The purpose of this study is to examine possible correlation between sensory properties and quality when
varying the brewing time of expresso, which is widely regarded as the most basic coffee type. To this end, this study
selected the two most comm...
The purpose of this study is to examine possible correlation between sensory properties and quality when
varying the brewing time of expresso, which is widely regarded as the most basic coffee type. To this end, this study
selected the two most commonly used coffee bean types, which are Brazilian coffee bean and Columbian coffee bean.
Specifically, pH, Brix, salinity, viscosity, solid content and chromaticity were measured for each brewing time of espresso
with the aforementioned two coffee bean types. As a result, pH and Brix of the expresso brewed with Brazilian coffee
bean has significantly increased as the brewing time has decreased. The salinity and solid content of espresso were found
to be high, whereas lungo was found to have a high degree of viscosity. In the case of chromaticity, Lungo had the highest
value at L. pH of the espresso menu brewed with Columbian coffee bean was not found to have any significant difference.
However, Brix, salinity and viscosity have significantly decreased as the brewing time has decreased. As for chromaticity,
lungo had the highest value for all of L, a and b. In regard to the electronic tongue analysis, ristretto had the highest value
in sour taste, salty taste, savory taste and sweet taste for the espresso menu brewed with Brazilian coffee bean, whereas
lungo had the highest value in bitter taste. As for the espresso menu brewed with Columbian coffee bean, ristretto had the
highest value in sour taste, salty taste and sweet taste, whereas lungo had the highest value in savory taste and bitter taste.
Therefore, it was concluded that the brewing time of expresso had a profound impact on the sensory properties and it
also influenced pH, Brix, salinity, viscosity, solid content and chromaticity. Moreover, it was also found that the taste and
texture of coffee might vary depending on the origin of coffee bean