1
|
Tao X, Chen X, Dong R, Wang G, Xu X, Yu Q, Chen Y, Wang X, Xie J. Characterization and antioxidant properties of three exopolysaccharides produced by the Cyclocarya paliurus endophytic fungus. Int J Biol Macromol 2024; 271:132110. [PMID: 38816295 DOI: 10.1016/j.ijbiomac.2024.132110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 04/26/2024] [Accepted: 05/03/2024] [Indexed: 06/01/2024]
Abstract
In recent years, the considerable potential of endophytic bacteria and fungi as prolific producers of exopolysaccharides (EPSs) have attracted interest. In this study, 56 endophytes were isolated from Cyclocarya paliurus, and the secondary metabolites of EPSs were extracted from Monascus purpureus, Penicillium citrinum and Aspergillus versicolor, screened, and named MPE, PCE and AVE, respectively. In this work, the physicochemical properties and antioxidant activities of three EPSs, their cell proliferation activity on IEC-6 and RAW264.7 were investigated. The three EPSs were mainly composed of neutral sugar and differ in microstructure. However, MPE had a loose structure, and PCE exhibited a dense and sheet-like structure. In addition, the three EPSs performed ordinary antioxidant activity in vitro but showed excellent cell proliferation activity on IEC-6 and RAW264.7. The cell proliferation activity of PCE was 1.4-fold that of the controls at a concentration of 800 μg/mL on IEC-6, and MPE exhibited 1.3-fold increase on RAW264.7. This study provided scientific evidence and insights into the application of endophytes as a novel plant resource possessing huge application potential.
Collapse
Affiliation(s)
- Xin Tao
- State Key Laboratory of Food Science and Resources, Nanchang University, No. 235 Nanjing East Road, Nanchang 330047, China
| | - Xianxiang Chen
- State Key Laboratory of Food Science and Resources, Nanchang University, No. 235 Nanjing East Road, Nanchang 330047, China
| | - Ruihong Dong
- State Key Laboratory of Food Science and Resources, Nanchang University, No. 235 Nanjing East Road, Nanchang 330047, China
| | - Gang Wang
- State Key Laboratory of Food Science and Resources, Nanchang University, No. 235 Nanjing East Road, Nanchang 330047, China
| | - Xizhe Xu
- State Key Laboratory of Food Science and Resources, Nanchang University, No. 235 Nanjing East Road, Nanchang 330047, China
| | - Qiang Yu
- State Key Laboratory of Food Science and Resources, Nanchang University, No. 235 Nanjing East Road, Nanchang 330047, China
| | - Yi Chen
- State Key Laboratory of Food Science and Resources, Nanchang University, No. 235 Nanjing East Road, Nanchang 330047, China
| | - Xufeng Wang
- State Key Laboratory of Food Science and Resources, Nanchang University, No. 235 Nanjing East Road, Nanchang 330047, China
| | - Jianhua Xie
- State Key Laboratory of Food Science and Resources, Nanchang University, No. 235 Nanjing East Road, Nanchang 330047, China.
| |
Collapse
|
2
|
Oliva RL, Vogt C, Bublitz TA, Camenzind T, Dyckmans J, Joergensen RG. Galactosamine and mannosamine are integral parts of bacterial and fungal extracellular polymeric substances. ISME COMMUNICATIONS 2024; 4:ycae038. [PMID: 38616925 PMCID: PMC11014887 DOI: 10.1093/ismeco/ycae038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 12/19/2023] [Accepted: 03/18/2024] [Indexed: 04/16/2024]
Abstract
Extracellular polymeric substances (EPS) are produced by microorganisms and interact to form a complex matrix called biofilm. In soils, EPS are important contributors to the microbial necromass and, thus, to soil organic carbon (SOC). Amino sugars (AS) are used as indicators for microbial necromass in soil, although the origin of galactosamine and mannosamine is largely unknown. However, indications exist that they are part of EPS. In this study, two bacteria and two fungi were grown in starch medium either with or without a quartz matrix to induce EPS production. Each culture was separated in two fractions: one that directly underwent AS extraction (containing AS from both biomass and EPS), and another that first had EPS extracted, followed then by AS determination (exclusively containing AS from EPS). We did not observe a general effect of the quartz matrix neither of microbial type on AS production. The quantified amounts of galactosamine and mannosamine in the EPS fraction represented on average 100% of the total amounts of these two AS quantified in cell cultures, revealing they are integral parts of the biofilm. In contrast, muramic acid and glucosamine were also quantified in the EPS, but with much lower contribution rates to total AS production, of 18% and 33%, respectively, indicating they are not necessarily part of EPS. Our results allow a meaningful ecological interpretation of mannosamine and galactosamine data in the future as indicators of microbial EPS, and also attract interest of future studies to investigate the role of EPS to SOC and its dynamics.
Collapse
Affiliation(s)
- Rebeca Leme Oliva
- Soil Biology and Plant Nutrition, University of Kassel, 37213 Witzenhausen, Germany
| | - Carla Vogt
- Soil Biology and Plant Nutrition, University of Kassel, 37213 Witzenhausen, Germany
| | - Tábata Aline Bublitz
- Soil Biology and Plant Nutrition, University of Kassel, 37213 Witzenhausen, Germany
| | - Tessa Camenzind
- Institute of Biology, Department of Plant Ecology, Freie Universität Berlin, 14195 Berlin, Germany
| | - Jens Dyckmans
- Centre for Stable Isotope Research Analysis, University of Göttingen, 37077 Göttingen, Germany
| | | |
Collapse
|
3
|
Mowafy AM, Khalifa S, Elsayed A. Brevibacillus DesertYSK and Rhizobium MAP7 stimulate the growth and pigmentation of Lactuca sativa L. J Genet Eng Biotechnol 2023; 21:17. [PMID: 36780046 PMCID: PMC9925635 DOI: 10.1186/s43141-023-00465-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 01/13/2023] [Indexed: 02/14/2023]
Abstract
BACKGROUND Applying microbial biostimulants during crop cultivation allows for higher sustainability levels. It reduces the need for fertilizers and environmental contaminants while enhancing plant quality. This study assessed 13 endophytic bacteria, 4 newly isolated, and 9 donated, for plant growth-promoting capabilities. Quantitative assessments of indole acetic acid (IAA), gibberellic acid (GA3), siderophores, ammonia, exopolysaccharides, volatile HCN, and phosphate solubilization, along with Bray-Curtis cluster analyses were performed. RESULTS Upon the results we selected RhizobiumMAP7, Brevibacillus DesertYSK, Pseudomonas MAP8, BacillusMAP3, Brevibacillus MAP, and Bacillus DeltaYSK to evaluate their effects on Lactuca sativa growth and pigmentation in a 30-day greenhouse pot experiment. Both Brevibacillus DesertYSK and Rhizobium MAP7surpassed other strains in growth promotional effects. They doubled shoot length (12 and 12.3 cm, respectively, when compared with 7 cm for control after 30 days), and fresh weight (0.079 and 0.084 g, respectively, when compared with 0.045 g for control after 30 days), and increased root length by at least 3-fold when compared with control (4.5 and 3.5 cm, respectively, when compared with 1.2 cm for control after 30 days). Chlorophyll content also exhibited at least a 2-fold significant increase in response to bacterization compared with control. CONCLUSIONS This strain superiority was consistent with the in vitro assays data that showed strains capability as IAA and GA3producers. Also, strains were highly capable ammonia and siderophore producers and phosphate solubilizers, providing considerable hormone and nutrient levels for L. sativa plantsleading to improved growth parameters and appearance. These data support the notion that nodule-based bacteria are potential plant growth-promoting bacteria (PGPB) that may be used on a wider scale rather than just for legumes.
