scholarly journals Combining Celery Oleoresin, Limonene and Rhamnolipid as New Strategy to Control Endospore-Forming Bacillus cereus

Foods ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 455
Author(s):  
Paula de Camargo Bertuso ◽  
Débora M. Drappé Mayer ◽  
Marcia Nitschke
Keyword(s):  
Antimicrobial Activity ◽  
Bacillus Cereus ◽  
Inhibitory Concentration ◽  
Economic Losses ◽  
Foodborne Diseases ◽  
Great Problem ◽  
Log Reduction ◽  
Hydrophobic Compounds ◽  
New Strategy ◽  
Spore Outgrowth

Foodborne diseases (FBD) are a great problem worldwide, leading millions of people to seek medical help and to significant economic losses for industry. Among the agents implicated in FDB is Bacillus cereus, a Gram-positive, toxigenic and endospore-forming bacterium. In this study, rhamnolipid (RL) biosurfactant, celery oleoresin (OR) and limonene (LN) were evaluated as bio-based alternatives for controlling the growth of vegetative cells and endospores of B. cereus. To address their antimicrobial activity, the compounds were tested separately and in combination. Results demonstrate that, when combined with RL, both OR and LN have lower minimal inhibitory concentration (MIC) values and increased endospore inhibition potential. A percentage of endospore inhibition from 73% to 98%, corresponding to a 2.8–3.6 log reduction in spore outgrowth, was observed. RL inhibited B. cereus growth and endospore germination and potentially enhanced the antimicrobial efficacy of the natural hydrophobic compounds tested.

scholarly journals Bacillus cereus group: genetic aspects related to food safety and dairy processing

2018 ◽  
Vol 85 (0) ◽  
Author(s):  
Gabriel Augusto Marques Rossi ◽  
Carlos Eduardo Gamero Aguilar ◽  
Higor Oliveira Silva ◽  
Ana Maria Centola Vidal
Keyword(s):  
Public Health ◽  
Food Safety ◽  
Bacillus Cereus ◽  
Economic Losses ◽  
Foodborne Diseases ◽  
Pathogenic Species ◽  
Bacillus Cereus Group ◽  
Dairy Processing ◽  
Viable Cells ◽  
High Pathogenic

ABSTRACT: Bacillus cereus group includes not pathogenic and high pathogenic species. They are considered as a risk to public health due to foodborne diseases and as an important cause of economic losses to industries due to production of spoilage enzymes. Some researches have been performed in order to assess the possible factors that contribute to put public health into risk because of consumption of food contaminated with viable cells or toxins which have complex mechanisms of production. The control of these bacteria in food is difficult because they are resistant to several processes used in industries. Thus, in this way, this review focused on highlighting the risk due to toxins production by bacteria from B. cereus group in food and the consequences for food safety and dairy industries.

scholarly journals Time-Kill Assay of 4-Hydroxypanduratin A Isolated from Kaempferia Pandurata Against Foodborne Pathogens

Molekul ◽  
2017 ◽  
Vol 12 (2) ◽  
pp. 166
Author(s):  
Soerya Dewi Marliyana ◽  
Didin Mujahidin ◽  
Yana M Syah ◽  
Yaya Rukayadi
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Minimum Inhibitory Concentration ◽  
Bacillus Cereus ◽  
Foodborne Pathogens ◽  
Proteus Mirabilis ◽  
Inhibitory Concentration ◽  
Time Curve ◽  
Time Kill ◽  
Strong Antimicrobial Activity

Time–kill assay was performed for 4-hydroxypanduratin A that was isolated from Kaempferia pandurata rizhome against four important foodborne pathogens, namely Bacillus cereus ATCC 21772, Bacillu subtilis ATCC 6633, Staphylococcus aureus ATCC 29737,  and  Proteus mirabilis ATCC 21100. The methods have been investigated in term of Minimum Inhibitory Concentration (MIC) and killing time curve using methods of Clinical and Laboratory Standards Institute (CLSI) guidelines. The results showed that 4-hydroxypanduratin A rapid acting in killing bacteria as follow: B. cereus : 1×MIC for 4 h, P. mirabilis: 4×MIC for 0.5 h, meanwhile  B. subtilis and S. aureus were 1×MIC for 2 h. In conclusion, 4-hydroxypanduratin A showed strong antimicrobial activity against four important foodborne pathogens.

