Method for refining gardenia yellow pigment by adopting solvent crystallization
A gardenia yellow pigment and crystallization technology, which is applied in the field of purification and refinement of food coloring, can solve the problems of affecting product color price, high production cost, complicated process, etc., achieves remarkable impurity removal effect, improves color price, and is easy to crystallize Effect
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Embodiment 1
[0027] Take 1.5 kg of gardenia coarse powder, add 15 L of water, heat and extract at 80 ° C for 1.5 hours, centrifuge the extract, add 10 L of water to the residue, heat and extract for 1 hour, centrifuge the extract, combine the extracts and concentrate to obtain 230 g of thick extract, The thick extract is the crude product of gardenia yellow pigment.
[0028] Add 1500ml, 95% ethanol aqueous solution to 230g of the crude gardenia yellow pigment, heat to 60°C to dissolve the crude gardenia yellow pigment, filter to remove insoluble impurities, concentrate the filtrate to about 400ml under reduced pressure, and store it in the refrigerator (2-8 ℃) placed for 6 hours to crystallize, crystals were precipitated, and the crystals were collected by filtration. Take 600ml, 95% ethanol aqueous solution to dissolve the crystals, filter to remove insoluble impurities, concentrate the filtrate to about 250ml under reduced pressure, place it in the refrigerator (2-8°C) for 12 hours to cr...
Embodiment 2
[0030]Take 1.5kg of gardenia coarse powder, add 15L of water, heat and extract at 80°C for 1.5 hours, centrifuge the extract, add 10L of water to the residue, heat and extract for 1 hour, centrifuge the extract, combine the extracts and concentrate them into a thick extract 223g, The thick extract is the crude product of gardenia yellow pigment.
[0031] Add 2000ml of acetone to 223g of crude gardenia yellow pigment, heat to 40°C to dissolve the crude gardenia yellow pigment, filter while hot to remove insoluble impurities, concentrate the filtrate to about 450ml under reduced pressure, and place it at -15°C for 2 hours to crystallize. Crystals were precipitated, and the crystals were collected by filtration. Take 600ml of acetone to dissolve the crystals, heat to dissolve at 40°C, filter while hot to remove insoluble impurities, concentrate the filtrate to about 300ml under reduced pressure, place at -5°C for 2 hours to crystallize, precipitate crystals, and collect crystals ...
Embodiment 3
[0033] Take 1.5 kg of gardenia coarse powder, add 15 L of water, heat and extract for 1.5 hours, centrifuge the extract, add 10 L of water to the residue, heat and extract for 1 hour, centrifuge the extract, combine the extracts and concentrate to obtain 220 g of thick extract. It is the crude product of gardenia yellow pigment.
[0034] Add 1500ml, 90% isopropanol aqueous solution to 220g of crude gardenia yellow pigment, heat to 60°C to dissolve the crude gardenia yellow pigment, filter to remove insoluble impurities, concentrate the filtrate to 500ml under reduced pressure, and place it at -20°C for 3 Hours of crystallization, crystallization. Add crystals to 500ml, 90% isopropanol aqueous solution, heat to dissolve at 60°C, filter to remove insoluble impurities, and concentrate the filtrate to 250ml under reduced pressure to obtain a color value of 288, A 238 / A 440 = 0.15, A 325 / A 440 =0.12 gardenia yellow pigment 12.9g.
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