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Journal articles on the topic 'Attenuated total reflectance infrared spectroscopy (ATR-IR)'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Zarnowiec, Paulina, Andrzej Mizera, Magdalena Chrapek, Mariusz Urbaniak, and Wieslaw Kaca. "Chemometric analysis of attenuated total reflectance infrared spectra ofProteus mirabilisstrains with defined structures of LPS." Innate Immunity 22, no. 5 (2016): 325–35. http://dx.doi.org/10.1177/1753425916647470.

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Proteus spp. strains are some of the most important pathogens associated with complicated urinary tract infections and bacteremia affecting patients with immunodeficiency and long-term urinary catheterization. For epidemiological purposes, various molecular typing methods have been developed for this pathogen. However, these methods are labor intensive and time consuming. We evaluated a new method of differentiation between strains. A collection of Proteus spp. strains was analyzed by attenuated total reflectance Fourier transform infrared (ATR FT-IR) spectroscopy in the mid-infrared region. A

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2

McArdle, Patrick, Karen Gilligan, Desmond Cunningham, and Alan Ryder. "Determination of the Polymorphic Forms of Bicifadine Hydrochloride by Differential Scanning Calorimetry—Thermogravimetric Analysis, X-Ray Powder Diffraction, Attenuated Total Reflectance—Infrared Spectroscopy, and Attenuated Total Reflectance—Near-Infrared Spectroscopy." Applied Spectroscopy 59, no. 11 (2005): 1365–71. http://dx.doi.org/10.1366/000370205774783322.

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The pharmaceutical compound bicifadine hydrochloride, which has been found to crystallize in two polymorphic forms, has been characterized by thermal analysis, X-ray powder diffraction (XRPD), infrared (IR) spectroscopy, and near-infrared (NIR) spectroscopy. A series of 22 sample mixtures of polymorph 1 and polymorph 2 were prepared and calibration models for the quantitation of these binary mixtures have been developed for each of the XRPD, attenuated total reflectance (ATR)-IR, and ATR-NIR analytical techniques. The quantitative results were obtained using a partial least squares (PLS) algor

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3

Miloudi, Lynda, Franck Bonnier, Kevin Barreau, et al. "ATR-IR coupled to partial least squares regression (PLSR) for monitoring an encapsulated active molecule in complex semi-solid formulations." Analyst 143, no. 10 (2018): 2377–89. http://dx.doi.org/10.1039/c8an00547h.

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4

Assi, S., A. Guirguis, S. Halsey, S. Fergus, and J. L. Stair. "Analysis of ‘legal high’ substances and common adulterants using handheld spectroscopic techniques." Analytical Methods 7, no. 2 (2015): 736–46. http://dx.doi.org/10.1039/c4ay02169j.

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Three handheld spectrometers, near-infrared (NIR), Raman and attenuated total reflectance Fourier transform-infrared (ATR-FT-IR) spectroscopy, were used for the identification of ‘legal high’ model mixtures and Internet products.

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5

Pasieczna-Patkowska, Sylwia, and Jarosław Madej. "Comparison of photoacoustic, diffuse reflectance, attenuated total reflectance and transmission infrared spectroscopy for the study of biochars." Polish Journal of Chemical Technology 20, no. 4 (2018): 75–83. http://dx.doi.org/10.2478/pjct-2018-0057.

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Abstract Four infrared spectroscopic techniques - photoacoustic (PAS), diffuse reflectance (DRS), attenuated total reflectance (ATR) and transmission (TS) - were evaluated for the qualitative analysis of the biochar obtained from willow feedstock during pyrolysis. Increase in pyrolysis temperature resulted in more aromatic and carbonaceous structure of biochars. These changes could easily be detected from Fourier transform infrared (FT-IR) spectral differences. The comparison of the spectra obtained by the four FT-IR techniques allowed to conclude that there are differences in the spectra acqu

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6

Tague, Thomas. "Microanalysis Made Easy: Attenuated Total Reflectance (ATR)." Microscopy Today 7, no. 6 (1999): 16–17. http://dx.doi.org/10.1017/s1551929500064609.

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Reflection microscopy techniques are typically the easiest to employ for routine sample analysis, as they require little or no sample preparation. Included in these methods are reflection- absorption spectroscopy (RAS), which emulates transmission spectroscopy, diffuse reflection infrared spectroscopy (DRIFT), specular or external reflectance, and attenuated total reflectance (ATR). For RAS, DRIFT, and specular reflection, the nature of the resultant spectra is determined by the nature of the sample. These techniques will be discussed in future articles. ATR is primarily a surface technique wh

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7

Lechowicz, Łukasz, Wioletta Adamus-Białek, and Wiesław Kaca. "Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy and Artificial Neural Networks Applied to DifferentiateEscherichia colipapG+/papG-Strains." Journal of Spectroscopy 2013 (2013): 1–3. http://dx.doi.org/10.1155/2013/538686.

