Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (9): 1536.doi: 10.7503/cjcu20170233

• Analytical Chemistry • Previous Articles     Next Articles

Special Surface Enhanced Raman Scattering on Lung Cancer Tissues Based on Au/Cu Nanorods Substrate

TONG Ti1*1,2(), ZHAO Yangyang2, FU Yilin1, SHAN Guiye2   

  1. 1. The Second Hospital of Jilin University, Changchun 130041, China
    2. School of Physics, Northeast Normal University, Changchun 130024, China
  • Received:2017-04-13 Online:2017-09-10 Published:2017-08-24
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.11740077, 11774048)

Abstract:

Au/Cu nanorods were prepared by mixing method. The influence of doping copper ions on the plasmon resonance absorption and morphology of gold nanorods was investigated. The plasmon resonance Raman enhancement effect on Au/Cu alloy nanorods was detected. The Raman molecular vibration information of lung cancer tissues and corresponding non-tumor normal tissues were compared on Au/Cu alloy nanorods substrate. Surface enhanced Raman scattering(SERS) analysis of lung cancer tissues and corresponding non-tumor normal tissues demonstrate that the Raman peaks of cancer tissues are stronger compared to non-tumor normal tissues because the SERS signals of protein molecules in lung adenocarcinoma are influenced by their spatial conformation and molecular symmetry. The results suggest that tissue carcinogenesis increases the symmetry of the molecular structure and the Raman peaks near 1250, 1344, 1408, 1568, 1608 and 2560 cm-1 are relevant to amino-compounds of amide Ⅱ in protein, C—H bending vibration, symmetrical variable angle vibration of CH3 in nucleic acids, inert ring vibration of tryptophan in protein and C—O stretching vibration of amide Ⅰ band in protein with intermolecular antiparallel β-fold and sulfhydryl(S—H) stretching vibration of proteins, respectively. The Raman peak near 2936 cm-1 is generated by the joint action of the symmetric stretching vibration of CH2 and the antisymmetric stretching vibration of CH3 in protein. Herein, SERS based on Au/Cu alloy nanorods as substrate is promising to be an effective method for the detection of lung cancer.

Key words: Au nanorods, Copper ion doping, Surface enhanced Raman spectrum, Lung cancer tissue

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