Pigment stability

Rodriguez-Saona, L.E. et al., Color and pigment stability of red radish and red-fleshed potato anthocyanins in juice model systems, J. Food Set, 64, 451, 1999. 

Pigment Stability, Bioavailability, and Impacts on Human Health... 

Choi, M.H., Kim, G.H., and Lee, H.S., Effects of ascorbic acid retention on juice color and pigment stability in blood orange Citrus sinensis) juice during refrigerated storage, Food Res. Int, 35, 753, 2002. 

Torreggiani, D., Fomi, E., Guercilena, I., Maestrelli, A., Bertolo, G., Archer, G.P., Kennedy, C.J., Bone, S., Blond, G., Contreras-Lopez, E., and Champion, D. 1999a. Modification of glass transition temperature through carbohydrates additions Effect upon colour and anthocyanin pigment stability in frozen strawberry juices. Food Res. Int. 32, 441 146. 

Zirconium sulfate is used in tanning white leather, as a catalyst support, to precipitate proteins and amino acids, and as a pigment stabilizer. 

Thus, the intense red wine color and its preservation over years require some pigment stabilizing mechanisms to take place. Such stabilization is achieved, on the one hand, through... 

ICI produces light- and weatherfast chrome yellow pigments stabilized with antimony compounds and silicates in the presence of polyhydric alcohols and hydrox-yalkylamines [3.138],... 

Chrome yellow pigments stabilized with a large amount of silicate play a major role in the production of colored plastics (e.g., PVC, polyethylene, or polyesters) with high temperature resistance. Incorporation into plastics also improves their chemical resistance to alkali, acid, sulfur dioxide, and hydrogen sulfide. 

Structurally modified PVF has been extruded.66 Thin films are manufactured by extrusion of a dispersion of PVF in a latent solvent.67 Such dispersion contains usually pigments, stabilizers, plasticizers, and flame retardants as well as deglossing agents if needed. The solvent is removed by evaporation. The extruded film can be biaxially oriented and the solvent is removed by evaporation only after the orientation is completed. 

On the more commercial front, the photooxidation of polymers continues to attract attention with a continued special interest in natural materials. Bio- and photodegradable plastics are important for agricultural usage. The same applies to polymer stabilisation where commercial applications dominate significantly with much emphasis on the synergistic behaviour of stabilisers. For dyes and pigments stability continues to be of major concern. 

Torreggiani, D., Fomi, E., Guercilena, I. et al. 1999. Modification of glass transition temperature through carbohydrates additions Effect upon color and anthocyanin pigment stability in frozen strawberry juices. Food Research International 32 441-446. 

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