WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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

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Author: search.filters.author.Korel, FigenHas files: No

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  • Article
    Citation - WoS: 1
    Citation - Scopus: 1
    Innovative Active and Intelligent Packaging Film Based on Pectin/Gelatin Biocomposites With Zein Nanoparticles and Anthocyanin: Quality Monitoring in Mandarin and Cucumber
    (Elsevier, 2025) Takma, Dilara Konuk; Bozkurt, Semra; Koc, Mehmet; Korel, Figen; Nadeem, Hilal Sahin
    With increasing demand for active and intelligent packaging to extend the shelf life of fresh produce and monitor its freshness, this study focused on developing a nanocomposite film. The film incorporates anthocyanin and bioactive chestnut shell extract-loaded zein nanoparticles, and its applications as coatings and packaging material for mandarin and cucumber fruits were investigated. Extracts derived from waste materials including chestnut shell, cedar tree bark and sweetgum (styrax liquidus) shell, chestnut shell extract-loaded active and intelligent nanocomposite films exhibited excellent properties, including low water vapor permeability (0.325 +/- 0.055 g.mm/m(2).h.kPa), high total phenolic content (77.20 +/- 5.64 mg GAE/g dry matter), and strong antioxidant capacity (220.04 +/- 2.70 mg Trolox equivalent /100 g dry weight). The film demonstrated sufficient tensile strength (29.35 +/- 3.40 MPa) and elongation at break (100.86 +/- 2.25 %) for its conversion into a practical packaging material. To evaluate its effectiveness, coating and packaging applications were carried out on mandarin and cucumber fruits, serving as non-climacteric model fresh produce. Coating and packaging significantly (p < 0.05) inhibited the growth of total aerobic mesophilic bacteria and yeast and mold in mandarins, though the effect on yeast and mold in cucumbers was limited. At the end of storage, packaged mandarin and cucumber fruits exhibited the highest total phenolic content, measuring 423.77 +/- 17.68 and 96.47 +/- 10.52 mg GAE/100 g dry matter, respectively. Coated fruits demonstrated significantly (p < 0.05) higher total phenolic content (382.57 +/- 18.32 mg GAE/100 g dry matter for mandarin and 91.52 +/- 7.63 mg GAE/100 g dry matter for cucumber) compared to control samples (281.22 +/- 10.49 mg GAE/100 g dry matter for mandarin and 69.56 +/- 8.99 mg GAE/100 g dry matter for cucumber). Color and textural properties of mandarin fruit were effectively maintained through coating and packaging. However, cucumber fruits, due to their high respiration rate and thin peel structure, did not show the same extent of improvements. The anthocyanin indicator in intelligent packaging exhibited more visible and effective color changes in cucumbers compared to mandarin fruits.
  • Article
    Citation - WoS: 4
    Citation - Scopus: 3
    Enhancement of Post-Harvest Quality of Fresh Mandarins With Alginate-Based Edible Coating Containing Natamycin and Vanillin
    (Springer, 2024) Takma, Dilara Konuk; Korel, Figen
    Environmentally friendly technologies with regard to reducing the usage of commercial synthetic waxes are required for maintaining the quality of mandarin fruits during the post-harvest period. In this study, novel biocoatings that serve as a natural alternative to synthetic waxes were developed for obtaining sustained shelf life of freshly harvested mandarins. The effect of natamycin and vanillin as natural antimicrobial compounds on the post-harvest quality of mandarins were investigated by means of alginate-based edible coating. Alginate coating (1% w/v) formulations including 0.5% vanillin, 1.0% vanillin, 0.025% natamycin, 0.05% natamycin and without vanillin or natamycin were applied and compared with uncoated fruit as control. Weight loss, color change, fruit firmness, yeast and mold counts were examined over 21 days at 25 degrees C. Quality changes in mandarins such as losses of weight, color and softening changes were significantly delayed with alginate coatings. Brightness on the surfaces of fruits was improved by alginate coating layers. Fruit firmness decreased with storage time in control samples, while the firmness in coated samples remained relatively constant or increased. Moreover, yeast and mold counts considerably decreased (1.52 log cfu/g) for fruits coated with alginate coating incorporating 1% vanillin. Extension of the post-harvest storage of mandarin fruits could be performed by using alginate coating incorporating vanillin as an alternative to synthetic waxes.
  • 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.