Fig. 1.

Monosaccharide composition of pectin samples with respect to plant source and extraction pH. HN, harsh nitric acid (pH 1·6); MN, mild nitric acid (pH 2·1); HO, harsh oxalic acid (pH 3·5); MO, mild nitric acid (pH 4·6). Standard deviations are indicated and refer to technical replicates. (A) (Ara + Gal)/Rha ratio of the different pectin samples. (B) GalA/Rha ratio of the different pectin samples. (C) Extractability [(sugar content in pectin sample × extraction yield)/sugar content in peel] of the four main sugars. Average values of the different pectin samples were used.