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Frontiers of Optoelectronics

Front Optoelec Chin    2009, Vol. 2 Issue (3) : 244-247     DOI: 10.1007/s12200-009-0052-6
Characterization of spectra of lignin from midribs of tobacco at THz frequencies
Tongfu SU1, Bin YU2, Pengyu HAN3, Guozhong ZHAO2, Changrong GONG1()
1. Department of Tobacco, Henan Agricultural University, Zhengzhou 450002, China; 2. Department of Physics, Capital Normal University, Beijing 100037, China; 3. Center for THz Research, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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The functions of the chemicals are closely related with their compositions and structures. In this paper, we report the characterization of different lignin in the midribs of tobacco leaves using terahertz (THz) time-domain spectroscopy in the frequency range of 0.3 to 2 THz. These lignins are extracted from tobacco leaves grown in different regions. Lignin in midribs of tobacco leaves from the south region and the north region show distinctively different refractive indexes and absorption coefficients at THz frequency. The differences at THz range are found to be correlated with their chemical compositions, which are obtained by way of X-ray micro-analysis. This clearly verifies that it is possible to employ THz time-domain spectroscopy as a tool for identifying the functions of the chemicals and analyzing their chemical compositions.

Keywords terahertz (THz) spectroscopy      lignin      X-ray microanalysis      midribs of tobacco      scanning electron microscope (SEM)     
Corresponding Authors: GONG Changrong,   
Issue Date: 05 September 2009
 Cite this article:   
Tongfu SU,Bin YU,Pengyu HAN, et al. Characterization of spectra of lignin from midribs of tobacco at THz frequencies[J]. Front Optoelec Chin, 2009, 2(3): 244-247.
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Tongfu SU
Bin YU
Pengyu HAN
Guozhong ZHAO
Changrong GONG
Fig.1  Spectra of time-domain and frequency of lignin 2 and lignin 4. (a) Time-domain pulses of reference and after transmission of the two samples; (b) frequency spectra of the two samples
Fig.2  Spectra of refractive index and absorption coefficient of lignin 2 and lignin 4. (a) Spectra of refractive index; (b) spectra of absorption coefficient
samplesmass fractions (w%)
lignin 269.9524.804.410.430.41-
lignin 473.9920.743.780.390.910.20
Tab.1  Element composition and mass fraction of lignin from different distributes
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