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Study of Nondestructive Testing of Nanguo Pear Quality Using Vis-NIR SpectroscopyWe propose a theoretical basis using vis-NIR spectroscopy for the development of an online nondestructive testing system for the quality of Nanguo pear fruit.
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Effect of Tissue Optical Properties on the Fluorescence of BODIPY Derivative as a Photosensitizer for Photodynamic TherapyPhotodynamic therapy is widely used as an established biomedical optical modality for the conservative treatment of tumors. This work investigates laser-induced fluorescence spectroscopy of the emerging photodynamic photosensitizer BODIPY-520 in turbid media.
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Real-Time Chemometric Analysis of Multicomponent Bioprocesses Using Raman SpectroscopyIn this study, a glycerol-fed, lab-scale E. coli bioprocess producing representative pharmaceutical compounds was monitored offline with a portable, high-sensitivity Raman spectrometer.
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Automatic Coal-Rock Recognition by Laser-Induced Breakdown Spectroscopy Combined with an Artificial Neural NetworkAn artificial neural network was combined with LIBS to provide a rapid and accurate coal-rock recognition method for unmanned coal mining.
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Specific Recognition Technology of Infrared Absorption Spectra Based on Continuous Wavelet DecompositionIR absorption spectroscopy technology can solve the problem of line aliasing in gas detection. Here, continuous wavelet transform was used in time-frequency analysis to improve spectral component identification and quantitative detection of gases.
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Characterization of Street Drugs Using Handheld Fourier Transform Raman SpectroscopyHandheld FT-Raman spectroscopy can complement GC–MS and IR in characterizing street drugs.
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Porous Chitosan Composite Membrane Tandem Laser-Induced Breakdown Spectroscopy for Detection of Metal Elements in Liquid SamplesDetecting metal elements in liquid samples cannot be done efficiently by only using LIBS, but when the technique is combined with appropriate membrane materials, rapid analysis of solution samples can be realized.
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Comparison of Peristaltic Pumps Used for Sample Introduction in Inductively Coupled Plasma–Atomic Emission Spectroscopy (ICP-AES)Inductively coupled plasma–atomic emission spectroscopy (ICP-AES) relies on the use of a peristaltic pump for sample introduction. Here, two conventional peristaltic pumps are compared with a new pump based on the “easy click” principle for the analytical figures of merit.
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Exploring the Potential of the Yb(III) (HE)4 Complex for Oncotherapy Using UV-vis SpectroscopyEvaluation of the UV-vis spectra of the reaction product of ytterbium (III) with hematoxylin (HE) indicates the formation of a rare earth complex that further reacts with marine mammal DNA, indicating the potential that this complex may have anti-tumor properties.
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Reliable Chemical Analysis of Aerosols by Reference-Free X-ray Spectrometry for Monitoring Airborne Particulate MatterThis approach provides traceable and reliable quantitative elemental analysis of airborne particles for on-site environmental measurement with portable instrumentation.
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Small-Angle X-ray Scattering from Lamellar StructuresLamellar structures, which are common in many polymeric materials and biological tissues, can diffract X-rays and give rise to reflections at small scattering angles. Analysis of these scattering features can be used investigate the deformation of lamellar structures at the microstructural length.
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Online ATR-FT-IR for Real-Time Monitoring of the Aspirin Esterification Process in an Acid-Mediated ReactionIn this study, the measured spectra of acetic anhydride, acetic acid, salicylic acid, and aspirin are used for in situ monitoring of the progression of aspirin synthesis in a reaction system. Traditional methods such as HPLC and titration ultraviolet (UV) absorption are not optimal for such real-time monitoring because of long analytical times and complicated procedures. ATR-FT-IR offers an alternative solution that overcomes the shortcomings of traditional techniques.
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Stable Variable Selection Method and Comparison for Quantitative Analysis of Steels Using Laser-Induced Breakdown SpectroscopyIn this work, a stable variable selection method based on variable stability correction (VSC) and modified iterative predictor weighting-partial least squares (mIPW-PLS) is proposed for the quantitative analysis of steel samples by laser-induced breakdown spectroscopy (LIBS).
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Cold-Hot Nature Identification of Chinese Medicine Based on an Ultraviolet Chemical FingerprintA model has been developed to predict the “cold” or “hot” nature of Chinese medicines based on UV spectral data.
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A Look at Inorganic Analyses, Proficiency Tests, and Best Practices, Part IIUnderstanding the proper ways to plan, run, and report proficiency tests will help you avoid errors and contamination.
