Determination of antioxidant activities of strawberry tree (Arbutus unedo L.) flowers and fruits at different ripening stages

• Autorzy: Isbilir S.S. , Orak H. H. , Yagar H. , Ekinci N.

Warianty tytułu

PL

Określenie działania przeciwutleniajacego kwiatów i owoców drzewa truskawkowego (Arbutus unedo L.) na różnych etapach dojrzewania

• Języki publikacji: EN

Abstrakty

EN

In this study, the antioxidant activities of Strawberry tree (Arbutus unedo L.) flowers at flowering period and fruits during ripening period were investigated, along with some ripening characteristics such as color, reducing sugar and acidity. Antioxidant activity characteristics were investigated using by the methods of DPPH (1,1-Diphenyl-2- -picryl-hydrazyl) scavenging activity, ȕ-carotene bleaching, reducing power, metal chelating capacity, superoxide anion scavenging and hydrogen peroxide scavenging activity in water, ethanol and methanol extracts. The total phenolic content of flowers in water extracts was found to be 232.38 ± 7.19 mg GAE . g-1 extract, and the DPPH activity was 81.3 ± 0.49% at 50 μg·ml⁻¹ concentration. In the ripening stages, the fully red fruits were determined higher antioxidant capacity than green and yellow fruits, except H₂O₂ scavenging activity which was highest in green fruit. In correlation study, the highest relationship was found between total phenolic content with reducing power (r 2 = 0.987**, P < 0.01), while the lowest with H₂O₂ scavenging activity (r 2 = 0.519*, P < 0.05).

PL

W niniejszej pracy prześledzono działanie przeciwutleniające kwiatów drzewa truskawkowego (Arbutus unedo L.) w okresie kwitnienia oraz owoców w czasie dojrzewania wraz z niektórymi charakterystycznymi cechami dojrzewania, takimi jak kolor, cukier redukujący oraz kwaśność. Zbadano cechy charakterystyczne działania antyoksydacyjnego, posługując się następującymi metodami: oczyszczającą DPPH (1,1-Difenyl-2-pikryl-hydrazyl), wybielaniem ȕ-karotenem, siłą redukującą, zdolnością metali do chelatowania, oczyszczaniem anionami nadtlenku i nadtlenkiem wodoru w wodzie oraz ekstraktach alkoholu etylowego i metylowego. Stwierdzono, że całkowita zawartość fenoli w kwiatach w ekstraktach wodnych wynosi 232,38±7,19 mg GAE/g ekstrakt, zaś działanie DPPH wynosiło 81,3±0,49% przy stężeniu 50 μg·ml⁻¹. W stadiach dojrzewania u całkiem czerwonych owoców stwierdzono wyższą zdolność antyoksydacyjną niż w owocach zielonych i żółtych, oprócz oczyszczającego działania H₂O₂, które było najsilniejsze w owocach zielonych. W badaniu korelacji najsilniejszą zależność stwierdzono pomiędzy całkowitą zawartością fenoli przy mocy redukującej (r 2 = 0.987**, P < 0.01), najsłabszą zaś przy działaniu oczyszczającym H₂O₂ (r 2 = 0.519*, P < 0.05).

• Wydawca: -
• Czasopismo: Acta Scientiarum Polonorum. Hortorum Cultus
• Rocznik: 2012
• Tom: 11
• Numer: 3
• Opis fizyczny: p.223-237,fig.,ref.

Twórcy

autor

Isbilir S.S.

• Department of Food Technology, Vocational School of Technical Sciences, Namik Kemal University, 59030 Tekirdag, Turkey

autor

Orak H. H.

autor

Yagar H.

autor

Ekinci N.

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