scholarly journals Antimicrobial activity of essential oil from Psidium cattleianum Afzel. ex Sabine leaves

2020 ◽  
Vol 19 (6) ◽  
pp. 614-627
Author(s):  
Thais Lorana Savoldi ◽  
◽  
Jasmina Glamoćlija ◽  
Marina Soković ◽  
José Eduardo Gonçalves ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Essential Oil ◽  
Food Production ◽  
Inhibitory Concentration ◽  
Trichoderma Viride ◽  
Aspergillus Ochraceus ◽  
Foodborne Diseases ◽  
Aspergillus Versicolor ◽  
Psidium Cattleianum ◽  
And Staphylococcus Aureus

The search for natural sources to control microorganisms is of interest in food production. This study evaluated the chemical composition and antimicrobial activity of the essential oil from Psidium cattleianum leaves. The essential oil was extracted by hydrodistillation, and identified by GC-MS. The predominant class of compounds was sesquiterpenes (47.6%) and the major compounds were trans-β-caryophyllene (14.7%), 1,8-cineole (11.7%) and ɣ-muurolene (5.6%). The antimicrobial activity was carried out by microdillution technique against eight fungi and eight bacteria. The minimum inhibitory concentration ranged from 0.17 to 11.25 mg mL-1 for fungi, and from 1.40 to 16.87 mg mL-1 for bacteria. The highest activities were against fungi Aspergillus fumigatus (ATCC 1022), Aspergillus ochraceus (ATCC 12066), Aspergillus versicolor (ATCC 11730), and Trichoderma viride (IAM 5061), and bacteria Pseudomonas aeruginosa (ATCC 27853), Bacillus cereus (clinical isolate), and Staphylococcus aureus (ATCC 6538) with potential to prevent foodborne diseases.

Studies on Antimicrobial Activity of Aqueous Extract of Maize Silk

2011 ◽  
Vol 140 ◽  
pp. 426-430
Author(s):  
Xing Feng ◽  
Lei Wang ◽  
Mei Ling Tao ◽  
Qing Zhou
Keyword(s):  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Bacillus Subtilis ◽  
Candida Albicans ◽  
Minimum Inhibitory Concentration ◽  
Bacillus Cereus ◽  
Aqueous Extract ◽  
Inhibitory Concentration ◽  
Bacillus Coli

Objective: To study antimicrobial activity of aqueous extract of maize silk. Methods: Choose Staphylococcus aureus, Pseudomonas aeruginosa, Bacillus cereus, Bacillus coli and Candida albicans as detected germs. Using methods of agar plated diffusions and tube continuous dilution to detect antimicrobial activity and minimum inhibitory concentration of aqueous extract of maize silk. Results:(1) Aqueous extract of maize silk has antimicrobial activity against bacteria such as Staphylococcus aureus and Bacillus subtilis, and the diameter of bacteriostatic circle is 17 and 28 millimeter; Candida albicans is also inhibited by aqueous extract and its diameter of bacteriostatic circle is 24 millimeter.(2)The antimicrobial activity against Staphylococcus aureus and Bacillus subtilis is 500mg/ml and 62.5mg/ml.The minimum inhibitory concentration to Candida albicans is 125mg/ml.(3) aqueous extract of maize silk has no antimicrobial activity on Pseudomonas aeruginosa and Bacillus coli. Conclusion: Staphylococcus aureus, Bacillus subtilis and Candida albicans can be inhibited by aqueous extract of maize silk.

