Crafting exceptional beer is a delicate balance between brewing artistry and maintaining quality over time. For brewers, one of the biggest challenges is controlling oxidation, a biochemical process that can significantly impact both the flavor and stability of the beer long before it reaches the consumer. This is particularly important for craft brewers, where extended distribution times can expose the beer to oxidative damage.

What Causes Oxidation?

At the molecular level, oxidation is primarily driven by Reactive Oxygen Species (ROS)—highly reactive molecules that form when oxygen interacts with trace metals like iron (Fe), copper (Cu), and manganese (Mn) present in beer. These trace metals act as catalysts, accelerating oxidative reactions that can negatively affect the beer’s organoleptic qualities.

Once formed, ROS such as hydroxyl radicals (•OH) и superoxide anions (O2•−) set off a cascade of reactions within the beer. These reactions lead to the breakdown of essential flavor compounds, resulting in the loss of freshness and aroma. More concerning is the formation of undesirable oxidation by-products, such as aldehydes, which impart off-flavors resembling cardboard, sherry, or wet paper.

In summary, oxidation causes:

  • Loss of desirable flavors like hop aromas and malt sweetness
  • Formation of off-flavors such as sherry or cardboard notes
  • Shortened shelf life of the beer

How to Combat Oxidation

To combat oxidation, brewers need to target both oxygen exposure and the effects of ROS. Antioxidants, particularly polyphenolic compounds like flavan-3-ols, provide crucial protection. These compounds neutralize ROS through two key mechanisms:

  1. Hydrogen Atom Transfer (HAT) – Polyphenols donate hydrogen atoms to neutralize ROS.
  2. Single Electron Transfer (SET) – Polyphenols transfer electrons to stabilize ROS.

Additionally, flavan-3-ols can chelate metal ions, binding to trace metals like Fe and Cu, preventing them from catalyzing further oxidative reactions.

Brew Shield: Your 100% Organic Solution

Brew Shield offers a natural solution to oxidation, formulated with polyphenolic compounds that help preserve your beer’s flavor and integrity without altering its profile. Its antioxidant properties:

  • Neutralize ROS through HAT and SET mechanisms
  • Chelate trace metals to stop oxidative reactions
  • Preserve the beer’s original flavor and extend its shelf life

Oxidation is a significant threat to beer quality, but through the strategic use of antioxidants like Brew Shield, brewers can safeguard their product from the damaging effects of ROS. With natural, effective solutions, your beer retains its intended flavor and freshness, ensuring that customers enjoy it at its best.