scholarly journals Inactivation of Microbial Food Contamination of Plastic Cups Using Nonthermal Plasma and Hydrogen Peroxide

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Tereza Kordová ◽  
Vladimír Scholtz ◽  
Josef Khun ◽  
Hana Soušková ◽  
Pavel Hozák ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Food Contamination ◽  
Nonthermal Plasma ◽  
Cylindrical Container ◽  
Suitable Alternative ◽  
Airborne Contamination ◽  
Inner Surface ◽  
Total Elimination ◽  
Inactivation Effect

The inactivation effect of the combination of nonthermal plasma and hydrogen peroxide aerosol for the microbial decontamination of inner surface of cylindrical container buckets is studied on one bacterial and seven filamentous micromycete species and on airborne-contaminated cups. While the decontamination by single nonthermal plasma or hydrogen peroxide is not observable after 120 s, the strong decontamination by their combination occurs after 30 s of exposure. Moreover, observed total elimination of airborne contamination of plastic cups predetermines this method as a suitable alternative to the currently used method based on the application of hydrogen peroxide.

Combined Treatment with Hydrogen Peroxide and Ultra-violet Irradiation to Reduce Microbial Contamination Levels in Pre-formed Food Packaging Cartons

1983 ◽  
Vol 46 (12) ◽  
pp. 1060-1064 ◽  
Author(s):  
CATHERINE J. STANNARD ◽  
JOHN S. ABBISS ◽  
JOHN M. WOOD
Keyword(s):  
Hydrogen Peroxide ◽  
Food Packaging ◽  
Microbial Contamination ◽  
Combined Treatment ◽  
Ultra Violet ◽  
Lethal Effect ◽  
Low Concentrations ◽  
Inner Surface ◽  
Contamination Levels ◽  
Uv C

A treatment combining hydrogen peroxide and ultra-violet (UV-C) irradiation was assessed for reduction of microbial contamination in pre-formed food packaging cartons. There was a synergistic effect between low concentrations (0 – 5% wt/vol) of hydrogen peroxide and UV-C irradiation (10 s) on spores of Bacillus subtilis, the maximum lethality occurring between 0.5 and 1% peroxide. A combined treatment using 1% hydrogen peroxide and 10 s of UV-C irradiation was also effective against a variety of other organisms (spores and vegetative cells). The efficiency of the treatment was dependent on the type of inner surface of the carton. A greater lethal effect was obtained against B. subtilis spores in polyethylene-lined cartons than in aluminium/polyethylene laminate-lined cartons (5.1 and 3.5 decimal reductions in numbers respectively, using a combined treatment with 1% peroxide and 10 s of UV-C).

scholarly journals Hydroxyl Radicals and Hydrogen Peroxide Formation at Nonthermal Plasma–Water Interface

2016 ◽  
Vol 44 (10) ◽  
pp. 2084-2091 ◽  
Author(s):  
Yi Yi Zhao ◽  
Tao Wang ◽  
Mark P. Wilson ◽  
Scott J. MacGregor ◽  
Igor V. Timoshkin ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radicals ◽  
Nonthermal Plasma ◽  
Water Interface ◽  
Peroxide Formation ◽  
Hydrogen Peroxide Formation

Tooth Bleaching Using Low Concentrations of Hydrogen Peroxide in the Presence of a Nonthermal Plasma Jet

2013 ◽  
Vol 41 (2) ◽  
pp. 325-329 ◽  
Author(s):  
Jie Pan ◽  
Xiaohui Yang ◽  
Ke Sun ◽  
Jing Wang ◽  
Peng Sun ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Nonthermal Plasma ◽  
Plasma Jet ◽  
Tooth Bleaching ◽  
Low Concentrations

Decreasing Airborne Contamination Levels in High-Risk Hospital Areas Using a Novel Mobile Air-Treatment Unit

2007 ◽  
Vol 28 (10) ◽  
pp. 1181-1186 ◽  
Author(s):  
V. Bergeron ◽  
G. Reboux ◽  
J. L. Poirot ◽  
N. Laudinet
Keyword(s):  
High Risk ◽  
Operating Room ◽  
High Efficiency ◽  
Nonthermal Plasma ◽  
Fungal Species ◽  
Airborne Particles ◽  
Treatment Unit ◽  
Air Treatment ◽  
Hospital Environments ◽  
Airborne Contamination

Objective.To evaluate the performance of a new mobile air-treatment unit that uses nonthermal-plasma reactors for lowering the airborne bioburden in critical hospital environments and reducing the risk of nosocomial infection due to opportunistic airborne pathogens, such asAspergillus fumigatus.Methods.Tests were conducted in 2 different high-risk hospital areas: an operating room under simulated conditions and rooms hosting patients in a pediatric hematology ward. Operating room testing provided performance evaluations of removal rates for airborne contamination (ie, particles larger than 0.5μm) and overall lowering of the airborne bioburden (ie, colony-forming units of total mesophilic flora and fungal flora per cubic meter of air). In the hematology service, opportunistic and nonpathogenic airborne fungal levels in a patient's room equipped with an air-treatment unit were compared to those in a control room.Results.In an operating room with a volume of 118 m3, the time required to lower the concentration of airborne particles larger than 0.5μm by 90% was decreased from 12 minutes with the existing high-efficiency particulate air filtration system to less than 2 minutes with the units tested, with a 2-log decrease in the steady-state levels of such particles (P<.01). Concurrently, total airborne mesophilic flora concentrations dropped by a factor of 2, and the concentrations of fungal species were reduced to undetectable levels (P<.01). The 12-day test period in the hematology ward revealed a significant reduction in airborne fungus levels (P<.01), with average reductions of 75% for opportunistic species and 82% for nonpathogenic species.Conclusion.Our data indicate that the mobile, nonthermal-plasma air treatment unit tested in this study can rapidly reduce the levels of airborne particles and significantly lower the airborne bioburden in high-risk hospital environments.

