THE EXTRACTING METHOD OF DUCK FEET GELATIN BY HEAT TREATMENT METHOD

PURPOSE: A sampling method of duck foot gelatin is provided to have duck foot gelatin capable of using in various fields according to the quality characteristic. CONSTITUTION: A fat and a foreign substance which is visible to the naked eye are removed and cleaned from a duck foot. A washed duck foot is soaked in the pH1- pH13 of soaking solution which is fivefold weight (v/w) in comparison with of duck foot; expended at a temperature of 15-20°C for 20-30 hours. A swollen duck foot is washed in flowing water and neutralized to the pH5-pH7. A duck foot gelatin is extracted by using a neutralized duck foot through heat processing method. An extracted duck foot gelatin is filtered and coagulated. A fat layer which is in the upper layer of the coagulated duck foot gelatin is removed. The soaking solution is forming a range of the pH1-13 by using 0.1N hydrochloric acid and 40% of sodium hydroxide solution. [Reference numerals] (AA) Flipper; (BB) Socking for 24 hours in pH 1 solution; (CC) Washing until reaching pH 5.5; (DD) Extracting gelatin by using a constant-temperature water bath (65°C, 75°C, 85°C, 95°C), a pressure cooker and a microwave; (EE) Filtering by using hygiene filter cotton cloth; (FF) Cooling and clotting at 4°C