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Characterization of Streptomyces species with poly(3-hydroxybutyrate) degradation capabilities isolated from rice field soil
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Chhetri, Geeta
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Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea

Jeon, Jong-Min
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Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea

Kim, Hyun-Joong
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Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea

Choi, Tae-Rim
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Konkuk Univ, Coll Engn, Dept Biol Engn, Adv Mat Program, Seoul 05029, South Korea Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea

Yang, Yung-Hun
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Konkuk Univ, Coll Engn, Dept Biol Engn, Adv Mat Program, Seoul 05029, South Korea Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea

Yoon, Jeong-Jun
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Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea
机构:
[1] Korea Inst Ind Technol KITECH, Green Circulat R&D Dept, Cheonan 31056, South Korea
[2] Konkuk Univ, Coll Engn, Dept Biol Engn, Adv Mat Program, Seoul 05029, South Korea
关键词:
Bio-plastic;
Poly(3-hydroxybutyrate);
Polyphasic;
Pigment;
rice field soil;
MICROBIAL-DEGRADATION;
BIODEGRADATION;
POLYHYDROXYALKANOATES;
POLYETHYLENE;
FEATURES;
DATABASE;
D O I:
10.1016/j.ijbiomac.2025.141795
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
The shift towards sustainable alternatives to petroleum-based polymers has become essential for addressing environmental challenges. Among these alternatives, bio-plastics such as poly(3-hydroxybutyrate) (PHB) have gained considerable attention due to their biodegradability into water and carbon dioxide through microbial activity. PHB is one of the most widely commercialized bio-plastics. However, its excessive accumulation in the environment due to insufficient degradation remains a significant ecological concern. This study focused on isolating and characterizing PHB-degrading bacteria from soil samples collected from rice fields. Screening led to the identification of five PHB-degrading bacterial strains belonging to different genera. Among these, Streptomyces sp. AG7 and Streptomyces sp. RG41 were identified as the most effective PHB degraders. Their PHBdegrading abilities were evaluated in shake-flask cultures using PHB films as substrates. After 20 days of incubation at 37 degrees C, Streptomyces sp. AG7 and Streptomyces sp. RG41 achieved PHB degradation rates of approximately 74.7 % and 68.5 %, respectively. Additionally, both strains demonstrated the ability to produce indole-3acetic acid (IAA), a key phytohormone that promotes plant growth, and exhibited phosphate-solubilizing activity, which enhances nutrient availability. Further analysis using scanning electron microscopy (SEM) revealed structural changes in the PHB films, while gel permeation chromatography (GPC) confirmed significant alterations in the polymer's molecular properties. These findings highlight the potential of utilizing soil-derived Streptomyces species for sustainable PHB waste management, in order to promote plant growth, improve soil fertility through phosphate solubilization, and contribute to agricultural sustainability.
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