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Wang Y, Liu R, Xie Z, Du L, Wang Y, Han J, Zhang L. Structure characterization and immunological activity of capsular polysaccharide from live and heat-killed Lacticaseibacillus paracasei 6235. Int J Biol Macromol 2024; 277:134010. [PMID: 39032891 DOI: 10.1016/j.ijbiomac.2024.134010] [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: 02/01/2024] [Revised: 06/22/2024] [Accepted: 07/17/2024] [Indexed: 07/23/2024]
Abstract
Capsular polysaccharide (CPS) as a probiotic component has the ability to regulate the function of the host's immune system. However, how the structure and function of heat-killed CPS are altered remains unclear. In the present study, CPS were isolated and purified from live (LCPS) and heat-killed (HCPS) Lacticaseibacillus paracasei 6235. The differences in structure and immunomodulation between LCPS and HCPS were compared and analyzed. The results demonstrate that after heat killed, the molecular weight of CPS decreased from 23.4 kDa to 17.5 kDa, with the disappearance of galactosamine in the monosaccharide composition, and changes in the microstructure. Methylation analysis and nuclear magnetic resonance analysis revealed that the LCPS and HCPS are similar in structure, which main units of →3,4)-α-D-Glcp-(1→4)-α-D-Galp-(1→3)-β-L-Rhap-(1→6)-β-D-Galp-(1→, and repeating units of →3,4)-α-D-Glcp-(1→, →3)-β-L-Rhap-(1→, and →4)-α-D-Galp-(1→ residues. Furthermore, both LCPS and HCPS significantly downregulated the expression of pro-inflammatory cytokines in RAW264.7 cells induced by LPS. Specifically, HCPS reduced the levels of IL-6 and IL-1β by 79.38 % and 88.42 %, respectively, compared to LCPS. Concurrently, both LCPS and HCPS effectively mitigated inflammatory responses through the NF-κB and MAPK signaling pathways. Moreover, compared to LCPS, HCPS increased the protein expression levels of NF-κB/p-NF-κB and IκB/p-IκB by 26.14 % and 28.92 %, respectively. These results suggest that CPS has a role in modulating immune responses and that HCPS is more effective. This study can be further developed into new products related to postbiotics.
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Affiliation(s)
- Yucong Wang
- College of Food Science, Northeast Agricultural University, Harbin 150030, China
| | - Rongxu Liu
- Heilongjiang Green Food Science Research Institute, Harbin 150030, China
| | - Zhixin Xie
- College of Food Science, Northeast Agricultural University, Harbin 150030, China
| | - Lei Du
- College of Food Science, Northeast Agricultural University, Harbin 150030, China
| | - Yingnan Wang
- Heilongjiang Green Food Science Research Institute, Harbin 150030, China
| | - Jianchun Han
- College of Food Science, Northeast Agricultural University, Harbin 150030, China; Heilongjiang Green Food Science Research Institute, Harbin 150030, China.
| | - Lili Zhang
- College of Food Science, Northeast Agricultural University, Harbin 150030, China.
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Yu J, Chen Z, Zhou Q, Li P, Wu S, Zhou T, Gu Q. Exopolysaccharide from Lacticaseibacillus paracasei alleviates gastritis in Helicobacter pylori-infected mice by regulating gastric microbiota. Front Nutr 2024; 11:1426358. [PMID: 38978704 PMCID: PMC11228268 DOI: 10.3389/fnut.2024.1426358] [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: 05/01/2024] [Accepted: 06/07/2024] [Indexed: 07/10/2024] Open
Abstract
Introduction Many probiotics have the ability to produce extracellular polysaccharides (EPS). EPS derived from these probiotics has been confirmed to regulate the host intestinal microecological balance and alleviate the symptoms of diseases caused by gastrointestinal microecological imbalance. Results Lactic acid bacteria (LAB) strain with good exopolysaccharide (EPS) producing ability, namely, Lacticaseibacillus paracasei ZFM54 (L. paracasei ZFM54) was screened. The fermentation conditions of L. paracasei ZFM54 for EPS production were optimized. The EPS54 was characterized by chemical component and monosaccharide composition determination, UV, FT-IR and NMR spectra analysis. Cango red, SEM, AFM and XRD analysis were conducted to characterize the structure of EPS54. The EPS54 effectively reduced the colonization of Helicobacter pylori to AGS cells and recovered the cell morphology. EPS54 could also effectively alleviate the gastritis in the H. pylori-infected mice by down-regulating the mRNA expression levels of pro-inflammatory cytokines IL-6, IL-8, IL-1β and TNF-α and up-regulating the mRNA expression of inflammatory cytokine IL-10 in gastric cells. EPS54 was also found to be able to positively regulate the structure of gastric microbiota. Conclusion The EPS 54 from L. paracasei ZFM54 can alleviate gastritis in H. pylori-infected mice by modulating the gastric microbiota.
