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Oda S, Tanikawa A. A new plate-hanging method for biofilm quantification and its application to evaluate the role of surface hydrophobicity. J Microbiol Methods 2022; 203:106608. [PMID: 36343771 DOI: 10.1016/j.mimet.2022.106608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/02/2022] [Accepted: 11/02/2022] [Indexed: 11/06/2022]
Abstract
A novel procedure for the quantitative analysis of biofilm formation by bacteria and yeasts, the Plate-hanging method, was developed. In this system, various polymer disks were hung from the lid of a 6-well plate, immersed in a cell suspension, and moderately shaken (70 rpm). In order to verify the validity of the procedure, the effects of the solid surface hydrophobicity of the test disks and the cell surface hydrophobicities of microorganisms on biofilm formation were investigated. Biofilm formation of bacteria and yeasts on the solid surface strongly depended on hydrophobic interactions between the solid surface and the cell surface. A positive correlation between the hydrophobic properties of substratum and cell surfaces was observed. On the other hand, hydrophilic yeasts preferentially adsorbed onto relatively hydrophilic surfaces. Moreover, the plate-hanging method coupled with the periodic exchange of the liquid medium enabled the quantification of long-term biofilm growth.
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Affiliation(s)
- Shinobu Oda
- Genome Biotechnology Laboratory, Kanazawa Institute of Technology, 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan; Research Laboratory for Integrated Technological Systems, Kanazawa Institute of Technology, 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan.
| | - Ayami Tanikawa
- Genome Biotechnology Laboratory, Kanazawa Institute of Technology, 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan
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2
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Wang D, Li W, Zhang X, Liang S, Lin Y. Green Process: Improved Semi-Continuous Fermentation of Pichia pastoris Based on the Principle of Vitality Cell Separation. Front Bioeng Biotechnol 2021; 9:777774. [PMID: 34917600 PMCID: PMC8669635 DOI: 10.3389/fbioe.2021.777774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 10/28/2021] [Indexed: 11/13/2022] Open
Abstract
The large-scale fermentation of Pichia pastoris for recombinant protein production would be time consuming and produce a large amount of waste yeast. Here we introduce a novel semi-continuous fermentation process for P. pastoris GS115 that can separate vitality cells from broth and recycle the cells to produce high-secretory recombinant pectate lyase. It is based on differences in cell sedimentation coefficients with the formation of salt bridges between metal ions and various cell states. Compared to batch-fed cultivation and general semi-continuous culture, the novel process has significant advantages, such as consuming fewer resources, taking less time, and producing less waste yeast. Sedimentation with the addition of Fe3+ metal ions consumed 14.8 ± 0.0% glycerol, 97.8 ± 1.3% methanol, 55.0 ± 0.9 inorganic salts, 81.5 ± 0.0% time cost, and 77.0 ± 0.1% waste yeast versus batch-fed cultivation to produce an equal amount of protein; in addition, the cost of solid-liquid separation was lower for cells in the collected fermentation broth. The process is economically and environmentally efficient for producing recombinant proteins.
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Affiliation(s)
- Denggang Wang
- South China University of Technology, Guangzhou, China
| | - Wenjie Li
- South China University of Technology, Guangzhou, China
| | - Xinying Zhang
- South China University of Technology, Guangzhou, China
| | - Shuli Liang
- South China University of Technology, Guangzhou, China
| | - Ying Lin
- South China University of Technology, Guangzhou, China
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Andreu C, Gómez-Peinado J, Winandy L, Fischer R, Del Olmo ML. Surface display of HFBI and DewA hydrophobins on Saccharomyces cerevisiae modifies tolerance to several adverse conditions and biocatalytic performance. Appl Microbiol Biotechnol 2021; 105:1505-1518. [PMID: 33484321 DOI: 10.1007/s00253-021-11090-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 12/14/2020] [Accepted: 01/03/2021] [Indexed: 02/06/2023]
Abstract
Hydrophobins are relatively small proteins produced naturally by filamentous fungi with interesting biotechnological and biomedical applications given their self-assembly capacity, efficient adherence to natural and artificial surfaces, and to introduce modifications on the hydrophobicity/hydrophilicity of surfaces. In this work we demonstrate the efficient expression on the S. cerevisiae cell surface of class II HFBI of Trichoderma reesei and class I DewA of Aspergillus nidulans, a hydrophobin not previously exposed, using the Yeast Surface Display a-agglutinin (Aga1-Aga2) system. We show that the resulting modifications affect surface properties, and also yeast cells' resistance to several adverse conditions. The fact that viability of the engineered strains increases under heat and osmotic stress is particularly interesting. Besides, improved biocatalytic activity toward the reduction of ketone 1-phenoxypropan-2-one takes place in the reactions carried out at both 30 °C and 40 °C, within a concentration range between 0.65 and 2.5 mg/mL. These results suggest interesting potential applications for hydrophobin-exposing yeasts. KEY POINTS : • Class I hydrophobin DewA can be efficiently exposed on S. cerevisiae cell surfaces. • Yeast exposure of HFBI and DewA increases osmotic and heat resistance. • Engineered strains show modified biocatalytic behavior.
