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Namasivayam SKR, Pandian UK, Samrat K, Arvind Bharani RS, John A, Kavisri M, Kadaikunnan S, Thiruvengadam M, Moovendhan M. Fungal derived herbicidal metabolite loaded starch-chitosan-gum acacia-agar based bio composite: Preparation, characterization, herbicidal activity, release profile and biocompatibility. Int J Biol Macromol 2024; 259:129264. [PMID: 38199548 DOI: 10.1016/j.ijbiomac.2024.129264] [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: 07/28/2023] [Revised: 12/27/2023] [Accepted: 01/03/2024] [Indexed: 01/12/2024]
Abstract
Biocomposites based on starch- gum acacia- agar, chitosan- starch- agar, starch- poly vinyl alcohol- agar were synthesized by simple, green route principles and the various characterization techniques like fourier infrared spectroscopy, SEM revealed the highly stable micro dimenstional that specially interacted with functional groups of polymers -herbicidal metabolites. Respective biocomposite was prepared by mixing equal volume of the selected polymer (1;1;1 ratio) with known concentration (100 mg of in distilled water followed by the addition of reconstituted herbicidal metabolites (100 mg or 0.1 g). Though all the biocomposites were capable of inducing herbicidal effect, notable impact was recorded in chitosan- starch- gum acacia treatment. In this case, the necrotic lesions were initiated at the early incubation period (6 h), progressively developing into dark brownish black lesions with 30.0 mm diameter. Release profile of the metabolites from the respective composite was also under in vitro and soil assay. Release profile study under in vitro and soil condition showed the sustained or controlled manner in distilled water and ethyl acetate treatment. No sign of toxic effect on the soil, parameters plant growth, rhizobacteria and peripheral blood cells clearly revealed the best biocompatibility of the presently proposed biocomposite.
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Affiliation(s)
- S Karthick Raja Namasivayam
- Center for Applied Research, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai 602105, Tamil Nadu, India
| | - U Karthika Pandian
- Centre for Bioresource Research and Development, Department of Biotechnology, Sathyabama Institute of Science and Technology, Chennai 600112, Tamil Nadu, India
| | - K Samrat
- Department of Biotechnology, M.S. Ramaiah Institute of Technology, Bangalore 560054, Karnataka, India
| | - R S Arvind Bharani
- Institute of Obstetrics and Gynaecology, Madras Medical College, Egmore, Chennai-600008, Tamil Nadu, India
| | - Arun John
- Department of Molecular Analytics, Saveetha school of engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai 602105, Tamil Nadu, India
| | - M Kavisri
- Department of Infrastructure Engineering, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai 602195, Tamil Nadu, India
| | - Shine Kadaikunnan
- Department of Botany and Microbiology, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Muthu Thiruvengadam
- Department of Crop Science, College of Sanghuh Life Sciences, Konkuk University, Seoul 05029, South Korea
| | - Meivelu Moovendhan
- Centre for Ocean Research, Sathyabama Research Park, Sathyabama Institute of Science and Technology, Chennai 600119, Tamil Nadu, India..
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Zhu Q, Wu P, Chen B, Wu Q, Cao F, Wang H, Mei Y, Liang Y, Sun X, Chen Z. Improving NH 3 and H 2S removal efficiency with pilot-scale biotrickling filter by co-immobilizing Kosakonia oryzae FB2-3 and Acinetobacter baumannii L5-4. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:33181-33194. [PMID: 36474037 DOI: 10.1007/s11356-022-24426-2] [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: 06/15/2022] [Accepted: 11/23/2022] [Indexed: 06/17/2023]
Abstract
In this study, two NH4+-N and S2- removal strains, namely, Kosakonia oryzae (FB2-3) and Acinetobacter baumannii (L5-4), were isolated from the packing materials in a long-running biotrickling filter (BTF). The removal capacities of combined FB2-3 and L5-4 (FB2-3 + L5-4) toward 100 mg L-1 of NH4+-N and 200 mg L-1 of S2- reached 97.31 ± 1.62% and 98.57 ± 1.12% under the optimal conditions (32.0 °C and initial pH = 7.0), which were higher than those of single strain. Then, FB2-3 and L5-4 liquid inoculums were prepared, and their concentrations respectively reached 1.56 × 109 CFU mL-1 and 1.05 × 109 CFU mL-1 by adding different resuspension solutions and protective agents after 12-week storage at 25 °C. Finally, pilot-scale BTF test showed that NH3 and H2S in the real exhaust gases from a pharmaceutical factory were effectively removed with removal rates > 87% and maximum elimination capacities were reached 136 g (NH3) m-3 h-1 and 176 g (H2S) m-3 h-1 at 18 °C-34 °C and pH 4.0-7.0 in the BTF loaded with bamboo charcoal packing materials co-immobilized with FB2-3 and L5-4. After co-immobilization of FB2-3 and L5-4, in the bamboo charcoal packing materials, the new microbial diversity composition contained the dominant genera of Acinetobacter, Mycobacterium, Kosakonia, and Sulfobacillus was formed, and the diversity of entire bacterial community was decreased, compared to the control. These results indicate that FB2-3 and L5-4 have potential to be developed into liquid ready-to-use inoculums for effectively removing NH3 and H2S from exhaust gases in BTF.
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Affiliation(s)
- Qiuyan Zhu
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Pengyu Wu
- College of Biological and Chemical Engineering, Nanyang Institute of Technology, Nanyang, 473004, People's Republic of China
| | - Budong Chen
- Chuhuan Science and Technology Co., Ltd, Hangzhou, 310000, People's Republic of China
| | - Qijun Wu
- Chuhuan Science and Technology Co., Ltd, Hangzhou, 310000, People's Republic of China
| | - Feifei Cao
- Chuhuan Science and Technology Co., Ltd, Hangzhou, 310000, People's Republic of China
| | - Hao Wang
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Yuxia Mei
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Yunxiang Liang
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Xiaowen Sun
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China
| | - Zhenmin Chen
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China.
