Prevention method of anthocyanin pigment crystal precipitate
A technology of crystal precipitation and anthocyanin, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve problems such as easy precipitation, and achieve the effect of improving quality and preventing the formation of pigment crystals.
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Embodiment 1
[0034] (1) Extraction of Cabbage Red Pigment The cut red cabbage was soaked in a citric acid solution with a pH of 2.5 to 3.0, allowed to stand overnight and then filtered to obtain a transparent pigment extract (with a color value of about 8).
[0035] After the cabbage red pigment solution is properly diluted with pH=3.0 buffer solution, the absorbance at the wavelength of 532nm (the maximum absorption wavelength of cabbage red pigment) is measured, and the absorbance value is converted into the concentration before dilution (E100%, 1cm, 532nm). This represents the color valence of the cabbage red pigment. The subsequent color values were measured according to this method.
[0036] (2) Preparation of concentrated pigment solution The above-mentioned cabbage red pigment extract was vacuum concentrated to obtain a concentrated pigment solution with a color value of about 1200. Add citric acid, water, and if necessary, caustic soda to the concentrated pigment solution to pre...
Embodiment 2
[0069] Cut 20 kg of red cabbage, add 80.0 L of water, add sulfuric acid to adjust the pH to 2.4, and obtain 77 L of cabbage red pigment extract. The obtained pigment extract was passed through a 2.5 L column filled with nonpolar porous polymer resin at a sedimentation rate of SV=5. After passing through the liquid, the non-polar porous polymer resin adsorbed with the pigment was washed with water, and 5 L of hydrophilic organic solvent (80% ethanol) was passed through the column to dissolve the pigment.
[0070] The resulting eluate was concentrated under reduced pressure at 40° C. to obtain a concentrated pigment solution with a color value of 1200. After the concentrated pigment solution was filtered with filter paper under reduced pressure, it was poured into five 100ml brown bottles (№1~№5), 70.0g in each bottle. In order to keep the pH below 3.0, each bottle №1~№5 was added with Citric acid 2.0g. Taking №1 as the reference substance, 15% sorbitol was added to №2, 15% re...
Embodiment 3
[0075] 70 L of cabbage red pigment extract (pH 2.6, color value 9) was passed through a 2 L column filled with nonpolar porous polymer resin at a sedimentation rate of SV=4. Then wash with 4L of water, then dissolve the pigment with 4.5L of 80% ethanol, and then concentrate the eluate under reduced pressure to obtain 370g of eluate with a color value of 1500. Use filter paper to reduce the pressure and filter the concentrated pigment solution and pour it into three 100ml brown bottles (№1~№3), 55.0g in each bottle. In order to make the pH below 3.0, 2.0 g of citric acid was added, and 20 g of ethanol was added in order to prevent microbial proliferation.
[0076] Add 23g of water to №1, a total of 100g (color value 825). Add sorbitol solution (sorbitol 70%) 20g, water 3g to №2, total 100g. Add 20 g of reduced starch saccharide and 3 g of water to No. 3, totaling 100 g. Put №1~№3 in the freezer (below 8°C) and store them for 3 weeks. After storage, the contents were mixed w...
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