scholarly journals An Improved Halo Method for Evaluating the Antibacterial Activity of Leather

2020 ◽  
Vol 20 (3) ◽  
pp. 229-236
Author(s):  
Jinwei Zhang ◽  
Qiuyue Tang ◽  
Wuyong Chen ◽  
Hongbin Sun ◽  
Qiming Ou ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Intraclass Correlation ◽  
Antibacterial Activities ◽  
New Method ◽  
Culture Dish ◽  
Nano Silver ◽  
Testing Method ◽  
Sterile Medium ◽  
The Difference ◽  
Better Than

In order to evaluate leather antibacterial activity rapidly and accurately, an improved halo method was developed based on conventional halo method and the agar diffusion plate method. During the new method, there were two layers of medium, the bottom was sterile medium and the top was medium containing microbes; more than one leather sample could be tested in a culture dish. The antibacterial activities of leather treated by nano-silver, nano-ZnO and butyl paraben against Escherichia coli, Staphylococcus aureus, Aspergillus niger and Rhodotorula mucilaginosa were tested by the new method. The results indicated intraclass correlation coefficient values were greater than 0.7 but the P values were less than 0.05 during improved halo method testing, thus, the repeatability and reliability was comparable or even better than conventional method. Nano-silver showed excellent and broad antibacterial activity and the difference between each antibacterial agent could be observed clearly and intuitively during improved halo method testing. In sum, improved halo method was a fast, accurate, qualitative and quantitative testing method and would be a new choice for evaluating leather antibacterial activity.

scholarly journals A comparison of the antibacterial activity of some African black soaps and medicated soaps commonly used for the treatment of bacteria-infected wound

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Olufunmiso O. Olajuyigbe ◽  
Morenike O. Adeoye-Isijola ◽  
Otunola Adedayo
Keyword(s):  
Antibacterial Activity ◽  
Inhibitory Concentration ◽  
Waste Product ◽  
Antibacterial Activities ◽  
Traditional Use ◽  
E Coli ◽  
African Black ◽  
Soap Production ◽  
Inhibition Zones ◽  
Better Than

Background: Black soap is a medicinal product that could be harnessed for economic purpose if properly packaged, and misconception about its traditional use by herbalists is thrown overboard.Aims: To promote the relevance of these soaps for economic development, this study compared the antibacterial activity of black soaps with medicated soaps widely used against bacterial infections.Methods: The antibacterial activities of these soap samples were determined by agar diffusion and macrobroth dilution methods.Results: In this study, the statistical analysis of the inhibition zones showed that black soaps were significantly (p < 0.05) more active than medicated soaps used against the test bacterial isolates. The black soaps inhibited and killed the isolates better than the medicated soaps at the different concentrations used. The minimum inhibitory concentration for Klebsiella pneumoniae and Enterococcus faecalis ranged between 0.125 mg/mL and 2 mg/mL, Staphylococcus aureus (0.25–4) mg/mL, Escherichia coli (0.125–4) mg/mL and Pseudomonas aeruginosa (1–4) mg/mL. The result showed that K. pneumoniae and E. faecalis were the most susceptible, followed by E. faecalis > E. coli > S. aureus > P. aeruginosa.Conclusion: As a valuable medicinal output derivable from organic waste product that could be converted to wealth, African black soap production, utilisation and commercialisation have tremendous economic potentials. These soaps showed significant antibacterial activity greater than those of the medicated soaps. Hence, their use could be a better option in place of commercially available medicated and antiseptic soaps because of the degree of antibacterial activities they exhibited.

Preparation, Characterization and Antibacterial Activity of Chitosan Schiffbases

2011 ◽  
Vol 287-290 ◽  
pp. 1947-1951 ◽  
Author(s):  
Jing Xian Xu ◽  
Ye Ting Lin ◽  
Qiang Lin ◽  
Wen Yuan ◽  
Xue Qiong Yin ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Schiff Bases ◽  
Optical Density ◽  
Elemental Analysis ◽  
Antibacterial Activities ◽  
Cp Mas Nmr ◽  
And Staphylococcus Aureus ◽  
Better Than

Two Schiff bases of chitosan (CTS) were synthesized from 4-methoxylbenzylaldehyde (CH3O-CTS) and 4-methylbenzylaldehyde(CH3-CTS). The Schiff bases were characterized by FTIR, DSC-TGA, solid13C CP-Mas NMR, and elemental analysis. Antibacterial activities of the Schiff bases against Escherichia coli and Staphylococcus aureus were measured by the optical density method. The antibacterial activity of the Schiff bases is better than that of the original CTS. The IC50of CH3O-CTS and CH3-CTS againstEscherichia coliis respectively 40.3 ppm and 43 ppm, which being 38.5 ppm and 39.5 ppm against Staphylococcus aureus, lower than IC50of chitosan, being 59.5 ppm and 52 ppm againstEscherichia coliand Staphylococcus aureus, respectively.

