Table 3.
Recovery of glucose and xylose after pretreatment of bagasse samples at different temperature and time
| |
Conditions |
|
|
Glucose (%) |
Xylose (%) |
|||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |
Temp |
Time |
|
|
WIS |
Liquor |
WIS |
Liquor |
||||||||||||
| Run | (˚C) | (min) | pH a | log R ’ 0 | 55 | 70 | 74 | 120 | 55 | 70 | 74 | 120 | 55 | 70 | 74 | 120 | 55 | 70 | 74 | 120 |
| 1 |
180(185) |
5(4) |
2.11(2.20) |
0.94(0.91) |
95 |
96 |
97.3 |
97 |
4.9 |
3.9 |
2.5 |
2.5 |
11 |
10 |
11 |
11 |
78.5 |
67 |
66.8 |
65.9 |
| 2 |
200(205) |
5(4) |
2.05(2.11) |
1.59(1.58) |
91 |
90 |
93.9 |
95 |
8.2 |
9.1 |
5.5 |
4.6 |
7.2 |
5.1 |
4.5 |
5.9 |
71.7 |
73 |
74.7 |
65.7 |
| 3 |
180(185) |
15(14) |
2.07(2.09) |
1.46(1.56) |
92 |
90 |
94 |
93 |
7.3 |
8.5 |
5.5 |
5.7 |
6.4 |
8.2 |
4.1 |
8.6 |
79.2 |
72 |
65.7 |
60.6 |
| 4 |
200(205) |
15(14) |
2.06(2.08) |
2.06(2.16) |
89 |
86 |
88.8 |
90 |
10.6 |
11 |
8.2 |
7.7 |
3.4 |
5.1 |
3.7 |
4.1 |
61.8 |
53 |
54.1 |
36.4 |
| 5 |
176(181) |
10(9) |
2.13(2.14) |
1.10(1.20) |
95 |
95 |
96.9 |
97 |
3.8 |
4 |
2.7 |
3.2 |
5.3 |
15 |
14 |
13 |
66.7 |
76 |
69.4 |
74.4 |
| 6 |
204(209) |
10(9) |
2.08(2.10) |
1.98(2.06) |
91 |
86 |
89.6 |
93 |
7.7 |
12 |
8.5 |
5.4 |
4.9 |
4.3 |
3.7 |
7.2 |
62.5 |
58 |
59.6 |
46.3 |
| 7 |
190(195) |
3(2) |
2.06(2.15) |
1.07(0.95) |
95 |
95 |
96.2 |
97 |
4 |
5.8 |
3.6 |
2.7 |
6.8 |
7.4 |
8.2 |
13 |
84 |
74 |
69.4 |
62.8 |
| 8 |
190(195) |
17(16) |
2.06(2.08) |
1.82(1.92) |
89 |
89 |
91.3 |
94 |
9.6 |
11 |
8.1 |
7 |
4.2 |
7.4 |
4.9 |
8.1 |
67.2 |
71 |
67.8 |
47.5 |
| 9 |
190(195) |
10(9) |
2.08(2.12) |
1.57(1.63) |
90 |
91 |
92 |
93 |
7.7 |
9.4 |
6.1 |
5.5 |
4.5 |
7.8 |
5.3 |
8.6 |
75.4 |
85 |
82.6 |
78.6 |
| 10 |
190(195) |
10(9) |
2.09(2.10) |
1.56(1.65) |
93 |
92 |
94 |
95 |
7.3 |
8.7 |
6.6 |
5.2 |
4.9 |
7 |
5.7 |
7.7 |
78.2 |
83 |
77.3 |
75.9 |
| 11 | 190(195) | 10(9) | 2.07(2.11) | 1.58(1.64) | 93 | 89 | 91.6 | 95 | 7.5 | 9.8 | 6.5 | 5 | 4.9 | 7.4 | 5.7 | 7.2 | 78.4 | 79 | 77.1 | 74 |
Values are expressed as the percentage of theoretical value (content in raw material). The acid concentration at all pretreatment conditions was kept constant at 0.5% (w/w).
The conditions and values in parenthesis were employed for bagasse 120 to have a better response to pretreatment.
aThe values showing the pH for varieties 55, 70 and 74 is the average of the three substrates.
WIS, water insoluble solid; Temp, temperature; and logR ’ 0, combined severity factor.