|Budget Amount *help
¥2,600,000 (Direct Cost : ¥2,600,000)
Fiscal Year 1998 : ¥500,000 (Direct Cost : ¥500,000)
Fiscal Year 1997 : ¥2,100,000 (Direct Cost : ¥2,100,000)
The volatile flavor of fermented fish sauces has been investigated, and a full understanding of it is necessary to faciliate manufacture of new types of umami soup and related products. Their utility as a masking taste may be high and they may be made to take root in Japan widely. It must be pointed out, however, that one of the chief difficulties in using fish sauce is its peculiar smell which is unfamiliar to the perception of most Japanese. This trend has in turn initiated studies of fish sauce to better improve its flavor.
Various fish sauces commercially available were analyzed using the purge-and-trap method. As for aldehydes, the abundance of 2-methylpropanal, 2- and 3-methylbutanal was substantially higher, and 2-furanmethanol seemed to be a specific compound largely formed in salted squid sauce.
The addition of Eurotium herbariorum to shaking squid sauce produced a good result in flavor. The effect of salt concentration in cultivation of the fungus on the ability to improve the
flavor of squid sauce was investigated. The higher the concentrations of salt for cultivation were, the lower the abundance of aldehydes was and the more desirable the aroma developed organoleptically. Aldehydes were easily converted into their corresponding alcohols and acids.
Though the amounts of occurrence of aldehydes were very small in squid sauce which had not been heated, they increased rapidly when heated in more than 50ﾟC.This suggests that the existence of the material which controls an occurrence of aldehydes.
The results of this research will contribute to the development of the new food processing technology using microorganisms and the effective use of the waste of fish.