000			03396nam a22003737a 4500
003			EC-UrYT
005			20221219092102.0
008			150116t9999 mx r gr 000 0 spa d
040			_cEC-UrYT
041			_aeng _bspa
100	1		_914883 _aGarcía Pinos, Katherine Andrea _eautor
245	1	0	_aModified Chitosan Films with CPH-based additives for Food Packing Applications / _cKatherine Andrea García Pinos ; tutor Manuel Caetano Sousa
264		4	_aUrcuquí, _c2022
300			_a93 hojas : _bilustraciones (algunas a color) ; _c30 cm + _e1 CD-ROM
502			_aTrabajo de integración curricular _b(Químico/a). _cUniversidad de Investigación de Tecnología Experimental Yachay. _gUrcuquí, _d2022
504			_aIncluye referencias bibliográficas (páginas 57-66)
506			_aTrabajo de integración curricular con acceso abierto
516			_aTexto (Hypertexto links)
520			_aChitosan films designed with the addition of fillers have been widely studied for their potential application in numerous fields. In this project, chitosan nanocomposite films were prepared using additives extracted from cocoa pod husk (CPH). High molecular weight chitosan was used as the matrix, and cellulose nanocrystals (CNC), dialdehyde nanocellulose (DANC), and phenolic extracts (PCPH), as the functional additives. These additives were used to improve the chitosan's mechanical and barrier properties. The focus of this thesis was the extraction of CPH-additives for the processing and characterization of films for food packing applications. Cellulose was extracted via alkaline treatment combined with bleaching and enzymatic hydrolysis. FTIR analysis and X-ray diffraction studies revealed alkaline treatment derivatives in high crystalline cellulose, while the enzymatic one results in holocellulose. The three additives were blended separately with chitosan as a matrix and glycerol as a plasticizer at different ratios to obtain homogeneous films except for the DANC formulation. The microscopy study showed no CNC aggregations but did it for DANC on a micro-scale. Crosslinking was efficiently performed on DANC films by forming a Shiff base. Mechanical testing revealed decreased chitosan's tensile strength by adding 0.5% glycerol and additives, showing better performance at the addition of 3% CNC. All formulations can be UV-blockers. Moreover, barrier properties slightly improved by adding CNC and DANC, while PCPH formulated films reveal inhibition of moho growth. Chitosan-based films have the potential to be used in the food industry as bio packaging materials, with the chance to be improved to act as active packing.
546			_aTextos en inglés con resúmenes en español e inglés
650		0	_914884 _aCocoa pod husk
650		0	_913169 _aChitosan
650		0	_98664 _aNanocomposites (Materials)
650		0	_914885 _aCáscara de la mazorca de cacao
650		0	_914886 _aChitosano
650		0	_911235 _aNanocompositos
650		0	_938 _aQuímica _vTrabajos y disertaciones académicas
700	1		_913416 _aCaetano Sousa, Manuel _etutor
700	1		_913120 _aDe Lima Eljuri, Lola María _etutor
710	1		_911232 _aUniversidad de Investigación de Tecnología Experimental Yachay. _bEscuela de Ciencias Químicas e Ingeniería
856			_zVer recurso _uhttp://repositorio.yachaytech.edu.ec/handle/123456789/530
942			_2ddc _cTIC
999			_c4334 _d4334