Pyrolysis mass spectrometry of coastal Bermudagrass (Cynodon dactylon (L.) Pers.) and ‘Kentucky-31’ tall fescue (Festuca arundinacea Schreb.) cell walls and their residues after ozonolysis and base hydrolysis

Water soluble reaction products from ozonolysis of grasses

“…These data, as well as those presented in this study on the products of ozonolysis, help clarify digestibility studies, where either a lag or total prevention in the digestibility of cell wall monosaccharides occurred (Shefet and Ben-Ghedalia, 1982) and a washing away of the products of ozonolysis restored digestibility (Narasimhula et al, 1989). The fact that cell wall monosaccharides were digested at a greater rate after this lag is explained from pyrolysis mass spectrometry studies (Morrison et al, 1990) of the residues remaining after water-washing of ozone-treated CBG and K-31 cell walls. The results suggest that this residue is almost pure polysaccharide with little phenolic material remaining.…”

Thermochemical pretreatment of lignocellulosic biomass

“…Traditionally, ozone had been used to bleach pulps replacing chlorine as the oxidant (Roncero et al, 2003). Ozonolysis, typically conducted at atmospheric conditions, has been used in combination with other alkaline pretreatments to extract lignin from forage residues and hence enhance enzymatic digestibility (Akin and Morrison, 1988;Ben-Ghedalia and Miron, 1981;Morrison et al, 1991). Ozone reacts selectively with lignin-based aromatics producing several types of degradation products (primarily aromatic aldehydes and aliphatic organic acids) that have been found to inhibit biological processing of ozone treated biomass (Quesada et al, 1997).…”