scholarly journals Design, Synthesis, and Biological Activity of Novel Myricetin Derivatives Containing Amide, Thioether, and 1,3,4-Thiadiazole Moieties

Molecules ◽  
2018 ◽  
Vol 23 (12) ◽  
pp. 3132 ◽  
Author(s):  
Xianghui Ruan ◽  
Cheng Zhang ◽  
Shichun Jiang ◽  
Tao Guo ◽  
Rongjiao Xia ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Pathogenic Bacteria ◽  
Antibacterial Activities ◽  
Xanthomonas Oryzae ◽  
Design Synthesis ◽  
Antiviral Activities ◽  
Potential Alternative ◽  
Better Than

A series of myricetin derivatives containing amide, thioether, and 1,3,4-thiadiazole moieties were designed and synthesized, and their antiviral and antibacterial activities were assessed. The bioassays showed that all the title compounds exhibited potent in vitro antibacterial activities against Xanthomonas citri (Xac), Ralstonia solanacearum (Rs), and Xanthomonas oryzae pv. Oryzae (Xoo). In particular, the compounds 5a, 5f, 5g, 5h, 5i, and 5l, with EC50 values of 11.5–27.3 μg/mL, showed potent antibacterial activity against Xac that was better than the commercial bactericides Bismerthiazol (34.7 μg/mL) and Thiodiazole copper (41.1% μg/mL). Moreover, the in vivo antiviral activities against tobacco mosaic virus (TMV) of the target compounds were also tested. Among these compounds, the curative, protection, and inactivation activities of 5g were 49.9, 52.9, and 73.3%, respectively, which were better than that of the commercial antiviral Ribavirin (40.6, 51.1, and 71.1%, respectively). This study demonstrates that myricetin derivatives bearing amide, thioether, and 1,3,4-thiadiazole moieties can serve as potential alternative templates for the development of novel, highly efficient inhibitors against plant pathogenic bacteria and viruses.

scholarly journals Green synthesis, characterization and antibacterial activities of silver nanoparticles from strawberry fruit extract

2017 ◽  
Vol 19 (4) ◽  
pp. 128-136 ◽  
Author(s):  
Saviour A. Umoren ◽  
Alexis M. Nzila ◽  
Saravanan Sankaran ◽  
Moses M. Solomon ◽  
Peace S. Umoren
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Room Temperature ◽  
Size Range ◽  
Antibacterial Activities ◽  
Inhibitory Effect ◽  
Strawberry Fruit ◽  
Fruit Extract ◽  
Vis Spectroscopy ◽  
Better Than

Abstract Silver nanoparticles (AgNPs) have been synthesized in the presence of Strawberry fruit extract (SBFE) at room temperature. The synthesized AgNPs was characterized by UV-vis spectroscopy, SEM, EDS, XRD, TEM and FTIR. The UV-vis spectra of the AgNPs show SPR band at 450 nm. TEM results indicate that AgNPs are spherical in shape and size range between 7–65 nm. Antibacterial activity of the synthesized AgNPs has been assessed against Pseudomonas aeruginosa and Bacillus licheniformis. The results show that AgNPs exhibit inhibitory effect and effect is a function of AgNPs concentration. The antibacterial activity of the prepared AgNPs has been compared with two antibiotics, amoxicillin and ciprofloxacin. It is found that the antibiotics perform better than AgNPs.

Preparation and Antibacterial Activity of Silver Ions-Substituted Hydroxyapatite/Titania

2006 ◽  
Vol 510-511 ◽  
pp. 78-81 ◽  
Author(s):  
Guo Yu Lv ◽  
Yu Bao Li ◽  
Ai Ping Yang ◽  
Xiang Zhang ◽  
Wei Hu Yang ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Composite Materials ◽  
Silver Ions ◽  
Antibacterial Activities ◽  
Bacterial Strains ◽  
X Ray Diffraction ◽  
Disk Diffusion Test ◽  
Transmission Electron ◽  
Dose Dependent ◽  
Better Than

In this paper a series of silver ions-substituted hydroxyapatites (HA) were prepared. The antibacterial activities of these materials on textiles against bacteria have been investigated. Titania (TiO2) was selectively added into the materials to decrease the silver-ions concentration to get the same active antimicrobial effects. The microstructure, the shape and size, concentration of silver, and the groups of the composite materials were characterized using transmission electron microscopy (TEM), infrared spectroscopy (IR), Atomic absorption spectroscopy (AAS), and X-ray diffraction (XRD). The results showed that there was a dose dependent-effect of silver-ions concentration from the disk diffusion test. The higher the silver-ions concentration, the better the antibacterial activity of the composite materials was. Keeping silver-ions concentration constant, the antibacterial activity of the materials for adding Titania was better than that of without Titania. Moreover, the addition of Titania would inhibit the discolouration of the composite materials. The antibacterial activities of the composite materials differentiate to some extent with the bacterial strains.