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Affiliation(s)
- Jianxing Yu
- Zhejiang Key Laboratory of Food Microbiology and Nutritional Health, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, China
| | - Ziqi Chen
- Zhejiang Key Laboratory of Food Microbiology and Nutritional Health, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Qingqing Zhou
- Zhejiang Key Laboratory of Food Microbiology and Nutritional Health, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Ping Li
- Zhejiang Key Laboratory of Food Microbiology and Nutritional Health, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Shiying Wu
- Zhejiang Key Laboratory of Food Microbiology and Nutritional Health, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Tao Zhou
- Zhejiang Key Laboratory of Food Microbiology and Nutritional Health, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Qing Gu
- Zhejiang Key Laboratory of Food Microbiology and Nutritional Health, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
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Akhtar N, Wani AK, Sharma NR, Sanami S, Kaleem S, Machfud M, Purbiati T, Sugiono S, Djumali D, Retnaning Prahardini PE, Purwati RD, Supriadi K, Rahayu F. Microbial exopolysaccharides: Unveiling the pharmacological aspects for therapeutic advancements. Carbohydr Res 2024; 539:109118. [PMID: 38643705 DOI: 10.1016/j.carres.2024.109118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 04/15/2024] [Accepted: 04/15/2024] [Indexed: 04/23/2024]
Abstract
Microbial exopolysaccharides (EPSs) have emerged as a fascinating area of research in the field of pharmacology due to their diverse and potent biological activities. This review paper aims to provide a comprehensive overview of the pharmacological properties exhibited by EPSs, shedding light on their potential applications in various therapeutic areas. The review begins by introducing EPSs, exploring their various sources, significance in microbial growth and survival, and their applications across different industries. Subsequently, a thorough examination of the pharmaceutical properties of microbial EPSs unveils their antioxidant, immunomodulatory, antimicrobial, antidepressant, antidiabetic, antiviral, antihyperlipidemic, hepatoprotective, anti-inflammatory, and anticancer activities. Mechanistic insights into how different EPSs exert these therapeutic effects have also been discussed in this review. The review also provides comprehensive information about the monosaccharide composition, backbone, branches, glycosidic bonds, and molecular weight of pharmacologically active EPSs from various microbial sources. Furthermore, the factors that can affect the pharmacological activities of EPSs and approaches to improve the EPSs' pharmacological activity have also been discussed. In conclusion, this review illuminates the immense pharmaceutical promise of microbial EPS as versatile bioactive compounds with wide-ranging therapeutic applications. By elucidating their structural features, biological activities, and potential applications, this review aims to catalyze further research and development efforts in leveraging the pharmaceutical potential of microbial EPS for the advancement of human health and well-being, while also contributing to sustainable and environmentally friendly practices in the pharmaceutical industry.
