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Wang X, Le B, Na Z, Bak KH, Zhang Y, Fu Y. Off‐flavor compounds in collagen peptides from fish: Formation, detection and removal. Int J Food Sci Technol 2022. [DOI: 10.1111/ijfs.15962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xilong Wang
- College of Food Science Southwest University Chongqing 400715 China
| | - Bei Le
- College of Food Science Southwest University Chongqing 400715 China
| | - Zhang Na
- Key Laboratory of Food Science and Engineering of Heilongjiang Province, College of 4Food Engineering Harbin University of Commerce Harbin 150076 China
| | - Kathrine H. Bak
- Institute of Food Safety Food Technology and Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinärplatz 1 1210 Vienna Austria
| | - Yuhao Zhang
- College of Food Science Southwest University Chongqing 400715 China
- Chongqing Key Laboratory of Speciality Food Co‐Built by Sichuan and Chongqing Chongqing 400715 China
| | - Yu Fu
- College of Food Science Southwest University Chongqing 400715 China
- Chongqing Key Laboratory of Speciality Food Co‐Built by Sichuan and Chongqing Chongqing 400715 China
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Nguyen TM, Ha PT, Le TTH, Phan KS, Le TNC, Mai TTT, Hoang PH. Modification of expanded clay carrier for enhancing the immobilization and nitrogen removal capacity of nitrifying and denitrifying bacteria in the aquaculture system. J Biosci Bioeng 2022; 134:41-47. [PMID: 35589487 DOI: 10.1016/j.jbiosc.2022.04.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 04/06/2022] [Accepted: 04/12/2022] [Indexed: 10/18/2022]
Abstract
In aquaculture systems, the treatment of nitrogen pollution has always been a center of attention due to its impact on productiveness. The bioremediation method based on simultaneous nitrification and denitrification was often used to effectively remove ammonium, nitrite, and nitrate compounds. In addition, the attachment and biofilm formation of the nitrogen-converting bacteria on carriers had superior removal efficiency over the suspended bacteria. Thus, this study focused on the fabrication of a porosity floatable expanded clay (EC) carrier that provided the basic structure for the immobilization of the nitrifiers Nitrosomonas sp., Nitrobacter sp., and the denitrifier Bacillus sp. The EC was also coated with alginate and essential nutrient to support the cohesion and growth of bacteria. Especially, the selected Bacillus sp. previously proved was able to reduce nitrite/nitrate in aerobic conditions. The co-immobilization of these three aerobic bacteria on the prepared carrier would simply the treatment process in practical use. Initial results showed that the integration of essential nutrients (N, P, K) on alginate coated EC (EC_Alg_N) increased bacterial density to (57 ± 3) × 107 - (430 ± 30) × 108 CFU/g, which then led to the enhancement of removal efficiency up to 91.62 ± 0.67% in the medium containing initial nitrogen content of 60 mg-N/L. The nitrogen removal efficacy of bacterial immobilized EC_Alg_N remained at 83.95 ± 0.15% after being reused for 6 cycles. In conclusion, the bacterial immobilized EC_Alg_N could be a potential material for nitrogen polluted wastewater treatment in aquaculture systems.
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Affiliation(s)
- Thi Minh Nguyen
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100000, Viet Nam; Institute of Biotechnology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100000, Viet Nam.
| | - Phuong Thu Ha
- Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100000, Viet Nam.
| | - Thi Thu Huong Le
- Vietnam National University of Agriculture, Trau Quy, Gia Lam District, Hanoi 100000, Viet Nam.
| | - Ke Son Phan
- Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100000, Viet Nam.
| | - Thi Nhi Cong Le
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100000, Viet Nam.
| | - Thi Thu Trang Mai
- Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100000, Viet Nam.
| | - Phuong Ha Hoang
- Institute of Biotechnology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100000, Viet Nam.
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Cai Z, Zhou L, Liu L, Wang D, Ren W, Long H, Zhang X, Xie Z. Bacterial epiphyte and endophyte communities of seagrass Thalassia hemprichii: the impact of feed extract solution. ENVIRONMENTAL MICROBIOLOGY REPORTS 2021; 13:757-772. [PMID: 34713580 DOI: 10.1111/1758-2229.13019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 09/05/2021] [Accepted: 10/12/2021] [Indexed: 06/13/2023]
Abstract
The global seagrass bed ecosystem acts as a natural ecological barrier in the littoral coastal zone. In recent years, this ecosystem has suffered from serious eutrophication and destruction caused by the continuous expansion of aquaculture. However, our understanding of the influence of aquaculture on the bacterial community remains limited. In this study, we used 16S amplicon sequencing to evaluate the impact of aquaculture feed extract solution on the composition and function of bacterial epiphytes and endophyte communities of the core seagrass from the seagrass bed ecosystem in Hainan, Thalassia hemprichii. The feed extract solution was the main factor that significantly affected the bacterial epiphyte and endophyte community structure of seagrass leaves but had no marked effect on alpha diversity was observed. Additionally, the bacterial epiphyte and endophyte community of the T. hemprichii leaves alleviated the effects of organic matter, sulfide, and nutrients caused by aquaculture wastewater. The feed extract solution promoted the proliferation of Bacteroidales, Vibrio, Desulfobulbaceae, Desulfobacteraceae, Pseudoalteromonas, Paludibacter, Marinomonas, and Pseudomonas in the leaves and root of T. hemprichii, which can effectively improve the digestibility of eutrophication. In fact, Desulfobacteraceae and Desulfobulbaceae can reduce sulfate to sulfide and oxidize sulfide to sulfur within seagrass, indicating that the increase in Desulfobulbaceae and Desulfobacteraceae facilitated the accumulation of sulfide with the treatment of feed extract solution, which may be the reason for the degradation of seagrass caused by aquaculture wastewater containing high concentrations of organic pollutants. These results suggest that although seagrass beds can withstand low concentrations of aquaculture pollutants, sulfide emissions should be minimized.