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Fimbriae are an important pathogenic factor ofEscherichia coliduring development of urinary tract infections. Here, we describe a new method for identification ofEscherichia colipapG+frompapG-strains using the attenuated total reflectance Fourier transform infrared Spectroscopy (ATR FT-IR). We applied artificial neural networks to the analysis of the ATR FT-IR results. These methods allowed to discriminateE. colipapG+frompapG-strains with accuracy of 99%.

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8

Forsskåhl, Ingegerd, Eija Kenttä, Pirjo Kyyrönen, and Olavi Sundström. "Depth Profiling of a Photochemically Yellowed Paper. Part II: FT-IR Techniques." Applied Spectroscopy 49, no. 2 (1995): 163–70. http://dx.doi.org/10.1366/0003702953963724.

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A strongly photo-yellowed paper, whose surface had been ground off to different depths, was subjected to various Fourier transform infrared (FT-IR) techniques, including attenuated total reflectance (ATR), diffuse reflectance (DRIFT), photoacoustic (PA), and potassium bromide pellet (KBr) spectroscopy. Depth profiling of the paper was accomplished by monitoring specific infrared bands which showed systematic and consistent changes caused by irradiation. The results from the different Fourier transform infrared techniques were compared.

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9

Álvarez, Ángela, and Jorge Yáñez. "Screening of Gunshot Residue in Skin Using Attenuated Total Reflection Fourier Transform Infrared (ATR FT-IR) Hyperspectral Microscopy." Applied Spectroscopy 74, no. 4 (2020): 400–407. http://dx.doi.org/10.1177/0003702819892930.

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The detection of gunshot residues (GSR) in skin is important in criminal forensic investigations related with firearms. Conventionally, the procedure is based on the detection of metallic or inorganic residues (IGSR). In this work, we propose attenuated total reflectance Fourier transform infrared (ATR FT-IR) hyperspectral microscopy as a complementary and nondestructive technique for detection of organic GSR (OGSR). The spectra were acquired from GSR of three ammunition manufacturers, which were collected from shooter’s hands by the tape-lifting method. Before spectroscopic analysis, a Na–Ca

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10

Snyder, Randy W., and Stephen J. Fuerniss. "ATR/IR Spectroscopic Method for following Photo-Polymer Curing." Applied Spectroscopy 46, no. 7 (1992): 1113–16. http://dx.doi.org/10.1366/0003702924124187.

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A method for examining the photo-induced polymerization of photoresists and solder masks, at the substrate/photopolymer interface, using attenuated total reflectance (ATR) and infrared spectroscopy is discussed. The method is especially useful for dry film photoresists and gives information concerning cure levels affected by exposure dose and photoresist thickness. The photoprocessing of Vacrel® 8100 series solder mask and Riston® 3100 series photoresists from Dupont are used as examples.

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11

Halim, Yuwana, Steven J. Schwartz, David Francis, Nathan A. Baldauf, and Luis E. Rodriguez-Saona. "Direct Determination of Lycopene Content in Tomatoes (Lycopersicon esculentum) by Attenuated Total Reflectance Infrared Spectroscopy and Multivariate Analysis." Journal of AOAC INTERNATIONAL 89, no. 5 (2006): 1257–62. http://dx.doi.org/10.1093/jaoac/89.5.1257.

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Abstract Lycopene is a potent antioxidant that has been shown to play critical roles in disease prevention. Efficient assays for detection and quantification of lycopene are desirable as alternatives to time- and labor-intensive methods. Attenuated total reflectance infrared (ATR-IR) spectroscopy was used for quantification of lycopene in tomato varieties. Calibration models were developed by partial least-squares regression (PLSR) using quantitative measures of lycopene concentration from liquid chromatography as reference method. IR spectra showed a distinct marker band at 957 cm1 for trans

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12

Dupuy, N., M. Meurens, B. Sombret, P. Legrand, and J. P. Huvenne. "Multivariate Determination of Sugar Powders by Attenuated Total Reflectance Infrared Spectroscopy." Applied Spectroscopy 47, no. 4 (1993): 452–57. http://dx.doi.org/10.1366/0003702934334949.

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Thanks to what has been achieved by Fourier transformation, infrared analysis can now become a state-of-the-art device in quality control laboratories if we consider its precision and the gain in time it ensures. Moreover, an increasing number of new mathematical regression methods such as partial least-squares (PLS) regression allow multicomponent quantitative analysis in mixtures. Nevertheless, the efficiency of infrared spectrometry as a quantitative analytical method often depends on the choice of an adequate presentation for the sample. For quantitative analysis of powders, sampling appea

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13

Śliwińska, Smolinski, and Kucharski. "Simultaneous Analysis of Heavy Metal Concentration in Soil Samples." Applied Sciences 9, no. 21 (2019): 4705. http://dx.doi.org/10.3390/app9214705.

