Antimicrobial activity of peptides derived from enzymatic hydrolysis of goat milk caseins

In this study, peptide fragments were produced from goat milk casein by proteolytic enzymes trypsin and ficin and combination of both enzymes, and their antimicrobial activity was investigated. After enzymatic treatments, antimicrobial activity against both Gram-positive and Gram-negative bacteria was enhanced. The hydrolysates were passed through ultrafiltration. The obtained hydrolysate by ficin (molecular weight (MW)
Source: Comparative Clinical Pathology - Category: Pathology Source Type: research

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SYTO 9 is a fluorescent nucleic acid stain that is widely used in microbiology, particularly for fluorescence microscopy and flow cytometry analyzes. Fluorimetry-based analysis, i.e., analysis of fluorescence intensity from a bulk sample measurement, is more cost effective, rapid and accessible than microscopy or flow cytometry but requires application-specific calibration. Here we show the relevance of SYTO 9 for food safety analysis. We stained four bacterial species of relevance to food safety (Bacillus cereus, Escherichia coli, Salmonella enterica subspecies enterica ser. Typhimurium, Staphylococcus aureus) with differ...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
AbstractNanoemulsion technology is an alternative candidate to overcome antibiotic resistance in pathogenic bacteria. The aim of this research was nanoemulsion production from the essential oil ofAlhagi maurorum and the characterization of this nanostructure. Nanoemulsion of essential oil fromA. maurorum was prepared using the ionotropic gelation method and chitosan as a nano-carrier. Scanning Electron Microscopy (SEM) was used to characterize the synthesized nanoparticles. The effect of nanoemulsion on the antibacterial, antibiofilm, and plasmid curing of six antibiotic-resistant pathogenic bacteria (P. aeruginosa, E. col...
Source: Journal of Environmental Health Science and Engineering - Category: Environmental Health Source Type: research
Abstract Natural products from plants are pulling in more interest in exploration due to their therapeutic properties like, mainly because of the drug-resistance in microbes against synthetic drugs. Thus, the present study was designed to assess the antimicrobial and antioxidant actions of some Agro-waste (garlic, ginger, onion, potato) peel extracts. Ginger peel extracts exhibited the highest FRAP (0.273±0.044 mm Fe2+ Eq/g dry weight) while garlic peel extracts exhibited the highest TAC (0.47±0.0452 mm AAE/g dry weight) values among all selections. The antimicrobial activity of the peels was evaluat...
Source: An Acad Bras Cienc - Category: Science Authors: Tags: An Acad Bras Cienc Source Type: research
A series of 2-amino-1,4-naphthoquinone derivatives (NQA-NQF) was synthesized by alternative methods (ultrasonication and microwave irradiation), with yields ranging from 40 to 71%, and without the need of further recrystallization. Each compound was evaluated against four Gram-positive (Bacillus subtilis, Enterococcus faecalis, Staphylococcus aureus and Bacillus cereus) and five Gram-negative (Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Acinetobacter baumannii and Klebsiella pneumoniae positive β -lactamase) bacteria strains. The NQF was the most active amino-naphthoquinone derivative with minimum...
Source: Journal of the Brazilian Chemical Society - Category: Chemistry Source Type: research
dra Combrinck Terminalia sericea Burch. ex. DC. (Combretaceae) is a popular remedy for the treatment of infectious diseases. It is widely prescribed by traditional healers and sold at informal markets and may be a good candidate for commercialisation. For this to be realised, a thorough phytochemical and bioactivity profile is required to identify constituents that may be associated with the antibacterial activity and hence the quality of raw materials and consumer products. The aim of this study was to explore the phytochemistry and identify the antibacterial constituents of T. sericea root bark, using a metabolomic a...
Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
Abstract Three new neoflavonoids, named (1S,8R,9S)-1,5-dihydroxy-4,12-dimethoxy-8-vinyl-tricyclo[7.3.1.02,7]trideca-2,4,6,11-tetraen-10-one (1), 2,5,2',5'-tetrahydroxy-4-methoxybenzophenone (2) and 2,5,3'-trihydroxy-4-methoxybenzophenone (3), were isolated from the heartwood of Dalbergia melanoxylon. Their structures were established by spectroscopic methods, including UV, IR, HRMS, 1 D and 2 D-NMR. Compounds 1-3 were evaluated for inhibitory activity against three fungal strains Candida albicans, Mucor ramosissimus, Saccharomycopsis fermentans and seven bacterial strains Shigella dysenteriae, Salmon...
Source: Natural Product Research - Category: Biochemistry Authors: Tags: Nat Prod Res Source Type: research
Antimicrobial Activity of Cultivable Endophytic and Rhizosphere Fungi Associated with "Mile-a-Minute," Mikania cordata (Asteraceae). Biomed Res Int. 2020;2020:5292571 Authors: Jayatilake PL, Munasinghe H Abstract Endophytic and rhizosphere fungi are understood to be aiding the host plant to overcome a range of biotic and abiotic stresses (nutrition depletion, droughts, etc.) hence, they remain to be reservoirs of plethora of natural products with immense use. Consequently, this investigation of endophytic and rhizosphere fungi isolated from Mikania cordata (a perennial vine that is well esta...
Source: Biomed Res - Category: Research Authors: Tags: Biomed Res Int Source Type: research
Authors: Balali GI, Yar DD, Afua Dela VG, Adjei-Kusi P Abstract Microbes are found all over the globe with some few exceptions, including sterilized surfaces. They include normal flora that is nonpathogenic, which contribute to the larger percentage, and pathogenic species which are few. Hence, the activities of humans cannot be completely separated from microbes. Thus, many pathogenic microbes have found their way into fresh fruits and vegetables which are a great source of a healthy diet for humans. The growing demand for fresh fruits and vegetables has necessitated larger production. The larger production of veg...
Source: International Journal of Microbiology - Category: Microbiology Tags: Int J Microbiol Source Type: research
Conclusion: The findings of this research showed that, bioactive compound of Streptomyces sp. strain UICC B-92 is suggested a new compound based on glycoside structure and its position. PMID: 32494347 [PubMed]
Source: Iranian Journal of Microbiology - Category: Microbiology Tags: Iran J Microbiol Source Type: research
Abstract The aim is to evaluate the prooxidant and antimicrobial effects of Fe3O4 and TiO2 nanoparticles and thalicarpine by luminescent and standard microbiological assays. Their effect on the kinetics of free-radical oxidation reactions (at pH 7.4 and pH 8.5) is studied in the following model systems, using activated chemiluminescence: chemical, with Fenton's reagent (H2O2-FeSO4)-for the generation of hydroxyl radicals (.OH); chemical, with oxidant hydrogen peroxide (H2O2); chemical (NAD.H-PhMS), for the generation of superoxide radicals (O2.-). Fe3O4 nanoparticles exhibit highly pronounced antioxidant propertie...
Source: Archives of Microbiology - Category: Microbiology Authors: Tags: Arch Microbiol Source Type: research
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