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Affiliation(s)
- Nahid Akhtar
- School of Bioengineering and Biosciences, Lovely Professional University, Phagwara, (144411), Punjab, India
| | - Atif Khurshid Wani
- School of Bioengineering and Biosciences, Lovely Professional University, Phagwara, (144411), Punjab, India.
| | - Neeta Raj Sharma
- School of Bioengineering and Biosciences, Lovely Professional University, Phagwara, (144411), Punjab, India
| | - Samira Sanami
- Health Promotion Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Shaikh Kaleem
- School of Bioengineering and Biosciences, Lovely Professional University, Phagwara, (144411), Punjab, India
| | - Moch Machfud
- Research Center for Estate Crops, National Research and Innovation Agency, Bogor, (16911), Indonesia
| | - Titiek Purbiati
- Research Center for Horticulture, National Research and Innovation Agency, Bogor, (16911), Indonesia
| | - Sugiono Sugiono
- Research Center for Horticulture, National Research and Innovation Agency, Bogor, (16911), Indonesia
| | - Djumali Djumali
- Research Center for Estate Crops, National Research and Innovation Agency, Bogor, (16911), Indonesia
| | | | - Rully Dyah Purwati
- Research Center for Estate Crops, National Research and Innovation Agency, Bogor, (16911), Indonesia
| | - Khojin Supriadi
- Research Center for Food Crops, National Research and Innovation Agency, Bogor, (16911), Indonesia
| | - Farida Rahayu
- Research Center for Genetic Engineering, National Research and Innovation Agency, Bogor, (16911), Indonesia
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Tan X, Cui F, Wang D, Lv X, Li X, Li J. Fermented Vegetables: Health Benefits, Defects, and Current Technological Solutions. Foods 2023; 13:38. [PMID: 38201066 PMCID: PMC10777956 DOI: 10.3390/foods13010038] [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: 11/30/2023] [Revised: 12/17/2023] [Accepted: 12/19/2023] [Indexed: 01/12/2024] Open
Abstract
This review summarizes current studies on fermented vegetables, analyzing the changes in nutritional components during pickling, the health benefits of fermented vegetables, and their safety concerns. Additionally, the review provides an overview of the applications of emergent non-thermal technologies for addressing these safety concerns during the production and processing of fermented vegetables. It was found that vitamin C would commonly be lost, the soluble protein would degrade into free amino acids, new nutrient compositions would be produced, and the flavor correlated with the chemical changes. These changes would be influenced by the variety/location of raw materials, the original bacterial population, starter cultures, fermentation conditions, seasoning additions, and post-fermentation processing. Consuming fermented vegetables benefits human health, including antibacterial effects, regulating intestinal bacterial populations, and promoting health (anti-cancer effects, anti-diabetes effects, and immune regulation). However, fermented vegetables have chemical and biological safety concerns, such as biogenic amines and the formation of nitrites, as well as the existence of pathogenic microorganisms. To reduce hazardous components and control the quality of fermented vegetables, unique starter cultures, high pressure, ultrasound, cold plasma, photodynamic, and other technologies can be used to solve these problems.
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Affiliation(s)
- Xiqian Tan
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China (X.L.); (J.L.)
- National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou 121013, China
| | - Fangchao Cui
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China (X.L.); (J.L.)
- National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou 121013, China
| | - Dangfeng Wang
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China (X.L.); (J.L.)
- National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou 121013, China
| | - Xinran Lv
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China (X.L.); (J.L.)
- National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou 121013, China
| | - Xuepeng Li
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China (X.L.); (J.L.)
- National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou 121013, China
| | - Jianrong Li
- College of Food Science and Technology, Bohai University, Jinzhou 121013, China (X.L.); (J.L.)
