title: Effect of different new packaging materials on biscuit quality during accelerated storage.
abstract: BACKGROUND
  The effect of innovative multilayer packaging materials versus a standard one on biscuit quality was studied during accelerated storage at 25, 35, 45 °C and 50% relative humidity for 92 days. Three different packaging materials were used: metalized orientated polypropylene (OPP)/paper (control); metalized poly-lactic acid (PLA)/paper; metalized OPP with ethylene vinyl acetate pro-oxidant additive (EVA-POA)/paper. EVA-POA additive is used to make the plastic layer biodegradable. Various quality sample parameters (moisture, water activity (aw ), texture, peroxide value (PV), hexanal) were analysed during storage. Rate constants (k) and activation energies (Ea ) of hydration reactions and hexanal formation were calculated.
  
  
  RESULTS
  No remarkable differences in the evolution of primary and secondary lipid oxidation were observed among differently packed biscuits during storage. All samples maintained PV levels between 4 and 14 meq O2 kg(-1) oil. The product in flexible packaging with PLA reached the highest moisture and aw levels, but they did not significantly and adversely affect the other quality characteristics.
  
  
  CONCLUSIONS
  The obtained results demonstrate that the new tested packaging materials were suitable for commercial biscuit storage, having similar performance and preservation effects on the overall product quality to those of the standard one. Furthermore, these results could make a contribution to the food industry, encouraging the use of packaging materials with a negligible environmental impact as an alternative to petroleum-based ones.
authors.affiliation: Interdepartmental Centre for Agri-Food Industrial Research, University of Bologna, 47521, Cesena (FC), Italy; Department of Agri-Food Science and Technology, Alma Mater Studiorum, University of Bologna, 47521, Cesena (FC), Italy.
authors.forename: Santina
authors.initials: S
authors.lastname: Romani
authors.forename: Silvia
authors.initials: S
authors.lastname: Tappi
authors.forename: Federica
authors.initials: F
authors.lastname: Balestra
authors.forename: Maria Teresa
authors.initials: MT
authors.lastname: Rodriguez Estrada
authors.forename: Valentina
authors.initials: V
authors.lastname: Siracusa
authors.forename: Pietro
authors.initials: P
authors.lastname: Rocculi
authors.forename: Marco
authors.initials: M
authors.lastname: Dalla Rosa
mesh_terms: D005030:Ethylenes; D018857:Food Packaging / Q000295:instrumentation*; D005519:Food Preservation / Q000379:methods*; D063427:Food Quality; D006813:Humidity; D019344:Lactic Acid; D015227:Lipid Peroxidation; D008670:Metals; D010209:Paper; D011091:Polyesters; D011108:Polymers; D011126:Polypropylenes; D011145:Polyvinyls; D014753:Vinyl Compounds; D014867:Water / Q000032:analysis
chemical_list: D005030:Ethylenes; D008670:Metals; D011091:Polyesters; D011108:Polymers; D011126:Polypropylenes; D011145:Polyvinyls; D014753:Vinyl Compounds; D014867:Water; C016438:ethylenevinylacetate copolymer; D019344:Lactic Acid; C033616:poly(lactide); C011566:vinyl acetate
keywords: biscuits; innovative packaging; quality; shelf-life