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Tlais AZA, Polo A, Granehäll L, Filannino P, Vincentini O, De Battistis F, Di Cagno R, Gobbetti M. Sugar lowering in fermented apple-pear juice orchestrates a promising metabolic answer in the gut microbiome and intestinal integrity. Curr Res Food Sci 2024; 9:100833. [PMID: 39290653 PMCID: PMC11406026 DOI: 10.1016/j.crfs.2024.100833] [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: 05/17/2024] [Revised: 07/29/2024] [Accepted: 08/29/2024] [Indexed: 09/19/2024] Open
Abstract
Excessive sugar consumption in young people, who are the major consumers of sugary drinks, combined with limited physical activity, is an important determinant of obesity. Despite their natural appeal, fruit juices have a similar sugar content to that of sugary drinks and once metabolized, they may induce the same biological response. This study aimed to verify whether fermentation processes can make juice consumption healthier and whether reduced-sugar juices have a specific impact on intestinal function. We designed a tailored fermentation of apple-pear juices with lactic acid bacteria and yeasts, which resulted in a reduction of sugar content (27-66%) and caloric intake, and an increase in mannitol content. The impact of newly developed apple-pear juices on gut microbiome composition and functionality was evaluated in vitro using the Simulator of the Human Intestinal Microbial Ecosystem (SHIME). Promising changes were found in the gut microbiota and its metabolic responses and functionality, targeting pathways related to obesity and weight loss (lipopolysaccharide and secondary metabolite biosynthesis, polycyclic aromatic hydrocarbon degradation, and amino sugar and nucleotide sugar metabolism). Additionally, the fermented apple-pear juices positively modulated the intestinal epithelial features. While the simulation of the study simplifies the complex in vivo conditions, it suggests that low-sugar fermented apple-pear juices can elicit targeted responses in the gut ecosystem, contributing to healthier alternatives to traditional fruit juices.
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Affiliation(s)
- Ali Zein Alabiden Tlais
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano-Bozen, 39100, Bolzano, Italy
- International Center on Food Fermentation, 39100, Bolzano, Italy
| | - Andrea Polo
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano-Bozen, 39100, Bolzano, Italy
- International Center on Food Fermentation, 39100, Bolzano, Italy
| | - Lena Granehäll
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano-Bozen, 39100, Bolzano, Italy
| | - Pasquale Filannino
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, 70121, Bari, Italy
- International Center on Food Fermentation, 39100, Bolzano, Italy
| | - Olimpia Vincentini
- U.O Alimentazione, Nutrizione e Salute, Dipartimento Sicurezza Alimentare, Nutrizione e Sanità Pubblica Veterinaria, Istituto Superiore di Sanità, 00161, Roma, Italy
| | - Francesca De Battistis
- U.O Alimentazione, Nutrizione e Salute, Dipartimento Sicurezza Alimentare, Nutrizione e Sanità Pubblica Veterinaria, Istituto Superiore di Sanità, 00161, Roma, Italy
| | - Raffaella Di Cagno
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano-Bozen, 39100, Bolzano, Italy
- International Center on Food Fermentation, 39100, Bolzano, Italy
| | - Marco Gobbetti
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano-Bozen, 39100, Bolzano, Italy
- International Center on Food Fermentation, 39100, Bolzano, Italy
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Nikoloudaki O, Aheto F, Di Cagno R, Gobbetti M. Synthetic microbial communities: A gateway to understanding resistance, resilience, and functionality in spontaneously fermented food microbiomes. Food Res Int 2024; 192:114780. [PMID: 39147468 DOI: 10.1016/j.foodres.2024.114780] [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: 02/10/2024] [Revised: 06/25/2024] [Accepted: 07/14/2024] [Indexed: 08/17/2024]
Abstract
This review delves into the intricate traits of microbial communities encountered in spontaneously fermented foods (SFF), contributing to resistance, resilience, and functionality drivers. Traits of SFF microbiomes comprise of fluctuations in community composition, genetic stability, and condition-specific phenotypes. Synthetic microbial communities (SMCs) serve as a portal for mechanistic insights and strategic re-programming of microbial communities. Current literature underscores the pivotal role of microbiomes in SFF in shaping quality attributes and preserving the cultural heritage of their origin. In contrast to starter driven fermentations that tend to be more controlled but lacking the capacity to maintain or reproduce the complex flavors and intricacies found in SFF. SMCs, therefore, become indispensable tools, providing a nuanced understanding and control over fermented food microbiomes. They empower the prediction and engineering of microbial interactions and metabolic pathways with the aim of optimizing outcomes in food processing. Summarizing the current application of SMCs in fermented foods, there is still space for improvement. Challenges in achieving stability and reproducibility in SMCs are identified, stemming from non-standardized approaches. The future direction should involve embracing standardized protocols, advanced monitoring tools, and synthetic biology applications. A holistic, multi-disciplinary approach is paramount to unleashing the full potential of SMCs and fostering sustainable and innovative applications in fermented food systems.
