Biomedical Engineering Reference
In-Depth Information
6.4
PLA standards
Least squares approximation
5.4
4.4
3.4
2.4
11
12
13
14
15
16
17
18
Retention time (min)
Figure 12.11
Standards of molecular weight versus retention time, and the least-squares
approximation which fi ts the standards [17].
0.12
0.11
0.1
0.09
0.08
0.07
0.06
0.05
0.04
0.03
Before cultivation
After 5 h
After 67 h
0.02
0.01
0.0
3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 6.2
log M
Figure 12.12
Weight distribution of PLA before and after enzymatic degradation. Residual
amounts of PLA after incubation for 5 and 67 h were 40% and 27%, respectively [17, 18].
