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2025
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Differentiation Between Beer Silica Xerogels and Hydrogels in Beer Production
The adsorption effect is relatively limited. Increasing the pore volume of xerogels to ≥1.2 mL/g and the specific surface area to ≥500 m²/g can effectively enhance the adsorption capacity for protein-polyphenol complexes.
1. Physical Properties and Adsorption Performance
1.1 Xerogels
The specific surface area is usually 350-450 m²/g, with a wide pore size range (e.g., 10-50 nm) and an iron content of ≤50 ppm. The adsorption effect is relatively limited. Increasing the pore volume of xerogels to ≥1.2 mL/g and the specific surface area to ≥500 m²/g can effectively enhance the adsorption capacity for protein-polyphenol complexes.
1.2 Hydrogels
They have a higher specific surface area (≥750 m²/g), a pore volume of 0.5-0.8 mL/g, and an iron content of ≤15 ppm. Due to their abundant microporous structure and high content of surface hydroxyl groups and hydrogen bonds, their adsorption capacity is significantly superior to that of xerogels, with better selectivity.
2. Usability and Environmental Friendliness
2.1 Xerogels
They are difficult to disperse, requiring a long stirring time, which easily introduces dissolved oxygen. Moreover, dust is prone to generate during addition and stirring, affecting the operating environment.
2.2 Hydrogels
They are easy to disperse, which can shorten the stirring time and reduce the introduction of dissolved oxygen. No dust is produced during the addition and stirring process, improving the production site environment.
3. Application Scenarios
3.1 Xerogels
They are often used in filter buffer tanks as beer stabilizers, suitable for general production capacity improvement needs.
3.2 Hydrogels
They are applicable to hard-to-stabilize beers and can be used in barrel aging (with a maturation time longer than 3 days) or filter buffer tanks, making them the best choice for stabilization treatment.
In summary, silica hydrogels outperform silica xerogels in adsorption performance, usability, and environmental friendliness, and are particularly suitable for application scenarios with high requirements for beer stability and purity.
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