Fig. 4. Validation of the sensing system with the crude methanol extracts of L. japonica. (a) The chemical structures and molecular weights of the reported terminal alkyne-containing natural products 6a–d in the leaves of L. japonica and the corresponding triazolylcoumarins 7a–d; (b) the LC chromatogram (at 345 nm) of the off-bead sample from the methanol extract of the leaves of L. japonica; (c) the LC chromatogram (at 345 nm) of the off-bead sample from the methanol extract of the stem heartwood of L. japonica.