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Affiliation(s)
- Olga Nikoloudaki
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, 39100 Bolzano, Italy.
| | - Francis Aheto
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, 39100 Bolzano, Italy
| | - Raffaella Di Cagno
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, 39100 Bolzano, Italy
| | - Marco Gobbetti
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, 39100 Bolzano, Italy
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3
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Palatzidi A, Nikoloudaki O, Torreiro MG, Matteucci C, Ferrentino G, Scampicchio MM, Di Cagno R, Gobbetti M. Novel formulations for developing fresh hybrid cheese analogues utilizing fungal-fermented brewery side-stream flours. Curr Res Food Sci 2024; 9:100829. [PMID: 39286429 PMCID: PMC11404057 DOI: 10.1016/j.crfs.2024.100829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2024] [Revised: 08/06/2024] [Accepted: 08/23/2024] [Indexed: 09/19/2024] Open
Abstract
This study investigated the development of hybrid cheese analogues (HCA) made with fermented brewery side-stream ingredients (spent yeast and malt rootlets) and dairy milk. Different percentages of side-stream flours (3.5%, 5%, and 7.5%) were mixed with pasteurized milk, and the developed HCA were evaluated for their biochemical and textural properties. The addition of a fermentation step improved nutrient availability and led to pH (range 4.79-5.60) and moisture content (range 45.86%-61.29%) similar to traditional animal-based fresh cheeses (control). The inclusion of side-stream flours led to coagulation, even without rennet addition. The higher the concentration of the flour used, the faster the coagulation time, suggesting synergistic effect between the enzymes of the rennet and the enzymes present in the fermented side-stream flours. Nevertheless, textural properties were inferior compared to the control. Selected HCA formulations with added 3.5% flour exhibited increased counts of enterococci and enterobacteria cell densities, ranging from 7.28 ± 0.03 to 7.72 ± 0.09 log CFU/g and 4.90 ± 0.16 to 5.41 ± 0.01 log CFU/g, respectively. Compared to the control sample, HCA formulations exhibited higher concentrations of organic acids, peptides, and free amino acids (FAAs). Lactic acid reached up to 23.78 ± 0.94 g/kg of dry matter (DM), while the peptide area reached up to 22918.50 ± 2370.93 mL⋅AU. Additionally, the total concentration of individual FAAs reached up to 2809.74 ± 104.85 mg/kg of DM, contrasted with the control, which resulted in lower concentrations (847.65 ± 0.02 mg/kg of DM). The overall findings suggested that despite challenges in microbiological quality and textural properties, HCA produced with the inclusion of up to 3.5% brewery side-stream flours could be a sustainable solution to produce nutritious dairy alternatives.
