase transition (LPT) during cooling and subsequent embryo development after cryopreservation. Embryos obtained in vivo at the 2-cell stage were cultured with 200 μM LA for 46 h up to the morula/blastocyst stage. Thereafter, one portion of embryos was slowly frozen to reveal the effect of LA on survival after cryopreservation, another portion was used to characterize the lipid composition and to determine the temperature of the LPT onset. Confocal fluorescence microscopy of Nile Red stained embryos showed a significant increase in lipid content of the LA treated group compared to the controls. Raman measurements showed that the onset of LPT in LA treated embryos is lower than in untreated ones: -5 °C vs +2 °C. However, these changes in the LPT onset did not affect the survival rates of embryos after cryopreservation. In summary, in vitro culture with LA changes the biophysical characteristics of embryos' lipidome and is realized in lower LPT onset, but this does not affect embryo survival after cryopreservation.
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Affiliation(s)
- T N Igonina
- Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Prosp. Lavrent'eva 10, Novosibirsk, 630090, Russia
| | - K A Okotrub
- Institute of Automation and Electrometry, Siberian Branch of the Russian Academy of Sciences, Prosp. Koptyuga 1, Novosibirsk, 630090, Russia
| | - E Yu Brusentsev
- Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Prosp. Lavrent'eva 10, Novosibirsk, 630090, Russia
| | - E A Chuyko
- Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Prosp. Lavrent'eva 10, Novosibirsk, 630090, Russia
| | - D S Ragaeva
- Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Prosp. Lavrent'eva 10, Novosibirsk, 630090, Russia
| | - S V Ranneva
- Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Prosp. Lavrent'eva 10, Novosibirsk, 630090, Russia; Novosibirsk State University, Pirogova 2, Novosibirsk, 630090, Russia
| | - S Ya Amstislavsky
- Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Prosp. Lavrent'eva 10, Novosibirsk, 630090, Russia.
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Amstislavsky S, Mokrousova V, Brusentsev E, Okotrub K, Comizzoli P. Influence of Cellular Lipids on Cryopreservation of Mammalian Oocytes and Preimplantation Embryos: A Review. Biopreserv Biobank 2019; 17:76-83. [PMID: 30256133 DOI: 10.1089/bio.2018.0039] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
- Sergei Amstislavsky
- Department of Cryopreservation and Reproductive Technologies, Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Valentina Mokrousova
- Department of Cryopreservation and Reproductive Technologies, Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
| | - Eugeny Brusentsev
- Department of Cryopreservation and Reproductive Technologies, Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Konstantin Okotrub
- Laboratory of Condensed Matter, Institute of Automation and Electrometry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Pierre Comizzoli
- Center of Species Survival, Smithsonian Conservation Biology Institute, Smithsonian National Zoological Park, Washington, District of Columbia
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7
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Sadeghpour A, Parada ML, Vieira J, Povey M, Rappolt M. Global Small-Angle X-ray Scattering Data Analysis of Triacylglycerols in the Molten State (Part I). J Phys Chem B 2018; 122:10320-10329. [PMID: 30351127 DOI: 10.1021/acs.jpcb.8b06704] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The study of triacylglycerols (TAGs) in their molten state is of fundamental importance for a deeper understanding of the TAG crystallization processes, being highly relevant for both manufacturing and medical applications. Although different models have been proposed to explain the nanostructured nature of the fluid state of TAGs, none of them are fully satisfactory. In this paper, we propose a new model consisting of positionally uncorrelated lamellar TAG assemblies embedded in an isotropic medium that assist as prenucleating structures. This model was validated by applying a novel global fitting method, resulting in an excellent agreement with the small-angle X-ray scattering data. A deeper analysis of the scattering patterns at different temperatures, both in cooling and heating directions, allowed us further to detect the crystalline traces of TAGs even after heating to 40 °C and record, on cooling, the onset of crystallization at 30-25 °C. The application of the presented novel model not only explains the outstandingly structured fluid of molten TAGs, but also lays the basis for analyzing first the crystallization steps in greater detail, which is outlined in our follow-up paper "Global Small-Angle X-ray Scattering Data Analysis of Triacylglycerols in the α-Phase (Part II)".
