scholarly journals Gamma radiation as a green method to enhance the dielectric behaviour, magnetization, antibacterial activity and dye removal capacity of Co–Fe LDH nanosheets

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32544-32561 ◽  
Author(s):  
Rafat M. Amin ◽  
Mohamed Taha ◽  
S. A. Abdel Moaty ◽  
Fatma I. Abo El-Ela ◽  
Hossam F. Nassar ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Gamma Radiation ◽  
Dye Removal ◽  
Chemical Properties ◽  
Dielectric Behaviour ◽  
Green Method ◽  
Removal Capacity ◽  
Physico Chemical

Nowadays, improving the physico-chemical properties of nanomaterials to enhance their performance towards various applications is urgent.

Autoclave-assisted green synthesis of silver nanoparticles using A. fumigatus mycelia extract and the evaluation of their physico-chemical properties and antibacterial activity

2018 ◽  
Vol 7 (3) ◽  
pp. 217-224 ◽  
Author(s):  
Sarah Ghanbari ◽  
Hamideh Vaghari ◽  
Zahra Sayyar ◽  
Mohammad Adibpour ◽  
Hoda Jafarizadeh-Malmiri
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Chemical Properties ◽  
Heating Time ◽  
Gram Negative Bacteria ◽  
Synthesis Conditions ◽  
High Antibacterial Activity ◽  
Physico Chemical ◽  
Ft Ir

Abstract Silver nanoparticles (AgNPs) were synthesized using Aspergillus fumigatus (A. fumigatus) mycelia extract via the hydrothermal method. The main reducing and stabilizing groups and components of A. fumigatus extract, such as amine, hydroxyl, amid, protein, enzymes, and cell saccharide compounds, were identified by Fourier transform infrared (FT-IR). Central composition design was used to plan the experiments, and response surface methodology was applied to evaluate of the effects of independent variables, including the amount of the prepared extract (5–7 ml) and heating time (10–20 min) at 121°C and 1.5 bar), on the particle size of the synthesized AgNPs, as manifested in broad emission peak (λmax). More stable and spherical monodispersed AgNPs, with mean particle size, polydispersity index (PDI) value, and maximum ζ potential value of 23 nm, 0.270, and +35.3 mV, respectively, were obtained at the optimal synthesis conditions using 7 ml of A. fumigatus extract and heating time of 20 min. The synthesized AgNPs indicated high antibacterial activity against both Gram-positive and Gram-negative bacteria.

Effect of gamma radiation on the physico-chemical properties of alginate-based films and beads

2012 ◽  
Vol 81 (8) ◽  
pp. 945-948 ◽  
Author(s):  
Tanzina Huq ◽  
Avik Khan ◽  
Dominic Dussault ◽  
Stephane Salmieri ◽  
Ruhul A. Khan ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Chemical Properties ◽  
Physico Chemical

scholarly journals Dependence of Antibacterial Activity of ZnO Powders on Their Physico-chemical Properties

2019 ◽  
Vol 66 (9) ◽  
pp. 434-441
Author(s):  
Thi Minh Phuong NGUYEN ◽  
Ken HIROTA ◽  
Masaki KATO ◽  
Kazuhiko TSUKAGOSHI ◽  
Hirohisa YAMADA ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Chemical Properties ◽  
Physico Chemical ◽  
Zno Powders

Gamma Radiation Treated Chitosan Solution for Strawberry Preservation: Physico-Chemical Properties and Sensory Evaluation

2016 ◽  
Vol 60 ◽  
pp. 30-37 ◽  
Author(s):  
Sakila Jesmin ◽  
Abdullah Al-Jubayer ◽  
Saad bin Eusuf ◽  
A.H.M. Kamal ◽  
Jahid M.M. Islam ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Shelf Life ◽  
Chemical Properties ◽  
Ascorbic Acid Content ◽  
Chitosan Solution ◽  
Cell Wall Degrading Enzymes ◽  
Physico Chemical ◽  
Positive Effect ◽  
Control Samples

The research was designed to extend shelf life of stored strawberry by bioactive chitosan coating. Strawberry fruits were dipped for 2 min in different concentration of irradiated chitosan (300, 500, 1000 and 1500 ppm) solution which were subjected to different gamma radiation doses (30, 40, 50 and 60 kGy) while uncoated fruits were served as control. Samples were packed in zip bags and stored in 4°C and kept for observation. Fruits treated with 50 kGy irradiated chitosan at 1500 ppm concentration showed significant delays in the change of weight loss, decay percentage, pH, and ascorbic acid content as compared with the uncoated control fruits. Samples stored in 4°C and packed in zip bags showed an increased shelf life up to 21 days whereas control samples with same condition could maintain edible quality only up to 3 days. Compared to the controls, all coating formulations had positive effect on the inhibition of cell wall degrading enzymes. These findings suggest that the use of irradiated chitosan coatings can be very useful for extending the shelf-life and maintaining quality of strawberry fruit.

scholarly journals OPTIMIZATION AND CHARECTERIZATION OFINTRACELLULAR ORANGE FLUORESCENT PIGMENT FROM BACILLUS ENDOPHYTICUS (AVP-9(Kf527823)

2017 ◽  
pp. 67-74
Author(s):  
Mantri Sai Ram ◽  
Nokku Pradeep Kumar ◽  
C. V. S. Bhaskar ◽  
Amrutha V. Audipudi
Keyword(s):  
Antibacterial Activity ◽  
Maximum Yield ◽  
Chemical Properties ◽  
High Yield ◽  
Agricultural Field ◽  
Orange Pigment ◽  
Fluorescent Pigment ◽  
Cultural Conditions ◽  
Physico Chemical ◽  
Bacillus Endophyticus

Objective: Our study aimed to characterize and optimize the physico-chemical properties which render the high yield of intracellular orange fluorescent pigment (IOFP) and its antibacterial activity against clinical pathogens.Methods: Intracellular orange fluorescent pigment (IOFP) extracted from Bacillus endophyticus AVP-9(Kf527823) a rhizobacteria of chilli agricultural field using different solvent systems, fractioned by TLC and analyzed for absorption maxima. Purified pigment was screened for antimicrobial activity against clinical pathogen, Optimization of cultural conditions for maximizing the yield of pigment and compared the yield in different broth media.Results: AVP-9(Kf527823) showed circular, large orange color colonies which fluoresced orange under U. V light,. Intracellular pigment affectively extracted in acetone showed a bright fluorescent orange spot on the TLC plate, and absorption maxima at 493 nm. Antibacterial activity of isolated pigment showed highest zone of inhibition against E. coli and least to Pseudomonas. Maximum yield of the pigment was achieved in modified nutrient brot (MNB)h medium containing 2% w/v nutrient broth containing1% w/v glucose,1% w/v peptone and0.5% methionine at 35 °C and pH 7.0 with 48 h of incubation period. The yield was observed maximum in MNB. Compared to lactose broth, Tryptone soya broth and peptone water.Conclusion: Bright fluorescent orange pigment of Bacterium avp-9(Kf527823) with absorption maxima at 493 indicating that the pigment shows the characters of carotenoids. Yield maximum in MNB and its potential antibacterial activity needs further investigation for pharmaceutical applications.

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