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Affiliation(s)
- Zefu Cai
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, 570228, China
- Hainan Academy of Ocean and Fisheries Sciences, Haikou, Hainan Province, 571126, China
- Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, Hainan University, Haikou, Hainan Province, 570228, China
- College of Marine Sciences, Hainan University, Haikou, Hainan Province, 570228, China
| | - Lei Zhou
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, 570228, China
- Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, Hainan University, Haikou, Hainan Province, 570228, China
- College of Marine Sciences, Hainan University, Haikou, Hainan Province, 570228, China
| | - Lihua Liu
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, 570228, China
- Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, Hainan University, Haikou, Hainan Province, 570228, China
- College of Marine Sciences, Hainan University, Haikou, Hainan Province, 570228, China
| | - Daoru Wang
- Hainan Academy of Ocean and Fisheries Sciences, Haikou, Hainan Province, 571126, China
| | - Wei Ren
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, 570228, China
- Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, Hainan University, Haikou, Hainan Province, 570228, China
- College of Marine Sciences, Hainan University, Haikou, Hainan Province, 570228, China
| | - Hao Long
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, 570228, China
| | - Xiang Zhang
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, 570228, China
- Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, Hainan University, Haikou, Hainan Province, 570228, China
- College of Marine Sciences, Hainan University, Haikou, Hainan Province, 570228, China
| | - Zhenyu Xie
- State Key Laboratory of Marine Resource Utilization in the South China Sea, Hainan University, Haikou, Hainan Province, 570228, China
- Hainan Provincial Key Laboratory for Tropical Hydrobiology and Biotechnology, Hainan University, Haikou, Hainan Province, 570228, China
- College of Marine Sciences, Hainan University, Haikou, Hainan Province, 570228, China
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El-Sesy ME, Ibrahim SS. Application of central composite design approach for optimization nitrate removal from aqueous solution by immobilized Pseudomonas putida. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2021; 83:2931-2946. [PMID: 34185690 DOI: 10.2166/wst.2021.190] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
High nitrate concentration is a dangerous pollutant in the environment. Immobilization for the optimum denitrifying bacterial strain isolated from collected wastewater samples was suggested for bioremediation of excessive nitrate concentration from aqueous solutions and its denitrification activity under different pH, nitrate concentration, bacterial beads, temperature and sodium alginate concentration conditions was explored. The active isolate was identified as Pseudomonas putida MT364822.1 by 16S rRNA analysis. Nitrate bioremediation process was optimized by applying response surface methodology based on central composite design approach. Nitrate uptake was significantly affected by variables of study (P-value <0.05). Maximum removal of nitrate (91.1%) was achieved at pH 7, nitrate concentration 400 mg/L, immobilized bacterial beads 3.0 g/L, temperature 35 °C and sodium alginate concentration 2.5% as optimal variable values. For application, immobilized P. putida MT364822.1 removed 82.2% of nitrate from raw fish farm effluent. Storage and reusability experiments showed that the immobilized strain stronger and more stable than the pure strain. The results suggested that immobilized P. putida MT364822.1 is a highly promising and suitable microorganism for use in the bio-removal of nitrate, and the central composite design was more effective in optimizing variables to achieve the best nitrate removal efficiency.
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Affiliation(s)
- Marwa E El-Sesy
- Microbiology Department, Central Laboratory for Environmental Quality Monitoring, National Water Research Center, Cairo, Egypt and Inorganic Chemistry Department, Central Laboratory for Environmental Quality Monitoring, National Water Research Center, Cairo, Egypt E-mail:
| | - Sabah S Ibrahim
- Microbiology Department, Central Laboratory for Environmental Quality Monitoring, National Water Research Center, Cairo, Egypt and Inorganic Chemistry Department, Central Laboratory for Environmental Quality Monitoring, National Water Research Center, Cairo, Egypt E-mail:
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