Collapse
Affiliation(s)
- Amr M. Mowafy
- grid.10251.370000000103426662Botany Department, Faculty of Science, Mansoura University, Mansoura, 35516 Egypt ,grid.10251.370000000103426662Department of Biological Sciences, Faculty of Science, New Mansoura University, New Mansoura City, Egypt
| | - Sherouk Khalifa
- grid.10251.370000000103426662Botany Department, Faculty of Science, Mansoura University, Mansoura, 35516 Egypt
| | - Ashraf Elsayed
- grid.10251.370000000103426662Botany Department, Faculty of Science, Mansoura University, Mansoura, 35516 Egypt
| |
Collapse
|
4
|
Li X, Li J, Zhao Q, Qiao L, Wang L, Yu C. Physiological, biochemical, and genomic elucidation of the Ensifer adhaerens M8 strain with simultaneous arsenic oxidation and chromium reduction. JOURNAL OF HAZARDOUS MATERIALS 2023; 441:129862. [PMID: 36084460 DOI: 10.1016/j.jhazmat.2022.129862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 08/12/2022] [Accepted: 08/25/2022] [Indexed: 06/15/2023]
Abstract
This study reports the simultaneous oxidation of As(III) and reduction of the Cr(VI) strain Ensifer adhaerens M8 screened from soils around abandoned gold tailings contaminated with highly complex metals (loids). Physiological, biochemical, and genomic techniques were used to explore the mechanism. The strain M8 could simultaneously oxidize 1 mM As(III) and reduce 45.3 % 0.1 mM Cr(VI) in 16 h, and the Cr(VI) reduction rate was increased by 5.8 % compared with the addition of Cr(VI) alone. Cellular debris was the main site of M8 arsenic oxidation. Chromium reduction was dominated by the reduction of extracellular hexavalent chromium (23.80-35.67 %). The genome of M8 included one chromosome and four plasmids, and a comparison of the genomes showed that M8 had two more plasmids than strains of the same genus, which may be related to strong environmental adaptations. M8 had 10 heavy metal resistance genes (HMRs), and plasmid D had a complete cluster of arsenic resistance-oxidation-transport genes (arsOHBCCR-aioSR-aioBA-cytCmoeA-phoBBU-PstBACS-phnCDEE). The genes involved in Cr(VI) detoxification include DNA repair (RecG, ruvABC, and UvrD), Cr(VI) transport (chrA, TonB, and CysAPTW) and Cr(VI) reduction. In summary, this study provides a molecular basis for As (III) and Cr (VI) remediation.
Collapse
Affiliation(s)
- Xianhong Li
- School of Chemical & Environmental Engineering, China University of Mining & Technology Beijing, Beijing 100083, China
| | - Jingru Li
- School of Chemical & Environmental Engineering, China University of Mining & Technology Beijing, Beijing 100083, China
| | - Qiancheng Zhao
- School of Chemical & Environmental Engineering, China University of Mining & Technology Beijing, Beijing 100083, China
| | - Longkai Qiao
- School of Chemical & Environmental Engineering, China University of Mining & Technology Beijing, Beijing 100083, China
| | - Limin Wang
- School of Chemical & Environmental Engineering, China University of Mining & Technology Beijing, Beijing 100083, China
| | - Caihong Yu
- School of Chemical & Environmental Engineering, China University of Mining & Technology Beijing, Beijing 100083, China.
| |
Collapse
|
5
|
Zheng X, Xiao R, Chen M, Wu H, Gao X, Wang J. An avirulent Ralstonia solanacearum strain FJAT1458 outcompetes with virulent strain and induces tomato plant resistance against bacterial wilt. PEST MANAGEMENT SCIENCE 2022; 78:5002-5013. [PMID: 36053816 DOI: 10.1002/ps.7123] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/22/2022] [Accepted: 08/10/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Bacterial wilt (BW) caused by Ralstonia solanacearum (RS) is considered as one of the most destructive plant diseases. An avirulent strain of RS, FJAT1458, is a potential biocontrol agent of BW. In this study, the mechanism of FJAT1458 against BW was evaluated. RESULTS FJAT1458 was tagged with the red fluorescent protein gene, and the resulting strain was named as FJAT1458-RFP. When FJAT1458-RFP and FJAT91-GFP (a virulent strain of RS labelled with the green fluorescent protein gene), were co-inoculated in potted tomato plants, the colonization of FJAT91-GFP reached an almost undetectable level at 7 days post-inoculation (dpi) in the roots and at 9 dpi in rhizosphere soil. When they were co-inoculated in a hydroponic tomato growing system, numbers of the two strains were similar at 3 dpi in the root tissues; however, FJAT91-GFP was not detected at 9 dpi while FJAT1458-RFP maintained 1.77 × 105 CFU g-1 . The inoculation of FJAT1458-RFP alone or combination with FJAT91-GFP significantly increased tomato root activity. Moreover, expression levels of the defense-related genes PR-1a, GLUA, and CHI3 in tomato roots were significantly up-regulated by FJAT1458-RFP and co-inoculation of FJAT1458-RFP and FJAT91-GFP at 5 dpi, compared to the control (water, CK) treatment. Noteworthy, expression levels of GLUA in the treatments of FJAT1458-RFP and FJAT1458-RFP + FJAT91-GFP were 12.22- and 12.05-fold higher than that in the CK at 5 dpi, respectively. CONCLUSIONS The results suggested that the avirulent strain FJAT1458-RFP could suppress colonization of the virulent strain in tomato roots, and induce tomato plant resistance against BW. © 2022 Society of Chemical Industry.
Collapse
Affiliation(s)
- Xuefang Zheng
- Agricultural Bio-Resources Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou, China
| | - Rongfeng Xiao
- Agricultural Bio-Resources Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou, China
| | - Meichun Chen
- Agricultural Bio-Resources Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou, China
| | - Huijun Wu
- Key Laboratory of Integrated and Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xuewen Gao
- Key Laboratory of Integrated and Management of Crop Diseases and Pests, Ministry of Education, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jieping Wang
- Agricultural Bio-Resources Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou, China
| |
Collapse
|
6
|
The production and application of bacterial exopolysaccharides as biomaterials for bone regeneration. Carbohydr Polym 2022; 291:119550. [DOI: 10.1016/j.carbpol.2022.119550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 04/19/2022] [Accepted: 04/26/2022] [Indexed: 11/18/2022]
|
7
|
Bajire SK, Jain S, Johnson RP, Shastry RP. 6-Methylcoumarin attenuates quorum sensing and biofilm formation in Pseudomonas aeruginosa PAO1 and its applications on solid surface coatings with polyurethane. Appl Microbiol Biotechnol 2021; 105:8647-8661. [PMID: 34750645 DOI: 10.1007/s00253-021-11637-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 09/23/2021] [Accepted: 10/05/2021] [Indexed: 11/27/2022]
Abstract
Quorum sensing mediated biofilm formation has a major role in modern therapeutics due to adherence of cells on the solid surface. Here, we have developed a stable polyurethane blend with a 6-methylcoumarin (6-MC) composite that showed significant antibiofilm activity. The 6-MC was found to prominently inhibit P. aeruginosa PAO1 biofilm formation at 125 μg/ml and was able to inhibit various virulence factors such as pyocyanin, siderophore, exopolysaccharide, elastase and proteases, including motility of the bacteria. In addition, 6-MC was found functionally active in saving the C. elegans from P. aeruginosa PAO1 infection. Moreover, docking studies of different activator proteins correlate well with in vitro and in vivo results. To enhance this biological activity, 6-MC was blended with polyurethane, which also revealed superior antibiofilm activity on plastic and glass surfaces compared to a polyurethane coating. Therefore, the 6-MC could be used to combat P. aeruginosa infection for effective treatment and antibiofilm applications on solid surfaces through polyurethane blending and subsequent film fabrication strategies. KEY POINTS: • 6-Methylcoumarin significantly inhibits P. aeruginosa PAO1 biofilm • 6-MC was found functionally active in saving the C. elegans from PAO1 infection • 6-MC and polyurethane blend showed superior antibiofilm activity.
Collapse
Affiliation(s)
- Sukesh Kumar Bajire
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to be University), University Road, Mangalore, 575018, India
| | - Supriya Jain
- Polymer Nanobiomaterial Research Laboratory, Yenepoya Research Centre, Yenepoya (Deemed to be University), University Road, Mangalore, 575018, India
| | - Renjith P Johnson
- Polymer Nanobiomaterial Research Laboratory, Yenepoya Research Centre, Yenepoya (Deemed to be University), University Road, Mangalore, 575018, India
| | - Rajesh P Shastry
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to be University), University Road, Mangalore, 575018, India.
| |
Collapse
|
8
|
Hinchliffe JD, Parassini Madappura A, Syed Mohamed SMD, Roy I. Biomedical Applications of Bacteria-Derived Polymers. Polymers (Basel) 2021; 13:1081. [PMID: 33805506 PMCID: PMC8036740 DOI: 10.3390/polym13071081] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 03/23/2021] [Accepted: 03/24/2021] [Indexed: 12/12/2022] Open
Abstract
Plastics have found widespread use in the fields of cosmetic, engineering, and medical sciences due to their wide-ranging mechanical and physical properties, as well as suitability in biomedical applications. However, in the light of the environmental cost of further upscaling current methods of synthesizing many plastics, work has recently focused on the manufacture of these polymers using biological methods (often bacterial fermentation), which brings with them the advantages of both low temperature synthesis and a reduced reliance on potentially toxic and non-eco-friendly compounds. This can be seen as a boon in the biomaterials industry, where there is a need for highly bespoke, biocompatible, processable polymers with unique biological properties, for the regeneration and replacement of a large number of tissue types, following disease. However, barriers still remain to the mass-production of some of these polymers, necessitating new research. This review attempts a critical analysis of the contemporary literature concerning the use of a number of bacteria-derived polymers in the context of biomedical applications, including the biosynthetic pathways and organisms involved, as well as the challenges surrounding their mass production. This review will also consider the unique properties of these bacteria-derived polymers, contributing to bioactivity, including antibacterial properties, oxygen permittivity, and properties pertaining to cell adhesion, proliferation, and differentiation. Finally, the review will select notable examples in literature to indicate future directions, should the aforementioned barriers be addressed, as well as improvements to current bacterial fermentation methods that could help to address these barriers.
