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Development of Poly(L-lactic acid) Films Containing Curcuma lunga L. Extract for Active Cheese Packaging
(MDPI AG, 2025)
Bužarovska, Aleksandra
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Trajkovska Petkoska, Anka
<jats:p>Biobased packaging solutions with active functions for different food categories are a very attractive topic nowadays. This packaging provides suitable preservation of the food quality and extends the shelf life of packed items. In addition, this is a promising pathway to overcome global pollution, to protect human health, as well as to provide a better planetary wellbeing. In this work, a packaging composition based on poly(lactic acid) (PLA) with the addition of Curcuma longa L. (C) extract prepared by the solution casting method is promoted as a potential packaging option for the active food packaging of cheese. The dopant levels of the extract were performed at 0.5%, 1%, 2%, 5%, and 10%, while the neat PLA film was used as a control. The obtained results are promising. By a thermal analysis, it is shown that C-extract has a plasticizing and nucleating effect on PLA molecules, as well as improving the barrier and other film properties. Moreover, this packaging was proven as a potential antimicrobial packaging for white cheese—it enables extending the shelf life by direct contact. This is a simple way of manufacturing biobased packaging doped with natural antimicrobials that could be used for other food categories that are prone to microbiological attack.</jats:p>
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Valorization of tomato processing by-products: Predictive modeling and optimization for ultrasound-assisted lycopene extraction
(Elsevier BV, 2024-11)
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Stojchevski, Martin
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Lycopene is a carotenoid highly valuable to the food, pharmaceutical, dye, and cosmetic industries, present in ripe tomatoes and other fruits with a distinctive red color. The main source of lycopene is tomato crops. This bioactive component can be successfully isolated from tomato processing waste, commonly called tomato pomace, mostly made from tomato skins, seeds, and some residual tomato tissue. The main investigative focus in this work was the application of green engineering principles in each stage of the optimized ultrasound-assisted extraction (UAE) of enzymatically treated tomato skins to obtain functional extracts rich in lycopene. The experimental plan was designed to determine the influence of studied operating parameters: enzymatic reaction time (60, 120, and 180 min), extraction time (0, 5, 10, 15, 30, 60, and 120 min), and temperature (25, 35 and 45 ℃) on lycopene yield. Process optimization was performed based on the yield of lycopene [1018, 1067, and 1120 mg/kg] achieved at optimal operating conditions. An artificial neural network (ANN) model was developed and trained for predictive modeling of the closed extraction system, with operating parameters used as input neurons and experimentally obtained values for lycopene content defined as the output neural layer. Applied ANN architecture provided a high correlation of experimental output with ANN-generated data (R=0.99914) with a model deviation error for the entire data set of RMSE=5.3 mg/kg. The k-Nearest Neighbor algorithm was introduced to predict lycopene yield using experimental key features: operating temperature, extraction time, and time of enzymatic treatment, split into training and testing sets with an 85/15 ratio. The model interpretation was conducted through the SHAP (SHapley Additive exPlanations) methodology.
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Inulinase immobilisation in PAA/PEG composite for efficient fructooligosaccharides production
(Informa UK Limited, 2022-12-26)
Temkov, Mishela
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Velickova, Elena
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Krastanov, Albert
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Prediction of the temperature sensitivity of strawberry drop damage using dynamic finite element method
(Elsevier BV, 2022-08)
An, Xue
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Liu, Huijie
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Fadiji, Tobi
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Li, Zhiguo
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Pre-fermentative Treatment of Grape Juice and Must from Vranec Variety with a Glucose Oxidase from Aspergillus niger
(Springer International Publishing, 2020-09-05)
Petkova, Verica
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Stafilov, Trajce
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Inulinase immobilisation in PAA/PEG composite for efficient fructooligosaccharides production
(Informa UK Limited, 2020-12-26)
Temkov, Mishela
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Velickova, Elena
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Krastanov, Albert
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Inulinase immobilisation in PAA/PEG composite for efficient fructooligosaccharides production
(Informa UK Limited, 2020-12-26)
Temkov, Mishela
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Velickova, Elena
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Krastanov, Albert
Inulinase was immobilised by entrapment method in polyacrylamide/polyethylene glycol composite and evaluated for its efficiency for short-chain fructooligosaccharides (3–6 degrees of polymerisation) production in batch hydrolysis system. Aqueous two-phase polymerisation technique was used to synthesise the composite, where aqueous polyethylene glycol 1000 containing the enzyme was used as dispersant with ammonium persulfate as initiator. The characteristics of free and immobilised inulinase were investigated and compared, and the results showed shift of pH and temperature optimum and change in stability caused by the immobilisation material. The immobilised preparation retained 50% of its initial activity after 20 successive batch cycles of 1 h each. The conversion degree of highly polymerised inulin to fructooligosaccharides (3–6 degrees of polymerisation) was 36% when using 30% PAA/PEG, w/v.

Faculty of Technology and Metallurgy

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