Exploring Novel Agro-industrial Residues in Aromatic Pellets for Food Smoking Applications
摘要
Food smoking is significantly influenced by the biomass used, affecting aroma, flavor, and process intensity. Pellet production for smoking still relies heavily on traditional woods, while agro-industrial residues such as husks, bagasse, and pruning waste are underutilized. This study investigates the physical, chemical, energetic, and thermal properties of pellets produced from lignocellulosic residual biomass, aiming for its efficient application in food smoking. For this purpose, the pericarp of Dipteryx alata, Carya illinoinensis, Citrus sinensis, Psidium guajava, and Citrus sinensis bagasse were used for pellet production. Diameter, length, apparent density, moisture, chemical composition, hardness, calorific value, energy density, combustion index, and thermogravimetric analysis were conducted. ANOVA, Tukey’s test, correlation, and multivariate analysis were applied to identify significant differences and similarities between the treatments. Pellets made from woody biomass (Carya illinoinensis, Citrus sinensis, and Psidium guajava) exhibited higher energy density (> 11.5 GJ m–3) and thermal stability, favoring efficient combustion. On the other hand, non-woody residual biomasses (Dipteryx alata and Citrus sinensis bagasse) displayed higher fixed carbon (> 21%) and extractive content (> 38%), influencing the release of volatile compounds. Moisture ranged from 1.42% to 10.17%, affecting apparent density and pellet formation. Thermogravimetric analysis (TGA) revealed greater thermal stability in woody biomasses, while the combustion index (ICOM) highlighted the more reactive combustion of biomasses with high volatile content. Results demonstrate that biomass choice directly affects combustion efficiency and volatile compound release, which is essential for smoking. The thermal stability of woody biomasses and the reactivity of non-woody ones highlight the potential for specific industrial applications.
Graphical Abstract