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Affiliation(s)
- Cecilia Andreu
- Departament de Química Orgànica, Facultat de Farmàcia, Universitat de València, Burjassot, València, Spain
| | - Javier Gómez-Peinado
- Departament de Bioquímica i Biologia Molecular, Facultat de Ciències Biològiques, Universitat de València, Burjassot, València, Spain
| | - Lex Winandy
- Department of Microbiology, Karlsruhe Institute of Technology (KIT)-South Campus, Fritz-Haber-Weg 4, D-76131, Karlsruhe, Germany
| | - Reinhard Fischer
- Department of Microbiology, Karlsruhe Institute of Technology (KIT)-South Campus, Fritz-Haber-Weg 4, D-76131, Karlsruhe, Germany
| | - Marcel Li Del Olmo
- Departament de Bioquímica i Biologia Molecular, Facultat de Ciències Biològiques, Universitat de València, Burjassot, València, Spain.
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Kiani M, Du N, Vogel M, Raff J, Hübner U, Skorupa I, Bürger D, Schulz SE, Schmidt OG, Blaschke D, Schmidt H. Disturbing-Free Determination of Yeast Concentration in DI Water and in Glucose Using Impedance Biochips. BIOSENSORS-BASEL 2020; 10:bios10010007. [PMID: 31963826 PMCID: PMC7168218 DOI: 10.3390/bios10010007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/10/2020] [Accepted: 01/16/2020] [Indexed: 02/06/2023]
Abstract
Deionized water and glucose without yeast and with yeast (Saccharomyces cerevisiae) of optical density OD600 that ranges from 4 to 16 has been put in the ring electrode region of six different types of impedance biochips and impedance has been measured in dependence on the added volume (20, 21, 22, 23, 24, 25 µL). The measured impedance of two out of the six types of biochips is strongly sensitive to the addition of both liquid without yeast and liquid with yeast and modelled impedance reveals a linear relationship between the impedance model parameters and yeast concentration. The presented biochips allow for continuous impedance measurements without interrupting the cultivation of the yeast. A multiparameter fit of the impedance model parameters allows for determining the concentration of yeast (cy) in the range from cy = 3.3 × 107 to cy = 17 × 107 cells/mL. This work shows that independent on the liquid, i.e., DI water or glucose, the impedance model parameters of the two most sensitive types of biochips with liquid without yeast and with liquid with yeast are clearly distinguishable for the two most sensitive types of biochips.
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Affiliation(s)
- Mahdi Kiani
- Department Back-End of Line, Fraunhofer Institute for Electronic Nano Systems, Technologie-Campus 3, 09126 Chemnitz, Germany; (D.B.); (S.E.S.)
- Correspondence: (M.K.); (N.D.); (H.S.)
| | - Nan Du
- Department Back-End of Line, Fraunhofer Institute for Electronic Nano Systems, Technologie-Campus 3, 09126 Chemnitz, Germany; (D.B.); (S.E.S.)
- Institute for Solid State Physics, University of Jena, 07743 Jena, Germany
- Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany; (U.H.); (D.B.)