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The application of Fourier transform infrared spectroscopy to the simultaneous analysis of heavy metal concentration in soil samples was demonstrated in this paper. Two spectral techniques, namely, attenuated total reflectance (ATR) and diffuse reflectance (DRIFT), were applied and the whole infrared spectral region, i.e., far IR, mid IR, and near IR were considered in this work. Spectral data with reference to the results of laboratory analysis enabled the development of calibration partial least squares (PLS) models. The PLS models for the ATR near IR were characterized by a good fit and goo

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14

Wang, Lai-Hao, and Wei-Chien Sung. "Rapid evaluation and quantitative analysis of eugenol derivatives in essential oils and cosmetic formulations on human skin using attenuated total reflectance–infrared spectroscopy." Spectroscopy 26, no. 1 (2011): 43–52. http://dx.doi.org/10.1155/2011/176163.

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We studied the fragrances 4-allylbenzenes (eugenol, methyl eugenol, acetyl eugenol) as well as 4-propenylbenzenes (isoeugenol) in commercial essential oils using a fast and nondestructive attenuated total reflectance–infrared (ATR–IR) spectroscopy method. The method was based on ATR–IR utilizing partial least square regression. The calibrations were modeled in the characteristic region for eugenol (1430–1432 cm−1), isoeugenol (960–970 cm−1) and methyl eugenol (803–807 cm−1). The models were then applied to predict the percutaneous absorption process yield and to monitor the concentrations of e

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15

Otsuka, Yuta, Akira Ito, Masaki Takeuchi, Suvra Pal, and Hideji Tanaka. "Predictive evaluation of powder X-ray diffractograms of pharmaceutical formulation powders based on infrared spectroscopy." Bio-Medical Materials and Engineering 31, no. 5 (2020): 307–17. http://dx.doi.org/10.3233/bme-206003.

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BACKGROUND: To ensure quality and stability, monitoring systems are recommended to analyze pharmaceutical manufacturing processes. OBJECTIVE: This study was performed to predict powder X-ray diffraction (PXRD) patterns of formulation powders through attenuated total reflectance (ATR)-infrared (IR) spectroscopy in a nondestructive manner along with chemometrics. RESULTS: Caffeine anhydrate, acetaminophen, and lactose monohydrate were grinded at six weight ratios. The six sample groups were evaluated using ATR-IR spectroscopy and PXRD analysis. Partial least squares models were constructed to pr

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16

Hobley, E. U., A. J. L. E. Gay Brereton, and B. Wilson. "Soil charcoal prediction using attenuated total reflectance mid-infrared spectroscopy." Soil Research 55, no. 1 (2017): 86. http://dx.doi.org/10.1071/sr16068.

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Despite strong evidence for the importance of charcoal as a long-term carbon sink in soils, simple methods to quantify charcoal in soil are still lacking. In this study, we tested the application of attenuated total reflectance mid-infrared spectroscopy (ATR-MIR) for quantification of charcoal in soil. To do this, we created calibration samples from defined quantities of pulverised rock, charcoal and litter sampled from a forest floor in Guy Fawkes National Park, New South Wales, Australia, and analysed them via ATR-MIR and dry combustion. The organic carbon concentration (mass proportion) of

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17

Xue, Gi, Shi-Ying Liu, Yi Jin, and Shan-Geng Jiang. "In Situ Studies of Coatings on Metal Wires by FT-IR External Reflectance Spectroscopy." Applied Spectroscopy 41, no. 7 (1987): 1172–75. http://dx.doi.org/10.1366/0003702874447455.

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Diffuse reflectance FT-IR spectroscopy was originally developed for particulate samples dispersed in KBr powders. Now, by using ellipsoid mirrors for scattered light collection, we have taken advantage of the collection efficiency of diffuse reflectance optics and have extended their use to an in situ study of coatings on metal wires and of the broken surface of a reinforcement wire as well. The result is that spectra of coatings on wire show good overall agreement with external reflection spectra of thin films. The technique we have developed has an advantage over infrared attenuated total re

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18

Shin, Eun-Mi, and Jack L. Koenig. "Molecular Orientation Study of the Drying of Latex in Real Time Using the Variable-Angle Attenuated Total Reflectance Technique." Applied Spectroscopy 56, no. 10 (2002): 1251–58. http://dx.doi.org/10.1366/000370202760355190.

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The changes in orientation of polymer chains during the drying of latex have been studied. The Fourier transform infrared spectroscopy-attenuated total reflectance (FT-IR ATR) technique was used to obtain dichroic ratios. The variable-angle ATR technique was used to profile the dichroic ratio changes at different depths in the films. Using the dichroic ratio and the Hermans orientation function, it was possible to monitor the orientation changes of the polymer chains during latex drying in real time. New insights into the film formation process during the different stages of drying and condens

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19

Morhart, Tyler A., Stuart Read, Garth Wells, et al. "Attenuated Total Reflection Fourier Transform Infrared (ATR FT-IR) Spectromicroscopy Using Synchrotron Radiation and Micromachined Silicon Wafers for Microfluidic Applications." Applied Spectroscopy 72, no. 12 (2018): 1781–89. http://dx.doi.org/10.1177/0003702818785640.

