Phenotypic Assessment of Probiotic and Bacteriocinogenic Efficacy of Indigenous LAB Strains from Human Breast Milk

Breast milk is the combination of bioactive compounds and microflora that promote newborn’s proper growth, gut flora, and immunity. Thus, it is always considered the perfect food for newborns. Amongst their bioactives, probiotic communities—especially lactic acid bacteria (LAB)—are characterized from breast milk over the first month of parturition. In this study, seven LAB were characterized phenotypically and genotypically as Levilactobacillus brevis BDUMBT08 ({"type":"entrez-nucleotide","attrs":{"text":"MT673657","term_id":"1863149999"}}MT673657), L. gastricus BDUMBT09 ({"type":"entrez-nucleotide","attrs":{"text":"MT774596","term_id":"1873222494"}}MT774596), L. paracasei BDUMBT10 ({"type":"entrez-nucleotide","attrs":{"text":"MT775430","term_id":"1874262304"}}MT775430), L. brevis BDUMBT11 ({"type":"entrez-nucleotide","attrs":{"text":"MW785062","term_id":"2009762994"}}MW785062), L. casei BDUMBT12 ({"type":"entrez-nucleotide","attrs":{"text":"MW785063","term_id":"2009820773"}}MW785063), L. casei BDUMBT13 ({"type":"entrez-nucleotide","attrs":{"text":"MW785178","term_id":"2010296340"}}MW785178), and Brevibacillus brevis M2403 ({"type":"entrez-nucleotide","attrs":{"text":"MK371781","term_id":"1548854744"}}MK371781) from human breast milk. Their tolerance to lysozyme, acid, bile, gastric juice, pancreatic juice, and NaCl and potential for mucoadhesion, auto-aggregation, and co-aggregation with pathogens are of great prominence in forecasting their gut colonizing ability. They proved their safety aspects as they were negative for virulence determinants such as hemolysis and biofilm production. Antibiogram of LAB showed their sensitivity to more than 90% of the antibiotics tested. Amongst seven LAB, three isolates (L. brevis BDUMBT08 and BDUMBT11, and L. gatricus BDUMBT09) proved their bacteriocin producing propensity. Although the seven LAB isolates differed in their behavior, their substantial probiotic properties with safety could be taken as promising probiotics for further studies to prove their in vivo effects, such as health benefits, in humans.     

Phyto-chemical and biological activity of Myristica fragrans,an ayurvedic medicinal plant in Southern India and its ingredient analysis

The major aspects of using plant-derived medications are significantly safer and secure than synthetic ones. The n-hexane seed extract of ayurvedic medicinal plants Myristica fragrans was also utilized as food ingredients have analyzed for phytochemical existence by Gas Chromatography-mass spectrometry (GC–MS). Twenty-three phytoconstituents were identified with elemicin (24.44%) as the major constituent. Lipid peroxidase, catalase and DPPH assays were performed using the isolated elemicin and the results revealed significant antioxidant activity. The antibacterial study revealed that elemicin showed MIC of 31.25 μg/mL against Escherichia coli, Pseudomonas aeruginosa, and Salmonella typhi, and 62.5 μg/mL against Klebsiella pneumonia and Staphylococcus aureus. Elemicin exhibited better antifungal activity against Candida tropicalis and Aspergillus flavus than Aspergillus niger, Penicillium chrysogenum and Trichophyton rubrum. The study implies that the elemicin isolated from Myristica fragrans possess promising bioactive properties and can be crucially utilized in the development of therapeutic agents and food preservatives.