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Table 3 Hydroxycinnamic acids detected in sugarcane bagasse before and after pretreatment via an alkaline-sulfite chemithermomechanical process or chlorite delignification

From: Fate of p-hydroxycinnamates and structural characteristics of residual hemicelluloses and lignin during alkaline-sulfite chemithermomechanical pretreatment of sugarcane bagasse

Sample Hydroxycinnamic acids (g/100 g of pretreated bagasse) Solids yield (%) Mass balance (g/100 g of original bagasse)
Mild hydrolysis Severe hydrolysis Mild hydrolysis Severe hydrolysis
Ferulic p-Coumaric Ferulic p-Coumaric Ferulic p-Coumaric Ferulic p-Coumaric
Untreated 0.28 ± 0.03 1.14 ± 0.08 1.5 ± 0.1 3.7 ± 0.4 100 0.28 1.14 1.5 3.7
2.5% Na2SO3 + 1.25% NaOH 0.20 ± 0.03 1.1 ± 0.1 1.2 ± 0.4 4.4 ± 0.3 86.8 0.17 0.94 1.1 3.8
5% Na2SO3 + 2.5% NaOH 0.11 ± 0.01 0.80 ± 0.05 1.4 ± 0.1 2.7 ± 0.3 84.1 0.09 0.67 1.2 2.3
10% Na2SO3 + 5% NaOH 0.11 ± 0.01 0.11 ± 0.03 0.7 ± 0.1 1.9 ± 0.4 81.8 0.09 0.09 0.6 1.5
Chlorite-delignified sample 0.08 ± 0.01 nd 0.16 ± 0.01 0.02 ± 0.03 85.7 0.06 nd 0.13 0.02
  1. nd not detectable