Aigul USUBALİEVA, Vildan EYİZ, Nurzat TOTUBAEVA, İsmail TONTUL

Kırgız Cumhuriyeti Issyk-Kul Bölgesinde Yetişen Yalanci İğde (Hippophae rhamnoides L.) Meyvelerinin Kimyasal Kompozisyonu ve Antioksidan Aktivitesi

Yalancı iğde meyvesi (Hippophae rhamnoides L.) zengin bir besin ve fitokimyasal kaynağıdır. Bu çalışmada, Kırgız Cumhuriyeti'nin Issyk-Kul bölgesinde yetişen yalancı iğde meyvelerinin ağustos ayından kasım ayına kadar olan olgunlaşma döneminde kimyasal bileşimi ve antioksidan aktivitesi belirlenmiştir. Yalancı iğde meyvelerinin antioksidan aktivitesinin belirlenmesinde üç farklı yöntem [ferrik indirgeyici antioksidan güç (FRAP), DPPH radikal süpürücü aktivite (DPPH) ve kuprik iyon azaltıcı antioksidan kapasite (CUPRAC)] kullanılmıştır. Deniz iğdesi meyvelerinin şeker içeriği 6.57-8.08 g/100g, diyet lifi içeriği 0.39-0.83 g/100g, kül içeriği 0.49-0.99 g/100g, lipid içeriği 6.56-6.98 g/100g ve titre edilebilir asitlik değeri %1.38-1.92 arasında belirlenmiştir. Yalancı iğde meyvelerinin toplam fenolik içeriği ve toplam flavonoidleri sırasıyla 408.52-886.48 mg GAE/kg ve 260.81-345.37 mg CE/kg olarak ölçülmüştür. FRAP, DPPH ve CUPRAC ile belirlenen antioksidan aktivite değerleri sırasıyla 88.51-1041.22 mg TE/kg, 1011.93-2673.22 mg TE/kg ve 755.40-1232.55 mg TE/kg olmuştur. Toplam karotenoid içeriği 16.6-18.8 mg/kg olarak ölçülmüştür. Veriler, deniz iğdesi meyvelerinin rengindeki değişim ile kimyasal bileşimi arasındaki ilişkiyi, olgunlaşma aylarına ve hava koşullarının etkisine göre göstermiştir. Tüm bu sonuçlar deniz iğdesi meyvelerinin insan beslenmesinde faydalı olabileceğini göstermekte ve ayrıca fonksiyonel özellikleri zenginleştirmek amacıyla geniş bir ürün yelpazesinde yüksek kullanım potansiyeli vardır.

Anahtar Kelimeler:

Yalancı iğde, Antioksidan aktivite, Fenolik, Flavonoid, Karotenoid

Chemical Composition and Antioxidant Activity of Sea-Buckthorn (Hippophae rhamnoides L.) Grown in Issyk-Kul Region, Kyrgyz Republic

The fruit of sea-buckthorn (Hippophae rhamnoides L.) is a rich source of nutrients and phytochemicals. This study determined the chemical composition and antioxidant activity of sea-buckthorn grown in Issyk-Kul region, Kyrgyz Republic, during maturation from August to November. Three different assays [ferric reducing antioxidant power (FRAP), DPPH radical scavenging activity (DPPH), and cupric ion reducing antioxidant capacity (CUPRAC)] were used to determine the antioxidant activity of sea-buckthorn fruits. Sea-buckthorn fruits had a sugar content of 6.57-8.08 g/100g, a dietary fiber content of 0.39-0.83 g/100g, an ash content of 0.49-0.99 g/100g, a lipid content of 6.56-6.98 g/100g and titratable acidity of 1.38-1.92%. The total phenolic content and total flavonoids of sea-buckthorn fruits were 408.52–886.48mg GAE/kg and 260.81-345.37mg CE/kg, respectively. Antioxidant activity values determined by FRAP, DPPH, and CUPRAC were 88.51-1041.22mg TE/kg, 1011.93-2673.22mg TE/kg, and 755.40-1232.55mg TE/kg, respectively. Total carotenoid content was 16.6-18.8 mg/kg. Results showed the relationship between the change in the color of sea-buckthorn berries and the chemical composition by the months of their ripening and the influence of weather conditions. All these results indicated that sea-buckthorn fruits could be beneficial for human nutrition while they might have a great potential to be used in a wide range of products to enrich their functional properties.

Keywords:

Sea-buckthorn, Antioxidant activity, Phenolic, Flavonoid, Carotenoid Yalancı iğde, Antioksidan aktivite, Fenolik, Flavonoid, Karotenoid,

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