Structure Characterization of Polysaccharide from Chinese Yam (<i>Dioscorea opposite</i> Thunb.) and Its Growth-Promoting Effects on <i>Streptococcus thermophilus</i>
To clarify the mechanisms underlying the growth-promoting effects of yam polysaccharide on <i>Streptococcus thermophilus (S. thermophilus)</i>, the yam polysaccharide was extracted using a deep eutectic solvents (DESs) method and separated into four fractions by DEAE-cellulose 52. These...
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| Auteurs principaux: | , , , , |
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| Format: | article |
| Langue: | EN |
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MDPI AG
2021
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| Accès en ligne: | https://doaj.org/article/e301d7486ca54bf3ba4d25ec9cf32b1c |
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| Résumé: | To clarify the mechanisms underlying the growth-promoting effects of yam polysaccharide on <i>Streptococcus thermophilus (S. thermophilus)</i>, the yam polysaccharide was extracted using a deep eutectic solvents (DESs) method and separated into four fractions by DEAE-cellulose 52. These fractions were used as the alternative carbon source to substitute lactose to compare their growth-promoting effects on <i>S. thermophilus</i>. Furthermore, their molecular weight, monosaccharide and functional groups’ composition, microscopic forms and other basic structure characterizations were analyzed. The results showed that all the fractions could significantly promote <i>S. thermophilus</i> growth, and fractions exhibited significantly different growth-promoting effects, whose viable count increased by 6.14, 6.03, 11.48 and 11.29%, respectively, relative to those in the M17 broth medium. Structure-activity relationship analysis revealed that the high growth-promoting activity of yam polysaccharide might be more dependent on the higher molecular weight, the higher galacturonic acid content and its complex spatial configuration, and the existence of β-glycosides would make the yam polysaccharide have a better growth-promoting effect on <i>S. thermophilus</i>. |
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