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: 1Fabrication of Electrospun Polycaprolactone Nanofibrous Mats Loaded With Purple Basil Extract (Ocimum Basilicum L.) as Colorimetric Ph Indicator Films(Springer, 2025) Erez, Elif; Eroglu, Ahmet Emin; Bayramoglu, BesteIntelligent packaging with colorimetric pH indicators revolutionizes traditional food packaging by enabling real-time food quality monitoring. This study used electrospinning to develop pH indicator films from polycaprolactone (PCL) incorporating purple basil extract (PBE). Nanofibrous films containing 0.2% PBE (PCLN_0.2PBE), 0.4% PBE (PCLN_0.4PBE), and 0.6% PBE (PCLN_0.6PBE) were fabricated using different electrospinning conditions. The PCLNs fabricated with a voltage of 20 kV and a flow rate of 1.6 mL/h exhibited the most uniform and bead-free morphology according to scanning electron microscopy. The chemical, thermal, mechanical, and wetting characterization of the films was performed by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermal gravimetric analysis, texture analysis, and contact angle analysis, respectively. Both PCLN_0.4PBE and PCLN_0.6PBE films displayed fast (4-5 s) and clear color transitions (Delta E > 3.5) to successive pH buffers within the range critical for food deterioration, while they exhibited excellent color changes (Delta E > 5) for pH variations of at least two units. The PCLN_0.6 PBE film displayed a Delta E of similar to 5 in only 5 min of exposure to ammonia vapor, whereas PCLN_0.4PBE showed a similar color change for over 15 min. The interaction between the films and acidic and alkaline semi-solid foods was simulated using gelatin gels at pH 2.5 and 11, respectively. Both films displayed significant color transitions (Delta E > similar to 9) within 15 min of contact with the gels, with the response from PCLN_0.6 PBE being more pronounced. The color stability in both films was maintained for up to 14 days at 4 degrees C, offering potential early warnings against food spoilage. PBE release was evaluated against different food simulants. The highest release occurred in 50% ethanol; the films demonstrated resistance to 3% acetic acid. The findings indicate that electrospun PCL films integrated with PBE have a promising potential to serve as colorimetric pH indicators for monitoring the freshness of food products.Article Citation - WoS: 1Citation - Scopus: 1Investigating the Behavior of D-Glucose, D-Fructose, and D-Allulose in Aqueous Media by Molecular Dynamics Simulations(Elsevier Sci Ltd, 2025) Bugday, Zinnur Yagmur; Bayramoglu, Beste; Oztop, Halil MecitIsomeric monosaccharides may have different hydration behaviors, leading to distinct physicochemical properties in solutions. In this work, the aqueous behavior, structure, and hydration properties of D-allulose, Dglucose, and D-fructose were investigated as a function of concentration by molecular dynamics simulations. This is the first computational study investigating D-allulose compared to its two isomers. The dynamics were analyzed through self-diffusion coefficients; hydration was characterized by hydrogen bond (HB) analyses. Radial distribution functions were used to probe water structuring around sugar oxygens. Results show the hydration number and the fraction of bound water in solution were the highest for glucose, followed by fructose and allulose. The C3 epimerization of fructose into allulose highly promotes the allulose pyranoses to form intramolecular HBs, significantly limiting their water-holding capacity. This may possibly explain the favorability of furanose forms over pyranose forms in aqueous allulose solutions, opposing glucose and fructose in solution.Article Citation - WoS: 6Citation - Scopus: 6Evaluation of the Extracts of Purple Basil (<i>ocimum Basilicum</I> L.) as Natural Ph-Indicator Dyes Anticipated To Be Utilised in Intelligent Food Packaging-An Optimisation Study(Wiley, 2024) Erez, Elif; Bayramoğlu, Beste; Bayramoglu, BestePurple basil (Ocimum basilicum L.) extract has significant potential as a natural colorimetric pH-indicator material owing to its abundance in anthocyanins. This contribution is the first to optimise the ultrasound-assisted extraction of purple basil by response surface methodology in terms of maximum total monomeric anthocyanin (TMA) content and pH-dependent increase in green intensity (IGI) using a three-level, three-factor Box-Behnken design. The latter was considered as a measure of the pH-indicator ability of the extracts. The independent variables were ethanol concentration, solvent/solid ratio, and extraction time for two types of solvents [aqueous ethanol with 0.1% (v/v) acetic acid (Ac) or hydrochloric acid]. Optimum conditions were determined for single and combined responses. The extracts were further characterised according to total phenolic content (TPC), percentage polymeric colour (PPC), 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) antioxidant, and 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activities. All models explained more than 93% of the variability. The combined response model for the Ac-acidified system gave more favourable optimal conditions [55.25% (v/v) ethanol, 30 mL/g solvent/solid ratio and 39.24 min] regarding lower ethanol consumption and shorter times. Validation experiments verified the model successfully predicted the responses. The corresponding TMA, IGI, PPC, TPC, ABTS, and DPPH values were determined as 4.83 +/- 0.18 mg cyanidin-3-glucoside equivalent, 2.29 +/- 0.05, 68.07 +/- 3.17, 28.79 +/- 1.54 mg gallic acid equivalent, 55.85 +/- 1.71 mg Trolox equivalent, and 16.80 +/- 1.08 mg ascorbic acid equivalent per gram dry weight, respectively.