Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 1Citation - Scopus: 1Innovative 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 SahinWith 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: 34Citation - Scopus: 36Effects of Organo-Modified Clay Addition and Temperature on the Water Vapor Barrier Properties of Polyhydroxy Butyrate Homo and Copolymer Nanocomposite Films for Packaging Applications(Springer Verlag, 2018) Akın, Okan; Tıhmınlıoğlu, FundaPolymer nanocomposites, based on bacterial biodegradable thermoplastic polyester, poly(hydroxy-butyrate) (PHB), poly(hydroxyl-butyrate-co-hydroxy-valerate) (PHBHV), and commercial organo-modified montmorillonite (OMMT-Cloisite 10A) were prepared by solution casting method. This work aims to investigate the effect of Cloisite 10A type clay addition on the water vapour permeability properties of PHB/OMMT, and PHBHV/OMMT nanobiocomposite films. Temperature dependence of water vapor permeabilities of the films were also evaluated at various temperatures, and semi empirical permeability models were used to predict the permeability of polymer systems as a function of clay concentration and aspect ratio of nanoplates. Moreover, thermal, optical, and mechanical properties of the composites were examined by using varieties of techniques including differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA), scanning electron microscope (SEM), and thin-film X-ray diffractometer (TF-XRD) respectively. Test results indicated that addition of highly intergallery swollen Cloisite 10A to the PHB/PHBHV, reduced the water vapor permeability up to 41 and 25% compared to native PHB and PHBHV films, respectively. Regarding the all mechanical properties measured, the maximum improvement was achieved for 3 wt% clay loaded samples for both PHB and PHBHV polymer composites. An increase of about 152 and 73% in tensile strength and of 77 and 18% in strain at break was achieved for PHB and PHBHV polymers, respectively. As a result of X-ray diffraction analysis, exfoliated structure was achieved at low clay loaded sample (1% w/w), however at higher concentration (3% w/w) the structure found as intercalated. Therefore, it is an evident that enhancement of characteristic properties highly depend on the dispersion level of clay particles in polymer matrix. The results obtained in this study show the feasibility of improvement of the properties of PHB based polymers with incorporation of nanoclay.