Fungi screening and degradation characteristics for efficient poly (butylenes succinate) degradation

Abstract:

A fungal strain BFM-X1 was isolated from air environment on vegetable field, which had a strong ability to degrade poly (butylenes succinate, PBS). Morphological and phylogenetic analysis revealed that strain BFM-X1 was closely related to Bionectria ochroleuca. The optimum temperature for strain BFM-X1 degrading PBS film ranged from 25 °C to 30 °C and the initial pH of medium was 4.0. A high degradation rate for PBS film was observed with glucose, glycerole, soybean oil or PBS emulsion as a single carbon source for this strain. The curve of PBS film degradation rate with the increase of the PBS emulsion concentration showed a resupinate “U”, and the optimum PBS emulsion concentration was 1 g/L. Three phases were exhibited during PBS degradation by BFM-X1. Scanning electron micrographs showed that the surface of PBS film firstly became rough, then some holes appeared on the PBS film and the PBS film gradually disintegrated, at last the PBS film completely degraded.