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alginate, film, pectin, relative humidity, soy protein isolate, tensile strength


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.

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