- Correspondence: (M.K.); (N.D.); (H.S.)
| | - Manja Vogel
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany; (M.V.); (J.R.); (I.S.)
| | - Johannes Raff
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany; (M.V.); (J.R.); (I.S.)
| | - Uwe Hübner
- Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany; (U.H.); (D.B.)
| | - Ilona Skorupa
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany; (M.V.); (J.R.); (I.S.)
| | - Danilo Bürger
- Department Back-End of Line, Fraunhofer Institute for Electronic Nano Systems, Technologie-Campus 3, 09126 Chemnitz, Germany; (D.B.); (S.E.S.)
| | - Stefan E. Schulz
- Department Back-End of Line, Fraunhofer Institute for Electronic Nano Systems, Technologie-Campus 3, 09126 Chemnitz, Germany; (D.B.); (S.E.S.)
- Center for Microtechnologies, Chemnitz University of Technology, Reichenhainer Str. 70, 09126 Chemnitz, Germany
| | - Oliver G. Schmidt
- Institute for Integrative Nanosciences IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany;
| | - Daniel Blaschke
- Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany; (U.H.); (D.B.)
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany; (M.V.); (J.R.); (I.S.)
| | - Heidemarie Schmidt
- Department Back-End of Line, Fraunhofer Institute for Electronic Nano Systems, Technologie-Campus 3, 09126 Chemnitz, Germany; (D.B.); (S.E.S.)
- Institute for Solid State Physics, University of Jena, 07743 Jena, Germany
- Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany; (U.H.); (D.B.)
- Correspondence: (M.K.); (N.D.); (H.S.)
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Clementz AL, Manuale D, Sanchez E, Vera C, Yori JC. Use of discards of bovine bone, yeast and carrots for producing second generation bio-ethanol. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2019. [DOI: 10.1016/j.bcab.2019.101392] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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6
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Moreno-García J, Martín-García FJ, Ogawa M, García-Martínez T, Moreno J, Mauricio JC, Bisson LF. FLO1, FLO5 and FLO11 Flocculation Gene Expression Impacts Saccharomyces cerevisiae Attachment to Penicillium chrysogenum in a Co-immobilization Technique. Front Microbiol 2018; 9:2586. [PMID: 30429833 PMCID: PMC6220091 DOI: 10.3389/fmicb.2018.02586] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 10/10/2018] [Indexed: 11/14/2022] Open
Abstract
A reoccurring flaw of most yeast immobilization systems that limits the potential of the technique is leakage of the cells from the matrix. Leakage may be due to weakly adherent cells, deterioration of the matrix, or to new growth and loss of non-adherent daughter cells. Yeast biocapsules are a spontaneous, cost effective system of immobilization whereby Saccharomyces cerevisiae cells are attached to the hyphae of Penicillium chrysogenum, creating hollow spheres that allow recovery and reutilization. This attachment is based on naturally occurring adherent properties of the yeast cell surface. We hypothesized that proteins associated with flocculation might play a role in adherence to fungal hyphae. To test this hypothesis, yeast strains with overexpressed and deleted flocculation genes (FLO1, FLO5, and FLO11) were evaluated for biocapsule formation to observe the impact of gene expression on biocapsule diameter, number, volume, dry mass, and percent immobilized versus non-immobilized cells. Overexpression of all three genes enhanced immobilization and resulted in larger diameter biocapsules. In particular, overexpression of FLO11 resulted in a five fold increase of absorbed cells versus the wild type isogenic strain. In addition, deletion of FLO1 and FLO11 significantly decreased the number of immobilized yeast cells compared to the wild type BY4742. These results confirm the role of natural adherent properties of yeast cells in attachment to fungal hyphae and offer the potential to create strongly adherent cells that will produce adherent progeny thereby reducing the potential for cell leakage from the matrix.
