TY - JOUR
T1 - Comparison of Dialysis and Metal Precipitation Effects on Apple Pectins
AU - HWANG, J.
AU - ROSHDY, T. H.
AU - KONTOMINAS, M.
AU - KOKINI, J. L.
PY - 1992/9
Y1 - 1992/9
N2 - Metal precipitation as a purification method for pectins was investigated for effects on chemical composition (anhydrogalacturonic acid, methoxyl and degree of esterification and neutral sugars), and molecular properties (molecular weight and intrinsic viscosity) in comparison with dialysis. The Cu(II) ions were used to separate pectins from non‐uronide components, and then the Cu(II) ions complexed with pectins were removed by 1% acid alcohol or EDTA treatment. The contaminants were removed more effectively by metal precipitation than dialysis. Acid alcohol did not affect degree of esterification of pectins, whereas it significantly cleaved the neutral sugar side chains. Pectins treated with acid alcohol had lower molecular weights, but larger intrinsic viscosities indicating their more linear nature compared to pectins treated with EDTA.
AB - Metal precipitation as a purification method for pectins was investigated for effects on chemical composition (anhydrogalacturonic acid, methoxyl and degree of esterification and neutral sugars), and molecular properties (molecular weight and intrinsic viscosity) in comparison with dialysis. The Cu(II) ions were used to separate pectins from non‐uronide components, and then the Cu(II) ions complexed with pectins were removed by 1% acid alcohol or EDTA treatment. The contaminants were removed more effectively by metal precipitation than dialysis. Acid alcohol did not affect degree of esterification of pectins, whereas it significantly cleaved the neutral sugar side chains. Pectins treated with acid alcohol had lower molecular weights, but larger intrinsic viscosities indicating their more linear nature compared to pectins treated with EDTA.
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U2 - 10.1111/j.1365-2621.1992.tb11293.x
DO - 10.1111/j.1365-2621.1992.tb11293.x
M3 - Article
AN - SCOPUS:84987265507
SN - 0022-1147
VL - 57
SP - 1180
EP - 1184
JO - Journal of Food Science
JF - Journal of Food Science
IS - 5
ER -