Long-term development of VOC emissions from OSB after hot-pressing

Holzforschung ◽  
2005 ◽  
Vol 59 (5) ◽  
pp. 519-523 ◽  
Author(s):  
Mathias Makowski ◽  
Martin Ohlmeyer ◽  
Dietrich Meier
Keyword(s):  
Hot Pressing ◽  
Unsaturated Fatty Acids ◽  
Oriented Strand Board ◽  
Wood Properties ◽  
Storage Conditions ◽  
Test Results ◽  
Voc Emissions ◽  
Volatile Organic ◽  
And Storage

Abstract An oriented strand board (OSB) made of Scots pine (Pinus sylvestris L.) was tested for volatile organic compound (VOC) emissions 24 h after the hot-pressing process over a period of 2 months. The predominant emissions from the OSB were monoterpenes and aldehydes. Terpene emissions decreased continuously, whereas aldehyde concentrations initially increased and subsequently decayed. Aldehydes are formed by the autoxidative splitting of unsaturated fatty acids contained in the wood. Due to the delayed release of aldehydes, a comparison of different emission test results is only possible if age and storage conditions are clearly specified. For a reduction in VOC emissions from wood-based materials, wood properties, manufacturing process, and storage conditions have to be considered.

Influences of hot pressing temperature and surface structure on VOC emissions from OSB made of Scots pine

Holzforschung ◽  
2006 ◽  
Vol 60 (5) ◽  
pp. 533-538 ◽  
Author(s):  
Mathias Makowski ◽  
Martin Ohlmeyer
Keyword(s):  
Surface Structure ◽  
Scots Pine ◽  
Hot Pressing ◽  
Fine Particles ◽  
Oriented Strand Board ◽  
Pressing Temperature ◽  
Voc Emissions ◽  
Emission Testing ◽  
Volatile Organic ◽  
Manufacturing Parameters

Abstract Oriented strand board (OSB) made of Scots pine (Pinus sylvestris L.) releases high amounts of terpenes and aldehydes. These volatile organic compound (VOC) emissions are clearly affected by the manufacturing parameters. As a consequence of high temperatures during hot pressing, terpene emissions from OSB are reduced. Aldehyde emissions are initially lowered after pressing at a high temperature (260°C). Furthermore, emissions are influenced by the surface structure. If the surface consists of fine particles, terpene emissions are lowered and the course of aldehyde formation is altered. Nevertheless, a reduction in VOC emissions by adjustment of the parameters investigated in this work seems to be restricted to terpenes. Aldehyde emissions from all panels converge during emission testing and in the final stages no clear distinction is possible according to the pressing temperature or surface structure.

Should phosphatidylethanol be currently analysed using whole blood, dried blood spots or both?

2019 ◽  
Vol 57 (5) ◽  
pp. 617-622 ◽  
Author(s):  
Van Long Nguyen ◽  
Michael Fitzpatrick
Keyword(s):  
Whole Blood ◽  
Blood Cells ◽  
Dried Blood Spots ◽  
Storage Conditions ◽  
Ethanol Metabolism ◽  
Clinical Use ◽  
Blood Spots ◽  
Comparative Review ◽  
And Storage

Abstract Phosphatidylethanol (PEth) are phospholipids produced through non-oxidative ethanol metabolism. They accumulate in red blood cells and have been traditionally analysed in whole blood as potential biomarkers for moderate to long-term alcohol consumption. More recently, their analysis in dried blood spots has been gaining favour, namely, due to the ease in sampling, transport and storage conditions required. This paper aims at providing a short comparative review between analysing PEth in whole blood and dried blood spots and the potential pitfalls that researchers may face when setting up PEth testing for clinical use.

scholarly journals Preservation of Azotobacter chroococcum vegetative cells in dry polymers

2014 ◽  
Vol 20 (2) ◽  
pp. 201 ◽  
Author(s):  
Daniel Rojas-Tapias ◽  
Oriana Ortega Sierra ◽  
Diego Rivera Botía ◽  
Ruth Bonilla
Keyword(s):  
Storage Conditions ◽  
Azotobacter Chroococcum ◽  
Bacterial Degradation ◽  
Protective Agent ◽  
Degradation Rates ◽  
Different Temperatures ◽  
And Storage ◽  
Temperature Time ◽  
Long Term Preservation

We studied the preservation of Azotobacter chroococcum C26 using three dry polymers: carrageenin, sodium alginate, and HPMC, using a method of accelerated degradation. Bacterial viability, as response variable, was measured at three temperatures in four different times, which was followed by calculation of bacterial degradation rates. Results showed that temperature, time of storage, and protective agent influenced both viability and degradation rates (P;lt;0.05). We observed, using the Arrhenius thermodynamic model, that the use of polymers increased the activation energy of bacterial degradation compared to control. We obtained thermodynamic models for each polymer, based on the Arrhenius equation, which predicted the required time for thermal degradation of the cells at different temperatures. Analysis of the models showed that carrageenin was the best polymer to preserve A. chroococcum C26 since ~ 900 days are required at 4 ºC to reduce its viability in two log units. We conclude, therefore, that long-term preservation of A. chroococcum C26 using dry polymers is suitable under adequate preservation and storage conditions.