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Affiliation(s)
- Amin Sadeghpour
- School of Food Science and Nutrition , University of Leeds , Leeds LS2 9JT , U.K.,Department of Materials Meet Life, Empa , Swiss Federal Laboratories for Materials Science and Technology , 8600 St. Gallen , Switzerland
| | - Marjorie Ladd Parada
- School of Food Science and Nutrition , University of Leeds , Leeds LS2 9JT , U.K
| | | | - Megan Povey
- School of Food Science and Nutrition , University of Leeds , Leeds LS2 9JT , U.K
| | - Michael Rappolt
- School of Food Science and Nutrition , University of Leeds , Leeds LS2 9JT , U.K
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8
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Okotrub KA, Mokrousova VI, Amstislavsky SY, Surovtsev NV. Lipid Droplet Phase Transition in Freezing Cat Embryos and Oocytes Probed by Raman Spectroscopy. Biophys J 2018; 115:577-587. [PMID: 30099990 DOI: 10.1016/j.bpj.2018.06.019] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 06/08/2018] [Accepted: 06/14/2018] [Indexed: 12/15/2022] Open
Abstract
Embryo and oocyte cryopreservation is a widely used technology for cryopreservation of genetic resources. One limitation of cryopreservation is the low tolerance to freezing observed for oocytes and embryos rich in lipid droplets. We apply Raman spectroscopy to investigate freezing of lipid droplets inside cumulus-oocyte complexes, mature oocytes, and early embryos of a domestic cat. Raman spectroscopy allows one to characterize the degree of lipid unsaturation, the lipid phase transition from the liquid-like disordered to solid-like ordered state, and the triglyceride polymorphic state. For all cells examined, the average degree of lipid unsaturation is estimated as ∼1.3 (with ±20% deviation) double bonds per acyl chain. The onset of the lipid phase transition occurs in a temperature range from -10 to +4°C and does not depend on the cell type. Lipid droplets in cumulus-oocyte complexes are found to undergo abrupt lipid crystallization shifted in temperature from the ordering of the lipid conformational state. In the case of mature oocytes and early embryos obtained in vitro, the lipid crystallization is broadened. In the frozen state, lipid droplets inside cumulus-oocyte complexes have a higher content of triglyceride polymorphic β and β' phases than estimated for mature oocytes and early embryos. For the first time, to our knowledge, the temperature evolution of the phase state of lipid droplets is examined. Raman spectroscopy is proved to be a promising tool for in situ monitoring of the lipid phase state in a single embryo/oocyte during its freezing.
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Affiliation(s)
- Konstantin A Okotrub
- Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk, Russia.
| | - Valentina I Mokrousova
- Institute of Cytology and Genetics, Russian Academy of Sciences, Novosibirsk, Russia; Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
| | | | - Nikolay V Surovtsev
- Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk, Russia; Department of Physics, Novosibirsk State University, Novosibirsk, Russia
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9
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Wiercigroch E, Szafraniec E, Czamara K, Pacia MZ, Majzner K, Kochan K, Kaczor A, Baranska M, Malek K. Raman and infrared spectroscopy of carbohydrates: A review. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017. [PMID: 28599236 DOI: 10.1002/jrs.4607] [Citation(s) in RCA: 567] [Impact Index Per Article: 81.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Carbohydrates are widespread and naturally occurring compounds, and essential constituents for living organisms. They are quite often reported when biological systems are studied and their role is discussed. However surprisingly, up till now there is no database collecting vibrational spectra of carbohydrates and their assignment, as has been done already for other biomolecules. So, this paper serves as a comprehensive review, where for selected 14 carbohydrates in the solid state both FT-Raman and ATR FT-IR spectra were collected and assigned. Carbohydrates can be divided into four chemical groups and in the same way is organized this review. First, the smallest molecules are discussed, i.e. monosaccharides (d-(-)-ribose, 2-deoxy-d-ribose, l-(-)-arabinose, d-(+)-xylose, d-(+)-glucose, d-(+)-galactose and d-(-)-fructose) and disaccharides (d-(+)-sucrose, d-(+)-maltose and d-(+)-lactose), and then more complex ones, i.e. trisaccharides (d-(+)-raffinose) and polysaccharides (amylopectin, amylose, glycogen). Both Raman and IR spectra were collected in the whole spectral range and discussed looking at the specific regions, i.e. region V (3600-3050cm-1), IV (3050-2800cm-1) and II (1200-800cm-1) assigned to the stretching vibrations of the OH, CH/CH2 and C-O/C-C groups, respectively, and region III (1500-1200cm-1) and I (800-100cm-1) dominated by deformational modes of the CH/CH2 and CCO groups, respectively. In spite of the fact that vibrational spectra of saccharides are significantly less specific than spectra of other biomolecules (e.g. lipids or proteins), marker bands of the studied molecules can be identified and correlated with their structure.
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Affiliation(s)
- Ewelina Wiercigroch
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Ewelina Szafraniec
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Krzysztof Czamara
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Marta Z Pacia
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Katarzyna Majzner
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Kamila Kochan
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Agnieszka Kaczor
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Malgorzata Baranska
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland.
| | - Kamilla Malek
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland.
