| Physical and Chemical Properties | Chemical blue particles or powder. It is a protein-binding pigment, so it has the same properties as protein, and the isoelectric point pH is 3.4. Soluble in water, insoluble in alcohol and grease. Unstable to heat, light, and acid. Stable under weak acid and neutral (pH value 4.5~8), precipitation occurs when acidic (pH value 4.2), strong base can be decolorized, poor stability to metal ions, and poor dyeability. |
| Use | Use as a blue pigment alone users are not much, usually with safflower yellow pigment into green pigment preparation, for ice cream, cakes, instant powder products and horseradish powder. Non-extracted cyanobacteria can also be used directly as a pigment and as a protein source. Preferably used in combination with citric acid and phosphate. |
the cyanophytic spirulina (Spirulina platensis;Arthorspira latenis) spores of the cyanophytic spirulina (Sprirulina) are aerated and cultured at 30~35 ℃ in a medium with carbonate or carbon dioxide as carbon source at pH 8.5 ~ 1l to obtain algae. after drying, the pigment and soluble protein in it are extracted with water, and the extract is concentrated in vacuum and spray dried.
Nostoc, a plant of the genus Nostoc of cyanophyta, can also be used. After Commune vanch, commonly known as Auricularia auricula, is rinsed with flowing water for 12~24 hours, water is added according to the raw material: water = 1:(5~6), beaten by a beater, the 95% is sieved through a 40-mesh sieve, and then homogenized under high pressure (<35 ℃,25MPa. After homogenization, it is left standing at room temperature for 40~48h in a column tower, and autolysis is carried out by the action of microorganisms and enzymes. After centrifugal separation (>4500r/mln, maximum 5500r /min), vacuum concentration with 89 ~ 92KPa, concentration ratio 4~5:1. Centrifugation and spray drying of the residue into rosary powder can extract pectin. The pigment paste obtained by centrifugation is vacuum dried at <40 ℃ to form the color cable powder. It can be embedded with β-CD to improve heat resistance.