Method for extracting erythrothioneine from domestic fungi by using ultrasonic-microwave assisted combined vacuum freeze drying
A vacuum freeze-drying and microwave-assisted technology, applied in organic chemistry and other fields, can solve the problems of low impurity removal rate, low extraction rate, high energy consumption, etc., and achieve the effect of high extraction rate, simple process and short time consumption
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Embodiment 1
[0033] Embodiment 1: vacuum freeze-dried Pleurotus eryngii
[0034] Cut fresh and clean Pleurotus eryngii crosswise into thin slices with a thickness of 0.5cm, freeze-dry at -70°C, and then vacuum-dry for 24 hours; crush the dried Pleurotus eryngii and pass through a 70-mesh sieve to obtain dry powder of Pleurotus eryngii, -70 ℃ sealed storage.
Embodiment 2
[0036] The dried powder of Pleurotus eryngii obtained in Example 1 is added according to the ratio of material to liquid 1:20, 1:30, 1:40, 1:50, and 1:60 of ethanol with a volume percentage concentration of 70%. Microwave treatment at 70°C for 4 minutes, and then ultrasonic treatment at 500W for 5 minutes. The extract was centrifuged, and the supernatant was constant volume with 70% ethanol by volume, and the extraction amount of ergothioneine was detected to be the highest when the solid-liquid ratio was 1:50, reaching 2.46 mg / mL.
[0037] The present embodiment has investigated the influence of solid-liquid ratio on the extraction amount of ergothioneine, as figure 1 shown.
Embodiment 3
[0039] The Pleurotus eryngii dry powder obtained in Example 1 is added respectively according to the solid-liquid ratio 1:50 of volume percentage concentration 40%, 55%, 70%, 85%, 100% ethanol, first in microwave power 400W, microwave temperature 70 ℃ Under the condition of microwave treatment for 4 minutes, and then ultrasonic treatment under the condition of ultrasonic power 500W for 5 minutes. The extract is centrifuged, and the supernatant is taken to be 40%, 55%, 70%, 85%, and 100% ethanol to be measured with the volume percentage concentration respectively, and the extraction amount of detection ergothioneine is at 55% ethanol volume percentage concentration. % was the highest, reaching 2.93mg / mL.
[0040] The present embodiment has investigated the impact of ethanol ratio on the extraction amount of ergothioneine, as figure 2 shown.
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