Sequentially theester bonds of the urethane groups (H2N-CO-OR) at 1715 cm−1 could be broken by the hydrolytic effects of microbial esterases.PUR breakdown products were analyzed by FTIR using Cory-nebacterium sp. and reported that PUR degradation was causedby the hydrolysis of ester bonds (Fig. 5) (Kay et al., 1993).
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