Open research questions in Probiotics and Fermented Foods
1,284 gap statements mined from Probiotics and Fermented Foods papers in our 7.9M-paper local library, which holds 4,951 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.
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What the literature leaves open
The need for comprehensive safety assessment of potential probiotic strains. The lack of information on the safety profile of Pediococcus acidilactici SY23. The importance of evaluating the strain's enzymatic profile and antibiotic resistance genes.
Comprehensive safety assessment of Pediococcus acidilactici SY23 for potential probiotic use in inflammation management · 2026 · DOIIt also highlights the need for efficient strain screening methods for precision fermentation.
Engineering sweetness: zeocin-based strain screening to identify high-titer Komagataella phaffii clones for brazzein precision fermentation · 2026 · DOIOne challenge is the heterogeneity of the literature on probiotics and their effects on the gut-derived incretin peptide axis. Another challenge is the need for further research on the mechanisms by which probiotics promote GLP-1 secretion and improve glycemic control. A third challenge is the development of engineered probiotics that can effectively treat type 2 diabetes.
Probiotics as modulators of the gut-derived incretin peptide axis in type 2 diabetes: GLP-1, GLP-2, and microbial metabolite signaling · 2026 · DOIThe requirement for a minimum of 1 billion colony-forming units for efficacy is an assumption that needs to be challenged. The necessity for gut colonization is another assumption that requires further investigation. The inherent superiority of live over heat-treated preparations is also a gap that needs to be addressed.
Beyond the billion: dose-response immunophenotyping and machine learning classification of live vs. heat-treated gram-positive probiotic strains in human peripheral blood mononuclear cells—a single-donor proof-of-concept study · 2026 · DOIThe need for a clear operational guideline for the storage of sourdough starters under refrigerated conditions. The lack of understanding of the effect of sourdough starter storage on the quality of the resulting bread.
The Effect of Storage Conditions on the Properties of Sourdough Starters, Mature Sourdoughs and Quality of the Bread · 2026 · DOIThere is a need to optimize the development of a lactic acid bacteria inoculum in pumpkin juice for potential applications in fermentation of plant-based matrices. The current study fills this gap by evaluating the effect of different factors on the viability of lactic acid bacteria.
Optimization of the Development of a Lactic Acid Bacteria Inoculum in Pumpkin Juice for Potential Applications in the Fermentation of Plant-Based Matrices · 2026 · DOIFurther studies could investigate the effects of different variables on the viability of microencapsulated Lactobacillus plantarum. Research could focus on scaling up the microencapsulation process for industrial applications. The impact of microencapsulated probiotics on human health could be explored.
Response Surface Methodology-Based Optimization for Enhancing the Viability of Microencapsulated Lactobacillus plantarum in Composite Materials · 2025 · DOILimited understanding of the optimal concentrations of low-acyl gellan gum, bacterial cellulose, and calcium for microencapsulation.
Response Surface Methodology-Based Optimization for Enhancing the Viability of Microencapsulated Lactobacillus plantarum in Composite Materials · 2025 · DOINeed for cost-effective media formulations and bioprocess optimization. Limited understanding of LAB metabolism and metabolite production.
Comprehensive Review of Strategies for Lactic Acid Bacteria Production and Metabolite Enhancement in Probiotic Cultures: Multifunctional Applications in Functional Foods · 2025 · DOIThe need for a deeper understanding of probiotics, their mode of action, and technological characteristics such as survival. The limitations of current methods for evaluating probiotic characteristics and their health impacts.
Understanding the Functionality of Probiotics on the Edge of Artificial Intelligence (AI) Era · 2025 · DOIThe paper identifies a growing need for research on the microbial diversity of artisanal cow’s milk kefir from various global regions. There is a lack of understanding of the microbial dynamics and how it affects the quality and functional properties of the final product. The study highlights the importance of longitudinal studies for a more comprehensive understanding of kefir fermentation dynamics.
The standardization of artisanal kefir is limited by regulatory requirements in Brazil. There is a need to evaluate the physicochemical properties, volatile compounds, and microbiological stability of artisanal kefir during storage.
The lack of studies on bacteriocin production by Lactiplantibacillus plantarum LD1 in solid-state fermentation using lignocellulosic substrates. The need for optimization of conditions for bacteriocin production. The requirement for a sustainable and economical bioprocess for large-scale production.
Bacteriocin Production by Lactiplantibacillus plantarum LD1 in Solid-State Fermentation Using Lignocellulosic Substrates · 2025 · DOIThe poor yields of EPS from LAB have prevented them from being economically used as food additives. Scientific, technical, and regulatory issues make it hard to use EPS on a larger scale. The extraction and purification of EPS are highly difficult and can damage the EPSs' structure and functionality.
