Yazar "Saracoglu, Onur" seçeneğine göre listele

Listeleniyor 1 - 5 / 5
  • Küçük Resim
    Öğe
    ANTIOXIDANT, PHYSICAL AND CHEMICAL CHARACTERISTICS OF CORNELIAN CHERRY FRUITS (Cornus mas L.) AT DIFFERENT STAGES OF RIPENESS
    (Wydawnictwo Akad Rolniczej W Lublinie, 2013) Gunduz, Kazim; Saracoglu, Onur; Ozgen, Mustafa; Serce, Sedat
    There has been growing interest for less utilized fruit species lately. Cornelian cherry is one of these species with significant antioxidant characteristics. In this study, several, chemical properties and antioxidant characteristics of cornelian cherry fruits at four ripeness stages were evaluated. The stages were light yellow, blush, light red and dark red. Several fruit characteristics (fruit width, length, weight), total soluble solids (TSS), total titratable acidity (TA), sugar/acid ratio (TSS/TA), pH, fruit external color, total phenolic compounds (TPC), total antioxidant capacity (AOC) by trolox equivalent antioxidant capacity (TEAC), total monomeric anthocyanins (TMA) and tannins were evaluated. The stages were found to be significantly different for all factors evaluated. There was an overall increase in fruit width, length, weight, TSS, and SSC/TA over time, while TA averages decreased as the fruit matured. Fruit color progressively turned to dark red as anthocyanin accumulates. TPC and TEAC averages were similar at light yellow (8033 mu g gallic acid equivalent GAE . g(-1) fresh weight (fw) and 55.0 mu mol trolox equivalent (TE) . g(-1) fw) and reduced at the dark red stages (4162 mu g GAE . g(-1) fw and 7.8 mu mol TE . g(-1) fw). Tannin content decreased from 0.45 to 0.19% from light yellow to dark red stages.
  • Küçük Resim
    Öğe
    Antioxidant, physical and chemical characteristics of cornelian cherry fruits (Cornus mas L.) at different stages of ripeness
    (2013) Gunduz, Kazim; Saracoglu, Onur; Özgen, Mustafa; Serce, Sedat
    There has been growing interest for less utilized fruit species lately. Cornelian cherry is one of these species with significant antioxidant characteristics. In this study, several chemical properties and antioxidant characteristics of cornelian cherry fruits at four ripeness stages were evaluated. The stages were light yellow, blush, light red and dark red. Several fruit characteristics (fruit width, length, weight), total soluble solids (TSS), total titratable acidity (TA), sugar/acid ratio (TSS/TA), pH, fruit external color, total phenolic compounds (TPC), total antioxidant capacity (AOC) by trolox equivalent antioxidant capacity (TEAC), total monomeric anthocyanins (TMA) and tannins were evaluated. The stages were found to be significantly different for all factors evaluated. There was an overall increase in fruit width, length, weight, TSS, and SSC/TA over time, while TA averages decreased as the fruit matured. Fruit color progressively turned to dark red as anthocyanin accumulates. TPC and TEAC averages were similar at light yellow (8033 ?g gallic acid equivalent GAE · g-1 fresh weight (fw) and 55.0 ?mol trolox equivalent (TE) · g-1 fw) and reduced at the dark red stages (4162 ?g GAE · g-1 fw and 7.8 ?mol TE · g-1 fw). Tannin content decreased from 0.45 to 0.19% from light yellow to dark red stages.
  • [ N/A ]
    Öğe
    CHANGES IN CHEMICAL COMPOSITION, TOTAL PHENOLIC CONTENT AND ANTIOXIDANT ACTIVITIES OF JUJUBE (Ziziphus jujuba Mill.) FRUITS AT DIFFERENT MATURATION STAGES
    (Wydawnictwo Akad Rolniczej W Lublinie, 2014) Gunduz, Kazim; Saracoglu, Onur
    Jujube (Ziziphus jujuba Mill.) fruit is an important medicinal plant in Turkey. Several characteristics of jujube fruit harvested at four maturation stages were evaluated. The maturation stages were classified by degree (%) of dark color formation on the fruit surface [Stage (S1), '1-10% (S2), 11-50% (S3), 51-100% (S4)]. Fruit weight, width, length, stone weight, flesh/stone ratio, total soluble solids (TSS), titratable acidity (TA), organic acids and specific sugars were determined. Total phenolic content (TPC) was measured along with antioxidant activity (AOC), determined by Ferric Reducing Ability of Plasma (FRAP) and Trolox Equivalent Antioxidant Capacity (TEAC). Results of the study showed that TSS increased from 12.8% to 18.3% from the S1 to the S4 fruit stage, respectively. The S3 had the highest TPC (6518 mg GAE. kg fw). The highest AOC were recovered from S2 (TEAC; 74.4 Amol TE. g fw, FRAP; 50.9 piano' TE. g fw), followed by S3 (TEAC; 63.6 Amol TE.g fw, FRAP; 37.6 Amol TE-g fw). The main organic acid was citric acid as determined by the HPLC method. Fructose content tended to be more stable than glucose or sucrose.
