During the AD incubation, the positive control (cellulose paper)
exhibited 74.1 4.8% conversion. For plastarch, the carbon conversion
rate to biogas was similar to the positive control (cellulose
paper) for the first 7 days (Fig. 5). However, after this period, the
rate of conversion slowed as compared to the positive control
through day 28. In contrast, no significant mineralization was
observed for the plastics containing additive samples over the
entire period of the study.