A kind of preparation method of litchi riboflavone
A technology of litchi kernel and flavonoids, which is applied in the industrial production of litchi kernel flavonoids and the field of preparation of litchi kernel flavonoids, can solve the problems of no litchi kernel flavonoid preparation method, difficulty in adapting to industrial requirements, and high preparation cost, and achieve high purity and avoid Damage, flavonoid yield increase effect
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Embodiment 1
[0020] A preparation method of lychee kernel flavonoids, comprising the following steps:
[0021] (1) Pretreatment: lychee cores are cleaned, dried naturally, and the final moisture content is controlled below 10%;
[0022] (2) Crush: crush the dried lychee cores and pass through a 60-mesh sieve;
[0023] (3) Alkali treatment: After the lychee core is sieved, add 2 times the weight of water, adjust the pH to 8.5 with NaOH, and soak for 1 hour; % sodium carbonate solution soaked for 12 hours, its weight part is 1 times of litchi core weight part, during soaking, fully stir once every 2 hours, drain water after soaking;
[0024] (4) Extraction: Use ethanol solution with a volume fraction of 60%, adjust the pH to 7.5 with NaOH, and reflux at 50°C for 2 hours; extract the residue twice;
[0025] (5) Purification: Combine the extracts and concentrate in vacuum until most of the ethanol volatilizes; put it into a macroporous resin column by wet method, first elute with water and 1...
Embodiment 2
[0027] A preparation method of lychee kernel flavonoids, comprising the following steps:
[0028] (1) Pretreatment: lychee cores are cleaned, dried naturally, and the final moisture content is controlled below 10%;
[0029] (2) Crush: crush the dried lychee cores and pass through a 60-mesh sieve;
[0030] (3) Alkali treatment: After the lychee core is sieved, add 4 times the weight of water, adjust the pH to 10 with NaOH, and soak for 3 hours; % sodium carbonate solution was soaked for 24 hours, and its weight part was 2 times of litchi core weight part, during soaking, fully stirred once every 4 hours, drained after soaking;
[0031] (4) Extraction: Use an ethanol solution with a volume fraction of 80%, adjust the pH to 8 with NaOH, and reflux at 70°C for 5 hours; extract the residue 3 times;
[0032] (5) Purification: Combine the extracts and concentrate in vacuum until most of the ethanol volatilizes; put it into a macroporous resin column by wet method, first elute with ...
Embodiment 3
[0034] A preparation method of lychee kernel flavonoids, comprising the following steps:
[0035] (1) Pretreatment: lychee cores are cleaned, dried naturally, and the final moisture content is controlled below 10%;
[0036] (2) Crush: crush the dried lychee cores and pass through a 60-mesh sieve;
[0037] (3) Alkali treatment: After the lychee core is sieved, add 3 times the weight of water, adjust the pH to 9 with NaOH, and soak for 2 hours; % sodium carbonate solution was soaked for 18 hours, and its weight part was 1.5 times of litchi core weight part, during soaking, fully stirred once every 3 hours, drained after soaking;
[0038] (4) Extraction: use ethanol solution with a volume fraction of 70%, adjust the pH to 7.7 with NaOH, reflux at 60°C for 3.5 hours; extract the residue twice;
[0039] (5) Purification: Combine the extracts and concentrate in vacuum until most of the ethanol volatilizes; put it into a macroporous resin column by wet method, first elute with wate...
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