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Affiliation(s)
- Jaime Moreno-García
- Department of Microbiology, University of Córdoba, Córdoba, Spain
- Department of Viticulture and Enology, University of California, Davis, Davis, CA, United States
- Department of Chemistry, Umeå University, Umeå, Sweden
| | | | - Minami Ogawa
- Department of Viticulture and Enology, University of California, Davis, Davis, CA, United States
| | | | - Juan Moreno
- Department of Agricultural Chemistry, University of Córdoba, Córdoba, Spain
| | - Juan C. Mauricio
- Department of Microbiology, University of Córdoba, Córdoba, Spain
| | - Linda F. Bisson
- Department of Viticulture and Enology, University of California, Davis, Davis, CA, United States
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7
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Adhesion Behavior of Microorganisms Isolated from Soil on Hydroxyapatite and Other Materials. Appl Biochem Biotechnol 2018; 187:984-993. [PMID: 30136171 DOI: 10.1007/s12010-018-2861-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 08/07/2018] [Indexed: 10/28/2022]
Abstract
The adhesion behavior of microorganisms on different materials was examined to obtain basic knowledge for designing support materials for microorganisms. The microorganisms were isolated from soil, and their adhesion behavior on hydroxyapatite (HA), carbon-coated HA (Carbon), poly (vinyl chloride) (PVC), and polyurethane (PU) pellets was investigated. The total metabolic activity on and adherence of microorganisms to the tested materials were in the following order: HA > Carbon > PVC > PU. This order was consistent with the extent of hydrophilicity of the materials. Morphological examination and polymerase chain reaction denaturing gradient gel electrophoresis (PCR-DGGE) analysis of microorganisms adhered to the materials revealed that the activities and states of microorganisms were affected by the composition of the pellets. PCR-DGGE analysis revealed various species of microorganisms adhered to the HA pellet. HA ceramics are expected to be one of the most suitable materials for supporting microorganisms.
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Wang L, Liu N, Guo Z, Wu D, Chen W, Chang Z, Yuan Q, Hui M, Wang J. Nitric Acid-Treated Carbon Fibers with Enhanced Hydrophilicity for Candida tropicalis Immobilization in Xylitol Fermentation. MATERIALS 2016; 9:ma9030206. [PMID: 28773330 PMCID: PMC5456695 DOI: 10.3390/ma9030206] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Revised: 03/04/2016] [Accepted: 03/07/2016] [Indexed: 11/16/2022]
Abstract
Nitric acid (HNO3)-treated carbon fiber (CF) rich in hydrophilic groups was applied as a cell-immobilized carrier for xylitol fermentation. Using scanning electron microscopy, we characterized the morphology of the HNO3-treated CF. Additionally, we evaluated the immobilized efficiency (IE) of Candida tropicalis and xylitol fermentation yield by investigating the surface properties of nitric acid treated CF, specifically, the acidic group content, zero charge point, degree of moisture and contact angle. We found that adhesion is the major mechanism for cell immobilization and that it is greatly affected by the hydrophilic–hydrophilic surface properties. In our experiments, we found 3 hto be the optimal time for treating CF with nitric acid, resulting in an improved IE of Candida tropicalis of 0.98 g∙g−1 and the highest xylitol yield and volumetric productivity (70.13% and 1.22 g∙L−1∙h−1, respectively). The HNO3-treated CF represents a promising method for preparing biocompatible biocarriers for multi-batch fermentation.
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Affiliation(s)
- Le Wang
- School of Biological Engineering, Henan University of Technology, Zhengzhou 450001, China.
| | - Na Liu
- School of Biological Engineering, Henan University of Technology, Zhengzhou 450001, China.
| | - Zheng Guo
- College of Textile, Zhongyuan University of Technology, Zhengzhou 450001, China.
| | - Dapeng Wu
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453001, China.
| | - Weiwei Chen
- School of Biological Engineering, Henan University of Technology, Zhengzhou 450001, China.
| | - Zheng Chang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Qipeng Yuan
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Ming Hui
- School of Biological Engineering, Henan University of Technology, Zhengzhou 450001, China.
| | - Jinshui Wang
- School of Biological Engineering, Henan University of Technology, Zhengzhou 450001, China.
