Food Research Institute

Ghadermazi, R. – Keramat, J. – Goli, S. A. H.
Antioxidant activity and physical properties of hydroxypropylmethylcellulose films enriched with essential oils
Journal of Food and Nutrition Research, 55, 2016, No. 1, s. 22-32

Reza Ghadermazi, Department of Food Science and Technology, College of Agriculture, Isfahan University of Technology, Khomeynishahr road, 84156-83111 Isfahan, Iran. Tel: +98-311-3913380, fax: +98-311-3912254, e-mail: r.ghadermazy@ag.iut.ac.ir

Received 27 April 2015; 1st revised 12 August 2015; 2nd revised 2 September 2015; 3rd revised 8 October 2015; accepted 12 October 2015; published online 15 January 2016.

Summary: In this study, the antioxidant activity and physical properties, such as water vapour permeability (WVP), oxygen permeability (OP), mechanical and optical properties of hydroxypropylmethylcellulose (HPMC) films containing essential oils of clove buds, sage and oregano were evaluated. Clove essential oil showed higher antioxidant activity in 2,2-diphenyl-1-picryl hydrazine (DPPH) radical-scavenging assay (IC₅₀ = 2.71 µg·ml^-1) and in a reduction power assay (IC₅₀ = 53.54 µg·ml^-1) but, in beta-carotene-bleaching test, butylated hydroxytoluene (BHT) showed higher (IC₅₀ = 62.86 µg·ml^-1) antioxidant activity. The results showed that addition of essential oils into HPMC films led to a significant decrease in WVP (2.30–1.49 ng·Pa^-1m^-1s^-1), OP (488.78–235.95 ml·µm·kPa^-1m^-2d^-1), colour differences (0–38.91), tensile strength (27.35–7.21 MPa), elongation at break (23.6–17.9%) and elastic modulus (537.54–202.12 MPa). Also, soybean oil without antioxidant was packed by HPMC films and some soybean oil samples after addition of the same essential oils and packed in glass bottles stored at accelerated conditions. The HPMC films combined with essential oils showed a moderate effect against soybean oil oxidation. In comparison between the films, HPMC film combined with clove essential oil was the most effective protectant against oxidation (43.3%).

Keywords: antioxidant packaging; edible film; essential oil; hydroxypropylmethylcellulose

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