scholarly journals Study of the influence of deliberately applied mechanical damage to cans of peach in syrup on the development of internal corrosion

2012 ◽  
Vol 15 (4) ◽  
pp. 325-332
Author(s):  
Sílvia Tondella Dantas ◽  
Elisabete Segantini Saron ◽  
Paulo Henrique Massaharu Kiyataka ◽  
Beatriz Maria Curtio Soares ◽  
Jozeti Aparecida Barbutti Gatti ◽  
...  
Keyword(s):  
Product Quality ◽  
Food Packaging ◽  
Mechanical Damage ◽  
Food Contamination ◽  
Storage Period ◽  
Storage Test ◽  
Internal Corrosion ◽  
Vacuum Level ◽  
Inner Surface ◽  
The Needy

The influence of damage to metal cans may result in an increase in the food/packaging interactions, resulting in food contamination by the metal present in the package. To simulate these reactions, three conditions of mechanical damage were introduced to metal cans of peaches in syrup in a controlled manner, to determine the evolution of the degree of internal oxidation of these cans as compared to undamaged cans, and to evaluate the possibility of exploiting the contents for consumption by the needy. The cans were classified according to the degree of damage and evaluated by a storage test for a period of 365 days under controlled temperature conditions, 35 °C ± 2 °C, with periodic evaluations of the visual internal appearance of the cans, the chromium, tin and iron concentrations in the product and the internal vacuum level of the can. During the storage period there was a reduction in internal vacuum, but the evaluations of the product showed there was no significant change in dissolution of the metals from the cans into the product, which remained in acceptable conditions, as also the appearance of the inner surface of the can. The study concluded that the damage to the cans of peaches in syrup did not lead to any major changes in product quality, regarding dissolution of the metals iron, tin and chromium.

Hydrogen-Peroxide-Enhanced Nonthermal Plasma Effluent for Biomedical Applications

2012 ◽  
Vol 40 (8) ◽  
pp. 1984-1991 ◽  
Author(s):  
Marek Golkowski ◽  
Czesław Golkowski ◽  
Jori Leszczynski ◽  
S. Reed Plimpton ◽  
Piotr Maslowski ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Biomedical Applications ◽  
Nonthermal Plasma

Photocatalytic oxidation of dichlorvos in the presence of hydrogen peroxide and ferrous ion

1994 ◽  
Vol 30 (9) ◽  
pp. 29-38 ◽  
Author(s):  
Ming-Chun Lu ◽  
Gwo-Dong Roam ◽  
Jong-Nan Chen ◽  
Chin-Pao Huang
Keyword(s):  
Hydrogen Peroxide ◽  
Quantum Yield ◽  
Hydroxyl Radical ◽  
Light Source ◽  
Photocatalytic Oxidation ◽  
Ferrous Ion ◽  
Ferrous Ions ◽  
Net Production ◽  
Inner Surface ◽  
Fixed System

The photocatalytic oxidation of dichlorvos has been investigated with two different reactors. The reactor using 254 nm light is a system with TiO2 suspensions. The 360 nm light is used as the light source of the fixed system which was TiO2 coated on the inner surface of the reactor. In terms of quantum yield, the 254 nm radiation is more effective for dichlorvos oxidation than the 360 nm light. The effect of H2O2 on dichlorvos oxidation shows a negative performance. The influence of H2O2 on the photocatalytic oxidation of dichlorvos is greater in the fixed system than that in the suspension system. The ferrous ions can induce the photo-Fenton-type reaction. However, the photocatalytic oxidation of dichlorvos will be inhibited slightly at the concentration of 1.0 × 10−5 M Fe+2. This result is explained in terms of the net production of hydroxyl radical.

Effects of iodate, hydrogen peroxide and dichromate on the denaturation of whey proteins in heated milk

1986 ◽  
Vol 53 (1) ◽  
pp. 89-95 ◽  
Author(s):  
Richard J. Marshall
Keyword(s):  
Hydrogen Peroxide ◽  
High Temperature ◽  
Protective Effect ◽  
Whey Protein ◽  
Protein Denaturation ◽  
Whey Proteins ◽  
Raw Milk ◽  
Suitable Alternative ◽  
Oxidizing Agents ◽  
Heated Milk

SUMMARYThe effect of heating raw milk at 75 °C for 30 min and at 95 °C for 15 s in the presence of varying concentrations of three oxidizing agents on the denaturation of total and individual whey proteins was measured. At 75 °C, ±-lactalbumin could be protected against denaturation by both iodate and H202 and ²-Lactoglobulins A and B by H202 and dichromate. However, at concentrations above ∼ 15 MM, the oxidizing agents tended to increase denaturation. At 95 °C, where the extent of whey protein denaturation was much reduced in the absence of oxidizing agents, little or no protective effect was observed. It is suggested that H202 may prove a suitable alternative to iodate in reducing deposits in ultra high temperature plants.

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