Collapse
Affiliation(s)
| | | | | | - Ipsita Roy
- Department of Materials Science and Engineering, Faculty of Engineering, University of Sheffield, Sheffield S1 3JD, UK; (J.D.H.); (A.P.M.); (S.M.D.S.M.)
| |
Collapse
|
9
|
Lei W, Krolla P, Schwartz T, Levkin PA. Controlling Geometry and Flow Through Bacterial Bridges on Patterned Lubricant-Infused Surfaces (pLIS). SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2004575. [PMID: 33216442 DOI: 10.1002/smll.202004575] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 10/11/2020] [Indexed: 06/11/2023]
Abstract
Spatial control of bacteria and biofilms on surfaces is necessary to understand the biofilm formation and the social interactions between bacterial communities, which could provide useful hints to study the biofilm-involved diseases. Here patterned lubricant-infused surfaces (pLIS) are utilized to fabricate connective structures named "bacterial bridges" between bacterial colonies of Pseudomonas aeruginosa by a simple dewetting method. It is demonstrated that the bacteria attached to hydrophilic areas and bacteria precipitated on lubricant infused borders both contribute to the formation of bacterial bridges. The geometry and distribution of bridges can be controlled using predesigned superhydrophobic-hydrophilic patterns. It is demonstrated that bacterial bridges connecting bacteria colonies act as bio-microfluidic channels and can transport liquids, nutrients, and antibacterial substances between neighboring bacteria clusters. Thus, bacterial bridges can be used to study formation, spreading, and development of bacterial colonies, and communication within and between isolated biofilms.
Collapse
Affiliation(s)
- Wenxi Lei
- Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
| | - Peter Krolla
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
| | - Thomas Schwartz
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
| | - Pavel A Levkin
- Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
- Institute of Organic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, 76131, Germany
| |
Collapse
|
10
|
Physicochemical analysis, proteolysis activity and exopolysaccharides production of herbal yogurt fortified with plant extracts. INTERNATIONAL JOURNAL OF FOOD ENGINEERING 2020. [DOI: 10.1515/ijfe-2020-0020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Yogurt production with starter culture at 41 °C in the presence of plant water extracts (Momordica grosvenori, Psidium guajava, Lycium barbarum or Garcinia mangostana) were studied to examine the effects on acidification, physicochemical properties, microbial growth, proteolytic activity, and exopolysaccharide (EPS) content. All plant-based yogurt reached a pH of 4.5 faster (300–330 min) than plain-yogurt (360 min). All plant water extracts stimulated Lactobacillus spp. (∼7.4 log10 CFU/mL) and Streptococcus thermophilus (8.20–8.50 log10 CFU/mL) growth except for G. mangostana which marginally inhibited Lactobacillus spp. growth (7.21 log10 CFU/mL). M. grosvenori, L. barbarum, and G. mangonstana were significantly affected proteolysis of milk proteins (46.2 ± 0.8, 39.9 ± 0.5, & 35.8 ± 0.1 µg/mL; respectively) compared to plain-yogurt (26.3 ± 0.4 µg/mL). The presence of G. mangostana and L. barbarum resulted in an increase (p < 0.05) of total solids content (∼15.0%) and water holding capacity in yogurt (28.1 ± 1.2 & 26.5 ± 0.3%; respectively; p < 0.05). In addition, M. grosvenori water extract enhanced (p < 0.05) syneresis of yogurt (1.78 ± 0.30%). L. barbarum yogurt showed the highest EPS concentration (220.9 ± 12.4 µg/L) among yogurt samples. In conclusion, the presence of plant water extracts positively altered yogurt fermentation, enhanced proteolysis of milk protein, and induced EPS production.
Collapse
|
11
|
In vitro screening of antimicrobial, antioxidant, cytotoxic activities, and characterization of bioactive substances from freshwater cyanobacteria Oscillatoria sp. SSCM01 and Phormidium sp. SSCM02. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2020.101772] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
12
|
Exploring the Role of Bacterial Extracellular Polymeric Substances for Sustainable Development in Agriculture. Curr Microbiol 2020; 77:3224-3239. [PMID: 32876713 DOI: 10.1007/s00284-020-02169-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 08/18/2020] [Indexed: 01/02/2023]
Abstract
The incessant need to increase crop yields has led to the development of many chemical fertilizers containing NPK (nitrogen-phosphorous-potassium) which can degrade soil health in the long term. In addition, these fertilizers are often leached into nearby water bodies causing algal bloom and eutrophication. Bacterial secondary metabolites exuded into the extracellular space, termed extracellular polymeric substances (EPS) have gained commercial significance because of their biodegradability, non-toxicity, and renewability. In many habitats, bacterial communities faced with adversity will adhere together by production of EPS which also serves to bond them to surfaces. Typically, hygroscopic, EPS retain moisture in desiccating conditions and modulate nutrient exchange. Many plant growth-promoting bacteria (PGPR) combat harsh environmental conditions like salinity, drought, and attack of pathogens by producing EPS. The adhesive nature of EPS promotes soil aggregation and restores moisture thus combating soil erosion and promoting soil fertility. In addition, these molecules play vital roles in maintaining symbiosis and nitrogen fixation thus enhancing sustainability. Thus, along with other commercial applications, EPS show promising avenues for improving agricultural productivity thus helping to address land scarcity as well as minimizing environmental pollution.
Collapse
|
13
|
Montusiewicz A, Szaja A, Musielewicz I, Cydzik-Kwiatkowska A, Lebiocka M. Effect of bioaugmentation on digestate metal concentrations in anaerobic digestion of sewage sludge. PLoS One 2020; 15:e0235508. [PMID: 32614917 PMCID: PMC7332046 DOI: 10.1371/journal.pone.0235508] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 06/16/2020] [Indexed: 11/25/2022] Open
Abstract
This study examined the influence of bioaugmentation on metal concentrations (aluminum, cadmium, chromium, cobalt, copper, iron, lead, manganese, molybdenum, nickel and zinc) in anaerobically digested sewage sludge. To improve the digestion efficiency, bioaugmentation with a mixture of wild-living Archaea and Bacteria (MAB) from Yellowstone National Park, USA, was used. The total concentration of all metals was higher in the digestate than in the feedstock. During anaerobic digestion, the percent increase in the concentration of most of metals was slightly higher in the bioaugmented runs than in the un-augmented runs, but these differences were not statistically significant. However, the percent increase in cadmium and cobalt concentration was significantly higher in the bioaugmented runs than in the un-augmented runs. At MAB doses of 9 and 13% v/v, cadmium concentration in the digestate was 211 and 308% higher than in the feedstock, respectively, and cobalt concentration was 138 and 165%, respectively. Bioaugmentation increased over 4 times the percentage of Pseudomonas sp. in the biomass that are able to efficiently accumulate metals by both extracellular adsorption and intracellular uptake. Biogas production was not affected by the increased metal concentrations. In conclusion, bioaugmentation increased the concentration of metals in dry sludge, which means that it could potentially have negative effects on the environment.
Collapse
Affiliation(s)
| | - Aleksandra Szaja
- Lublin University of Technology, Faculty of Environmental Engineering, Lublin, Poland
| | - Iwona Musielewicz
- Lublin University of Technology, Faculty of Environmental Engineering, Lublin, Poland
| | | | - Magdalena Lebiocka
- Lublin University of Technology, Faculty of Environmental Engineering, Lublin, Poland
| |
Collapse
|
14
|
Ali P, Shah AA, Hasan F, Hertkorn N, Gonsior M, Sajjad W, Chen F. A Glacier Bacterium Produces High Yield of Cryoprotective Exopolysaccharide. Front Microbiol 2020; 10:3096. [PMID: 32117080 PMCID: PMC7026135 DOI: 10.3389/fmicb.2019.03096] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 12/20/2019] [Indexed: 12/21/2022] Open
Abstract
Pseudomonas sp. BGI-2 is a psychrotrophic bacterium isolated from the ice sample collected from Batura glacier, Pakistan. This strain produces highly viscous colonies on agar media supplemented with glucose. In this study, we have optimized growth and production of exopolysaccharide (EPS) by the cold-adapted Pseudomonas sp. BGI-2 using different nutritional and environmental conditions. Pseudomonas sp. BGI-2 is able to grow in a wide range of temperatures (4-35°C), pH (5-11), and salt concentrations (1-5%). Carbon utilization for growth and EPS production was extensively studied and we found that glucose, galactose, mannose, mannitol, and glycerol are the preferable carbon sources. The strain is also able to use sugar waste molasses as a growth substrate, an alternative for the relatively expensive sugars for large scale EPS production. Maximum EPS production was observed at 15°C, pH 6, NaCl (10 g L-1), glucose as carbon source (100 g L-1), yeast extract as nitrogen source (10 g L-1), and glucose/yeast extract ratio (10/1). Under optimized conditions, EPS production was 2.01 g L-1, which is relatively high for a Pseudomonas species compared to previous studies using the same method for quantification. High-performance anion-exchange chromatography with pulsed amperometric detection (HPAEC-PAD) analysis of EPS revealed glucose, galactose, and glucosamine as the main sugar monomers. Membrane protection assay using human RBCs revealed significant reduction in cell lysis (∼50%) in the presence of EPS, suggesting its role in membrane protection. The EPS (5%) also conferred significant cryoprotection for a mesophilic Escherichia coli k12 which was comparable to glycerol (20%). Also, improvement in lipid peroxidation inhibition (in vitro) resulted when lipids from the E. coli was pretreated with EPS. Increased EPS production at low temperatures, freeze thaw tolerance of the EPS producing strain, and increased survivability of E. coli in the presence of EPS as cryoprotective agent supports the hypothesis that EPS production is a strategy for survival in extremely cold environments such as the glacier ice.
