Physico-chemical, antimicrobial and antioxidant properties of gelatin-chitosan based films loaded with nanoemulsions encapsulating active compounds
Pérez-Córdoba, Luis J. and Norton, Ian T. and Batchelor, Hannah K. and Gkatzionis, Konstantinos and Spyropoulos, Fotios and Sobral, Paulo J.A. (2018) Physico-chemical, antimicrobial and antioxidant properties of gelatin-chitosan based films loaded with nanoemulsions encapsulating active compounds. Food Hydrocolloids, 79. pp. 544-559. ISSN 0268-005X (https://doi.org/10.1016/j.foodhyd.2017.12.012)
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Abstract
The aim of this research was to develop and characterize gelatin-chitosan (4:1) based films that incorporate nanoemulsions loaded with a range of active compounds; N1: canola oil; N2: α-tocopherol/cinnamaldehyde; N3: α-tocopherol/garlic oil; or N4: a-tocopherol/cinnamaldehyde and garlic oil. Nanoemulsions were prepared in a microfluidizer with pressures ranging from 69 to 100 MPa, and 3 processing cycles. Films were produced by the casting method incorporating 5 g N1,2,3,4/100 g biopolymers and using glycerol as a plasticizer, and subsequently characterized in terms of their physico-chemical, antimicrobial and antioxidant properties. No differences (p > 0.05) were observed for all films in terms of moisture content (18% w/w), and thermal properties. The films' solubility in water and light transmission at 280 nm were considerably reduced as compared to the control, N1 (15% and 60% respectively) because of the nanoemulsion incorporation. The film loaded with N1 showed the greatest (p < 0.05) opacity, elongation at break and stiffness reduction, and was the roughest, whilst the lowest tensile strength and ability to swell were attained by films loaded with N3 and N4, respectively. DSC and X-ray analyses suggested compatibility among the biopolymeric-blend, and a good distribution of nanodroplets embedded into the matrix was confirmed by AFM and SEM analyses. Films loaded with nanoencapsulated active compounds (NAC) were very effective against Pseudomonas aeruginosa, and also showed high antioxidant activity. Overall, the present study offers clear evidence that these active-loaded films have the potential to be utilized as packaging material for enhancing food shelf life.
ORCID iDs
Pérez-Córdoba, Luis J., Norton, Ian T., Batchelor, Hannah K. ORCID: https://orcid.org/0000-0002-8729-9951, Gkatzionis, Konstantinos, Spyropoulos, Fotios and Sobral, Paulo J.A.;-
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Item type: Article ID code: 73318 Dates: DateEvent30 June 2018Published9 December 2017Published Online8 December 2017AcceptedSubjects: Medicine > Pharmacy and materia medica Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences Depositing user: Pure Administrator Date deposited: 23 Jul 2020 11:50 Last modified: 08 Oct 2024 01:02 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/73318