The final cumulative carbon conversion during AD for plastarch
and co-polyester þ corn-based plastic were 26.4 3.5 and
20.2 4.4%, respectively. The final conversion values for PP þ 2%
additive and PETE þ 1% additive were 3.1 3.7 and 2.2 1.6%,
respectively. The ANOVA indicated that statistically significant
differences in the extent of biodegradation (F5,12 ¼ 50.7, P < 0.0001)
existed between group means. The TukeyeKramer HSD analysis
revealed that the bio-based plastics were significantly different
than the positive control but not different from each other. There
was no significant difference in the carbon conversion of the
negative control (PP) and the plastic containing the additive.