生乳掺假试验方法(国外英文资料).docVIP

生乳掺假实验方法 Adulteration detection W - JS - GF - 42.21 Scope and applied literature This standard prescribes the methods of adulteration of milk in cows milk. This standard is suitable for adulteration of milk. GB/t5009.46-2003 analysis of food hygiene standards for milk and dairy products. The dairy inspector written by the ministry of agriculture. 2 the inspection of rice soup (juice) Principle: rice soup contains starch and starch is blue with iodine. 2.2 reagent: iodine solution: potassium iodide 4 grams and iodine 2 grams, plus a small amount of water dissolved, and then add water to 100ml. Operation 2.3: take milk 5ml of milk, boil it slightly, add a few drops of iodine, such as starch or rice, and blue or blue. The inspection of soybean milk and soybean cake water 3.1 saponin explicit color method The principle of 3.1.1: saponin in soybean milk, saponin can dissolve in hot water or hot alcohol, and can produce yellow with potassium hydroxide. 3.1.2 reagent: alcohol: ether (1:1) mixture. 25 percent hydroxide solution. 3.1.3 operation: take measured 20 ml milk, add 50 ml Erlenmeyer flask, adding 30 ml of ethanol ether mixture blending, plus 5 ml25 % potassium hydroxide solution, at the same time be blank contrast, if a sample is slightly yellow in presence of soya-bean milk. White color is normal. The examination of gelatin Principle 4.1: the Milky Way with the gelatine and bitter acid in the yellow reaction. 4.2 reagent: a 4% nitrate solution Solution: 2 grams of bitter acid dissolve in 100ML of distilled water, boil, slightly cool, and when crystallized in solution, pour out the liquid for use. 4.3 operating: take 10 ml milk, add 10 ml4 % mercury nitrate solution, let stand for 5 minutes, filtering, adding volume of saturated picric acid in the filtrate solution, such as gelatin generate a yellow precipitate. Negative is yellow and transparent. Test of sugar cane Principle 5.1: using the color reaction of sucrose and biphenol. The appropriate amount of milk aci