000			02786nam a2200289Ia 4500
003			MX-MdCICY
005			20250625160146.0
040			_cCICY
090			_aB-16151
245	1	0	_aDevelopment of films based on blends of gelatin and poly(vinyl alcohol)cross linked with glutaraldehyde
490	0		_vFood hydrocolloids, 25(7), p.1751-1757, 2011
520	3		_aBoth gelatin and poly(vinyl alcohol)(PVA)can be cross linked with glutaraldehyde (GLU). In the case of gelatin, the GLU reacts with each ?-NH2 functional group of adjacent lysine residues, while for PVA, the GLU reacts with two adjacent hydroxyl groups, forming acetal bridges. Thus it can be considered possible to cross link adjacent macromolecules of gelatin and PVA using GLU. In this context, the aims of this work were the development of biodegradable films based on blends of gelatin and poly(vinyl alcohol)cross linked with GLU, and the characterization of some of their main physical and functional properties. All the films were produced from film-forming solutions (FFS)containing 2 g macromolecules (PVA + gelatin)/100 g FFS, 25 g glycerol/100 g macromolecules, and 4 g GLU (25 percent solution)/100 g FFS. The FFS were prepared with two concentrations of PVA (20 or 50 g PVA/100 g macromolecules)and two reaction temperatures: 90 or 55 °C, applied for 30 min. The films were obtained after drying (30 °C/24 h)and conditioning at 25 °C and 58 percent of relative humidity for 7 days, and were then characterized. The results for the color parameters, mechanical properties, phase transitions and infrared spectra showed that some chemical modifications occurred, principally for the gelatin. However, in general, all the characteristics of the films were either typical of films based on blends of these macromolecules without cross linking, or slightly higher. A greater improvement in the properties of this material was probably not observed due to the crystallinity of the PVA, which has a melting point above 90 °C. The presence of microcrystals in the polymer chain probably reduced macromolecular mobility, hindering the reaction. Thus more research is necessary to produce biodegradable films with improved properties.
650	1	4	_aBIODEGRADABLE FILMS
650	1	4	_aBIOPOLYMER
650	1	4	_aPROTEIN
650	1	4	_aCHEMICAL MODIFICATION
650	1	4	_aPHYSICAL PROPERTIES
700	1	2	_aAlves, P. M.
700	1	2	_aCarvalho, R. A.
700	1	2	_aMoraes, I. C.
700	1	2	_aLuciano, C. G.
700	1	2	_aBittante, A. M. Q.
700	1	2	_aSobral, P. J.
856	4	0	_uhttps://drive.google.com/file/d/1I_-ieHjFzdKsCrjOObxnhdvDOLHyBa_9/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
942			_2Loc _cREF1
008			250602s9999 xx |||||s2 |||| ||und|d
999			_c50325 _d50325