Antibacterial potential of essential oils of Zataria multiflora and Mentha piperita, micro- and nano-formulated forms

2020 ◽  
Author(s):  
Mahmoud Osanloo ◽  
Abbas Abdollahi ◽  
Alireza Valizadeh ◽  
Niloufar Abedinpour
Keyword(s):  
Particle Size ◽  
Antibacterial Activity ◽  
Essential Oils ◽  
Pathogenic Bacteria ◽  
Antibacterial Activities ◽  
Mentha Piperita ◽  
Zataria Multiflora ◽  
Microdilution Method ◽  
Better Than ◽  
Antibacterial Potential

Background and Objectives: Plant-derived essential oils (EOs) shave many usages in health and medicine, such as anti- bacterial agents. The aim of this study was the improvement of antibacterial activities of two EOs using nanotechnology. Materials and Methods: Antibacterial activity was investigated on four important human pathogenic bacteria using the 96-well plate microdilution method, a quantitative approach. Eleven formulations were prepared using each of the EOs. Eventually, the best nanoformulation with the smallest particle size and polydispersive indices (PDI and SPAN) was selected using each EO for further investigations. Moreover, two microemulsions with similar ingredients and the same portion in comparison with two selected nanoemulsions were also prepared. Antibacterial activity of each EO was compared with its micro- and nano-emulsions. Results: The antibacterial efficacy of Zataria multiflora EO (ZMEO) was significantly better than Mentha piperita EO (MPEO). Besides, the antibacterial activity of nanoemulsion of ZMEO with a particle size of 129 ± 12 nm was significantly better than no- and micro-formulated forms of ZMEO. Interestingly, the efficiency of MPEO nanoemulsion (160 ± 25 nm) was also significantly better than MPEO and its micro-formulated form. Conclusion: Regardless of the intrinsic antibacterial property of two examined EOs, by formulating to nanoemulsion, their efficiencies were improved. Nanoemulsion of ZMEO introduced as an inexpensive, potent and green antibacterial agent.

scholarly journals Key Parameters on the Antibacterial Activity of Silver Camphor Complexes

Antibiotics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 135
Author(s):  
Joana Costa ◽  
Sílvia Sousa ◽  
Adelino Galvão ◽  
J. Mata ◽  
Jorge Leitão ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Antibacterial Activities ◽  
Surface Structures ◽  
Gram Positive ◽  
Gram Negative ◽  
Burkholderia Contaminans ◽  
Positive Strain ◽  
Cell Surface Structures ◽  
Low Sensitivity ◽  
Better Than

Nine new complexes with camphor imine or camphor sulfonimine ligands were synthesized and analytically and spectroscopically characterized, aiming to identify the key parameters that drive the antibacterial activity of the complexes with metal cores and imine substituents with distinct electronic and steric characteristics. The antimicrobial activity of all complexes was evaluated by determining their minimum inhibitory concentrations (MIC) against the Gram-negative Escherichia coli ATCC25922, Pseudomonas aeruginosa 477, and Burkholderia contaminans IST408, and the Gram-positive Staphylococcus aureus Newman. Camphor imine complexes based on the hydroxyl silver center ({Ag(OH)}) typically perform better than those based on the nitrate silver center ({Ag(NO3)}), while ligands prone to establish hydrogen bonding facilitate interactions with the bacterial cell surface structures. A different trend is observed for the silver camphor sulfonimine complexes that are almost non-sensitive to the nature of the metal cores {Ag(OH)} or {Ag(NO3)} and display low sensitivity to the Y substituent. The antibacterial activities of the Ag(I) camphor sulfonimine complexes are higher than those of the camphor imine analogues. All the complexes display higher activity towards Gram-negative strains than towards the Gram-positive strain.

