Physicochemical Characterization of Vitis vinifera Pruning Shots from Mendoza, Argentina: Extraction of Lignocellulosic Products

For the first time, a complete physicochemical characterization of pruning residues from red grape varieties Cabernet Sauvignon (CSPR) and Malbec (M-PR) from Mendoza, Argentina is reported. In addition, the extraction of lignocellulosic material by using an environmentally friendly methodology is reported, yielding 13.33 wt% for CSPR and 8.08 wt% for M-PR. According to laser diffraction analysis (LD), the particle-size distribution is similar for both varieties. Fourier transform-infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning-electron microscopy (SEM), optical microscopy (OM), and X-rays diffraction (XRD) show the presence of lignin and cellulose in both samples. It may be concluded that vine shoots are an inexpensive and widely available source to obtain lignin and cellulose for multiple purposes, such as composites and blends.