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Blueberry juices produced in China and in Italy were analyzed by means of Raman spectroscopy. The reference data of important nutraceutical indicators such as degrees Brix and carbohydrates were available. Some juices were produced from fresh organic fruits, while others were industrial grade, differing in qualities and prices. Raman spectra obtained with excitation at 1064 nm were acquired using...
The current diagnostic standard for detection of bladder tumors is standard white light cystoscopy. The major concerns related to cystoscopy include its invasive, causes discomfort to the patient and also misses flat tumors such as carcinoma in situ (CIS). Grading and staging of tumors would help the clinician for selecting the proper treatment thereby preventing recurrence and progression of bladder...
In this work it is presented a photophysical study of thin films based on excited-state intermolecular proton transfer dyes 2-(4′amino-2′-hydroxyphenyl)benzoxazole (AHPBO) and 2-(4′aminophenyl)benzoxazole (APBO). The studied thin films were characterized by Raman Spectroscopy, Atomic Force Microscopy, as well as Photoluminescence and UV-Vis absorption spectroscopies. In addition, theoretical calculations...
The paper presents the synthesis as well as optical, structural and morphological characterization of CdS nanoparticles embedded in silico-phosphate thin films, as a promising luminescence temperature sensing material. The films were synthesized by sol-gel method, spin coating technique. UV-Vis (Ultraviolet-Visible) ellipsometric absorption is specific to CdS semiconductor nanoparticles with a cut-off...
Raman spectroscopy was used to measure a collection of honeys belonging to three botanical origins: chestnut, acacia, and citrus, respectively. The excitation wavelength was set at 1064 nm to mitigate fluorescence effects, and a dispersive detection scheme was used, thus allowing compactness of the optical system. The spectroscopic data were processed using Principal Component Analysis for data dimensionality...
Recently portable Raman probes have emerged into markets with a variety of applications including carbon nanotube (CNTs) characterization. Aqueous dispersed carbon nanotubes (CNTs) have shown a lot of promise towards biomedical application like drug / gene delivery vectors, photo-thermal therapy, and photoacoustic imaging. In this study we report the simultaneous detection and irradiation of carbon...
In this paper, the problem of estimating the fluorescence background of a Raman spectrum was addressed. We proposed to remove the fluorescence background via curve fitting. Furthermore, wavelet packet transform was chosen to compress Raman spectra data in case the data need large space to store and long time to search. We presented two methods for data processing in Raman spectroscopy of high methoxy...
This paper takes a novel approach to the problem of characterising electrical ageing in solid dielectrics through ex-situ experiments that seek to reproduce the chemistry of electrical treeing in bulk. Plaque specimens of a range of polymers, including polyethylene, polystyrene, polyether ether ketone and silicone rubber, were subjected to surface ageing via corona discharge in air or in a closed...
This paper studies the preparation procedure of nanostructured (LaxBa1-x)B6 cathode materials by liquid phase reactive spark plasma sintering. The phase identification and purity of the sintered samples is determined by X-ray diffraction (XRD) and X-ray fluorescence. The vibrational property is examined by using Raman spectroscopy. The SEM and electron back-scattered diffraction (EBSD) investigation...
Spatially Offset Raman Spectroscopy (SORS) and Transmission Raman Spectroscopy (TRS) are methods for analysing bulk turbidly scattering materials such as powders, tablets, suspensions and other chemical mixtures, and provides non-invasive measurements with high selectivity and sensitivity. They can be effectively used for non-invasive probing of the content of pharmaceutical capsules and tablet and...
This paper presents a computational framework for chemical profiling of the plant cell wall through the Raman spectroscopy. The system enables query of known spectral signatures and clustering of spectral data based on intrinsic properties. As a result, presence and relative concentration of specific chemical bonds can be quantified. The primary contribution of this paper is in representation of Raman...
Raman spectroscopy provides a non-invasive method to study biological samples. We demonstrate the powerful capabilities of our novel Raman modulation technique to detect weak Raman signals hidden by a strong fluorescent background.
The article consists of a Powerpoint presentation on optical technologies for early GI cancer detection. The areas discussed include: optical diagnostics; white-light endoscopy; optical coherence tomography; microendoscopy; endocytology; fluorescence endoscopy; Raman spectroscopy; confocal microscopy; diffuse reflectance spectroscopy and elastic scattering spectroscopy etc. etc.
Laser-induced fluorescence and Raman spectroscopy of serum for detect colon cancer was investigated in this paper. The difference to serum spectrum was discovered. Three Raman peaks were consistently observed from normal blood serum emission using 488.0 nm and 514.5 nm excitation of an Ar-ion laser. While no Raman peak or slight Raman peaks were detected from colon cancer's cases. In addition, the...
Laser-induced fluorescence (LIF) and Raman spectra were measured from normal and tumorous human serum in an attempt to discover some values useful in discrimination between normal and tumorous cases. Red shift of fluorescence peak and decrease of fluorescence intensity were observed after samples radiated by laser. According to one thousand twenty-two samples' spectra, three parameters alpha, beta...
Laser-induced fluorescence spectroscopy (LIF) and Raman spectrum of serum for diagnosis of rectum cancer were investigated by criteria of three parametric modes in this paper. The aim of this study was in an attempt to find the difference normal and rectum cancer cases, therefore 89 rectum cancer samples were measured using fluorescence and Raman spectrum. The experimental result showed that there...
In this paper, laser induced human serum Raman spectra of liver cancer are measured. The spectra in serum differences between normal people and liver cancer patients are analyzed. For the typical spectrum of normal serum, there are three sharp Raman peaks and relative intensity of Raman peaks excited by 514.5 nm is higher than that excited by 488.0 nm. However, for the Raman spectrum of liver cancer...
We present a three parametric model using Raman and fluorescence spectroscopy for detection and analysis of esophagus dysphasia and esophagus cancer. The model was set up from more than 200 samples. And 40 samples were used to test this algorithm of the model prospectively. The serum spectra were excited by laser of the wavelength 488.0 nm and 514.5 nm. The apparent differences of auto-fluorescence...
A multiband Quasi-Analytical Algorithm (QAA) was proposed by Lee et al. in 2002. It can be used to quickly retrieve the total absorption coefficients, particle back scattering coefficients, and absorption coefficients of phytoplankton pigment and colored dissolved organic matter (CDOM) etc for optically deep water. Effects of inelastic scattering, e.g., Raman scattering and CDOM fluorescence, were...
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