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Sandhya Alice Varghese. Development and characterisation of antimicrobial films based on biopolymers. Doctoral Degree(Materials and Production Engineering (International Program)). King Mongkut's University of Technology North Bangkok. Central Library. : King Mongkut's University of Technology North Bangkok, 2022.
Development and characterisation of antimicrobial films based on biopolymers
Name: Sandhya Alice Varghese
keyword:
Antimicrobial activity
LCSH:
Biopolymers
LCSH:
Biodegradation
LCSH:
Food containers
Abstract:
Food wastage and scarcity of food are the major two global concerns we face today. According to a study by United Nations food agency, nearly one-third of the food globally produced is wasted or spoiled every year leading to economic losses as well as damage to environment. Improved technology can control this loss to a limit during various stages of food processing. Microbial attack is the major cause of food spoilage leading to reduced shelf life of food products. Currently we witness a growing demand for innovative ways to inhibit microbial attack in food while maintaining quality, freshness and safety. Active packaging is a recent development in this field which facilitates the addition of active agents so as to supplement a desired property to the food enclosed. Antimicrobial packaging is one type of active packaging, which provides increased margin of food safety and quality. It has received a great deal of attention since the last decade. Such wraps extend the shelf-life of food by reducing the risk of pathogen by inhibiting or retarding their growth and spread. These antimicrobial packaging systems consist of a base polymer incorporated with an antimicrobial agent. The growing awareness about the threat posed by petroleum-based plastics has called for a shift for use of biopolymer. In the present doctoral research, antimicrobial packaging films based on biopolymer and natural antimicrobial agents are developed by economic and simple technique of solvent casting. Three different kinds antimicrobial films are developed in this way.
In the first study, antimicrobial activity of natural fibre is studied by incorporating a novel natural fibre called Ceiba pentandra fibre in Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) polymer. The addition of this fibre improves the biodegradability to the base matrix considerably along with imparting adequate mechanical strength to the system. The microbial inhibition against Gram-positive bacteria was excellent; however, the developed films fail to resist the growth of Gram-negative pathogen. The application of the films was tested as packaging wraps for fresh strawberries for 7 days. In the second approach, three different kinds of essential oils encapsulated in silica nanocontainers were subsequent loaded in PHBV cast films. The incorporation of oil improved the flexibility of the films, while the biodegradability remained unaffected. The antimicrobial test revealed that the films with oil encapsulated in nanosilica showed improved activity up to 14 days. On a final note, strawberries packed in these high activity films resisted mold growth and maintained the freshness of fruit up to 7 days. In the third methodology, nutmeg and tamarind extracts were used as antimicrobial compounds in starch/Polyvinyl alcohol matrix. Both the extract addition improved the biodegradability and flexibility of the matrix considerably. One notable improvement was seen in the UV-barrier properties of the films. The UV-blocking capacity of the composite films was high making it apt for the packaging of light-sensitive foods. The antimicrobial activity of the films was improved with extract addition which was evident from the packaging studies conducted on fresh green chillies for 7 days. The three different kinds of films prepared are suggested to be good candidates for active antimicrobial ecofriendly packaging of perishable fruits.
King Mongkut's University of Technology North Bangkok. Central Library
Address:
BANGKOK
Email:
library@kmutnb.ac.th
Name: Suchart Siengchin
Role:
dissert advisor
Email :
suchart.s.pe@tggs-bangkok.org
Created:
2022
Modified:
2567-09-17
Issued:
2024-09-17
วิทยานิพนธ์/Thesis
application/pdf
eng
DegreeName: Doctor of Engineering
Level: Doctoral Degree
©copyrights King Mongkut's University of Technology North Bangkok
RightsAccess:
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Sandhya Alice Varghese
| Title | Contributor | Type |
|---|---|---|
| Development and characterisation of antimicrobial films based on biopolymers
มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าพระนครเหนือ Sandhya Alice Varghese | Suchart Siengchin | วิทยานิพนธ์/Thesis |
Suchart Siengchin