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Biodegradation of polyester-amides using a pure strain of micro-organisms or papain. I. Model compounds

par Dupret, Isabelle ;David, Christiane ;Daro, Arlette
Référence Polymer degradation and stability, 67, 3, page (497-504)
Publication Publié, 2000-03

Article révisé par les pairs

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Résumé :

Various amides and model compounds derived from phenylalanine and succinic acid have been degraded in abiotic and biotic conditions as a first step in the study of the mechanism, rate and extend of mineralization of polyesteramides. These compounds have been incubated in the presence of pure strains of micro-organisms isolated from an industrial compost for household refuse. The rate of substrate disappearance has been measured by UV absorption spectroscopy or determined from oxygen consumption data as a function of time. Attention has been paid to the configuration of the amino-acid and to the nature of the terminal groups. It has been shown that the decay of such compounds is due to the presence of amino-acid and not to the nature of the end groups. N-Succinyl-L-phenylalanine HOOC-CH(CH2-Ph)-NH-CO-(CH2)2-COOH has been demonstrated to be very rapidly mineralized while the corresponding dimeric compound N,N′-Succinyl-L,L-phenylalanine HOOC-CH(CH2-Ph)-NH-CO-(CH2)2-CO-NH-CH(CH2-Ph)-COOH was much more slowly degraded, most probably because of its larger size. The difference between the biodegradation processes mediated by micro-organisms and by isolated enzymes is emphasized.