In-Situ, Non-Destructive Control Of Food Quality Using Near-Infrared Raman Spectroscopy And Multivariate Analysis

2010 ◽  
Author(s):  
L. S. Christensen ◽  
K. D. Jernsho̸j ◽  
M. Hedegaard ◽  
S. Hassing ◽  
P. M. Champion ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Multivariate Analysis ◽  
Food Quality ◽  
Near Infrared ◽  
Non Destructive

Precise Determination of Percent Cure of Epoxide Polymers and Composites via Fiber-Optic Raman Spectroscopy and Multivariate Analysis

1997 ◽  
Vol 51 (2) ◽  
pp. 247-252 ◽  
Author(s):  
Jeffrey F. Aust ◽  
Karl S. Booksh ◽  
Christopher M. Stellman ◽  
Richard S. Parnas ◽  
Michael L. Myrick
Keyword(s):  
Raman Spectroscopy ◽  
Multivariate Analysis ◽  
Real Time ◽  
Fiber Optic ◽  
Precise Determination ◽  
Probe Design ◽  
Epoxide Polymers ◽  
Time Determination

A method for real-time determination of the percent cure of epoxies via in situ fiber-optic Raman spectroscopy has been developed. This method utilizes a probe design developed for real-time monitoring of polymer curing and multivariate analysis to interpret the data and determine percent cure. This method was demonstrated to be reliable to ±0.54% of cure in laboratory samples over a 50–99% cure range. A preliminary study measuring cure percentage in an industrial, glass-reinforced composite has been shown to be reliable to ±0.82% in the 40–90% cure range.

scholarly journals An in situ Raman spectroscopy-based microfluidic “lab-on-a-chip” platform for non-destructive and continuous characterization of Pseudomonas aeruginosa biofilms

2015 ◽  
Vol 51 (43) ◽  
pp. 8966-8969 ◽  
Author(s):  
Jinsong Feng ◽  
César de la Fuente-Núñez ◽  
Michael J. Trimble ◽  
Jie Xu ◽  
Robert E. W. Hancock ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Raman Spectroscopy ◽  
Lab On A Chip ◽  
Confocal Raman Microscopy ◽  
In Situ Raman Spectroscopy ◽  
In Situ Raman ◽  
Confocal Raman ◽  
Non Destructive

Pseudomonas aeruginosabiofilm was cultivated and characterized in a microfluidic “lab-on-a-chip” platform coupled with confocal Raman microscopy in a non-destructive manner.

Quantitative Analysis of Raman Spectra from Diamond Like Carbon: Calibration Transfer

1998 ◽  
Vol 555 ◽  
Author(s):  
S. S. Rosenblum ◽  
Kevin L. Davis ◽  
James M. Tedesco
Keyword(s):  
Raman Spectroscopy ◽  
Hard Disk Drives ◽  
Diamond Like Carbon ◽  
Disk Drives ◽  
Calibration Transfer ◽  
Carbon Coatings ◽  
Protective Layers ◽  
Non Destructive

AbstractWe report on Raman studies of diamond-like carbon (DLC) films; in particular, we report on the instrumentation and methodology required for comparing Raman measurements taken on different Raman analyzers. Raman spectroscopy has taken on an increasingly important role in materials processing because of its capability of performing non-destructive, in situ characterization of thin films. In particular, noncrystalline carbon coatings have become ubiquitous as protective layers on everything from machine tools to hard disk drives. As tolerances on coating properties begin to play an important part in determining device failure, Raman spectroscopy has found ever greater application as a quality control/quality assurance tool. However, use of Raman as an analytical tool has been hampered by the inability to quantitatively compare spectra obtained with different Raman analyzers. By using automated, robust calibration protocols on both the wavelength and intensity axes, we have demonstrated cross-instrument calibration transfer of DLC films.

scholarly journals Preliminary Assessment of Parmigiano Reggiano Authenticity by Handheld Raman Spectroscopy

