Quantitative Analysis of Paracetamol, Acetylcysteine and Guaifenesin in Commercial Cold Medicines by UV-Vis Spectroscopy

2014 ◽  
Vol 1 (1) ◽  
pp. 40-47
Author(s):  
Aysel KÜÇÜK TUNCA ◽  
Keyword(s):  
Quantitative Analysis ◽  
Vis Spectroscopy

scholarly journals Total Hyptolide of Indonesian Hyptis pectinata extracts in a various solvent using HPLC and UV-Vis spectroscopy and their toxicities

2019 ◽  
Vol 22 (6) ◽  
pp. 305-309
Author(s):  
Meiny Suzery ◽  
Siti Khumairoh ◽  
Bambang Cahyono
Keyword(s):  
Quantitative Analysis ◽  
Toxicity Test ◽  
Brine Shrimp ◽  
Uv Spectroscopy ◽  
Bioactive Compound ◽  
Dry Weight ◽  
Pure Compound ◽  
Standard Curve ◽  
Lc50 Value ◽  
Vis Spectroscopy

The bioactive compound of hyptolide has been isolated from an Indonesian plant Hyptis pectinata using various solvents. The pure compound was then used as a standard in quantitative analysis using HPLC and UV-Vis spectroscopy in ethanol (EEth), ethyl acetate (EEa), acetone (Eac) and hexane (Ehex) extract each earned 3.14%, 0.01%, 1.33% and 0.04% (dry weight per sample). The standard curve of hyptolide using UV spectroscopy has been obtained with the coefficient of relationship (r) of 0.997. However, the use of spectroscopy was not recommended for the standardization of hyptolide in the extract due to interference from other compounds that absorb the same wavelength. Furthermore, the toxicity test using the Brine Shrimp lethality test shows LC50 value of 92-181 ppm, which was in EEa compared to EEth, Eac, and Ehex.

The Good Vibrations of Beer. The Use of Infrared and UV/Vis Spectroscopy and Chemometry for the Quantitative Analysis of Beverages

2012 ◽  
Vol 67 (10) ◽  
pp. 1005-1015 ◽  
Author(s):  
Oliver Klein ◽  
Andreas Roth ◽  
Fabian Dornuf ◽  
Otmar Schöller ◽  
Werner Mäntele
Keyword(s):  
Multivariate Analysis ◽  
Quantitative Analysis ◽  
Entire Range ◽  
Flow Cell ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Calibration Data ◽  
Vis Spectroscopy ◽  
Calibration Sets ◽  
Laboratory Reference

Infrared spectroscopy in combination with a specially developed attenuated total reflection (ATR) flow cell and multivariate analysis was used for the quantitative analysis of beer and other beverages. IR spectra of samples were obtained in the range from below 1000 cm-1 to 4000 cm-1 and subjected to a multivariate analysis based on calibration sets with laboratory reference standards. In the case of beer, this calibration set included 240 beer samples spanning the entire range of ethanol content, extract and CO2. Based on this calibration, an infrared and UV/Vis spectroscopy-based sensor for the quick and quantitative quality control of beer was developed and subjected to extensive tests in breweries. This sensor meets and exceeds all requirements from brewers for the routine control in the production and bottling. Its use for other beverages, for example wine, juices or apple wine, requires only another set of calibration data for the specific beverage.

scholarly journals Reversible Öffnung von Metall-Metall-Bindungen: Quantitative Untersuchung des Ringöffnungsgleichgewichts von [Cp′(CO)2Mn]2SeAryl+ / Reversible Opening of Metal Metal Bonds: Quantitative Analysis of the Ring Opening Equilibrium for [Cp′(CO)2Mn]2SeAry1+

