Authors


Xiaobo Chen

Latest:

Fluorescence Quenching Effects of Fe3+ Ions on Carbon Dots

The “selective fluorescence quenching effects” of Fe3+ ions on carbon dots are examined to gain a more comprehensive understanding of the interactions of metal ions with a variety of fluorescent materials.


Alexander B. Fialkov

Latest:

Gas Chromatography–Mass Spectrometry (GC–MS) with Cold Electron Ionization (EI): Bridging the Gap Between GC–MS and LC–MS

Gas chromatography–mass spectrometry (GC–MS) with cold electron ionization (EI) is based on interfacing the GC and MS instruments with supersonic molecular beams (SMB) along with electron ionization of vibrationally cold sample compounds in SMB in a fly-through ion source (hence the name cold EI). GC–MS with cold EI improves all the central performance aspects of GC–MS. These aspects include enhanced molecular ions, improved sample identification, an extended range of compounds amenable for analysis, uniform response to all analytes, faster analysis, greater selectivity, and lower detection limits. In GC–MS with cold EI, the GC elution temperatures can be significantly lowered by reducing the column length and increasing the carrier gas flow rate. Furthermore, the injector temperature can be reduced using a high column flow rate, and sample degradation at the cold EI fly-through ion source is eliminated. Thus, a greater range of thermally labile and low volatility compounds can be analyzed. The extension of the range of compounds and applications amenable for analysis is the most important benefit of cold EI that bridges the gap with LC–MS. Several examples of GC–MS with cold EI applications are discussed including cannabinoids analysis, synthetic organic compounds analysis, and lipids in blood analysis for medical diagnostics.


Karthik Jayaraman

Latest:

Applications of Raman Spectroscopy in Solvent Distillation and Exchange During Early-Phase Chemical Synthesis

The case studies presented here successfully demonstrate the use of inline Raman spectroscopic analysis to estimate solvent content during the solvent exchange and distillation operations in the synthesis of active pharmaceutical ingredients.


Rui Wang

Latest:

Porous Chitosan Composite Membrane Tandem Laser-Induced Breakdown Spectroscopy for Detection of Metal Elements in Liquid Samples

Detecting 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.


Chenhui Li

Latest:

Spectral Sensing Using a Handheld NIR Module Based on a Fully Integrated Sensor Chip

A novel approach to NIR spectral sensing, using a miniaturized fully-integrated multipixel array of resonant-cavity-enhanced InGaAs photodetectors, enables sensors with a millimeter-scale footprint and wafer-scale fabrication. This multipixel sensor does not measure the full spectrum, but rather a limited number of spectral regions with limited resolution (50–100 nm).



Shuanggen Huang

Latest:

Identifying Doxycycline Hydrochloride and Tylosin in Chicken Using Surface-Enhanced Raman Spectroscopy

An increasing number of antibiotic residue problems in food have emerged around the world. We examine how SERS is used to identify antibiotic residues in chicken, focusing on doxycycline hydrochloride and tylosin.


Don M. J. van Elst

Latest:

Spectral Sensing Using a Handheld NIR Module Based on a Fully Integrated Sensor Chip

A novel approach to NIR spectral sensing, using a miniaturized fully-integrated multipixel array of resonant-cavity-enhanced InGaAs photodetectors, enables sensors with a millimeter-scale footprint and wafer-scale fabrication. This multipixel sensor does not measure the full spectrum, but rather a limited number of spectral regions with limited resolution (50–100 nm).


Yin Shen

Latest:

Authenticity Identification of Panax notoginseng by Terahertz Spectroscopy Combined with LS-SVM

In this article, it is explored whether THz-TDS combined with LS-SVM can be used to effectively identify the authenticity of Panax notoginseng, a traditional Chinese medicine.


Thomas M. Hancewicz

Latest:

Analysis of Infrared and Raman Imaging Data Using Alternating and Modified Alternating Least Squares

This study explores the enhanced performance of modified alternating least squares (MALS) over alternating least squares (ALS) in analyzing infrared and Raman image spectral data, highlighting the stability and computational efficiency of MALS.


Mike Hennessy Sr.

Latest:

How Pharmaceutical Innovation is Saving the World

The COVID-19 vaccine, and the speed at which it was developed, is the medical breakthrough of our lifetimes.


Leanne Anderson

Latest:

Analysis of Elements in Snack Foods: A Closer Look at Pepperoni, Rice Noodles, Frozen Dinners, and Pizza

Software tools for ICP-MS and ICP-OES can help analysts to simplify method setup and reduce the potential for errors.


Mark R. Witkowski

Latest:

The Use of X-Ray Powder Diffraction (XRD) and Vibrational Spectroscopic Techniques in the Analysis of Suspect Pharmaceutical Products

Here, we compare XRD and FT-IR for analysis of suspect counterfeit pharmaceuticals to determine how the techniques can be used in a complementary fashion.


Andreas Latza

Latest:

Real-Time Chemometric Analysis of Multicomponent Bioprocesses Using Raman Spectroscopy

In this study, a glycerol-fed, lab-scale E. coli bioprocess producing representative pharmaceutical compounds was monitored offline with a portable, high-sensitivity Raman spectrometer.


