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Achache W, Mege JL, Fellag M, Drancourt M. The Enterococcus secretome inhibits the growth of Mycobacterium tuberculosis complex mycobacteria. Access Microbiol 2023; 5:acmi000471.v3. [PMID: 37424563 PMCID: PMC10323786 DOI: 10.1099/acmi.0.000471.v3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 04/03/2023] [Indexed: 07/11/2023] Open
Abstract
Enterococcus mundtii , a commensal intestinal bacterium, was demonstrated to inhibit the growth of some Mycobacterium tuberculosis complex (MTC) species that cause tuberculosis in humans and mammals. To further explore this preliminary observation, we cross-investigated five E. mundtii strains and seven MTC strains representative of four MTC species using a standardized quantitative agar well diffusion assay. All five E. mundtii strains, calibrated at 10 MacFarland, inhibited the growth of all M. tuberculosis strains with various susceptibility profiles, but no inhibition was observed with lower inoculums. Further, eight E. mundtii freeze-dried cell-free culture supernatants (CFCS) inhibited the growth of M. tuberculosis , Mycobacterium africanum, Mycobacterium bovis and Mycobacterium canettii, the most susceptible MTC species (inhibition diameter 25±1 mm), proportionally to CFCS protein concentrations. The data reported here indicate that the E. mundtii secretome inhibited growth of all MTC species of medical interest, which broadens previously reported data. In the gut, the E. mundtii secretome may modulate the expression of tuberculosis, exhibiting an anti-tuberculosis effect, with some protective roles in human and animal health.
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Affiliation(s)
- Wafaa Achache
- Aix-Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France
- IHU Méditerranée Infection, Marseille, France
| | - Jean Louis Mege
- Aix-Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France
- IHU Méditerranée Infection, Marseille, France
| | - Mustapha Fellag
- Aix-Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France
- IHU Méditerranée Infection, Marseille, France
| | - Michel Drancourt
- Aix-Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France
- IHU Méditerranée Infection, Marseille, France
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Ibrahim I, Ayariga JA, Xu J, Boakai RK, Ajayi OS, Owusu-Kwarteng J. A Comparative Study of Skimmed Milk and Cassava Flour on the Viability of Freeze-Dried Lactic Acid Bacteria as Starter Cultures for Yogurt Fermentation. Foods 2023; 12:1207. [PMID: 36981134 PMCID: PMC10048412 DOI: 10.3390/foods12061207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 02/06/2023] [Accepted: 03/10/2023] [Indexed: 03/14/2023] Open
Abstract
The purpose of this study was to evaluate the survival rates and fermentation performance of three freeze-dried lactic acid bacterial cultures previously isolated from Ghanaian traditional fermented milk. LAB cultures, i.e., Lactobacillus delbrueckii, Lactococcus lactis and Leuconostoc mesenteroides, were frozen in the chamber of a Telstar (Lyoquest) laboratory freeze dryer for 10 h at -55 °C (as single and combined cultures) using skimmed milk and cassava flour as cryoprotectants held in plastic or glass cryovials. For viability during storage, freeze-dried LAB cultures were stored in a refrigerator (4 °C) and at room temperature (25 °C) for 4 weeks. The survival of freeze-dried cultures was determined by growth kinetics at 600 nm (OD600). The performance of freeze-dried LAB cultures after 4 weeks of storage was determined by their growth, acidification of milk during yogurt fermentation and consumer sensory evaluation of fermented milk using a nine-point hedonic scale. The survival rates for LAB ranged between 60.11% and 95.4% following freeze-drying. For single cultures, the highest survival was recorded for Lactobacillus delbrueckii (L12), whereas for combined cultures, the highest survival was observed for Lactococcus lactis (L3) combined with Lactobacillus delbrueckii (L12). The consumer acceptability results showed that yogurts produced from a combined starter culture of Lactococcus lactis and Lactobacillus delbrueckii or from a single culture of Lactococcus lactis were the most preferred products with Lactococcus lactis and Lactobacillus delbrueckii possessing high survival rates and high consumer acceptability in yogurt production. These findings are crucial and can be adopted for large-scale production and commercialization of yogurt.
