Katalin PATONAY, Marietta KORÓZS, Zoltán MURÁNYI, Erika PÉNZESNÉ KÓNYA

Polyphenols in northern Hungarian Mentha longifolia (L.) L. treated with ultrasonic extraction for potential oenological uses

The main objective of this study is to investigate three equalized batches of a wild Mentha longifolia (ML) population fromnorthern Hungary for extractability by gentle ultrasonic extraction, antioxidant activity, and phenolic constituents. This is the firstanalytical investigation in a Hungarian population of this species. Antioxidant properties of ML extracts were evaluated with DPPH,photochemiluminescence-O2-• scavenging assay, FRAP, and total polyphenol measurements. HPLC-DAD determination was performedfor the main phenolic constituents. The extracts are medium or strong antioxidants in DPPH and FRAP assays and show strong O2-•scavenging capacity. Rutin, quercetin, kaempferol, apigenin, naringenin, rosmarinic, vanillic, gallic, syringic, caffeic, and ferulic acidswere identified. All batches were unexpectedly rutin-rich (1700–7500 mg/kg dry herb) and also were rich in rosmarinic acid. Furthercharacteristic traits in the polyphenol profile were a lack of naringenin and (previously not reported) the presence of free kaempferol(up to 30 mg/kg dry herb).

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