Dried Ca-alginate films were manufactured±pectin or soy protein isolate (SPI) as well dried un-gelled (no Ca2+) pure alginate films: conditioned at either 57% or 100% relative humidity (RH). With the exception of the un-gelled alginate films, all films conditioned at 100% RH were more transparent than at 57% RH. High RH films resulted in higher % elongation at break, distance and work to puncture values than their corresponding films conditioned at 57% RH. ATR-FTIR scans showed several peak shifts when the film forming solutions were gelled with Ca2+ and when the ‘wet’ films were dried.
No takes yet. Share an insight, caveat, or question.
Barbut et al. (2020) studied this question.