Collapse
Affiliation(s)
- Pervaiz Ali
- Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Science, Baltimore, MD, United States
- Applied Environmental and Geomicrobiology Laboratory, Department of Microbiology, Quaid-i-Azam University, Islamabad, Pakistan
| | - Aamer Ali Shah
- Applied Environmental and Geomicrobiology Laboratory, Department of Microbiology, Quaid-i-Azam University, Islamabad, Pakistan
| | - Fariha Hasan
- Applied Environmental and Geomicrobiology Laboratory, Department of Microbiology, Quaid-i-Azam University, Islamabad, Pakistan
| | - Norbert Hertkorn
- Research Unit Analytical Biogeochemistry, Helmholtz Zentrum München, Munich, Germany
| | - Michael Gonsior
- Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Baltimore, MD, United States
| | - Wasim Sajjad
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, Pakistan
| | - Feng Chen
- Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Science, Baltimore, MD, United States
| |
Collapse
|
15
|
Yousef RH, Baothman OAS, Abdulaal WH, Abo-Golayel MK, Darwish AA, Moselhy SS, Ahmed YM, Hakeem KR. Potential antitumor activity of exopolysaccharide produced from date seed powder as a carbon source for Bacillus subtilis. J Microbiol Methods 2020; 170:105853. [PMID: 31978532 DOI: 10.1016/j.mimet.2020.105853] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 01/20/2020] [Accepted: 01/21/2020] [Indexed: 11/30/2022]
Abstract
The major functions of Exopolysaccharide (EPS) include, preventing bacterial cells from desiccating and biofilm production to increase the colonization of bacterial cells. In the current study, a bacterial strain was isolated to produce EPS. Phylogenetic analysis of the isolated strain indicated it was related to Bacillus subtilis. The bacterium showed the ability to produce a new EPS using very cheap date seeds as a carbon source. Different conditions were studied to enhance exopolysaccharide production. Maximum total sugars (exopolysaccharide) were reached to 0.87 mM) at 20 g/lAjwadates seed (ADS). The maximum production was found to be 3.46 mM by addition of peptone as the main source of nitrogen with a concentration of 1.5 g/L. The optimal parameter values were temperature 37 °C, pH 6, incubation time 72 h and inoculum concentration 1 mL. The crude exopolysaccharide was purified by removing the cells, then the protein, then dialysis and finally ethanol precipitation of the exopolysaccharide. This method modification increased exopolysaccharide production to 0.6 g/L. The exopolysaccharide produced showed antitumor activity against Erlich tumor cells. It is promising for application on a large scale for different types of cancer cell lines.
Collapse
Affiliation(s)
- Rakan H Yousef
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Othman A S Baothman
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia; Head of the Central Lab of Microbial Toxicology & Natural Products Center, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Wesam H Abdulaal
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mohamed K Abo-Golayel
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia; Medical Research Centre, Ain Shams University Hospitals, Faculty of Medicine, Ain Shams University, Egypt
| | - Anas A Darwish
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Said S Moselhy
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia; Biochemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Youssri M Ahmed
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia; Head of Production of Bioproducts for Industrial Applications Research Group and Experimental Biochemistry Unit, King Fahd Medical Research Center, King Abdulaziz University, KSA, Saudi Arabia; Microbial Biotechnology Dep., Genetic Engineering and Biotechnology Research Division, National Research Center, Dokki, Cairo, Egypt
| | - Khalid Rehman Hakeem
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University (KAU), PO Box 80203, Jeddah, Saudi Arabia; Princess Dr Najla Bint Saud Al- Saud Center for Excellence Research in Biotechnology, King Abdulaziz University, Jeddah, Saudi Arabia.
| |
Collapse
|
16
|
Song M, Im SJ, Jeong D, Jang A. Reduction of biofouling potential in cartridge filter by using chlorine dioxide for enhancing anti-biofouling of seawater reverse osmosis membrane. ENVIRONMENTAL RESEARCH 2020; 180:108866. [PMID: 31703977 DOI: 10.1016/j.envres.2019.108866] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 10/08/2019] [Accepted: 10/27/2019] [Indexed: 06/10/2023]
Abstract
In general, cartridge filters (CFs) are installed before reverse osmosis systems as a safeguard to minimize fouling of the reverse osmosis membrane in seawater desalination plants. Depending on the retention time of microorganisms and various fouling matter in the storage tank, pipe, and filter housing, serious fouling of the CF may occur, decreasing its lifetime. More importantly, biofouling of CFs in a continuous process can have a significant impact on reverse osmosis membrane fouling. Few studies related to CF fouling and control have been undertaken due to the low cost of CFs. Herein, comparative evaluation of optical density (O.D) for Cl2 and ClO2 was performed to investigate the efficiency of biofouling control and for developing alternative disinfection processes because the chemistry and reactivity of ClO2 differ from those of Cl2. The results showed that the concentrations of Cl2 and ClO2 required to achieve a log reduction value of 2 for the live bacterial cells with 180 min of contact time were 1.5 and 0.6 mg L-1, respectively. Both Cl2 and ClO2 were effective for the control of organic matter and particles. However, the required Cl2 concentration (1.5 mg L-1) was 2.5 times higher than that of ClO2 (0.6 mg L-1). Surface analysis and economic evaluation of the CF showed that ClO2 has higher biofouling control ability than Cl2 and is more economical, at a current cost of $ 23,667 during seawater desalination plant duration.
Collapse
Affiliation(s)
- Minhyung Song
- Graduate School of Water Resources, Sungkyunkwan University (SKKU), 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 440-746, Republic of Korea.
| | - Sung Ju Im
- Graduate School of Water Resources, Sungkyunkwan University (SKKU), 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 440-746, Republic of Korea.
| | - Dawoon Jeong
- Graduate School of Water Resources, Sungkyunkwan University (SKKU), 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 440-746, Republic of Korea.
| | - Am Jang
- Graduate School of Water Resources, Sungkyunkwan University (SKKU), 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 440-746, Republic of Korea.
| |
Collapse
|
17
|
Zhu Y, Yan J, Xia L, Zhang X, Luo L. Mechanisms of Cr(VI) reduction by Bacillus sp. CRB-1, a novel Cr(VI)-reducing bacterium isolated from tannery activated sludge. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 186:109792. [PMID: 31629191 DOI: 10.1016/j.ecoenv.2019.109792] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Revised: 10/07/2019] [Accepted: 10/10/2019] [Indexed: 06/10/2023]
Abstract
Cr(VI) reduction by microorganisms has been extensively reported, however, the mechanism of Cr(VI) reduction varies among different microorganisms. In this study, a Cr(VI)-reducing bacterium identified as Bacillus sp. was isolated from tannery activated sludge, strain CRB-1 was able to completely reduce 50 mg/L of Cr(VI) within 24 h under aerobic conditions and exhibited considerable Cr(VI) removal efficiency in the pH range from 7.0 to 9.0, temperature 24-42 °C. Cr(VI) reduction assays with resting cells, permeabilized cells, and subcellular fractions suggested that Cr(VI) reduction mainly occurred in the cytoplasm. According to qRT-PCR analysis, a chrA gene and a nitR2 gene were up-regulated under Cr(VI) stress. Heterologous expression of the chrA gene and the nitR2 gene indicated that ChrA was associated with Cr(VI) resistance, while NitR2 was responsible for Cr(VI) reduction. Furthermore, soluble end products were detected. On the basis of FTIR, it was speculated that the formation of soluble end products may be due to the complexation of EPS with Cr(III). Consequently, the Cr(VI)-reducing ability of strain CRB-1 and its chromate reductases enables CRB-1 a potential candidate for Cr(VI) bioremediation.