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A custom-designed optical configuration compatible with the use of micromachined multigroove internal reflection elements (μ-groove IREs) for attenuated total reflectance Fourier transform infrared (ATR FT-IR) spectroscopy and imaging applications in microfluidic devices is described. The μ-groove IREs consist of several face-angled grooves etched into a single, monolithic silicon chip. The optical configuration permits individual grooves to be addressed by focusing synchrotron sourced IR light through a 150 µm pinhole aperture, restricting the beam spot size to a dimension smaller than that o

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20

Curtis, Neville J., Jason R. Gascooke, and Allan Pring. "Silicon-Oxygen Region Infrared and Raman Analysis of Opals: The Effect of Sample Preparation and Measurement Type." Minerals 11, no. 2 (2021): 173. http://dx.doi.org/10.3390/min11020173.

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An extensive infrared (IR) spectroscopy study using transmission, specular and diffuse reflectance, and attenuated total reflection (ATR) was undertaken to characterise opal-AG, opal-AN (hyalite), opal-CT and opal-C, focussing on the Si-O fingerprint region (200–1600 cm−1). We show that IR spectroscopy is a viable alternative to X-ray powder diffraction (XRD) as a primary means of classification of opals even when minor levels of impurities are present. Variable angle specular reflectance spectroscopy shows that the three major IR bands of opal are split into transverse optical (TO) and longit

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21

Xu, Lisheng, and John R. Schlup. "Application of Near-Infrared Attenuated Total Reflectance Spectroscopy for Monitoring Epoxy Resin/Amine Cure Reactions." Applied Spectroscopy 50, no. 1 (1996): 109–14. http://dx.doi.org/10.1366/0003702963906654.

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Product quality in composite processing will be improved by dependable methods for monitoring the process. In this paper, the feasibility of using near-infrared attenuated total reflection (NIR ATR) spectroscopy as a sensor for monitoring epoxy resin cure is demonstrated. An ATR crystal serves as a contact sensor, which has several potential advantages over embedded optic fiber techniques previously reported. NIR ATR spectra obtained from several epoxy/amine systems show that both primary amine and epoxy functional groups have well-isolated absorption peaks in the near-infrared region. The uti

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22

Xu, J. R., and C. M. Balik. "Measurement of Diffusivities of Small Molecules in Polymers Using FT-IR-ATR." Applied Spectroscopy 42, no. 8 (1988): 1543–48. http://dx.doi.org/10.1366/0003702884429616.

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A numerical method is described for obtaining diffusion coefficients ( D) of infrared-absorbing species in polymers using attenuated total reflectance infrared spectroscopy. It involves measurement of changes in the integrated intensity of diffusant infrared bands as a function of time while the diffusant moves into or out of the polymer film. The technique is illustrated with latex paint films containing a calcium carbonate extender which diffuses out of the paint films upon exposure to sulfurous acid. The values of D obtained from two different CaCO3 infrared bands were in good agreement wit

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Taylor, Todd A., and Howard H. Patterson. "Spectroscopic Properties of WO3 Thin Films: Polarized FT-IR/ATR, X-Ray Diffraction, and Electronic Absorption." Applied Spectroscopy 48, no. 6 (1994): 674–77. http://dx.doi.org/10.1366/000370294774368992.

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The Fourier transform infrared/micro-attenuated total reflectance (FT-IR/mATR), X-ray diffraction (XRD), and electronic absorption properties of thin tungsten oxide films are characterized. Thin films of tungsten oxide (100–500 Å) deposited on SiO2 exhibit a different orientation or structure than thicker films. A p-polarized longitudinal optical (LO) mode at 970 cm−1 occurs in all ATR spectra of WO3 thin films and is one of the strongest IR bands in the spectra. The spectroscopic properties of tungsten oxide films are characterized as a function of substrate and heat treatment.

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Mysliwiec, Tami H., Anthony F. Tierno, and David J. Aurentz. "Characterization ofBacillus subtilissporulation and bacteriophage infection via FT-IR spectroscopy." Spectroscopy 23, no. 3-4 (2009): 165–74. http://dx.doi.org/10.1155/2009/456049.