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Insight into a Successful Development of Biocontrol Agents: Production, Formulation, Packaging, and Shelf Life as Key Aspects. HORTICULTURAE 2022. [DOI: 10.3390/horticulturae8040305] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
Biocontrol agents (BCAs) have been proposed and studied over recent decades as a suitable alternative to diminish or substitute synthetic fungicides used to control pre- and postharvest diseases. However, the development of BCAs has many constraints and obstacles that would have to be overcome before they could be successfully implemented in the market. For the BCA commercial development, the microorganism should be mass-produced on a large-scale, and, independently of the method used for the production, a particular plan regarding the formulation of BCAs by multidisciplinary approaches (liquid or solid) is required to optimize the yield, efficacy, and shelf life of the developed product. Unfortunately, not all BCAs can survive the conditions imposed during the formulation process. Improved stability can be achieved by either using special conditions during growing or by adding protective substances to the formulation medium. Finally, BCAs should be formulated in such a way as to guarantee long-term stability and ease of application of the product. Therefore, an accurate range of the packaging conditions should be considered to extend the shelf life of the formulated product, preferably up to two years. Herein, we discussed the main aspects regarding the production, formulation, packaging, and shelf life of BCAs.
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4
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Mahmood A, Erum A, Mumtaz S, Tulain UR, Malik NS, Alqahtani MS. Preliminary Investigation of Linum usitatissimum Mucilage-Based Hydrogel as Possible Substitute to Synthetic Polymer-Based Hydrogels for Sustained Release Oral Drug Delivery. Gels 2022; 8:gels8030170. [PMID: 35323283 PMCID: PMC8953505 DOI: 10.3390/gels8030170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/05/2022] [Accepted: 03/06/2022] [Indexed: 12/16/2022] Open
Abstract
The aim of this study was to investigate the potential of Linum usitatissimum mucilage, a natural polymer, in developing a sustained release hydrogel for orally delivered drugs that require frequent dosing. For this purpose, nicorandil (a model drug)-loaded hydrogels with various feed ratios of Linum usitatissimum mucilage, acrylamide (monomer) and methylene bis-acrylamide (crosslinker) were prepared. The newly synthesized hydrogel formulations were probed fundamentally with respect to swelling behaviour, solvent penetration, and the release of the drug from the hydrogels. Later, the selected formulations were further characterized by Fourier-transform infrared spectroscopy, thermal analysis, X-ray diffraction analysis, and scanning electron microscopy. The swelling coefficient demonstrated a linear relation with the polymer ratio; however, an inverse behaviour in the case of monomer and crosslinker was observed. The drug release studies, performed at pH 1.2 and 4.5 and considering the dynamic environment of GIT, demonstrated that all formulations followed the Korsmeyer–Peppas model, displaying a slow drug release via diffusion and polymer erosion. FTIR analysis confirmed the successful grafting of acrylamide on linseed mucilage. Furthermore, scanning electron microscopy revealed a clear surface morphology with folds and pinholes in the hydrogel. Therefore, based upon the in-vitro outcomes, it can be concluded that a promising sustained release hydrogel can be prepared from natural polymer, Linum usitatissimum mucilage, offering many-fold benefits over the conventional synthetic polymers for oral delivery of drugs.
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Affiliation(s)
- Arshad Mahmood
- College of Pharmacy, Al Ain University, Abu Dhabi campus, Abu Dhabi 51133, United Arab Emirates;
- AAU Health and Biomedical Research Center, Al Ain University, Abu Dhabi 51133, United Arab Emirates
| | - Alia Erum
- Faculty of Pharmacy, College of Pharmacy, University of Sargodha, Sargodha 40100, Pakistan; (S.M.); (U.R.T.)
- Correspondence:
| | - Sophia Mumtaz
- Faculty of Pharmacy, College of Pharmacy, University of Sargodha, Sargodha 40100, Pakistan; (S.M.); (U.R.T.)
| | - Ume Ruqia Tulain
- Faculty of Pharmacy, College of Pharmacy, University of Sargodha, Sargodha 40100, Pakistan; (S.M.); (U.R.T.)
| | - Nadia Shamshad Malik
- Faculty of Pharmacy, Capital University of Science and Technology, Islamabad 44000, Pakistan;
| | - Mohammed S. Alqahtani
- Nanobiotechnology Unit, Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11362, Saudi Arabia;
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Onwe RO, Onwosi CO, Ezugworie FN, Ekwealor CC, Okonkwo CC. Microbial trehalose boosts the ecological fitness of biocontrol agents, the viability of probiotics during long-term storage and plants tolerance to environmental-driven abiotic stress. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150432. [PMID: 34560451 DOI: 10.1016/j.scitotenv.2021.150432] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 08/10/2021] [Accepted: 09/14/2021] [Indexed: 06/13/2023]
Abstract
Despite the impressive gain in agricultural production and greater availability of food, a large portion of the world population is affected by food shortages and nutritional imbalance. This is due to abiotic stresses encountered by plants as a result of environmental-driven perturbations, loss of viability of starter cultures (probiotics) for functional foods during storage as well as the vulnerability of farm produce to postharvest pathogens. The use of compatible solutes (e.g., trehalose, proline, etc.) has been widely supported as a solution to these concerns. Trehalose is one of the widely reported microbial- or plant-derived metabolites that help microorganisms (e.g., biocontrol agents, probiotics and plant growth-promoting bacteria) and plants to tolerate harsh environmental conditions. Due to its recent categorization as generally regarded as safe (GRAS), trehalose is an essential tool for promoting nutrition-sensitive agriculture by replacing the overuse of chemical agents (e.g., pesticides, herbicides). Therefore, the current review evaluated the progress currently made in the application of trehalose in sustainable agriculture. The challenges, opportunities, and future of this biometabolite in food security were highlighted.
