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Bioresources and Bioprocessing

Table 4 Model parameters (ai), standard errors (SE), and significance level (p) for the mathematical models

From: Optimisation of sugar and solid biofuel co-production from almond tree prunings by acid pretreatment and enzymatic hydrolysis

Response variable

ai

SE

p-value (Prob > F)

R2

R2adjust

TGR, %

a0: 57.380

0.109

1.96·10–19

0.967

0.959

 

a1: –1.679

0.128

1.10·10–6

 
 

a2: –1.036

0.128

4.08·10–5

 

Yglucose(1)

a0: 4.438

0.159

1.91·10–8

0.934

0.906

 

a1: –0.913

0.133

2.43·10–4

 
 

a2: –0.386

0.133

2.31·10–2

 
 

a3: –1.007

0.152

2.95·10–4

 

Yxylose(1)

a0: 14.22

0.210

6.94·10–10

0.994

0.989

 

a1: –2.556

0.128

1.05·10–6

 
 

a2: –1.434

0.128

3.09·10–5

 
 

a3: –2.982

0.153

1.18·10–6

 
 

a5: –1.717

0.153

2.98·10–5

 

Yarabinose(1)

a0: 2.420

0.050

4.98·10–9

0.987

0.978

 

a1: –0.260

0.030

1.38·10–4

 
 

a2: 0.310

0.030

5.14·10–5

 
 

a3: –0.461

0.036

1.43·10–5

 
 

a5: –0.509

0.036

8.05·10–6

 

YTMS(1)

a0: 22.007

0.389

2.04·10–9

0.991

0.985

 

a1: –4.006

0.238

2.81·10–6

 
 

a2: –2.185

0.238

9.40·10–5

 
 

a3: –4.712

0.283

3.01·10–6

 
 

a4: –2.196

0.283

2.42·10–4

 
  1. Total gravimetric recovery (TGR), glucose yield (YGlucose), xylose yield (YXylose), arabinose yield (YArabinose) and total monomeric sugars yield (YTMS) for the sulphuric acid pretreatment of almond tree prunings
  2. Significance level was defined as p < 0.05
  3. (1) Products yields are expressed as grams of product per 100 g of dry raw material
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