Abstract
Accurate identification of terahertz (THz) absorption peaks of biological macromolecules is of great significance in practical applications. In this work, the experimental and theoretical fundamentals of detecting three plant growth regulators (PGRs), including 6-Benzylaminopurine (6-BA), paclobutrazol (PBZ), and maleic hydrazide (MH) were investigated by using THz time-domain spectroscopy (THz-TDS). THz absorption coefficient and refractive index in frequencies of 0.06–4 THz were obtained. The wavelet threshold de-noising (WTD) method was used to remove spectral noise and improve the signal-to-noise ratio (SNR). The density functional theory (DFT) was applied to the molecular characterization and theoretical calculation of PGRs. Experimental results showed that the three PGRs had unique characteristic absorption peaks. Based on the sym4 wavelet function and four-layer wavelet decomposition, the de-noising performance of hard threshold WTD was better than that of soft threshold WTD. The spectra processed by hard threshold de-noising achieved higher peak SNR (6-BA: 40.22, PBZ: 37.73, MH: 34.83) and lower root mean square error (6-BA: 0.41, PBZ:0.40, MH:0.54). In addition, the characteristic absorption and anomalous dispersion of 6-BA were found at 2.08 and 3.00 THz, those of PBZ were shown at 0.71, 1.30, 1.88, and 2.67 THz, and those of MH were shown at 2.34 THz. The absorption peaks in THz spectra processed by hard threshold WTD were demonstrated to be in good agreement with the simulation results of DFT. These results show the effectiveness of WTD in THz spectral de-noising and the feasibility of using THz-TDS to detect PGRs.
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References
Víctor M. Jiménez, Plant Growth Regulation 47 (2–3), 91 (2005).
A Moons, Vitamins & Hormones 72 (72), 155 (2005).
Ana Coste, Laurian Vlase, Adela Halmagyi, Constantin Deliu, and Gheorghe Coldea, Plant Cell, Tissue & Organ Culture 106 (2), 279 (2011).
Weiqiang Li, Xiaojing Liu, M. Ajmal Khan, and Shinjiro Yamaguchi, Journal of Plant Research 118 (3), 207 (2005).
Dennis Francis and David A. Sorrell, Plant Growth Regulation 33 (1), 1 (2001).
Guanfeng Cui, S. U. Rina, Ge Song, Xinxin Ren, and Xiaoping Hou, Forensic Science & Technology (2017).
Chu Zhang, Hao Jiang, Fei Liu, and Yong He, Food & Bioprocess Technology 10 (1), 1 (2016).
W. Kong, C. Zhang, W. Huang, F. Liu, and Y. He, Sensors 18 (1), 123 (2018).
Si Jie Liu, Chi Guang Fang, Yong Cui, and Nan Jiang, Journal of Food Safety & Quality (2016).
Fangfang Qu, Lei Lin, Chengyong Cai, Tao Dong, Yong He, and Pengcheng Nie, Appl. Sci. 8(3), 420 (2018).
P. H. Siegel, IEEE Transactions on Microwave Theory & Techniques 50 (3), 910 (2002).
L. Duvillaret, F. Garet, and J. L. Coutaz, IEEE J. Sel. Top. Quantum Electron. 2 (3), 739 (2002).
Mira Naftaly and Robert E. Miles, Proc. IEEE 95 (8), 1658 (2007).
P. Nie, F. Qu, L. Lin, T. Dong, Y. He, Y. Shao, and Y. Zhang, Sensors 17 (12), 2830 (2017).
B Fischer, M Hoffmann, H Helm, G Modjesch, and P. Uhd Jepsen, Semiconductor Science & Technology 20 (7), S246 (2005).
Ling Jiang, Miao Li, Chun Li, Haijun Sun, Li Xu, Biaobin Jin, and Yunfei Liu, Journal of Infrared Millimeter & Terahertz Waves 35 (10), 871 (2014).
Hwayeong Cheon, Heejin Yang, Sang Hun Lee, Young A Kim, and Joo Hiuk Son, Scientific reports 6, 37103 (2016).
Nico Vieweg, Mehmet Ali Celik, Sabine Zakel, Vineet Gupta, Gernot Frenking, and Martin Koch, Journal of Infrared Millimeter & Terahertz Waves 35 (5), 478 (2014).
Seung Hyun Baek, Hee Kang Ju, Yeun Hee Hwang, Min Ok Kang, Kyungwon Kwak, and Hyang Sook Chun, Journal of Infrared Millimeter & Terahertz Waves 37 (5), 486 (2016).
K Dolezal, IKrystof V Popa, L Spichal, M Fojtikova, J Holub, R Lenobel, T Schmulling, and M Strnad, Bioorganic & Medicinal Chemistry 14 (3), 875 (2006).
C. Abdul Jaleel, P. Manivannan, B. Sankar, A. Kishorekumar, S. Sankari, and R. Panneerselvam, Process Biochem. 42 (11), 1566 (2007).
J Rank, L. C. Lopez, M. H. Nielsen, and J Moretton, Hereditas 136 (1), 13 (2002).
Junliang Dong, Alexandre Locquet, and D. S. Citrin, Journal of Infrared Millimeter & Terahertz Waves 37 (3), 289 (2016).
Zhen Bao Ling, Pei Yuan Wang, Yun Xia Wan, Yan Zhang Wang, De Fu Cheng, and L. I. Tong-Lin, Chinese Journal of Geophysics 59 (9), 3436(2016).
Dazhong Li, Jie Zhao, Jianping Liu, Wenhe Cai, and Yanhui Ma, North China Electric Power (2016).
O El B'charri, R Latif, K Elmansouri, A Abenaou, and W Jenkal, Biomedical Engineering Online 16 (1), 26 (2017).
Philippe Blanchard and Erwin Brüning, (2015).
H Chermette, J. Comput. Chem. 20 (1), 129 (2015).
Robert G. Parr and Weitao Yang, Annu. Rev. Phys. Chem. 46 (1), 701 (1995).
Y. Cao, T Hughes, D Giesen, M. D. Halls, A Goldberg, T. R. Vadicherla, M Sastry, B Patel, W Sherman, and A. L. Weisman, J. Comput. Chem. 37 (16), 1425 (2016).
Andrei Ipatov, Felipe Cordova, Loïc Joubert Doriol, and Mark E. Casida, Journal of Molecular Structure Theochem 914 (1), 60 (2017).
Steven Pellizzeri, Sean P. Delaney, Timothy M. Korter, and Jon Zubieta, J. Mol. Struct. 1050 (42), 27 (2013).
M. T. Ruggiero, J Sibik, J. A. Zeitler, and T. M. Korter, J. Phys. Chem. A 120 (38), 7490 (2016).
Funding
The authors acknowledge the Shenzhen Institute of Terahertz Technology and Innovation for the technical support. The authors also acknowledge the financial support of the National Key Point Research and Invention Program of the Thirteenth (2016YFD0700304) and National Key Research and Development Plan (2017YFD0700501).
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Qu, F., Pan, Y., Lin, L. et al. Experimental and Theoretical Study on Terahertz Absorption Characteristics and Spectral De-noising of Three Plant Growth Regulators. J Infrared Milli Terahz Waves 39, 1015–1027 (2018). https://doi.org/10.1007/s10762-018-0507-1
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DOI: https://doi.org/10.1007/s10762-018-0507-1