Green and Simple Synthesis of Silver Nanoparticles by Aqueous Extract of Perovskia abrotanoides: Characterization, Optimization and Antimicrobial Activity

2020 ◽  
Vol 21 (11) ◽  
pp. 1129-1137 ◽  
Author(s):  
Somayeh Mirsadeghi ◽  
Masoumeh F. Koudehi ◽  
Hamid R. Rajabi ◽  
Seied M. Pourmortazavi
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Minimum Inhibitory Concentration ◽  
Plant Extract ◽  
Inhibitory Concentration ◽  
Minimum Bactericidal Concentration ◽  
Extraction Temperature ◽  
Silver Particles ◽  
Silver Nps ◽  
Perovskia Abrotanoides

Background: Herein, we report the biosynthesis procedure to prepare silver nanoparticles as reduction and capping agents with the aqueous plant extract of Perovskia abrotanoides. Methods: The therapeutic application of silver nanoparticles entirely depends on the size and shape of the nanoparticles therefore, their control during the synthesis procedure is so important. The effects of synthesis factors, for example, silver ion concentration, the mass of plant extract, reaction time and extraction temperature, on the size of silver particles were considered and optimized. Several analytical methods were used for the characterization of silver NPs including FT-IR and UV–Vis spectrophotometer, XRD and SEM. Results: The results showed that the mean size of the silver particles was about 51 nm. Moreover, the antibacterial properties of biosynthesized silver NPs were investigated by the minimum inhibitory concentration, minimum bactericidal concentration, and Well-diffusion tests. The minimum inhibitory concentration/ minimum bactericidal concentration values of silver NPs and aqueous plant extract versus Gram-positive bacteria (Staphylococcus aureus and Bacillus cereus) and Gram-negative bacteria (E. coli) were 3.03/0.00, 1.20/0.01, 3.06/0.00, 0.98/1.04, 1.00/0.05 and 1.30/0.03 (mg/mL), respectively. Conclusion: The antimicrobial activity study displayed that the synthesized silver nanoparticles by plant extract have better antimicrobial properties compared to aqueous plant extract of Perovskia abrotanoides.

scholarly journals Antimicrobial Metabolites against Methicillin-Resistant Staphylococcus aureus from the Endophytic Fungus Neofusicoccum australe

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1094
Author(s):  
Melissa M. Cadelis ◽  
Soeren Geese ◽  
Benedict B. Uy ◽  
Daniel R. Mulholland ◽  
Shara J. van de Pas ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Natural Products ◽  
Structure Elucidation ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Inhibitory Concentration ◽  
Spectroscopic Methods ◽  
Methicillin Resistant ◽  
Bioassay Guided Fractionation ◽  
Antimicrobial Metabolites

Antimicrobial bioassay-guided fractionation of the endophytic fungi Neofusicoccum australe led to the isolation of a new unsymmetrical naphthoquinone dimer, neofusnaphthoquinone B (1), along with four known natural products (2–5). Structure elucidation was conducted by nuclear magnetic resonance (NMR) spectroscopic methods, and the antimicrobial activity of all the natural products was investigated, revealing 1 to be moderately active towards methicillin-resistant Staphylococcus aureus (MRSA) with a minimum inhibitory concentration (MIC) of 16 µg/mL.

scholarly journals Synergistic Effect of Plant Extracts on Endodontic Pathogens Isolated from Teeth with Root Canal Treatment Failure: An In Vitro Study

Antibiotics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 552
Author(s):  
Suraj Arora ◽  
Shahabe Saquib ◽  
Youssef Algarni ◽  
Mohammed Kader ◽  
Irfan Ahmad ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Synergistic Effect ◽  
Enterococcus Faecalis ◽  
Plant Extracts ◽  
Azadirachta Indica ◽  
Inhibitory Concentration ◽  
Pathogenic Microorganisms ◽  
Salvadora Persica ◽  
Actinomyces Naeslundii

