Peer-reviewed Articles

The Effect of High Pressure on Ascorbic Acid Structure

May 01, 2020

Spectroscopy

A Raman study of vitamin C, also known as ascorbic acid, is conducted at high pressure to determine phase changes and crystal symmetry through spectral interpretation.

Detection of Food Additives in Drinks by Three-Dimensional Fluorescence Spectroscopy Combined with Independent Components Analysis

April 01, 2020

Spectroscopy

Many foods containing potentially harmful additives are labeled as additive-free. Detecting these additives can be challenging. A rapid method for additive detection is demonstrated using 3D fluorescence spectroscopy combined with an independent component analysis algorithm.

Study of the Changes in Optical Parameters of Diseased Apple Pulps Based on the Integrating Sphere Technique

April 01, 2020

Spectroscopy

By applying vis-NIR spectroscopy, combined with an integrating sphere technique, a method for nondestructive testing of internal lesions in apples has been developed. This work provides a theoretical basis for the nondestructive testing of apples using tissue optical parameters.

Classification of Grassland Desertification in China Based on Vis-NIR UAV Hyperspectral Remote Sensing

March 01, 2020

Spectroscopy

High-precision statistics on desertification of grassland features are an important part of ecosystem research. In this study, a vis-NIR hyperspectral remote sensing system for unmanned aerial vehicles (UAVs) was used to analyze the type and presence of vegetation and soil of typical desertified grassland in Inner Mongolia using a deep belief network and 2D and 3D convolutional neural networks.

LIBS-Based Imaging: Recent Advances and Future Directions

February 01, 2020

ByV. Gardette|V. Motto-Ros|D. Genty|M. Leprince|L. Sancey|F. Pelascini|B. Busser|S. Roux

Spectroscopy

LIBS-based imaging has a broad range of applications. Here, we demonstrate those capabilities with examples from paleoclimate research and toxicology studies.

A Label- and Enzyme-Free Fluorescent Method for the Rapid and Simple Detection of Hg2+ in Cigarettes Using G-Triplexes as the Signal Reporter

February 01, 2020

ByWei Jiang|Xiaoxi Si|Hui Zhao|Junheng You|Yang Zhao|Zhenjie Li|Chunbo Liu|Yuanxing Duan|Juan Li|Qinpeng Shen

Spectroscopy

A novel method was developed for detecting Hg2+ in tobacco, with potential application to mercury detection in environmental water samples.

Improvement of the Limits of Detection for P, S, and Ca Nanoparticle Size in the Absence of Dissolved Analyte Using a Mixed-Gas Plasma in Single-Particle Inductively Coupled Plasma–Mass Spectrometry

January 01, 2020

ByDiane Beauchemin|Joshua Kofsky

Spectroscopy

This study shows, for the first time, that limits of detection (LOD) can be improved for P, S and Ca nanoparticles by the addition of N2 to the plasma flow for single-particle inductively coupled plasma–mass spectrometry (spICP-MS). The work also examined the relative LOD differences using Ar-N2 and Ar-N2-H2 mixed-gas plasmas.

Application of WDXRF and FT-IR for Human Tooth Analysis

December 01, 2019

ByPradeep K. Rai|Vivek K. Singh|Jitendra Sharma|Shikha Sharma|Neha Sharma|Mahima Sharma

Spectroscopy

In this study, WDXRF and FT-IR are used to analyze a tooth sample of a renal patient, and to compare the results to healthy patients. The quantities of multiple elements are reported using the XRF technique, and FT-IR spectroscopy is used to extract relevant information about the molecular contents of the sample with the important absorption bands identified.

Quantum Cascade Laser Infrared Microscopy and 2D IR Correlation Spectroscopy Improves Crystallization Screening of a Protein Complex

November 01, 2019

BySherly Nieves|Belinda Pastrana

Spectroscopy

Well-diffracting crystals are essential for X-ray diffraction of crystallized protein for structural determination. A quantum cascade laser (QCL) infrared microscope is used to determine protein aggregation, distinct from self-association, for the success of the crystallization effort.

Adsorbate-Induced Morphological Changes of PVD-Deposited Nano Island Film SERS Substrates

October 01, 2019

ByDaniel T Kwasnieski|Zachary D Schultz

Spectroscopy

The morphology and gap spacing of nano-island film SERS substrates are key factors defining the properties of analyte‒substrate interactions. These results of the study described here have implications for understanding signal variation in SERS and in designing future SERS assays.