scholarly journals Dissemination of Cronobacter spp. (Enterobacter sakazakii) in a Powdered Milk Protein Manufacturing Facility

2008 ◽  
Vol 74 (19) ◽  
pp. 5913-5917 ◽  
Author(s):  
N. Mullane ◽  
B. Healy ◽  
J. Meade ◽  
P. Whyte ◽  
P. G. Wall ◽  
...  
Keyword(s):  
Milk Protein ◽  
Microbial Contamination ◽  
Protein Processing ◽  
Pulsed Field Gel Electrophoresis ◽  
Enterobacter Sakazakii ◽  
Powdered Milk ◽  
Air Filters ◽  
Air Filter ◽  
Manufacturing Facility ◽  
Processing Facility

ABSTRACT The microbial contamination of air filters and possible links to contaminated product in a powdered milk protein-processing facility were investigated. Over a 10-month period, seven air filters, the environment, and powdered product were analyzed for the presence of Cronobacter spp. The effects of air filter installation, maintenance, and subsequent dissemination of Cronobacter were investigated. A total of 30 isolates were characterized by pulsed-field gel electrophoresis (PFGE). PFGE revealed the presence of three clonal populations distributed throughout the manufacturing site. This study highlights the need for proper installation of air filters to limit the dissemination of microorganisms into processing sites.

scholarly journals Air filtration improvement of konjac glucomannan-based aerogel air filters through physical structure design

2021 ◽  
Author(s):  
Hong Qian ◽  
Ying Fang ◽  
Kao Wu ◽  
Hao Wang ◽  
Bin Li ◽  
...  
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Surface Area ◽  
Physical Structure ◽  
Structure Design ◽  
Air Filtration ◽  
Air Filters ◽  
Air Filter ◽  
Purification Time

Abstract This study presents two methods to improve the air filtration performance of konjac glucomannan (KGM)-based aerogel air filters through physical structure design by changing the pore-size distribution and the surface area, using an air purifier. Results indicated that KGM-based aerogels had a comparable filtration effect with the commercial air filter with a longer purification time. This purification time could be shortened by over 50%, by changing the pore-size distribution from large size to small size or increase the surface area with the fold structure. This should boost the development of polysaccharide-based aerogel used as the air filter.

scholarly journals Eco-Friendly Poly(Vinyl Alcohol) Nanofiber-Based Air Filter for Effectively Capturing Particulate Matter

2021 ◽  
Vol 11 (9) ◽  
pp. 3831
Author(s):  
Han-Jung Kim ◽  
Dong-In Choi ◽  
Sang-Keun Sung ◽  
Su-Han Lee ◽  
Sang-Jin Kim ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Quality Factor ◽  
Vinyl Alcohol ◽  
Nonwoven Fabric ◽  
Poly Vinyl Alcohol ◽  
Contamination Level ◽  
Plastic Pollution ◽  
Air Filters ◽  
Air Filter ◽  
Filter Surface

Due to the increasing use of polypropylene-based nonwoven dust masks and air filters, environmental problems that occur due to the plastic pollution resulting from the disposal of these materials have also increased. Hence, an eco-friendly air filter based on PVA nanofibers (NFs) was fabricated by electrospinning on a nonwoven fabric, and its performance was evaluated as a filter capable of blocking or capturing particulate matter. The quality factor of the optimized PVA NF-based air filter was found to be 0.010606 Pa−1, which is lower than that of a HEPA filter (0.015394 Pa−1), but higher than that of a cabin air filter (0.010517 Pa−1) and a dust mask (0.009102 Pa−1). The contamination level of the PVA NF-based filter was analyzed by optical and structural analyses of the filter surface. Finally, the filter was soaked in water to selectively remove the contaminated PVA NF layer, and the remaining nonwoven fabric was able to be reused to make the filter.

