Study Of Color Retentions Of Natural Edible Pigments And Its Application

Chaos due to Sudan red and Malachite green caused great alarm on food safety, deepening the doubts about the safety of synthetic pigments, while natural pigments represent so many unique merits that they are loved more and more recently. For example, most of them are derived from animal vegetable tissue, with high security and no toxic action and side effect;and most of them are indispensable to human or they are vitamin for themselves or something alike;and some of them can be used as drug, preventing diseases;and their color are natural to consumers, and some of them with specific scent can satisfy consumers. However, the poor stability and high price hold back their exploration and application. So scientific researchers placed lots of emphasis on the study of their stabilities and physiological functions and so on, and made a good deal of favorable work.The thesis studied the relation between structures of natural pigments and their color retentions, and researched the factors influencing their color retentions in detail, such as light, temperature, oxygen, pH value, medium polarity, metal ions and additives. Results showed that color retention behavior of aromatic compounds and aliphatic compounds, fading or changing mechanism, main influencing factors and so on were essentially different. And a good many complementary traits of two types of natural pigments, and variable discipline between theoretical arithmetic heat offormation of some natural pigments and their color retentions under light were also discovered. So the new classification of natural pigment by dichotomy was put forward firstly, and the methods of improving natural edible pigment's color retention were set up tentatively, which were to forecast, increase and improve the stability of natural pigment and promote the process of the replacement of unhealthy synthesis pigments by natural edible pigments. The methods included the change of microenvironment, complementation of two types of pigments and input of stabilizer. Applied to the practice, the methods have taken good effects, and they would be very helpful to the development of natural edible pigments.