《Table 1 EA of EPS at diff erent intervals》

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《"Isolation, Purification, and Characterization of Exopolysaccharide Produced by Leuconostoc Citreum N21 from Dried Milk Cake"》

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Diff erent superscript letters denote a statistically signifi cant diff erence in EA at P<0.05.The same letters indicate no signifi cant diff erences （P<0.05）

The EA of the EPS is measured by its capacity to maintain a hydrocarbon emulsion in water.An eff ective emulsifi er should have the ability to keep at least 50%of the primal volume of an emulsion for 24 h after formation[29].After 1，7，and 15 days，emulsions of dextran solution（1 mg/m L）and sunfl ower oil were compared for their stability，and the results are presented in Table 1.The dextran produced by strain N21 possessed an EA of 66.7%after 1 h，and a slight decrease to 63.4%was observed at 24 h.The same trend could be observed with locust gum，guar gum，and a purifi ed EPS from Lactobacillus kefi ranofaciens，revealing an EA of 65.46，37.47，and 84.12%，respectively，after 1 h[30].Although the activity decreased slightly after 7 and15 days of storage to 62.73%and 62.72%，respectively，the decrease in emulsion stability was not signifi cant after 24 h.The EPS from Bifi dobacterium longum CCUG 52486 andNCIMB 702205 could maintain emulsifying stability for 7days at a temperature of 25°C with sunfl ower seed oil[31].Compared with other EPSs，the one in this study was a more eff ective emulsifi er.