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Shelf life extension of walnut kernels using rice starch-based edible coating formulations


Karim, Roselina and Aghazadeh, Mona and Sultan, Mohammad Tauseef and Abdul Rahman, Russly (2014) Shelf life extension of walnut kernels using rice starch-based edible coating formulations. In: Malaysia International Halal Research & Education Conference 2014 (MIHREC 2014), 2-4 Dec. 2014, Marriott Putrajaya Hotel, Malaysia. (p. 297).


The shelf life of raw walnut kernel is limited due to the influenced of various factors such as its chemical composition, storage condition and environments etc. The effects of five different rice starch-based edible coating formulations on the chemical, physicochemical and textural properties of coated walnut kernels were studied. The peroxide value, anisidine value, totox value, free fatty acid content, hexanal content, color, moisture content, and textural properties were monitored in coated walnuts stored at accelerated temperature (60°C). Results indicated that the coated walnuts had a better quality in terms oxidative stability based on all the chemical indicators of rancidity, and a firmer texture when compared to the uncoated ones, even after 20 days of storage at high temperature. The walnut kernels that were coated with the basic rice starch formulation can be stored longer than the uncoated control samples i.e. with additional of 6 to7 days at 60°C. However, the color of the coated sample was significantly (P≤0.05) lighter than the control group with L values of 49.86 and 46.88, respectively. The predicted shelf life based on calculation showed that the shelf life of the walnut kernels can be extended to 1024 days from 160 days at storage temperature of 20 ± 2°C.It can be concluded that the physicochemical and storage qualities of walnut kernels can be improved by addition of palm oil or chitosan to the rice starch-based edible coating formulations.

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Additional Metadata

Item Type: Conference or Workshop Item (Other)
Divisions: Faculty of Food Science and Technology
Halal Products Research Institute
Publisher: Halal Products Research Institute, Universiti Putra Malaysia
Keywords: Walnut; Stability; Coating; Chitosan; Rancidity; Fracturability
Depositing User: Nabilah Mustapa
Date Deposited: 02 Jul 2018 02:58
Last Modified: 02 Jul 2018 02:58
URI: http://psasir.upm.edu.my/id/eprint/64200
Statistic Details: View Download Statistic

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