Emission Characteristics of Volatile Organic Compounds by Humidifier with Using Hinoki Cypress Extracts

이민,; 박상범,; 이상민,; 이희영,; 길덕한,

doi:10.5658/wood.2014.42.6.747

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…Modern people are exposed to indoor pollutants as the indoor living time increases (Lee, et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Prediction of Indoor Radon Concentration through the Exhalation from Korean Yellow Residual Soil, Hwangtoh as a Building Material

Lee¹,

강석구²

2021

Journal of the Korean Wood Science and Technology

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The radon gas from nature mainly considers a cause of radon problems, and it is closely affect human life cycle. Korean yellow residual soil, Hwangtoh, widely used as a building material, is considered to be one of major sources of indoor radon. However, there have, as yet, been no studies about radon from Hwangtoh in mass market brands. Here, we investigated the indoor radon concentrations and exhalation rates in four Hwangtohs from different brand names and regional features. The Closed Chamber Method (CCM) conducted by a Continuous Radon Monitor (CRM) has been used for the rates of radon exhalation. Based on equations of previous references, the indoor radon concentrations were deducted. As a result, the radon surface exhalation rates resulted in the 1.4208 to 3.0293 Bq•m 2 •h -1 range. Significant differences were found among Hwangtohs according to production regions. Materials with higher radon concentration required a longer time to reach a quasi-steady state in a given environment, in other words, the number of half-life cycles increased from a set starting point. The experimentally identified Hwangtohs demonstrated its safety for construction purposes. There exists, so far, a possibility to exert influence radon emanation due to unidentified factors. Therefore, it is necessary to corroborate with more research by increasing the number of Hwangtohs, considering the other references reported high radon exhalation rates. In addition, it is highly recommended that the radon exhalation rates should be measured for all building materials for preventing human health before the material usage.

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“…Modern people are exposed to indoor pollutants as the indoor living time increases (Lee, et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Prediction of Indoor Radon Concentration through the Exhalation from Korean Yellow Residual Soil, Hwangtoh as a Building Material

Lee¹,

강석구²

2021

Journal of the Korean Wood Science and Technology

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“…et Zucc.) was first introduced from Japan in 1904, it has been planted in the southern area as an economic species, and it has continuously been cultivated by national projects to develop more green areas (Lee et al, 2014). Cypress timber is considered high-quality wood with a unique scent; thus, it is widely used in architecture and manufacture of high-end furniture.…”

Section: Introductionmentioning

confidence: 99%

Anti-Inflammatory Effect of Essential Oils Extracted from Wood of Four Coniferous Tree Species

Yang¹,

Choi²,

Kim³

et al. 2019

Journal of the Korean Wood Science and Technology

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The aim of this study was to evaluate the anti-inflammatory effects of essential oils extracted from the wood of Chamaecyparis obtusa, Pinus densiflora, Pinus koraiensis, and Larix kaempferi. Essential oils were extracted by hydrodistillation, and their chemical components were determined by GC/MS. Major chemical components of these essential oils were α-cadinol (19.25%), τ-muurolol (14.20%), and α-pinene (13.74%) in C. obtusa; α-pinene (47.16%), longifolene (14.31%), β-phellandrene (11.78%), and β-pinene (11.02%) in P. densiflora; α-pinene (13.49%) and longifolene (10.79%) in P. koraiensis, and geranyl linalool (23.58%) and α-pinene (18.57%) in L. kaempferi. To evaluate the anti-inflammatory effects of essential oils, lipopolysaccharide (LPS)-induced RBL-2H3 mast cells were treated with these essential oils; then, the changes in the mRNA expression level of the cytokines IL-4 and IL-13 were examined. Further, degranulation was evaluated by measuring β-hexosaminidase release. After LPS-induced RBL-2H3 mast cells were exposed to 10 −7 % of all types of essential oils, the gene expression levels of IL-4 and IL-13 within the cells remarkably decreased. The relative mRNA expression level of IL-4 was 69.6% in P. densiflora, 63.2% in P. koraiensis, 55.1% in C. obtusa, and 45.8% in L. kaempferi compared with that in the group treated with LPS. The mRNA expression level of L-13 should a similar trend. The inhibitory rate of IL-13 mRNA expression of P. densiflora, P. koraiensis, C. obtusa, and L. kaempferi was 57.8%, 57.1%, 51.1%, and 34.5%, respectively. β-Hexosaminidase release significantly decreased following the treatment with the four types of essential oils. The rate of β-hexosaminidase release were 38.1% C. obtusa; 33.0% P. densiflora; 27.4% P. koraiensis; and 9.1% L. kaempferi. Among all types of essential oils, that extracted from P. densiflora wood showed the highest anti-inflammatory activity. These results show that the tested essential oils exert an anti-inflammatory effect through the inhibition of degranulation and expression of cytokines.

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Using a simple spectrophotometer to analyze cypress hydrolat composition

Yen

Chen

Chien

et al. 2021

MBE

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<abstract> <p>The Pure Dew (Cypress Hydrolat), which could be extracted from the waste material after the extracting essential oil from Taiwan cypress, has a good bactericidal effect. However, due to the high cost on quality control and concentration measurement of the Pure Dew, its application was restricted. This research tries to find suitable spectral frequencies through which the absorbance detected by the spectrometer could be used as the index of the pure dew concentration. This study used Gas Chromatography-Mass Spectrophotometer (GC-MS) to analyze the composition of Taiwan cypress hydrolat. After obtaining the composition, the raw liquor of cypress hydrolat was diluted to 100, 50, 25 and 0% v/v with pure water. The test samples were then tested by a simple spectrophotometer. After the spectrographic detection of absorbance using a simple spectrophotometer, it is confirmed that the spectrum of wavelength between 205–350 nm is the most representative. The absorptance and the pure dew concentration was roughly in linear relation which suggested that a simple spectrophotometer can be used to develop a low-cost and high.</p> </abstract>

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Emission Characteristics of Volatile Organic Compounds by Humidifier with Using Hinoki Cypress Extracts

Cited by 4 publications

References 15 publications

Prediction of Indoor Radon Concentration through the Exhalation from Korean Yellow Residual Soil, Hwangtoh as a Building Material

Prediction of Indoor Radon Concentration through the Exhalation from Korean Yellow Residual Soil, Hwangtoh as a Building Material

Anti-Inflammatory Effect of Essential Oils Extracted from Wood of Four Coniferous Tree Species

Using a simple spectrophotometer to analyze cypress hydrolat composition

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