Structure and mechanical properties of sodium and calcium caseinate edible active films with carvacrol


Autoria(s): Arrieta, Marina Patricia; Peltzer, Mercedes Ana; Garrigós Selva, María del Carmen; Jiménez, Alfonso
Contribuinte(s)

Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología

Análisis de Polímeros y Nanomateriales

Data(s)

05/06/2014

05/06/2014

01/02/2013

Resumo

Edible active films based on sodium caseinate (SC) and calcium caseinate (CC) plasticized with glycerol (G) at three different concentrations and carvacrol (CRV) as active agent were prepared by solvent casting. Transparent films were obtained and their surfaces were analysed by optical microscopy and scanning electron microscopy (SEM). The influence of the addition of three different plasticizer concentrations was studied by determining tensile properties, while Fourier transformed infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) were used to evaluate the structural and thermal behavior of such films. The addition of glycerol resulted in a reduction in the elastic modulus and tensile strength, while some increase in the elongation at break was observed. In general terms, SC films showed flexibility higher than the corresponding CC counterparts. In addition, the presence of carvacrol caused further improvements in ductile properties suggesting the presence of stronger interactions between the protein matrix and glycerol, as it was also observed in thermal degradation studies. FTIR spectra of all films showed the characteristic bands and peaks corresponding to proteins as well as to primary and secondary alcohols. In summary, the best results regarding mechanical and structural properties for caseinates-based films containing carvacrol were found for the formulations with high glycerol concentrations.

Marina Patricia Arrieta thanks Fundación MAPFRE for “Ignacio Hernando de Larramendi 2009- Medio Ambiente” fellowship (MAPFRE-IHL-01). The Spanish Ministry of Economy and Competitiveness is acknowledged by financial support (project Ref. MAT2011-28468-C02-01).

Identificador

Journal of Food Engineering. 2013, 114(4): 486-494. doi:10.1016/j.jfoodeng.2012.09.002

0260-8774 (Print)

1873-5770 (Online)

http://hdl.handle.net/10045/37888

10.1016/j.jfoodeng.2012.09.002

Idioma(s)

eng

Publicador

Elsevier

Relação

http://dx.doi.org/10.1016/j.jfoodeng.2012.09.002

Direitos

info:eu-repo/semantics/openAccess

Palavras-Chave #Edible films #Caseinates #Glycerol #Carvacrol #Active packaging #Química Analítica
Tipo

info:eu-repo/semantics/article