Effect of Concentration of NaOH and NaCl in Dipping Solution and Dipping Period of Egg in Completeness of Egg Pidan

This study carried out on the manufacturing of pidan. The production of pidan can be one of solutions for over-produced eggs and stable egg price. For the alkali-pickling solution for manufacturing of Pidan, the tested concentration of NaOH and NaCl were respectively as 3, 5, 7% and 5, 10, 15, 20%, and examined every 2 days for 14days. According to the results, pH value of alkali-pickling solution was increased by the increment of NaOH concentration and the pickling period, and was decreased by the increment of NaCl concentration. The pH value of egg yolk was increased by the increment of NaOH concentration, but it was not significantly different by the NaCl concentration. By the increment of NaOH and NaCl concentrations, the alkali infiltration in egg yolk and egg white was accelerated. Furthermore, the weight change of the eggs in the alkali-solution has no effects on manufacturing of Pidan. Liquefied albumen showed significant differences by NaOH concentration rather than that of NaCl. There was no liquefied albumen for 14days at 3% of NaOH, but it was found between 11-12days at 5% and 8-10days at 7%, respectively. The pH values of egg white when it was liquefied albumen were between 11.8 and 12.0. Pidan was made by heat treatment after 6-7days dipped in the solution at the concentration of 7%, about 10days at 5%, and 12-14days at 3% of NaOH, respectively. Although, the period of manufacturing of Pidan was saved by the increment of NaOH concentration, liquefied albumen was accelerated and the food preference was decreased by ammonia odor. Therefore, the suitable concentration of NaOH is between 3 and 5%, and that of NaCl is between 5 and 10% due to the effect of salinity by the soaking period. Through this study, optimal pickling solution and dipping time for manufacturing of Pidan was figured out, and also find out that it can save a time about 15days for manufacturing of Pidan.

침지액의 NaOH와 NaCl의 농도 및 계란 침지기간이 계란 피단의 완성도에 미치는 영향

본 실험은 계란의 과잉생산에 따른 여러 가지의 문제점을 해결하고 사육 농가의 소득을 증대하기 위해 계란으로 피단을 제조하는 방법을 실험하였다. NaOH의 농도를 3, 5, 7%로 기준하고 NaCl의 농도를 5, 10, 15, 20%로 기준하여 침지액을 제조하여 2일 간격으로 14일간 실험하였다. 침지액의 pH는 NaOH의 농도가 높을수록, 그리고 침지기간이 경과할수록 피단제조용 침지액의 pH는 증가하였고, NaCl의 농도가 높을수록 감소하는 경향이 나타났다. 난황의 pH는 NaOH의 농도가 진할수록 증가하였으나, NaCl의 농도에 따라서는 차이가 나타나지 않았다. NaOH와 NaCl의 농도가 높을수록 난황과 난백 침투속도는 빨라지는 것으로 나타났다. NaOH의 농도가 3%일 때 14일까지도 난백의 수양화가 되지 않았으나, 5%일 때는 11~12일째에, 7%일 때는 8~10일째에 각각 수양화가 발생하였다. 수양화가 되었을 때 난백의 pH는 11.8~12.0으로 조사되었다. NaOH의 농도가 3%일때는 12~14일 정도, 5%일 때는 10일 정도, 7%일 때는 6~7일 정도 침지 후 열처리를 하면 피단이 완성되었다. NaOH의 농도가 높을수록 침지기간 및 제조기간은 단축하였으나, 피단 난백의 수양화가 빠르게 진행되는 것이 큰 단점으로 나타났다. 따라서 NaOH가 3~5%정도가 알맞다고 생각되며, NaCl의 농도는 침지기간에는 무관하나 염도에 영향을 미치므로 5~10%정도 범위에서 조절하는 것이 적당하고 15~20%일 경우에는 염도가 높아 기호도가 떨어졌다.