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Discrimination of Geographical Origin for Purple Sweet Potato Using Hyperspectral Imaging Combined with Multivariate AnalysisIn this study, the feasibility of the rapid discrimination of three different geographical origins of purple sweet potato with a hyperspectral imaging (HSI) system was examined.
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Research on Coal Classification Method Based on Terahertz Time-Domain SpectroscopyA proposed solution is a coal species classification method that combines terahertz time-domain spectroscopy with machine learning - specifically, principal component analysis (PCA) and cluster analysis (CA). By using terahertz (THz) time-domain spectroscopy (TDS), the absorption coefficient, dielectric constant, and refractive index of each sample were obtained from lignite, bituminous coal, and anthracite samples.
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Fiberoptic Formaldehyde Field Sensors for Industrial Environments: Capitalizing on Evanescent-Wave SpectroscopyAn inexpensive fiberoptic-based formaldehyde field sensor is described for monitoring low-levels of formaldehyde, a widespread indoor air pollutant, based on the principle of evanescent wave absorption of light. Sensor prototypes following that principle are being tested in two plywood board production plants.
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Prediction of the Harvest Time of Cabernet Sauvignon Grapes Using Near-Infrared SpectroscopyThe results in this study indicate that NIR spectroscopy is a potentially promising approach for the rapid identification of different harvest times of Cabernet Sauvignon grapes, and the proposed technique is helpful for the prediction of ripened and over-ripened Cabernet Sauvignon grapes during the harvest time.
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Reliable Chemical Analysis of Aerosols by Reference-Free X-ray Spectrometry for Monitoring Airborne Particulate MatterThis approach provides traceable and reliable quantitative elemental analysis of airborne particles for on-site environmental measurement with portable instrumentation.
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Determining Nitrophenol Isomers Using Raman SpectroscopyIn this study, the nitrophenol isomers, in solid and liquid phases, were analyzed using Raman spectroscopy, laying the groundwork for determining nitrophenol isomers in environmental monitoring with this technique.
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TOC in Waste and EluatesTuesday, November 8th 2022 at 8:00am PST | 10am CST | 11am EST Due to continuously rising quantities of produced waste worldwide, waste prevention, waste recycling, and environmentally sound disposal are becoming increasingly important. In order to properly recycle or dispose of waste, waste analysis is an essential requirement. Join us to learn about methods and solutions for the highly automated analysis of inhomogeneous sample types and difficult sample matrices.
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Efficient Discrimination of Some Moss Species by Fourier Transform Infrared Spectroscopy and ChemometricsIn combination with attenuated total reflectance (ATR), Fourier transform infrared (FT-IR) spectroscopy can be used to classify different moss species.
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The Fundamentals of Total Reflection X-ray FluorescenceTotal reflection X-ray fluorescence (TXRF) spectroscopy offers impressive performance, providing ultratrace elemental analysis with detection limits reaching the femtogram levels. Here, we provide a tutorial on the technique and the key steps that users should follow.
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QTRam for Content Uniformity Analysis of Low-Dose Pharmaceutical TabletsCompressed tablet is the most common form of orally administered drug. The United States Pharmacopeia (USP) chapter <905> requires that dosage uniformity of such products containing less than 25 mg or less than 25% active pharmaceutical ingredients (API) by weight must be analyzed for content uniformity, which is based on the assay of each API in a number of individual dosage units.
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Effective Abatement of High Lead Level Contamination in a Forensic Firing Range via Inductively Coupled Plasma–Mass SpectrometryTest firing a firearm is frequently used for forensic firearms and bullet identification. Airborne lead-containing particles are emitted when a firearm is tested, leading to lead building up on surfaces, exposing employees to potential lead-related health risks. Prior to cleaning, lead surface concentrations in the firing range at the National Forensic Laboratory Services in Ottawa were found to be higher than the Environmental Abatement Council of Ontario (EACO) post-abatement limit, with the highest level 56 times the limit. Inductively coupled plasma–mass spectrometry (ICP-MS), along with internal standardization, revealed that wiping surfaces with either a commercial decontamination product containing ethylene glycol butyl ether (EGBE) or alcohol cleaning pads satisfied the EACO standard by removing over 90% of lead from test surfaces whereas an external cleaning company only removed 36% of lead from the same surfaces. Fortunately, lead cross-contamination was minimal outside the firearms section and well below the residential EACO limit.
