1
|
Dudek K, Guzmán CLÁ, Valdez-Vazquez I. Microbial activity of lactic acid bacteria and hydrogen producers mediated by pH and total solids during the consolidated bioprocessing of agave bagasse. World J Microbiol Biotechnol 2024; 40:70. [PMID: 38225443 PMCID: PMC10789659 DOI: 10.1007/s11274-024-03888-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 01/08/2024] [Indexed: 01/17/2024]
Abstract
Lactic acid bacteria (LAB) coexist with Clostridium spp. in hydrogen production processes from complex substrates; however, the role of LAB is still unclear. This study analyzed the fermentation products in a wide range of initial pH (pHi, 5.5-6.9) and total solids (TS%, 8-22%) to determine the activity of these two microbial groups over time (from 24 to 120 h). Agave bagasse served as the feedstock for hydrogen production via consolidated bioprocess (CBP), while the inoculum source was the indigenous mature microbiota. In the early stage of the CBP, hydrogen production from lactic acid occurred only at pHi ≥ 6.0 (ρ = 0.0004) with no effect of TS%; lactic acid accumulated below this pHi value. In this stage, lactic acid production positively correlated with a first cluster of LAB represented by Paucilactobacillus (r = 0.64) and Bacillus (r = 0.81). After 72 h, hydrogen production positively correlated with a second group of LAB led by Enterococcus (r = 0.71) together with the hydrogen producer Clostridium sensu stricto 1 (r = 0.8) and the acetogen Syntrophococcus (r = 0.52) with the influence of TS% (ρ < 0.0001). A further experiment showed that buffering the pH to 6.5 increased and lengthened the lactic acid production, doubling the hydrogen production from 20 to 41 mL H2/gTSadded. This study confirmed the prevalence of distinct groups of LAB over time, whose microbial activity promoted different routes of hydrogen production.
Collapse
Affiliation(s)
- Karol Dudek
- Instituto de Ingeniería, Unidad Académica Juriquilla, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro, 76230, Mexico
| | - Cecilia Lizeth Álvarez Guzmán
- Instituto de Ingeniería, Unidad Académica Juriquilla, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro, 76230, Mexico
| | - Idania Valdez-Vazquez
- Instituto de Ingeniería, Unidad Académica Juriquilla, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro, 76230, Mexico.
| |
Collapse
|
2
|
Luo L, Mak KL, Mal J, Khanal SK, Pradhan N. Effect of zero-valent iron nanoparticles on taxonomic composition and hydrogen production from kitchen waste. Bioresour Technol 2023; 387:129578. [PMID: 37506933 DOI: 10.1016/j.biortech.2023.129578] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 07/20/2023] [Accepted: 07/25/2023] [Indexed: 07/30/2023]
Abstract
This study investigated the effects of varying zero-valent iron (ZVI) (0 to 5,000 mg/L) on fermentative hydrogen (H2) production, metabolic pattern, and taxonomic profile by using kitchen waste as substrate. The study demonstrated that the supplementation of 500 mg ZVI/L resulted in the highest H2 yield (219.68 ± 11.19 mL H2/g-volatile solids (VS)added), which was 19% higher than the control. The metabolic pattern analysis showed that acetic and butyric acid production primarily drove the H2 production. The taxonomic analysis further revealed that Firmicutes (relative abundance (RA): 80-96%) and Clostridium sensu stricto 1 (RA: 68-88%) were the dominant phyla and genera, respectively, during the exponential gas production phase, supporting the observation of accumulation of acetic and butyric acids. These findings suggest that supplementation of ZVI can enhance H2 production from organic waste and significantly influence the metabolic pattern and taxonomic profile, including the metalloenzymes.
Collapse
Affiliation(s)
- Lijun Luo
- Department of Biology, Faculty of Science, Hong Kong Baptist University, Kowloon Tong, Hong Kong Special Administrative Region.
| | - Ka Lee Mak
- Department of Biology, Faculty of Science, Hong Kong Baptist University, Kowloon Tong, Hong Kong Special Administrative Region.
| | - Joyabrata Mal
- Department of Biotechnology, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, Uttar Pradesh, India.
| | - Samir Kumar Khanal
- Department of Molecular Biosciences and Bioengineering, University of Hawai'i at Mānoa, Honolulu, HI 96822, USA.
| | - Nirakar Pradhan
- Department of Biology, Faculty of Science, Hong Kong Baptist University, Kowloon Tong, Hong Kong Special Administrative Region.
| |
Collapse
|
3
|
Cheung MK, Leung TF, Tam WH, Leung ASY, Chan OM, Ng RWY, Yau JWK, Yuen LY, Tong SLY, Ho WCS, Yeung ACM, Chen Z, Chan PKS. Development of the early-life gut microbiome and associations with eczema in a prospective Chinese cohort. mSystems 2023; 8:e0052123. [PMID: 37646516 PMCID: PMC10654104 DOI: 10.1128/msystems.00521-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 07/20/2023] [Indexed: 09/01/2023] Open
Abstract
IMPORTANCE Eczema is a major allergic disease in children, which is particularly prevalent in Chinese children during their first year of life. In this study, we showed that alterations in the infant gut microbiota precede the development of eczema in a prospective Chinese cohort. In particular, we discovered enrichments of the genera Clostridium sensu stricto 1 and Finegoldia in the cases at 3 and 1 month of age, respectively, which may represent potential targets for intervention to prevent eczema. Besides, we identified a depletion of Bacteroides from 1 to 6 months of age and an enrichment of Clostridium sensu stricto 1 at 3 months in the eczema cases, patterns also observed in C-section-born infants within the same time frames, providing first evidence to support a role of the gut microbiota in previously reported associations between C-section and increased risk of eczema in infancy.
