Volume 43, Issue 10 e14121
ORIGINAL ARTICLE

Effect of active edible coating and temperature on quality properties of roasted pistachio nuts during storage

Sara Khoshnoudi-Nia

Corresponding Author

Sara Khoshnoudi-Nia

Department of Food Science and Technology, Faculty of Agriculture, Ferdowsi University, Mashhad, Iran

Correspondence

Sara Khoshnoudi-Nia, Naser Sedaghat, Department of Food Science and Technology, Faculty of Agriculture, Ferdowsi University, PO Box: 91775-1163, Mashhad, Iran.

Emails: [email protected]; [email protected]

Search for more papers by this author
Naser Sedaghat

Corresponding Author

Naser Sedaghat

Department of Food Science and Technology, Faculty of Agriculture, Ferdowsi University, Mashhad, Iran

Correspondence

Sara Khoshnoudi-Nia, Naser Sedaghat, Department of Food Science and Technology, Faculty of Agriculture, Ferdowsi University, PO Box: 91775-1163, Mashhad, Iran.

Emails: [email protected]; [email protected]

Search for more papers by this author
First published: 21 July 2019
Citations: 33

Abstract

The present study investigated the effect of gelatin coating (GL) containing ascorbic acid (AA:10 g/L) and/or propyl gallate (PG:0.1 g/L) on the chemical (peroxide value (PV); anisidine value (AnV) and free fatty acid (FFA)), instrumental texture (Hardness), and the sensory properties (texture, rancidity, taste, color, and overall acceptability) of roasted pistachio nuts during 3 months of storage at 20, 35, and 50°C. The relationship between PV, AnV, FFA, and rancidity taste beside instrumental hardness and sensory texture were assessed by Pearson's correlation coefficient. Pistachio nuts were treated with five formulations: control, AA + PG, GL + PG, GL + AA, and GL + AA + PG. The antioxidative activity of the GL was more effective at the lower temperature. Instrumental hardness of gelatin-coated samples was significantly (p < 0.05) higher than other samples at 20 and 35°C. Instrumental hardness in control samples increased, while samples with gelatin coating showed a decreasing trend. Gelatin-antioxidant coatings didn't affect the total acceptance of samples but provided protection against lipid oxidation. Positive and powerful correlation (R > 0.9) was found between sensory and chemical and textural properties.

Practical applications

The use of thin gelatin edible coating containing AA and/or PG, as a natural and economical secondary package, show a good potential for reducing the rate of lipid oxidation and subsequently increasing the shelf life of roasted pistachio nuts, especially at room temperature.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.