How does glutathione prevent browning in white wine?

 

In the world of wine, maintaining the stability of its color and flavor is crucial. Browning is a common problem in the wine production process. It not only affects the visual appeal of the wine, but may also change its taste and quality. Glutathione (GSH), as a powerful natural antioxidant, has attracted attention for its significant effect in preventing browning of white grape juice.

1. Antioxidant mechanism of glutathione

Glutathione, a tripeptide composed of glutamic acid, cysteine and glycine, is one of the most important antioxidants in organisms. In winemaking, GSH reacts with o-quinone formed by polyphenol oxidases (such as tyrosinase and laccase) to generate 2-S-glutathione-based catalic acid (GRP), effectively Traps o-quinone in its colorless form, limiting melanin formation and thus protecting grape juice from browning.

2. Comparison between glutathione and sulfur dioxide

Studies have shown that although GSH is slightly less effective than SO2 in reducing oxygen consumption rate, it performs well in forming GRP and effectively protects grape juice under healthy grape conditions from browning. Under controlled conditions, GSH reduced the blue-yellow component of the color, demonstrating its powerful protective effect. This finding suggests that GSH can act as an effective antioxidant, reducing the risk of browning during wine production.

3. Application prospects of glutathione in wine making

Glutathione, as a natural antioxidant, shows great potential in winemaking. Not only does it protect grape juice and wine from browning, it also preserves the wine's natural flavor and color. The use of GSH provides a new and healthier way to protect wine making, helping to meet the market demand for high-quality wine.

The antioxidant properties of glutathione make it a strong candidate for preventing browning of white grape juice. It protects the color of the grape juice by trapping o-quinone and forming GRP, which limits melanin formation. GSH not only serves as a replacement for SO2, but also provides an effective protective measure under healthy grape conditions. With further research on the mechanism of action of GSH, it is expected that more effective application methods will be discovered to improve the quality of wine and meet consumers' needs for health and environmental protection.

References:

[1] Bustamante M, Giménez P, Just-Borràs A, et al. Use of Glutathione, Pure or as a Specific Inactivated Yeast, as an Alternative to Sulphur Dioxide for Protecting White Grape Must from Browning[J]. Foods, 2024, 13(2): 310.

*Special note - This article is for informational purposes only and cannot replace a doctor's treatment diagnosis and advice. It should not be regarded as a recommendation or proof of efficacy of the medical products involved. If it involves disease diagnosis, treatment, and rehabilitation, please be sure to go to a professional medical institution to seek professional advice.

by GSHWORLD

GSHWORLD is China Biological API Manufacturer. China Glutathione Supplements powder suppliers & best Glutathione benefits raw material Factory.