Foods ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1563
Author(s):  
Mario Li Vigni ◽  
Caterina Durante ◽  
Sara Michelini ◽  
Marco Nocetti ◽  
Marina Cocchi
Keyword(s):  
Raman Spectroscopy ◽  
Near Infrared ◽  
Multivariate Calibration ◽  
Calibration Model ◽  
Preliminary Assessment ◽  
Model Based ◽  
Intact Sample ◽  
Non Destructive ◽  
Maximum Content ◽  
Parmigiano Reggiano

Raman spectroscopy, and handheld spectrometers in particular, are gaining increasing attention in food quality control as a fast, portable, non-destructive technique. Furthermore, this technology also allows for measuring the intact sample through the packaging and, with respect to near infrared spectroscopy, it is not affected by the water content of the samples. In this work, we evaluate the potential of the methodology to model, by multivariate data analysis, the authenticity of Parmigiano Reggiano cheese, which is one of the most well-known and appreciated hard cheeses worldwide, with protected denomination of origin (PDO). On the other hand, it is also highly subject to counterfeiting. In particular, it is critical to assess the authenticity of grated cheese, to which, under strictly specified conditions, the PDO is extended. To this aim, it would be highly valuable to develop an authenticity model based on a fast, non-destructive technique. In this work, we present preliminary results obtained by a handheld Raman spectrometer and class-modeling (Soft Independent Modeling of Class Analogy, SIMCA), which are extremely promising, showing sensitivity and specificity of 100% for the test set. Moreover, another salient issue, namely the percentage of rind in grated cheese, was addressed by developing a multivariate calibration model based on Raman spectra. It was possible to obtain a prediction error around 5%, with 18% being the maximum content allowed by the production protocol.

scholarly journals Application of FTIR and Raman Spectroscopy to Characterisation of Bioactive Materials and Living Cells

2003 ◽  
Vol 17 (2-3) ◽  
pp. 275-288 ◽  
Author(s):  
I. Notingher ◽  
J. R. Jones ◽  
S. Verrier ◽  
I. Bisson ◽  
P. Embanga ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Near Infrared ◽  
Cell Damage ◽  
Living Cells ◽  
Biologically Active ◽  
Bioactive Materials ◽  
45S5 Bioglass ◽  
Ftir And Raman Spectroscopy

Both Fourier Transform Infrared (FTIR) and Raman spectroscopy have been applied to thein vitrocharacterisation of biomaterials, mainly surface reactions leading to the formation of a biologically active hydroxycarbonate apatite (HCA) layer on the sample surface when immersed in simulated body fluids (SBF). The HCA layer indicates the degree of bioactivity of the sample, because it leads to a strong bond between the biomaterial and living tissue. Reflection measurements using FTIR allow quick, non-destructive detection of the HCA layer for solid and powder samples. Due to the low Raman scattering efficiency and low absorption of water in the visible-near infrared region, Raman micro-spectroscopy was successfully used for thein situcharacterisation of 20 and 40µm diameter 45S5 Bioglass®fibres. Thein situcapabilities of the Raman micro-spectrometer have also been extended to the characterisation of living cells attached on bioinert silica and bioactive 45S5 Bioglass®and 58S substrates. Using a high power 785 nm laser, living cells in physiological conditions can be real-time sampled over long periods of time without inducing cell damage and with good signal strength. Cell death can be monitored because it proved to induce strong changes in the Raman signature in the spectral regions 1000–1150 cm–1and 1550–1650 cm–1.

scholarly journals In situ Raman mapping of art objects

2016 ◽  
Vol 374 (2082) ◽  
pp. 20160039 ◽  
Author(s):  
D. Lauwers ◽  
Ph. Brondeel ◽  
L. Moens ◽  
P. Vandenabeele
Keyword(s):  
Raman Spectroscopy ◽  
Spatial Distribution ◽  
Chemical Information ◽  
Raman Mapping ◽  
In Situ Raman ◽  
Art Objects ◽  
Mapping System ◽  
Non Destructive ◽  
Raman Image

