3. Precipitation of protein with salt
3. Precipitation of protein with salt
Procedure:
1. Weigh and record the weight of 120 mL of milk / soymilk in the beaker.
2. Place the beaker with the milk on a hot plate. Heat the milk to boil and turn off the
heat. Monitor this step closely.
3. Add 1.6 grams of Epsom salt (magnesium sulfate, a mineral salt) to the hot milk and stir.
4. Wait until the curds are floating in an almost clear liquid.
5. Fasten a piece (2−3 layers) of cheesecloth over the top of a beaker with a rubber
band. Pour the curds and liquid into the beaker, collecting the curds in the
cheesecloth and allowing the liquid to drain into the bottom of the beaker.
7. Gather up the cheesecloth and squeeze out as much water as possible. Spread out the
cheesecloth to allow the curds to dry for 5 minutes.
8. Weigh the curds and record the results.