Background and objectives: This study aimed to evaluate the synergistic antimicrobial activity of extracts obtained from Salvadora persica (Miswak), Commiphora molmol (myrrh) and Azadirachta indica (neem) in combination with commercially available antimicrobial agents: penicillin, tetracycline, ofloxacin and fluconazole on endodontic pathogens such as Enterococcus faecalis, Streptococcus mitis, Actinomyces naeslundii and Candida albicans. Materials and Methods: Microbiological samples from the root canals of the teeth undergoing retreatment were taken using sterile paper points kept at full length in the canal for 30 seconds. The disc diffusion method was used to check the susceptibility of microbes to the plant extracts and antimicrobials by measuring the diameter of the inhibition zones. Against the microbes, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC)/minimum fungicidal concentration (MFC) of the plant extracts were assessed. The fractional inhibitory concentration index (FICI) was used to estimate the synergistic effect of plant extracts combined with antimicrobials against the resistant endodontic microbes. Results: The findings clearly indicate the effectiveness of all the three plant extracts, Commiphora molmol, Azadirachta indica, Salvadora persica, against all the experimental pathogenic microorganisms except for the ineffectiveness of Azadirachta indica, Salvadora persica against Candida albicans. Maximum antimicrobial activity was displayed by Azadirachta indica against Enterococcus faecalis (MIC = 0.09 ± 1.2 mg/mL, MBC = 0.78 ± 1.25 mg/mL) and the minimum antimicrobial activity was displayed by Commiphora molmol against Actinomyces naeslundii (MIC = 12.5 ± 3.25 mg/mL, MBC = 100 ± 3.75 mg/mL). The best synergy was displayed by Commiphora molmol with fluconazole against Candida albicans (FICI = 0.45). Conclusions: The current study delineates the variable antimicrobial activity of plant extracts against the experimental endodontic pathogenic microorganisms. Plant extracts in conjunction with various antimicrobials can be valuable aids in combating relatively resistant endodontic microorganisms that have been the cause of worry in recent years, leading to failure even in treatment procedures following all required protocols.

scholarly journals Evaluation of antimicrobial activity of the endophytic actinomycete R18(6) against multiresistant Gram-negative bacteria

2016 ◽  
Vol 88 (1) ◽  
pp. 155-163 ◽  
Author(s):  
Tiele Carvalho ◽  
Sueli Van Der Sand
Keyword(s):  
Antimicrobial Activity ◽  
Inhibitory Concentration ◽  
Proteolytic Enzymes ◽  
Gram Negative Bacteria ◽  
Bacteriostatic Activity ◽  
Submerged Cultures ◽  
Gram Negative ◽  
Endophytic Actinomycete ◽  
Endophytic Actinomycetes ◽  
Antimicrobial Substances

Endophytic actinomycetes are promising sources of antimicrobial substances. This study evaluates the activity of metabolites produced by the endophytic actinomycete R18(6) against Gram-negative bacteria multiresistant to antimicrobials. R18(6) isolate was grown in submerged cultures under different conditions: carbon source, temperature, pH and incubation time to optimize antimicrobials production. The actinomycete grown in base medium supplemented with 1% glucose, pH 6.5 and incubation at 30 ºC for 96 h with shaking at 100 rpm, exhibited the highest activity against the used Gram-negative bacteria. Minimum inhibitory concentration (MIC) of the crude extract produced by the microorganism varied between 1/32 and 1/256. It had bactericide or bacteriostatic activity, depending on the Gram-negative organism. The active extract was stable at high temperatures, and unstable in medium containing proteolytic enzymes. Micromorphology of R18(6) was investigated by optical and scan microscopy, revealing that it was morphologically similar to the genusStreptomyces.

scholarly journals Antimicrobial Activity of Leaves and Flowers of Cassia auriculata linn

1970 ◽  
Vol 46 (4) ◽  
pp. 513-518 ◽  
Author(s):  
V Subhadradevi ◽  
K Asokkumar ◽  
M Umamaheswari ◽  
AT Sivashanmugam ◽  
JR Ushanandhini ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Agents ◽  
Inhibitory Concentration ◽  
Dominant Role ◽  
Ethanolic Extract ◽  
Diffusion Method ◽  
Cassia Auriculata ◽  
Potential Source ◽  
Wide Range ◽  
Ancient Times

