Method for extracting natural haematochrome from larch bark
A technology of natural red pigment and pine bark, applied in natural dyes, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve problems such as unfavorable industrialization of larch bark red pigment, pollution of red pigment products, poor extraction effect, etc. , to achieve the effect of easy control of operating parameters, good separation and purification effect, and high extraction efficiency
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Embodiment 1
[0029] Embodiment 1 extracts natural red pigment from larch bark
[0030] Including the following steps:
[0031] (1) Crush 20 g of larch bark into particles with a particle size of 20 to 80 mesh, put it into 700 mL of 60% acetone solution, place it under the condition of 35 ° C for 60 min, and ultrasonic frequency is 20 KHz to obtain the bark extract stock solution.
[0032] (2) Centrifuge at a speed of 4000r / min for 5 minutes while it is hot, and the centrifugation time is 5 minutes, and vacuum filter the supernatant under the condition of vacuum degree -0.098MPa to obtain the filtrate.
[0033] (3) Dry the filtrate in an oven at 50°C for 24 hours to obtain the crude product. Take an appropriate amount of crude product and prepare 1.0 L of a solution with a concentration of 10.0 mg / ml in 50% ethanol solution, filter through a 0.45 μm microfiltration membrane, and then separate through an ultrafiltration membrane with a molecular weight cut-off of 10 kD to obtain a retentate...
Embodiment 2
[0035] Embodiment 2 extracts natural red pigment from larch bark
[0036] (1) Crush 20 g of larch bark into particles with a particle size of 30-40 mesh, put it into 1000 mL of 70% acetone solution, place it under the condition of 45 ° C for 90 min, and ultrasonic frequency is 40 KHz to obtain the bark extract stock solution.
[0037] (2) Centrifuge at a speed of 4000r / min for 5 minutes while it is hot, and the centrifugation time is 5 minutes, vacuum filter the supernatant under the condition of vacuum degree -0.098MPa to obtain the filtrate;
[0038] (3) Dry the filtrate in an oven at 50°C for 36 hours to obtain the crude product. The crude product was prepared with 70% ethanol solution to 1.0 L of a solution with a concentration of 2.0 mg / ml, filtered through a 0.45 μm microfiltration membrane, and then separated by an ultrafiltration membrane with a molecular weight cut-off of 20 kD to obtain a retentate.
[0039] (4) Concentrate the retentate under reduced pressure with ...
Embodiment 3
[0040] Embodiment 3 extracts natural red pigment from larch bark
[0041] According to the same operation as in Example 2, ethanol was used as the extraction solvent. The specific steps are:
[0042] (1) Crush 20 g of larch bark into particles with a particle size of 30-40 mesh, put it into 1000 mL of 70% ethanol solution, place it under the condition of 45 ° C for 90 min, and the ultrasonic frequency is 40 KHz to obtain the bark extract stock solution.
[0043] (2) Centrifuge at a speed of 4000r / min for 5 minutes while it is hot, and the centrifugation time is 5 minutes, vacuum filter the supernatant under the condition of vacuum degree -0.098MPa to obtain the filtrate;
[0044] (3) Dry the filtrate in an oven at 50°C for 36 hours to obtain the crude product. The crude product was prepared with 70% ethanol solution to 1.0 L of a solution with a concentration of 2.0 mg / ml, filtered through a 0.45 μm microfiltration membrane, and then separated by an ultrafiltration membrane ...
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