Collapse
Affiliation(s)
- Yunfei Zhu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Junwei Yan
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Li Xia
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Xiang Zhang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Lixin Luo
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China.
| |
Collapse
|
18
|
Blunt W, Gaugler M, Collet C, Sparling R, Gapes DJ, Levin DB, Cicek N. Rheological Behavior of High Cell Density Pseudomonas putida LS46 Cultures during Production of Medium Chain Length Polyhydroxyalkanoate (PHA) Polymers. Bioengineering (Basel) 2019; 6:E93. [PMID: 31600906 PMCID: PMC6956342 DOI: 10.3390/bioengineering6040093] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 10/01/2019] [Accepted: 10/08/2019] [Indexed: 12/20/2022] Open
Abstract
The rheology of high-cell density (HCD) cultures is an important parameter for its impact on mixing and sparging, process scale-up, and downstream unit operations in bioprocess development. In this work, time-dependent rheological properties of HCD Pseudomonas putida LS46 cultures were monitored for microbial polyhydroxyalkanoate (PHA) production. As the cell density of the fed-batch cultivation increased (0 to 25 g·L-1 cell dry mass, CDM), the apparent viscosity increased nearly nine-fold throughout the fed-batch process. The medium behaved as a nearly Newtonian fluid at lower cell densities, and became increasingly shear-thinning as the cell density increased. However, shear-thickening behavior was observed at shearing rates of approximately 75 rad·s-1 or higher, and its onset increased with viscosity of the sample. The supernatant, which contained up to 9 g·L-1 soluble organic material, contributed more to the observed viscosity effect than did the presence of cells. Owing to this behavior, the oxygen transfer performance of the bioreactor, for otherwise constant operating conditions, was reduced by 50% over the cultivation time. This study has shown that the dynamic rheology of HCD cultures is an important engineering parameter that may impact the final outcome in PHA cultivations. Understanding and anticipating this behavior and its biochemical origins could be important for improving overall productivity, yield, process scalability, and the efficacy of downstream processing unit operations.
Collapse
Affiliation(s)
- Warren Blunt
- Department of Biosystems Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada.
| | - Marc Gaugler
- Scion Research, Te Papa Tipu Innovation Park, 49 Sala Street, Private Bag 3020, Rotorua 3046, New Zealand.
| | - Christophe Collet
- Scion Research, Te Papa Tipu Innovation Park, 49 Sala Street, Private Bag 3020, Rotorua 3046, New Zealand.
| | - Richard Sparling
- Department of Microbiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.
| | - Daniel J Gapes
- Scion Research, Te Papa Tipu Innovation Park, 49 Sala Street, Private Bag 3020, Rotorua 3046, New Zealand.
| | - David B Levin
- Department of Biosystems Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada.
| | - Nazim Cicek
- Department of Biosystems Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada.
| |
Collapse
|
19
|
Kutralam-Muniasamy G, Pérez-Guevara F. Comparative genome analysis of completely sequenced Cupriavidus genomes provides insights into the biosynthetic potential and versatile applications of Cupriavidus alkaliphilus ASC-732. Can J Microbiol 2019; 65:575-595. [PMID: 31022352 DOI: 10.1139/cjm-2019-0027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The genome analysis of microorganisms provides valuable information to endorse more extensive research on their potential applications. In this paper, the genome of Cupriavidus alkaliphilus ASC-732, isolated from agave rhizosphere in northeastern Mexico, was analyzed and compared with the genomes of other Cupriavidus species to gain better insight into the parts in the genetic makeup responsible for essential metabolic pathways and others of biotechnological importance. Here, the key genes related to glycolysis, pentose phosphate, and the Entner-Doudoroff and tricarboxylic acid cycle pathways were predicted. Comparative genome analysis revealed that the key genes for hydrogenotrophic growth and carbon fixation pathway, i.e., those coding for hydrogenase and enzymes Calvin-Benson-Bassham cycle, are absent in C. alkaliphilus ASC-732. Furthermore, capabilities for producing polyhydroxyalkanoates and extracellular polysaccharide matrix and degrading xenobiotics were found, and the related pathways are explained. Moreover, biofilm formation and the production of exopolysaccharides and polyhydroxyalkanoates were corroborated with crystal violet staining, calcofluor, and Nile red fluorochromes, confirming the presence of the products of the active genes in these pathways and their related metabolic routes, respectively. Additionally, a large group of genes essential for the resistance and detoxification of several heavy metals were also found. Thus, the present study demonstrates that this strain can respond to various environmental signals, such as energy source, nutrient limitations, virulence, and extreme metals concentration, indicating the possibility to foster C. alkaliphilus ASC-732 in diverse biotechnological applications.
Collapse
Affiliation(s)
- Gurusamy Kutralam-Muniasamy
- a Department of Biotechnology and Bioengineering, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de Mexico, Mexico
| | - Fermín Pérez-Guevara
- a Department of Biotechnology and Bioengineering, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de Mexico, Mexico.,b Nanoscience and Nanotechnology Program, Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de Mexico, Mexico
| |
Collapse
|
20
|
Nagaraj V, Skillman L, Li D, Ho G. Review - Bacteria and their extracellular polymeric substances causing biofouling on seawater reverse osmosis desalination membranes. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 223:586-599. [PMID: 29975885 DOI: 10.1016/j.jenvman.2018.05.088] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 05/25/2018] [Accepted: 05/26/2018] [Indexed: 05/26/2023]
Abstract
Biofouling in seawater reverse osmosis (SWRO) membranes is a critical issue faced by the desalination industry worldwide. The major cause of biofouling is the irreversible attachment of recalcitrant biofilms formed by bacteria and their extracellular polymeric substances (EPS) on membrane surfaces. Transparent exopolymer particles (TEP) and protobiofilms are recently identified as important precursors of membrane fouling. Despite considerable amount of research on SWRO biofouling, the control of biofouling still remains a challenge. While adoption of better pretreatment methods may help in preventing membrane biofouling in new desalination setups, it is also crucial to effectively disperse old, recalcitrant biofilms and prolong membrane life in operational plants. Most current practices employ the use of broad spectrum biocides and chemicals that target bacterial cells to disperse mature biofilms, which are evidently inefficient. EPS, being known as the strongest structural framework of biofilms, it is essential to breakdown and disintegrate the EPS components for effective biofilm removal. To achieve this, it is necessary to understand the chemical composition and key elements that constitute the EPS of major biofouling bacterial groups in multi-species, mature biofilms. However, significant gaps in understanding the complexity of EPS are evident by the failure to achieve effective prevention and mitigation of fouling in most cases. Some of the reasons may be difficulty in sampling membranes from fully operational full-scale plants, poor understanding of microbial communities and their ecological shifts under dynamic operational conditions within the desalination process, selection of inappropriate model species for laboratory-scale biofouling studies, and the laborious process of extraction and purification of EPS. This article reviews the novel findings on key aspects of SWRO membrane fouling and control measures with particular emphasis on the key sugars in EPS. As a novel strategy to alleviate biofouling, future control methods may be aimed towards specifically disintegrating and breaking down these key sugars rather than using broad spectrum chemicals such as biocides that are currently used in the industry.
Collapse
Affiliation(s)
- Veena Nagaraj
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, Western Australia 6150, Australia.
| | - Lucy Skillman
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, Western Australia 6150, Australia.
| | - Dan Li
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, Western Australia 6150, Australia.
| | - Goen Ho
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, Western Australia 6150, Australia.
| |
Collapse
|
21
|
Adebayo-Tayo B, Ishola R, Oyewunmi T. Characterization, antioxidant and immunomodulatory potential on exopolysaccharide produced by wild type and mutant Weissella confusa strains. BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2018; 19:e00271. [PMID: 29992104 PMCID: PMC6036864 DOI: 10.1016/j.btre.2018.e00271] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Revised: 06/29/2018] [Accepted: 06/30/2018] [Indexed: 01/17/2023]
Abstract
Characterization, antioxidant and immunomodulatory potential of exopolysaccharide (EPS) produced by wild type and mutant Weissella confusa was investigated. The EPS production ranged from 5490.2 to 5580.7 mg/L. Wild type Weissella confusa (WWCEPS) had the highest EPS production. Eight (8) sugar moieties were present in the EPS. Galactose had the highest EPS composition (34.6 mg/100 g and 33.5 mg/100 g EPS) in Wild type Weissella confusa EPS (WWCEPS) and mutant Weissella confusa EPS (MWCEPS). Wild type Weissella confusa and mutant Weissella confusa EPS had antioxidant capacity. The scavenging assay for the antioxidant increased in a dose dependent (0.5-10 mg/mL) manner. Wild type Weissella confusa EPS had the highest 1,1-Diphemy 1-2-picryl-hydrazyl (DPPH) capacity, total antioxidant activity, hydrogen peroxide and reducing power activity (71%, 1.9%, 86.7% and 1.9%). The mice injected peritorially with mutant Weissella confusa EPS had the highest IgG and IgM (68-87 mg/dL and 64-70 mg/dL). IgA of the mice treated with Wild type Weissella confusa EPS increased from 67 to 73 mg/dL. Wild type and mutant Weissella confusa EPS had immunomodulatory activity on the treated mice.
