Absorption bands appearing at 1745 and 1630 cm1 were assigned to the stretching vibrations of ester carbonyl (C]O) groups and carboxyl ions (COO), respectively (Singthong, Ningsanond, Cui, & Goff, 2004). A stronger absorption at 1745 cm1 coupled with a weaker absorption at 1630 cm1 indicated that DF-IPD and DF-IPF are the high methoxyl pectins (DE > 50%). A similar pattern was observed for citrus pectin. However, the intensity of the absorption band at 1745 cm1 of citrus pectin was stronger suggesting the DE of citrus pectin is probably higher than that of DF-IPD and DF-IPF. It was noted that DF-WPD and DF-WPF have similar absorption intensity at the aforementioned two characteristic bands which needs further
confirmation by calculating the DE to predict whether they are high/ low methoxyl pectin
Absorption bands appearing at 1745 and 1630 cm1 were assigned to the stretching vibrations of ester carbonyl (C]O) groups and carboxyl ions (COO), respectively (Singthong, Ningsanond, Cui, & Goff, 2004). A stronger absorption at 1745 cm1 coupled with a weaker absorption at 1630 cm1 indicated that DF-IPD and DF-IPF are the high methoxyl pectins (DE > 50%). A similar pattern was observed for citrus pectin. However, the intensity of the absorption band at 1745 cm1 of citrus pectin was stronger suggesting the DE of citrus pectin is probably higher than that of DF-IPD and DF-IPF. It was noted that DF-WPD and DF-WPF have similar absorption intensity at the aforementioned two characteristic bands which needs furtherconfirmation by calculating the DE to predict whether they are high/ low methoxyl pectin
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