WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7150

Browse

Filters

20153

Settings

Department: search.filters.department.İzmir Institute of Technology. Food EngineeringLanguage: search.filters.language.tr

Search Results

Now showing 1 - 3 of 3
  • Article
    Citation - WoS: 7
    Influence of Drying Temperature on Total Phenolic Content and Antioxidant Capacity of Grape Seeds
    (Pamukkale Üniversitesi, 2015) Konuk, Dilara; Korel, Figen
    Grape seed, which is an organic waste arise from production of wine, juice and molasses, is considered as a functional food ingredient in food formulations because of its rich content of bioactive compounds. This study was performed in order to evaluate the effect of air-drying temperature on the bioactive compounds of grape seeds. In the study, total phenolic content and antioxidant activity of grape seeds that are dehydrated at different drying temperatures (40, 50 and 60 degrees C) were determined. When comparing the fresh grape seeds with the corresponding dehydrated samples, it was shown that the drying operation led to reduction of total phenolic contents and the total phenolic contents decreased with an increase of the drying temperature. According to ABTS radical scavenging method, Trolox Equivalent Antioxidant Capacity (TEAC) was found to be highest for fresh grape seeds and presented lower values for grape seeds dried at three different temperatures. As a result of the study, it was demonstrated that grape seed is a powerful antioxidant source and it has still high antioxidant activity after drying process. However, drying at low temperatures was put forward to be advantageous in order to reduce the losses of phenolic components.
  • Article
    Citation - WoS: 1
    Assessment of Black Fig Varieties as Dried
    (Pamukkale Üniversitesi, 2015) Konak, Ramazan; Koşoğlu, İlknur; Tan, Nilgün; Kocataş, Hilmi; Yemenicioğlu, Ahmet
    Fig fruits contain high dietary fiber, phenolic compounds and minerals. Although there are many black figs varieties in Turkey, studies related to drying of colored figs scarce. In this study, 9 black colored figs varieties and standard fig varieties (Sarilop and Sarizeybek) from Fig Research Institute were dried, and quality parameters of dried fruits were investigated. The drying was conducted on trays by classical sun-drying. The results of this work clearly showed the suitability of black colored varieties with code number 1101, 1102 and 1012 for sun-drying.
  • Article
    Citation - WoS: 1
    Orta Nemli İncirlerde Depolama Sonrasında Pektin Metil Esteraz Aktivitesi Değişimi
    (Pamukkale Üniversitesi, 2015) Demirbüker Kavak, Dilek; Yemenicioğlu, Ahmet
    Orta nemli meyveler, kurutulmuş meyvelerin rehidre edilmesiyle elde edilebilmektedirler. Kuru meyvelere kıyasla doğrudan tüketime daha uygun olan orta nemli meyveler, sanayide unlu mamüller, süt ürünleri, şekerlemeler kullanılabilmektedirler. Bu çalışmanın amacı orta nemli hale getirilmiş incirlerin 3 aylık depolama süresi sonucunda mikrobiyal stabilitelerinin ve dokuda yumuşamaya neden olan pektin metil esteraz enzimi (PME) aktivitelerinin kıyaslanmasıdır. Bu amaçla kuru incirler 30°C ve 80°C'de suyla %30 nem içeriğine ulaşana kadar rehidre edilmişlerdir. Rehidre edilmiş örnekler, 3 ay süreyle +4°C'de depolanmışlardır. Depolama süresi sonunda toplam canlı sayımı sonuçlarına göre 30°C kontrol örnekleri ile 80°C'de rehidre edilmiş örnekler arasında istatistiksel olarak anlamlı bir fark bulunmamıştır. Depolama süresi sonucunda PME aktivitesi, kontrol örnekleri için 24.1 ?mol COOH dk-1g-1 iken, 80°C'de rehidre edilmiş orta nemli incirlerde 17.4 ?mol COOH dk-1g-1bulunmuştur. Sonuç olarak incirleri orta nemli hale getirmek için 80°C'de gerçekleşen rehidrasyon işlemi, depolama sonrası mikrobiyal yükü belirgin şekilde etkilememesine karşın, yumuşamaya neden olan PME aktivitesini 30°C'de rehidre edilmiş kontrol örneklerine kıyasla %28 oranında azaltmaktadır.