松花蛋一般以鲜鸭蛋为原料,在蛋壳外涂上复和泥料,再经过一段时间腌制而成。松花蛋中氨基酸的含量比鲜鸭蛋高11倍,而且氨基酸的种类也比鲜鸭蛋多。但是如果购买了劣质松花蛋,不但营养成分已被破坏,而且食用品质极差,甚至无法食用。现介绍一下选购松花蛋的秘诀。选购松花蛋简单易行的办法是一掂、二摇、三看壳、四品尝。一掂:是将松花蛋放在手掌中轻轻地掂一掂, Songhua eggs generally fresh duck eggs as raw materials, coated with eggshell material and mud, and then pickled for some time. Songhua egg amino acids content 11 times higher than fresh duck eggs, but also more types of amino acids than fresh duck eggs. However, if the purchase of poor quality eggs, not only nutrients have been destroyed, and poor quality of food, or even inedible. Now introduce the secret of buying eggs. Easy way to buy Songhua Dan is a 掂, two shake, three to see shell, four taste. A 掂: the egg is placed in the palm of your hand Gently 掂 a 掂,