scholarly journals ANTIOXIDANT PROPERTIES AND FRUIT QUALITY DURING LONG-TERM STORAGE OF “ROCHA” PEAR: EFFECTS OF MATURITY AND STORAGE CONDITIONS

2010 ◽  
Vol 33 (1) ◽  
pp. 1-20 ◽  
Author(s):  
FILIPE J.P. SILVA ◽  
MARIA HELENA GOMES ◽  
FERNANDA FIDALGO ◽  
JOSÉ A. RODRIGUES ◽  
DOMINGOS P.F. ALMEIDA
Keyword(s):  
Fruit Quality ◽  
Antioxidant Properties ◽  
Storage Conditions ◽  
Long Term Storage ◽  
And Storage ◽  
Term Storage

scholarly journals Long-term VOC emissions emitted by furniture parts

2007 ◽  
Vol 55 (1) ◽  
pp. 65-70
Author(s):  
Zdeněk Jergl
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Human Body ◽  
Working Environment ◽  
Surface Finishing ◽  
Voc Emissions ◽  
Volatile Organic ◽  
Qualitative Determination

The contribution refers to the problems of long-lasting emissions of VOC (volatile organic compounds) emitted from surface finishing furniture components. Furniture is one of the sources of VOC (volatile organic compounds) in living and working environment. By long-lasting affecting on a human body, higher emission concentrations of VOC in interior can cause health problems.Time is a significant factor influencing the number of VOC (volatile organic compounds) emitted from surface finishing furniture components. The number of long-term emissions was examined in particular phases of production of furniture components.The comparison was focused on a difference in surface finishing of furniture components with water-diluted materials and solvent lacquer materials.The compound of water-diluted materials and solvent lacquer materials has an effect of a quantity of emitted VOC.The quantitative and qualitative determination of VOC emissions from lacquer materials is the result of the carried out analyses.

CHARACTERISTICS OF NORSODYNE AS PLASTINATION AGENT

2019 ◽  
Vol 17 (Suppl. 2) ◽  
pp. 4-6
Author(s):  
A. Georgieva ◽  
J. Stoyanov ◽  
N. Tsandev ◽  
D. Sivrev
Keyword(s):  
Storage Temperature ◽  
Unsaturated Polyester ◽  
Specific Weight ◽  
Storage Conditions ◽  
Test Method ◽  
Test Results ◽  
Long Term Storage ◽  
New Material ◽  
Higher Temperature

Background: Norsodyne is a new material for conservation and durable preservation of biological objects. The form we use is H 13212 TAE (Polynt Composites USA, Inc., Bergamo, Italy). This is an unsaturated polyester resin in styrene that is of low styrene emission. Features: resin has a specific weight 1.10 g/cm2 at 20°C. Using test method MT-CUT23V the manufacturer has established that Brookfield viscosity at 23°C is 450-650 mPa.s. The jelly starts in 14-18 minutes and reaches its peak in 27-37 minutes at 23°C too. Acording to the test results of ISO 527 (2012) tensile strength of Norsodyne is 57 MPa and flexural strength is 98 MPa (ISO 178 (2011). Conclusion: This characteristic of Norsodyne indicates that the material can be used for the preservation and long-term storage of anatomical preparations for the needs of anatomy training. However, the Norsodyne needs special storage conditions. The material should be stored in a dark place. According to the manufacturer shelf life at 23°C in the dark is six months then spontaneous rubbing begins. The manufacturer's recommendations are: Store in the shade, out of direct sunlight. Keep storage temperature below 25°C. Unseal container just before use. Shelflife will be reduced reaching higher temperature.

Response of Longleaf Pine Seeds to Storage Conditions and Pregermination Treatments

1993 ◽  
Vol 17 (4) ◽  
pp. 174-179 ◽  
Author(s):  
James P. Barnett ◽  
John P. Jones
Keyword(s):  
Seed Quality ◽  
Longleaf Pine ◽  
Pinus Palustris ◽  
Storage Conditions ◽  
Operational Conditions ◽  
Long Term Storage ◽  
Processing And Storage ◽  
And Storage ◽  
Term Storage

Abstract Although longleaf pine (Pinus palustris Mill.) seeds are considered the most susceptible of the southern pines to damage during collection, processing, and storage, results of these studies show that high seed quality can be assured for periods up to 20 yr through proper handling and storing techniques. Recommendations for long-term storage include drying seeds to moisture contents of 10% or less and storing at subfreezing temperatures, preferably near 0°F. Reevaluation of stratification treatments applied under operational conditions indicates that the soaking in water that is necessary for seed imbibition reduces total germination in an amount proportional to the length of the soak. Stratification is not recommended except under very controlled conditions. South. J. Appl. For. 17(4):174-179.

