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Isolation and screening of biopolymer-degrading microorganisms from northern Thailand

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Abstract

Forty agricultural soils were collected from Chiang Mai and Lampang provinces in northern Thailand. Bacteria, actinomycetes and fungi were isolated and screened for their ability to degrade polylactic acid (PLA), polycaprolactone (PCL) and poly(butylene succinate) (PBS) by the agar diffusion method. Sixty-seven actinomycetes, seven bacteria and five fungal isolates were obtained. The majority of actinomycetes were Streptomyces based on morphological characteristic, chemotaxonomy and 16S rRNA gene data. Seventy-nine microorganisms were isolated from 40 soil samples. Twenty-six isolates showed PLA-degradation (32.9 %), 44 isolates showed PBS-degradation (55.7 %) and 58 isolates showed PCL-degradation (73.4 %). Interestingly, 16 isolates (20.2 %) could degrade all three types of bioplastics used in this study. The Amycolatopsis sp. strain SCM_MK2-4 showed the highest enzyme activity for both PLA and PCL, 0.046 and 0.023 U/mL, respectively. Moreover, this strain produced protease, esterase and lipase on agar plates. Approximately, 36.7 % of the PLA film was degraded by Amycolatopsis sp. SCM_MK2-4 after 7 days of cultivation at 30 °C in culture broth.

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Acknowledgments

This research was supported by The Royal Golden Jubilee Ph.D. Program (PHD/0142/2553). The National Research University Project under Thailand’s Office of the Higher Education Commission and The Graduate School, Chiang Mai University are thankfully acknowledged. The authors wish to thank Dr. Robert J. McGovern (The Graduate School, Chiang Mai University, Chiang Mai, Thailand) for valuable comments and improving the English text.

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Correspondence to Saisamorn Lumyong.

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Penkhrue, W., Khanongnuch, C., Masaki, K. et al. Isolation and screening of biopolymer-degrading microorganisms from northern Thailand. World J Microbiol Biotechnol 31, 1431–1442 (2015). https://doi.org/10.1007/s11274-015-1895-1

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  • DOI: https://doi.org/10.1007/s11274-015-1895-1

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