Effect of Collection Period and Irrigation Process on Antioxidant Activity and Phenolic Compounds of Olive Leaves

Year 2022, , 122 - 131, 27.07.2022

Nurhan Uslu Mehmet Musa Özcan

https://doi.org/10.24323/akademik-gida.1149746

Cited By: 1

Abstract

Olive leaves have drawn attention because of their contents of bioactive compounds that exhibit antioxidant activity. The aim of this study was to investigate the impact of irrigation on the phenolic compounds and antioxidant activity of olive leaves belonged to different varieties collected between September and December in irrigated and rainfed orchards. Principal components analysis (PCA) was used to explain the effect of variables. The highest total phenolic content was determined in irrigated Ayvalık leaves (1945 mg/100g). Results showed that olive leaves contained significant amounts of flavonoids, ranging from 6379 to 159046 mg/100g. However, differences in antioxidant activity were generally between 1 and 2% regarding irrigation, collection time, and variety. Luteolin-7-glucoside (273-1461 mg/100g) was the main phenolic compound of olive leaves, followed by verbascoside (399-1002 mg/100g). The influence of irrigation showed differences in the amounts of phenolic compounds among the cultivars.

Keywords

Irrigation, Collection time, Olive leaf, Variety, Phenolic compounds

Thanks

We are grateful to TÜBİTAK 2237-A Scientific Education Activities for statistic training.

Zeytin Yapraklarının Antioksidan Aktivite ve Fenolik Bileşenleri Üzerine Sulama İşleminin ve Toplama Periyodunun Etkisi

Abstract

Zeytin yaprakları, antioksidan aktiviteye sahip biyoaktif bileşenleri içermesinden dolayı dikkat çekmektedir. Bu çalışmada, sulanan ve sulanmayan bahçelerden Eylül-Aralık ayları arası toplanan farklı çeşitlere ait zeytin yapraklarının antioksidan aktiviteleri ve fenolik bileşenleri üzerine sulama işleminin etkisi araştırılmıştır. Değişkenlerin etkisini açıklamak için temel bileşenler analizi (PCA) kullanılmıştır. En yüksek toplam fenolik madde içeriği sulanan Ayvalık yapraklarında (1945 mg/100g) belirlenmiştir. Sonuçlar, zeytin yapraklarının 6379-159046 mg/100g arasında önemli miktarda flavonoid içerdiğini göstermiştir. Ancak çeşit, toplama zamanı ve sulama gibi faktörlere göre örneklerin antioksidan aktivitelerindeki farklılık genellikle %1-2 arasında bulunmuştur. Zeytin yapraklarının major fenolik bileşeni luteolin-7-glukozid (273-1461 mg/100g) bulunmuş ve bunu verbaskozid (399-1002 mg/100g) izlemiştir. Sulama işleminin fenolik bileşenlerin miktarı üzerine etkisi çeşitler arasında farklılık göstermiştir.

Keywords

Sulama, Toplama zamanı, Zeytin yaprağı, Çeşit, Fenolik bileşikler

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