Qualitative and quantitative identification of nitrofen in terahertz region

Wang, Qiang; Ma, Yong

doi:10.1016/j.chemolab.2013.05.011

Cited by 31 publications

(8 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The amount of energy of THz radiation that goes through the medium relative to that penetrates the background indirectly reflects the absorbance of the medium. The capacity of THz to qualitatively and quantitatively detect proteins has been confirmed by Xie et al [27] and Wang et al [28]. Hence penetrated energy of THz radiation provides us a way to detect the microscopic mechanism of the medium to achieve the protein quantity.…”

Section: Introductionmentioning

confidence: 65%

Label-free protein detection using terahertz time-domain spectroscopy

Han

Yan

Wei

et al. 2016

The 8th International Symposium on Ultrafast Phenomena and Terahertz Waves

View full text Add to dashboard Cite

Protein analysis is the foundation to understanding the mechanisms of complex biological processes. As one of the most widely used techniques to determine protein species and contents, protein dot blot aids biology research but needs corresponding antibodies for marking. A label-free detection method based on terahertz time-domain spectroscopy (THz-TDS) is proposed and demonstrated to improve this traditional technology. A membrane loaded with protein samples is directly scanned using a transmission THz-TDS system for spectral imaging. Different kinds of proteins can be distinguished by the refractive index extracted from the THz transmission spectrum. The intensity or shade imaged with the THz transmission spectrum can help detect the protein quantitatively. The feasibility of this new protein assay is demonstrated by the results of systematic testing with actual samples prepared with the dot-blot protocol.

show abstract

Section: Introductionmentioning

confidence: 65%

Label-free protein detection using terahertz time-domain spectroscopy

Han

Yan

Wei

et al. 2016

The 8th International Symposium on Ultrafast Phenomena and Terahertz Waves

View full text Add to dashboard Cite

show abstract

“…For comparison, PLS and BP neural networks, which are widely used as qualitative identification methods that do not need to obtain the spectrum of each component in mixtures in advance, were also tested in our case [28], [29]. PLS is a multivariate statistical analysis algorithm, which can process a large number of correlated data.…”

Section: Resultsmentioning

confidence: 99%

Qualitative and Quantitative Identification of Components in Mixture by Terahertz Spectroscopy

Peng

Shi

et al. 2018

IEEE Trans. THz Sci. Technol.

View full text Add to dashboard Cite

Typical methods for the analysis of mixture components include multiple linear regression, partial linear squares, and artificial neural network. However, these methods need large amount of samples and time to improve recognition accuracy. In this paper, based on the data obtained from terahertz spectroscopy, an identification method with less sample requirements and lower calculation time but higher accuracy is proposed. Based on the wavelet transform, baseline elimination, support vector regression, and loop iteration of samples, the specific substance in the mixture can be identified effectively. For example, seven substances that exist in brain glioma are chosen as the components of a mixture, where the key substances used for glioma diagnosis are set as the target substances and the spectra of mixtures with different mix proportions serve as training data. The average correlation coefficient of identification achieves 99.135% and the root-mean-square error is 0.40%. These results have profound implications for the eventual practical application of exact qualitative and quantitative identification of components in mixtures. Index Terms-Mixture identification, terahertz (THz) spectroscopy. I. INTRODUCTION T ERAHERTZ (THz) radiation is the electromagnetic radiation in the frequency interval from 0.1 to 10 THz. Due to its low photon energy (4 meV @ 1 THz), THz wave offers the advantages of being noninvasive and nonionizing, thus presenting little harm to biological tissue [1]-[4]. Combining good accuracy, sensitivity, and rapidity, THz spectroscopy has been

show abstract

“…The femtosecond laser is a commercial mode-locked Ti: sapphire laser (Spectra Physics Mai Tai), which produces 100 fs pulse with a repetition rate of 80MHz. The total optical path of THz-TDS system for material spectral data collected refers to the literature [5].…”

Section: Methodsmentioning

confidence: 99%

“…It is one of bactericides, which has been widely used to prevent and control the wheat rust, powdery mildew of many kinds of crops. The terahertz (THz) spectroscopy technique is becoming a prevalent analytical method for the study of molecular in the solid field [1][2], ranging from pharmaceutical researches [3], to chemical materials qualitative and quantitative analysis [4][5], These experiments and theoretical studies have demonstrated great promise for using THz technique for detection, identification, and characterization of compounds.…”

Section: Introductionmentioning

confidence: 99%

The terahertz spectroscopic investigation and vibration analysis of triadimefon

Wang

2016

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

The terahertz spectra of triadimefon has been investigated using time-domain THz spectroscopy (THz-TDS) in the range of 0.4~2.0 THz. Calculations of the vibrational modes and intensities are carried out using solid-state density functional theory (DFT) with periodic boundary condition employing the B3LYP and PW91 density functions. Good agreement between the calculated and experimentally measured spectra has been achieved where isolated-molecule calculations fail to reproduce the observed spectral characters. These simulations reveal that the solid-state DFT calculations provide high quality structural and spectral reproductions. All the experimental THz absorption peaks are assigned utilizing the PW91 and BLYP method.

show abstract

Qualitative and quantitative identification of nitrofen in terahertz region

Cited by 31 publications

References 22 publications

Label-free protein detection using terahertz time-domain spectroscopy

Label-free protein detection using terahertz time-domain spectroscopy

Qualitative and Quantitative Identification of Components in Mixture by Terahertz Spectroscopy

The terahertz spectroscopic investigation and vibration analysis of triadimefon

Contact Info

Product

Resources

About