scholarly journals Recent advances in antimicrobial air filter

2018 ◽  
Vol 67 ◽  
pp. 03016 ◽  
Author(s):  
A.A.I.A.S. Komaladewi ◽  
K. Khoiruddin ◽  
I.W. Surata ◽  
I.D.G.A. Subagia ◽  
I.G. Wenten
Keyword(s):  
Air Quality ◽  
Fine Particles ◽  
Antibacterial Properties ◽  
Antimicrobial Activities ◽  
Inorganic Nanoparticles ◽  
Secondary Source ◽  
Air Filters ◽  
Air Filter ◽  
Air Stream ◽  
And Performance

The worsening air quality has become an environmental issue since it has a serious effect on human health. This is generally attributed to airborne particles including various pathogens and others fine particles. Even though air filters show excellent removal efficiency towards pathogens, the captured microorganism can remain viable in the filter, grow, and re-suspended into an air stream resulting in a secondary source of pollutants. Considerable studies have been conducted to develop air filters which also have antibacterial properties for solving this issue. Results of several studies showed that air filters with antimicrobial activities have been successfully prepared by incorporating inorganic nanoparticles and natural plant extracts. With antibacterial properties, the air filters may be potentially used to control air quality, particularly for indoor spaces e.g. hospitals, by removing fine particles and inhibiting microorganism. In this paper, the recent development of antimicrobial air filter is reviewed. In addition, preparation and performance of developed antimicrobial filters are discussed. Prospects and challenges of antimicrobial air filter are also pointed out.

scholarly journals Antimicrobial Air Filter Coating with Plant Extracts Against Airborne Microbes

2020 ◽  
Vol 10 (24) ◽  
pp. 9120
Author(s):  
Ha Ram Byun ◽  
Seon Young Park ◽  
Ee Taek Hwang ◽  
Byoung In Sang ◽  
Jiho Min ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Plant Extracts ◽  
Photoelectron Spectroscopy ◽  
Micrococcus Luteus ◽  
Polymeric Coating ◽  
Tea Tree Oil ◽  
Air Filters ◽  
Air Filter ◽  
Tea Tree ◽  
Airborne Microbes

Antimicrobial air filters are required to protect humans from the risk of secondary bioaerosol pollution as well as airborne particles. Three plant extracts (tea-tree oil, rosemary, and garlic) were selected to replace antimicrobial chemicals in air filters. The antimicrobial activity of plant extracts was investigated using Micrococcus luteus and Escherichia coli. Phytochemicals present in the three plant extracts were identified using a gas chromatograph coupled with a mass spectrometer. The extracts were spray-coated on polyethylene terephthalate filter surfaces using silicate polymeric coating and evaluated via X-ray photoelectron spectroscopy and a scanning electron microscope with energy dispersive spectroscopy. After coating, an increase of 9.1% in the pressure drop was observed. The strain Micrococcus luteus was used to evaluate the antimicrobial activity of the air filter. After bioaerosol exposure, the tea-tree oil-coated filters immediately induced M. luteus cell inactivation (40–55%), whereas the rosemary and garlic coated filters did not. However, 48 h after exposure, a significant M. luteus inactivation of 99.99%, 99.0%, and 99.9% was recorded for concentrations of 2.89, 6.73, and 11.51 mg/cm2 for the tea-tree, rosemary, and garlic extracts, respectively. The coated filters exhibited high antimicrobial activity, thereby indicating significant potential for application as self-cleaning air filters.

scholarly journals Air Filters: Cleanable Air Filter Transferring Moisture and Effectively Capturing PM2.5 (Small 11/2017)

Small ◽  
2017 ◽  
Vol 13 (11) ◽  
Author(s):  
Xinglei Zhao ◽  
Yuyao Li ◽  
Ting Hua ◽  
Pan Jiang ◽  
Xia Yin ◽  
...  
Keyword(s):  
Air Filters ◽  
Air Filter

scholarly journals Outbreak of Necrotizing Enterocolitis Associated with Enterobacter sakazakii in Powdered Milk Formula

