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首页> 外文期刊>journal of applied polymer science >Biodegradation of radiolabeled cellulose acetate and cellulose propionate
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Biodegradation of radiolabeled cellulose acetate and cellulose propionate

机译：Biodegradation of radiolabeled cellulose acetate and cellulose propionate

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AbstractBiodegradation of cellulose acetate and cellulose propionate was conclusively established with a naturally derived mixed microbial culture derived from activated sludge and14C labeled cellulose esters. Radiolabeled cellulose esters were synthesized with either 1‐14C‐acetate or 1‐14C‐propionate and back hydrolyzed to the desired degree of substitution (DS) ranging from 1.77 to 2.64. Biodegradation was measured in anin vitroaerobic culture system that was designed to capture14CO2produced by the aerobic microbial metabolism of the cellulose esters. Microorganisms were able to extensively degrade cellulose 1‐14C‐acetate (CA) with DS ranging from 1.85 to 2.57 over periods of 14–31 days. More than 80 of the original14C‐polymeric carbon was biodegraded to14CO2for CA substrates with a DS of 1.85. CA polymers with a DS of 2.07 and 2.57 yielded over 60 conversion to14CO2. The amount of biodegradation that was observed with cellulose 1‐14C‐propionate with DS of 2.11, 2.44, and 2.64 were lower than the corresponding acetyl ester and ranged from 0.09 to 1.1. However, cellulose 1‐14C‐propionate with a DS of 1.77 and 1.84 underwent very rapid degradation in the mixed culture system, with 70 to over 80 conversion of labeled polymeric carbon metabolized to14CO2in 29 days. The high level of microbial utilization of carbon from both cellulose esters and its conversion to CO2confirms the biodegradability of these polymers and the potential they have for total mineralization in natural microbiologically active environments. © 1

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