Physicochemical and Mechanical Properties of Sodium Alginate Films Containing Thyme Essential Oil

Year 2024, Volume: 29 Issue: 2, 589 - 600, 31.08.2024

Cansu Torol , Özgül Özdestan Ocak

https://doi.org/10.53433/yyufbed.1439609

Abstract

In this study, it was aimed to develop edible film by the casting technique from sodium alginate (SA) (%2 w/v) using three different concentrations of thyme essential oil (TEO) (0.5%, 1%, 1.5% v/v). The physicochemical, mechanical, structural, and antioxidant properties of enriched SA films were also characterized. The highest film solubility (FS) was found as 91.78% in SA (control) films. The mechanical properties of films were found between 27.14 MPa and 50.06 MPa for tensile strength (TS) and between 13.88% and 32.02% for elongation at break (EAB). The highest total phenolic content (TPC) and antioxidant activity were found as 382.19 mg GAE/kg and 16.20% in SA film incorporated with TEO 1.5% respectively. As the concentration of TEO increased, the L* value increased, leading the film colors to approach white. Additionally, it was observed that as the b* value increased the film colors tented towards yellow. When the results of SEM analysis were evaluated, it was found that SA films were more homogeneous than other films. In general, it was concluded that TEO at a concentration of %1 (v/v) improves the physical and chemical properties of sodium alginate film compared to other groups.

Keywords

Edible film, Film characterization, Sodium alginate, Thyme essential oil

Supporting Institution

Ege University Scientific Research Projects Coordination Unit

Project Number

FYL 2020 22112

Thanks

This work was supported by Ege University Scientific Research Projects Coordination Unit (Project number FYL 2020 22112).

Kekik Esansiyel Yağı İçeren Sodyum Aljinat Filmlerinin Fizikokimyasal ve Mekanik Özellikleri

Abstract

Bu çalışmada dökme yöntemikullanılarak üç farklı konsantrasyonda kekik esansiyel yağı (KY) (%0.5, %1, %1.5 h/h) katkılı sodyum aljinat (%2 a/h) (SA) filmlerin yenilebilir film olarak geliştirilmesi amaçlanmıştır. Zenginleştirilmiş sodyum aljinat filmlerin fizikokimyasal, mekaniksel, yapısal ve antioksidan özellikleri karakterize edilmiştir. En yüksek film çözünürlüğü %91.78 olarak SA (kontrol) filmlerde bulunmuştur. Filmlerin kopma mukavemeti 27.14 MPa ve 50.06 MPa arasında, kopma anında uzama değerleri ise 13.88% ve 32.02% arasında bulunmuştur. En yüksek toplam fenolik içerik ve antioksidan aktivite sırasıyla %1.5 KY içeren SA filminde 382.19 mg GAE/kg ve %16.20 olarak bulunmuştur. KY’nin artan konsantrasyonlarına bağlı olarak L* değeri arttı ve film renkleri beyaza yaklaştı. Ayrıca b* değerinin artması ile film renkleri sarıya yaklaştığı görülmüştür.SEM analiz sonuçları değerlendirildiğinde SA filmlerin diğer filmlere göre daha homojen olduğu tespit edilmiştir. Genel olarak %1 (h/h) konsantrasyonunda KY’nin sodyum aljinat filminin fiziksel ve kimyasal özelliklerini diğer gruplara kıyasla daha iyi geliştirdiği sonucuna varılmıştır.

Keywords

Film karakterizasyonu, Kekik esansiyel yağı, Sodyum aljinat, Yenilebilir film

Project Number

FYL 2020 22112

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