  • Küçük Resim
    Öğe
    Determining total phenolic content and total antioxidant capacity of loquat cultivars grown in Hatay
    (Wolters Kluwer Medknow Publications, 2010) Polat, A. Aytekin; Caliskan, Oguzhan; Serce, Sedat; Saracoglu, Onur; Kaya, Cemal; Ozgen, Mustafa
    Several fruit characteristics of five loquat (Eriobotrya japonica (Thunb.) Lindl.) cultivars/selections grown in Dortyol, Hatay, Turkey were investigated in 2008. The cultivars/selections included 'Baduna 5', Guzelyurt 1, 'Hafif Cukurgobek', 'Ottaviani,' and Type 1. The characteristics evaluated included fruit weight, width, length, seed number and weight, flesh/seed ratio, total soluble solids (TSS), pH, acidity, total phenolic (TP) content, and total antioxidant capacity (TAC), determined by the ferric reducing antioxidant power ( FRAP) assay. The analyses were conducted by three replicates, with 30 fruits in each replicate. The results indicated that there were significant differences among the cultivars, for all the traits tested. For example, 'Hafif Cukurgobek' and 'Ottaviani' had smaller fruits than others, although 'Hafif Cukurgobek' had heavier seeds. The flesh/seed ratio was the highest in Type 1, while 'Hafif Cukurgobek' had the highest pH and high soluble solids. 'Baduna 5' and 'Hafif Cukurgobek' had the highest acidity. The TP ranged from 129 ('Baduna 5') to 578 ('Hafif Cukurgobek') mg gallic acid equivalent (GAE)/kg fresh fruit (fw). 'Hafif Cukurgobek' also had the highest FRAP mean (12.1 mmol Trolox Equivalent (TE)/kg fw). The results suggest that loquat cultivars have a variable range of TP content and a relatively high total antioxidant capacity, which is crucial for human health.
  • Küçük Resim
    Öğe
    Variation in total phenolic content and antioxidant activity of Prunus cerasifera Ehrh. selections from Mediterranean region of Turkey
    (Elsevier, 2012) Gunduz, Kazim; Saracoglu, Onur
    Several fruit characteristics were determined along with the total phenolic content (TP) and total antioxidant capacities (TAC) of eighteen Prunus cerasifera accessions previously selected from the Mediterranean region of Turkey and grown in Mut, Mersin, Turkey. Five cultivars ('Can2', 'Cin', 'Havran', 'Ozark Premier' and 'Papaz') from the same orchard were also included in this study. TP and TAC were determined by ferric reducing ability (FRAP) and trolox-equivalent antioxidant capacity (TEAC) assays. The accessions were found to be significantly different for all the characters tested. TP ranged between 136.8 ('Ozark Premier') and 583.1 (Selection No. 3) Gallic acid equivalent (GAE)/kg fresh weight (fw) while FRAP and TEAC measurements of TAC ranged between 0.123 (Selection 33C 02) and 0.127 (Selection 31C 18) to 0.835 ('Can 2') and 0.420 (Selection No. 8) mmol TE/kg fw. The correlation analysis indicated that TP was significantly correlated with L and hue values of color measurements. While FRAP was found to be correlated with pH, no significant correlation was detected with TEAC. A notable variation among the green-fleshed P. cerasifera accessions was reported for TP and TAC and, P. cerasifera had comparable TP to other plum species while it did not have a good antioxidant activity. (C) 2011 Elsevier B.V. All rights reserved.