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Boons K, Noriega E, Verherstraeten N, David CC, Hofkens J, Van Impe JF. The effect of medium structure complexity on the growth of Saccharomyces cerevisiae in gelatin-dextran systems. Int J Food Microbiol 2015; 199:8-14. [PMID: 25621715 DOI: 10.1016/j.ijfoodmicro.2014.12.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 10/31/2014] [Accepted: 12/14/2014] [Indexed: 11/29/2022]
Abstract
As most food systems are (semi-)solid, the effect of food structure on bacterial growth has been widely acknowledged. However, studies on the growth dynamics of yeasts have neglected the effect of food structure. In this paper, the growth dynamics of the spoilage yeast Saccharomyces cerevisiae was investigated at 23.5 °C in broth, singular, homogeneous biopolymer systems and binary biopolymer systems with a heterogeneous microstructure. The biopolymers gelatin and dextran were used to introduce the different levels of structure. The metabolizing ability of gelatin and dextran by S. cerevisiae was examined. To study microbial behavior in the binary systems at the micro level, mixtures were imaged with confocal laser scanning microscopy (CLSM). Growth dynamics and microscopic images of S. cerevisiae were compared with those obtained for Escherichia coli in the same model system (Boons et al., 2014). Different phase-separated, heterogeneous microstructures were obtained by changing the amount of added gelatin and dextran. Regardless of the microstructure, S. cerevisiae was preferentially located in the dextran phase. Metabolizing ability-tests indicated that gelatin could be consumed by S. cerevisiae but in the presence of glucose, no change in gelatin concentration was observed. No indication of dextran metabolizing ability was observed. When supplementing broth with gelatin or dextran alone, an enhanced growth rate and maximum cell density were observed. This enhancement was further increased by adding a second biopolymer, introducing a heterogeneous microstructure and hence increasing the medium structure complexity. The results obtained indicate that food structure complexity plays a significant role in the growth dynamics of S. cerevisiae, an important food spoiler.
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Affiliation(s)
- Kathleen Boons
- CPMF(2)-Flemish Cluster Predictive Microbiology in Foods, Belgium(1); BioTeC-Chemical and Biochemical Process Technology and Control, Department of Chemical Engineering, KU Leuven, Leuven, Belgium.
| | - Estefanía Noriega
- CPMF(2)-Flemish Cluster Predictive Microbiology in Foods, Belgium(1); BioTeC-Chemical and Biochemical Process Technology and Control, Department of Chemical Engineering, KU Leuven, Leuven, Belgium.
| | - Niels Verherstraeten
- BioTeC-Chemical and Biochemical Process Technology and Control, Department of Chemical Engineering, KU Leuven, Leuven, Belgium.
| | | | - Johan Hofkens
- Molecular Visualization and Photonics, KU Leuven, Leuven, Belgium.
| | - Jan F Van Impe
- CPMF(2)-Flemish Cluster Predictive Microbiology in Foods, Belgium(1); BioTeC-Chemical and Biochemical Process Technology and Control, Department of Chemical Engineering, KU Leuven, Leuven, Belgium.
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10
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Sarjit A, Mei Tan S, A. Dykes G. Surface modification of materials to encourage beneficial biofilm formation. AIMS BIOENGINEERING 2015. [DOI: 10.3934/bioeng.2015.4.404] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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11
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Valeriano VD, Parungao-Balolong MM, Kang DK. In vitro evaluation of the mucin-adhesion ability and probiotic potential of Lactobacillus mucosae LM1. J Appl Microbiol 2014; 117:485-97. [PMID: 24807045 DOI: 10.1111/jam.12539] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 03/23/2014] [Accepted: 03/28/2014] [Indexed: 11/28/2022]
Abstract
AIMS In this report, we characterized the probiotic potential of Lactobacillus mucosae LM1, focusing on its in vitro mucin-adhesion abilities. METHODS AND RESULTS Screening assays were used to evaluate LM1. Previous studies on Lact. mucosae species have been performed, but few have examined the ability of this species to adhere to and colonize the intestinal mucosa. Thus, adhesion, aggregation and pathogen inhibition assays of LM1 along with microbial adhesion to solvents (MATS) assay were carried out in comparison with another putative probiotic, Lactobacillus johnsonii PF01, and the commercial strain, Lactobacillus rhamnosus GG. Based on MATS assay, the cell surfaces of the lactobacilli strains were found to be hydrophobic and highly electron-donating, but the average hydropathy (GRAVY) index of predicted surface-exposed proteins in the LM1 genome indicated that most were hydrophilic. LM1 showed the highest adhesion, aggregation and hydrophobicity among the strains tested and significantly inhibited the adhesion of Escherichia coli K88 and Salmonella enterica serovar Typhimurium KCCM 40253. Correlations among adhesion, aggregation and hydrophobicity, as well as between coaggregation and displacement of E. coli, were observed. CONCLUSIONS Increased adhesion may not always correlate with increased pathogen inhibition due to various strain-specific mechanisms. Nevertheless, LM1 has promising probiotic properties that can be explored further using a genomics approach. SIGNIFICANCE AND IMPACT OF THE STUDY Our data on adhesion of LM1 strain showed a significant correlation between adhesion, hydrophobicity of cell surface and autoaggregation. This study gives basic knowledge for the elucidation of the adhesion mechanism of Lactobacillus sp. and prediction of its adherence in specific host models.
