Antibacterial and Effective Air Filtration Membranes by “Green” Electrospinning and Citric Acid Crosslinking

2018 ◽  
Vol 23 ◽  
pp. 52-58 ◽  
Author(s):  
Miaomiao Zhu ◽  
Dawei Hua ◽  
Ming Zhong ◽  
Lingfeng Zhang ◽  
Fang Wang ◽  
...  
Keyword(s):  
Citric Acid ◽  
Air Filtration ◽  
Filtration Membranes

scholarly journals Recyclable, Antibacterial, Isoporous Through-Hole Membrane Air Filters with Hydrothermally Grown ZnO Nanorods

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3381
Author(s):  
Yong Ho Choi ◽  
Moon-Ju Kim ◽  
Jia Lee ◽  
Jae-Chul Pyun ◽  
Dahl-Young Khang
Keyword(s):  
High Temperature ◽  
Membrane Surface ◽  
Zno Nanorods ◽  
Air Filtration ◽  
Seed Formation ◽  
Concurrent Control ◽  
Membrane Filters ◽  
Filtration Membranes ◽  
Uv Illumination ◽  
Through Hole

Reusable, antibacterial, and photocatalytic isoporous through-hole air filtration membranes have been demonstrated based on hydrothermally grown ZnO nanorods (NRs). High-temperature (300~375 °C) stability of thermoset-based isoporous through-hole membranes has enabled concurrent control of porosity and seed formation via high-temperature annealing of the membranes. The following hydrothermal growth has led to densely populated ZnO NRs on both the membrane surface and pore sidewall. Thanks to the nanofibrous shape of the grown ZnO NRs on the pore sidewall, the membrane filters have shown a high (>97%) filtration efficiency for PM2.5 with a rather low-pressure (~80 Pa) drop. The membrane filters could easily be cleaned and reused many times by simple spray cleaning with a water/ethanol mixture solution. Further, the grown ZnO NRs have also endowed excellent bactericidal performance for both Gram-positive S. aureus and Gram-negative S. enteritidis bacteria. Owing to the wide bandgap semiconductor nature of ZnO NRs, organic decomposition by photocatalytic activity under UV illumination has been successfully demonstrated. The reusable, multifunctional membrane filters can find wide applications in air filtration and purification.

A natural polysaccharide-based antibacterial functionalization strategy for liquid and air filtration membranes

2021 ◽  
Author(s):  
Ruonan Wu ◽  
Mengkai Song ◽  
Dandan Sui ◽  
Shun Duan ◽  
Fujian Xu
Keyword(s):  
Nosocomial Infections ◽  
Bacterial Contamination ◽  
Air Filtration ◽  
Filtration Membranes ◽  
Natural Polysaccharide ◽  
Antibacterial Functionalization

Filtration membranes are widely applied in medical fields. However, these membranes are challenged by bacterial contamination in hospitals, which increases the risk of nosocomial infections. Thus, it is significant to...

Nonhazardous Electrospun Biopolymer Nanofibrous Membrane for Antibacterial Filter

NANO ◽  
2020 ◽  
Vol 15 (07) ◽  
pp. 2050085
Author(s):  
Yaying You ◽  
Feng Chen ◽  
Junchao Qian ◽  
Qianyu Yan ◽  
Zhigang Chen
Keyword(s):  
Natural Environment ◽  
Antibacterial Agent ◽  
Transmission Rate ◽  
Effective Means ◽  
Nanofibrous Membrane ◽  
Gram Negative Bacteria ◽  
Air Filtration ◽  
Filtration Membranes ◽  
Rate Test ◽  
Nanofibrous Membranes

Respiratory disease caused by the presence of bacteria in the atmosphere seriously threatens human health. Air pollution as harmful suspended particles, like haze, is conducive to bacterial spread and growth; it must be prevented to avoid harming the respiratory tract. Herein, filtration membranes possessing superior antibacterial activity are considered as an effective means to protect humans from atmospheres contaminated with bacteria. The aim of this study is to prepare an environmentally friendly and biodegradable multifunctional biopolymer composite nanofibrous membrane, which can be used as a candidate material for air filtration applications. Since traditional air filtration materials do not degrade in the natural environment, we synthesized a nanofibrous membrane composed of gelatin (GT) and silk fibroin (SF), in which antibacterial agent can anchor via electrostatic spinning. Also, both GT and SF can break down in the natural environment, which avoids secondary pollution of the atmosphere. Preliminary experiments show that GS nanofibrous membranes are excellent carriers of antibacterial agent for antibacterial applications. Several characterizations and testing measurements indicate that resultant nanofibrous membranes are effective against Gram-positive and Gram-negative bacteria. Moreover, a water vapor transmission rate test shows the excellent filtration performance of the materials.

Coadministration of citric acid allows oxytetracycline dose reduction in yellowtail Seriola quinqueradiata infected with Vibrio anguillarum

2020 ◽  
Vol 140 ◽  
pp. 25-29
Author(s):  
K Akiyama ◽  
N Hirazawa ◽  
A Hatanaka
Keyword(s):  
Body Weight ◽  
Citric Acid ◽  
Effective Treatment ◽  
Dose Reduction ◽  
Vibrio Anguillarum ◽  
Enhancing Effect ◽  
Bacterial Diseases ◽  
Seriola Quinqueradiata ◽  
Poor Efficacy

Oxytetracycline (OTC) has been commonly used as an effective antibiotic against various fish bacterial diseases, including vibriosis. In this study, the absorption-enhancing effect of citric acid on oral OTC pharmacokinetics and treatment of artificial Vibrio anguillarum infection was evaluated in juvenile yellowtail Seriola quinqueradiata followed by serum OTC concentration analysis. When 25 mg kg-1 body weight (BW) OTC was administered in combination with 1250 mg kg-1 BW citric acid, the serum OTC concentration reached almost the same concentration as that of the group treated with 50 mg kg-1 BW OTC. This coadministration successfully suppressed mortality due to vibriosis similar to the group treated with 50 mg kg-1 BW OTC. Conversely, poor efficacy was observed when only 25 mg kg-1 BW OTC was administered. These results suggest that coadministration of citric acid can be beneficial in reducing the dose of OTC needed for effective treatment, and thus contributes to the goal of reduced use of this antibiotic in aquaculture.

EFFECT OF SERUM GONADOTROPHIN ON DEHYDROGENASES OF THE CITRIC ACID CYCLE IN THE OVARY OF THE RAT

1963 ◽  
Vol 42 (4) ◽  
pp. 480-484 ◽  
Author(s):  
B. Eckstein ◽  
R. Landsberg
Keyword(s):  
Citric Acid ◽  
Citric Acid Cycle ◽  
Age Groups ◽  
Succinic Dehydrogenase ◽  
Immature Rat ◽  
Acid Cycle ◽  
Immature Rats ◽  
Rat Ovary

ABSTRACT The succinic, malic and isocitric dehydrogenases in the ovary of immature and mature, normal and serum gonadotrophin injected rats were examined. The Qo2 of these enzymes were markedly enhanced in the gonadotrophin injected rats of both age groups, except in the case of succinic dehydrogenase in the ovary of the immature rats, where a slight non-significant decrease was noted. It is concluded that in the mature rat ovary, gonadotrophin administration stimulates the activity of all the examined dehydrogenases of the citric acid cycle, whereas in the immature rat ovary, at least the isocitric- and malic dehydrogenases are thus stimulated.

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