TY - JOUR
T1 - UV-protecting films based on bacterial cellulose, glycerol and polyvinyl alcohol
T2 - effect of water activity on barrier, mechanical and optical properties
AU - Cazón, Patricia
AU - Velazquez, Gonzalo
AU - Vázquez, Manuel
N1 - Publisher Copyright:
© 2020, Springer Nature B.V.
PY - 2020/9/1
Y1 - 2020/9/1
N2 - Abstract: Biodegradable films based on bacterial cellulose, glycerol and polyvinyl alcohol are a new alternative to develop food packaging with the capacity to retard or inhibit the effect of UV radiation. However, these compounds are sensitive to moisture. Therefore, the purpose of this study was to evaluate the modifications of the mechanical, water vapor permeability and optical properties of these composite films depending on their water activity. Results showed that water molecules acted as a plasticizer agent, modifying the mechanical, water vapor permeability and optical properties of the developed films. However, an overplastification process took place at higher activity water, resulting in a weakness of film structure and decreasing drastically the elongation. The transmittance in the UV–VIS light region decreased when the activity water increased. No significant variations were observed in color, transparency or opacity properties. Graphic abstract: [Figure not available: see fulltext.].
AB - Abstract: Biodegradable films based on bacterial cellulose, glycerol and polyvinyl alcohol are a new alternative to develop food packaging with the capacity to retard or inhibit the effect of UV radiation. However, these compounds are sensitive to moisture. Therefore, the purpose of this study was to evaluate the modifications of the mechanical, water vapor permeability and optical properties of these composite films depending on their water activity. Results showed that water molecules acted as a plasticizer agent, modifying the mechanical, water vapor permeability and optical properties of the developed films. However, an overplastification process took place at higher activity water, resulting in a weakness of film structure and decreasing drastically the elongation. The transmittance in the UV–VIS light region decreased when the activity water increased. No significant variations were observed in color, transparency or opacity properties. Graphic abstract: [Figure not available: see fulltext.].
KW - Bacterial cellulose
KW - GAB model
KW - Mechanical properties
KW - Moisture adsorption isotherms
KW - Plasticization
KW - UV-barrier properties
UR - http://www.scopus.com/inward/record.url?scp=85088248512&partnerID=8YFLogxK
U2 - 10.1007/s10570-020-03346-9
DO - 10.1007/s10570-020-03346-9
M3 - Artículo
AN - SCOPUS:85088248512
SN - 0969-0239
VL - 27
SP - 8199
EP - 8213
JO - Cellulose
JF - Cellulose
IS - 14
ER -