How do you make casein glue?

Answer 1

Skim milk, vinegar, baking soda, measuring cup, heat proof container, tablespoons, coffee filter, small plastic funnel, Popsicle sticks, small paper or plastic cups, masking tape, string, large bowl, kitchen food scale or a digital bathroom scale, and a minimum of 4 commercial white glues: Scotch® Quick Drying Tacky White Glue, Elmer's All Multipurpose White Glue®, Amos® White Craft Glue, Blick® Multi-Purpose White Glue. Also, safety goggles, apron, and gloves along with a Tri-fold display board. The food items (milk, vinegar, baking soda, coffee filters) can be purchased from the local supermarket. The commercial glues, cups, plastic funnel, masking tape, etc are available from a major retail (Wal-Mart, Target, Dollar General, etc) discount department store, and the Popsicle or craft sticks along with the Tri-fold display board can be purchased from an art & craft store. Introduction Casein is the principle protein of milk. It accounts for approximately one third of the non-aqueous (liquid) ingredients in cow's milk, from which commercial casein is obtained. The Casein protein can be used to make glue and in addition, casein is used in manufacturing of various goods including fabrics, adhesives, plastics, and protective coatings. In order to remove the casein from the milk, the product goes through a process known as precipitation. Essentially, the milk is heated and acid is added (vinegar). As the heating takes place, the casein content begins to shrink and expel moisture producing clumpy white solid curds and liquid whey. The next step in extracting the casein involves separating the whey from the curd by filtering. After the separation, a baking soda solution is added to neutralize the acid the curd is then subjected to pressure to further remove the water content. When the moisture content is reduced to an acceptable level, the curd is dried to form a hard plastic-like protein substance called casein, which can act as an adhesive. Digital photos can be taken during the experimenting process and the following websites offer down loadable related images that can be used on the display board: http://eggheadmarketing.files.wordpress.com/2008/02/glue.jpg http://cdn.dickblick.com/items/238/72/23872-group-1-3ww-l.jpg http://www.optimumnutrition.com/products/images/natural-casein-facts.jpg http://farm3.static.Flickr.com/2359/2379620937_85bba049b8.jpg?v=0 Research Questions