AUTHOR=Sun Yongjin , Guan Yuan , Khoo Hock Eng , Li Xia 

TITLE=In vitro Assessment of Chemical and Pre-biotic Properties of Carboxymethylated Polysaccharides From Passiflora edulis Peel, Xylan, and Citrus Pectin

JOURNAL=Frontiers in Nutrition

VOLUME=8

YEAR=2021

URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2021.778563

DOI=10.3389/fnut.2021.778563

ISSN=2296-861X

ABSTRACT=<p>This study aimed to determine the carboxymethylation effect of crude water-soluble polysaccharides of <italic>Passiflora edulis</italic> peel (WPEP), xylan (XY), and citrus pectin (CP). Their chemical and pre-biotic properties were also determined. The polysaccharides were carboxymethylated by reacting with chloroacetic acid and sodium hydroxide. The carboxymethylated and non-carboxymethylated polysaccharides were also used as pre-biotics to study the growth pattern of selected intestinal microflora. These polysaccharides substituted the glucose solution in culture media for culturing <italic>Lactobacillus brevis</italic> GIM1.773, <italic>Lactobacillus plantarum</italic> GIM1.19, <italic>Lactobacillus delbrueckii</italic> subsp. <italic>bulgaricus</italic> GIM1.155, and <italic>Streptococcus thermophilus</italic> GIM1.540. The results showed that the carboxymethylated polysaccharides c-XY, c-CP, and c-WPEP, had substitution degrees of 0.682, 0.437, and 0.439, respectively. The polysaccharides demonstrated resistance to digestion in the simulated human digestive models. The resistance to digestion was enhanced by carboxymethylation, especially the carboxymethylated CP and WPEP. The results also showed that the pre-biotic activities of the polysaccharides increased after carboxymethylation. The c-XY had a better pre-biotic effect than XY and the other carbohydrate samples. The findings suggested that carboxymethylated polysaccharides may be developed into novel pre-biotics and nutraceuticals that could promote growth of the probiotic strains.</p>