The Chemistry of Protopectin: A Critical Review of Historical Data and Recent Developments

摘要: Publisher Summary Present knowledge of pectic substances in plant tissues is based mainly on histological and histochemical studies. This chapter reviews the extensive literature chemistry protopectin. On basis evidence available at present, it not possible to determine unequivocally which several but still hypothetical combinations likely account for solubility characteristics native pectins. It that pectin different plants parts same are chemically bound or physically anchored ways. Additional needed from carefully obtained tissue preparations material properly identified physiologically histologically. appears, present evidence, most explanation relative insolubility protopectin exists as a polygalacturonide hydroxyl groups carbon atoms C4 C5 masked by glycosidic ring formation, carboxyl group C1 either free, esterified with methyl alcohol, araban, galactan, some other polysaccharide. The C2 C3 may be acetyl groups, linked ether-like linkage polysaccharides lignins. degree acetylation factor determining extractability its combination cell-wall constituents.