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Affiliation(s)
- Anastasia Palatzidi
- Free University of Bozen-Bolzano, Faculty of Agricultural, Environmental and Food Sciences, Piazza Universit'a 1, 39100, Bolzano, BZ, Italy
| | - Olga Nikoloudaki
- Free University of Bozen-Bolzano, Faculty of Agricultural, Environmental and Food Sciences, Piazza Universit'a 1, 39100, Bolzano, BZ, Italy
- International Competence Centre for Food Fermentations-ICOFF, Noitech Park, Via Ipazia 2, 39100, Bolzano, BZ, Italy
| | | | | | - Giovanna Ferrentino
- Free University of Bozen-Bolzano, Faculty of Agricultural, Environmental and Food Sciences, Piazza Universit'a 1, 39100, Bolzano, BZ, Italy
| | - Matteo Mario Scampicchio
- Free University of Bozen-Bolzano, Faculty of Agricultural, Environmental and Food Sciences, Piazza Universit'a 1, 39100, Bolzano, BZ, Italy
| | - Raffaella Di Cagno
- Free University of Bozen-Bolzano, Faculty of Agricultural, Environmental and Food Sciences, Piazza Universit'a 1, 39100, Bolzano, BZ, Italy
- International Competence Centre for Food Fermentations-ICOFF, Noitech Park, Via Ipazia 2, 39100, Bolzano, BZ, Italy
| | - Marco Gobbetti
- Free University of Bozen-Bolzano, Faculty of Agricultural, Environmental and Food Sciences, Piazza Universit'a 1, 39100, Bolzano, BZ, Italy
- International Competence Centre for Food Fermentations-ICOFF, Noitech Park, Via Ipazia 2, 39100, Bolzano, BZ, Italy
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Tonini S, Tlais AZA, Filannino P, Di Cagno R, Gobbetti M. Apple Blossom Agricultural Residues as a Sustainable Source of Bioactive Peptides through Microbial Fermentation Bioprocessing. Antioxidants (Basel) 2024; 13:837. [PMID: 39061905 PMCID: PMC11273824 DOI: 10.3390/antiox13070837] [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: 05/23/2024] [Revised: 07/08/2024] [Accepted: 07/11/2024] [Indexed: 07/28/2024] Open
Abstract
This study explored the impact of starter-assisted fermentation on apple blossoms to enhance their potential as a source of antioxidant and antifungal molecules. Fructobacillus fructosus PL22 and Wickerhamomyces anomalus GY1 were chosen as starters owing to their origin and promising ability to modify plant secondary metabolites. An initial assessment through microbiological and physicochemical analyses showed superior outcomes for starter-assisted fermentation compared to the spontaneous process. Enzymatic hydrolysis of proteins, primarily controlled by starters, orchestrated the generation of new low-molecular-weight peptides. W. anomalus GY1 also induced modifications in the phenolic profile, generating a diverse array of bioactive metabolites. These metabolic changes, particularly the release of potentially bioactive peptides, were associated with significant antioxidant activity and marked antifungal efficacy against three common mold species. Our results shed light on the potential of microbial starters to valorize agricultural wastes and convert them into a valuable resource for industry.
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Affiliation(s)
- Stefano Tonini
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano-Bozen, 39100 Bolzano, Italy; (S.T.); (R.D.C.); (M.G.)
| | - Ali Zein Alabiden Tlais
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano-Bozen, 39100 Bolzano, Italy; (S.T.); (R.D.C.); (M.G.)
| | - Pasquale Filannino
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, 70121 Bari, Italy;
| | - Raffaella Di Cagno
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano-Bozen, 39100 Bolzano, Italy; (S.T.); (R.D.C.); (M.G.)
- International Center on Food Fermentation, 39100 Bolzano, Italy
| | - Marco Gobbetti
- Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano-Bozen, 39100 Bolzano, Italy; (S.T.); (R.D.C.); (M.G.)
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Tonini S, Tlais AZA, Galli BD, Helal A, Tagliazucchi D, Filannino P, Zannini E, Gobbetti M, Di Cagno R. Lentils protein isolate as a fermenting substrate for the production of bioactive peptides by lactic acid bacteria and neglected yeast species. Microb Biotechnol 2024; 17:e14387. [PMID: 38263855 PMCID: PMC10832563 DOI: 10.1111/1751-7915.14387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 11/23/2023] [Accepted: 12/01/2023] [Indexed: 01/25/2024] Open
Abstract
In the current trend where plant-based foods are preferred over animal-based foods, pulses represent an alternative source of protein but also of bioactive peptides (BPs). We investigated the pattern of protein hydrolysis during fermentation of red lentils protein isolate (RLPI) with various lactic acid bacteria and yeast strains. Hanseniaspora uvarum SY1 and Fructilactobacillus sanfranciscensis E10 were the most proteolytic microorganisms. H. uvarum SY1 led to the highest antiradical, angiotensin-converting enzyme-inhibitory and antifungal activities, as found in low molecular weight water soluble extracts (LMW-WSE). The 2039 peptide sequences identified by LMW-WSE were screened using BIOPEP UWM database, and 36 sequences matched with known BPs. Fermentation of RLPI by lactic acid bacteria and yeasts generated 12 peptides undetected in raw RLPI. Besides, H. uvarum SY1 led to the highest abundance (peak areas) of BPs, in particular with antioxidant and ACE-inhibitory activities. The amino acid sequences LVR and LVL, identified in the fermented RLPI, represent novel findings, as they were detected for the first time in substrates subjected to microbial fermentation. KVI, another BP highly characteristic of RLPI-SY1, was previously observed only in dried bonito. 44 novel potential BPs, worthy of further characterization, were correlated with antifungal activity.