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A comparative analysis on cultures from wild-type and sporulation mutants ofBacillus subtilisinfected with pseudotemperate spore-converting bacteriophages was performed to discern differences in the chemical functionality of the cellular population. Variations in the cell surface chemistry ofB. subtiliscultures were analyzed using attenuated total reflectance (ATR) Fourier transform infrared (FT-IR) spectroscopy of dried sample films on optical plates. Comparison of wild-type and phage infected cultures revealed an increase in the amount of aliphatic ester in the infected populations. Spectral

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25

Bellon-Maurel, Véronique, Céline Vallat, and Darrell Goffinet. "Quantitative Analysis of Individual Sugars during Starch Hydrolysis by FT-IR/ATR Spectrometry. Part I: Multivariate Calibration Study—Repeatibility and Reproducibility." Applied Spectroscopy 49, no. 5 (1995): 556–62. http://dx.doi.org/10.1366/0003702953964002.

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This paper discusses the use of Fourier transform infrared (FT-IR) spectroscopy coupled with an attenuated total reflectance (ATR) accessory as applied to the quantification of individual sugar concentrations (glucose, maltose, maltotriose, and maltodextrines) in real mixtures extracted during starch hydrolysis. Solutions studied contained dry matter ranging between 250 and 300 g/kg. Glucose and maltose were detected with the required precision, but not maltotriose or maltodextrines. The measurements are fairly repeatible, and predictions are reproducible.

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26

Kim, Sung-Kyoung, Hee-Young Choi, Ha-Jin Lee, and Haiwon Lee. "Characteristics of Electrodeposited Single-Walled Carbon Nanotube Films." Journal of Nanoscience and Nanotechnology 6, no. 11 (2006): 3614–18. http://dx.doi.org/10.1166/jnn.2006.17993.

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Thin films of chemically-functionalized single walled carbon nanotubes (SWNTs) were fabricated by using a direct current (DC) electrodeposition method. SWNTs were shortened and then functionalized with acid chloride group to combine with amine group-terminated gold substrate. The electrodeposited SWNT films were characterized by using Raman spectroscopy, attenuated total reflectance infrared (ATR/IR) spectrometry and atomic force microscopy. We demonstrated that the SWNT film was well distributed on an electrode with robust adhesion.

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Mirouze, F. De Lène, J. C. Boulou, N. Dupuy, M. Meurens, J. P. Huvenne, and P. Legrand. "Quantitative Analysis of Glucose Syrups by ATR/FT-IR Spectroscopy." Applied Spectroscopy 47, no. 8 (1993): 1187–91. http://dx.doi.org/10.1366/0003702934067946.

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Thanks to what has been achieved by the Fourier transform, infrared spectrometry can now become a state-of-the-art device in quality control laboratories if we consider its precision and the gain in time it ensures in comparison to results from traditional analytical methods such as chromatography. Moreover, the increasing number of new mathematical regression methods such as Partial Least-Squares (PLS) regression allows multicomponent quantitative analysis in mixtures. For instance, the analysis of the three main components (glucose, maltose, and fructose) of the dry substance which represent

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28

He, Hongyan, Hui Chen, Yanzhen Zheng, et al. "The Hydrogen-Bonding Interactions between 1-Ethyl-3-Methylimidazolium Lactate Ionic Liquid and Methanol." Australian Journal of Chemistry 66, no. 1 (2013): 50. http://dx.doi.org/10.1071/ch12308.

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1-Ethyl-3-Methylimidazolium lactate ([EMIM][LAC]) is an environmental friendly ionic liquid with potential industrial applications. Attenuated total reflectance infrared spectroscopy (ATR-IR) and density functional theory (DFT) calculations were employed to investigate the molecular interactions between methanol and [EMIM][LAC]. The infrared spectra were analyzed by two methods: excess spectroscopy and two-dimensional (2D) correlation spectroscopy. In the ATR-FTIR spectra, v(C4,5–H), v(C2–H), v(alkyl), v(–OD), and v(–COO) all show blue shifts upon addition of methanol. 2D correlation analysis

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Cozzolino, D., S. Roumeliotis, and J. Eglinton. "Feasibility study on the use of attenuated total reflectance MIR spectroscopy to measure the fructan content in barley." Anal. Methods 6, no. 19 (2014): 7710–15. http://dx.doi.org/10.1039/c4ay01560f.

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Masuda, Kaori, Taishiro Haramaki, Satoru Nakashima, Bertrand Habert, Isabelle Martinez, and Seiichi Kashiwabara. "Structural Change of Water with Solutes and Temperature up to 100 °C in Aqueous Solutions as Revealed by Attenuated Total Reflectance Infrared Spectroscopy." Applied Spectroscopy 57, no. 3 (2003): 274–81. http://dx.doi.org/10.1366/000370203321558173.

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The attenuated total reflectance infrared (ATR-IR) spectra of several aqueous solutions have been measured by using a newly developed heatable rod-type ATR cell. The OH stretching bands showed systematic change with increasing solute concentrations and these changes can be explained by four different OH components based on curve-fitting results. NaCl solutions show longer H-bond distance character, while carbonate solutions present shorter ones. The Na2CO3 1 M solution conserves this shorter H-bond nature up to 100 °C. On the other hand, the loose nature of NaCl solutions becomes less pronounc

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Bartick, Edward G., and John A. Reffner. "Forensic applications of IR infrared microscopic internal reflection spectroscopy." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (1992): 1528–29. http://dx.doi.org/10.1017/s0424820100132273.

