The aim of the project is the application of new chemical and biotechnological processes to fruit wastes, to provide them with added value by obtaining new compounds to be used in tanning, as an alternative to current tanning products as glutaraldehyde. The preparation of new tanning agents from easily accessible wastes will reduce the carbon footprint and pollution generated by the use of chromium salts. In addition, these new tanning agents should improve the properties of the skin once tanned.