|MadSci Network: Biochemistry|
Hi Kelly, I spoke with Dr. Mary Ellen Camire, who is a faculty member in our Department, concerning your questions. She has alot of expertise with natrually occurring chemicals. She said that tannins are the compounds found in black walnut hulls that stain the skin. The reason they lose the ability to stain the skin when they age is that moisture is lost from the hulls. The tannins are then bound to the solids of the hulls. If you were to extract the ground up hulls with alcohol or a mixture of alcohol and water, you should be able to extract the tannins. By evaporating the solvents, you can concentrate the tannins. We were glad to see a question from Maine since we are in the Department of Food Science & Human Nutrition at the University of Maine. Al Bushway Profeesor of Food Science
Try the links in the MadSci Library for more information on Biochemistry.