- National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou 121013, China
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Kingkaew E, Woraprayote W, Booncharoen A, Niwasabutra K, Janyaphisan T, Vilaichone RK, Yamaoka Y, Visessanguan W, Tanasupawat S. Functional genome analysis and anti-Helicobacter pylori activity of a novel bacteriocinogenic Lactococcus sp. NH2-7C from Thai fermented pork (Nham). Sci Rep 2023; 13:20362. [PMID: 37990119 PMCID: PMC10663479 DOI: 10.1038/s41598-023-47687-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 11/16/2023] [Indexed: 11/23/2023] Open
Abstract
Helicobacter pylori, linked to gastric diseases, is targeted for probiotic treatment through bacteriocin production. Bacteriocins have gained recognition for their non-toxic effects on host cells and their ability to combat a wide range of pathogens. This study aimed to taxonomically characterize and evaluate the safety and probiotic properties of the novel species of Lactococcus sp. NH2-7C isolated from fermented pork, as well as its bacteriocin NH2-7C, both in vitro and in silico. Comparative genotypic analysis revealed an average nucleotide identity of 94.96%, an average amino acid identity of 94.29%, and a digital DNA-DNA hybridization value of 63.80% when compared to Lactococcus lactis subsp. lactis JCM 5805T. These findings suggest that strain NH2-7C represents a novel species within the genus Lactococcus. In silico assessments confirmed the non-pathogenic nature of strain NH2-7C and the absence of genes associated with virulence and biogenic amine formation. Whole-genome analysis revealed the presence of the nisA gene responsible for nisin A production, indicating its potential as a beneficial compound with anti-Helicobacter pylori activity and non-toxic characteristics. Probiotic assessments indicated bile salt hydrolase and cholesterol assimilation activities, along with the modulation of interleukin-6 and tumour necrosis factor-α secretion. Strain NH2-7C demonstrated gastrointestinal tolerance and the ability to adhere to Caco-2 cells, affirming its safety and probiotic potential. Additionally, its ability to produce bacteriocins supports its suitability as a functional probiotic strain with therapeutic potential. However, further in vitro and in vivo investigations are crucial to ensure its safety and explore potential applications for Lactococcus sp. NH2-7C as a probiotic agent.
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Affiliation(s)
- Engkarat Kingkaew
- Department of Biology, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand
- Department of Biochemistry and Microbiology, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Weerapong Woraprayote
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand
| | - Auttaporn Booncharoen
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand
| | - Kanidta Niwasabutra
- Thailand Institute of Scientific and Technological Research (TISTR) Biodiversity Research Centre, Pathum Thani, 12120, Thailand
| | - Thitiphorn Janyaphisan
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand
| | - Ratha-Korn Vilaichone
- GI Unit, Department of Medicine, and Center of Excellence in Digestive Diseases, Thammasat University, Thailand Science Research and Innovation Fundamental Fund, Bualuang ASEAN Chair Professorship at Thammasat University, Pathum Thani, 12120, Thailand
| | - Yoshio Yamaoka
- Department of Environmental and Preventive Medicine, Faculty of Medicine Oita University, Yufu, Oita, Japan
| | - Wonnop Visessanguan
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand.
| | - Somboon Tanasupawat
- Department of Biochemistry and Microbiology, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok, 10330, Thailand.
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Srinivash M, Krishnamoorthi R, Mahalingam PU, Malaikozhundan B. Exopolysaccharide from Lactococcus hircilactis CH4 and Lactobacillus delbrueckii GRIPUMSK as new therapeutics to treat biofilm pathogens, oxidative stress and human colon adenocarcinoma. Int J Biol Macromol 2023; 250:126171. [PMID: 37558015 DOI: 10.1016/j.ijbiomac.2023.126171] [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: 01/31/2023] [Revised: 08/01/2023] [Accepted: 08/05/2023] [Indexed: 08/11/2023]
Abstract
