This paper investigates the characteristics of leaf tissue extracts from different species of the Arundo donax using different extraction solvents. Flower-leaf Arundo donax and Green-leaf Arundo donax were studied in the article. Three-dimensional fluorescence spectroscopy, ultraviolet-visible absorption spectroscopy, and plant electrochemical fingerprints were employed to study the parameters of the extracts in detail. The three-dimensional fluorescence spectroscopy revealed that the fluorescence component number of the flower-leaved Arundo donax was higher than that of the green-leaved Arundo donax. It is speculated that this increase in the component number was caused by the yellow pigment in the flower-leaved Arundo donax. Ultraviolet-visible absorption experiments indicated that the chlorophyll and carotenoids in Green-leaf Arundo donax were significantly higher than in Flower-leaf Arundo donax. Plant electrochemical fingerprints were tested using polarization curves and electrochemical impedance spectroscopy. The electrochemical fingerprint curves showed that the reduction capacity of electroactive substances in Flower-leaf Arundo donax was lower than that in Green-leaf Arundo donax, but the total amount of electroactive substances in the former was higher. The study also revealed that as the polarity of the extraction solvent increased, it would facilitate the extraction of organic matter from plant leaves but simultaneously lead to a more chaotic impedance spectrum. Therefore, when using impedance spectroscopy for plant classification, it is recommended to prioritize ethanol-water mixed solvents(Volume ratio1:1) as extraction fluids, and pure ethanol should not be used as an extraction solvent.
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Shi et al. (2025) studied this question.
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