Bactericidal Effects against S. aureus and Physicochemical Properties of Plasma Activated Water stored at different temperatures

Non-buffered plasma-activated liquids such as water and saline have shown bactericidal effects. In the present study, we investigated the anti-bacterial efficacy and stability of plasma-activated water (PAW) and plasma-activated saline (PAS), generated using a high voltage dielectric barrier discharge system. This study compares the potential of non-buffered plasma-activated liquids (PAL) for the inactivation of Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) after storage of the solutions at five different temperatures for a storage time up to 18 months after their generation. The temperatures used were room temperature, 4 °C, −16 °C, −80 °C, −150 °C. Both PAW and PAS achieved 6 log reduction for both bacteria on the first day of their generation after 60 min contact time and they retained these effects after 18 months when stored at the lowest temperatures. Chemical analysis of PAL showed that plasma caused a drop in pH, generation of reactive oxygen species and nitrates, whereas no nitrites are detected in the system used. The concentrations of chemical species were affected by the storage at different temperatures and a thermocouple probe was used to investigate the freezing behaviour of the PAL.

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Bactericidal and physicochemical properties of plasma activated water stored at different temperatures

2016 IEEE International Conference on Plasma Science (ICOPS) ◽

10.1109/plasma.2016.7534291 ◽

2016 ◽

Author(s):

Ying Tian ◽

Kaile Wang ◽

Songjie Wu ◽

Ruonan Ma ◽

Qian Zhang ◽

...

Keyword(s):

Physicochemical Properties ◽

Different Temperatures ◽

Plasma Activated Water

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Changes of Physicochemical Properties of Starch Syrups Recommended for Winter Feeding of Honeybees during Storage

Agriculture ◽

10.3390/agriculture11040374 ◽

2021 ◽

Vol 11 (4) ◽

pp. 374

Author(s):

Teresa Szczęsna ◽

Ewa Waś ◽

Piotr Semkiw ◽

Piotr Skubida ◽

Katarzyna Jaśkiewicz ◽

...

Keyword(s):

Chemical Composition ◽

Physicochemical Properties ◽

Physicochemical Parameters ◽

Storage Temperature ◽

Storage Conditions ◽

Different Temperatures ◽

And Storage ◽

Bee Colonies ◽

Temperature Time ◽

Winter Feeding

The aim of this study was to determine the influence of storage temperature and time on physicochemical parameters of starch syrups recommended for the winter feeding of bee colonies. The studies included commercially available three starch syrups and an inverted saccharose syrup that were stored at different temperatures: ca. 20 °C, 10–14 °C, and ca. 4 °C. Physicochemical parameters of fresh syrups (immediately after purchase) and syrups after 3, 6, 9, 12, 15, 18, 21, and 24 months of storage at the abovementioned temperatures were measured. It was observed that the rate of unfavorable changes in chemical composition of starch syrups and the inverted saccharose syrup, mainly the changes in the 5-hydroxymethylfurfural (HMF) content, depended on the type of a syrup and storage conditions (temperature, time). Properties of tested starch syrups intended for winter feeding of bees stored at ca. 20 °C maintained unchanged for up to 6 months, whereas the same syrups stored at lower temperatures (10–14 °C) maintained unchanged physicochemical parameters for about 12 months. In higher temperatures, the HMF content increased. To date, the influence of this compound on bees has not been thoroughly investigated.

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Torrefaction of Almond and Walnut Byproducts

Frontiers in Energy Research ◽

10.3389/fenrg.2021.643306 ◽

2021 ◽

Vol 9 ◽

Author(s):

Zach McCaffrey ◽

Lennard Torres ◽

Bor-Sen Chiou ◽

Saulo Rocha Ferreira ◽

Luiz Eduardo Silva ◽

...

Keyword(s):

Physicochemical Properties ◽

Moisture Absorption ◽

Calorific Value ◽

Dynamic Vapor Sorption ◽

Energy Applications ◽

Thermochemical Process ◽

Heat Treated ◽

The Us ◽

Torrefied Biomass ◽

Different Temperatures

While the US nut industry is growing, markets for nut by-products, particularly nutshells and tree prunings, have not kept pace. Torrefaction is a thermochemical process used to improve physicochemical properties of biomass for energy and other applications. The goal of the paper was to characterize the effects of a range of torrefaction conditions on the properties of nut by-product feedstock. The process consists of thermal treatment of biomass at a temperature between 200 and 300°C in the absence of oxygen, where final material properties of the torrefied biomass depend on the temperature, heating rate, and residence time. In general, torrefied biomass exhibits higher hydrophobicity and calorific value with reduced moisture absorption compared to untreated biomass, making it an ideal fuel source for energy applications compared to raw biomass. In this study, almond shells of soft, semi-soft, and hardshell varieties, as well as walnut shells and almond wood, were torrefied at two different temperatures (230 and 290°C) and three different residence times (20, 40, and 60 min) in order to characterize the physicochemical properties. The thermal behavior of raw and heat-treated biomass was investigated by TGA analysis, elemental analysis, pH, helium pycnometry, FTIR spectroscopy, and dynamic vapor sorption analysis.

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Correlations of the physicochemical properties of organosolv lignins from Broussonetia papyrifera with their antioxidant activities

Sustainable Energy & Fuels ◽

10.1039/d0se00940g ◽

2020 ◽

Vol 4 (10) ◽

pp. 5114-5119

Author(s):

Lan Yao ◽

Long Xiong ◽

Chang Geun Yoo ◽

Chengyu Dong ◽

Xianzhi Meng ◽

...

Keyword(s):

Physicochemical Properties ◽

Antioxidant Activities ◽

Broussonetia Papyrifera ◽

Organosolv Pretreatment ◽

Different Temperatures ◽

Lignin Characteristics

To understand the influence of lignin characteristics on their antioxidant activities, lignins were isolated from Broussonetia papyrifera by organosolv pretreatment at different temperatures.

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