The aim of this study was to compare the use of handmade and instant bonito-kelp stocks in Japanese-style dishes. Japanese dishes prepared with handmade or instant bonito-kelp stocks could be discriminated from one another (p < 0.01). The handmade stock was rated as preferable in liquid-type dishes, while the instant stock was preferable in solid-type dishes (p < 0.01). Our analysis showed that handmade and instant stocks had significantly different compositions of taste constituents (p < 0.01). For example, the concentrations of aspartic acid and histidine were both higher in the handmade stock than in the instant stock. Instant stocks had markedly higher concentrations of glutamic acid and 5′-inosinic acid as compared with handmade stocks. In addition, the total number of free amino acids and nucleic acid compounds differed between the handmade and instant stocks: handmade stock had many types of components, whereas instant stock had only a few types. These findings imply that the composition of taste components is simpler in instant stocks than in handmade stocks.
Read full abstract