Distribution of extracts including 4,8-dihydroxy-5-methoxy- 2-naphthaldehyde in Diospyros kaki analyzed by gas chromatography-mass spectrometry and time-of-flight secondary ion mass spectrometry

摘要

The distribution of ethyl acetate extracts and 4,8-dihydroxy-5-methoxy-2-naphthaldchyde (compound I), which is a major constituent of the extracts obtained from the blackened heart-wood of Diospyros kaki, was analyzed via gas chromatography-mass spectrometry (GC-MS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). According to GC-MS, the extracts and compound I arc high in concentration at the pith and at the edges of the blackened heartwood. ToF-SIMS analysis revealed a peak at a mass-lo-charge ratio of (m/z) 218, which is characteristic of the ionic form of compound I. The ToF-SIMS imaging of compound I in the blackened heart-wood based on m/z 218 shows that compound I is located in parenchyma cells and their neighboring axial elements.