Determination of Antioxidant Activity of Ethanol Extract of Gölevez [(Colocasia esculenta (L.)] Tubers

In this study, the antioxidant activity of the ethanolic extract ofColocasia esculenta tubers were determined by four differentantioxidant tests including DPPH and ABTS radicals scavengingactivities, metal chelating activity and reducing power. Thescavenging effect of extract of C. esculenta tubers and standards onDPPH radical at the highest concentration (600 µg mL-1) decreased inthe following order: Vitamin C˃Trolox˃C. esculenta˃BHA and werefound as 95.4, 93.6, 83.8 and 78.8 %, respectively. The scavengingeffect of C. esculenta tuber extract and standards on ABTS radical atthe highest concentration (100 µg mL-1) decreased in the order: Trolox= BHA˃C. esculenta and were found as 100, 100, 94.6 %, respectively.The metal chelating capacity of extract of C. esculenta tubers andstandards decreased in the order of C. esculenta˃BHA˃Trolox atlowest concentration (100 µg mL-1) and was found to be 78.0, 76.0,63.5 %, respectively. Reducing power of extract of C. esculenta tubersand standards at the highest concentration (600 µg mL-1) followed theorder: BHA˃Trolox˃C. esculenta. Total phenolic compound andflavonoid amounts of C. esculenta tubers were designated as 2400 mgGAE/kg extract and 2050 mg QE/kg extract, respectively.

Gölevez [(Colocasia esculenta (L.)] Yumrularının Etanol Ekstresinin Antioksidan Aktivitesinin Belirlenmesi

Bu çalışmada Gölevez (Colocasia esculenta) yumrularının etanol ekstresinin antioksidan aktivitesi DPPH ve ABTS radikallerini giderme aktiviteleri, metal şelatlama aktivitesi ve indirgeme gücü gibi dört farklı antioksidan metotla belirlendi. C.esculenta yumrularının ekstreleri ve standartların en yüksek konsantrasyonda (600 µg mL-1) DPPH radikali üzerindeki giderme etkisi Vitamin C ˃Trolox˃C.esculenta˃BHA sırasına göre azaldı ve sırasıyla % 95.4, 93.6, 83.8 ve 78.8 olarak bulundu. C. esculenta yumrularının ekstreleri ve standartların en yüksek konsantrasyonda (100 µg mL-1) ABTS radikali üzerindeki giderme etkisi Trolox=BHA˃C.esculenta şeklinde azaldı ve sırasıyla % 100, 100 ve 94.6 olarak bulundu. C.esculenta yumrularının ekstreleri ve standartların en düşük konsantrasyonda (100 µg mL-1) metal şelatlama aktiviteleri C. esculenta˃BHA˃Trolox sırasına göre azaldı ve sırasıyla % 78.0, 76.0 ve 63.5 olarak bulundu. C. esculenta yumrularının ekstreleri ve standartların en yüksek konsantrasyonda (600 µg mL-1) indirgeme güçleri BHA˃Trolox˃C.esculenta şeklinde sıralandı. C.esculenta yumru ekstrelerinin toplam fenolik bileşik ve flavonoid miktarları sırasıyla 2400 mg GAE/kg ekstre ve 2050 mgQE/kg ekstre olarak belirlendi.

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