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[Distinguishing Chinese medicinal herbs by chemical oscillating fingerprints]

Zongxiao Li1, Chunlan Yuan

  • 1Department of Chemistry and Chemical Engineering, Baoji College of Arts and Science, Baoji, Shaanxi, 721007.

Zhong Yao Cai = Zhongyaocai = Journal of Chinese Medicinal Materials
|June 8, 2004
PubMed
Abstract

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
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