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To overcome the restricted bioactivity of konjac glucomannan (KGM) caused by its high molecular weight, KGM-degrading bacteria were isolated from konjac cultivation soil, diseased konjac tubers, and liquor fermentation systems. The probiotic potential of these strains was assessed based on acid and bile salt tolerance, resistance to simulated gastrointestinal fluids, and safety evaluations. It was found that all four isolated strains exhibited excellent KGM-degrading capability, along with high tolerance to acidic conditions, bile salts, and simulated digestive fluids, a safe profile, antibiotic sensitivity, antibacterial activity, and strong adhesion capability to human colon cancer Caco-2 cells. Through morphological and 16S rDNA analyses, strain JQ4 was identified as Bacillus halotolerans, whereas strains JZ6 and JZ8 were classified as Bacillus paralicheniforms, and RF8 was confirmed as Bacillus licheniforms. Notably, Bacillus licheniformis RF8 exhibited β-mannanase activity of 49.92±0.06 U/mL, demonstrated survival rates of 96.57%±0.27% and 82.22%±0.48% after 3 h in simulated gastric fluid (pH2.0) and 6 h in simulated intestinal fluid (pH8.0), respectively, and showed a high adhesion capability to human colon cancer Caco-2 cells of 362.76±4.31 CFU/cell. In conclusion, four Bacillus strains with both efficient KGM-degrading capacity and promising probiotic characteristics were successfully obtained. These findings provide valuable microbial resources and a theoretical foundation for the development of functional oligosaccharides and novel probiotic formulations.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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