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Affiliation(s)
- Stefano Tonini
- Faculty of Agricultural, Environmental and Food SciencesFree University of Bolzano‐BozenBolzanoItaly
| | - Ali Zein Alabiden Tlais
- Faculty of Agricultural, Environmental and Food SciencesFree University of Bolzano‐BozenBolzanoItaly
| | - Bruno Domingues Galli
- Faculty of Agricultural, Environmental and Food SciencesFree University of Bolzano‐BozenBolzanoItaly
| | - Ahmed Helal
- Department of Food and Dairy Sciences and TechnologyDamanhur UniversityDamanhourEgypt
- Department of Life SciencesUniversity of Modena and Reggio EmiliaReggio EmiliaItaly
| | - Davide Tagliazucchi
- Department of Life SciencesUniversity of Modena and Reggio EmiliaReggio EmiliaItaly
| | - Pasquale Filannino
- Department of Soil, Plant and Food ScienceUniversity of Bari Aldo MoroBariItaly
| | - Emanuele Zannini
- Department of Environmental BiologyUniversity of Rome SapienzaRomaItaly
- School of Food and Nutritional ScienceUniversity College CorkCorkIreland
| | - Marco Gobbetti
- Faculty of Agricultural, Environmental and Food SciencesFree University of Bolzano‐BozenBolzanoItaly
| | - Raffaella Di Cagno
- Faculty of Agricultural, Environmental and Food SciencesFree University of Bolzano‐BozenBolzanoItaly
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Fiorino GM, Tlais AZA, Losito I, Filannino P, Gobbetti M, Di Cagno R. Triacylglycerols hydrolysis and hydroxy- and epoxy-fatty acids release during lactic fermentation of plant matrices: An extensive study showing inter- and intra-species capabilities of lactic acid bacteria. Food Chem 2023; 412:135552. [PMID: 36716627 DOI: 10.1016/j.foodchem.2023.135552] [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: 10/07/2022] [Revised: 01/16/2023] [Accepted: 01/21/2023] [Indexed: 01/24/2023]
Abstract
This study aims to show that lactic fermentation by selected starters can enrich plant matrices with hydroxy- and oxo-fatty acids. The behavior of 31 lactic acid bacteria strains was investigated during the fermentation of Persian walnut, which was selected as a model growth substrate due to its inherent lipids content. The content of the following free fatty acids increased in the majority of the fermented walnut samples: linoleic, α-linolenic, palmitic, and oleic acids. The increase of diacylglycerols and, especially, monoacylglycerols levels in fermented walnuts confirmed that strain-specific bacterial lipolytic activities hydrolyzed triacylglycerols during walnut fermentation. Twelve hydroxylated or epoxidized derivatives arising from oleic, linoleic, and linolenic fatty acids, in five groups of isomeric compounds, were also identified. In addition to the better-known lactobacilli, certain strains of Weissella cibaria, Leuconostoc mesenteroides, and Enterococcus faecalis emerged for their lipolytic activities and ability to release hydroxy- and epoxy-fatty acids during walnut fermentation.
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Affiliation(s)
| | | | - Ilario Losito
- Department of Chemistry and SMART Inter-department Research Center, University of Bari Aldo Moro, 70126 Bari, Italy
| | - Pasquale Filannino
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, 70126 Bari, Italy.
