Abstract
The use of natural polymers, such as gelatin and other proteins, has increased in an attempt to replace part of the consumption of petroleum-based packaging. This study evaluated the influence of green tea extract and lemon nanoemulsion on mechanical, thermal and permeability properties of gelatin matrix. The results showed that green tea increased the gelatin tensile strength (TS) from 86 ± 7 MPa to 101 ± 5 MPa, on the other hand, the nanoemulsion decreases to 78 ± 8 MPa. The incorporation of green tea and nanoemulsion enhanced the water vapor permeability of gelatin film; this could be due to the interacting with the hydrophobic domains of gelatin. This was indicated by melting point (Tm) in differential scanning calorimetry (DSC) and degradation temperatures in the thermogravimetric analysis (TG), respectively. Changes in FTIR spectra of gelatin film were observed when the green tea and nanoemulsion were incorporated. Therefore, this study showed a new characterization and formulation of gelatin films incorporated by green tea extract and lemon nanoemulsion and their potential for edible film.
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Acknowledgements
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001. 2019. Grant 2019/06170-1 and 2013/07296-2 CEPID, São Paulo Research Foundation (FAPESP). The authors are thankful to Embrapa Instrumentation.
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Nunes, J.C., Melo, P.T.S., Lorevice, M.V. et al. Effect of green tea extract on gelatin-based films incorporated with lemon essential oil. J Food Sci Technol 58, 1–8 (2021). https://doi.org/10.1007/s13197-020-04469-4
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DOI: https://doi.org/10.1007/s13197-020-04469-4