Changes of Biogenic Amines and Physicochemical Characteristics during the Storage of White Sufu with Open-lid

White sufu was used as raw material and stored at different temperatures (4, 15, 25 and 35℃) for 0, 15, 30, 45 and 60 d. Eight biogenic amines in the samples were detected by high performance liquid chromatography (HPLC). The physicochemical characteristics (pH, water activity, and amino nitrogen) were determined and the correlation among the indexes was analyzed. The results showed that the change trend of total biogenic amine content was basically the same during the whole storage process, which showed a trend of first increasing and then decreasing. The total biogenic amine content ranged from 151.11 to 835.51 mg/kg, which was lower than the limit of the U.S.Food and Drug Administration. The contents of tyramine were up to 118.13 mg/kg at 35℃ until the 15th day, which exceeded the standard. The histamine content of sufu stored at different temperatures was 64.07 mg/kg when the lid was opened. The water activity and pH value of white sufu stored at 4℃ were relatively low. The content of amino nitrogen of white sufu stored at 35℃ was relatively high. The correlation analysis results showed that cadamine had the highest correlation with histamine (r=0.824, P<0.01). The amino nitrogen was positively correlated with phenylethylamine, cadamine and histamine.