| | - Marco Gobbetti
- Faculty of Sciences and Technology, Libera Università di Bolzano, 39100 Bolzano, Italy
| | - Raffaella Di Cagno
- Faculty of Sciences and Technology, Libera Università di Bolzano, 39100 Bolzano, Italy
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Tlais AZA, Trossolo E, Tonini S, Filannino P, Gobbetti M, Di Cagno R. Fermented Whey Ewe's Milk-Based Fruit Smoothies: Bio-Recycling and Enrichment of Phenolic Compounds and Improvement of Protein Digestibility and Antioxidant Activity. Antioxidants (Basel) 2023; 12:antiox12051091. [PMID: 37237957 DOI: 10.3390/antiox12051091] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 05/01/2023] [Accepted: 05/10/2023] [Indexed: 05/28/2023] Open
Abstract
This study aimed to recycle whey milk by-products (protein source) in fruit smoothies (phenolic compounds source) through started-assisted fermentation and delivering sustainable and healthy food formulations capable of providing nutrients that are unavailable due to an unbalanced diet or incorrect eating habits. Five lactic acid bacteria strains were selected as best starters for smoothie production based on the complementarity of pro-technological (kinetics of growth and acidification) traits, exopolysaccharides and phenolics release, and antioxidant activity enhancement. Compared to raw whey milk-based fruit smoothies (Raw_WFS), fermentation led to distinct profiles of sugars (glucose, fructose, mannitol, and sucrose), organic acids (lactic acid and acetic acid), ascorbic acid, phenolic compounds (gallic acid, 3-hydroxybenzoic acid, chlorogenic acid, hydrocaffeic acid, quercetin, epicatechin, procyanidin B2, and ellagic acid) and especially anthocyanins (cyanidin, delphinidin, malvidin, peonidin, petunidin 3-glucoside). Protein and phenolics interaction enhanced the release of anthocyanins, notably under the action of Lactiplantibacillus plantarum. The same bacterial strains outperformed other species in terms of protein digestibility and quality. With variations among starters culture, bio-converted metabolites were most likely responsible for the increase antioxidant scavenging capacity (DPPH, ABTS, and lipid peroxidation) and the modifications in organoleptic properties (aroma and flavor).
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Affiliation(s)
| | - Elisabetta Trossolo
- Faculty of Science and Technology, Free University of Bolzano, 39100 Bolzano, Italy
| | - Stefano Tonini
- Faculty of Science and Technology, Free University of Bolzano, 39100 Bolzano, Italy
| | - Pasquale Filannino
- Department of Soil, Plant and Food Science, University of Bari Aldo Moro, 70121 Bari, Italy
| | - Marco Gobbetti
- Faculty of Science and Technology, Free University of Bolzano, 39100 Bolzano, Italy
| | - Raffaella Di Cagno
- Faculty of Science and Technology, Free University of Bolzano, 39100 Bolzano, Italy
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Shori AB, Al-sulbi OS. Antioxidant activity of labneh made from cashew milk and its combination with cow or camel milk using different starter cultures. JOURNAL OF FOOD SCIENCE AND TECHNOLOGY 2023; 60:701-709. [PMID: 36712222 PMCID: PMC9873892 DOI: 10.1007/s13197-022-05655-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 09/16/2022] [Accepted: 11/01/2022] [Indexed: 12/13/2022]
Abstract
The aim of this study is to investigate the effects of three strains of probiotic Lactobacillus spp. i.e. L. plantarum (S1) L. casei (S2), and/or L. rhamnosus (S3) in co-cultures with Streptococcus thermophiles (St) and L. delbrueckii subsp. lactis (Ll) on the changes of total phenolic and flavonoid contents, and antioxidant activity of concentrated yogurt (labneh; L) made from individual cashew milk (EwM; 100:0 v/v) mixed with/without cow (Co) or camel (Ca) milk (75:25 v/v) during 0, 7, 14, and 21 days of storage. EwML100% S3 showed the highest total phenolic and flavonoid contents during 21 days of storage. Radical scavenging activity was improved in Ew-/Ca-ML (S2, S3, and S4) compared to control (containing St and Ll) on the 0th day. The maximum ferric reducing potential was observed in fresh Ew-/Ca-ML75% S1 (1.6 ± 0.05 mM Fe + 2 E/mL). All the starter cultures enhanced (p < 0.05) the chelating ability of EwML compared to control during the 7th and 14th day of storage. In conclusion, cashew milk labneh mixed with/without cow or camel milk containing probiotic Lactobacillus spp. can strengthen the health-promoting properties with antioxidant activity.