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Yui H, Isozaki Y, Morisaku T. α-Melt Structure of 1,3-Dipalmitoyl-2-oleoyl-sn-glycerol (POP) under a Thermal Thawing Process Studied by Infrared Spectroscopy. ANAL SCI 2017; 33:75-78. [PMID: 28070080 DOI: 10.2116/analsci.33.75] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The temperature thawing, as called tempering, of triacylglycerols (TAGs) is an important processing method in food productions, such as chocolates, cream, confections, and spreads. Especially, melt-mediation by temperature thawing is famous in chocolate production for controlling the polymorphic crystalline forms and accelerating crystallization. In the present study, we investigated the α-melt structure of 1,3-dipalmitoyl-2-oleoyl-sn-glycerol (POP), one of the major continuants of cacao butter, under a phase transition from its melt to γ-crystal with in-situ attenuated total reflection-infrared (ATR-IR) spectroscopy. The differential IR spectrum between α-melt via temperature thawing (α-melt mediation) and melt via simple cooling revealed that crystal-like local ordered structures remained in part in the α-melt, and that they acted as nuclei for a rapid phase transition to the γ-crystal. The changes to the γ-crystal occur in the local ordered structures at first from the glycerol moiety to the acyl chains in the crystallization, providing an important suggestion concerning the mechanism for the acceleration of crystallization to the γ-form via α-melt mediation.
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Affiliation(s)
- Hiroharu Yui
- Department of Chemistry, Faculty of Science, Tokyo University of Science
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11
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Motoyama M, Ando M, Sasaki K, Nakajima I, Chikuni K, Aikawa K, Hamaguchi HO. Simultaneous imaging of fat crystallinity and crystal polymorphic types by Raman microspectroscopy. Food Chem 2015; 196:411-7. [PMID: 26593509 DOI: 10.1016/j.foodchem.2015.09.043] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 09/09/2015] [Accepted: 09/12/2015] [Indexed: 10/23/2022]
Abstract
The crystalline states of fats, i.e., the crystallinity and crystal polymorphic types, strongly influence their physical properties in fat-based foods. Imaging of fat crystalline states has thus been a subject of abiding interest, but conventional techniques cannot image crystallinity and polymorphic types all at once. This article demonstrates a new technique using Raman microspectroscopy for simultaneously imaging the crystallinity and polymorphic types of fats. The crystallinity and β' crystal polymorph, which contribute to the hardness of fat-based food products, were quantitatively visualized in a model fat (porcine adipose tissue) by analyzing several key Raman bands. The emergence of the β crystal polymorph, which generally results in food product deterioration, was successfully imaged by analyzing the whole fingerprint regions of Raman spectra using multivariate curve resolution alternating least squares analysis. The results demonstrate that the crystalline states of fats can be nondestructively visualized and analyzed at the molecular level, in situ, without laborious sample pretreatments.
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Affiliation(s)
- Michiyo Motoyama
- NARO Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO), Ikenodai 2, Tsukuba, Ibaraki 305-0901, Japan.
| | - Masahiro Ando
- Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, Wakamatsuchou 2-2, Shinjuku, Tokyo 162-8480, Japan
| | - Keisuke Sasaki
- NARO Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO), Ikenodai 2, Tsukuba, Ibaraki 305-0901, Japan
| | - Ikuyo Nakajima
- NARO Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO), Ikenodai 2, Tsukuba, Ibaraki 305-0901, Japan
| | - Koichi Chikuni
- NARO Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO), Ikenodai 2, Tsukuba, Ibaraki 305-0901, Japan
| | - Katsuhiro Aikawa
- NARO Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization (NARO), Ikenodai 2, Tsukuba, Ibaraki 305-0901, Japan
| | - Hiro-O Hamaguchi
- Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, Wakamatsuchou 2-2, Shinjuku, Tokyo 162-8480, Japan; Department of Applied Chemistry, College of Science, National Chiao Tung University, Taiwan, 1001 University Road, Hsinchu 300, Taiwan, Republic of China
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12
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Han S, Luan YM, Pang SF, Zhang YH. Thermodynamic and spectroscopic analysis of the conformational transition of poly(vinyl alcohol) by temperature-dependent FTIR. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 139:37-42. [PMID: 25554949 DOI: 10.1016/j.saa.2014.11.100] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 11/18/2014] [Accepted: 11/25/2014] [Indexed: 06/04/2023]
Abstract
The conformational change of poly(vinyl alcohol) has been studied by Fourier transform infrared spectroscopy at various temperatures in the 4000-400 cm(-1) region. The molecular motion and the trans/gauche content are sensitive to the C-H, C-C stretching modes. FTIR spectra show that the I2920/I2849 decreases from 1.84 to 1.0 with increasing temperature, companying the decrease in I1047/I1095 from 0.78 to 0.58, implying the conformational transition from trans to gauche in alkyl chain. Based on the van't Hoff relation, the enthalpies and entropies have been calculated in different temperatures, which are 4.61 kJ mol(-1) and 15.23 J mol(-1) K(-1), respectively, in the region of 80-140°C. From the C=O stretching mode and O-H band, it can be concluded that the intermolecular hydrogen bonds decrease owing to elevating temperature, which leads to more gauche conformers.
