Subcritical water was used to extract pectin from citrus peel and apple pomace, in which the effect of
extraction temperature on properties of the pectins was investigated. The maximum yield of citrus peel
pectin (CPP) and apple pomace pectin (APP) were 21.95% and 16.68% respectively. No significant differences
were found in FTIR spectra of CPP and APP. According to DSC analysis, the endothermic property
of pectin was affected by extraction temperature while the exothermic property of pectin was only
affected by its constituents and raw material. The pectin solutions exhibited shear-thinning properties
and tended to be more elastic (G0 > G00) with frequency increase according to rheological analysis, which
was also reflected in hydrogel analysis. Moreover, both CPP and APP scavenged more than 60% DPPH
radical and 80% ABTS radical in vitro and the highest proliferation inhibition rates of colon cancer cell HT-
29 by CPP and APP were 76.45% and 45.23% respectively.