Studies On Preparation And The Security Of Preserved Eggs

China is a country with the largest egg, poultry and eggs is an important food source, while the processing of eggs, preserved eggs is the most important one. With the improvement of living standard, lead-free production of preserved eggs have become the main trend of preserved eggs. Preserved eggs of lead-free production process, in order to generate a large number of Songhua, and add a large number of useful elements to meet the sensory needs of people, meet people, "Nutrition," "health" of the trend, thus increasing its economic value added, has important theoretical and the actual value. Lead-free eggs, preserved eggs also studied the heavy metal content in order to ensure food security is also of great practical significance.In this paper, China has a long history of preserved eggs (preserved eggs) process technics improvements, preserved eggs using lead-free processing technics to analyze the processing of sensory evaluation of various conditions on preserved eggs (especially the Songhua), will determine the production of preliminary art of preserved eggs optimum conditions (a large number of Songhua produce); analysis of lead-free processing in the process of preserved eggs, the eggs and heavy metals within the trend of pH change and heavy metals on the eggs of the foreign aid and the interaction of heavy metals. The major findings are as follows.1. When the feed of single factor experiment, we can see, NaOH concentration, the type of alkali, heavy metal type and concentration of heavy metals on the sensory evaluation of preserved eggs and preserved eggs, the greatest impact on passing rates, while the NaCl concentration, the concentration of tea leaves little influence, MgC12 minimal impact.2. Single factor in the feed solution experiments, NaOH concentration on the sensory evaluation of preserved eggs and preserved eggs affected the passing rate increased at first and then decreases, NaCl concentration no significant relationship, the type of alkali, the role of strong alkali, which Best NaOH, KOH second, weak alkali effect is not good, the concentration of the addition of metal compound, it affected the passing rate increased at first and then decreases, it no significant relationship, the heavy metals, Cu SO4 sensory evaluation of the preserved eggs, or preserved eggs are the best pass rate, Cu SO4 and Fe SO4 mixture followed. Concentration of preserved eggs tea senses to a certain extent, the concentration of 2% when the best, was not changed, but the tea's concentration on the passing rate of preserved eggs were not significantly affected.3. The optimum NaOH concentration can be 5 to 6%, NaCl concentration of 4% to 6%, the best type of alkali is NaOH, the best heavy metal for the Cu, the best tea concentration of 2%, MgCl2 concentration on the preserved eggs not effects can be 0, the best temperature of 20℃to 25℃4. The affection of factors of songhua, we can see, the NaOH concentration, the higher the colour of songhua better, the tea concentration,the higher the songhua bigger, the concentration of heavy metal, the higher the songhua more.5. The main factors in the feed solution orthogonal, we can see a variety of factors taken into account, the optimal conditions were:5%NaOH, the type of heavy metal Cu, the concentration of heavy metals in 0.4%concentration of tea 2%, NaCl concentration of 5%.6. The total metal content of the egg with the heavy metal content of external sources increases. This determination of the foreign aid of copper, zinc and iron in the finished product under the skin of different levels of heavy metals within the testicles. Inside the eggs found in copper, zinc, iron with exogenous copper, zinc, iron dosage increases.7. Mixed copper and zinc can significantly reduce the copper content in preserved eggs. Mixed copper and zinc content of processed products was lower than that of copper Method for processing copper products. Description of zinc on so we had to lower copper production of preserved eggs, should join the appropriate amount of zinc.8. Exogenous iron on the iron content of eggs is greater than that of exogenous zinc (or copper) on the eggs of zinc (or copper) of. There is no way to join the production of preserved eggs of iron in the iron content of only 18.62mg/kg, after adding 0.1% iron becomes 27.68mg/kg, so the increase in the amount of iron on the 9.06mg/kg, under the same conditions, copper, increase the amount of zinc was 0.26mg/kg,1.27mg/kg, Cu in the impact of copper on the eggs in the smallest, which indicates that zinc and iron more easily into the egg inside.