Related Experiment Video
Updated: May 16, 2026
08:49
Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
Published on: December 1, 2023
A simple approach to quantitative analysis using three-dimensional spectra based on selected Zernike moments
Hong Lin Zhai1, Yue Yuan Zhai, Pei Zhen Li
1College of Chemistry & Chemical Engineering, Lanzhou University, Lanzhou, 730000, PR China. zhaihl@163.com
The Analyst
|November 28, 2012
Summary
This study introduces a simple quantitative analysis method using digital image processing of 3D spectra from HPLC-DAD. Zernike moments enable reliable analysis of compounds in mixed samples.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Digital Image Processing
Background:
- Quantitative analysis of mixed compounds is challenging.
- High-performance liquid chromatography with diode array detection (HPLC-DAD) generates 3D spectral data.
- Digital image processing offers novel analytical approaches.
Purpose of the Study:
- To develop a simple and reliable quantitative analysis method for mixed compounds.
- To utilize 3D HPLC-DAD spectra and digital image processing techniques.
- To establish linear quantitative models using Zernike moments.
Main Methods:
- High-performance liquid chromatography coupled with a diode array detector (HPLC-DAD) for data acquisition.
- Digital image processing of 3D spectra.
- Application of Zernike moments as region-based shape features.
- Linear modeling and stepwise regression for quantitative analysis.
Main Results:
- Three linear quantitative models were successfully established for analyzing three compounds in mixed samples.
- Correlation coefficients (R(2)) for both training and test sets exceeded 0.999.
- Statistical validation confirmed the reliability and accuracy of the developed models.
Conclusions:
- The proposed method using Zernike moments offers a new approach for quantitative analysis of 3D spectra.
- This technique is reliable for analyzing target compounds in complex mixtures.
- The methodology can be extended to analyze other 3D spectral data from various sources.
Related Concept Videos
01:12Two-Dimensional (2D) NMR: Overview
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
01:21Mass Spectrometry: Complex Analysis
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
01:29Three-Dimensional Analysis of Strain
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for electronic transitions. As a result...
01:28Three-Dimensional Microscopy in Microbiology
Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
01:20Raman Spectroscopy: Overview
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...