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2017, vol. 54, iss. 1, pp. 19-24
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Influence of different concentrations of glycerol and guar xanthan on properties of pumpkin oil cake-zein bi-layer film
Uticaj različite koncentracije glicerola i guar-ksantana na osobine dvoslojnog filma na bazi pogače uljane tikve golice i kukuruznog zeina
Project: Novel encapsulation and enzyme technologies for designing of new biocatalysts and biologically active compounds targeting enhancement of food quality, safety and competitiveness (MESTD - 46010)
Abstract
The objective of this study was to examine influence of glycerol and guar-xanthan in different concentrations on bi-layer film based on pumpkin oil cake (PuOC) and corn zein, and to find optimal concentrations of these additives which result in film with optimal mechanical and barrier characteristics. Different concentrations of glycerol (30%, 40%, and 50%) as plasticizer and guar-xanthan (0.1%, 0.3%, and 0.5%) as a stabilizer were added in PuOC layer, while zein layer stayed unchanged in all film compositions. Obtained results showed that the optimal mechanical properties had film with the lowest concentration of glycerol (30%) and the highest concentration of guar-xanthan (0.5%). Films showed poor barrier for water vapour, typical for biopolymer-based films. However, all tested films were very good barrier to O2 (transmission rate lower than 50 ml/m2/day at 1 bar). On the other hand, with increase of concentration of added substances, transmission rate of CO2 increased.
Sažetak
Cilj ovog rada je da se ispita uticaj različite koncentracije glicerola i guar-ksantana na osobine dvoslojnog filma na bazi pogače uljane tikve golice (PuOC) i kukuruznog zeina, kao i da se pronađe optimalna koncentracija ovih aditiva koja će dati filmove sa najboljim mehaničkim i barijernim osobinama. Različite koncentracije glicerola (30%, 40% i 50%) i guar-ksantana (0,1%, 0,3% i 0,5%) su dodate u PuOC sloj, dok je sastav zeinskog sloja ostao nepromenjen. Dobijeni rezultati pokazuju da najbolje mehaničke osobine ima film sa najmanjom koncentracijom glicerola (30%) i najvećom koncentracijom guar-ksantana (0,5%). Filmovi su pokazali lošiju barijeru prema vodenoj pari, a dobijene vrednosti su tipične za biopolimerne filmove. Međutim, svi ispitivani filmovi su pokazali veoma dobru barijeru za O2 (brzina propustljivosti manja od 50 ml/m2/danu na 1 bar). Sa druge strane, sa povećanjem koncentracije dodatih aditiva, došlo je do povećanja brzine propustljivosti CO2.
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