Naturally occurring biopolymers like exopolysaccharides (EPS) secreted by lactic acid bacteria (LAB) has gained significant attention as they are cost effective, renewable and safe. In order to prevent the rapid increase in antibiotic resistant bacteria, the EPS of LAB offers novel approach of targeting the antibiotic resistant pathogens by limiting their effects on environment. Accordingly, in this study, the production, purification, characterization and biological properties of exopolysaccharides from Lactococcus hircilactis strain CH4 and Lactobacillus delbrueckii strain GRIPUMSK were performed. The optimization of lactic acid bacterial strains for exopolysaccharide production was done by response surface methodology and changing the carbon sources in the growth media. The carbohydrate and protein of exopolysaccharide 1 were 79.7 % and 8.7 % respectively and exopolysaccharide 2 were 75.2 % and 9.3 % respectively. When compared with the commercial emulsifier sodium dodecyl sulfate, both the exopolysaccharides have shown good emulsifying activity. Both the exopolysaccharides were linear homo-polysaccharide as determined by Fourier transform infrared spectroscopy and Nuclear magnetic resonance spectra. Scanning electron microscopy showed that the exopolysaccharides were porous and capable of holding water. The exopolysaccharides were partially crystalline as confirmed by X-ray diffraction spectra. Exopolysaccharides from L. hircilactis and L. delbrueckii exhibited significant antimicrobial activity against H. pylori, S. flexneri, S. pyogenes, E. faecalis and C. albicans. Both the exopolysaccharides revealed significant 2,2-diphenyl-1-picrylhydrazyl and hydrogen peroxide scavenging ability with the IC50 value of 100 μg/ml and 80 μg/ml respectively. Exopolysaccharides from L. hircilactis and L. delbrueckii at 100 μg/ml showed significant anticancer activity on HT-29 cells with 58.4 % and 58.7 % respectively. These findings proved that exopolysaccharides from the two selected lactic acid bacterial strains could be explored as natural bioactive carbohydrate polymer for biomedical applications.
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Affiliation(s)
- Moovendran Srinivash
- Department of Biology, The Gandhigram Rural Institute (Deemed to be University), Gandhigram, Dindigul 624302, Tamil Nadu, India
| | - Raman Krishnamoorthi
- Plant Pathology Division, Indian Cardamom Research Institute, Spices Board (Ministry of Commerce and Industry, Government of India), Myladumpara- 685553, Idukki, Kerala, India.
| | - Pambayan Ulagan Mahalingam
- Department of Biology, The Gandhigram Rural Institute (Deemed to be University), Gandhigram, Dindigul 624302, Tamil Nadu, India.
| | - Balasubramanian Malaikozhundan
- Department of Biology, The Gandhigram Rural Institute (Deemed to be University), Gandhigram, Dindigul 624302, Tamil Nadu, India
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Baryshnikova NV, Ilina AS, Ermolenko EI, Uspenskiy YP, Suvorov AN. Probiotics and autoprobiotics for treatment of Helicobacter pylori infection. World J Clin Cases 2023; 11:4740-4751. [PMID: 37583996 PMCID: PMC10424037 DOI: 10.12998/wjcc.v11.i20.4740] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 06/07/2023] [Accepted: 06/21/2023] [Indexed: 07/06/2023] Open
Abstract
The article discusses various approaches for probiotic treatment of Helicobacter pylori (H. pylori) infection: Probiotics as an adjuvant treatment in the standard eradication therapy; probiotic strains as a monotherapy; and autoprobiotics as a monotherapy. Autoprobiotics refer to indigenous bifidobacteria, lactobacilli, or enterococci isolated from a specific individual, intended to restore his/her microbiota and improve his/her health. The potential mechanisms of probiotic action against H. pylori include correction of the gut microbiota, immunological effects (enhancement of humoral and cellular immunity, and reduction of oxidative stress), direct antagonistic effects against H. pylori (such as colonization resistance and bacteriocin synthesis), and stimulation of local immunological protection (strengthening of the mucous protective barrier and reduction of gastric mucosa inflammation). The incorporation of probiotics into comprehensive eradication therapy shows promise in optimizing the treatment of H. pylori infection. Probiotics can enhance the eradication rates of H. pylori, reduce the occurrence and severity of side effects, and improve patient compliance. Probiotic or autoprobiotic monotherapy can be considered as an alternative treatment approach in cases of allergic reactions and insufficient effectiveness of antibiotics. We recommend including probiotics as adjunctive medications in anti-H. pylori regimens. However, further randomized multicenter studies are necessary to investigate the effects of probiotics and autoprobiotics against H. pylori, in order to gain a better understanding of their mechanisms of action.
