Improvement method for preparing canthaxanthin
A kind of technology of canthaxanthin and carotene, applied in the field of improvement of preparation of canthaxanthin, can solve problems such as inconvenient operation
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Embodiment 1
[0030] Suspend 25.0g (0.0466mol) of β-carotene in 1000mL of chloroform, and mix 200.0g (1.9mol) of sodium chlorate and 0.7g of sodium iodide in 1000mL of water. Put it into a three-necked flask with an inner volume of 3000 mL, and add 4 mL of 2% hydrogen peroxide at one time to the resulting mixture at 15° C. under vigorous stirring. 1 mL of acetic acid was added, after which the temperature of the reaction mixture was raised to 25°C, and the resulting mixture was stirred at room temperature for 180 minutes. At this point, β-carotene disappeared and the pH of the reaction mixture was 5.0. The resulting reaction mixture was allowed to stand until separation into two phases, aqueous and organic. The organic phase was collected and washed successively with 1000 mL of water, 500 mL of 5% aqueous sodium thiosulfate and another 1000 mL of water. The solvent was removed under reduced pressure to give 27.5 g of crude product. HPLC analysis indicated that the crude product contained...
Embodiment 2
[0033] Suspend 25.0g (0.0466mol) of β-carotene in 1000mL of dichloromethane, dissolve 100.0g of sodium chlorate and 100.0g of sodium bromate in 1000mL of aqueous solution, mix them with 0.8g of potassium iodide, and in a nitrogen atmosphere The mixture was added to a three-necked flask with an inner volume of 3000 mL, and 4 mL of 2% hydrogen peroxide was added to the resulting mixture at 15° C. at one time under vigorous stirring. 1 mL of acetic acid was added, after which the temperature of the reaction mixture was raised to 25°C, and the resulting mixture was stirred at room temperature for 180 minutes. At this point, β-carotene disappeared and the pH of the reaction mixture was 5.0. The resulting reaction mixture was allowed to stand until separation into two phases, aqueous and organic. The organic phase was collected and washed successively with 1000 mL of water, 500 mL of 5% aqueous sodium thiosulfate and another 1000 mL of water. The solvent was removed under reduced ...
Embodiment 3
[0036]Suspend 25.0g (0.0466mol) of β-carotene in 1000mL of dichloromethane, dissolve 200.0g of potassium chlorate in 1000mL of aqueous solution, mix it with 1.0g of copper iodide, and add it under a nitrogen atmosphere with an inner volume of 3000mL In a three-necked flask, under vigorous stirring, 4 mL of 2% hydrogen peroxide was added at one time to the resulting mixture at 15°C. Further 1 mL of acetic acid was added, after which the temperature of the reaction mixture was raised to 25°C, and the resulting mixture was stirred at room temperature for 180 minutes. At this point, β-carotene disappeared and the pH of the reaction mixture was 5.0. The resulting reaction mixture was allowed to stand until separation into two phases, aqueous and organic. The organic phase was collected and washed successively with 1000 mL of water, 500 mL of 5% aqueous sodium thiosulfate and another 1000 mL of water. The solvent was removed under reduced pressure to give 27.7 g of crude product. ...
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