Shuyan Peng

Latest:

Authenticity Identification of Panax notoginseng by Terahertz Spectroscopy Combined with LS-SVM

In this article, it is explored whether THz-TDS combined with LS-SVM can be used to effectively identify the authenticity of Panax notoginseng, a traditional Chinese medicine.


Ling Gao

Latest:

Comparative Study of Heavy Metals Analysis in Mongolian Medicines Based on High Sensitivity X-ray Fluorescence Spectroscopy and ICP-MS

In this study, X-ray fluorescence (XRF) spectroscopy was used to analyze heavy metals in five traditional Mongolian medicines, and the results were compared to those obtained using ICP-MS.


Martin M. Kimani

Latest:

Analysis of Unlabeled Sibutramine in Dietary Supplements Using Surface-Enhanced Raman Spectroscopy (SERS) with Handheld Devices

This article discusses how FT-IR and SERS is being used to detect counterfeit pharmaceutical drugs.


Xiangqian Feng

Latest:

Studying the Source of Raw Material and Glaze Formula of Sky Green “Ru-type Ware” and Ru Kuan Ware by EDXRF

As this study demonstrates, energy-dispersive X-ray fluorescence (EDXRF) and multivariate statistical analysis can be used to distinguish different classes of historical artifacts, such as ancient pottery—revealing insights about theirs origin and uses.


Li Hai-su

Latest:

Detection of Trace Tin(II) by Salicylfluoroketone Complex Fluorescence Method

A complex fluorescence method utilizing the Sn(II)-salicylfluorescein (SAF)-cetyltrimethylammonium bromide (CTMAB) system demonstrated effective detection of Sn(II) with a linear relationship between its concentration and fluorescence intensity, along with successful application in various sample matrices with high recovery rates.


Liang Sheng-wang

Latest:

Fingerprinting of Mineral Medicine Natrii Sulfas by Fourier Transform Infrared Spectroscopy

We show how FT-IR may be used for quality control analysis of natrii sulfas, a transparent crystalline material used in natural medicine that primarily contains sodium sulfate decahydrate, crystallized from sulfate minerals.


Hang Zhang

Latest:

Simultaneous Detection of Nitrate and Nitrite Based on UV Absorption Spectroscopy and Machine Learning

Regulations have been imposed to set legal limits of nitrate and nitrite in water worldwide. In this study, a highly accurate and optimized ultraviolet (UV) spectroscopy method is proposed to simultaneously monitor nitrate and nitrite for rapid determination and continuous monitoring in environmental water applications.


Guohui Wei

Latest:

Cold-Hot Nature Identification of Chinese Medicine Based on an Ultraviolet Chemical Fingerprint

A model has been developed to predict the “cold” or “hot” nature of Chinese medicines based on UV spectral data.


Idrees F. Al Momani

Latest:

Spectrophotometric and Chemometric Methods for Simultaneous Determination of Antazoline and Naphazoline in Pharmaceutical Eye Drops

This study applied principal component regression (PCR) and partial least squares (PLS) algorithms for the spectrophotometric analysis of a drug containing antazoline hydrochloride (AN) and naphazoline hydrochloride (NP) without chemical separation. Both methods showed high accuracy and precision, with results closely matching those from a reference HPLC method, and were successfully validated for analyzing commercial pharmaceutical products.


Kai-yong Wang

Latest:

Study on Estimating Total Nitrogen Content in Sugar Beet Leaves Under Drip Irrigation Based on Vis-NIR Hyperspectral Data and Chlorophyll Content

The relationship between leaf nitrogen content (LNC) and hyperspectral remote sensing imagery (HYP) was determined to construct an estimation model of the LNC of drip-irrigated sugar beets, to enable real-time monitoring of sugar beet growth and nitrogen management in arid areas.


Ashleigh Farnsworth

Latest:

Raman Spectroscopy: A Key Technique in Investigating Carbon-Based Materials

This article explains the key steps of using Raman technology to investigate carbon and carbon-based materials—such as carbon nanotubes, graphene, and carbon fibers and composites—as well as the process of analyzing the spectra.


Cong Liu

Latest:

Automatic Coal-Rock Recognition by Laser-Induced Breakdown Spectroscopy Combined with an Artificial Neural Network

An artificial neural network was combined with LIBS to provide a rapid and accurate coal-rock recognition method for unmanned coal mining.



Cang Gong

Latest:

Simultaneous Determination of 50 Elements in Geological Samples by ICP-MS Combined with ICP-OES

A method combining inductively coupled plasma–mass spectrometry (ICP-MS) with inductively coupled plasma–optical emission spectrometry (ICP-OES) was developed for multielement determination of 50 species of major, minor, micro, and trace, rare earth, and rare elements in geological samples.



Fei Teng

Latest:

Comparative Study of Heavy Metals Analysis in Mongolian Medicines Based on High Sensitivity X-ray Fluorescence Spectroscopy and ICP-MS

In this study, X-ray fluorescence (XRF) spectroscopy was used to analyze heavy metals in five traditional Mongolian medicines, and the results were compared to those obtained using ICP-MS.