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<p>Thermal modification is an eco-friendly technique to enhance performance of wood by altering its chemical properties. In this study, the effect of thermal treatment on the chemical composition of <i>Albizia lebbeck</i>, an important agroforestry species, was investigated. Wood samples were treated under vacuum at temperatures ranging from 140 to 200&#xa0;°C for 2 and 4&#xa0;h; contents of alpha cellulose, lignin, holocellulose, and hemicellulose were evaluated. The treatment produced visible colour changes, with samples becoming progressively darker at higher temperatures and longer durations. FTIR spectra indicated degradation of hemicelluloses along with alterations in hydroxyl groups. X-ray diffraction analysis revealed rise in cellulose crystallinity, particularly at 200&#xa0;°C after 4&#xa0;h of exposure. One-way ANOVA indicated significant effects of thermal treatment on all components (<i>p</i> &lt; 0.001). Alpha cellulose and holocellulose declined with increasing treatment severity, while hemicellulose was the most heat-sensitive fraction, decreasing sharply from 20.4% in the control to 10.4% at 200&#xa0;°C for 4&#xa0;h. In contrast, lignin content increased from 26.0% to 33.7%, reflecting its higher thermal stability and condensation reactions. Correlation analysis revealed strong negative associations between lignin and carbohydrate fractions, confirming their inverse relationship during thermal modification. The findings demonstrate the potential of thermal treatment to add value to this agroforestry species, contributing to sustainable utilization and reducing dependence on conventional timber sources.</p>

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Evaluating effect of thermal treatment on chemical composition and colour of Albizia lebbeck (L. Benth.)

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Anuvarna K,
  • Amey Kale,
  • B. Ganesh Reddy,
  • Bhushan Kelkar,
  • Vinod Kumar,
  • Shailendra Kumar

摘要

Thermal modification is an eco-friendly technique to enhance performance of wood by altering its chemical properties. In this study, the effect of thermal treatment on the chemical composition of Albizia lebbeck, an important agroforestry species, was investigated. Wood samples were treated under vacuum at temperatures ranging from 140 to 200 °C for 2 and 4 h; contents of alpha cellulose, lignin, holocellulose, and hemicellulose were evaluated. The treatment produced visible colour changes, with samples becoming progressively darker at higher temperatures and longer durations. FTIR spectra indicated degradation of hemicelluloses along with alterations in hydroxyl groups. X-ray diffraction analysis revealed rise in cellulose crystallinity, particularly at 200 °C after 4 h of exposure. One-way ANOVA indicated significant effects of thermal treatment on all components (p < 0.001). Alpha cellulose and holocellulose declined with increasing treatment severity, while hemicellulose was the most heat-sensitive fraction, decreasing sharply from 20.4% in the control to 10.4% at 200 °C for 4 h. In contrast, lignin content increased from 26.0% to 33.7%, reflecting its higher thermal stability and condensation reactions. Correlation analysis revealed strong negative associations between lignin and carbohydrate fractions, confirming their inverse relationship during thermal modification. The findings demonstrate the potential of thermal treatment to add value to this agroforestry species, contributing to sustainable utilization and reducing dependence on conventional timber sources.