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To isolate and screen lactic acid bacteria with antioxidant capacity from Chaenomeles speciosa.
The probiotic properties and antioxidant capacity of Chaenomeles speciosa were evaluated by screening, isolating and identifying the lactic acid bacteria strains in it.
The 4 dominant strains, namely MG3,MG9, MG13 and MG21, were identified as Lactiplantibacillus plantarum. Strain MG13 exhibited excellent probiotic performance and strong antioxidant activity. The 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging rates of its fermentation supernatant and bacterial suspension reached 90.93% and 59.30%, respectively; the hydroxyl radical scavenging rates were 93.47% and 49.19%; and the superoxide anion radical scavenging rates were 91.00% and 72.25%.When MG13 was applied to ferment Chaenomeles speciosa juice, the antioxidant activity of the juice was significantly improved. Compared with unfermented juice, the DPPH and 2,2’-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid)radical scavenging rates of fermented juice increased significantly to 78.91% and 87.02%, respectively. The content of flavonoids and polyphenols in fermented juice rose by 55.44% and 30.25%, which effectively enhanced the functional properties of Chaenomeles speciosa juice.
Fermentation with strain MG13 significantly optimizes the quality of Chaenomeles speciosa juice. This study provides theoretical support and high-quality strain resources for the microbial fermentation and utilization of medicinal and edible plant materials.
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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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