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Affiliation(s)
- Reuben O Onwe
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Chukwudi O Onwosi
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria; Bioconversion and Renewable Energy Research Unit, University of Nigeria, Nsukka, Enugu State, Nigeria.
| | - Flora N Ezugworie
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria; Bioconversion and Renewable Energy Research Unit, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Chito C Ekwealor
- Department of Applied Microbiology and Brewing, Faculty of Biosciences, Nnamdi Azikiwe University, P.M.B. 5025, Awka, Anambra State, Nigeria
| | - Chigozie C Okonkwo
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria
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Casas-Godoy L, Arellano-Plaza M, Kirchmayr M, Barrera-Martínez I, Gschaedler-Mathis A. Preservation of non-Saccharomyces yeasts: Current technologies and challenges. Compr Rev Food Sci Food Saf 2021; 20:3464-3503. [PMID: 34096187 DOI: 10.1111/1541-4337.12760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 03/05/2021] [Accepted: 03/29/2021] [Indexed: 11/30/2022]
Abstract
There is a recent and growing interest in the study and application of non-Saccharomyces yeasts, mainly in fermented foods. Numerous publications and patents show the importance of these yeasts. However, a fundamental issue in studying and applying them is to ensure an appropriate preservation scheme that allows to the non-Saccharomyces yeasts conserve their characteristics and fermentative capabilities by long periods of time. The main objective of this review is to present and analyze the techniques available to preserve these yeasts (by conventional and non-conventional methods), in small or large quantities for laboratory or industrial applications, respectively. Wine fermentation is one of the few industrial applications of non-Saccharomyces yeasts, but the preservation stage has been a major obstacle to achieve a wider application of these yeasts. This review considers the preservation techniques, and clearly defines parameters such as culturability, viability, vitality and robustness. Several conservation strategies published in research articles as well as patents are analyzed, and the advantages and disadvantages of each technique used are discussed. Another important issue during conservation processes is the stress to which yeasts are subjected at the time of preservation (mainly oxidative stress). There is little published information on the subject for non-Saccharomyces yeast, but it is a fundamental point to consider when designing a preservation strategy.
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Affiliation(s)
- Leticia Casas-Godoy
- Industrial Biotechnology Unit, National Council for Science and Technology-Center for Research and Assistance in Technology and Design of the State of Jalisco, Zapopan, Mexico
| | - Melchor Arellano-Plaza
- Industrial Biotechnology Unit, Center for Research and Assistance in Technology and Design of the State of Jalisco, Zapopan, Mexico
| | - Manuel Kirchmayr
- Industrial Biotechnology Unit, Center for Research and Assistance in Technology and Design of the State of Jalisco, Zapopan, Mexico
| | - Iliana Barrera-Martínez
- Industrial Biotechnology Unit, National Council for Science and Technology-Center for Research and Assistance in Technology and Design of the State of Jalisco, Zapopan, Mexico
| | - Anne Gschaedler-Mathis
- Industrial Biotechnology Unit, Center for Research and Assistance in Technology and Design of the State of Jalisco, Zapopan, Mexico
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7
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The diversity of commercially available ale and lager yeast strains and the impact of brewer's preferential yeast choice on the fermentative beer profiles. Food Res Int 2021; 141:110125. [PMID: 33641992 DOI: 10.1016/j.foodres.2021.110125] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 01/06/2021] [Accepted: 01/07/2021] [Indexed: 11/20/2022]
Abstract
Yeasts from the species Saccharomyces cerevisiae (ale yeast) and Saccharomyces pastorianus (lager yeast) are the main component of beer fermentation. It is known that different beer categories depend on the use of specific ale or lager strains, where the yeast imprints its distinctive fermentative profile to the beer. Despite this, there are no studies reporting how diverse, rich, and homogeneous the beer categories are in terms of commercially available brewing yeast strains. In this work, the diversity, richness, and evenness of different beer categories and commercial yeast strains available for brewing were evaluated by applying quantitative concepts of diversity analysis in a sample of 119,189 beer recipes. For this purpose, the frequency of ale or lager and dry or liquid yeast formulations usage was accessed and its correlation with the number of yeast strains, recipes, lowest and highest values of original and final gravity, international bitter units, and alcohol by volume were analyzed. A statistical framework was applied for comparing the lowest and highest fermentation temperature as well as the attenuation percentage for ale and lager yeasts strains in both dry and liquid formulations. Additionally, the brewer's preferential use of a specific brewing yeast strain in comparison to all different yeast strains reported for a beer category was estimated. The results indicated that many beer categories are preferentially fermented with dry yeast formulations instead of liquid yeasts, despite the high number of available liquid yeast formulations. Finally, the preferential use of specific yeast formulations drives the fermentative diversity of a beer category, showing that many yeast strains are potentially and industrially underexplored.
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Freimoser FM, Rueda-Mejia MP, Tilocca B, Migheli Q. Biocontrol yeasts: mechanisms and applications. World J Microbiol Biotechnol 2019; 35:154. [PMID: 31576429 PMCID: PMC6773674 DOI: 10.1007/s11274-019-2728-4] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 09/17/2019] [Indexed: 01/10/2023]
Abstract
Yeasts occur in all environments and have been described as potent antagonists of various plant pathogens. Due to their antagonistic ability, undemanding cultivation requirements, and limited biosafety concerns, many of these unicellular fungi have been considered for biocontrol applications. Here, we review the fundamental research on the mechanisms (e.g., competition, enzyme secretion, toxin production, volatiles, mycoparasitism, induction of resistance) by which biocontrol yeasts exert their activity as plant protection agents. In a second part, we focus on five yeast species (Candida oleophila, Aureobasidium pullulans, Metschnikowia fructicola, Cryptococcus albidus, Saccharomyces cerevisiae) that are or have been registered for the application as biocontrol products. These examples demonstrate the potential of yeasts for commercial biocontrol usage, but this review also highlights the scarcity of fundamental studies on yeast biocontrol mechanisms and of registered yeast-based biocontrol products. Yeast biocontrol mechanisms thus represent a largely unexplored field of research and plentiful opportunities for the development of commercial, yeast-based applications for plant protection exist.