Collapse
Affiliation(s)
- Man Kit Cheung
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Ting Fan Leung
- Department of Paediatrics, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
- Centre for Gut Microbiota Research, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Wing Hung Tam
- Centre for Gut Microbiota Research, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Agnes S. Y. Leung
- Department of Paediatrics, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Oi Man Chan
- Department of Paediatrics, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Rita W. Y. Ng
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
- Centre for Gut Microbiota Research, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Jennifer W. K. Yau
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Lai-yuk Yuen
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Sylvia L. Y. Tong
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Wendy C. S. Ho
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Apple C. M. Yeung
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Zigui Chen
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
- Centre for Gut Microbiota Research, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| | - Paul K. S. Chan
- Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
- Centre for Gut Microbiota Research, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, Hong Kong, China
| |
Collapse
|
4
|
Melendez Hebib V, Taft DH, Stoll B, Liu J, Call L, Guthrie G, Jensen N, Hair AB, Mills DA, Burrin DG. Probiotics and Human Milk Differentially Influence the Gut Microbiome and NEC Incidence in Preterm Pigs. Nutrients 2023; 15:2585. [PMID: 37299550 PMCID: PMC10255242 DOI: 10.3390/nu15112585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 05/24/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023] Open
Abstract
Necrotizing enterocolitis (NEC) is the leading cause of death caused by gastrointestinal disease in preterm infants. Major risk factors include prematurity, formula feeding, and gut microbial colonization. Microbes have been linked to NEC, yet there is no evidence of causal species, and select probiotics have been shown to reduce NEC incidence in infants. In this study, we evaluated the effect of the probiotic Bifidobacterium longum subsp. infantis (BL. infantis), alone and in combination with a human milk oligosaccharide (HMO)-sialylactose (3'SL)-on the microbiome, and the incidence of NEC in preterm piglets fed an infant formula diet. We studied 50 preterm piglets randomized between 5 treatments: (1) Preterm infant formula, (2) Donor human milk (DHM), (3) Infant formula + 3'SL, (4) Infant formula + BL. infantis, and (5) Infant formula and BL. infantis + 3'SL. NEC incidence and severity were assessed through the evaluation of tissue from all the segments of the GI tract. The gut microbiota composition was assessed both daily and terminally through 16S and whole-genome sequencing (WGS) of rectal stool samples and intestinal contents. Dietary BL. infantis and 3'SL supplementation had no effect, yet DHM significantly reduced the incidence of NEC. The abundance of BL. infantis in the gut contents negatively correlated with disease severity. Clostridium sensu stricto 1 and Clostridium perfringens were significantly more abundant in NEC and positively correlated with disease severity. Our results suggest that pre- and probiotics are not sufficient for protection from NEC in an exclusively formula-based diet. The results highlight the differences in microbial species positively associated with both diet and NEC incidence.
Collapse
Affiliation(s)
- Valeria Melendez Hebib
- USDA Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA; (V.M.H.); (B.S.); (L.C.); (G.G.)
| | - Diana H. Taft
- Foods for Health Institute, University of California, Davis, CA 95616, USA; (D.H.T.); (J.L.); (N.J.); (D.A.M.)
- Department of Food Science and Technology, University of California, Davis, CA 95616, USA
| | - Barbara Stoll
- USDA Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA; (V.M.H.); (B.S.); (L.C.); (G.G.)
| | - Jinxin Liu
- Foods for Health Institute, University of California, Davis, CA 95616, USA; (D.H.T.); (J.L.); (N.J.); (D.A.M.)
- Department of Food Science and Technology, University of California, Davis, CA 95616, USA
- Laboratory of Gastrointestinal Microbiology, Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Lee Call
- USDA Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA; (V.M.H.); (B.S.); (L.C.); (G.G.)
| | - Gregory Guthrie
- USDA Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA; (V.M.H.); (B.S.); (L.C.); (G.G.)
| | - Nick Jensen
- Foods for Health Institute, University of California, Davis, CA 95616, USA; (D.H.T.); (J.L.); (N.J.); (D.A.M.)
- Department of Food Science and Technology, University of California, Davis, CA 95616, USA
| | - Amy B. Hair
- Section of Neonatology, Departments of Pediatrics, Baylor College of Medicine, Texas Children’s Hospital, Houston, TX 77030, USA;
| | - David A. Mills
- Foods for Health Institute, University of California, Davis, CA 95616, USA; (D.H.T.); (J.L.); (N.J.); (D.A.M.)
- Department of Food Science and Technology, University of California, Davis, CA 95616, USA
| | - Douglas G. Burrin
- USDA Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA; (V.M.H.); (B.S.); (L.C.); (G.G.)
| |
Collapse
|