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Chestnut ( Castanea sativa Miller.) burs (CSB) represent a solid waste produced during the edible fruit harvesting. Their usual disposal in the field increases the environmental and economic impact of the agricultural process. HPLC-UV-HRMS profiling revealed that CSB organic and aqueous extracts (CSB-M, CSB-H, CSB-A) contain several hydrolyzable tannins, mainly ellagitannins, and glycoside flavonols. Ellagic acid (EA) and chestanin are predominant components (5⁻79 and 1⁻13 mg/g dry extract, respectively). NMR analysis confirmed the chemical structures of the major constituents from CSB-M. The extracts displayed a significant scavenging activity against DPPH (EC 50 12.64⁻24.94 µg/mL) and ABTS⁺ radicals (TEAC value 2.71⁻3.52 mM Trolox/mg extract). They were effective in inhibiting the mycelial growth (EC 50 6.04⁻15.51 mg/mL) and spore germination (EC 50 2.22⁻11.17 mg/mL) of Alternaria alternata and Fusarium solani . At the highest concentration, CSB-M was also active against Botrytis cinerea both in mycelium and spore form (EC 50 64.98 and 16.33 mg/mL). The EA contributed to the antifungal activity of extracts (EC 50 on spore germination 13.33⁻112.64 µg/mL). Our results can support the upgrading of chestnut burs from agricultural wastes to a resource of natural fungicides for managing fruit and vegetable diseases.

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Chestnut (Castanea sativa Miller.) Burs Extracts and Functional Compounds: UHPLC-UV-HRMS Profiling, Antioxidant Activity, and Inhibitory Effects on Phytopathogenic Fungi