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How does infrared spectrometry identify controlled substances? 

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Vis/Near infrared reflectance spectroscopy appears to be a rapid and convenient non-destructive technique that can measure the quality and compositional attributes of many substances.
Infrared spectra can also be recorded of adsorbed species, and most significantly, this can be done under the rigorously controlled conditions normal to surface studies.
Conversely, if the analysis is done by infrared spectroscopy, much more information is obtained both to confirm the expected contaminants and to identify any unsuspected ones that appear in the spectrum.
CCC/FT-IR (Countercurrent chromatography/Fourier transform infrared) spectrometry is useful for applications where the analyst is not limited by sample size, and high sample loadings are possible.
The system can identify each unknown spectrum within 0.1 s, and is quite efficient for identifying infrared spectra on a personal computer.
The relative simplicity of infrared spectrometry and its ability to give information and composition and temperatures without causing any disturbance of the system being monitored renders the technique particularly useful for on line analysis.
Fourier transform infrared (FTIR) spectrometry is the dominant technique used to measure the infrared (IR) absorption and emission spectra of most materials, with substantial advantages in signal-to-noise ratio (S/N), resolution, speed and detection limits over conventional dispersive spectroscopy.
Near-infrared spectrometry is a new, rapid, and accurate method for measuring fecal fat that does not require a great deal of chemical knowledge and that can be used by anyone.
In the conclusion we indicate how IR spectrometry appears a potentially precious tool to precise the fundamental role we suspect these water molecules play in the reactivity of aqueous media, particularly bio-media.
An advantage of the thermal infrared spectrometry method is that both the temperature and aerosol profiles, which need for retrieval of the vertical profiles of minor compounds, are evaluated from the same spectrum.
We also indicate how IR spectrometry conveys original and precise information from which their hydration mechanisms can be precisely determined in terms of chemical reactions.
Our results clearly indicate that infrared spectroscopy can be used to identify the adapted sample conditions.
Our results suggest that this infrared strategy could be used to identify foodborne pathogens.
This tendency suggests the relevance of other impurities, which were identified by infrared (IR) spectrometry.
Experimental results show the ability of the system to discriminate these substances as far as their infrared spectra differ.
Overall, the study showed that the infrared chromatograph (IRC) was the more efficient and flexible interface for HPLC Fourier transform infrared (FT-IR) spectrometry.

Related Questions

How is FTIR spectroscopy helping in analysis for analytical chemistry?5 answersFTIR spectroscopy is helping in the analysis for analytical chemistry by providing a method to detect the presence of functional groups and molecules directly from a mixed solution of organic molecules. It is useful for monitoring chemical reactions and can accurately predict the concentration of components in these reactions. This is achieved by decomposing the spectrum into peaks with various widths using the wavelet transform and building a sparse linear regression model using the wavelet coefficients. The interpretation of the models is expected to reveal the relation of broad regions in spectra to the model prediction, making it useful for the interpretation of spectra. Additionally, FTIR spectroscopy has been used for the quantification of glucose transport in cell barrier models and for the study of solid-liquid interfaces of heterogeneous catalysts. It has also been applied for the rapid determination of Sudan dye in paprika powder, providing a low-cost alternative to liquid chromatography techniques. Furthermore, FTIR spectroscopy has been used for the structural analysis of RNA, including the analysis of helical parameters and noncanonical base pairing.
How can infrared spectroscopy be used to determine trans fatty acids?5 answersInfrared spectroscopy, specifically Fourier transform infrared (FTIR) spectroscopy, can be used to determine trans fatty acids (TFAs) in various food samples. FTIR spectroscopy offers a rapid and easy-to-use technique for evaluating and monitoring the quality parameters of fats and oils, including TFAs. It can analyze common intrinsic quality parameters such as peroxide value, free fatty acid, moisture, iodine value, and oxidation stability. FTIR-based analytical techniques have been developed for the classification and adulteration detection of fats and oils. The technique has been applied to determine TFAs in edible oils and oils/fat samples extracted from finished products, with good agreement with traditional methods such as gas chromatography. The use of attenuated total reflection (ATR) mode in FTIR spectroscopy has shown equivalent performance to benchtop FTIR spectrometers for the determination of total trans fat content in fats, oils, and lipids extracted from fast foods.
What are the analytical methods used in the determination of narcotic substances from blood and urine?4 answersAnalytical methods used in the determination of narcotic substances from blood and urine include chromato-mass spectrometry, rapid blood sample test by kit, ultra-high performance liquid chromatography–tandem mass spectrometry, and surface plasmon resonance-based gene-nanoparticle system. These methods offer rapid, reliable, and cost-effective detection of narcotic substances in biological fluids. Chromato-mass spectrometry allows for the quantitative determination of multiple substances in urine, with the advantages of fast analysis time and simplified sample preparation. Rapid blood sample tests using kits are preferred for their simplicity and ability to avoid tampering. Ultra-high performance liquid chromatography–tandem mass spectrometry is validated for the detection of new psychoactive substances and other drugs in blood and urine, providing information on emerging drug threats. Surface plasmon resonance-based gene-nanoparticle system offers a simple optical sensor array for the classification of narcotic drugs in aqueous solution and human urine, enabling on-site drug detection and abuse screening.
New psychoactive substances as adulterants of controlled drugs. A worrying phenomenon?5 answersThe use of new psychoactive substances (NPS) as adulterants of controlled drugs is a worrying phenomenon. From 2009 to 2012, 24 NPS belonging to different chemical classes were identified in samples believed to be controlled drugs such as MDMA, amphetamine, ketamine, cocaine, mescaline, or methamphetamine. The most frequently observed NPS adulterant was 2-(4-bromo-2,5-dimethoxyphenyl)ethanamine (2C-B). These combinations of substances pose substantial risks to users, highlighting the need to improve knowledge about their toxicity and the danger of these substances being incorporated into illegal markets. The emergence of NPS has challenged traditional approaches to drug monitoring and control, and there is a need to strengthen detection, identification, and responses to future substances of concern. The prevalence of NPS may be low compared to classical drugs, but the increasing number of deaths due to heroin is a cause for concern.
Is doping control part of forensic toxicology?2 answers
What is an infrared spectroscopy used for with handwriting analysis?5 answers

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