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Affiliation(s)
- V D Valeriano
- Department of Animal Resources Science, Dankook University, Cheonan, Korea
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12
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Kregiel D. Advances in biofilm control for food and beverage industry using organo-silane technology: A review. Food Control 2014. [DOI: 10.1016/j.foodcont.2013.11.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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13
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Borovikova D, Scherbaka R, Patmalnieks A, Rapoport A. Effects of yeast immobilization on bioethanol production. Biotechnol Appl Biochem 2014; 61:33-9. [DOI: 10.1002/bab.1158] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Accepted: 09/17/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Diana Borovikova
- Laboratory of Cell Biology; Institute of Microbiology and Biotechnology; University of Latvia; Riga Latvia
| | - Rita Scherbaka
- Laboratory of Cell Biology; Institute of Microbiology and Biotechnology; University of Latvia; Riga Latvia
| | - Aloizijs Patmalnieks
- Laboratory of Cell Biology; Institute of Microbiology and Biotechnology; University of Latvia; Riga Latvia
| | - Alexander Rapoport
- Laboratory of Cell Biology; Institute of Microbiology and Biotechnology; University of Latvia; Riga Latvia
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14
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Stirke A, Zimkus A, Ramanaviciene A, Balevicius S, Zurauskiene N, Saulis G, Chaustova L, Stankevic V, Ramanavicius A. Electric field-induced effects on yeast cell wall permeabilization. Bioelectromagnetics 2013; 35:136-44. [PMID: 24203648 DOI: 10.1002/bem.21824] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Accepted: 09/19/2013] [Indexed: 11/09/2022]
Abstract
The permeability of the yeast cells (Saccharomyces cerevisiae) to lipophilic tetraphenylphosphonium cations (TPP(+) ) after their treatment with single square-shaped strong electric field pulses was analyzed. Pulsed electric fields (PEF) with durations from 5 to 150 µs and strengths from 0 to 10 kV/cm were applied to a standard electroporation cuvette filled with the appropriate buffer. The TPP(+) absorption process was analyzed using an ion selective microelectrode (ISE) and the plasma membrane permeability was determined by measurements obtained using a calcein blue dye release assay. The viability of the yeast and the inactivation of the cells were determined using the optical absorbance method. The experimental data taken after yeasts were treated with PEF and incubated for 3 min showed an increased uptake of TPP(+) by the yeast. This process can be controlled by setting the amplitude and pulse duration of the applied PEF. The kinetics of the TPP(+) absorption process is described using the second order absolute rate equation. It was concluded that the changes of the charge on the yeast cell wall, which is the main barrier for TPP(+) , is due to the poration of the plasma membrane. The applicability of the TPP(+) absorption measurements for the analysis of yeast cells electroporation process is also discussed.
