Food waste valorization, considered as energy and/or chemicals source, via biorefinery or biotechnology, gained great attention in recent years, because of the fast depletion of primary resources, increased waste generation and landfilling worldwide. Coffee is one important, widespread source of by-products and waste (i.e. coffee pulp, coffee husks, silver skin, spent coffee, etc.). It has been investigated in different forms either as a source of antioxidant and valuable chemicals and as a filler in composites. Silver skin (SSK) for example, which is the integument surrounding the coffee beans, constitutes about the 3 wt% of the original treated product and after the roasting process, it becomes a by-product. The valorization of SSK, up to now just sent to damping, is here investigated through the preparation of particulate biocomposites based on poly(lactic acid) (PLA) and poly(butylene succinate) (PBS), two of the most common aliphatic biodegradable polyesters, commercially available. In the current research a characterization of the polyphenols content and antioxidant activity of SSK, the tensile properties and dynamic mechanical response of the biocomposites together with their stability toward photo oxidation have been reported. This approach has a high potential as to what concerns the application of renewable polymers, because some properties (i.e durability) can be improved, the amount of polymer matrix (presently more expensive than oil-derived materials) can be reduced, and the waste damping can be avoided.
Valorization of Coffee Silverskin in Green Particulate Composites based on PLA and PBS.
Grazia Totaro
;
2022-01-01
Abstract
Food waste valorization, considered as energy and/or chemicals source, via biorefinery or biotechnology, gained great attention in recent years, because of the fast depletion of primary resources, increased waste generation and landfilling worldwide. Coffee is one important, widespread source of by-products and waste (i.e. coffee pulp, coffee husks, silver skin, spent coffee, etc.). It has been investigated in different forms either as a source of antioxidant and valuable chemicals and as a filler in composites. Silver skin (SSK) for example, which is the integument surrounding the coffee beans, constitutes about the 3 wt% of the original treated product and after the roasting process, it becomes a by-product. The valorization of SSK, up to now just sent to damping, is here investigated through the preparation of particulate biocomposites based on poly(lactic acid) (PLA) and poly(butylene succinate) (PBS), two of the most common aliphatic biodegradable polyesters, commercially available. In the current research a characterization of the polyphenols content and antioxidant activity of SSK, the tensile properties and dynamic mechanical response of the biocomposites together with their stability toward photo oxidation have been reported. This approach has a high potential as to what concerns the application of renewable polymers, because some properties (i.e durability) can be improved, the amount of polymer matrix (presently more expensive than oil-derived materials) can be reduced, and the waste damping can be avoided.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