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Affiliation(s)
- Florian M Freimoser
- Agroscope, Research Division Plant Protection, Müller-Thurgau-Strasse 29, 8820, Wädenswil, Switzerland.
| | - Maria Paula Rueda-Mejia
- Agroscope, Research Division Plant Protection, Müller-Thurgau-Strasse 29, 8820, Wädenswil, Switzerland
| | - Bruno Tilocca
- Dipartimento di Agraria, Università degli Studi di Sassari, Viale Italia 39, 07100, Sassari, Italy
- Department of Health Sciences, University "Magna Græcia" of Catanzaro, Viale Europa, 88100, Catanzaro, Italy
| | - Quirico Migheli
- Dipartimento di Agraria, Università degli Studi di Sassari, Viale Italia 39, 07100, Sassari, Italy
- Istituto Nazionale di Biostrutture e Biosistemi and NRD - Nucleo di Ricerca sulla Desertificazione, Università degli Studi di Sassari, Viale Italia 39, 07100, Sassari, Italy
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Carbó A, Teixidó N, Usall J, Torres R. Verifying the biocontrol activity of novel film-forming formulations of Candida sake CPA-1: resilience in relation to environmental factors, rainfall episodes, and control of Botrytis cinerea on different hosts. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2019; 99:4969-4976. [PMID: 30980409 DOI: 10.1002/jsfa.9731] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 03/19/2019] [Accepted: 04/08/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND The efficacy of Candida sake CPA-1 as a biocontrol agent against several diseases has been studied since it was isolated 20 years ago. However, it was only recently that two suitable and effective film-forming formulations based on potato starch and maltodextrins were developed using the fluidized-bed spray-drying system. The present work aimed to confirm the capability of both novel formulations by testing their resilience on grapes at different temperatures (0, 22, and 30 °C), relative humidities (40% and 85%), and simulated rainfall levels. Another objective was to examine the control of Botrytis cinerea in different hosts. RESULTS The CPA-1 cells from both dried formulations survived better than the liquid formulation on grapes stored at 0 and 22 °C regardless of the relative humidity. After simulated rainfall, potato starch formulation achieved significantly higher populations than maltodextrin formulation, although the highest reduction was -1.6 log N N0 -1 . A positive effect of cell establishment prior to the simulated rainfall was shown, and recovered cells from the potato starch formulation were significantly higher after 72 h of cell establishment. Finally, both formulations reduced the incidence and severity of B. cinerea on pears, apples, and tomatoes. CONCLUSION The potential of these novel film-forming formulations of C. sake CPA-1 was verified. The resilience of formulated C. sake was better than the commercialized liquid formulation, the adherence of the formulations to the grapes improved after an establishment period prior to rain exposure, and the control of B. cinerea was verified in a wider range of hosts. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Anna Carbó
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Catalonia, Spain
| | - Neus Teixidó
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Catalonia, Spain
| | - Josep Usall
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Catalonia, Spain
| | - Rosario Torres
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Catalonia, Spain
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10
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Carbó A, Torres R, Usall J, Marín A, Chiralt A, Teixidó N. Novel film-forming formulations of the biocontrol agent Candida sake CPA-1: biocontrol efficacy and performance at field conditions in organic wine grapes. PEST MANAGEMENT SCIENCE 2019; 75:959-968. [PMID: 30192050 DOI: 10.1002/ps.5200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 08/17/2018] [Accepted: 09/02/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND The biocontrol agent (BCA) Candida sake CPA-1 has previously effectively reduced Botrytis bunch rot (BBR) and it was also suggested as a promising strategy to control sour rot in grapes under field conditions. However, biocontrol efficacy of solid formulations of CPA-1 has never been tested in field trials. The present study aims to confirm the efficacy against BBR and sour rot in grapes under field conditions of two novel formulations recently developed by the addition of biodegradable coatings using a fluidized-bed spray-drying system. RESULTS Novel film-forming formulations of the BCA C. sake CPA-1 controlled B. cinerea as well as liquid formulation. Sour rot control resulted better in the second season and severity reductions were more satisfactory than incidence control. Visual and cryoSEM observations revealed that film-forming treatments were uniformly distributed on plant surfaces. CPA-1 coating could be observed on grapes at harvest time. CONCLUSION The results of this work suggest that solid formulations would be a competitive alternative to conventional fungicides because they were easy to package and transport, and cell viability could be maintained for a long period of time. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Anna Carbó
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Spain
| | - Rosario Torres
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Spain
| | - Josep Usall
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Spain
| | - Anna Marín
- Departamento de Tecnología de Alimentos, Instituto de Ingeniería de Alimentos para el Desarrollo, Universitat Politècnica de València, Valencia, Spain
| | - Amparo Chiralt
- Departamento de Tecnología de Alimentos, Instituto de Ingeniería de Alimentos para el Desarrollo, Universitat Politècnica de València, Valencia, Spain
| | - Neus Teixidó
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Spain
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11