Collapse
Affiliation(s)
- Bukola Adebayo-Tayo
- Department of Microbiology, University of Ibadan, Ibadan, Oyo State, Nigeria
| | - Racheal Ishola
- Department of Microbiology, University of Ibadan, Ibadan, Oyo State, Nigeria
| | - Titiloye Oyewunmi
- Immunology Unit, Department of Chemical Pathology, College of Medicine, University of Ibadan, Nigeria
| |
Collapse
|
22
|
Characterization and Production of Extracellular Polysaccharides (EPS) by Bacillus Pseudomycoides U10. ENVIRONMENTS 2018. [DOI: 10.3390/environments5060063] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
23
|
Sengupta D, Datta S, Biswas D. Towards a better production of bacterial exopolysaccharides by controlling genetic as well as physico-chemical parameters. Appl Microbiol Biotechnol 2018; 102:1587-1598. [DOI: 10.1007/s00253-018-8745-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Revised: 12/22/2017] [Accepted: 12/27/2017] [Indexed: 11/28/2022]
|
24
|
Yu Q, Fein JB. Controls on Bacterial Cell Envelope Sulfhydryl Site Concentrations: The Effect of Glucose Concentration During Growth. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:7395-7402. [PMID: 28603975 DOI: 10.1021/acs.est.7b01047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Bacterial sulfhydryl sites can form strong complexes with chalcophilic metals such as Hg and Cd, thereby affecting the fate, transport, and bioavailability of these metals in both natural and engineered systems. In this study, five bacterial species were cultured in M9 minimal media containing a range of glucose concentrations as carbon source and in a high-nutrient TSB medium enriched with 50 g/L of glucose, and the sulfhydryl site concentrations of the obtained biomass samples were determined through selective sulfhydryl site-blocking, potentiometric titrations, and surface complexation modeling. The experimental results show that the glucose concentration in the M9 minimal media strongly affects the concentration of sulfhydryl sites that are present on the bacteria, with higher glucose concentrations yielding higher bacterial sulfhydryl site concentrations for each species studied. In contrast, although adding 50 g/L of glucose to the TSB medium significantly increases the sulfhydryl site concentrations for the three Bacillus species studied, the elevated glucose concentration does not significantly affect sulfhydryl site concentrations for S. oneidensis and P. putida samples when grown in the TSB medium. Our results suggest that bacterial sulfhydryl site concentrations in natural systems are likely affected by the composition of the bacterial community and by the available nutrients, and that these factors must be considered in order to determine and model the effects of bacterial cells on metal cycling and metal bioavailability in the environment.
Collapse
Affiliation(s)
- Qiang Yu
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - Jeremy B Fein
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame , Notre Dame, Indiana 46556, United States
| |
Collapse
|
25
|
Bhatia RK, Bhatia SK, Mehta PK, Bhalla TC. Bio-statistical enhancement of acyl transfer activity of amidase for biotransformation of N-substituted aromatic amides. J GEN APPL MICROBIOL 2017; 62:90-7. [PMID: 27118077 DOI: 10.2323/jgam.62.90] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2022]
Abstract
Acyl transfer activity (ATA) of amidase transfers an acyl group of different amides to hydroxylamine to form the corresponding hydroxamic acid. Bacterial isolate BR-1 was isolated from cyanogenic plant Cirsium vulgare rhizosphere and identified as Pseudomonas putida BR-1 by 16S rDNA sequencing. This organism exhibited high ATA for the biotransformation of N-substituted aromatic amide to the corresponding hydroxamic acid. Optimization of media, tryptone (0.6%), inducer, pH 8.5, and a growth temperature 25°C for 56 h, resulted in a 7-fold increase in ATA. Further, Response Surface Methodology (RSM) and multiple feeding approach (20 mM after 14 h) of inducer led to a 29% enhancement of ATA from this organism. The half life (t1/2) of this enzyme at 50°C and 60°C was 3 h and 1 h, respectively. The ATA of amidase of Pseudomonas putida BR-1 makes it a potential candidate for the production of a variety of N-substituted aromatic hydroxamic acid.
Collapse
|
26
|
Sathiyanarayanan G, Bhatia SK, Kim HJ, Kim JH, Jeon JM, Kim YG, Park SH, Lee SH, Lee YK, Yang YH. Metal removal and reduction potential of an exopolysaccharide produced by Arctic psychrotrophic bacterium Pseudomonas sp. PAMC 28620. RSC Adv 2016. [DOI: 10.1039/c6ra17450g] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Metal reducing potential of an exopolysaccharide (EPS) produced by Arctic glacier soil bacteriumPseudomonassp. PAMC 28620.
Collapse
|
27
|
Isolation of an exopolysaccharide-producing heavy metal-resistant Halomonas sp. MG. Arch Microbiol 2015; 198:205-9. [DOI: 10.1007/s00203-015-1173-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 11/07/2015] [Accepted: 11/11/2015] [Indexed: 11/25/2022]
|
28
|
Feng J, Gu Y, Quan Y, Cao M, Gao W, Zhang W, Wang S, Yang C, Song C. Improved poly-γ-glutamic acid production in Bacillus amyloliquefaciens by modular pathway engineering. Metab Eng 2015; 32:106-115. [DOI: 10.1016/j.ymben.2015.09.011] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 09/10/2015] [Accepted: 09/11/2015] [Indexed: 12/13/2022]
|
29
|
Peng L, Qiao S, Xu Z, Guan F, Ding Z, Gu Z, Zhang L, Shi G. Effects of culture conditions on monosaccharide composition of Ganoderma lucidum exopolysaccharide and on activities of related enzymes. Carbohydr Polym 2015; 133:104-9. [PMID: 26344261 DOI: 10.1016/j.carbpol.2015.07.014] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 07/06/2015] [Accepted: 07/07/2015] [Indexed: 11/29/2022]
Abstract
We investigated the relationship between monosaccharide composition of Ganoderma lucidum exopolysaccharide (EPS) and activities of EPS synthesis enzymes under various culture temperatures and initial pH values. The mole percentages of three major EPS monosaccharides, glucose, galactose and mannose, varied depending on culture conditions and the resulting EPS displayed differing anti-tumor activities. In nine tested enzymes, higher enzyme activities were correlated with higher temperature and lower initial pH. Altered mole percentages of galactose and mannose under various culture conditions were associated with activities of α-phosphoglucomutase (PGM) and phosphoglucose isomerase (PGI), respectively, and that of mannose was also associated with phosphomannose isomerase (PMI) activity only under various pH. Our findings suggest that mole percentages of G. lucidum EPS monosaccharides can be manipulated by changes of culture conditions that affect enzyme activities, and that novel fermentation strategies based on this approach may enhance production and biological activity of EPS.
Collapse
Affiliation(s)
- Lin Peng
- Key Laboratory of Carbohydrate Chemistry & Biotechnology Ministry of Education, & School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Shuangkui Qiao
- Key Laboratory of Carbohydrate Chemistry & Biotechnology Ministry of Education, & School of Biotechnology, Jiangnan University, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, China
| | - Zhenghong Xu
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Feng Guan
- Key Laboratory of Carbohydrate Chemistry & Biotechnology Ministry of Education, & School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Zhongyang Ding
- Key Laboratory of Carbohydrate Chemistry & Biotechnology Ministry of Education, & School of Biotechnology, Jiangnan University, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China.
| | - Zhenghua Gu
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, China
| | - Liang Zhang
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, China
| | - Guiyang Shi
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, China
| |
Collapse
|
30
|
Mageswari A, Subramanian P, Ravindran V, Yesodharan S, Bagavan A, Rahuman AA, Karthikeyan S, Gothandam KM. Synthesis and larvicidal activity of low-temperature stable silver nanoparticles from psychrotolerant Pseudomonas mandelii. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:5383-5394. [PMID: 25342455 DOI: 10.1007/s11356-014-3735-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2014] [Accepted: 10/15/2014] [Indexed: 06/04/2023]
Abstract
Applications based on silver nanoparticles (AgNPs) are limited by low temperatures, which cause aggregation of the nanoparticle fraction, leading to reduced efficacy of their products. We aimed at studying AgNP synthesis by psychrotolerant bacteria, its stability under long-term storage, and larvicidal activity under low-temperature conditions. Electron and atomic force microscopy studies revealed that 6 among 22 psychrotolerant isolates synthesized AgNPs with an average diameter of 1.9-14.1 nm. Pseudomonas mandelii SR1 synthesized the least-sized AgNPs with an average diameter of 1.9-10 nm, at temperatures as low as 12 °C without aggregate formation, and the synthesized nanoparticles were stable for up to 19 months of storage period. On studying their larvicidal activity, LC90 (lethal concentration) values against Anopheles subpictus and Culex tritaeniorhynchus larvae were at 31.7 and 35.6 mg/L, respectively. Stable non-aggregate AgNPs at low-temperature conditions from P. mandelii SR1, coupled with their larvicidal property, can be applied to control larval populations in water bodies located in seasonal or permanently cold environments.
