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Purple sweet potato physicochemical properties of red pigment


Absorption peak is still 52:0 nin Department, but the light density in Table 3 with various metal ions on the Stability of Sweet Potato Color Table3InfLuenceofmetaliottsonthestabilityofredpigmentsfromPSP scale value is subject to change, in which Al and Fe 3 The influence of potassium sorbate pH3 conditions, added preservatives, the pigment color and the absorption peaks were not changed. preservatives, optical density with concentration from 0,0.02:, 0.04,[link widoczny dla zalogowanych],0.06,0 .1g/t00ml changes were 0.42:6,0.42:1,0.419,0.422 and 0.428, the change is minimal. This shows that the concentration of preservatives used in food range the domestic stability of the pigment Influence of ascorbic acid did not affect .2.9 addition of ascorbic acid solution pH3 pigments, the color change little. only when the Vc to a certain amount, only the color changes. The optical density is presented along with the increase of its concentration decreased gradually . when its concentration gradually increased from 0 1,2,[link widoczny dla zalogowanych],3 and 4, the optical density decreased from 0.401 in order to 0.397,0.394,0.391 and 0.386. shows that the pigment is sensitive to ascorbic acid . in the use of the pigment in the ascorbic acid concentration should be preferably less than 3 .3 continental countries such as the right of heart Sweet Potato Color Shiu physicochemical properties of 2.10, reducing the antioxidant pigment in the presence of oxidizing or reducing agent,[link widoczny dla zalogowanych], the color change is not large, but the optical density change. NaHSO optical density of the reducing agent 0.451 to 0.457, 1.3; and add the oxidant HO: The optical density decreased to 0.414 from 0.451, to reduce 8.2, showing that the antioxidant pigment is weak, strong reducing resistance of Li .2. II the stability of pigment in the drinks to a variety of drinks, can make the color even and beautiful, crystal clear. The pigment added 4 drinks in this place in the room 90d, almost no change in appearance, optical density decreased slightly, by 10 to 30. shows that the pigment used in drinks is feasible .3 discussed above, purple sweet potato pigment common characteristics with anthocyanins. In acidic conditions, was stable red, light, heat, food additives, and most of the general metal ions on the stability of small, Al of sweet potato skin pigment previous findings ��kiss Si, indicating that potato tuber skin and flesh pigment contained very similar, but whether the same molecular structure remains to be further confirmed. this study did not detect pathogens pigment , heavy metals and other limited term indicators in line with national standards for food additives. The pigment extracted directly from natural edible plants, the extraction process is not harmful by any resulting changes in pigmentation or pharmaceutical means, in line with FAO / WHO Joint Expert Committee on Food Additives 21 of 1977 Regulations for the report can be used as non-toxic food additive safety. In addition, citric acid extract of sweet potato red pigment can be used as food coloring additives, but also reduce the food both citric acid and soluble sugar the proportion of ingredients commonly used, can greatly reduce the cost. reactant used in this study species easy to complex, low cost; the use of simple technology, investment in small, light pollution,[link widoczny dla zalogowanych], high safety; the resulting pigment toxicity, good stability can be widely used in food, pharmaceutical and cosmetics industries. Therefore, as a way of comprehensive utilization of sweet potato, purple sweet potato red pigment has a great potential for development.
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