title: Non-Newtonian Characteristics of Gochujang and Chogochujang at Different Temperatures.
abstract: This study was conducted to determine the rheological properties of gochujang and chogochujang at different temperatures (25, 35, and 45°C). Rheological properties of the samples were determined using a rotational rheometer at a shear range of 1 to 40 s-1. Gochujang and chogochujang were found to be non-Newtonian fluids according to the Herschel-Bulkley model. Yield stress and consistency coefficient of gochujang at different temperatures were higher than those of chogochujang, whereas the opposite was observed for flow behavior index. Moreover, all rheological properties of gochujang and chogochujang decreased with increasing temperature. The consistency coefficient was related to temperature using an Arrhenius-type relationship. Gochujang (14.48 kJ/mol) had slightly higher activation energy than chogochujang (14.03 kJ/mol).
authors.affiliation: Department of Food Engineering, Daegu University, Gyeongbuk 38453, Korea.
authors.forename: Ji Eun
authors.initials: JE
authors.lastname: Choi
authors.affiliation: Department of Food Engineering, Daegu University, Gyeongbuk 38453, Korea.
authors.forename: Jun Ho
authors.initials: JH
authors.lastname: Lee
keywords: Herschel-Bulkley model; activation energy; chogochujang; gochujang; non-Newtonian