Method for preparing polygonum paleaceum dry extract by hot water extraction and ethanol precipitation and/or its purification part

[0013] Firstly, the boiled and alcohol-immersed dry extract of D. japonicus is prepared through the following steps:

[0014] (1) Place 130g of Herba Sinensis and 1850ml of pure water in a round-bottomed flask, place in boiling water for reflux in a water bath for 90min, then suction filter to obtain filtrate and residue respectively;

[0015] (2) After repeating step (1) 2 to 3 times, mix the obtained filtrate, add alcohol with a volume of 98% of the mixed filtrate, place it overnight at 8° C., and then suction filter to obtain an alcohol-containing filtrate;

[0016] (3) The alcohol-containing filtrate was concentrated under reduced pressure at 85° C. to 15 ml of the boiled and alcohol-precipitated extract of Dracaena japonicus.

[0017] Repeat steps (1) to (3) to prepare 50ml of Boiled and alcohol-precipitated extract of Dracaena japonicus;

[0018] (4) Concentrate the prepared 50ml of D. pratense in water to 0.4 times the volume, then distill off the ethanol to obtain the...

[0021] Firstly, the boiled and alcohol-immersed dry extract of D. japonicus is prepared through the following steps:

[0022] (1) Place 130g of Herba Sinensis and 1300ml of pure water in a round-bottomed flask, reflux in boiling water for 60min, and filter with suction to obtain filtrate and residue respectively;

[0023] (2) After repeating step (1) 2 to 3 times, mix the obtained filtrate, then add 97% alcohol equal to the volume of the mixed filtrate, place it overnight at 4°C and then suction filter to obtain an alcohol-containing filtrate;

[0024] (3) Concentrate the alcohol-containing filtrate under reduced pressure at 75°C to 15ml of the boiled and alcohol-precipitated extract of Dracaena japonicus. Repeat steps (1) to (3) to prepare 50ml of Boiled and alcohol-precipitated extract of Dracaena japonicus;

[0025] (4) Concentrate the prepared 50ml of D. pratense extract by boiling and ethanol precipitation to 0.3 times the volume, then evaporate the ethanol to obtain the...

[0028] Firstly, the boiled and alcohol-immersed dry extract of D. japonicus is prepared through the following steps:

[0029] (1) Put 130g of dried blood and 1040ml of pure water into a round-bottomed flask, reflux in boiling water for 30 minutes, and filter with suction to obtain filtrate and residue respectively; repeat 2 to 3 times.

[0030] (2) After repeating step (1) 2 to 3 times, mix the obtained filtrate, then add 95% alcohol equal to the volume of the mixed filtrate, place it overnight at 0°C and then suction filter to obtain an alcohol-containing filtrate;

[0031] (3) Concentrate the alcohol-containing filtrate under reduced pressure at 70° C. to 15 ml of the boiled and alcohol-precipitated extract of Dracaena japonicus. Repeat steps (1) to (3) to prepare 50ml of Boiled and alcohol-precipitated extract of Dracaena japonicus;

[0032] (4) Concentrate the prepared 50ml of D. pratense in water to 0.1 times the volume, then distill off the ethanol to obtain the residue...