Effect of Extruder Screw Speed, Temperature, and Enzyme Levels on Sugar Recovery from Different Biomasses

Table 3

Effect of screw speed and temperature on sugar recovery from switchgrass.

Screw speed, rpm

Temperature, ^°C

50

75

100

150

50

75

100

150

50

75

100

150

1 cellulase : 1 β-glucosidase

1 cellulase : 4 β-glucosidase

1 multienzyme : 1 β-glucosidase

Glucose

100

25.1^a

21.7^a

18.6^a

21.9^a

30.6^cd

31.4^c

22.8^h

27.7^f

7.6^e

12.5^bc

11.0^cd

11.2^cd

150

23.7^a

29.7^a

18.5^a

19.6^a

24.8^g

33.2^b

21.9^h

26.5^fg

11.3^cd

13.3^b

10.5^d

11.7^b-d

200

NA

27.3^a

25.1^a

28.8^a

NA

38.7^a

27.3^f

29.2^de

NA

19.7^a

10.4^d

11.4^cd

Xylose

100

19.3^a

20.3^a

15.9^a

21.0^a

16.7^bc

19.9^a

13.3^d

17.2^bc

2.5^d

8.2^a

4.2^c

6.9^b

150

19.9^a

22.9^a

17.2^a

16.6^a

13.2^d

17.1^bc

13.8^d

16.3^c

4.5^c

8.4^a

5.0^c

6.5^b

200

NA

20.9^a

22.1^a

24.0^a

NA

18.2^ab

17.2^bc

18.2^ab

NA

8.4

7.5^ab

8.1^a

Combined

100

20.4^a

19.0^a

15.7^a

19.4^a

23.2^bc

24.7^b

17.4^e

21.7^cd

5.3^d

10.2^bc

7.7^c

8.9^bc

150

19.9^a

24.2^a

16.1^a

16.5^a

18.9^e

24.9^b

17.9^e

20.7^d

8.0^bc

10.4^b

7.8^c

8.9^bc

200

NA

22.1^a

21.5^a

24.1^a

NA

28.2^a

21.7^cd

22.7^c

NA

14.0^a

8.7^bc

9.3^bc

Control: 19.4% glucose, 16.4% xylose, and 20.6% combined sugar (with 1 : 4 cellulase to β-glucosidase). Superscripts with same letter within column are not significantly different for each sugar under each enzyme combination. NA—not applicable.