1991 ◽  
Vol 46 (6) ◽  
pp. 719-728 ◽  
Author(s):  
Patrizia Lau ◽  
Gottfried Huttner ◽  
Laszlo Zsolnai
Keyword(s):  
Quantitative Analysis ◽  
Steric Hindrance ◽  
Ring Opening ◽  
Valence Bond ◽  
Lone Pair ◽  
Metal Bond ◽  
Vis Spectroscopy ◽  
Metal Metal ◽  
Different Temperatures ◽  
Metal Bonds

The compounds [Cp′(CO)2Mn]2SeR+ are isoelectronic analogues of the well known “inidene”-species [LnM]ER (E = P, As, Sb, Bi). While these latter “inidene” compounds exist in an open form with no metal-metal-interaction and the main group atom in a trigonal planar environment allowing for a three-center-4π-system MEM, their isoelectronic selenium analogues generally show equilibria between the “inidene”-type metal metal non bonded forms and their metal metal bond closed cyclic isomers. In a valence bond picture the four electrons, delocalized in the three-center-4π-system of the open isomers, are localized in the closed ones: two in the metal metal bond and two as a lone pair at a pyramidally coordinated selenium center.The corresponding equilibria are quantitatively analyzed for [Cp′(CO)2Mn]2SeR+ (R =PCF3-C6H4 (1), PCH3-C6H4 (PToI) (2), °CH3—C6H4 (°Tol) (3)) by UV/VIS spectroscopy of their solutions at different temperatures. The ring opening process which corresponds to the reversible opening of a metal metal bond is found to be entropically driven with reaction-entropies of around 25 [JΚ-1mol-1]. Correspondingly, imposing steric hindrance on R, [Cp′(CO)2Mn]2SeMes+ (4) yields a stable bond opened “inidene”-type compound. Reducing steric hindrance in [Cp′(CO)2Mn]2Se′Pr+ (5) gives the bond closed form as the only detectable isomer.

An Improved Quantitative Image Analyser

1977 ◽  
Vol 35 ◽  
pp. 226-227
Author(s):  
J.P. Fallon ◽  
P.J. Gregory ◽  
C.J. Taylor
Keyword(s):  
Feature Extraction ◽  
Quantitative Analysis ◽  
Frequency Content ◽  
General Sense ◽  
Physical Measurements ◽  
Quantitative Image ◽  
Image Analyser ◽  
Automatic Methods ◽  
Quantitative Results

Quantitative image analysis systems have been used for several years in research and quality control applications in various fields including metallurgy and medicine. The technique has been applied as an extension of subjective microscopy to problems requiring quantitative results and which are amenable to automatic methods of interpretation.Feature extraction. In the most general sense, a feature can be defined as a portion of the image which differs in some consistent way from the background. A feature may be characterized by the density difference between itself and the background, by an edge gradient, or by the spatial frequency content (texture) within its boundaries. The task of feature extraction includes recognition of features and encoding of the associated information for quantitative analysis.Quantitative Analysis. Quantitative analysis is the determination of one or more physical measurements of each feature. These measurements may be straightforward ones such as area, length, or perimeter, or more complex stereological measurements such as convex perimeter or Feret's diameter.

Quantification of Silica Uptake by Alveolar Macrophages - An Emperical Scanning Electron Microprobe Method

1982 ◽  
Vol 40 ◽  
pp. 332-333
Author(s):  
V. V. Damiano ◽  
R. P. Daniele ◽  
H. T. Tucker ◽  
J. H. Dauber
Keyword(s):  
Quantitative Analysis ◽  
Alveolar Macrophages ◽  
Bulk Sample ◽  
Silica Particles ◽  
Empirical Method ◽  
Phagocytic Cells ◽  
Calibration Standards ◽  
X Ray ◽  
Accurate Quantitative Analysis ◽  
Scanning Electron

An important example of intracellular particles is encountered in silicosis where alveolar macrophages ingest inspired silica particles. The quantitation of the silica uptake by these cells may be a potentially useful method for monitoring silica exposure. Accurate quantitative analysis of ingested silica by phagocytic cells is difficult because the particles are frequently small, irregularly shaped and cannot be visualized within the cells. Semiquantitative methods which make use of particles of known size, shape and composition as calibration standards may be the most direct and simplest approach to undertake. The present paper describes an empirical method in which glass microspheres were used as a model to show how the ratio of the silicon Kα peak X-ray intensity from the microspheres to that of a bulk sample of the same composition correlated to the mass of the microsphere contained within the cell. Irregular shaped silica particles were also analyzed and a calibration curve was generated from these data.