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Affiliation(s)
- Natalia V Baryshnikova
- Department of Molecular Microbiology, Institute of Experimental Medicine, St. Petersburg 197376, Russia
- Internal Diseases Department of Stomatological Faculty, Pavlov First St-Petersburg State Medical University, St. Petersburg 197022, Russia
- Laboratory of Medical and Social Pediatric Problems, St-Petersburg State Pediatric Medical University, St. Petersburg 194100, Russia
| | - Anastasia S Ilina
- Clinical Department, Institute of Experimental Medicine, St. Petersburg 197376, Russia
| | - Elena I Ermolenko
- Department of Molecular Microbiology, Institute of Experimental Medicine, St. Petersburg 197376, Russia
| | - Yury P Uspenskiy
- Internal Diseases Department of Stomatological Faculty, Pavlov First St-Petersburg State Medical University, St. Petersburg 197022, Russia
- Department of Faculty Therapy Named After V.A. Valdman, St-Petersburg State Pediatric Medical University, St. Petersburg 194100, Russia
| | - Alexander N Suvorov
- Department of Molecular Microbiology, Institute of Experimental Medicine, St. Petersburg 197376, Russia
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Screening and Characteristics of Marine Bacillus velezensis Z-1 Protease and Its Application of Enzymatic Hydrolysis of Mussels to Prepare Antioxidant Active Substances. Molecules 2022; 27:molecules27196570. [PMID: 36235106 PMCID: PMC9572009 DOI: 10.3390/molecules27196570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 09/28/2022] [Accepted: 09/30/2022] [Indexed: 11/07/2022] Open
Abstract
Bacillus velezensis is a type of microorganism that is beneficial to humans and animals. In this work, a protease-producing B. velezensis strain Z-1 was screened from sludge in the sea area near Qingdao (deposit number CGMCC No. 25059). The response surface methodology was used to analyze protease production, and the optimal temperature was 37.09 °C and pH 7.73 with the addition of 0.42% NaCl, resulting in maximum protease production of 17.64 U/mL. The optimum reaction temperature and pH of the protease of strain Z-1 were 60 °C and 9.0, respectively. The protease had good temperature and pH stability, and good stability in solvents such as methanol, ethanol and Tween 80. Ammonium, NH4+,and Mn2+ significantly promoted enzyme activity, while Zn2+ significantly inhibited the enzyme activity. The protease produced by strain Z-1 was used for the enzymolysis of mussel meat. The mussel hydrolysate exhibited good antioxidant function, with a DPPH free radical removal rate of 75.3%, a hydroxyl free radical removal rate of 75.9%, and a superoxide anion removal rate of 84.4%. This study provides a reference for the application of B. velez protease and the diverse processing applications of mussel meat.
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Biological Functions of Exopolysaccharides from Lactic Acid Bacteria and Their Potential Benefits for Humans and Farmed Animals. Foods 2022; 11:foods11091284. [PMID: 35564008 PMCID: PMC9101012 DOI: 10.3390/foods11091284] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 04/18/2022] [Accepted: 04/25/2022] [Indexed: 02/04/2023] Open
Abstract
Lactic acid bacteria (LAB) synthesize exopolysaccharides (EPS), which are structurally diverse biopolymers with a broad range of technological properties and bioactivities. There is scientific evidence that these polymers have health-promoting properties. Most commercialized probiotic microorganisms for consumption by humans and farmed animals are LAB and some of them are EPS-producers indicating that some of their beneficial properties could be due to these polymers. Probiotic LAB are currently used to improve human health and for the prevention and treatment of specific pathologic conditions. They are also used in food-producing animal husbandry, mainly due to their abilities to promote growth and inhibit pathogens via different mechanisms, among which the production of EPS could be involved. Thus, the aim of this review is to discuss the current knowledge of the characteristics, usage and biological role of EPS from LAB, as well as their postbiotic action in humans and animals, and to predict the future contribution that they could have on the diet of food animals to improve productivity, animal health status and impact on public health.
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