• Korean Chemical Engineering Research
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• v.60 no.4
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• pp.519-524
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• 2022

Domestic building finishing materials are being evaluated according to KS F 2271 standards according to the notification of the Ministry of Land, Infrastructure and Transport, and this test is evaluated using laboratory animals. In this study, experiments were conducted on highly combustible organic insulation materials such as EPS, urethane, and phenolic foam. The purpose of this study was to analyze the cause of the behavioral suspension of the experimental mice by measuring the average behavioral suspension time of the mice caused by the harmful gas generated when these three types of insulation materials were burned. FTIR analysis and smoke density experiment were performed as a cause analysis method for the behavioral suspension of mice, and the experimental results were analyzed by dividing the causes of behavioral suspension into suffocation by particulate matter and toxic inhalation by gaseous substances. As a result of the test, urethane was evaluated as the most harmful insulation material, and as a result of FTIR analysis and smoke density test as a cause analysis for the gas toxicity test results, it is judged that the behavioral stop of the rats by suffocation is higher than the effect of toxic inhalation. This study is a basic study on the cause analysis of harmful gases, and it will be necessary to prepare the toxicity basis and analyze various materials and gases.

• Horticultural Science & Technology
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• v.30 no.1
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• pp.34-41
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• 2012

The study was conducted in a glasshouse to examine the possibility of producing paprika plug seedlings in a newly developed inert phenolic foam growing medium. Plug seedlings of 'Fascinato' paprika were grown in five media, Grodan rockwool (Grodan Co. Ltd., Denmark), UR rockwool (UR Co. Ltd., Korea), phenolic foam LC (Smithers Oasis Korea Co. Ltd., Korea), phenolic foam RC, and phenolic foam 3813-4 all in a pellet type. Seeds were germinated in a growth chamber ($25^{\circ}C$, 90% RH, dark) for 4-5 days and then seedlings were grown in a glasshouse with nutrient solution supplied by an overhead irrigation system. Seedling growths were measured 20 days after sowing. The medium pH was the highest in the Grodan rockwool, and medium EC was the highest in phenolic foam 3813-4, although no nutritional excess disorders were observed. Germination rates of paprika were higher than 90% in all the media. Plant height, stem diameter, T/R ratio, leaf area, and chlorophyll showed a similar to those in the rockwool medium. Number of leaves, length of the longest root and dry weights of shoot were not significantly different among treatments. Overall, phenolic foam LC and RC produced seedlings with a similar growth as the rockwool medium. The results obtained suggest that rockwool can be replaced with a new material such as phenolic foam in the commercial scale production of plug seedlings of 'Fascinato' paprika.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.44 no.4
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• pp.465-475
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• 2018

This study was carried out to evaluate the antioxidant, anti-inflammation, and tyrosinase inhibitory activity of Melissa officinalis extracts and their fractions. The total polyphenol contents of the extracts were 33.02-302.76 mg GAE/g and total flavonoid contents were 9.98-325.07 mg CE/g. In 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay, DPPH radical scavenging activity was observed in the extracts and water fractions of M. officinalis and similar to that of ascorbic acid ($30{\mu}M$). In addition, the treatment of chloroform fraction significantly inhibited the production of nitric oxide (NO) in RAW 264.7 cells, indicating that they have anti-inflammatory activity. Tyrosinase inhibitory activity of $200{\mu}g/mL$ of 100% ethanol reflux extract showed better inhibitory activity than arbutin treatment at statistically significant level. As a result, it is considered that M. officinalis can be used as an effective cosmetic ingredient having antioxidant, anti-inflammation, and whitening activity.