2001 ◽  
Vol 39 (1) ◽  
pp. 293-297 ◽  
Author(s):  
J. van Acker ◽  
F. de Smet ◽  
G. Muyldermans ◽  
A. Bougatef ◽  
A. Naessens ◽  
...  
Keyword(s):  
Necrotizing Enterocolitis ◽  
Milk Formula ◽  
Enterobacter Sakazakii ◽  
Powdered Milk

scholarly journals Antimicrobial Air Filters Using Natural Sea Salt Particles for Deactivating Airborne Bacterial Particles

2019 ◽  
Vol 17 (1) ◽  
pp. 190
Author(s):  
Sang Bin Jeong ◽  
Ki Joon Heo ◽  
Byung Uk Lee
Keyword(s):  
Escherichia Coli ◽  
Environmental Exposure ◽  
Staphylococcus Epidermidis ◽  
Deposition Time ◽  
Filtration Efficiency ◽  
Sea Salt ◽  
Air Filters ◽  
Air Filter ◽  
Aerosol Process ◽  
Microbial Contaminants

We developed an antimicrobial air filter using natural sea salt (NSS) particles. Airborne NSS particles were produced via an aerosol process and were continuously coated onto the surface of an air filter under various deposition times. The filtration efficiency and bactericidal performance of the NSS-coated filter against aerosolized bacterial particles (Staphylococcus epidermidis, Escherichia coli) were evaluated quantitatively. The filtration efficiency of the tested filter ranged from 95% to 99% depending on the deposition time, and the bactericidal performance demonstrated efficiencies of more than 98% against both tested bacterial bioaerosols when the NSS deposition ratio was more than 500 μg/cm2. The experimental results indicated that the NSS-coated filters have the potential to be used as effective antimicrobial air filters for decreasing environmental exposure to microbial contaminants.

Presence of Salmonella in the Red Meat Abattoir Lairage after Routine Cleansing and Disinfection and on Carcasses

2006 ◽  
Vol 69 (10) ◽  
pp. 2342-2351 ◽  
Author(s):  
A. SMALL ◽  
C. JAMES ◽  
S. JAMES ◽  
R. DAVIES ◽  
E. LIEBANA ◽  
...  
Keyword(s):  
Foodborne Pathogens ◽  
Gel Electrophoresis ◽  
Microbial Contamination ◽  
Antimicrobial Agents ◽  
Red Meat ◽  
Pulsed Field Gel Electrophoresis ◽  
Sensitivity Testing ◽  
Beef Carcasses ◽  
Pig Carcasses ◽  
Cull Cow

Foodborne pathogens, such as Salmonella, may remain in abattoir lairages after cleansing and pose a risk of transfer and contamination from one processing day to the next. These organisms may be transferred to the outer surface of animals held in lairage facilities, and the skin or hide may be a significant source of microbial contamination on the red meat carcasses subsequently produced. Sponge samples were taken from various sites in the lairage (n = 556), and single-pass sponge samples were taken from one side of red meat carcasses (n = 1,050) at five commercial abattoirs in Southwest England and tested for the presence of Salmonella. Of these, 6.5% of lairage samples were positive, containing estimated numbers of up to 104 Salmonella organisms per sampled area (50 by 50 cm). Salmonella was found on 9.6% of 240 lamb carcasses, 12.7% of 330 beef carcasses, 31% of 70 pig carcasses, 20% of 80 calf carcasses younger than 14 days of age, and none of 330 cull cow and bull carcasses. Subtyping divided the 137 isolates into seven serogroups and three pulsed-field gel electrophoresis clusters, and sensitivity testing against a bank of 16 antimicrobials indicated that 47 isolates had resistance to one or more antimicrobial agents. These results indicate that Salmonella contamination can persist in the lairage environment from one processing day to the next and that Salmonella is present on red meat carcasses, although the implications of residual lairage contamination on carcass meat microbiology are not clear from this study. Abattoir owners should take steps to reduce the level of contamination in their premises to prevent contamination from being carried over from one processing day to the next.

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