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Mechanism prediction of the synergistic degradation of polyacrylamide by Trichoderma asperellum and Aspergillus flavus
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Jia LI1, Zhenjiang JIN1, 2, 3, 4, 5, *, Zhangheng HU1, Shixuan WANG1, Ting LUO1, Chengxi YANG1, Chen FAN1
Acta Microbiologica Sinica | 2025, 65(12) : 5309 - 5324
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Acta Microbiologica Sinica | 2025, 65(12): 5309-5324
• Research Article •
Mechanism prediction of the synergistic degradation of polyacrylamide by Trichoderma asperellum and Aspergillus flavus
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Jia LI1, Zhenjiang JIN1, 2, 3, 4, 5, *, Zhangheng HU1, Shixuan WANG1, Ting LUO1, Chengxi YANG1, Chen FAN1
Affiliations
  • 1.College of Environmental Science and Engineering, Guilin University of Technology, Guilin, Guangxi, China
  • 2.Collaborative Innovation Center for Water Pollution Control and Water Security in Karst Regions, Guilin University of Technology, Guilin, Guangxi, China
  • 3.Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, Guangxi, China
  • 4.Guangxi Modern Industrial College of Ecological Environmental Protection, Guilin, Guangxi, China
  • 5.Guangxi Engineering Research Center for Basin Protection and Green Development, Guilin University of Technology, Guilin, Guangxi, China
Published: 2025-12-04 doi: 10.13343/j.cnki.wsxb.20250301
Outline
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Objective Screening fungi with the ability to degrade polyacrylamide (PAM) and analyzing the characteristics of their degradation products can provide a basis for clarifying the degradation mechanism. Methods Fungi capable of degrading PAM were screened from bauxite sludge and used to construct a composite fungal community, with the degradation products and morphological characteristics being determined under optimized conditions. Results The results showed that the three strains of fungi screened out were Trichoderma asperellum, Aspergillus flavus, and Aspergillus niger, which showed the degradation rates of 27.35%, 25.20%, and 23.04%, respectively, for PAM. The degradation conditions were optimized by the response surface method as initial pH 5.5, inoculum amount of 5.1%, and incubation temperature of 32 ℃, under which the fungal complex constructed with T. asperellum and A. flavus showed the PAM degradation rate of 45.44%, a viscosity reduction rate of 84.57%, and laccase and urease activities of 13.90 U/mL and 17.70 U/mL, respectively. A large number of hollows and cavities were formed on the surface of PAM after degradation. In addition, mycelial biofilm was observed on the surface. The degradation products showed -COOH and -OH functional groups. Conclusion The above results suggest that the fungal complex may degrade PAM into small molecules through the synergistic effects of mycelial physical erosion and extracellular enzymes.

polyacrylamide degradation  /  fungi  /  laccase  /  urease
Jia LI, Zhenjiang JIN, Zhangheng HU, Shixuan WANG, Ting LUO, Chengxi YANG, Chen FAN. Mechanism prediction of the synergistic degradation of polyacrylamide by Trichoderma asperellum and Aspergillus flavus[J]. Acta Microbiologica Sinica, 2025 , 65 (12) : 5309 -5324 . DOI: 10.13343/j.cnki.wsxb.20250301
Funding
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  • National Natural Science Foundation of China(42367017)
Appendix
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Year 2025 volume 65 Issue 12
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218
93
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Article Info
doi: 10.13343/j.cnki.wsxb.20250301
  • Receive Date：2025-04-11
  • Online Date：2025-12-08
  • Published：2025-12-04
Article Data
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History
  • Received：2025-04-11
  • Accepted：2025-07-25
Funding
National Natural Science Foundation of China(42367017)
Affiliations
    1.College of Environmental Science and Engineering, Guilin University of Technology, Guilin, Guangxi, China
    2.Collaborative Innovation Center for Water Pollution Control and Water Security in Karst Regions, Guilin University of Technology, Guilin, Guangxi, China
    3.Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, Guangxi, China
    4.Guangxi Modern Industrial College of Ecological Environmental Protection, Guilin, Guangxi, China
    5.Guangxi Engineering Research Center for Basin Protection and Green Development, Guilin University of Technology, Guilin, Guangxi, China

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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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