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Two types of suspension-cultured Aquilaria microcarpa cells, friable and aggregated, were selectively generated. The biosynthetic activities of primary and secondary metabolites in target cells were detected using laser scanning microscopy (LSM) imaging with diphenylboric acid 2-amino ethyl ester (DPBA) and 9-diethylamino-5H-benzo[alpha]phenoxazine-5-one (Nile red) staining. Scanned friable cells produced weakly fluorescent images revealing low productivity of metabolites. On the other hand, scanning of aggregated cells produced clear fluorescent images depicting the accumulations of flavonoids and lipids. Furthermore, abundant deposition of an unknown resinous compound in extracellular portion of aggregated cells could be visualized. The resinous compound was white to whitish-gray in color and highly sedimented in the medium. Based on these observations, we focused our investigation of metabolite productivity on aggregated suspension cells. Some prominent extracellular compounds were detected in the used liquid medium, as well as in the resinous residue within the medium. The characteristics of these metabolites were investigated in detail via gas chromatography-mass spectrometry (GC-MS) analysis.

The Biosynthetic Activities of Primary and Secondary Metabolites in Suspension Cultures of Aquilaria microcarpa