scholarly journals Low-moisture food matrices as probiotic carriers

2019 ◽  
Vol 366 (Supplement_1) ◽  
pp. i49-i59
Author(s):  
Martín Sebastián Marcial-Coba ◽  
Susanne Knøchel ◽  
Dennis Sandris Nielsen
Keyword(s):  
Storage Conditions ◽  
Factors Associated ◽  
Desiccation Process ◽  
The Matrix ◽  
Food Matrices ◽  
Near Future ◽  
And Storage ◽  
Upper Gastrointestinal ◽  
Selection Of

ABSTRACT To exert a beneficial effect on the host, adequate doses of probiotics must be administered and maintaining their viability until consumption is thus essential. Dehydrated probiotics exhibit enhanced long-term viability and can be incorporated into low-moisture food matrices, which also possess high stability at refrigeration and ambient temperature. However, several factors associated with the desiccation process, the physicochemical properties of the matrix and the storage conditions can affect probiotic survival. In the near future, an increased demand for probiotics based on functionally dominant members of the gut microbiome (‘next-generation probiotics’, NGP) is expected. NGPs are very sensitive to oxygen and efficient encapsulation protocols are needed. Strategies to improve the viability of traditional probiotics and particularly of NGPs involve the selection of a suitable carrier as well as proper desiccation and protection techniques. Dehydrated probiotic microcapsules may constitute an alternative to improve the microbial viability during not only storage but also upper gastrointestinal tract passage. Here we review the main dehydration techniques that are applied in the industry as well as the potential stresses associated with the desiccation process and storage. Finally, low- or intermediate-moisture food matrices suitable as carriers of traditional as well as NGPs will be discussed.

scholarly journals Environment is crucial to the cooking time of beans

2012 ◽  
Vol 32 (3) ◽  
pp. 573-578 ◽  
Author(s):  
Bruna Arruda ◽  
Altamir Frederico Guidolin ◽  
Jefferson Luís Meirelles Coimbra ◽  
Jaqueline Battilana
Keyword(s):  
Storage Time ◽  
Storage Condition ◽  
Storage Conditions ◽  
Cooking Time ◽  
Dependent Manner ◽  
Simple Linear Regression ◽  
Long Term Storage ◽  
And Storage ◽  
Term Storage

The objectives of this study were to understand how genotype, storage time, and storage conditions affect cooking time of beans and to indicate storage techniques that do not affect the cooking time. The grains were subjected to five different storage periods and six different storage conditions. The cooking time was estimated using the Mattson Cooker. The data were subjected to analysis of variance and a subsequent adjustment of simple linear regression for deployment of the interactions between the factors. Contrasts were used to determine the best levels of the factor storage condition. Genotype did not impact cooking time when the storage time and storage conditions were considered. Time and storage conditions affect the cooking time of beans in a dependent manner, but time of storage had the biggest influence. The best conditions for long-term storage of beans ensuring a smaller increase in cooking time is plastic storage at low temperatures. Thus, plastic freezer storage is a practical alternative for consumers.

scholarly journals Measurable Cytokine Concentrations in Pig Seminal Plasma Are Modified by Semen Handling and Storage

Biology ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 276
Author(s):  
Lorena Padilla ◽  
Isabel Barranco ◽  
Inmaculada Parrilla ◽  
Xiomara Lucas ◽  
Heriberto Rodriguez-Martinez ◽  
...  
Keyword(s):  
Seminal Plasma ◽  
Biological Fluids ◽  
Storage Conditions ◽  
Reliable Measurement ◽  
Short Term ◽  
Gm Csf ◽  
Long Term Storage ◽  
And Storage ◽  
Term Storage

Sample handling and storing are critical steps for the reliable measurement of circulating biomolecules in biological fluids. This study evaluates how cytokine measurements in pig seminal plasma (SP) vary depending on semen handling and SP storage. Thirteen cytokines (GM-CSF, IFNγ, IL-1α, IL-1β, IL-1ra, IL-2, IL-4, IL-6, IL-8, IL-10, IL-12, IL-18 and TNFα) were measured using Luminex xMAP® technology in individual seminal plasma (SP) samples (n = 62) from healthy breeding boars. Three separate experiments explored the delay (2 h and 24 h) in SP collection after ejaculation (Experiment 1) and SP storage, either short-term (5 °C, −20 °C and −80 °C for 72 h, Experiment 2) or long-term (at −20 °C and −80 °C for two months, Experiment 3), before analysis. Levels in fresh SP-samples were used as baseline control values. Delays in SP harvesting of up to 24 h did not substantially impact SP cytokine measurements. Some cytokines showed instability in stored SP samples, mainly in long-term storage. Ideally, cytokines in pig SP should be measured in fresh samples harvested within 24 h after ejaculation. If storage of SP is imperative, storage conditions should be adjusted for each cytokine.

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