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Carbó A, Torres R, Teixidó N, Usall J, Medina A, Magan N. Impact of climate change environmental conditions on the resilience of different formulations of the biocontrol agentCandida sakeCPA-1 on grapes. Lett Appl Microbiol 2018; 67:2-8. [DOI: 10.1111/lam.12889] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 03/22/2018] [Accepted: 03/23/2018] [Indexed: 11/30/2022]
Affiliation(s)
- A. Carbó
- IRTA; XaRTA-Postharvest; Edifici Fruitcentre; Parc Científic i Tecnològic Agroalimentari de Lleida; Lleida Catalonia Spain
| | - R. Torres
- IRTA; XaRTA-Postharvest; Edifici Fruitcentre; Parc Científic i Tecnològic Agroalimentari de Lleida; Lleida Catalonia Spain
| | - N. Teixidó
- IRTA; XaRTA-Postharvest; Edifici Fruitcentre; Parc Científic i Tecnològic Agroalimentari de Lleida; Lleida Catalonia Spain
| | - J. Usall
- IRTA; XaRTA-Postharvest; Edifici Fruitcentre; Parc Científic i Tecnològic Agroalimentari de Lleida; Lleida Catalonia Spain
| | - A. Medina
- Applied Mycology Group; Cranfield Soil and AgriFood Institute; Cranfield University; Cranfield Bedford UK
| | - N. Magan
- Applied Mycology Group; Cranfield Soil and AgriFood Institute; Cranfield University; Cranfield Bedford UK
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Fluidised-bed spray-drying formulations of Candida sake CPA-1 by adding biodegradable coatings to enhance their survival under stress conditions. Appl Microbiol Biotechnol 2017; 101:7865-7876. [DOI: 10.1007/s00253-017-8529-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 08/02/2017] [Accepted: 09/07/2017] [Indexed: 01/11/2023]
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Carbó A, Torres R, Usall J, Fons E, Teixidó N. Dry formulations of the biocontrol agent Candida sake CPA-1 using fluidised bed drying to control the main postharvest diseases on fruits. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:3691-3698. [PMID: 28111760 DOI: 10.1002/jsfa.8229] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 01/15/2017] [Accepted: 01/17/2017] [Indexed: 06/06/2023]
Abstract
BACKGROUND The biocontrol agent Candida sake CPA-1 is effective against several diseases. Consequently, the optimisation of a dry formulation of C. sake to improve its shelf life and manipulability is essential for increasing its potential with respect to future commercial applications. The present study aimed to optimise the conditions for making a dry formulation of C. sake using a fluidised bed drying system and then to determine the shelf life of the optimised formulation and its efficacy against Penicillium expansum on apples. RESULTS The optimal conditions for the drying process were found to be 40 °C for 45 min and the use of potato starch as the carrier significantly enhanced the viability. However, none of the protective compounds tested increased the viability of the dried cells. A temperature of 25 °C for 10 min in phosphate buffer was considered as the optimum condition to recover the dried formulations. The dried formulations should be stored at 4 °C and air-packaged; moreover, shelf life assays indicated good results after 12 months of storage. The formulated products maintained their biocontrol efficacy. CONCLUSION A fluidised bed drying system is a suitable process for dehydrating C. sake cells; moreover, the C. sake formulation is easy to pack, store and transport, and is a cost-effective process. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Anna Carbó
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Catalonia, Spain
| | - Rosario Torres
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Catalonia, Spain
| | - Josep Usall
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Catalonia, Spain
| | - Estanislau Fons
- Food Technology Department, Lleida University, XaRTA-Postharvest, Agrotecnio Center, Lleida, Catalonia, Spain
| | - Neus Teixidó
- IRTA, XaRTA-Postharvest, Edifici Fruitcentre, Parc Científic i Tecnològic Agroalimentari de Lleida, Lleida, Catalonia, Spain
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Cray JA, Connor MC, Stevenson A, Houghton JDR, Rangel DEN, Cooke LR, Hallsworth JE. Biocontrol agents promote growth of potato pathogens, depending on environmental conditions. Microb Biotechnol 2016; 9:330-54. [PMID: 26880001 PMCID: PMC4835571 DOI: 10.1111/1751-7915.12349] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Revised: 12/29/2015] [Accepted: 12/31/2015] [Indexed: 11/30/2022] Open
Abstract
There is a pressing need to understand and optimize biological control so as to avoid over‐reliance on the synthetic chemical pesticides that can damage environmental and human health. This study focused on interactions between a novel biocontrol‐strain, Bacillus sp. JC12GB43, and potato‐pathogenic Phytophthora and Fusarium species. In assays carried out in vitro and on the potato tuber, the bacterium was capable of near‐complete inhibition of pathogens. This Bacillus was sufficiently xerotolerant (water activity limit for growth = 0.928) to out‐perform Phytophthora infestans (~0.960) and challenge Fusarium coeruleum (~0.847) and Fusarium sambucinum (~0.860) towards the lower limits of their growth windows. Under some conditions, however, strain JC12GB43 stimulated proliferation of the pathogens: for instance, Fusarium coeruleum growth‐rate was increased under chaotropic conditions in vitro (132 mM urea) by >100% and on tubers (2‐M glycerol) by up to 570%. Culture‐based assays involving macromolecule‐stabilizing (kosmotropic) compatible solutes provided proof‐of‐principle that the Bacillus may provide kosmotropic metabolites to the plant pathogen under conditions that destabilize macromolecular systems of the fungal cell. Whilst unprecedented, this finding is consistent with earlier reports that fungi can utilize metabolites derived from bacterial cells. Unless the antimicrobial activities of candidate biocontrol strains are assayed over a full range of field‐relevant parameters, biocontrol agents may promote plant pathogen infections and thereby reduce crop yields. These findings indicate that biocontrol activity, therefore, ought to be regarded as a mode‐of‐behaviour (dependent on prevailing conditions) rather than an inherent property of a bacterial strain.
