Galacturonic acid content

Citrus pectin ( Polygalacturonic Acid Methyl Ester from Citrus Fruits, Grade I ) was obtained from the Sigma Chemical Company. It had a galacturonic acid content of 89% and a degree of esterification of 57. Separate aqueous solutions of citrus pectin were freeze-dried and air-dried in deionized water. These samples were replicated with 9.8A Pt/C and backed with 148A of carbon. The replicas for these samples were picked up without a carbon support film (38). 

Hourdet, D., and Muller, G. (1991). Solution properties of pectin polysaccharides II. Conformation and molecular size of high galacturonic acid content isolated pectin chains. Carbohydr. Polym. 16 113-135. 

Galacturonic Acid Content (g CalA/100 g of Initial Fresh Sample) Analyzed in the Different Pectic Fractions of Fresh and Dried Apple... 

The molecular weight (Mw), degree of esterification (DE), and content of anhydrous galacturonic acid (AG) of the citrus pectin are shown in Table 1. The molecular weight was estimated by intrinsic viscometry (calibrated against known pectin products), and the degree of methoxylation and the galacturonic acid content by titration. 

D Addosio et al. (2005) extracted and characterized the pectin from passion fruit pomace in different maturation stages and using different acid, such as, hydrochloric acid, phosphoric acid and a mixture of these two acids. The pectin with highest esterification degree and galacturonic acid content was obtained when hydrochloric acid was used during the extraction. 

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