To develop fermented purple sweet potato clear juice using Bacillus natto.
Single-factor experiments and orthogonal tests were conducted to investigate the effects of solid-liquid ratio, isomalt-oligosaccharide addition, inoculation amount, fermentation temperature and fermentation time on the pH, soluble solid content and sensory score of the fermented product.
The optimal fermentation conditions were determined as follows: solid-liquid ratio of 1:4 (g:mL), isomalt-oligosaccharide addition of 10%, inoculation amount of 4%, fermentation temperature of 39 ℃, and fermentation time of 8 h. Under these conditions, the flavor of purple sweet potato clear juice was well integrated with the fermentation flavor, with the main odor components being nitrogen-containing compounds and sulfides.
The beverage developed in this study can enhance the absorption of purple sweet potato nutrients in the human intestine and has multi-level health benefits. The production process minimizes the use of food additives, meeting consumer demand for healthy functional foods. This study also provides a reference for improving the added value of purple sweet potatoes and enriching the variety of probiotic plant-based beverages.
| 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 |