Scholarlink

<p>Pomelo seeds (<i>Citrus maxima</i> (Burm.) Merr.) contain relatively high lipid levels and are therefore susceptible to oxidative degradation during thermal stabilization processes such as drying. This study aimed to examine the relationship between moisture transport, lipid oxidation kinetics, and structural–chemical changes during drying. Pomelo seeds were convectively dried at 50–70 °C, followed by kinetic analysis of drying and oxidation and structural characterization using SEM, FTIR, XPS, and XRD. The results showed that increasing temperature accelerated both moisture diffusion and lipid oxidation. The effective moisture diffusivity increased from 2.09 × 10⁻¹⁰ to 3.59 × 10⁻¹⁰ m² s⁻¹, corresponding to a diffusion activation energy of 25.8 kJ mol⁻¹. Meanwhile, the oxidation rate constant increased from 0.0029 to 0.0067 min⁻¹, with an activation energy of 38.1 kJ mol⁻¹. The activation energy ratio (Eaₒₓ/Ea Deff = 1.48) indicates that lipid oxidation is more temperature-sensitive than moisture diffusion. Trade-off analysis indicated that drying at 60 °C (Ψₙ ≈ 1.28) provided a balanced condition between accelerated moisture transport and controlled oxidative progression. Chemical changes during drying were reflected by an increase in the carbonyl index from 0.93 to 1.13, associated with the formation of carbonyl groups (C=O). XPS analysis revealed an increase in the O/C ratio from 0.34 to 0.39, with greater contributions from C–O and C=O functional groups. XRD analysis showed an increase in biomass crystallinity from 44.93% to 65.70% during drying. The trade-off between moisture diffusion and lipid oxidation provides a quantitative framework for determining more selective drying conditions in lipid-rich biomass.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Thermal sensitivity of moisture diffusion and lipid oxidation during drying of Citrus maxima seeds

  • 期刊论文

  • 发表日期：

    2026年5月25日

查看全文
  • Budianto Budianto

摘要

Pomelo seeds (Citrus maxima (Burm.) Merr.) contain relatively high lipid levels and are therefore susceptible to oxidative degradation during thermal stabilization processes such as drying. This study aimed to examine the relationship between moisture transport, lipid oxidation kinetics, and structural–chemical changes during drying. Pomelo seeds were convectively dried at 50–70 °C, followed by kinetic analysis of drying and oxidation and structural characterization using SEM, FTIR, XPS, and XRD. The results showed that increasing temperature accelerated both moisture diffusion and lipid oxidation. The effective moisture diffusivity increased from 2.09 × 10⁻¹⁰ to 3.59 × 10⁻¹⁰ m² s⁻¹, corresponding to a diffusion activation energy of 25.8 kJ mol⁻¹. Meanwhile, the oxidation rate constant increased from 0.0029 to 0.0067 min⁻¹, with an activation energy of 38.1 kJ mol⁻¹. The activation energy ratio (Eaₒₓ/Ea Deff = 1.48) indicates that lipid oxidation is more temperature-sensitive than moisture diffusion. Trade-off analysis indicated that drying at 60 °C (Ψₙ ≈ 1.28) provided a balanced condition between accelerated moisture transport and controlled oxidative progression. Chemical changes during drying were reflected by an increase in the carbonyl index from 0.93 to 1.13, associated with the formation of carbonyl groups (C=O). XPS analysis revealed an increase in the O/C ratio from 0.34 to 0.39, with greater contributions from C–O and C=O functional groups. XRD analysis showed an increase in biomass crystallinity from 44.93% to 65.70% during drying. The trade-off between moisture diffusion and lipid oxidation provides a quantitative framework for determining more selective drying conditions in lipid-rich biomass.