The influence of four drying methods on nonvolatile taste components of White Hypsizygus marmoreus

The influence of four drying methods on nonvolatile taste components of White Hypsizygus marmoreus (WHM) was studied. The soluble sugar, free amino acids, organic acids, and flavor nucleotides of WHM were determined and compared by HPLC after hot air drying, vacuum drying (VD), microwave-vacuum drying (MVD), and vacuum freeze-drying (FD). Equivalent umami concentration (EUC) was used to evaluate the umami taste of WHM. The results showed that the four drying methods had different influence on the soluble sugar, free amino acids, organic acids, and flavor nucleotides. Soluble sugar retention after MVD was the highest (192.61 mg/g), but the EUC (147.6 g/100 g) was lower. The content of essential amino acids (22.83 mg/g), flavor amino acids (22.05 mg/g), and total amino acids (48.95 mg/g) after VD was the highest, but the EUC was the lowest; FD can reduce the loss of the total flavor nucleotides to the minimum, compared with the other three drying methods. FD got the highest retention rate of the total organic acids especially succinic acid, and the influence on amino acids was almost the same with VD. Considering the maximum retention of nonvolatile taste components, FD is the most optimal drying method. Different drying methods have their respective advantages, and this study provided reference for the processing of the WHM.