Lateral resolution of the electron microbeam analysis

1978 ◽  
Vol 36 (1) ◽  
pp. 542-543
Author(s):  
H.J. Dudek
Keyword(s):  
Quantitative Analysis ◽  
Depth Resolution ◽  
Lateral Resolution ◽  
Cylindrical Particle ◽  
Correction Procedure ◽  
X Ray ◽  
Element Concentrations ◽  
Microbeam Analysis ◽  
The Matrix

The chemical inhomogenities in modern materials such as fibers, phases and inclusions, often have diameters in the region of one micrometer. Using electron microbeam analysis for the determination of the element concentrations one has to know the smallest possible diameter of such regions for a given accuracy of the quantitative analysis.In th is paper the correction procedure for the quantitative electron microbeam analysis is extended to a spacial problem to determine the smallest possible measurements of a cylindrical particle P of high D (depth resolution) and diameter L (lateral resolution) embeded in a matrix M and which has to be analysed quantitative with the accuracy q. The mathematical accounts lead to the following form of the characteristic x-ray intens ity of the element i of a particle P embeded in the matrix M in relation to the intensity of a standard S

An example of spectrum imaging used for comparison of EELS quantitative analysis techniques on Al-Li

1991 ◽  
Vol 49 ◽  
pp. 726-727
Author(s):  
John A. Hunt
Keyword(s):  
Quantitative Analysis ◽  
Large Data ◽  
Difference Spectrum ◽  
Large Data Sets ◽  
Foil Thickness ◽  
Data Sets ◽  
Analysis Techniques ◽  
Spectrum Imaging ◽  
Normal Spectrum ◽  
Electron Energy Loss

Spectrum-imaging is a useful technique for comparing different processing methods on very large data sets which are identical for each method. This paper is concerned with comparing methods of electron energy-loss spectroscopy (EELS) quantitative analysis on the Al-Li system. The spectrum-image analyzed here was obtained from an Al-10at%Li foil aged to produce δ' precipitates that can span the foil thickness. Two 1024 channel EELS spectra offset in energy by 1 eV were recorded and stored at each pixel in the 80x80 spectrum-image (25 Mbytes). An energy range of 39-89eV (20 channels/eV) are represented. During processing the spectra are either subtracted to create an artifact corrected difference spectrum, or the energy offset is numerically removed and the spectra are added to create a normal spectrum. The spectrum-images are processed into 2D floating-point images using methods and software described in [1].

The use of a Bent Grid to Improve the take-Off Angle for Electron Probe Analysis

1976 ◽  
Vol 34 ◽  
pp. 360-361
Author(s):  
Delbert E. Philpott ◽  
David Leaffer
Keyword(s):  
Quantitative Analysis ◽  
Tilt Angle ◽  
Count Rate ◽  
Electron Probe ◽  
Open Area ◽  
Electron Probe Analysis ◽  
Background Ratio ◽  
Probe Analysis

There are certain advantages for electron probe analysis if the sample can be tilted directly towards the detector. The count rate is higher, it optimizes the geometry since only one angle need be taken into account for quantitative analysis and the signal to background ratio is improved. The need for less tilt angle may be an advantage because the grid bars are not moved quite as close to each other, leaving a little more open area for observation. Our present detector (EDAX) and microscope (Philips 300) combination precludes moving the detector behind the microscope where it would point directly at the grid. Therefore, the angle of the specimen was changed in order to optimize the geometry between the specimen and the detector.

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