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The carotenoids Is an antioxidant food, food rich in carotenoids can prevent physical contact with a destruction of molecules known as free radicals. Related studies have shown that adequate intake from diet carotenoids can reduce the risk of suffering from a variety of chronic diseases such as heart disease and cancer. And eggs is one of mankind's best source of nutrition, eggs contain vitamins, minerals, protein and other nutrients of high biological value. According to different rearing methods, it can be divided into feed eggs and eggs in soil two. Native chicken egg yolk output, deep color, high content of carotenoids in the egg yolk, and welcomed by the people. The purpose of the research is the analysis of the eggs in the soil of nutrients, and study the main components and functions of carotenoids in eggs in soil has an important significance to the development of eggs in soil functional foods. The main findings are as follows: 1. Eggs in soil nutrients analysis papers soil egg yolk nutrients feed Egg yellow nutrients, the results showed that: of soil egg whites in egg weight proportion than feed egg low of 5.82%; 5.91% higher than the proportion of soil egg yolk eggs than feed. 0.03% moisture in the soil eggs, egg white is 3.55% lower than the feed eggs, crude protein content is 0.07% higher than the feed, eggs, crude fat content than feed eggs. The moisture in the soil egg yolk is low compared with the moisture in the feed Egg yellow, low crude protein content, crude fat content feed eggs high cholesterol content than feed eggs, low content of calcium, phosphorus content. Feed egg yolk RCF value of 4.0, while the of soil egg yolk the RCF value of 9.2. Soil egg yolk carotenoid content than feed Egg yolk carotenoid content. Soil egg carotenoids extracted papers to study soil egg carotenoids extraction process, using a single factor and orthogonal experiment method to draw the following optimum extraction conditions: soil egg yolk lyophilized powder. raw materials, petroleum ether: acetone = 2:1 as the extraction solvent, extraction temperature is room temperature, extraction time 75min, extraction times 3 times, solid-liquid ratio of 1:5. 3. eggs in soil carotenoid stability The research paper examines the different temperature, light, solvent, pH, metal ions on the stability of soil eggs in carotenoids, results show that: the temperature of the eggs in the soil in the stability of carotenoids basic impact heating at 80 ℃ six hours still has good stability; basic organic solvents on the stability of the soil eggs in carotenoids had no effect; larger, more stable in alkaline; lighting conditions, the stronger the acidity of the soil eggs, affect the stability of carotenoids , the worse the stability of the carotenoid solution; divalent iron ions in the class of the soil eggs carotene stability, lead ion followed affecting the stability of the soil eggs carotenoids, calcium, magnesium, sodium, aluminum, copper and other metal ions on the stability of the carotenoid has a certain extent, but the effect was not significant; the stability of the solution of the type of food additives of carotenoids have a major impact, the influence of the concentration will have small, wherein glucose increase carotenoid prime stability of the substance, an acidic substance such as citric acid, ascorbic acid of carotenoids substance Stability different; oxidant and reductant on carotenoid solution stability, greater impact, with the hydrogen peroxide and sodium thiosulfate concentration, the solution stability obvious decline. 4 eggs in soil in carotenoids Isolation and identification papers through the use of thin-layer chromatography, the chemical color identification and high performance liquid chromatography to identify the types of soil egg carotenoids. The results showed that soil eggs carotenoid extract containing lutein, α-carotene and β-carotene.
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