Preparation and characterization of reactive chitosan quaternary ammonium salt and its application in antibacterial finishing of cotton fabric

2016 ◽  
Vol 87 (6) ◽  
pp. 759-765 ◽  
Author(s):  
W Zhang ◽  
JJ Zhou ◽  
XL Dai
Keyword(s):  
Antibacterial Activity ◽  
Ammonium Chloride ◽  
Cotton Fabric ◽  
Ammonium Salt ◽  
Chemical Reaction ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Antibacterial Activities ◽  
Water Soluble ◽  
Better Than

The water soluble and reactive O-methyl acrylamide quaternary ammonium salt of chitosan (NMA-HTCC) was prepared with a view to develop an antibacterial finishing on cotton fabric. 2-hydroxypropyltrimethyl ammonium chloride chitosan (HTCC) was synthesized by the chemical reaction of chitosan and 2,3-epoxypropyltrimethyl ammonium chloride. Then, NMA-HTCC with reactive groups was synthesized by the chemical reaction of HTCC and N-(hydroxymethyl) –acrylamide, and its chemical structure was characterized by the Fourier transform infrared spectroscopy and nuclear magnetic resonance (NMR). The antibacterial activities of chitosan and NMA-HTCC were tested and compared by the minimal inhibitory method. Cotton fabrics were finished by NMA-HTCC under the alkalinity condition using sodium bicarbonate as the catalyst. The antibacterial activity of cotton fabric before and after finishing was measured by the oscillation flask method. The results showed that both chitosan and NMA-HTCC had a significant antibacterial effect on staphylococcus and coli, and the antibacterial activity of NMA-HTCC was better than that of chitosan. The antibacterial activity of cotton fabric to staphylococcus and coli were significantly improved after finishing by chitosan and NMA-HTCC, and the antibacterial activity of the cotton fabric finished by NMA-HTCC was better than that finished by chitosan.

scholarly journals Synthesis and antibacterial activity of novel myricetin derivatives containing sulfonylpiperazine

2020 ◽  
Author(s):  
Jun He ◽  
Xue-Mei Tang ◽  
Ting-Ting Liu ◽  
Feng Peng ◽  
Qing Zhou ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Antibacterial Agents ◽  
Research Direction ◽  
Antibacterial Activities ◽  
Maximal Effect ◽  
Bacterial Surface ◽  
Good Antibacterial Activity ◽  
Bacterial Structure ◽  
Scanning Electron ◽  
Better Than

Abstract Myricetin derivatives containing sulfonylpiperazine were synthesized and their structures were confirmed by NMR and HRMS. The antibacterial activity results indicated that some compounds showed good antibacterial activity against Xanthomonas oryzaepv. oryzae (Xoo), Xanthomonas axonopodispv. citri (Xac) and Ralstonia solanacearum (Rs). Among them, compounds 4m and 4p revealed excellent antibacterial activities against Rs with a concentration for 50% of maximal effect (EC50) value of 4 and 4 μg/mL, which were better than the control drugs bismerthiazol (13 μg/mL) and thiodiazole-copper (185 μg/mL). As observed using scanning electron microscope (SEM), these compounds act by causing folding and deformation of the bacterial surface, resulting in incomplete bacterial structure, so as to achieve the goal of bacteriostasis. The myricetin derivatives synthesized are expected to guide the research direction of new antibacterial agents.

scholarly journals Propylene Glycol Improves Stability of the Anti-Inflammatory Compounds in Scutellaria baicalensis Extract

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 894
Author(s):  
Tseng-Ting Kao ◽  
Ming-Chao Wang ◽  
Yi-Hsuan Chen ◽  
Yu-Tung Chung ◽  
Pai-An Hwang
Keyword(s):  
Propylene Glycol ◽  
Time Course ◽  
Biological Activities ◽  
Antioxidant Properties ◽  
Antibacterial Activities ◽  
Scutellaria Baicalensis ◽  
Water Solvent ◽  
Anti Inflammatory ◽  
The Difference ◽  
Better Than

Scutellaria baicalensis root extracts have been useful for external skin care and have been commercialized for years. Here, a comprehensive study was conducted to investigate the difference between 20% propylene glycol (PG) and water used as the storage solvent for a time course analysis of their remaining biological activities and ingredient compositions versus their freshly prepared conditions. Of the four major components in the 20% PG solvent, more than 80% of the components were retained after storage for two months, but in water only baicalin and wogonin were retained. The relative antibacterial activities, antioxidant properties and anti-inflammatory activities of the 20% PG solvent group were better than those of the water solvent group. Taken together, we demonstrated that these activities improved when PG, a common solvent used in many product formulas, was used as the storage solvent for the S. baicalensis extract.

Sign in / Sign up

Export Citation Format

Share Document