Collapse
Affiliation(s)
- Anbazhagan Mageswari
- School of Bio Sciences and Technology, VIT University, Vellore, Tamil Nadu, 632014, India
| | | | | | | | | | | | | | | |
Collapse
|
31
|
New emulsifying and cryoprotective exopolysaccharide from Antarctic Pseudomonas sp. ID1. Carbohydr Polym 2015; 117:1028-1034. [DOI: 10.1016/j.carbpol.2014.08.060] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 08/12/2014] [Accepted: 08/13/2014] [Indexed: 11/23/2022]
|
32
|
Ahmad NH, Mustafa S, Che Man YB. Microbial Polysaccharides and Their Modification Approaches: A Review. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2014. [DOI: 10.1080/10942912.2012.693561] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
33
|
Feng J, Gu Y, Sun Y, Han L, Yang C, Zhang W, Cao M, Song C, Gao W, Wang S. Metabolic engineering of Bacillus amyloliquefaciens for poly-gamma-glutamic acid (γ-PGA) overproduction. Microb Biotechnol 2014; 7:446-55. [PMID: 24986065 PMCID: PMC4229325 DOI: 10.1111/1751-7915.12136] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2014] [Revised: 04/29/2014] [Accepted: 05/08/2014] [Indexed: 01/16/2023] Open
Abstract
We constructed a metabolically engineered glutamate-independent Bacillus amyloliquefaciens strain with considerable γ-PGA production. It was carried out by double-deletion of the cwlO gene and epsA-O cluster, as well as insertion of the vgb gene in the bacteria chromosome. The final generated strain NK-PV elicited the highest production of γ-PGA (5.12 g l(-1)), which was 63.2% higher than that of the wild-type NK-1 strain (3.14 g l(-1)). The γ-PGA purity also improved in the NK-PV strain of 80.4% compared with 76.8% for the control. Experiments on bacterial biofilm formation experiment showed that NK-1 and NK-c (ΔcwlO) strains can form biofilm; the epsA-O deletion NK-7 and NK-PV strains could only form an incomplete biofilm.
Collapse
Affiliation(s)
- Jun Feng
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education, Nankai UniversityTianjin, China
- State Key Laboratory of Medicinal Chemical Biology, Nankai UniversityTianjin, China
| | - Yanyan Gu
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education, Nankai UniversityTianjin, China
| | - Yang Sun
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education, Nankai UniversityTianjin, China
| | - Lifang Han
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education, Nankai UniversityTianjin, China
| | - Chao Yang
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education, Nankai UniversityTianjin, China
| | - Wei Zhang
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education, Nankai UniversityTianjin, China
| | - Mingfeng Cao
- Department of Chemical and Biological Engineering, Iowa State UniversityAmes, IA, USA
| | - Cunjiang Song
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education, Nankai UniversityTianjin, China
| | - Weixia Gao
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education, Nankai UniversityTianjin, China
| | - Shufang Wang
- State Key Laboratory of Medicinal Chemical Biology, Nankai UniversityTianjin, China
| |
Collapse
|
34
|
Lai YJ, Tsai SH, Lee MY. Isolation of exopolysaccharide producing Lactobacillus strains from sorghum distillery residues pickled cabbage and their antioxidant properties. Food Sci Biotechnol 2014. [DOI: 10.1007/s10068-014-0168-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
35
|
Paniagua-Michel JDJ, Olmos-Soto J, Morales-Guerrero ER. Algal and microbial exopolysaccharides: new insights as biosurfactants and bioemulsifiers. ADVANCES IN FOOD AND NUTRITION RESEARCH 2014; 73:221-257. [PMID: 25300549 DOI: 10.1016/b978-0-12-800268-1.00011-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Currently, efforts are being made to utilize more natural biological systems as alternatives as a way to replace fossil forms of carbon. There is a growing concern at global level to have nontoxic, nonhazardous surface-active agents; contrary to synthetic surfactants, their biological counterparts or biosurfactants play a primary function, facilitating microbial presence in environments dominated by hydrophilic-hydrophobic interfaces. Algal and microbial biosurfactants/bioemulsifiers from marine and deep-sea environments are attracting major interest due to their structural and functional diversity as molecules actives of surface and an alternative biomass to replace fossil forms of carbon. Algal and microbial surfactants are lipid in nature and classified as glycolipids, phospholipids, lipopeptides, natural lipids, fatty acids, and lipopolysaccharides. These metabolic bioactive products are applicable in a number of industries and processes, viz., food processing, pharmacology, and bioremediation of oil-polluted environments. This chapter presents an update of the progress and potentialities of the principal producers of exopolysaccharide (EPS)-type biosurfactants and bioemulsifiers, viz., macro- and microalgae (cyanobacteria and diatoms) and bacteria from marine and extreme environments. Particular interest is centered into new sources and applications, viz., marine and deep-sea environments and promissory uses of these EPSs as biosurfactants/emulsifiers and other polymeric roles. The enormous benefits of these molecules encourage their discovery, exploitation, and development of new microbial EPSs that could possess novel industrial importance and corresponding innovations.
Collapse
Affiliation(s)
- José de Jesús Paniagua-Michel
- Laboratory for Bioactive Compounds and Bioremediation, Department of Marine Biotechnology, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, Mexico.
| | - Jorge Olmos-Soto
- Laboratory for Molecular Microbiology, Department of Marine Biotechnology, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, Mexico
| | - Eduardo Roberto Morales-Guerrero
- Laboratory for Bioactive Compounds and Bioremediation, Department of Marine Biotechnology, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, Mexico
| |
Collapse
|
36
|
Controlled Production of Exopolysaccharides from Enterobacter A47 as a Function of Carbon Source with Demonstration of Their Film and Emulsifying Abilities. Appl Biochem Biotechnol 2013; 172:641-57. [DOI: 10.1007/s12010-013-0560-0] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Accepted: 09/27/2013] [Indexed: 11/26/2022]
|
37
|
Wang Z, Choi O, Seo Y. Relative contribution of biomolecules in bacterial extracellular polymeric substances to disinfection byproduct formation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:9764-9773. [PMID: 23866010 DOI: 10.1021/es402067g] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this study, detailed chemical compositions of the biomolecules in extracellular polymeric substances (EPS) from both pure cultures of bacteria and mixed species biofilm isolated from a water utility were analyzed. Then, based on detailed EPS analysis results, the DBP yield experiments were conducted with both extracted EPS and surrogate chemicals to indirectly identify the influence of biomolecules and their structures on DBP formation and speciation. DBP yield results of both extracted EPS and EPS surrogates indicated that proteins in EPS have a greater influence on DBP formation, especially on the formation of nitrogenous DBPs (N-DBPs), where amino acids containing unsaturated organic carbon or conjugated bonds in R-group produced higher amount of DBPs. For regulated DBPs, HAA yields were higher than THM yields, while haloacetonitriles were the dominant DBP species formed among unregulated DBPs. However, DBP yields of polysaccharide monomers were lower than those of tested amino acids groups and the DBP yields of polysaccharide monomers were not significantly influenced by their structures. Considering the results obtained in this study, biofilm needs to be considered an important precursor to DBP formation and biofilm eradication methods for water distribution systems need to be carefully selected to minimize subsequent DBP formation.
Collapse
Affiliation(s)
- Zhikang Wang
- Department of Chemical and Environmental Engineering, University of Toledo , Mail Stop 307, 3048 Nitschke Hall, Toledo, Ohio 43606, United States
| | | | | |
Collapse
|
38
|
Zajšek K, Goršek A, Kolar M. Cultivating conditions effects on kefiran production by the mixed culture of lactic acid bacteria imbedded within kefir grains. Food Chem 2013; 139:970-7. [DOI: 10.1016/j.foodchem.2012.11.142] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Revised: 07/17/2012] [Accepted: 11/19/2012] [Indexed: 10/27/2022]
|
39
|
Stewart TJ, Traber J, Kroll A, Behra R, Sigg L. Characterization of extracellular polymeric substances (EPS) from periphyton using liquid chromatography-organic carbon detection-organic nitrogen detection (LC-OCD-OND). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:3214-23. [PMID: 23065603 PMCID: PMC3633784 DOI: 10.1007/s11356-012-1228-y] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 09/24/2012] [Indexed: 05/22/2023]
Abstract
A protocol was developed to extract, fractionate, and quantitatively analyze periphyton extracellular polymeric substances (EPS), which obtains both information on the molecular weight (M r) distribution and protein and polysaccharide content. The EPS were extracted from freshwater periphyton between July and December 2011. Organic carbon (OC) compounds from different EPS extracts were analyzed using liquid chromatography-organic carbon detection-organic nitrogen detection (LC-OCD-OND), and total protein and polysaccharide content were quantified. Four distinct OC fractions, on the basis of M r, were identified in all extracts, corresponding to high M r biopolymers (≥80-4 kDa), degradation products of humic substances (M r not available), low M r acids (10-0.7 kDa), and small amphiphilic/neutral compounds (3-0.5 kDa). Low C/N ratios (4.3 ± 0.8) were calculated for the biopolymer fractions, which represented 16-38 % of the measured dissolved organic carbon (DOC), indicating a significant presence of high M r proteins in the EPS. Protein and polysaccharide represented the two major components of EPS and, when combined, accounted for the measured DOC in extracts. Differences in specific OC fractions of EPS extracts over the course of the study could be quantified using this method. This study suggests that LC-OCD-OND is a new valuable tool in EPS characterization of periphyton.