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Since the introduction of commercial Fourier transform infrared (FTIR) microscopic systems in 1983, IR microscopy has developed as an important analytical tool in research, industry and forensic analysis. Because of the frequent encounter of small quantities of physical evidence found at crime scenes, spectroscopic IR microscopes have proven particularly valuable for forensic applications. Transmittance and reflectance measurements have proven very useful. Reflection-absorption, specular reflection, and diffuse reflection have all been applied. However, it has been only very recently that an i

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Wan, Chayan, Wenqing Cao, and Cungui Cheng. "Research of Recognition Method of Discrete Wavelet Feature Extraction and PNN Classification of Rats FT-IR Pancreatic Cancer Data." Journal of Analytical Methods in Chemistry 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/564801.

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Sprague-Dawley (SD) rats’ normal and abnormal pancreatic tissues are determined directly by attenuated total reflectance Fourier transform infrared (ATR-FT-IR) spectroscopy method. In order to diagnose earlier stage of SD rats pancreatic cancer rate with FT-IR, a novel method of extraction of FT-IR feature using discrete wavelet transformation (DWT) analysis and classification with the probability neural network (PNN) was developed. The differences between normal pancreatic and abnormal samples were identified by PNN based on the indices of 4 feature variants. When error goal was 0.01, the tot

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Ishida, Kenneth P., and Peter R. Griffiths. "Comparison of the Amide I/II Intensity Ratio of Solution and Solid-State Proteins Sampled by Transmission, Attenuated Total Reflectance, and Diffuse Reflectance Spectrometry." Applied Spectroscopy 47, no. 5 (1993): 584–89. http://dx.doi.org/10.1366/0003702934067306.

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The absolute and relative differences in amide I and amide II band intensities of albumin, β-lactoglobulin, and myoglobin as measured by attenuated total reflection infrared (ATR-IR) spectrometry, transmission of aqueous solutions, and KBr disks and diffuse reflectance (DR) spectrometry are compared. The amide I/II intensity ratios of the proteins sampled by ATR, DR, and transmission spectrometry of KBr disks were similar and were significantly different from the intensity ratios of the proteins in solution. The absolute amide II band intensity of dissolved proteins did not vary significantly

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Jelle, Bjørn Petter, and Per Jostein Hovde. "Fourier Transform Infrared Radiation Spectroscopy Applied for Wood Rot Decay and Mould Fungi Growth Detection." Advances in Materials Science and Engineering 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/969360.

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Material characterization may be carried out by the attenuated total reflectance (ATR) Fourier transform infrared (FTIR) radiation spectroscopical technique, which represents a powerful experimental tool. The ATR technique may be applied on both solid state materials, liquids, and gases with none or only minor sample preparations, also including materials which are nontransparent to IR radiation. This facilitation is made possible by pressing the sample directly onto various crystals, for example, diamond, with high refractive indices, in a special reflectance setup. Thus ATR saves time and en

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Everall, Neil J., and Arran Bibby. "Improvements in the Use of Attenuated Total Reflection Fourier Transform Infrared Dichroism for Measuring Surface Orientation in Polymers." Applied Spectroscopy 51, no. 8 (1997): 1083–91. http://dx.doi.org/10.1366/0003702971941647.

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Improvements in the use of attenuated total reflection (ATR) Fourier transform infrared (FT-IR) dichroism for measuring surface orientation in polymer films are described, with poly(ethylene terephthalate) (PET) as an example material. It is shown that normalizing band intensities relative to a nondichroic band, prior to calculating dichroic ratios, eliminates the need to maintain identical contact areas/pressures when removing, rotating, and reclamping samples to the ATR element, which has been a major historical drawback to this technique. The normalization is vital; it makes the calculated

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Carden, Angela, Michael G. Yost, and Richard A. Fenske. "Noninvasive Method for the Assessment of Dermal Uptake of Pesticides Using Attenuated Total Reflectance Infrared Spectroscopy." Applied Spectroscopy 59, no. 3 (2005): 293–99. http://dx.doi.org/10.1366/0003702053585372.

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Dermal absorption of pesticides is a primary exposure route for agricultural workers, but is not well characterized. Current measurement techniques are either invasive, such as tape-stripping, or require extensive sample preparation or analysis time, such as urinary metabolite monitoring or wipe sampling followed by gas chromatography analysis. We present the application of a noninvasive, spectroscopic approach for the measurement of pesticide absorption into skin. Attenuated total reflectance infrared spectroscopy (ATR-IR) was used to monitor directly the absorption of two pesticides—captan a

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Garside, Paul, Sophia Lahlil, and Paul Wyeth. "Characterization of Historic Silk by Polarized Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy for Informed Conservation." Applied Spectroscopy 59, no. 10 (2005): 1242–47. http://dx.doi.org/10.1366/000370205774430855.

