Hacer Çoklar

Evaluation of antioxidant activity, phenolic, mineral contents and some physicochemical properties of several pine honeys collected from Western Anatolia

In this study, the qualities of 15 red pine honey samples from different parts of the Muğla province in Turkey were evaluated. Important chemical parameters such as °Brix, pH, moisture, ash, electrical conductivity, free acidity, proteins, diastase activity, hydroxymethylfurfurale, total reducing sugar, reducing sugar, sucrose, the five common physical parameters refractive index, density, water activity, dynamic viscosity and color index (L*,a* and b*), and mineral compositions, including potassium, sodium, magnesium, phosphorus, calcium, iron, copper, zinc, manganese, nickel, aluminum, boron, molybdenum, and chromium, were determined. Pine honey samples also were analyzed for total phenolic contents and antioxidant activity. The antioxidant activities were evaluated based on the ability of the pine honey extracts to scavenge 1,1-diphenyl-2-picrylhydrazyl. Significant correlations were obtained between the antioxidant activity and phenolic content (r = 0.887). All samples indicated proper maturity, considering the high soluble solids. The values for ash and electrical conductivity were high (0.24–0.60% and 878–1463 μS/cm, respectively). The concentration of 14 minerals of red pine honeys were determined by inductively coupled plasma-atomic emission spectrometry. All samples contained high amounts of potassium, calcium, phosphorus, sodium, iron, magnesium, aluminum, nickel, and zinc. Within the mineral contents, potassium was quantitatively the most important mineral, having an average content of 3,802 ppm, and accounted for 45% the minerals.

Antioxidant Capacity and Phenolic Profile of Berry, Seed and Skin of Ekşikara (Vitis vinifera L) grape: Influence of Harvest Year and Altitude

ABSTRACT Ekşikara (Vitis vinifera L.) is a poorly known native Turkish grape cultivar, which is being cultivated for thousands of years for table consumption, raisin, and grape molasses production. The aim of this study was to investigate the phenolic profile of whole berry, skin, and seeds of the cultivar and to determine the effect of harvesting year and altitude of the vineyard location. The grape samples were collected from two vineyards, located at 1000 and 1500 m of altitude in year 2014 while it was collected from 1500 m of altitude in year 2015. In addition to phenolic profile, antioxidant activity, total phenolic, anthocyanin, and tannin contents, and fatty acid profile of seed oil were also analyzed. In this study, anthocyanins, resveratrol, rutin, and isorhamnetin-3-glucoside were mainly found in skin while monomers and dimers of flavan-3-ols were present mainly in the seed. Altitude had a drastic effect on phenolic compounds as well as on the antioxidant activity of whole berry, skin, and seeds.

Alıç (Crataegus orientalis) meyvesinin antioksidan aktivitesi ve fenolik bileşiklerinin ekstraksiyonu üzerine farklı çözgenlerin etkisi

Bitkisel materyallerden biyoaktif bilesiklerin ekstraksiyonu besinsel destek uretimi ve endustriyel atiklardan bilesiklerin geri kazanimi gibi proseslerin en onemli asamalarindan biridir. Ekstraksiyon, solvent cesidi, partikul boyutu, ekstraksiyon suresi ve sicakligi gibi faktorlerden etkilenmektedir. Bu arastirmada farkli cozgenlerle ekstrakte edilen alic (Crataegus orientalis) meyvesinin toplam fenolik madde iceriginin, antioksidan aktivitesinin ve fenolik madde profilinin belirlenmesi ve en uygun cozgenin tespiti amaclanmistir. Beysehir’de dogal olarak yetisen agaclardan toplanan alic meyveleri su, metanol ve metanol:su (1:1) karisimi ile ekstrakte edilmistir. En yuksek antioksidan aktivite ve toplam fenolik icerigi metanol:su ekstraktinda elde edilmistir. Prosiyanidin B1 ve B2, (-)-epikatesin, epigallokatesin gallat ve rutin ekstraksiyonunda en iyi cozucunun metanol:su karisimi oldugu, gallik asidin suda daha iyi ekstrakte edildigi tespit edilmistir.