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Affiliation(s)
- Jonathan A Cray
- Institute for Global Food Security, School of Biological Sciences, MBC, Queen's University Belfast, Belfast, BT9 7BL, Northern Ireland
| | - Mairéad C Connor
- Institute for Global Food Security, School of Biological Sciences, MBC, Queen's University Belfast, Belfast, BT9 7BL, Northern Ireland
| | - Andrew Stevenson
- Institute for Global Food Security, School of Biological Sciences, MBC, Queen's University Belfast, Belfast, BT9 7BL, Northern Ireland
| | - Jonathan D R Houghton
- Institute for Global Food Security, School of Biological Sciences, MBC, Queen's University Belfast, Belfast, BT9 7BL, Northern Ireland
| | - Drauzio E N Rangel
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, GO, 74605-050, Brazil
| | - Louise R Cooke
- Agri-Food & Biosciences Institute (AFBI), Newforge Lane, Belfast, BT9 5PX, Northern Ireland
| | - John E Hallsworth
- Institute for Global Food Security, School of Biological Sciences, MBC, Queen's University Belfast, Belfast, BT9 7BL, Northern Ireland
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Sui Y, Wisniewski M, Droby S, Liu J. Responses of yeast biocontrol agents to environmental stress. Appl Environ Microbiol 2015; 81:2968-75. [PMID: 25710368 PMCID: PMC4393439 DOI: 10.1128/aem.04203-14] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Biological control of postharvest diseases, utilizing wild species and strains of antagonistic yeast species, is a research topic that has received considerable attention in the literature over the past 30 years. In principle, it represents a promising alternative to chemical fungicides for the management of postharvest decay of fruits, vegetables, and grains. A yeast-based biocontrol system is composed of a tritrophic interaction between a host (commodity), a pathogen, and a yeast species, all of which are affected by environmental factors such as temperature, pH, and UV light as well as osmotic and oxidative stresses. Additionally, during the production process, biocontrol agents encounter various severe abiotic stresses that also impact their viability. Therefore, understanding the ecological fitness of the potential yeast biocontrol agents and developing strategies to enhance their stress tolerance are essential to their efficacy and commercial application. The current review provides an overview of the responses of antagonistic yeast species to various environmental stresses, the methods that can be used to improve stress tolerance and efficacy, and the related mechanisms associated with improved stress tolerance.
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Affiliation(s)
- Yuan Sui
- School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei, China
| | - Michael Wisniewski
- U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Kearneysville, West Virginia, USA
| | - Samir Droby
- Agricultural Research Organization (ARO), The Volcani Center, Bet Dagan, Israel
| | - Jia Liu
- School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei, China
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Torres R, Solsona C, Viñas I, Usall J, Plaza P, Teixidó N. Optimization of packaging and storage conditions of a freeze-dried Pantoea agglomerans
formulation for controlling postharvest diseases in fruit. J Appl Microbiol 2014; 117:173-84. [DOI: 10.1111/jam.12511] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 03/24/2014] [Accepted: 03/26/2014] [Indexed: 11/30/2022]
Affiliation(s)
- R. Torres
- IRTA; XaRTA-Postharvest; Lleida Catalonia Spain
| | - C. Solsona
- IRTA; XaRTA-Postharvest; Lleida Catalonia Spain
| | - I. Viñas
- Food Technology Department; Lleida University; XaRTA-Postharvest; Agrotecnio Center; Lleida Catalonia Spain
| | - J. Usall
- IRTA; XaRTA-Postharvest; Lleida Catalonia Spain
| | - P. Plaza
- IRTA; XaRTA-Postharvest; Lleida Catalonia Spain
| | - N. Teixidó
- IRTA; XaRTA-Postharvest; Lleida Catalonia Spain
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17
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Liu J, Sui Y, Wisniewski M, Droby S, Liu Y. Review: Utilization of antagonistic yeasts to manage postharvest fungal diseases of fruit. Int J Food Microbiol 2013; 167:153-60. [DOI: 10.1016/j.ijfoodmicro.2013.09.004] [Citation(s) in RCA: 321] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 09/02/2013] [Accepted: 09/10/2013] [Indexed: 01/30/2023]
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Wang YS, Wang ZY. Sodium citrate induces apoptosis in biocontrol yeast Cryptococcus laurentii. J Appl Microbiol 2012; 113:135-42. [PMID: 22515564 DOI: 10.1111/j.1365-2672.2012.05312.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIM To provide the observation that sodium citrate induced apoptosis in biocontrol yeast Cryptococcus laurentii. METHODS AND RESULTS The viability of the yeast cells was evaluated using the percentage of colony-forming units (CFU) of treated cells. The induction of cell death was dependent on the concentration of sodium citrate and exhibited typical apoptotic markers such as phosphatidylserine (PS) translocation as shown by annexin V coupled with fluorescein isothiocyanate (FITC) labelling and DNA fragmentation as detected by TdT-mediated dUTP-biotin nick end labelling (TUNEL) assay. The annexin V-positive cells reached the maximum (14·8%) on the third day, whereas TUNEL-positive cells increased gradually from 5·92 to 27·9% within 5 days of incubation in sodium citrate. In addition, confocal laser microscopy and flow cytometric analysis revealed that the induction of apoptosis was associated with the production of reactive oxygen species (ROS) that reached the highest intracellular level in the first day, before the peak of the early event (PS exposure) in apoptosis. The apoptosis was delayed by the addition of antioxidant glutathione (GSH), suggesting that ROS generated in this process plays a key role in the regulation of the apoptosis in C. laurentii cells. CONCLUSIONS This study indicated that the apoptotic signals in C. laurentii are dependent on citrate ions and/or sodium ions, the concentration and initial acidity of sodium citrate. Induction of ROS in response to sodium citrate plays a significant role in apoptosis. SIGNIFICANCE AND IMPACT OF THE STUDY Yeast Cryptococcus laurentii has been selected as an effective biocontrol indicator for the postharvest diseases because of its competition for nutrients and space with the pathogen in the wound of fruits. This study presents a convenient method for commercial production of yeast as biocontrol agent.
