Table 3.

Linear regression parameters of surface and bulk composition with digestibility and wettability of pretreated biomass

Parameters		% of theoretical maximum glucose yielda				Initial water contact angle (°)
		t test of regressionb		Pearson’s correlation		t test of regressionb		Pearson’s correlation
		p value	Trend	R	Trend	p value	Trend	R	Trend
Surfacec	Hemicellulose	<0.001	Strong	−0.883	Strong negative relationship	0.003	Strong	0.876	Strong positive relationship
	Lignin	0.034	Weak	−0.477	Possible negative relationship	0.076	None	0.431	No significant relationship
	Wax	0.081	None	−0.521	Possible negative relationship	0.007	Strong	0.801	Strong positive relationship
Bulkd	Cellulose	0.025	Weak	0.760	Strong positive relationship	0.018	Weak	−0.723	Strong negative relationship
	Hemicellulose	0.086	None	−0.215	No significant relationship	0.652	None	0.104	No significant relationship
	Lignin	0.044	Weak	−0.586	Possible negative relationship	0.008	Strong	0.829	Strong positive relationship
	Hemicellulose removal	0.072	None	0.347	No significant relationship	0.427	None	−0.136	No significant relationship

^aBased on glucose release after 72 h enzymatic hydrolysis at 10 mg/g dosage

^b t test of the regression slope is significant if p value <0.05

^cBased on ATR-FTIR data (peak area ratio relative to holocellulose)

^dBased on composition analysis data (% w/w DM) for glucan (cellulose), arabino-/xylan (hemicellulose), lignin (AIL and ASL), and arabinose + xylose (hemicellulose) removal