Microbial polysaccharide engineering: the role of LAB-derived EPS in fermented food innovation and nutritional enhancement · 2026 · DOIFurther clinical and regulatory development for personalized T2D therapy, - Investigation of microbiota-targeted interventions for diabetes-related complications, - Exploration of the therapeutic potential of engineered…
Probiotics as modulators of the gut-derived incretin peptide axis in type 2 diabetes: GLP-1, GLP-2, and microbial metabolite signaling · 2026 · DOIInvestigating the reasons why the PBMC co-culture model remains the most translationally valid platform for probiotic immunomodulatory screening, - Exploring the potential of machine learning tools to extract biologically meaningful information from well-structured factorial experimental designs, - Addressing the methodological gaps in the probiotic literature, - Investigating the dose-response relationships across…
Beyond the billion: dose-response immunophenotyping and machine learning classification of live vs. heat-treated gram-positive probiotic strains in human peripheral blood mononuclear cells—a single-donor proof-of-concept study · 2026 · DOIMacrophage models do not reproduce the complexity of the vaginal mucosal environment, - The study used a limited number of vaginal LAB strains, - The study was conducted in a controlled laboratory…
Vaginal Lactic Acid Bacteria Isolated from Healthy Algerian Women Display Distinct Immunomodulatory Profiles Across Macrophage Models · 2026 · DOIFurther studies are needed to evaluate the immunomodulatory effects of vaginal LAB strains in vivo, - The use of more complex cellular models or animal models may provide additional insights, - The potential applications of vaginal LAB strains as probiotics or therapeutic agents should be…
Vaginal Lactic Acid Bacteria Isolated from Healthy Algerian Women Display Distinct Immunomodulatory Profiles Across Macrophage Models · 2026 · DOINo future research directions were suggested, - Further studies could investigate the application of the optimized inoculum in different plant-based matrices, - The effects of other factors on inoculum viability could be…
Optimization of the Development of a Lactic Acid Bacteria Inoculum in Pumpkin Juice for Potential Applications in the Fermentation of Plant-Based Matrices · 2026 · DOIFurther study on the application of CRISPR in enhancing plant-based fermented foods - Investigation of the potential of microbial innovations to address nutritional…
Nutritional Enhancement of Plant-Based Fermented Foods: Microbial Innovations for a Sustainable Future · 2025 · DOISome important challenges and limitations remain - Increasing antibiotic resistance among bacteria has made the treatment of many bacterial infections…
Expanding Layers of Bacteriocin Applications: From Food Preservation to Human Health Interventions · 2025 · DOIMethodological factors—including DNA extraction, sequencing platform, and bioinformatic pipelines—further impact the reported microbial profiles, - Heat treatment reducing natural microbial diversity, - The need for standardization across…
Understanding the complex microbiomes of dairy products, - Harness microbial resources for innovation in dairy biotechnology, - Investigating the influence of biological, technological, environmental, and methodological factors on microbial…
Guiding future research into durability, quality, and consumer perception, - Investigating the role of Enterococcus in kefir aroma, - Studying the negative association of Aspergillus and Meyerozyma with kefir sensory…
The need for novel probiotic strains with potential applications in the fermentation of dairy products, - The challenge of maintaining cell viability over long periods, - The lack of studies on the use of immobilized cells in dairy…
A Novel Wild-Type Lacticaseibacillus paracasei Strain Suitable for the Production of Functional Yoghurt and Ayran Products · 2025 · DOI
Most-cited papers in Probiotics and Fermented Foods
- A taxonomic note on the genus Lactobacillus: Description of 23 novel genera, emended description of the genus Lactobacillus Beijerinck 1901, and union of Lactobacillaceae and Leuconostocaceae · INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY · 2020 · 4,140 citations
- Blautia —a new functional genus with potential probiotic properties? · Gut Microbes · 2021 · 1,314 citations
- Microbial Fermentation and Its Role in Quality Improvement of Fermented Foods · Fermentation · 2020 · 757 citations
- Metabolism Characteristics of Lactic Acid Bacteria and the Expanding Applications in Food Industry · Frontiers in Bioengineering and Biotechnology · 2021 · 698 citations
- Dietary tryptophan metabolite released by intratumoral Lactobacillus reuteri facilitates immune checkpoint inhibitor treatment · Cell · 2023 · 690 citations
- European Journal of Molecular & Clinical Medicine · Zenodo (CERN European Organization for Nuclear Research) · 2020 · 600 citations
- Bifidobacterium species associated with breastfeeding produce aromatic lactic acids in the infant gut · Nature Microbiology · 2021 · 545 citations
- Lactobacillus Sepsis Associated With Probiotic Therapy · PEDIATRICS · 2005 · 489 citations
- Probiotic Supplementation Improves Cognitive Function and Mood with Changes in Gut Microbiota in Community-Dwelling Older Adults: A Randomized, Double-Blind, Placebo-Controlled, Multicenter Trial · The Journals of Gerontology Series A · 2020 · 487 citations
- POST-PASTEURIAN CULTURES: The Microbiopolitics of Raw-Milk Cheese in the United States · Cultural Anthropology · 2008 · 472 citations
Most recent work
- Probiotic Development Strategy Centered on Stability and Regulatory Considerations · Comprehensive Reviews in Food Science and Food Safety · 2026
- Recent Progress in Probiotic Encapsulation: Techniques, Characterization and Food Industry Prospects · Foods · 2026
- Current Concepts in Probiotic Safety and Efficacy · Nutrients · 2026
- Engineered probiotics for inflammatory bowel disease therapy: mechanisms, delivery strategies, and precision medicine · Frontiers in Microbiology · 2026
- Adopting omics-based approaches to facilitate the establishment of microbial consortia to generate reproducible fermented foods with desirable properties · npj Science of Food · 2026
- Postbiotics for improving food quality and safety: From mechanistic insights to industrial applications · LWT · 2026
- Bacteriocins, a New Generation of Sustainable Alternatives to Antibacterial Agents in Primary Food Production Systems · Molecules · 2026
- From Waste to Worth: The Role of Fermentation in a Sustainable Future · Foods · 2026
- The Prebiotic and Techno‐Functional Potential of Microbial Exopolysaccharides for Human Health and Food Systems · Comprehensive Reviews in Food Science and Food Safety · 2026
- Lactic Acid Bacteria as the Green and Safe Food Preservatives: Their Mechanisms, Applications and Prospects · Foods · 2026
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