Method for extracting flavonoid compounds from persimmon leaves
A technology of flavonoids and persimmon leaves, which is applied in the field of extraction of flavonoids, can solve the problems of low content of flavonoids, use of many solvents, and long process time, and achieve simple and easy operation methods, increase extraction content, and eliminate delays. The effect of the tail phenomenon
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Embodiment 1
[0025] The invention provides the following technical scheme: a method for extracting flavonoids from persimmon leaves, comprising the following steps:
[0026] A. Pick fresh persimmon leaves, rinse and dry: use clean water to rinse 3 times repeatedly, and dry in a ventilated place;
[0027] B, the dried persimmon leaves are added into a pulverizer for pulverization, and then passed through a 30-mesh sieve to obtain the pulverized persimmon leaves;
[0028] C, the pulverized persimmon leaves after sieving were added into ethanol, acetic acid, formic acid mixed aqueous solution and carried out ultrasonic extraction 2 times to obtain an extract, wherein the ultrasonic power was 500W, and the ultrasonic time was 5min;
[0029] D, add sodium hydroxide aqueous solution to carry out microwave extraction 2 times in primary extraction liquid, obtain secondary extract;
[0030] E, the secondary extract is subjected to ultrafiltration, followed by vacuum concentration to obtain a conce...
Embodiment 2
[0043] A method for extracting flavonoids from persimmon leaves, comprising the following steps:
[0044] A. Pick fresh persimmon leaves, rinse and dry: use clear water to rinse 5 times repeatedly, and dry in a ventilated place;
[0045] B, the dried persimmon leaves are added into a pulverizer for pulverization, and then passed through a 30-mesh sieve to obtain the pulverized persimmon leaves;
[0046] C, adding the sieved persimmon leaves pulverized matter into ethanol, acetic acid, formic acid mixed aqueous solution and carrying out ultrasonic extraction 2 times to obtain an extract, wherein the ultrasonic power is 800W, and the ultrasonic time is 10min;
[0047] D, add sodium hydroxide aqueous solution to carry out microwave extraction 2 times in primary extraction liquid, obtain secondary extract;
[0048] E, the secondary extract is subjected to ultrafiltration, followed by vacuum concentration to obtain a concentrate; wherein, the vacuum concentration method is as foll...
Embodiment 3
[0061] A method for extracting flavonoids from persimmon leaves, comprising the following steps:
[0062] A. Pick fresh persimmon leaves, rinse and dry: use clean water to rinse 3 times repeatedly, and dry in a ventilated place;
[0063] B, the dried persimmon leaves are added into a pulverizer for pulverization, and then passed through a 30-mesh sieve to obtain the pulverized persimmon leaves;
[0064]C, the pulverized persimmon leaves after sieving were added into ethanol, acetic acid, formic acid mixed aqueous solution and carried out ultrasonic extraction for 2 times to obtain an extract, wherein the ultrasonic power was 550W, and the ultrasonic time was 6min;
[0065] D, add sodium hydroxide aqueous solution to carry out microwave extraction 2 times in primary extraction liquid, obtain secondary extract;
[0066] E, the secondary extract is subjected to ultrafiltration, followed by vacuum concentration to obtain a concentrate; wherein, the vacuum concentration method is ...
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