Abstract-Identification of edible oils using terahertz spectrum combined with genetic algorithm and partial least squares discriminant analysis

Ming Yin,   Shoufeng Tang and   Minming Tong  

Anal. Methods, 2016, Accepted Manuscript

DOI: 10.1039/C6AY00259E
http://pubs.rsc.org/en/Content/ArticleLanding/2016/AY/C6AY00259E?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2FAY+(RSC+-+Anal.+Methods+latest+articles)#!divAbstract

The authentication and identification of different edible oils have become a focus of attention in food safety field. In this work, we propose a method for distinction of edible oils by using terahertz (THz) spectrum combined with genetic algorithm (GA) and partial least squares discriminant analysis (PLS-DA). To evaluate the robustness of the model, we also employ full spectra PLS (fsPLS), interval PLS (iPLS), and backward interval (biPLS) algorithms to verify the classification performance through a variable selection. The results demonstrate that the GA-PLS-DA model has a smaller root mean square error of prediction (RESEP), a larger correlation coefficient of prediction (Rp), and higher classification accuracy than other models. In conclusion, the THz spectrum coupled with chemometrics is an effective method for differentiating various types of edible oil.

Abstract-The application of terahertz spectroscopy to liquid petrochemicals detection: A review

Ming Yin^a, Shoufeng Tang^a* & Minming Tong<sup>a

http://www.tandfonline.com/doi/abs/10.1080/05704928.2016.1141291?journalCode=laps20</sup>

Petrochemicals, one of the most important energy sources, contribute to the remarkable development of human civilization. Therefore, the development of a kind of fast, safe, reliable and nondestructive detection technology is essential. Terahertz (THz) spectroscopy, containing abundant physical, chemical, and structural information of materials, shows significant applications in the fields of physics, chemistry, materials science, medicine, pharmacy and biology. As a promising detection technology, THz technology provides a new reliable analytic method in liquid petrochemicals detection due to the fact that low-frequency vibrational and rotational motions of hydrocarbon molecules lie in the terahertz region. In this article, we review the applications of the liquid petrochemicals detection based on the terahertz time-domain spectroscopy (THz-TDS) system, mainly containing the analysis of molecular properties, qualitative identification, quantitative analysis and the terahertz metamaterials sensing. In addition, we propose the further exploration of terahertz technology in the field of petrochemical industry.