Category Archives: Probiotic

Research – Evaluation of the safety of microorganisms (“probiotics”) used in food supplements

ACSA

The Food Safety Authority of Ireland (FSAI) Scientific Committee has published a scientific report on the safety assessment of micro-organisms (“probiotics”) used in food supplements which aims to help companies assess the safety of “probiotics” , in the absence of specific legal criteria.

“Probiotics” are defined by FAO/WHO* as “live micro-organisms which when administered in adequate amounts confer a health benefit on the host”. The term “probiotic”, however, is currently an unauthorized health claim under EU law. Applications for health claims on “probiotics” have been submitted for evaluation to the European Food Safety Authority (EFSA) and so far, no application has received a positive opinion and subsequent authorization. Although the term is not permitted on food product or dietary supplement labels, the term is used in this scientific report because it is widely used by industry and the scientific community.

The Committee found that reported adverse events associated with “probiotics” are few and tend to be ad hoc reports of infections, including bacteremia, sepsis, or endocarditis in people with belonging to different risk groups. 

The report makes recommendations on the criteria for safety assessment and the evidence that a producer of food supplements should use to demonstrate the micro-organism safety of their products.

FSAI

Research – Researchers explore probiotics to control Campylobacter

Feedstuffs

On-farm control measures are required to mitigate the risk of the bacteria being transmitted to humans working with poultry and people who visit poultry farms. Abdelaziz’s lab is studying the impact of inoculating eggs (in-ovo) with probiotics on gut health and immune system development of broilers before they hatch.

Probiotics are live bacteria, fungi, or yeasts that help poultry maintain healthy digestive systems. They are increasingly being included in poultry diets as alternatives to antibiotics. Abdelaziz and his team believe in-ovo technology can be used to deliver probiotics to chicken embryos and help boost chicks’ immune systems before they hatch.

During their investigation, Abdelaziz and his team have found certain probiotics (lactobacilli) applied in-ovo to chick embryos increased immune-related genes in the chicks’ guts which could promote healthy immune systems of chick embryos. Future studies will investigate whether Lactobacillus-induced immune responses protect against harmful microorganisms after chicks hatch.

Research – Antagonistic Effects of Conjugated Linoleic Acids of Lactobacillus casei Against Foodborne Enterohemorrhagic Escherichia coli 

Journal of Food Protection

Probiotics in fermented foods or commercially available supplements benefit the host by providing metabolites/peptides. The production of these metabolites varies with available substrates/prebiotic present in the system and their concentration. In this study, 0.5% peanut flour (PF) was used to stimulate the growth and production of metabolites of wild-type Lactobacillus casei (LC wt ) and compare with an engineered L. casei (LC CLA ) capable of converting a higher amount of conjugated linoleic acid (CLA). The total extracellular metabolites present in the cell-free cultural supernatant (CFCS) of LC wt (without peanut), LC wt+PF (with peanut), and LC CLA were collected after 24 h and 48 h of incubation, and their antagonistic activities against enterohemorrhagic Escherichia coli (EHEC EDL933) growth and pathogenesis were evaluated. All the collected metabolites exhibited varying efficiency in restraining EDL933 growth while supplementing low concentration of CLA to the 48-h CFCS from LC wt showed augmented antagonism toward EDL933. A downregulation of key virulence genes was observed from metabolites collected at 48-h time point. These observations indicate that the presence of metabolites in CFCSs including CLA, produced by Lactobacillus , which was further identified by gas chromatography-mass spectrometry; plays a critical role. This study demonstrates the potential applicability of Lactobacillus -originated CLA in the prevention of EDL933 mediated illnesses.

Research – Antifungal Preservation of Food by Lactic Acid Bacteria

MDPI

Aflatoxin

Image CDC

Fungal growth and consequent mycotoxin release in food and feed threatens human health, which might even, in acute cases, lead to death. Control and prevention of foodborne poisoning is a major task of public health that will be faced in the 21st century. Nowadays, consumers increasingly demand healthier and more natural food with minimal use of chemical preservatives, whose negative effects on human health are well known. Biopreservation is among the safest and most reliable methods for inhibiting fungi in food. Lactic acid bacteria (LAB) are of great interest as biological additives in food owing to their Generally Recognized as Safe (GRAS) classification and probiotic properties. LAB produce bioactive compounds such as reuterin, cyclic peptides, fatty acids, etc., with antifungal properties. This review highlights the great potential of LAB as biopreservatives by summarizing various reported antifungal activities/metabolites of LAB against fungal growth into foods. In the end, it provides profound insight into the possibilities and different factors to be considered in the application of LAB in different foods as well as enhancing their efficiency in biodetoxification and biopreservative activities. View Full-Text