Collapse
Affiliation(s)
- Theodora J. Stewart
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
- ETH, Institute of Biogeochemistry and Pollutant Dynamics IBP, 8092 Zurich, Switzerland
| | - Jacqueline Traber
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
| | - Alexandra Kroll
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
| | - Renata Behra
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
| | - Laura Sigg
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
- ETH, Institute of Biogeochemistry and Pollutant Dynamics IBP, 8092 Zurich, Switzerland
| |
Collapse
|
40
|
Janaki V, Vijayaraghavan K, Ramasamy AK, Lee KJ, Oh BT, Kamala-Kannan S. Competitive adsorption of Reactive Orange 16 and Reactive Brilliant Blue R on polyaniline/bacterial extracellular polysaccharides composite--a novel eco-friendly polymer. JOURNAL OF HAZARDOUS MATERIALS 2012; 241-242:110-117. [PMID: 23036702 DOI: 10.1016/j.jhazmat.2012.09.019] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Revised: 09/10/2012] [Accepted: 09/11/2012] [Indexed: 06/01/2023]
Abstract
The performance of polyaniline/extracellular polymeric substances (Pn/EPS) composite as an adsorbent to remove the anionic reactive dyes, Reactive Brilliant Blue R (RBBR) and Reactive Orange 16 (RO), was investigated in single and binary systems. The pH(pzc) of Pn/EPS composite was calculated as 3.7 through potentiometric mass titration method. Electrostatic interaction between the dye anion and the nitrogen present in the polymer was identified as a major mechanism in adsorption process. Single component isotherms followed the Langmuir model with the maximum adsorption capacity of 0.5775 mmol g(-1) for RBBR and 0.4748 mmol g(-1) for RO. In binary system, both the reactive dye anions compete with each other and resulted in lower uptake. Binary adsorption data were interpreted well by the Sheindorf-Rehbun-Sheintuch equation as compared to extended Langmuir model with constant interaction factor. Kinetic analysis of single solute followed pseudo-first order model. Thermodynamic studies computed that RBBR and RO adsorption was endothermic, spontaneous, and feasible process.
Collapse
Affiliation(s)
- V Janaki
- Department of Chemistry, Periyar University, Salem 636011, Tamil Nadu, India
| | | | | | | | | | | |
Collapse
|
41
|
Janaki V, Oh BT, Vijayaraghavan K, Kim JW, Kim SA, Ramasamy A, Kamala-Kannan S. Application of bacterial extracellular polysaccharides/polyaniline composite for the treatment of Remazol effluent. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2012.01.045] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
42
|
|
43
|
Pramanik A, Sundararaman M, Das S, Ghosh U, Mukherjee J. ISOLATION AND CHARACTERIZATION OF CYANOBACTERIA POSSESSING ANTIMICROBIAL ACTIVITY FROM THE SUNDARBANS, THE WORLD'S LARGEST TIDAL MANGROVE FOREST(1). JOURNAL OF PHYCOLOGY 2011; 47:731-743. [PMID: 27020009 DOI: 10.1111/j.1529-8817.2011.01017.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Eight obligately halophilic, euryhaline cyanobacteria from intertidal soil were isolated in artificial seawater nutrients III (ASN-III) medium. Antimicrobial activity, 16S rRNA gene sequences, phenotypic characters as well as growth and antibiosis in response to variable salinity, temperature, phosphate concentration, and pH were studied. Minimum inhibitory concentrations (MIC) of the extracts against Staphylococcus aureus, Escherichia coli, Bacillus subtilis, Pseudomonas aeruginosa, and multiple drug-resistant clinical isolates ranged between 0.25 and 0.5 mg · mL(-1) . Cytotoxicity tests showed 73%-84% human colon adenocarcinoma (HT-29/C1) cell survival at MIC values, indicating that the extracts were nontoxic. Morphologically, six cyanobacteria were assigned to the Lyngbya-Phormidium-Plectonema (LPP) group B, and one each was assigned to Oscillatoria and Synechocystis genera. Glycerol, mannitol, and starch supported better photoheterotrophic growth than simpler mono- and disaccharides. No heterocyst formation was observed when grown under nitrogen-starved conditions. All isolates survived 7‰ salinity, grew at minimum 32‰ salinity, and showed sustained growth throughout 32‰-82‰ salinity but matured poorly in freshwater medium supplemented with 30.0 g · L(-1) NaCl. Antimicrobial production occurred only at 32‰ salinity. While four of the eight isolates demonstrated sustained growth at 37°C, maximum antimicrobial activity was obtained at 25°C. All strains showed maximum growth and antimicrobial elaboration at 0.04 g · L(-1) phosphate. All isolates thrived at pH 9.5; six grew at pH 4.5, though antimicrobial production occurred only at pH 7.5. Molecular phylogenetic analysis based on 16S rRNA gene sequences of the filamentous isolates validated the previous taxonomic affiliations established on morphological characteristics. This is the first study of antimicrobial-producing halophilic cyanobacteria from the mangroves.
Collapse
Affiliation(s)
- Arnab Pramanik
- School of Environmental Studies, Jadavpur University, Kolkata 700032, IndiaNational Facility for Marine Cyanobacteria, Bharathidasan University, Tiruchirappalli 620024, IndiaPeerless Hospital and B.K. Roy Research Centre, Kolkata 700094, IndiaDepartment of Food Technology and Biochemical Engineering, Jadavpur University, Kolkata 700032, IndiaSchool of Environmental Studies, Jadavpur University, Kolkata 700032, India
| | - Muthuraman Sundararaman
- School of Environmental Studies, Jadavpur University, Kolkata 700032, IndiaNational Facility for Marine Cyanobacteria, Bharathidasan University, Tiruchirappalli 620024, IndiaPeerless Hospital and B.K. Roy Research Centre, Kolkata 700094, IndiaDepartment of Food Technology and Biochemical Engineering, Jadavpur University, Kolkata 700032, IndiaSchool of Environmental Studies, Jadavpur University, Kolkata 700032, India
| | - Satadal Das
- School of Environmental Studies, Jadavpur University, Kolkata 700032, IndiaNational Facility for Marine Cyanobacteria, Bharathidasan University, Tiruchirappalli 620024, IndiaPeerless Hospital and B.K. Roy Research Centre, Kolkata 700094, IndiaDepartment of Food Technology and Biochemical Engineering, Jadavpur University, Kolkata 700032, IndiaSchool of Environmental Studies, Jadavpur University, Kolkata 700032, India
| | - Uma Ghosh
- School of Environmental Studies, Jadavpur University, Kolkata 700032, IndiaNational Facility for Marine Cyanobacteria, Bharathidasan University, Tiruchirappalli 620024, IndiaPeerless Hospital and B.K. Roy Research Centre, Kolkata 700094, IndiaDepartment of Food Technology and Biochemical Engineering, Jadavpur University, Kolkata 700032, IndiaSchool of Environmental Studies, Jadavpur University, Kolkata 700032, India
| | - Joydeep Mukherjee
- School of Environmental Studies, Jadavpur University, Kolkata 700032, IndiaNational Facility for Marine Cyanobacteria, Bharathidasan University, Tiruchirappalli 620024, IndiaPeerless Hospital and B.K. Roy Research Centre, Kolkata 700094, IndiaDepartment of Food Technology and Biochemical Engineering, Jadavpur University, Kolkata 700032, IndiaSchool of Environmental Studies, Jadavpur University, Kolkata 700032, India
| |
Collapse
|
44
|
ZAJŠEK KATJA, KOLAR MITJA, GORŠEK ANDREJA. Characterisation of the exopolysaccharide kefiran produced by lactic acid bacteria entrapped within natural kefir grains. INT J DAIRY TECHNOL 2011. [DOI: 10.1111/j.1471-0307.2011.00704.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
45
|
Myszka K, Czaczyk K. Characterization of Adhesive Exopolysaccharide (EPS) Produced by Pseudomonas aeruginosa Under Starvation Conditions. Curr Microbiol 2009; 58:541-6. [DOI: 10.1007/s00284-009-9365-3] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2008] [Revised: 11/04/2008] [Accepted: 01/07/2009] [Indexed: 11/30/2022]
|