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Affiliation(s)
- Amal Bakr Shori
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, 21589 Saudi Arabia
| | - Ohoud Shami Al-sulbi
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, 21589 Saudi Arabia
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Fu Z, Sun L, Hou M, Hao J, Lu Q, Liu T, Ren X, Jia Y, Wang Z, Ge G. Effects of different harvest frequencies on microbial community and metabolomic properties of annual ryegrass silage. Front Microbiol 2022; 13:971449. [PMID: 36110305 PMCID: PMC9468666 DOI: 10.3389/fmicb.2022.971449] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 08/01/2022] [Indexed: 11/27/2022] Open
Abstract
In this study, we analyzed the fermentation quality, microbial community, and metabolome characteristics of ryegrass silage from different harvests (first harvest-AK, second harvest-BK, and third harvest-CK) and analyzed the correlation between fermentative bacteria and metabolites. The bacterial community and metabolomic characteristics were analyzed by single-molecule real-time (SMRT) sequencing and ultra-high-performance liquid chromatography-mass spectrometry (UHPLC-MS/MS), respectively. After 60 days of ensiling, the pH of BK was significantly lower than those of AK and CK, and its lactic acid content was significantly higher than those of AK and CK. Lactiplantibacillus and Enterococcus genera dominate the microbiota of silage obtained from ryegrass harvested at three different harvests. In addition, the BK group had the highest abundance of Lactiplantibacillus plantarum (58.66%), and the CK group had the highest abundance of Enterococcus faecalis (42.88%). The most annotated metabolites among the differential metabolites of different harvests were peptides, and eight amino acids were dominant in the composition of the identified peptides. In the ryegrass silage, arginine, alanine, aspartate, and glutamate biosynthesis had the highest enrichment ratio in the metabolic pathway of KEGG pathway enrichment analysis. Valyl-isoleucine and glutamylvaline were positively correlated with Lactiplantibacillus plantarum. D-Pipecolic acid and L-glutamic acid were positively correlated with Levilactobacillus brevis. L-phenylalanyl-L-proline, 3,4,5-trihydroxy-6-(2-methoxybenzoyloxy) oxane-2-carboxylic acid, and shikimic acid were negatively correlated with Levilactobacillus brevis. In conclusion, this study explains the effects of different harvest frequencies on the fermentation quality, microbial community, and metabolites of ryegrass, and improves our understanding of the ensiling mechanisms associated with different ryegrass harvesting frequencies.
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Affiliation(s)
- Zhihui Fu
- Laboratory of Forage Cultivation, Processing and High Efficient Utilization of Ministry of Agriculture, College of Grassland, Resources and Environment, Hohhot, China
- Key Laboratory of Grassland Resources, Ministry of Education, Inner Mongolia Agricultural University, Hohhot, China
| | - Lin Sun
- Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot, China
| | - Meiling Hou
- College of Life Sciences, Baicheng Normal University, Baicheng, China
| | - Junfeng Hao
- Laboratory of Forage Cultivation, Processing and High Efficient Utilization of Ministry of Agriculture, College of Grassland, Resources and Environment, Hohhot, China
- Key Laboratory of Grassland Resources, Ministry of Education, Inner Mongolia Agricultural University, Hohhot, China
| | - Qiang Lu
- College of Agriculture, Ningxia University, Yinchuan, China
| | - Tingyu Liu
- College of Agriculture, Inner Mongolia Minzu University, Tongliao, China
| | - Xiuzhen Ren
- College of Agriculture, Inner Mongolia Minzu University, Tongliao, China
| | - Yushan Jia
- Laboratory of Forage Cultivation, Processing and High Efficient Utilization of Ministry of Agriculture, College of Grassland, Resources and Environment, Hohhot, China
- Key Laboratory of Grassland Resources, Ministry of Education, Inner Mongolia Agricultural University, Hohhot, China
| | - ZhiJun Wang
- Laboratory of Forage Cultivation, Processing and High Efficient Utilization of Ministry of Agriculture, College of Grassland, Resources and Environment, Hohhot, China
- Key Laboratory of Grassland Resources, Ministry of Education, Inner Mongolia Agricultural University, Hohhot, China
| | - Gentu Ge
- Laboratory of Forage Cultivation, Processing and High Efficient Utilization of Ministry of Agriculture, College of Grassland, Resources and Environment, Hohhot, China
- Key Laboratory of Grassland Resources, Ministry of Education, Inner Mongolia Agricultural University, Hohhot, China
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