Food Engineering / Gıda Mühendisliği
Permanent URI for this collectionhttps://hdl.handle.net/11147/12
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Article Citation - WoS: 21Citation - Scopus: 22Characterization and Encapsulation Efficiency of Zein Nanoparticles Loaded With Chestnut Fruit Shell, Cedar and Sweetgum Bark Extracts(Elsevier, 2023) Konuk Takma, Dilara; Bozkurt, Semra; Koç, Mehmet; Korel, Figen; Şahin Nadeem, HilalZein nanoparticles (ZNPs) loaded with bioactive extracts of chestnut (Castanea sativa Mill.) shell, cedar (Cedrus libani) and sweetgum (Liquidambar orientalis) bark wastes were produced using different methods. Nanoprecipitation, high-speed homogenization and ultrasonic homogenization allowed the fabrication of ZNPs with particle sizes smaller than 202.40 nm, 430.25 nm and 325.50 nm, respectively. The smallest nanoparticle size was achieved at 132.81 nm for sweetgum bark extract-loaded ZNPs obtained by the nanoprecipitation method. Encapsulation efficiency (EE) was between 34.03 and 96.83% for all zein nanoparticles fabricated under different mixtures and process conditions. Zein concentration and extract ratio played an essential role in the EE of nanoparticles. The best conditions were determined to obtain the desired properties of ZNPs based on particle size, polydispersity index and EE by using a central composite rotatable design. The nanoprecipitation method was more appropriate for producing chestnut and cedar shell/bark extract-loaded nanoparticles. In contrast, the high-speed homogenization method was suitable for producing sweetgum bark extract-loaded nanoparticles. As a result of the encapsulation of various shell/bark extracts within zein nanoparticles, value-added products were generated from wastes having bioactive compounds. The developed zein nanoparticles for each extract type would offer eco-friendly, simple and safe food processing and packaging systems. © 2023Article Citation - WoS: 151Citation - Scopus: 179Active Packaging Films as a Carrier of Black Cumin Essential Oil: Development and Effect on Quality and Shelf-Life of Chicken Breast Meat(Elsevier Ltd., 2019) Konuk Takma, Dilara; Korel, FigenFabrication of active PET films assembled with antimicrobial chitosan and alginate coatings incorporating black cumin oil(BCO) was performed by layer-by-layer(LbL) technique and effect of active packaging film on quality and shelf-life of chicken breast meats stored at 4 degrees C for 5 days was investigated. Multilayer films were characterized in terms of surface morphology, color, thickness, and antimicrobial activity. Incorporation of BCO into film demonstrated antimicrobial activity against Staphylococcus aureus and Escherichia coll., and spherical particles on surface profile. Changes in weight loss, color, pH, total aerobic mesophilic(TAMC), and psychrotrophic bacteria counts(PBC) of chicken meat, packaged in trays containing antimicrobial films, were observed. Increase in pH values was higher in control samples than samples packaged with antimicrobial film during storage. Samples stored in active packaging had slightly lower TAMC and PBC compared to control samples. Results indicated that active film containing BCO has the potential to maintain safety and quality of chicken meat.Article Effect of Storage Temperature and Packaging Material on the Shelf-Life of Newly-Developed No-Added Sugar Almond Paste(Consulting and Training Center - KEY, 2018) Konuk Takma, Dilara; Korel, Figen; Avcı, Başak; Edeer, ÖzgürAlmond paste is a traditional dessert made from sweet almonds which are rich in: omega-6 fatty acids, sugar, and water. Development of no added sugar, low calorie, protein and high fiber source almond paste can be preferred by diabetics and calorie conscious people as a healthy snack. The objectives of this study were to determine the best formulation of no added sugar almond paste by sensory evaluation and investigate the effect of storage temperature and packaging material on shelf-life of newly-developed almond paste. Three different formulated almond pastes were provided by Egepak Company and sensory analysis was performed by using 5-point hedonic scale and ranking tests. Sensory properties including: appearance, taste, sweetness, texture, overall acceptability and ranking were evaluated statistically by using ANOVA. Almond pastes were stored both in small glass jars (GJ) and polyethylene packaging bags (PPB) at 4°C and 21°C. During 56 days of storage, total aerobic mesophil-ic bacteria (TAMB), yeast-mold and coliform counts were determined using: 3M PetrifilmTM aerobic count plates, potato dextrose agar (PDA) and violet red bile agar (VRBA) incubated at 35°C/48h, 25°C/5days and 35°C/24h, respectively. The most desired formulation was determined based on the highest sensory scores: 4.2, 4.2, 3.8, 4.0 for appearance, taste, sweetness, texture, respectively. Microbial counts on TAMB ranged from 3.30 to 3.66 log cfu/g at the end of storage with the most pronounced effect being achieved by PPB at 4°C. No fungal growth was observed during storage on almond paste stored in GJ at 4°C and 21°C. Significant increase occurred in coliform counts at 4°C and 21°C and no advantage was found in samples stored in GJ compared to that in PPB. The combination of 4°C storage temperature and GJ and PPB packaging materials provided the best shelf-life for newly-developed no-added sugar almond paste. © 2019, Consulting and Training Center - KEY. All rights reserved.Article Citation - WoS: 44Citation - Scopus: 53Impact of Preharvest and Postharvest Alginate Treatments Enriched With Vanillin on Postharvest Decay, Biochemical Properties, Quality and Sensory Attributes of Table Grapes(Elsevier Ltd., 2017) Konuk Takma, Dilara; Korel, FigenAlginate solution enriched with vanillin as a bioactive compound was investigated for improving preharvest and postharvest quality and safety of table grapes. Alginate treatments with or without vanillin as preharvest spray and postharvest coating were implemented on table grapes of Alphonse Lavalleé and Razaki cultivars. Fungal decay, biochemical properties, quality and sensory attributes were evaluated at day of preharvest treatment, at harvesting and during 35 days of storage at 4 ± 2 °C. Alginate treatments with or without vanillin were effective in preventing weight and firmness losses. Total soluble solids, titratable acidity, and color of grapes coated with alginate coatings with or without vanillin showed minor changes compared to control grapes. Alginate coating incorporating vanillin provided significant reduction (1.73 log CFU/g) in yeast-mold growth. Moreover, the coatings maintained greater total phenolic content and antioxidant activity compared to others during postharvest storage. In terms of sensory attributes, appearance was ranked as the highest for alginate coating without vanillin due to glossiness of alginate.