The extractives, acid-insoluble lignins, and ash contents of CGT1, CGT2 and CGT are presented on an original starting material basis in Table 2. The total ash content was similar for both samples and recorded at 8–13%. Soil contamination during harvesting and storage is most likely responsible for this elevated ash content. Samples were sequentially extracted with water and ethanol to remove the extractives fractions whilst the recovered solids represented total fibre. The total extractives component was relatively high at 26–28% compared to other herbaceous crops like wheat straw (18%) and corn stover (10%) (Vancov and McIntosh, 2011a,b; Weiss et al., 2010). The water soluble fractions were brownish in appearance with a faint sweet aroma and represent
about 15–17%. HPLC analysis of this fraction failed to reveal detectible levels of monomeric sugars. CGT1 contained more ethanol extractives than CGT2; 12.5% and 9.3% respectively, which is presumably due to the higher proportion of non-lint material in the former sample.
The extractives, acid-insoluble lignins, and ash contents of CGT1, CGT2 and CGT are presented on an original starting material basis in Table 2. The total ash content was similar for both samples and recorded at 8–13%. Soil contamination during harvesting and storage is most likely responsible for this elevated ash content. Samples were sequentially extracted with water and ethanol to remove the extractives fractions whilst the recovered solids represented total fibre. The total extractives component was relatively high at 26–28% compared to other herbaceous crops like wheat straw (18%) and corn stover (10%) (Vancov and McIntosh, 2011a,b; Weiss et al., 2010). The water soluble fractions were brownish in appearance with a faint sweet aroma and represent
about 15–17%. HPLC analysis of this fraction failed to reveal detectible levels of monomeric sugars. CGT1 contained more ethanol extractives than CGT2; 12.5% and 9.3% respectively, which is presumably due to the higher proportion of non-lint material in the former sample.
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