Comparación de la solubilidad y elasticidad en biopelículas elaboradas a partir de harina y almidón de Musa acuminata y Zea mays
Taking into account the large amounts of plastic solid waste generated through excessive use by humans, who are actually responsible for environment pollution and climate change. To solve this problem, this research develops a new option for packaging or coating food, replacing synthetic plastic by...
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| Formato: | bachelorThesis |
| Idioma: | spa |
| Publicado: |
2020
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| Subjects: | |
| Acceso en liña: | http://dspace.unach.edu.ec/handle/51000/7189 |
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Engadir etiqueta | Summary: | Taking into account the large amounts of plastic solid waste generated through excessive use by humans, who are actually responsible for environment pollution and climate change. To solve this problem, this research develops a new option for packaging or coating food, replacing synthetic plastic by biodegradable films. Raw materials such as flour and starch of bananas, black corn, known for their high percentages of protein, crude fiber and starch have been used in these two matrices due to its degradation in a natural way and less time of decomposition. The modified monolayer casting technique was used to produce the biofilms. Next, combined biofilms of banana flour and starch (HB) and (AB1) were designed; also, purple corn flour and starch (AMN) and (AMN1) with concentrations of (100%, 75%, 50%, 25%). Obtaining 5 formulations with three repetitions for each treatment block. The films obtained were transparent, flexible and highly homogeneous. From there, physical and mechanical properties such as humidity, pH, water-resistance, and thickness were evaluated. After the application of a complete random analysis of variance design, the T5 treatment was selected (AB175% and HB 25%), to be optimal since it presents better characteristics based on the time of water resistance with a maximum value of 72 hours. Also, it was demonstrated nonexistence of humidity percentage with a value of 0. 13%. An acceptable pH of 6. 66 (acidic medium) according to the NTE INEN 1462 and NTE INEN 526 respectively too. Finally, a thickness of 0.19 mm is the established value that a biofilm must comply with. It should be noted that thickness is an important property for biodegradable packaging, since the greater the thickness, the lower the effect on the barrier properties. As for the financial evaluation about the benefit-cost, it is viable according to the financial indicators, where a benefit-cost of $0.56 was obtained demonstrating to be feasible the production of biodegradable packaging for black coffee. |
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