FABRICATION AND CHARACTERIZATION OF GELATIN BASED ACTIVE NANOFIBERS BY CENTRIFUGAL SPINNING

Date

2024-9-4

Author

Güler, Güneş Su

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Centrifugal spinning is a novel method to produce fibers in a fast and efficient way to be used in active packaging. The objective of this study was to explore the impact of varying concentrations of caffeic acid and bay laurel leaf essential oil (BLLEO) on the characteristics of gelatin-based active fibers produced through centrifugal spinning. For BLLEO added samples, it was also aimed to optimize flow rate and fiber composition based on fiber diameter, antioxidant activity (AOA) and total phenolic content (TPC). In this aspect, different flow rates of solution (10, 15, 20 mL/h), concentrations of gelatin (20%, 25%) and concentrations of BLLEO (1%, 3%, 5%) were studied. Active gelatin fibers with different concentrations (control (0%), 2% and 3%) of caffeic acid and 1%, 3%, 5% of BLLEO were analyzed in terms of morphology, water vapor permeability (WVP), TPC, AOA, encapsulation efficiency (EE), Fourier Transform Infrared Spectroscopy (FTIR) and thermal analysis. Antimicrobial activity of fibers was also examined with two bacteria: E. coli and S. aureus. Morphological analysis showed that the addition of caffeic acid and BLLEO did not disrupt the homogenous structure of fibers. The AOA and TPC of fibers increased with the increase in active agent concentration. The application of both caffeic acid and BLLEO loaded fibers to olive oil during accelerated storage resulted in a notable reduction in total oxidation. In terms of TOTOX values, as compared to control sample, 3% caffeic acid added fibers 45% reduction, whereas 5% BLLEO added fibers had a reduction of 38%. Consequently, caffeic acid and BLLEO incorporated gelatin-based centrifugally spun fibers might be a promising active packaging material due to their antioxidant or antimicrobial activities.

Subject Keywords

Centrifugal Spinning, Gelatin, Caffeic Acid, Bay Laurel Leaf Essential Oil, Antioxidant Activity

URI

https://hdl.handle.net/11511/111035

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Graduate School of Natural and Applied Sciences, Thesis