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Affiliation(s)
- Y-S Wang
- Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients, School of Food and Chemical Engineering, Beijing Technology and Business University, Beijing, China.
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Nopcharoenkul W, Pinphanichakarn P, Pinyakong O. The development of a liquid formulation of Pseudoxanthomonas sp. RN402 and its application in the treatment of pyrene-contaminated soil. J Appl Microbiol 2011; 111:36-47. [PMID: 21518158 DOI: 10.1111/j.1365-2672.2011.05037.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIM To develop a liquid formulation of Pseudoxanthomonas sp. RN402 for prolonged storage and maintaining high survival rates and pyrene biodegradability. METHODS AND RESULTS Liquid formulations of RN402, designated as L-RN402, were prepared by suspending bacterial cells (10⁹ CFU ml⁻¹) in various buffers. Analysis found that phosphate buffer containing glycerol maintained high survival rate (94%) as well as pyrene biodegradability of bacteria after a 30-day storage. This L-RN402 could be stored at 30°C for at least 6 months. Bioaugmentation treatment with stored L-RN402 resulted in the complete degradation of pyrene (300 mg kg⁻¹) in soil microcosms within 4 weeks. RN402 could be detected by denaturing gradient gel electrophoresis throughout the period; moreover, real-time PCR indicated the presence of high number of nidA-containing bacteria. CONCLUSIONS A liquid formulation of RN402, an effective pyrene degrader, was developed by suspending RN402 in phosphate buffer containing 1% glycerol. This formulation could be stored at 30°C for at least 6 months and maintain high efficacy in the treatment of pyrene-contaminated soil. SIGNIFICANCE AND IMPACT OF THE STUDY This work is the first description of a liquid formulation of pyrene-degrading bacteria for prolonged storage that retains biological activity for the treatment of environmental pollutants.
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Affiliation(s)
- W Nopcharoenkul
- Inter-department of Environmental Science, Graduate School, Chulalongkorn University, Bangkok, Thailand
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Melin P, Schnürer J, Håkansson S. Formulation and stabilisation of the biocontrol yeast Pichia anomala. Antonie van Leeuwenhoek 2010; 99:107-12. [DOI: 10.1007/s10482-010-9522-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2010] [Accepted: 10/05/2010] [Indexed: 10/18/2022]
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21
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Morales H, Marín S, Ramos AJ, Sanchis V. Influence of post-harvest technologies applied during cold storage of apples in Penicillium expansum growth and patulin accumulation: A review. Food Control 2010. [DOI: 10.1016/j.foodcont.2009.12.016] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Hernández A, Weekers F, Mena J, Pimentel E, Zamora J, Borroto C, Thonart P. Culture and spray-drying of Tsukamurella paurometabola C-924: stability of formulated powders. Biotechnol Lett 2007; 29:1723-8. [PMID: 17603774 DOI: 10.1007/s10529-007-9436-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2007] [Revised: 06/04/2007] [Accepted: 06/05/2007] [Indexed: 11/28/2022]
Abstract
The nematocidal agent, Tsukamurella paurometabola C-924, was cultured in a 300 l bioreactor. Spray-dried formulations of this microorganism were prepared using sucrose. At an outlet temperature 62 degrees C, survival rates between 12 and 85% were reached with sucrose up to 10% (w/w). The stability study of the powders showed that the best storage condition was at 4 degrees C under vacuum. A new method for the calculation of cell death order for bacteria stored at low temperatures was developed. Powders stored under vacuum showed an Arrhenius behavior in relation to cell death kinetics.
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Affiliation(s)
- Armando Hernández
- Center for Genetic Engineering and Biotechnology, P.O. Box 387, Camaguey, 70100, Cuba.
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23
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Melin P, Sundh I, Håkansson S, Schnürer J. Biological preservation of plant derived animal feed with antifungal microorganisms: safety and formulation aspects. Biotechnol Lett 2007; 29:1147-54. [PMID: 17479224 DOI: 10.1007/s10529-007-9375-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2007] [Revised: 03/14/2007] [Accepted: 03/19/2007] [Indexed: 11/26/2022]
Abstract
During storage of moist animal feed, growth of detrimental fungi causing spoilage, or being mycotoxigenic or pathogenic, is a severe problem. Addition of biopreservative yeasts or lactic acid bacteria can significantly reduce this problem. However, their use requires several careful considerations. One is the safety to the animal, humans and the environment, tightly connected to legal aspects and the need for pre-market authorisation when supplementing feed with microorganisms. Although both yeasts and lactic acid bacteria are considered comparatively safe organisms due to low production of toxic metabolites, it is of great importance to understand the mechanisms behind the biopreservative abilities. Another important issue concerns practical aspects, such as the economic production of large amounts of the organisms and the development of a suitable formulation giving the organisms a long shelf life. These aspects are discussed and a recommendation of this review is that both safety and formulation aspects of a specific microbe should be considered at an early stage in the selection of new organisms with biopreservation potential.
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Affiliation(s)
- Petter Melin
- Department of Microbiology, Swedish University of Agricultural Sciences, P.O. Box 7025, Uppsala, 750 07, Sweden.
