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Objective To investigate the effects of different brewing conditions on the antioxidant activities and effective components of Taraxacum mongolicum tea soup. Methods The method used a controlled univariate design to study the extraction content of total flavonoids, total polyphenols, total polysaccharides, and total amino acids in dandelion tea under different brewing times, temperatures, tea water ratios, and water quality conditions by ultraviolet-visible spectrophotometry. The antioxidant activities of dandelion tea soup were explored using 2,2-diazine-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) cationic radical, 1,1-diphenyl-2- picrylhydrazyl (DPPH) radical and nitroso scavenging rate, and ferric ion reducing antioxidant power (FRAP) as indicators. The relationships between its antioxidant activities and the content of total flavonoids, total polyphenols, total polysaccharides, and total amino acids in the dandelion tea soup were analyzed. Results When the brewing time was 5 min, the nitroso scavenging activity was the best, expressed as the equivalent concentration of vitamin C (VC) per gram of sample was 0.3938 mg VC/g, which was significantly correlated with the contents of total polyphenols, theanines, and glutamic acids, with correlation coefficients of 0.597, 0.598 and 0.616, respectively; When the brewing temperature was 94 ℃, the iron ion reduction capacity was the strongest, at 0.1784 mg VC/g, significantly correlated with the total polysaccharide content, with a correlation coefficient of 0.529; when the tea water ratio was 1:50 (g:mL), the DPPH radical scavenging activity was the strongest, at 0.2571 mg VC/g, significantly correlated with the contents of total theanines and glutamic acids, with correlation coefficients of 0.483 and 0.497, respectively; when the brewing water was tap water, the ABTS cationic radical scavenging activity was the strongest, at 0.2072 mg VC/g, significantly correlated with the total flavonoids and total polyphenols content, with correlation coefficients of 0.417 and 0.787, respectively. In summary, different brewing conditions affected the antioxidant activities and effective components of dandelion. The antioxidant activities of Taraxacum mongolicum tea were the results of the combined effects of various active compounds, including flavonoids, polyphenols, polysaccharides and amino acids. Conclusion To ensure the optimal antioxidant effects of Taraxacum mongolicum tea, when primarily considering antioxidant activities, it is recommended that the best brewing conditions are: A brewing time of 5 min, a brewing temperature of 94 ℃, a tea-to-water ratio of 1:50 (g:mL), and using tap water for brewing.
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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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