Food & flavour Gallotannins are mutifunctional ingredients. The diagram shows the 4 major properties of the gallotannins for food applications. Protein binding Hydrolysable tannins are excellent protein binders through complex formation. They are able to remove undesired proteins and denaturate certain enzymes. In soft drinks and juices, Tanal 01, can be used as stabilising and clarification aid. This is usually accomplished by injecting a Tanal 01 solution followed by the addition of gelatine. Metal complexation Gallotannins are strong metal chelators. Adding a suitable amount of tannic acid will help to prevent oxidative reactions linked to free metal ions. Example: Tanal 02 can help to reduce the mineral taste found in some fruit juices Example: Tanal 04 is used to remove excessive amounts of iron or other heavy metals in sugar refining