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24
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Latorre-García L, del Castillo-Agudo L, Polaina J. Taxonomical classification of yeasts isolated from kefir based on the sequence of their ribosomal RNA genes. World J Microbiol Biotechnol 2006. [DOI: 10.1007/s11274-006-9298-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Torres R, Teixidó N, Viñas I, Mari M, Casalini L, Giraud M, Usall J. Efficacy of Candida sake CPA-1 formulation for controlling Penicillium expansum decay on pome fruit from different Mediterranean regions. J Food Prot 2006; 69:2703-11. [PMID: 17133815 DOI: 10.4315/0362-028x-69.11.2703] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The effectiveness of a formulated product of the yeast Candida sake CPA-1 for controlling postharvest diseases on pome fruits was demonstrated in laboratory, semicommercial, and commercial trials carried out in the major pome fruit producing region of the European Union. First, one wettable powder and seven liquid formulations were tested in laboratory trials that involved two varieties of apples and two varieties of pears. In all cases, an efficacy similar to that of fresh cells was demonstrated in the control of artificial Penicillium expansum infection. After these trials, the formulated product chosen for semicommercial and commercial trials was LF1, a liquid formulation that is particularly suitable for commercial applications. In semicommercial trials, LF1 showed a performance similar to fresh cells in most trials, and the population dynamics of both fresh and formulated cells were quite stable throughout the storage period. This indicates the high viability of C. sake CPA-1 in this formulation and the absence of adverse effects during the formulation of the product, which may significantly affect both its ability to grow on fruit and its antagonistic activity. We evaluated the control of natural infection after applying the formulated product in a commercial drencher in different packinghouses. A significant reduction in the incidence of diseases was observed with a recommended dose of around 10(7) CFU/ml when natural infections were greater than 1%. In general, large quantities of yeast were observed on the surface of unwounded fruits of different pome fruit cultivars. Moreover, populations of this biocontrol agent increased rapidly on fruit surfaces and remained quite stable for a long time under commercial storage conditions. Commercial practices used in packinghouses were therefore successfully applied for this formulated product.
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Affiliation(s)
- R Torres
- Postharvest Unit, Institute of Agro-Food Research and Technology (IRTA), Centre UdL (University of Lleida)-IRTA, Av. Rovira Roure, 191. 25198 Lleida, Catalonia, Spain.
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Melin P, Håkansson S, Eberhard TH, Schnürer J. Survival of the biocontrol yeast Pichia anomala after long-term storage in liquid formulations at different temperatures, assessed by flow cytometry. J Appl Microbiol 2006; 100:264-71. [PMID: 16430502 DOI: 10.1111/j.1365-2672.2005.02778.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS Investigate the survival of liquid formulations of the biocontrol yeast Pichia anomala J121 at different temperatures, and develop a system for comparative studies of different storage conditions and formulations. METHODS AND RESULTS The survival of P. anomala in liquid formulations with lactose, starch and trehalose amendments was measured during prolonged storage at temperatures ranging from -20 to +30 degrees C. The relative survival of the stored cells was rapidly estimated by flow cytometry. After 4 weeks incubation at 4 and 10 degrees C, 75-90% of the cells were viable, with no significant differences between the various formulations. Supplementing the storage buffer with lactose or trehalose increased the survival after longer incubations (8 and 12 weeks) at all temperatures (-20 to 30 degrees C). Trehalose was the most effective protectant at 20 and 30 degrees C (>20% viable cells after 12 weeks at 20 degrees C). The biocontrol activity was maintained after formulation and prolonged storage of P. anomala. CONCLUSIONS The storage potential of liquid formulated P. anomala cells can be increased by supplementation with lactose or trehalose. The combination of a custom made incubation chamber and flow cytometry was suitable to evaluate stability of P. anomala formulations. SIGNIFICANCE AND IMPACT OF THE STUDY Liquid formulated P. anomala have a long shelf life. The developed test system can be used to study different formulations of other biocontrol agents.
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Affiliation(s)
- P Melin
- Department of Microbiology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
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Patiño-Vera M, Jiménez B, Balderas K, Ortiz M, Allende R, Carrillo A, Galindo E. Pilot-scale production and liquid formulation of Rhodotorula minuta, a potential biocontrol agent of mango anthracnose. J Appl Microbiol 2005; 99:540-50. [PMID: 16108795 DOI: 10.1111/j.1365-2672.2005.02646.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
AIMS To develop a pilot-plant fermentation process for the production of the yeast Rhodotorula minuta, to be used as a biocontrol agent of mango anthracnose, using a low-cost culture medium. To develop a stable liquid formulation that preserve high viability of the yeast stored at 4 degrees C. METHODS AND RESULTS Keeping constant the volumetric power input, a fermentation process was scaled-up from shake flasks to a 100 l bioreactor. Preharvest applications of the yeast resulted in postharvest anthracnose severity equal or lower than that observed with a chemical fungicide. Glycerol was added to the formulation as water activity reducer and xanthan gum as a viscosity-enhancing agent. Yeast initial concentration of 10(10) CFU ml(-1) resulted in 4-5 orders of magnitude decrease after 1 month of storage at 4 degrees C, whereas when it was formulated at 10(9) CFU ml(-1), the decrease was of two orders of magnitude in 6 months. CONCLUSIONS The fermentation process was successfully scaled-up using a low-cost culture medium. Postharvest anthracnose severity could be considerably reduced using this yeast. Formulating the yeast at 10(9) CFU ml(-1) and adding glycerol (20%) and xanthan (5 g l(-1)) avoided both contamination and yeast sedimentation and it was able to preserve up to 10(7) CFU ml(-1) after 6 months at 4 degrees C. SIGNIFICANCE AND IMPACT OF THE STUDY The yeast R. minuta is reported as a novel antagonistic micro-organism against the pathogen Colletotrichum gloeosporioides. Pilot plant production of this yeast allowed us to conduct field tests in commercial orchards during three harvest seasons. Yeast suspensions applied to mango trees reduced the fruit anthracnose severity in levels similar or better than chemical fungicides.
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Affiliation(s)
- M Patiño-Vera
- Scaling-up and Pilot Plant Unit, Department of Cellular Engineering and Biocatalysis, Institute of Biotechnology, National University of Mexico, Box 510-3, Cuernavaca 62250, Morelos, Mexico
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28
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Current awareness on yeast. Yeast 2003; 20:653-60. [PMID: 12769126 DOI: 10.1002/yea.945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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