Fermentation profile, cholesterol-reducing properties and chemopreventive potential of β-glucans from Levilactobacillus brevis and Pediococcus claussenii - a comparative study with β-glucans from different sources

• Published in: Food & function Vol. 12; no. 21; pp. 10615 - 10631
• Main Authors: Schlörmann, W, Bockwoldt, J A, Mayr, M F, Lorkowski, S, Dawczynski, C, Rohn, S, Ehrmann, M A, Glei, M
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 01.11.2021
• Subjects: Abundance; Adenoma; Ammonia; Apoptosis; Bacteria; Barley; beta-Glucans - chemistry; beta-Glucans - metabolism; beta-Glucans - pharmacology; Bile acids; Caspase-3; Cell Line, Tumor; Cell Survival - drug effects; Cholesterol; Cholesterol - chemistry; Colon; Colorectal Neoplasms - drug therapy; Comparative studies; Fatty acids; Fermentation; Genotoxicity; Glucan; Glucans; Humans; Lactic acid; Lactic acid bacteria; Lactobacillaceae - metabolism; Pediococcus; Pediococcus - metabolism; Physiological effects; Relative abundance; Yeast; Yeasts; β-Glucan
• ISSN: 2042-6496; 2042-650X
• DOI: 10.1039/d1fo02175c

The aim of the present study was to investigate whether β-glucans obtained from the lactic acid bacteria (LAB) and exhibit similar physiological effects such as cholesterol-binding capacity (CBC) as the structurally different β-glucans from oat, barley, and yeast as well as curdlan. After fermentation, fermentation supernatants (FSs) and/or -pellets (FPs) were analyzed regarding the concentrations of short-chain fatty acids (SCFAs), ammonia, bile acids, the relative abundance of bacterial taxa and chemopreventive effects (growth inhibition, apoptosis, genotoxicity) in LT97 colon adenoma cells. Compared to other glucans, the highest CBC was determined for oat β-glucan (65.9 ± 8.8 mg g , < 0.05). Concentrations of SCFA were increased in FSs of all β-glucans (up to 2.7-fold). The lowest concentrations of ammonia (down to 0.8 ± 0.3 mmol L ) and bile acids (2.5-5.2 μg mL ) were detected in FSs of the β-glucans from oat, barley, yeast, and curdlan. The various β-glucans differentially modulated the relative abundance of bacteria families and reduced the Firmicutes/Bacteroidetes ratio. Treatment of LT97 cells with the FSs led to a significant dose-dependent growth reduction and increase in caspase-3 activity without exhibiting genotoxic effects. Though the different β-glucans show different fermentation profiles as well as cholesterol- and bile acid-reducing properties, they exhibit comparable chemopreventive effects.