화학공학소재연구정보센터
Journal of Food Engineering, Vol.216, 90-97, 2018
Characteristics of pectin from black cherry tomato waste modified by dynamic high-pressure microfluidization
The present work aimed at better understanding of the effects of dynamic high pressure micro fluidization (DHPM) on physicochemical properties and rheological property of pectin extracted from black-cherry tomato pomace. It was found that DHPM effectively increased the average particle size of pectin, as the result of foamed filiform parts formation in micro-structure. Galacturonic acid with esterified structures were observed according the nuclear magnetic resonance (NMR) spectroscopy and relatively independent of the pressure of DHPM, while degree of esterification (DE) was slightly increased when the pressure was higher than 40 MPa. Solutions of pectin treated by DHPM were consistent with the power's law model at low shear rate (shear rate < 1 s(-1)) and sweep frequency (f < 1 Hz). DHPM treatment significantly decreased (p < 0.05) the apparent viscosity (eta) and consistency index (K) of pectin. Moreover, phase angle (delta) of pectin treated by DHPM decreased, that indicated better fluidity and higher consistency for the solutions. Additionally, effects of DHPM at 120 MPa were noticed, DPPM resulted in particle size decreasing and there were no significant changes (p < 0.05) of eta. However, flow behavior index (n) and tan delta indicated that character of pectin solutions changed compared to pectin without DHPM treatment. (C) 2017 Elsevier Ltd. All rights reserved: