• Journal of the Korean Wood Science and Technology
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• v.48 no.5
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• pp.631-640
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• 2020

In this study, the effect of specimen size and layer thickness on the sound absorption of the leaves of two evergreen broad-leaved tree species, Dendropanax morbiferus and Fatsia japonica, was investigated. The specimen sizes of 0.5 × 0.5, 1.0 × 1.0, and 2.0 × 2.0 ㎠ and layer thicknesses of 1.00, 1.75, and 2.50 cm were considered. At the layer thickness of 2.5 cm, the leaf of the D. morbiferus showed no significant difference in sound absorption coefficients (SACs) as the sample size varied, however, a significant change in SACs was recorded in that of the F. japonica. At 1.0-cm thickness, the SACs of the F. japonica leaf varied more remarkably with the sample size. The 2.50-cm-thick F. japonica leaf with the specimen size 0.5 × 0.5 ㎠ exhibited the highest sound absorption effect among all samples investigated.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2011.11a
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• pp.33-33
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• 2011

Artificial silk that called "Ponggi (Gyeongsangbukdo, Korea) In-Gyeun" in Korea is entirely viscose rayon of which made main component refined larches and cotton linter. It also is natural fabrics with light weight, cool texture, free from the body and well ventilation property, so, feel good touch during the wearing. In addition, it often used as summer cloth and bedding because it has good absorbancy to perspiration and antistatic. The "Hanji", made of paper mulberry, is known as useful material for human. In this research focused on dyeability of Artificial silk/paper mulberry mixed fabrics using Dendropanax morbifera Lev.(called as "Hwangchil") Especially, the results were in comparison to the dyeing properties of Hwangchil with liquid/solid fermentation or not. As the results, The ${\Delta}E$ difference was dominated when the fabric dyed with fermentation by solid state at $60^{\circ}C$. And it was confirmed that the pH of fermented dye had an important influence in the coloration.

• Textile Coloration and Finishing
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• v.35 no.2
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• pp.67-81
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• 2023

This study aims to examine the possibility of using dried Dondropanax morbiferus extract as a functional dye. The leaves and branches of were extracted with distilled water and 30% ethanol, and the dyeability and functionality of silk fabrics were examined according to the color characteristics of the extract and dyeing conditions. As a result of analyzing the ultraviolet and visible light absorption spectrum of the extract, it was possible to confirm the peak of flavonoid belonging to polyphenol, and the peak of riboflavin expressing yellow color was confirmed. Adsorption equilibrium was observed at 4% dyeing concentration and 60 minutes of dyeing time, and as the temperature increased, dyeing amount increased without color change of Y-series. Aluminum mordanting also increased the yellow color. The color fastness of washing and UV irradiation was low, but the color fastness of rubbing was evaluated as relatively good. The silk fabric dyed with the distilled water extract of the leaves showed a 99.9% bacteriostatic reduction against Staphylococcus aureus and Klebsiella pneumoniae, showing excellent antibacterial properties.

• Journal of Life Science
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• v.29 no.1
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• pp.29-36
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• 2019

We investigated the fermentation conditions for extracts of leave/branches and sap from Korean Dendropanax morbifera (D. morbifera) using Lactobacillus plantarum (L. plantarum) ilchiwhangchil 1785 and L. plantarum ilchiwhangchil 2020. Log growth phase cultured L. plantarum ilchiwhangchil 1785 and L. plantarum ilchiwhangchil 2020 were used for fermentation. The pH and growth of the microorganisms in broth were monitored during the fermentation period. The results revealed that the optimum fermentation conditions for 20 wt% of leave/branches extracts and 1 wt% of sap extract was 2 days incubation at $37^{\circ}C$. The minimum inhibitory concentration (MIC) method and a disk diffusion assay were used to evaluate the antimicrobial activity of the fermented extracts of the leave/branches and sap against Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. The antimicrobial activity increased in all three strains grown on the medium containing fermented extracts of the leave/branches and sap as compared with that of the strains grown on medium containing non fermented extracts. Furthermore, the antimicrobial activity increased in proportion to the contents of the fermented extracts. Our data suggest that fermented extracts of leave/branches and sap of D. morbifera have applications as natural bio functional materials, such as preservatives, cosmetic materials, and natural packaging materials.

• Korean Journal of Food Science and Technology
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• v.48 no.3
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• pp.275-283
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• 2016

An anti-amnesic effect of water extract from Dendropanax morbifera Lev. leaves (DMW) on memory dysfunction in streptozotocin-induced diabetic rats was investigated to assess its potential industrial value. Daily administration of DMW (11 weeks) significantly reduced serum glucose, insulin, and blood urea nitrogen (BUN) levels increased by an intraperitoneal injection of streptozotocin (STZ, 55 mg/kg). In addition, the administration of DMW decreased escape latency and increased the time spent in the platform quadrant in the Morris water maze test. Step-through latency in a passive avoidance test was also improved. Finally, DMW produced ameliorating effects on STZ-induced cholinergic deficit through an inhibitory effect on acetylcholinesterase and the increment of acetylcholine level in the hippocampus. These results suggest that DMW might be used as a natural substance for improving diabetic induced cognitive impairment.