Since ancient times plant as sources of medicinal compounds have continued to play a dominant role in the maintenance of human health. To treat chronic and infectious diseases plants used in traditional medicine contain a wide range of ingredients. In this regard, Cassia auriculata L. (Caesalpiniaceae) is widely used in Ayurvedic medicine as a tonic, astringent and as a remedy for diabetes, conjunctivitis, ulcers, leprosy, skin and liver diseases. The aim of present study was to evaluate the antimicrobial activity of ethanolic extract of Cassia auriculata leaves and flowers (CALE & CAFE). CALE and CAFE exhibited broad spectrum antimicrobial activity against standard strains of Staphylococcus aureus, Escherichia coli and Bacillus subtilis and exhibited no antifungal activity against standard strains of Candida albicans and Aspergillus niger. Minimum inhibitory concentration (MIC) and Minimum bactericidal concentration (MBC) was carried out for CALE and CAFE. The results obtained in the present study indicate that the CALE and CAFE can be a potential source of natural antimicrobial agents. Key words: Cassia auriculata; Antimicrobial activity; Agar well diffusion method. DOI: http://dx.doi.org/10.3329/bjsir.v46i4.9600 BJSIR 2011; 46(4): 513-518

scholarly journals Preliminary phytochemical screening and susceptibility of bacteria pathogens to whole extract of evolvulus alsinoides (L.)

1970 ◽  
Vol 18 ◽  
pp. 16-20
Author(s):  
BA Omogbai ◽  
FA Eze
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Antibacterial Activity ◽  
Bacillus Cereus ◽  
Pathogenic Bacteria ◽  
Volatile Oil ◽  
Salmonella Typhi ◽  
Phytochemical Screening ◽  
Evolvulus Alsinoides ◽  
And Staphylococcus Aureus

Context: Plant based antimicrobial represent a vast untapped source for medicines and further exploration of plant antimicrobial neeto occur. Evolvulus alsinoides (L) (Convolvulaceae) is a perennial herb is used in traditional medicine in East Asia, India, Africa and Philippines to cure fever, cough, cold, venereal diseases, azoospermia, adenitis and dementia.   Objective: The objective of this research was to evaluate the antimicrobial activity of the extracts of E. alsinoides on some clinical microbial isolates.   Materials and Methods: The ed thanolic and aqueous extracts of the whole plant (leaves and twigs) were analysed for alkanoids, tannins, glycosides, steroids, flavonoids, saponins, volatile oil and resins. The determination of antibacterial activity was done using the agar well diffusion technique. Pure cultures of pathogenic bacteria such as Bacillus cereus, Staphylococcus aureus, Micrococcus leutus, Klebsiella Pneumoniae, Pseudomonas aeruginosa, Escherichia coli and Salmonella typhi were used for antibacterial activity assay, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC).   Results: The ethanolic extract of the plant had MIC values ranging from 16 mg/ml to 512.5 mg/ml. The least MIC was 16mg-ml against Salmonella typhi while Bacillus cereus and Staphylococcus aureus showed the highest MIC of 512.5 mg-ml. In the aqueous extract the MIC ranged between 512.5 to >1025 mg/ml. Salmonella typhi, Micrococcus luteus and Staphylococcus aureus were not inhibited by the water extract. Phytochemical result showed ethanol to be a better solvent for the extraction of the bioactive agents in this plant which include: glycosides, alkaloids, saponins, tannins, flavonoids and volatile oil.   Conclusion: In this study the gram-negative organisms had the lowest MICs and MBCs. This suggests their higher susceptibility to the extract of this plant. On the basis of the result obtained in this investigation it can be concluded that ethanol extract of Evolvulus alsinoides had significant in vitro broad spectrum antimicrobial activity.   Keywords: Evolvulus alsinoides; Phytochemical screening; Antibacterial activity. DOI: http://dx.doi.org/10.3329/jbs.v18i0.8769 JBS 2010; 18(0): 16-20

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