Raman spectroscopy has grown to be one of the techniques of interest for the investigation of art objects. The approach has several advantageous properties, and the non-destructive character of the technique allowed it to be used for in situ investigations. However, compared with laboratory approaches, it would be useful to take advantage of the small spectral footprint of the technique, and use Raman spectroscopy to study the spatial distribution of different compounds. In this work, an in situ Raman mapping system is developed to be able to relate chemical information with its spatial distribution. Challenges for the development are discussed, including the need for stable positioning and proper data treatment. To avoid focusing problems, nineteenth century porcelain cards are used to test the system. This work focuses mainly on the post-processing of the large dataset which consists of four steps: (i) importing the data into the software; (ii) visualization of the dataset; (iii) extraction of the variables; and (iv) creation of a Raman image. It is shown that despite the challenging task of the development of the full in situ Raman mapping system, the first steps are very promising. This article is part of the themed issue ‘Raman spectroscopy in art and archaeology’.

A non-imaging concentrator for fiber optic mediated remote micro-Raman spectroscopy

1992 ◽  
Vol 50 (2) ◽  
pp. 1518-1519
Author(s):  
B. J. McKinley ◽  
Sang Sheem ◽  
John Lutz ◽  
Fred P. Milanovich
Keyword(s):  
Raman Spectroscopy ◽  
Optical Fibers ◽  
Near Infrared ◽  
Collection Efficiency ◽  
Raman Signal ◽  
Miniature Device ◽  
Moderate Power ◽  
Improved Performance ◽  
Ccd Detectors

The recent availability of moderate power near-infrared diode lasers (780nm) and near-infrared sensitive ccd detectors have caused a noticeable resurgence in the application of Raman spectroscopy in analytical chemistry. We have long maintained an interest in Raman spectroscopy and have established a micro-Raman facility within the Chemistry Department of our organization. Recently, we have taken advantage of the aforementioned progress in spectroscopic equipment and have upgraded our micro-Raman facility to include a ccd detector and an imaging spectrograph.Since our micro-Raman spectrometer is designed around an ellipsoidal collection mirror, with Raman signal being directed through the illumination sample stage it has application to microscopic or small transparent samples. The improved performance of the device and the availability of highly transmissive optical fibers led one of us (B.J.M.) to propose an apparatus that could replace the existing illuminator with a miniature device that maintains a high collection efficiency and can be used remotely or in-situ by utilizing optical fibers.

Non-Destructive Study of the Independence Act of the Mexican Empire of 1821

2011 ◽  
Vol 1319 ◽  
Author(s):  
J.L. Ruvalcaba Sil ◽  
M. Grediaga ◽  
C. González Tirado ◽  
E. Hernández Vázquez ◽  
V. Aguilar Melo ◽  
...  
Keyword(s):  
Twentieth Century ◽  
Raman Spectroscopy ◽  
Infrared Light ◽  
Analytical Methodology ◽  
X Ray ◽  
In Situ Techniques ◽  
History Of ◽  
Iron Gall ◽  
Non Destructive

ABSTRACTIn 2010, Mexico celebrates 200 years since the beginning of the Independence war that gave rise to the independent Mexican Empire in 1821, and afterwards to the Mexican Republic. This document had two original copies; one of them was lost in a fire at the beginning of twentieth century, while the second was stolen and finally returned to Mexico in 1960, after a long history of events. This document is kept in the General Archives of Nation (AGN), Mexico.The “Independence Act of the Mexican Empire of 1821” was written on paper using iron-gall inks. The document has two parts: a declaration and a set of 36 signatures of Iturbide and other people involved in establishing the Independence of Mexico.The non-destructive study of this document was carried out in order to answer several questions: legitimacy, composition of the materials (paper and inks), deterioration conditions and a possible sequence of writing and the signatures. For these purposes several in situ techniques were used: optical microscopy, ultraviolet and infrared light imaging, portable X-ray Fluorescence and Raman Spectroscopy. This work presents the main results of this analytical methodology applied to the Mexican Independence Act. The results indicate that several inks were used in the manuscript and that the paper has an aging consistent with a nineteenth century document. From these results, we consider that the document examined is genuine and not a copy or facsimile of the original act.

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