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Production of polyhydroxybutyrate (PHB) by a novel Klebsiella pneumoniae strain using low-cost media from fruit peel residues

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Abstract

Plastics are widely used for various applications. Once discarded, it is commonly known that they represent a high environmental threat due to their slow degradation; for this reason, there is an imminent need to replace these products with eco-friendlier ones. In the present work, four bacterial polyhydroxybutyrate (PHB) producers, two consortia, and two isolated strains were successfully recovered from the facilities of a paper-manufacturing industry. Spectroscopic studies of the biopolymers obtained from these bacteria corroborated their PHB production capabilities, ranging from 4.04 ± 0.16 to 23.82 ± 3.39 g/L. The characterization of the isolate that presented the highest production yield initially coded as E22 led to the identification of a Klebsiella pneumoniae strain, which, compared with other PHA bacterial producers reported to date, could be considered with high production potential. The strain E22 was grown in 5 different media prepared from fruit peel residues of banana, orange, papaya, watermelon, and melon, to determine its growth and PHA production capabilities in these low-cost media. The results obtained show different bacterial growth yields among the media tested, although PHB production yields and productivities were similar in all these low-cost media. Cellular accumulation of the biopolymer was higher in watermelon peel medium (8.4 × 10−10 g/CFU). These results reveal the potential of K. pneumoniae E22 for PHB production applications and establish encouraging alternatives to be broader explored regarding low-cost media that could enhance the scale-up of bacterial PHA production processes.

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Acknowledgments

We deeply thank Prof. Gilberto José López de la Mora, Coordinator of the Scientific Illustration Program of the Universidad Tecnológica de la Zona Metropolitana del Valle de México, for his valuable assistance in the elaboration of the graphical abstract. Biochemical characterization of strain E22 was performed in Acosta Group—Laboratories, in Tizayuca, Hgo., Mexico.

Funding

This project was supported by the budget from the Annual Operational Program assigned to the Universidad Tecnológica de la Zona Metropolitana del Valle de México for Scientific, Technological, and Educational Research Projects, item numbers 251001 and 255001 for years 2017 and 2018.

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Valdez-Calderón, A., Barraza-Salas, M., Quezada-Cruz, M. et al. Production of polyhydroxybutyrate (PHB) by a novel Klebsiella pneumoniae strain using low-cost media from fruit peel residues. Biomass Conv. Bioref. 12, 4925–4938 (2022). https://doi.org/10.1007/s13399-020-01147-5

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