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When assessing historic textiles and considering appropriate conservation, display, and storage strategies, characterizing the physical condition of the textiles is essential. Our work has concentrated on developing nondestructive or micro-destructive methodologies that will permit this. Previously, we have demonstrated a correlation between the physical deterioration of unweighted and “pink” tin (IV) chloride weighted silk and certain measurable spectroscopic and chromatographic signatures, derived from polarized Fourier transform infrared attenuated total reflectance (FTIR-ATR) spectroscopy

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Shandurkov, Dimitar, Petar Ignatov, Ivanka Spassova, and Stoyan Gutzov. "Spectral and Texture Properties of Hydrophobic Aerogel Powders Obtained from Room Temperature Drying." Molecules 26, no. 6 (2021): 1796. http://dx.doi.org/10.3390/molecules26061796.

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Attenuated Total Reflectance Infrared (ATR-IR) spectroscopy and texture measurements based on nitrogen adsorption-desorption isotherms are combined to characterize silica aerogel granules with different degrees of hydrophobicity. The aerogels were prepared from tetraethoxysilane via a room temperature hydrolysis-gelation process, solvent exchange, hydrophobization, and drying at subcritical conditions. The dependencies between the texture properties, pore architectures, surface fractal dimensions, and degree of hydrophobicity of the samples are extracted from the ATR-IR spectra and the adsorpt

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Kennedy, Eugene R., and Kevin Ashley. "Fourier Transform Infrared Spectrometry/Attenuated Total Reflectance Study of the Reaction of Pentanal and Propanal with 2-(Hydroxymethyl)Piperidine." Applied Spectroscopy 46, no. 2 (1992): 266–72. http://dx.doi.org/10.1366/0003702924125401.

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The reactions of propanal and pentanal with 2-(hydroxymethyl)piperidine were investigated by Fourier transform infrared spectrometry/attenuated total reflectance in both the solution phase and at the gas/solid interface. The reactions were studied with the use of a flow-through cylindrical internal reflection (“circle”) cell. Reaction intermediates were tentatively identified by their characteristic infrared absorption frequencies. At the gas/solid interface the reaction is thought to yield a hemiaminal intermediate. In the solution phase a hemiaminal intermediate is believed to form initially

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Fu, Fen-Ni, Michael P. Fuller, and Bal Ram Singh. "Use of Fourier Transform Infrared/Attenuated Total Reflectance Spectroscopy for the Study of Surface Adsorption of Proteins." Applied Spectroscopy 47, no. 1 (1993): 98–102. http://dx.doi.org/10.1366/0003702934048451.

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The adsorption behavior of lysozyme and immunoglobulin G (IgG) onto a ZnSe crystal surface has been detected by the FT-IR/ATR technique. With this technique we are able to detect the protein adsorption process at a very low concentration (0.0005 mg/mL). The equation of Sperline et al. [Langmuir 3, 198 (1987)] was successfully applied to calculate the adsorption density of protein from an aqueous solution on a real-time basis. The monolayer formation of lysozyme was observed at a concentration range of 10−7 M to 10−5 M. A monolayer-to-multilayer adsorption transition of lysozyme was clearly obs

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Bullen, Heather A., Stuart A. Oehrle, Ariel F. Bennett, Nicholas M. Taylor, and Hazel A. Barton. "Use of Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy To Identify Microbial Metabolic Products on Carbonate Mineral Surfaces." Applied and Environmental Microbiology 74, no. 14 (2008): 4553–59. http://dx.doi.org/10.1128/aem.02936-07.

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ABSTRACT This paper demonstrates the use of attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy to detect microbial metabolic products on carbonate mineral surfaces. By creating an ATR-FTIR spectral database for specific organic acids using ATR-FTIR spectroscopy we were able to distinguish metabolic acids on calcite surfaces following Escherichia coli growth. The production of these acids by E. coli was verified using high-performance liquid chromatography with refractive index detection. The development of this technique has allowed us to identify microbial metabol

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Sun, X. J., Y. L. Su, Roger D. Soloway, et al. "Rapid, intraoperative detection of malignancy using attenuated total reflectance (ATR) and mobile fourier transform infrared (FT-IR) spectroscopy." Gastroenterology 124, no. 4 (2003): A420—A421. http://dx.doi.org/10.1016/s0016-5085(03)82126-1.

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Cantor, Adam S. "Drug and excipient diffusion and solubility in acrylate adhesives measured by infrared-attenuated total reflectance (IR-ATR) spectroscopy." Journal of Controlled Release 61, no. 1-2 (1999): 219–31. http://dx.doi.org/10.1016/s0168-3659(99)00119-4.

