is pectin acidic?
Pectin is a heterogeneous grouping of acidic structural polysaccharides, found in fruit and vegetables which form acid-stable gels. Pectin sources. Pectin ( E440 ) is found in fruit and vegetables (reviewed in [ 1581]) and mainly prepared from 'waste' citrus peel and apple pomace. It makes up between about 2% and 35% of plant cell walls [1680] and is important for plant growth. regulation of ion and water exchange, development and defense.