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Affiliation(s)
- Arunas Stirke
- Center for Physical Sciences and Technology, Vilnius, Lithuania; Center of Nanotechnology and Materials Science-NanoTechnas, Faculty of Chemistry, Vilnius University, Vilnius, Lithuania
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15
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Enhancing adhesion of yeast brewery strains to chamotte carriers through aminosilane surface modification. World J Microbiol Biotechnol 2013; 29:1307-16. [DOI: 10.1007/s11274-013-1294-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 02/13/2013] [Indexed: 01/01/2023]
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16
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Novel permittivity test for determination of yeast surface charge and flocculation abilities. J Ind Microbiol Biotechnol 2012; 39:1881-6. [PMID: 22976039 PMCID: PMC3501174 DOI: 10.1007/s10295-012-1193-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 08/22/2012] [Indexed: 11/16/2022]
Abstract
Yeast flocculation has been found to be important in many biotechnological processes. It has been suggested that flocculation is promoted by decreasing electrostatic repulsion between cells. In this study, we used an unconventional rapid technique—permittivity test—for determination of the flocculation properties and surface charge values of three industrial yeast strains with well-known flocculation characteristics: Saccharomyces cerevisiae NCYC 1017 (brewery, ale), S. pastorianus NCYC 680 (brewery, lager), and Debaryomyces occidentalis LOCK 0251 (unconventional amylolytic yeast). The measurements of permittivity were compared with the results from two classical methods for determination of surface charge: Alcian blue retention and Sephadex DEAE attachment. The permittivity values for particular strains correlated directly with the results of Alcian blue retention (r = 0.9). The results also confirmed a strong negative relationship between the capacitance of yeast suspensions and their flocculation abilities. The highest permittivity was noted for the ale strain NCYC 1017, with weak flocculation abilities, and the lowest for the flocculating lager yeast NCYC 680. This paper is the first to describe the possibility of using a rapid permittivity test to evaluate the surface charge of yeast cells and their flocculation abilities. This method is of practical value in various biotechnological industries where flocculation is applied as a major method of cell separation.
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Kregiel D, Berlowska J, Ambroziak W. Adhesion of yeast cells to different porous supports, stability of cell-carrier systems and formation of volatile by-products. World J Microbiol Biotechnol 2012; 28:3399-408. [PMID: 22903785 PMCID: PMC3486989 DOI: 10.1007/s11274-012-1151-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2012] [Accepted: 08/08/2012] [Indexed: 12/11/2022]
Abstract
The aim of our research was to study how the conditions of immobilization influence cell attachment to two different ceramic surfaces: hydroxylapatite and chamotte tablets. Three fermentative yeast strains, namely brewery TT, B4 (ale, lager) and distillery Bc15a strains belonging to Saccharomyces spp., and one strain of Debaryomyces occidentalis Y500/5 of weak fermentative nature, but with high amylolytic activity due to extracellular α-amylase and glucoamylase, were used in this study. Different media, including cell starvation, were applied for immobilization of yeast strains as well as different phases of cell growth. Immobilization of selected yeasts on a hydroxylapatite carrier was rather weak. However, when incubation of starved yeast cells was conducted in the minimal medium supplemented by calcium carbonate, the scale of immobilization after 24 h was higher, especially for the D. occidentalis strain. Adhesion to hydroxylapatite carriers in wort broth was of reversible character and better results of adhesion were observed in the case of another ceramic carrier-chamotte. The number of immobilized cells was about 106–107 per tablet and cell adhesion was stable during the whole fermentation process. The comparison of the volatile products that were formed during fermentation did not show any significant qualitative and quantitative differences between the free and the immobilized cells. This is the first time when a cheap, porous chamotte surface has been applied to yeast adhesion and fermentation processes.
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Affiliation(s)
- Dorota Kregiel
- Institute of Fermentation Technology and Microbiology, Technical University of Lodz, Wolczanska 171/173, 90-924, Lodz, Poland.
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Pires EJ, Ruiz HA, Teixeira JA, Vicente AA. A new approach on Brewer's spent grains treatment and potential use as lignocellulosic yeast cells carriers. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:5994-5999. [PMID: 22624780 DOI: 10.1021/jf300299m] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The major objective of this work is to improve the pretreatments of brewer's spent grains (BSG) aiming at their use as a source for lignocellulosic yeast carriers (LCYC) production. Therefore, several pretreatments of BSG have been designed aiming at obtaining various yeast carriers, differing on their physicochemical composition. Cellulose, hemicellulose, lignin, fat, protein, and ash content were determined for crude BSG and the LCYCs. The long chain fatty acids profile for the crude BSG was also analyzed. Chemical treatments successfully produced several different LCYC based on BSG. The highest cellulose content in LCYC was achieved upon application of caustic (NaOH) treatment during 40 min. Either caustic or combined acid-caustic treatments predominately generated hydrophobic, negatively charged LCYC. The feasibility of using BSG for LCYC production is strengthened by the fact that added-value byproduct can be extracted before the chemical treatments are applied.
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Affiliation(s)
- Eduardo J Pires
- Department of Biological Engineering, University of Minho , Campus Gualtar, 4710-057, Braga, Portugal
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