Biological Techniques: Paper Chromatography

Shows the basic principles and techniques in analyzing dissolved mixtures by using the methods of paper chromatograpy. Illustrates how the principle operates with materials available in the classroom (a paper napkin, water, and ink). shows the passage of the solution through the papers with time-lapse photography. Reveals how reliablility, accuracy, and versatility of this procedure are attained through refinements in materials and methods. Utilizes a separation of chlorophyll extract to show the method by which ratio fronts are obtained. Using amino acids, pictures how unkowns are compared with knows in their separation to indicate their chemical make-up.