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    Chia Seed Mucilage Versus Guar Gum: Effects on Microstructural, Textural, and Antioxidative Properties of Set-Type Yoghurts
    (Inst Tecnologia Parana, 2020) Atik, Didem Sozeri; Demirci, Talha; Ozturk, Hale Inci; Demirc, Sumeyye; Sert, Durmus; Akin, Nihat
    Texture is an important parameter which influences on the quality and acceptability of yoghurts. The utilize of stabilizers in yoghurt manufacturing has become a prevalent application to improve the textural properties of yoghurts. In this context, guar gum obtained from Cyamopsis tetragonolobus is generally used as a natural stabilizer for its thickening and gelling properties. Accordingly, this study evaluated the use of chia seed mucilage as an alternative to guar gum to improve the textural properties of yoghurt. This study focused on the effect of using chia seed mucilage (CSM) and guar gum (GG) at 1, 2, and 3% concentrations on the textural and microstructural characteristics of yoghurts. The results of fortifications with CSM and GG on the physicochemical, sensory, and antioxidative properties of yoghurts were also evaluated. Compared to GG, CSM provided higher antioxidant activity which improved with increasing concentrations of CSM. An enhancement was observed in textural properties of yoghurts containing CSM and GG, but CSM concentrations up to 2% gave better effect on firmness. Besides, the microstructure of yoghurt was enhanced depending on the increase in CSM and GG amounts. No negative effect was determined on the sensory properties of the samples by CSM and GG additions. The results showed that CSM can be used in set-type yoghurt production as an alternative stabilizer by improving firmness and consistency and reducing syneresis. Furthermore, its use is suitable for industrial yoghurt production with regards to sensorial properties.
  • Küçük Resim Yok
    Öğe
    Chia Seed Mucilage Versus Guar Gum: Effects on Microstructural, Textural, and Antioxidative Properties of Set-Type Yoghurts
    (Inst Tecnologia Parana, 2020) Atik, Didem Sozeri; Demirci, Talha; Ozturk, Hale Inci; Demirc, Sumeyye; Sert, Durmus; Akin, Nihat
    Texture is an important parameter which influences on the quality and acceptability of yoghurts. The utilize of stabilizers in yoghurt manufacturing has become a prevalent application to improve the textural properties of yoghurts. In this context, guar gum obtained from Cyamopsis tetragonolobus is generally used as a natural stabilizer for its thickening and gelling properties. Accordingly, this study evaluated the use of chia seed mucilage as an alternative to guar gum to improve the textural properties of yoghurt. This study focused on the effect of using chia seed mucilage (CSM) and guar gum (GG) at 1, 2, and 3% concentrations on the textural and microstructural characteristics of yoghurts. The results of fortifications with CSM and GG on the physicochemical, sensory, and antioxidative properties of yoghurts were also evaluated. Compared to GG, CSM provided higher antioxidant activity which improved with increasing concentrations of CSM. An enhancement was observed in textural properties of yoghurts containing CSM and GG, but CSM concentrations up to 2% gave better effect on firmness. Besides, the microstructure of yoghurt was enhanced depending on the increase in CSM and GG amounts. No negative effect was determined on the sensory properties of the samples by CSM and GG additions. The results showed that CSM can be used in set-type yoghurt production as an alternative stabilizer by improving firmness and consistency and reducing syneresis. Furthermore, its use is suitable for industrial yoghurt production with regards to sensorial properties.
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    Influence of hot and cold break tomato powders on survival of probiotic L. paracasei subsp. paracasei F19, texture profile and antioxidative activity in set-type yoghurts
    (Elsevier, 2020) Demirci, Talha; Sert, Durmus; Aktas, Kubra; Atik, Didem Sozeri; Negis, Hale Inci Ozturk; Akin, Nihat
    The yoghurt samples enriched with hot and cold break tomato powders (HBT and CBT) were evaluated by monitoring the changes in some physicochemical properties and bacterial viability during storage. Besides, radical scavenging activity, total phenolic contents, and textural parameters of samples were determined. Tomato powders were added at different levels (0.5, 1, 2%) and L. paracasei F19 was used with starter culture in yoghurt production. Total solids and ash content of yoghurt without powders were lower than the others. HBT supplementation significantly increased DPPH and ABTS + scavenging activities and the highest activities were determined in yoghurt samples containing 2% HBT (197.7 g/kg, 4.84 mol trolox/kg respectively). Total phenolic content of samples ranged from 5.00 to 14.92 g GAE/kg. The addition of tomato powders decreased firmness and viscosity and plain yoghurt was found to be more consistence (12161.80 g s) and cohesive (219.50 g). The pH values of samples decreased whereas titratable acidity values increased throughout 21 days of storage and L. pantacasei F19 counts was higher than 10(6) CFU/g at the end of storage.
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    Particle morphology and antimicrobial properties of electrosprayed propolis
    (Elsevier, 2022) Atik, Didem Sozeri; Boluk, Esra; Bildik, Fatih; Altay, Filiz; Torlak, Emrah; Kaplan, Abdulkerim Ahmet; Kopuk, Berkay
    In this study, propolis resin was electrosprayed (ES) without a carrier polymer in order to produce nanoparticles, and the parameters affecting the ES process were investigated. During preliminary experiments, surface tension, electrical conductivity, dielectric, and rheological properties of the feed solution and their effects on electrospraying of propolis were determined. Afterward, the propolis solution was fed to the electrospinning equipment at the different feed rates (1, 5.5, and 10 ml/h), the voltages (5, 12.5, and 20 kV), and the distances to the collector plate (5, 10, and 15 cm). According to the response surface analysis (RSA), the feed rate and the applied voltage were effective for the morphology and diameter of particles. In contrast, the antimicrobial activity of particles against Staphylococcus aureus and Escherichia coli depended on the feed rate and the distance to the collector plate. Based on these results, the optimum feed rate, applied voltage, and distance to the collector plate conditions for ES of propolis were found as 8.82 ml/h, 20 kV, and 5 cm, respectively.