Preparation of antimicrobial films from agricultural biomass

Seber, Ayşe Gizem
Mainly used food packaging materials are petro-chemical based polymers which present environmental problems since they are not biodegradable and ecologically sustainable. In this study, biodegradable biofilms are produced from xylan, extracted from cotton stalk which is an agricultural biowaste without nutritional value. Antimicrobial property was given to the biofilms with either titanium dioxide sol-gel coatings or titanium dioxide powder addition into the biofilm forming solutions. The antimicrobial activities of biofilms were tested against Escherichia coli. Among two different sol-gels coated and at different temperatures dried biofilms, BWX and CSX-50 biofilms treated at 120°C and coated with SiO2/TiO2 showed 88±1% and 75±2% antimicrobial activities, respectively. Same samples treated at the same conditions but coated with non-SiO2 added TiO2 sol-gel yielded 63±3% and 63±2% antimicrobial activities, respectively after 2 h black light illumination. So, it was determined that the highest photocatalytic antimicrobial property was achieved with SiO2/TiO2 coated biofilms. Moreover different concentrations of TiO2 powder were integrated into xylan based biofilms and 100% photocatalytic inactivation was gathered at 5% (w/w) TiO2 addition achieved at both biofilms at the end of 90 min black light illumination. Biodegradability properties of the biofilms were investigated in soil burial test during 180 days and 10% (w/w) TiO2 powder added CSX-50 biofilms were recorded to be 91% biodegradable where non-powder added blank biofilms was found to be 95% biodegradable.


Preparation and characterization of biodegradable composite systems as hard tissue supports: bone fillers, bone regeneration membranes and scaffolds
Sezer, Ümran Aydemir; Hasırcı, Nesrin; Department of Biomedical Engineering (2012)
In tissue engineering applications, use of biodegradable and biocompatible materials are essential. As the tissue regenerate itself on the material surface, the material degrades with enzymatic or hydrolytic reactions. After a certain time, natural tissue takes the place of the artificial support. Poly(ε-caprolactone) (PCL) is one of the preferable polymers used in the restoration of the bone defects due to its desirable mechanical properties and biocompatibility. Addition of inorganic calcium phosphate par...
The Effects of type and amount of organically modified montmorillonites on thermal degradation behavior and mechanical properties of poly(lactic acid)
Özdemir, Esra; Hacaloğlu, Jale; Tinçer, Teoman; Department of Polymer Science and Technology (2014)
Biodegradable polymers have gained considerable interest as a consequence of significant environmental friendly properties like biocompatibility and ability to synthesis from renewable resources. Even though many biodegradable polymers present comparable properties with petrochemical polymers, there are still many technical barriers like poor thermal resistance, and/or mechanical properties. To overcome these drawbacks, generally, nano-sized materials are incorporated into the continuous matrix. Therefore, ...
Tarımsal atıklardan elde edilen hemiselüloz temelli biyopolimerlerden ekstrüzyon vasıtası ile filmlerin üretilmesi
Bölükbaşı, Ufuk; Özkan, Necati; Bahçegül, Erinç; Akınalan, Büşra; Erdemir, Duygu(2014)
Majority of materials used in daily life are produced by using petroleum based polymers. However sustainability of such production processes is problematic when it is considered that petroleum is not a renewable resource in addition to the environmental pollution caused by petroleum based products. Currently, biopolymers are more frequently utilized as an alternative to petroleum based polymers. Due to their low cost because of the waste status and abundance, lignocellulosic agricultural wastes are among th...
Investigation of processing parameters on production of hemicellulose based films from different agricultural residues via extrusion
Akınalan, Büşra; Bölükbaşı, Ufuk; Özkan, Necati; Department of Chemical Engineering (2014)
Today, due to the environmental concerns about petroleum based polymers, the use of renewable polymers including polysaccharides in food packaging applications is increasing rapidly. In the present study, hemicellulose was extracted from corn cobs, wheat straw and sunflower stalks, and two different techniques, solvent casting and extrusion, were utilized for biodegradable film production. Films produced from different types of biomasses were compared in terms of their mechanical, thermal and morphological ...
Manufacturing and analysis of thermal and chemical properties of potato starch - gelatin biofilms
Yılmaz, Seçil; Yıldız, Fatih; Yanık, Tülin; Department of Biotechnology (2012)
Today bioplastics, which are defined as environmentally friendly new generation plastics, take place on the market as bags, foam fillers and food tableware. In this study, it was aimed to obtain biodegradable films using starch and gelatin. Thermal, mechanical, permeability and optical properties of films based on potato starch and bovine gelatin plasticized with glycerol and citric acid monohydrate were investigated. Film formulations of different ratios of potato starch to gelatin (1:0, 1:1, 2:1, 1:2, and...
Citation Formats
A. G. Seber, “Preparation of antimicrobial films from agricultural biomass,” M.S. - Master of Science, Middle East Technical University, 2010.