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Affiliation(s)
- Iddrisu Ibrahim
- The Microbiology Program, College of Science, Technology, Engineering, and Mathematics (C-STEM), Alabama State University, Montgomery, AL 36104, USA
| | - Joseph Atia Ayariga
- The Industrial Hemp Program, College of Science, Technology, Engineering, and Mathematics (C-STEM), Alabama State University, Montgomery, AL 36104, USA
| | - Junhuan Xu
- The Industrial Hemp Program, College of Science, Technology, Engineering, and Mathematics (C-STEM), Alabama State University, Montgomery, AL 36104, USA
| | - Robertson K. Boakai
- The Microbiology Program, College of Science, Technology, Engineering, and Mathematics (C-STEM), Alabama State University, Montgomery, AL 36104, USA
| | - Olufemi S. Ajayi
- The Industrial Hemp Program, College of Science, Technology, Engineering, and Mathematics (C-STEM), Alabama State University, Montgomery, AL 36104, USA
| | - James Owusu-Kwarteng
- Department of Food Science and Technology, School of Agriculture and Technology, University of Energy and Natural Resources, Sunyani P.O. Box 214, Ghana
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Antioxidant and Antibacterial Effects of Potential Probiotics Isolated from Korean Fermented Foods. Int J Mol Sci 2022; 23:ijms231710062. [PMID: 36077456 PMCID: PMC9455991 DOI: 10.3390/ijms231710062] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/26/2022] [Accepted: 08/30/2022] [Indexed: 11/25/2022] Open
Abstract
A total of sixteen bacterial strains were isolated and identified from the fourteen types of Korean fermented foods that were evaluated for their in vitro probiotic potentials. The results showed the highest survivability for Bacillus sp. compared to Lactobacillus sp. in simulated gastric pH, and it was found to be maximum for B. inaquosorum KNUAS016 (8.25 ± 0.08 log10 CFU/mL) and minimum for L. sakei KNUAS019 (0.8 ± 0.02 log10 CFU/mL) at 3 h of incubation. Furthermore, B. inaquosorum KNUAS016 and L. brevis KNUAS017 also had the highest survival rates of 6.86 ± 0.02 and 5.37 ± 0.01 log10 CFU/mL, respectively, in a simulated intestinal fluid condition at 4 h of incubation. The percentage of autoaggregation at 6 h for L. sakei KNUAS019 (66.55 ± 0.33%), B. tequilensis KNUAS015 (64.56 ± 0.14%), and B. inaquosorum KNUAS016 (61.63 ± 0.19%) was >60%, whereas it was lower for L. brevis KNUAS017 (29.98 ± 0.09%). Additionally, B. subtilis KNUAS003 showed higher coaggregation at 63.84 ± 0.19% while B. proteolyticus KNUAS001 found at 30.02 ± 0.33%. Among them, Lactobacillus sp. showed the best non-hemolytic activity. The highest DPPH and ABTS radical scavenging activity was observed in L. sakei KNUAS019 (58.25% and 71.88%). The cell-free supernatant of Lactobacillus sp. considerably inhibited pathogenic growth, while the cell-free supernatant of Bacillus sp. was moderately inhibited when incubated for 24 h. However, the overall results found that B. subtilis KNUAS003, B. proteolyticus KNUAS012, L. brevis KNUAS017, L. graminis KNUAS018, and L. sakei KNUAS019 were recognized as potential probiotics through different functional and toxicity assessments.
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Characteristics of Probiotic Preparations and Their Applications. Foods 2022; 11:foods11162472. [PMID: 36010472 PMCID: PMC9407510 DOI: 10.3390/foods11162472] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Revised: 08/03/2022] [Accepted: 08/09/2022] [Indexed: 12/17/2022] Open
Abstract
The probiotics market is one of the fastest growing segments of the food industry as there is growing scientific evidence of the positive health effects of probiotics on consumers. Currently, there are various forms of probiotic products and they can be categorized according to dosage form and the site of action. To increase the effectiveness of probiotic preparations, they need to be specifically designed so they can target different sites, such as the oral, upper respiratory or gastrointestinal tracts. Here we review the characteristics of different dosage forms of probiotics and discuss methods to improve their bioavailability in detail, in the hope that this article will provide a reference for the development of probiotic products.
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Zhao S, Wu F, Ma X, Zhou W. Effect of novel intensification structure on drying of particulate materials in spouted beds. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.07.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Methodological advances and challenges in probiotic bacteria production: Ongoing strategies and future perspectives. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2021.108199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Luo C, Liu Z, Mi S, Cai L, Zhang Z. Comparison of the Design Space of Products with Different Initial Saturation. J Pharm Sci 2021; 111:717-726. [PMID: 34582900 DOI: 10.1016/j.xphs.2021.09.034] [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: 04/29/2021] [Revised: 09/21/2021] [Accepted: 09/22/2021] [Indexed: 11/25/2022]
Abstract
Vacuum freeze-drying is a promising technology widely used in pharmaceuticals. Preparing products with prebuilt porosity has attracted considerable attention due to its potential in shortening process duration. However, the design space for the primary drying of initially unsaturated products remains unclear. A novel index, average power, was proposed in this paper to represents the collapse risk. And a multiphase model was employed in this paper to build the design space for the products with initial voids. The simulation results show that both the drying time and average power show higher sensitivity to the temperature variation than pressure. In addition, the initial saturation has significant impacts on the design space, with small initial saturation resulting in vast design space and vice versa, which implies that small initial saturation is more beneficial for the actual production. This paper would be helpful for the development of freeze-drying.
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Affiliation(s)
- Chun Luo
- School of Energy Science and Engineering, Central South University, Changsha, 410082, China
| | - Zhiqiang Liu
- School of Energy Science and Engineering, Central South University, Changsha, 410082, China.
| | - Sha Mi
- China University of Petroleum - Beijing at Karamay, School of engineering, Xinjiang, 834000, China
| | - Lingling Cai
- China University of Petroleum - Beijing at Karamay, School of engineering, Xinjiang, 834000, China
| | - Zezong Zhang
- School of Energy Science and Engineering, Central South University, Changsha, 410082, China
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Duan H, Wu F, Zhao S, Ma X, Liang W, Ding T. Experimental Investigation of the Swirl Flow Enhancement Effect on the Particle Drying Process in a Novel Spouted Bed. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c02838] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Haojie Duan
- School of Chemical Engineering, Northwest University, Xi’an 710069, China
| | - Feng Wu
- School of Chemical Engineering, Northwest University, Xi’an 710069, China
| | - Shengning Zhao
- School of Chemical Engineering, Northwest University, Xi’an 710069, China
| | - Xiaoxun Ma
- School of Chemical Engineering, Northwest University, Xi’an 710069, China
| | - Wanlong Liang
- School of Chemical Engineering, Northwest University, Xi’an 710069, China
| | - Tangqi Ding
- School of Chemical Engineering, Northwest University, Xi’an 710069, China
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