Part A: Precipitation of casein Protein and Butterfat from Milk Mass of test tub
ID: 505161 • Letter: P
Question
Part A: Precipitation of casein Protein and Butterfat from Milk Mass of test tube 913 196. 8 Mass of test tube t milk sample Calculated mass of milk sample 5 chunks (hama auas) Observation: acetic acid milk at Mass of watch glass 4 Mass of watch glass curds 40 a6 calculated mass of curds Pari B: Precipitation of Whey Proteins from the Aqueous Milk Filtrate Mass of watch glass AMMAa 30 g Mass of watch glass dry whey protein +8 Calculated mass of whey protein am Biuret test observation roquvr no co Change Lab 18 The componeExplanation / Answer
1. A complete food contains all the proteins, carbohydrates, fats, water, vitamins and minerals that our body needs. Positive Benedict, oxalate and molybdate tests shows the presence of carbohydrates, salt oxalate (Ca, Mg, K and Na) and phosphates, respectively, in the milk sample. The protein may not be present in the whey (refer part B) but was detected positive in the casein (refer part C). The milk sample also contained about 83% water and 0.6% of fat. However, the sample of milk doesnot contain iodine as determined by iodine test. The vitamin and mineral content of the sample was not determined and needs to be tested. Hence, with this data claiming milk as a complete food will be inappropriate.