Roselle red pigment and preparation method
A technology of roselle red and red pigment, which is applied in the field of red pigment, can solve problems such as easy to induce poisoning, harmful to human body, cannot be used more or not used as much as possible, and achieves the effect of low production cost, bright color and simple production process
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Embodiment 1
[0016] Wash and dry 1000 grams of roselle calyx into a container, add 20 times the amount of clear water, heat it in a water bath to boiling, and filter it after stirring continuously for 35 minutes; filter the filter cake with 10 double the amount of clear water, leached three times according to the above method and then filtered; combined the first and second filtrates obtained, heated to 65°C in a water bath, and concentrated under reduced pressure to gradually concentrate the filtrate to a solid content of 40%. Roselle red pigment extract; the concentrated roselle red pigment extract is mixed with twice the concentration of 95% ethanol, slowly stirred for 1 hour for degumming, left to stand for 6 hours after degumming, and the filtrate is collected after filtration; The filter cake was washed four times with 50% ethanol, filtered and dried, and dried at 60°C to make roselle pectin; the filtrates were combined, heated in a water bath, and the ethanol was recovered by distill...
Embodiment 2
[0018] Wash and dry 1100 grams of roselle calyx into a container, add 20 times the amount of water, heat it in a water bath to boiling, and filter it after stirring continuously for 40 minutes; filter the filter cake with 10 Double the amount of clear water, leached three times according to the above method and then filtered; combined the first and second filtrates obtained, heated to 70°C in a water bath, and concentrated under reduced pressure to gradually concentrate the filtrate to a solid content of 35%. Roselle red pigment extract; the concentrated roselle red pigment extract is mixed with twice the concentration of 95% ethanol, slowly stirred for 1 hour for degumming, left standing for 5 hours after degumming, and the filtrate is collected after filtration; The filter cake was washed four times with 50% ethanol, filtered and dried, and dried at 60°C to make roselle pectin; the filtrates were combined, heated in a water bath, and the ethanol was recovered by distillation ...
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