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Affiliation(s)
- Shan Han
- Institute of Chemical Physics, School of Chemistry, Beijing Institute of Technology, Beijing 100081, China
| | - Ye-Mei Luan
- College of Textile, Hebei University of Science and Technology, Shijiazhuang 050018, China
| | - Shu-Feng Pang
- Institute of Chemical Physics, School of Chemistry, Beijing Institute of Technology, Beijing 100081, China.
| | - Yun-Hong Zhang
- Institute of Chemical Physics, School of Chemistry, Beijing Institute of Technology, Beijing 100081, China.
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13
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Motoyama M, Chikuni K, Narita T, Aikawa K, Sasaki K. In situ Raman spectrometric analysis of crystallinity and crystal polymorphism of fat in porcine adipose tissue. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:69-75. [PMID: 23230815 DOI: 10.1021/jf3034896] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
From the adipose tissues of pork carcasses stored in a refrigerator, Raman spectra were observed in situ by a portable Raman spectrometer. The observed Raman spectra, which were almost completely due to fat, showed clear dependence on the refrigeration time and carcass temperature. This dependence reflected an increase in the crystallinity of the fat and a change in the fraction of the β' polymorph. Evidence of changes in the packing order of the aliphatic chains of acylglycerol molecules was obtained, and the changes lasted for a long time after the temperature reached the lowest point (4.3 °C). Possibilities of using Raman spectrometry as a tool for routine monitoring of the conditions of carcasses as well as for research on the improvement of the mechanical strength of the adipose tissue are discussed.
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Affiliation(s)
- Michiyo Motoyama
- Institute of Livestock and Grassland Science, National Agricultural Research Organization (NARO), Ibaraki, Japan.
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14
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Dynamic molecular movements and aggregation structures of lipids in a liquid state. Curr Opin Colloid Interface Sci 2011. [DOI: 10.1016/j.cocis.2011.06.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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Li BL, Clarke SM, Wilson DI. Solid monolayers of glycerides adsorbed on the surface of graphite powder. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.08.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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16
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Bresson S, Rousseau D, Ghosh S, Marssi ME, Faivre V. Raman spectroscopy of the polymorphic forms and liquid state of cocoa butter. EUR J LIPID SCI TECH 2011. [DOI: 10.1002/ejlt.201100088] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Adam-Berret M, Boulard M, Riaublanc A, Mariette F. Evolution of fat crystal network microstructure followed by NMR. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:1767-73. [PMID: 21314096 DOI: 10.1021/jf102734d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Model systems composed of tristearin in solid state and tricaprin in liquid state with different solid-fat content (SFC) and storage time have been investigated by relaxation NMR and NMR diffusometry. The T(2) relaxation of the tricaprin in the melt exhibited a bimodal distribution as previously observed. The SFC had a major effect on the T(2) relaxation. This effect was explained according to the fast diffusive exchange model in porous media. According to this model the changes in T(2) relaxation as a function of the SFC and storage time were explained by the decrease of the surface-to-volume ratio of the crystal induced by Ostwald ripening. The diffusion coefficient D of the tricaprin in the melt decreased for higher SFC. Since no significant variation of D was observed for different diffusion time, D reflected the long-range connectivity and the tortuosity was calculated. During storage the diffusion coefficient remained constant.
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Tang H, Sun S, Wu J, Wu P, Wan X. Conformational changes in novel thermotropic liquid crystalline polymer without conventional mesogens: A Raman spectroscopic investigation. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.09.036] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Da Silva E, Bresson S, Rousseau D. Characterization of the three major polymorphic forms and liquid state of tristearin by Raman spectroscopy. Chem Phys Lipids 2009; 157:113-9. [DOI: 10.1016/j.chemphyslip.2008.11.002] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2008] [Revised: 10/02/2008] [Accepted: 11/04/2008] [Indexed: 10/21/2022]
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