Effect of microalgae addition on active biodegradable starch film

Starch–gelatin film as an alternative to the use of plastics in agriculture: a review

“…In order to understand the degradation of polymers, it must be considered that they can be degraded by thermal, oxidative, chemical, radioactive, and mechanical means, as well as by biological agents . The biodegradability of the film is directly related to its solubility since this property makes the material available to the microorganisms in the soil, which includes bacteria, fungi and protozoa …”

“…It was observed that the films containing 25 g kg −1 of gelatin degraded in 25 days, the films with 150 g kg −1 of gelatin lost 50% of their mass in 17 weeks . Films made from cassava starch with biomass or a microalgae Heterochlorella luteoviridis and Dunaliella tertiolecta extract added to them lost about 70% and 55% of their mass, respectively, after 15 days . After 20 days, films made of gelatin recovered from chrome leather waste were degraded by 30%.…”

“…73 The biodegradability of the film is directly related to its solubility since this property makes the material available to the microorganisms in the soil, which includes bacteria, fungi and protozoa. 95 The biodegradability occurs through the interaction of microbiological life when in contact with the soil due to the expulsion of enzymes that initiate the polymer degradation, resulting in the hydrolysis of the films. 96 Water availability in soil is also a factor that can promote fast degradation of the polymer.…”

“…74 Films made from cassava starch with biomass or a microalgae Heterochlorella luteoviridis and Dunaliella tertiolecta extract added to them lost about 70% and 55% of their mass, respectively, after 15 days. 95 After 20 days, films made of gelatin recovered from chrome leather waste were degraded by 30%. In 120 days, around 80% degradation was observed.…”

Propiedades Microestructurales y Ópticas de Películas Biodegradables a Base de Almidón Termoplástico y Poli (ε-Caprolactona) con Actividad Antioxidante

“…Talón et al, (2017) reportaron que la adición de un extracto de tomillo rico en fenoles a una matriz de almidón termoplástico con quitosano generó cambios en el color obteniendo un polímero más oscuro, más rojizo y menos transparente, las películas presentaron algunos cambios en la microestructura, mejorando las propiedades físicas y mecánicas, además este material contiene capacidad antioxidante. En un estudio homólogo, Carissimi et al, (2018) adicionaron un extracto de micro algas a una matriz de almidón de yuca, las películas con el extracto presentaron un incremento en la elongación de la película, esfuerzo a la ruptura y disminuyeron el esfuerzo a la tensión y el módulo de Young; éstas películas fueron usadas como un recubrimiento de salmón, lo cual disminuyó la pérdida de humedad y retraso la oxidación lipídica en el pescado.…”