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Gao, W. G., X. C. Liu та M. F. Chen. "In situ ATR-FTIR investigation and theoretical calculation of the interactions of chromate and citrate on the surface of haematite (α-Fe2O3)". RSC Advances 7, № 65 (2017): 41011–16. http://dx.doi.org/10.1039/c7ra04587e.

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In situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy was used to study the molecular kinetics of Cr(vi) reduction by citric acid at the α-Fe<sub>2</sub>O<sub>3</sub>–water interface.

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Kaur, Kiranpreet, Praveen Kumar Yadav, Gurvinder Singh Bumbrah, and Rakesh Mohan Sharma. "Forensic classification of lipsticks using attenuated total reflectance – Fourier transform infrared (ATR-FTIR) spectroscopy." Vibrational Spectroscopy 110 (September 2020): 103146. http://dx.doi.org/10.1016/j.vibspec.2020.103146.

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Martínez-Romo, A., R. González-Mota, J. J. Soto-Bernal, and I. Rosales-Candelas. "LDPE Oxidation by CO2 Laser Radiation (10.6 µm)." International Journal of Polymer Science 2018 (2018): 1–5. http://dx.doi.org/10.1155/2018/5150673.

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Thermooxidation of LDPE films by CO2 laser radiation, 10.6 μm, was characterized by Fourier transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR). The formation of carbonyl and hydroxyl functional groups onto LDPE films was dependent on the fluency of CO2 laser. IR absorption of vinyl groups and C-O bond present in alcohols showed a decrease and an increase, respectively, indicating that CO2 laser radiation causes simultaneous formation and accumulation of hydroperoxides in LDPE films; furthermore, crystallinity of LDPE films irradiated with CO2 tends to increase. So, CO

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Banks, Simon R., Chris Sammon, Colin D. Melia, and Peter Timmins. "Monitoring the Thermal Gelation of Cellulose Ethers in situ Using Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy." Applied Spectroscopy 59, no. 4 (2005): 452–59. http://dx.doi.org/10.1366/0003702053641496.

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In this work attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy was used to probe the thermal gelation behavior of aqueous solutions of hydroxypropyl methylcellulose (HPMC), specifically thermal gelation and accompanying precipitation. Cloud point measurements are usually evaluated through turbidity in dilute solutions but the method cannot readily be applied to more concentrated or highly viscous solutions. From the ATR-FTIR data, intensity changes of the v(CO) band marked the onset of gelation and information about the temperature of gelation and the effect of the

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Shick, Robert A., Jack L. Koenig, and Hatsuo Ishida. "Depth Profiling of Stratified Layers Using Variable-Angle ATR." Applied Spectroscopy 50, no. 8 (1996): 1082–88. http://dx.doi.org/10.1366/0003702963905411.

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It is shown that variable-angle attenuated total reflectance Fourier transform infrared spectroscopy is a viable technique to recover depth profile information on the molecular level. A number of known step profiles are measured to determine the limits of applicability for this method. Thickness results obtained by using the internal reflection technique are compared with thickness determination with the use of a profilometer.

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Nagarajan, R., A. Gupta, R. Mehrotra, and M. M. Bajaj. "Quantitative Analysis of Alcohol, Sugar, and Tartaric Acid in Alcoholic Beverages Using Attenuated Total Reflectance Spectroscopy." Journal of Automated Methods and Management in Chemistry 2006 (2006): 1–5. http://dx.doi.org/10.1155/jammc/2006/45102.

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Mid-infrared (MIR) spectroscopy in attenuated total reflectance (ATR) mode was used for quantifying ethanol, sucrose, and tartaric acid in alcoholic beverages. One hundred synthetic samples were prepared with different ethanol, sucrose, and tartaric acid concentrations. Experiments were carried out on Bio-Rad 175 C FTS using an ATR accessory. Spectra were recorded in the wavelength region 600–4000cm−1. Calibration was performed using partial least squares (PLS) algorithm. Commercially available alcoholic beverages (gin, rum, vodka, etc.) were experimented and concentration of ethanol in these

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Barraza-Garza, Guillermo, Hiram Castillo-Michel, Laura A. de la Rosa, et al. "Infrared Spectroscopy as a Tool to Study the Antioxidant Activity of Polyphenolic Compounds in Isolated Rat Enterocytes." Oxidative Medicine and Cellular Longevity 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/9245150.

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The protective effect of different polyphenols, catechin (Cat), quercetin (Qc) (flavonoids), gallic acid (GA), caffeic acid (CfA), chlorogenic acid (ChA) (phenolic acids), and capsaicin (Cap), against H2O2-induced oxidative stress was evaluated in rat enterocytes using Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) Spectroscopy and Fourier Transform Infrared Microspectroscopy (FTIRM), and results were compared to standard lipid peroxidation techniques: conjugated dienes (CD) and Thiobarbituric Acid Reactive Substances (TBARS). Analysis of ATR-FTIR and FTIRM spectral data al

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