Effect of different coatings on the fresh- keeping in Leizhou black duck egg

In this paper,chitosan coating,Bletilla striata medicine coating,chitosan and traditional Chinese medicine composite coating and the plant( peanut) oil coating were selected to investigate the preservative effect of coatings on the Leizhou black duck egg.During the 50 days of storage at room temperature( 27 ℃,humidity 65%),the index values were evaluated.The results showed that compared with the composite group,the compound group and the plant oil group delayed the scattered yellow phenomen for 30 days,the weight loss ratio were significantly reduced( p < 0.01),and the weight loss rate of plant oil group was( 1.61% ± 0.73%),which was the lowest. Storage for30 days,the decline of albumen height was reduced( p < 0.05),storage for 20 days,the decrease of Haugh Unit was significantly slowed down( p < 0.05) in plant oil group,and the antimicrobial effect of plant oil and compound group were increased( p < 0.01) in comparison with the control when the storage time was 30 d. During the whole storage period,the change of p H in compound group was more gentle.In conclusion,the plant oil group was the most effective coating materials. And this study provide a theoretical basis for selecting the optimal preservation coat of duck egg.