The greatest glucose yield (0.75 g/g pulp) was obtained under
hydrothermal conditions (140 C for 1 h) without addition of H2SO4
(Fig. 2). Yields were equivalent to approximately 90% of the theoretical
value according to the composition shown in Table 1. No
major differences in glucose yields between 120 C and 160 C were
found with or without addition of 0.1% H2SO4 (Fig 2). Glucose yields
from hydrothermal reaction with 2% H2SO4 were lower than those
with or without 0.1% H2SO4 (Fig. 2), suggesting formation of byproducts
with increased H2SO4 concentration. Reports have indicated
that by-products, such as hydroxylmethyl-furfural (HMF),
furfural, furoic acid, and phenol, are produced from irreversible
conversion of pentoses, hexoses, and lignin during pretreatment
with acid [8]. Based on these results, hydrothermal reaction at
140 C without H2SO4 was used to pretreat cassava pulp.
The greatest glucose yield (0.75 g/g pulp) was obtained underhydrothermal conditions (140 C for 1 h) without addition of H2SO4(Fig. 2). Yields were equivalent to approximately 90% of the theoreticalvalue according to the composition shown in Table 1. Nomajor differences in glucose yields between 120 C and 160 C werefound with or without addition of 0.1% H2SO4 (Fig 2). Glucose yieldsfrom hydrothermal reaction with 2% H2SO4 were lower than thosewith or without 0.1% H2SO4 (Fig. 2), suggesting formation of byproductswith increased H2SO4 concentration. Reports have indicatedthat by-products, such as hydroxylmethyl-furfural (HMF),furfural, furoic acid, and phenol, are produced from irreversibleconversion of pentoses, hexoses, and lignin during pretreatmentwith acid [8]. Based on these results, hydrothermal reaction at140 C without H2SO4 was used to pretreat cassava pulp.
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