Quality and stability evaluation of Guizhou spicy chicken treated with gamma irradiation during the storage period.

Abstract

Irradiation has become a mature processing approach for the quality control of many agricultural products. The effects of gamma irradiation at four different doses (2, 4, 6, and 8kGy) on microbial quality, Hunter's parameter, lipid oxidation, hydrolyzed amino acids (HAAs), and flavor in spicy chicken were investigated. After treatment, all samples were stored at 4°C. The microbiological results showed that the total viable bacteria (TVB) and total coliform count (TCC) were significantly decreased dose dependently. Values of Δa*, Δb*, and ΔE* of the irradiated specimens were lower compared with the control samples, whereas the ΔL* of the irradiated specimens was higher compared with the controls. The peroxide value (POV) was increased by dose augmentation. Contents of HAAs were gradually decreased in both irradiated and control groups. The odor was affected by both doses of irradiation and storage time. Hence, we conclude that irradiation at a dose of 4.0kGy barely affected physicochemical properties during storage and extended the shelf life of spicy chicken. This approach could be an alternative to control the quality of spicy chicken during storage.