Abstract
The use of agricultural by-products in the building engineering realm has led to an increase in insulation characteristics of biobased materials and a decrease in environmental impact. The understanding of cell wall structure is possible by the study of interactions of chemical compounds, themselves determined by common techniques like Van Soest (VS). In this study, a global method is investigated to characterise the cell wall of hemp shiv. The cell wall molecules were, at first, isolated by fractionation of biomass and then analysed by physical and chemical analysis (Thermal Gravimetric Analysis, Elementary Analysis, Dynamic Sorption Vapor and Infra-Red). This global method is an experimental way to characterise plant cell wall molecules of fractions by Thermal Gravimetric Analysis following by a mathematical method to have a detailed estimation of the cell wall composition and the interactions between plant macromolecules. The analyzed hemp shiv presents proportions of 2.5 ± 0.6% of water, 4.4 ± 0.2% of pectins, 42.6 ± 1.0% (Hemicellulose–Cellulose), 18.4 ± 1.6% (Cellulose–Hemicellulose), 29.0 ± 0.8% (Lignin–Cellulose) and 2.0 ± 0.4% of linked lignin.
Highlights
For thousands of years, lignocellulosic biomass like hemp has been cultivated
Conventional Van Soest method was applied on raw hemp shiv to determine proportions of molecules families [12]
The 1736 cm−1 stretching peak represents C=O unconjugated bond associated with acetyl groups from lignin and hemicellulose xylans
Summary
Lignocellulosic biomass like hemp has been cultivated. At the beginning, crop production was based on fibers to produce garments or ropes for the shipbuilding sector. Culture was extended to produce animal food, new high molecules for the pharmaceutical sector, second-generation biofuels and more recently waste has been used as bio-based materials for building engineering. These kinds of biobased products are interesting due to their insulation capacities, low carbon impact or their ability to increase air quality. Two of the most important parameters for bio-based building materials are microstructure and biochemical composition. Hemp is the usual biomass in bio-based building materials but today some plant particles are being investigated [10,11]. Environmental parameters, conditions, species or retting can influence biochemical composition [8]
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