Release of cell wall phenolic esters during hydrothermal pretreatment of rice husk and rice straw

Table 2 Quantification of total phenolic compounds extracted from the solids of untreated and pretreated (severity 1.57) RH and RS

Severity	Total (mono) phenolics (mg/g of raw materials)
	Rice husk				Rice straw
	1 Mol NaOH		4 Mol NaOH		1 Mol NaOH		4 Mol NaOH
Raw	14.57	± 0.57	15.82	± 1.41	14.37	± 0.45	17.20	± 1.57
1.57	15.90	± 0.44	15.96	± 1.21	16.23	± 0.78	14.24	± 0.83

Untreated and pretreated samples were saponified with 1 Mol NaOH and 4 Mol NaOH separately before analysis by HPLC
Results were calculated as mg/g of original lignocellulosic raw materials. n = 3

ISSN: 2731-3654