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<p>The particle size of spray-dried food powders plays a crucial role in determining their quality, functionality, and potential applications. This study examined the effects of spray drying parameters—specifically inlet air temperature and feed concentration—on particle size characteristics and sedimentation behavior of soymilk powder. A central composite design was used to assess their influence on Sauter mean diameter, particle size distribution span, and sedimentation index. Particle size ranged from 168.42 to 278.52&#xa0;μm and was significantly affected by both parameters. Higher feed concentrations resulted in smaller particles, while inlet temperature showed a non-linear effect. Span values (1.11–1.93) indicated moderately polydisperse distributions, with broader spans generally linked to higher feed concentrations and drying temperatures. The average sedimentation index was 82.8%, influenced by both particle size and distribution breadth. Regression models demonstrated good fit (<i>R²</i> = 0.838–0.880; <i>p</i> = 0.004–0.0109), confirming statistical significance at the 95% confidence level. These findings provide valuable insights for optimizing spray drying conditions to improve the physical and functional properties of plant-based powdered products.</p>

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Effects of spray drying conditions on the particle size distribution and sedimentation behavior of soymilk powder

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Duc Quang Nguyen

摘要

The particle size of spray-dried food powders plays a crucial role in determining their quality, functionality, and potential applications. This study examined the effects of spray drying parameters—specifically inlet air temperature and feed concentration—on particle size characteristics and sedimentation behavior of soymilk powder. A central composite design was used to assess their influence on Sauter mean diameter, particle size distribution span, and sedimentation index. Particle size ranged from 168.42 to 278.52 μm and was significantly affected by both parameters. Higher feed concentrations resulted in smaller particles, while inlet temperature showed a non-linear effect. Span values (1.11–1.93) indicated moderately polydisperse distributions, with broader spans generally linked to higher feed concentrations and drying temperatures. The average sedimentation index was 82.8%, influenced by both particle size and distribution breadth. Regression models demonstrated good fit (R² = 0.838–0.880; p = 0.004–0.0109), confirming statistical significance at the 95% confidence level. These findings provide valuable insights for optimizing spray drying conditions to improve the physical and functional properties of plant-based powdered products.