Kürşat KORKMAZ, Sümeyye ŞAHİN, Tahsin TONKAZ, Saim Zeki BOSTAN

Destekleme sulamanın fındığın toplam antioksidan kapasitesi ve fenolik miktarına etkisi

Bu çalışmanın amacı, destekleme sulamanın fındığın toplam antioksidan kapasitesi ve fenolik içeriğine etkisini araştırmaktır. Fındık ağaçlarına farklı büyüme evrelerinde sulama yapılmıştır. Antioksidan kapasiteyi belirlemek için numuneler DPPH radikali ile spektrofotometrik bir yöntemle analiz edilmiştir. Toplam fenolik içeriği folin-ciocalteu metodu ile belirlenmiştir. Sonuçlar toplam antioksidan kapasitesinin sulamadan etkilendiğini göstermiştir. Gelişiminin bütün evrelerinde sulanmış (tam sulama) fındık vebu fındıklardan elde edilen yağı alınmış numuneler en yüksek antioksidan kapasite gösterirken, en düşük antioksidan aktivite kontrol gruplarında (sulama yapılmamış) gözlemlenmiştir. Buna karşın, kontrol gruplarına ait yağ örneklerinin antioksidan kapasitesi, gelişiminin ilk evresinde sulamaya tabi tutulan fındık örneklerinin yağlarının antioksidan kapasitesinden daha büyüktür. Bu spektrofotometrik ölçümler, fındık ve yağlarının, lipofilik ve hidrofilik gibi farklı yapısal özelliklere sahip olduğunu ve bu bileşiklerin miktarlarının sulama koşullarına göre değiştiğini doğrulamaktadır. Buna karşılık, sulamaya bağlı olarak, fındık örneklerinin toplam fenolik içeriğinde gözle görülür bir değişim gözlemlenmemiştir.

Effect of supplementary irrigation on total antioxidant capacity and phenolic content of hazelnut

Aim of this study was to investigate the effect ofsupplementary irrigation on the totalantioxidative capacity and total phenolic contentof hazelnuts. Orchard of hazelnut trees wereirrigated at the different growth stagescombinations. To determine antioxidativecapacity, the samples were analyzed by thespectrophotometric assay using the stable DPPHradical. The total phenolic content wasdetermined by the Folin-Ciocalteu assay. Theresults indicated that the total antioxidativecapacity was affected by the irrigationconditions. The hazelnut kernels and defattedhazelnut kernels from irrigated at all growthstages showed the highest antioxidative capacity,while the lowest antioxidative activity wasobserved in control (no irrigation applied). Onthe contrary, the hazelnut kernel oil obtainedfrom control induced higher antioxidativecapacity than irrigated at the first growth stage.These spectrophotometrically measurementsconfirm that hazelnut kernels and their oilscontain antioxidative components havingdifferent structural properties such as lipophilicand hydrophilic character and amounts of thesecompounds were changed by irrigationconditions. In contrast, any notable change oftotal phenolic content was observed in hazelnutsamples, depending on the irrigation condition.

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