• Journal of the Korean Society of Food Science and Nutrition
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• v.44 no.5
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• pp.641-648
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• 2015

The purpose of this study was to determine the effects of dried Dendropanax morbifera leaf extracts on lipid profiles of mice fed a high-fat and -cholesterol diet (HFCD). ICR mice were divided into six groups based on mice fed AIN-93G diet (Normal), HFCD (Control), HFCD+100 mg/kg/d of D. morbifera leaf aqueous extract (DA-100), HFCD+200 mg/kg/d of D. morbifera leaf aqueous extract (DA-200), HFCD+100 mg/kg/d of D. morbifera leaf ethanol extract (DE-100), or HFCD+200 mg/kg/d of D. morbifera leaf ethanol extract (DE-200) for 7 weeks. The final body weights of mice fed D. morbifera extracts were all lower than those of the control group. Mice treated with D. morbifera extracts showed significantly reduced plasma and hepatic triglyceride (TG), total cholesterol (TC), and low-density lipoprotein cholesterol levels, along with increased plasma high-density lipoprotein cholesterol level. Fecal TG level was higher in DE-100 and DE-200 groups and TC level was significantly higher in the DA-200 and DE-200 groups. Relative liver weight, spleen weight, and testicle fat weight in mice treated with D. morbifera were reduced compared to the control group. Plasma insulin, aspartate transaminase, and alanine transaminase levels of experimental groups were also lower than those of the control group. All mice treated with D. morbifera extracts had lower malondialdehyde (MDA) content and higher superoxide dismutase (SOD) activity than the control group. Particularly MDA levels of the DA-200 and DE-200 groups and SOD levels of the DE-200 group were identical to levels of the normal group. These results suggest that D. morbifera extracts have lipid improvement effects in mice fed a HFCD.

• Korean Journal of Medicinal Crop Science
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• v.10 no.2
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• pp.109-115
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• 2002

The immune activation activities of ethanol, ethanol : water(1 : 1,v/v) and water extracts from Dendropanax morbifera Lev. were compared. The crude extracts showed relatively low cytotoxicity as less than 26% by using human normal liver cell(WRL-68). For example, the ethanol extract inhibited. in MCF7 and Hep3B cells in adding 1.0 mg/mL ethanol extracts. The growth of human immune T and B cells was enhanced up to $1.22{\sim}1.27$ times by adding the crude extracts. These are a trend of increasing secretion of $cytokines(IL-6,\;TNF-{\alpha})$ from human B/T cell for 6 day cultivation. It was found that the immune activation activities of the crude extracts seemed to be higher than those obtained by using other solvents.

• Korean Journal of Environmental Biology
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• v.17 no.2
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• pp.199-204
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• 1999

The effects of temperature stress and paraquat on the superoxide dismutase (SOD) activity and the photochemical efficiency of photosystem II were studied in the leaves of Araliaceae plants. The SOD activity of Acanthopanax koreanum leaf discs increased at 4$^{\circ}C$ and 28$^{\circ}C$, and increased significantly at 4$^{\circ}C$ ,28$^{\circ}C$ and 35$^{\circ}C$ in the presence of paraquat. However, the SOD activity of Dendropanax morbifera leaf discs decreased at 4$^{\circ}C$, 28$^{\circ}C$ and 35$^{\circ}C$ regardless of paraquat treatment. The photochemical efficiency of photosystem II, Fv/Fm, of leaf discs of A. koreanum and D. morbifera fell remarkably at 35$^{\circ}C$. In the presence of paraquat, the Ev/Fm values fell slightly at 4$^{\circ}C$ in A. koreanum leaf discs and at 35$^{\circ}C$, in D. morbifera leaf discs. These results indicate that A. koreanum plants are more resistant to temperature stress or oxidative stress than D. morbifera plants although their photochemical efficiency falls slightly at 4$^{\circ}C$ in the presence of paraquat.

• Journal of Adhesion and Interface
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• v.16 no.4
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• pp.146-151
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• 2015

Raw sap of essential oil in Korean Dendropanax lacquer was extracted with ethanol, and which was cured by using ROMP (ring opening metathesis polymerization, one of olefin metathesis). Curing behavior with subsequent film properties were studied and compared with conventional curing (under ambient conditions) and UV photo curing. The compositional changes of major ingredients in the lacquer before and after curing were studied by using GC-MS (gas chromatography mass spectrometry). ROMP-cured coating film showed higher gel contents (40%) as compared to those of conventional (8%) and UV curing (25%). ROMP curing with 2 wt% Grubbs' catalyst at $100^{\circ}C$ completed curing reaction within 2 h, which was much faster than that of conventional curing. The quality of coating film prepared with ROMP was more homogeneous and wrinkle-free as compared with that with UV curing. It was found that major ingredients of sesquiterpenes, such as ${\alpha}$-selinene, ${\beta}$-selinene, and ${\delta}$-cadinene were reacted in ROMP, as well as polyacetylenes.

• Journal of the Korean Society of Food Science and Nutrition
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• v.45 no.3
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• pp.372-379
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• 2016

This study was performed to investigate the quality characteristics of various salted (8, 10, and 12%) Doenjang prepared with fermented Hwangchil (Dendropanax morbifera) extract as well as the effect of Bacillus methylotrophicus S8 strain, isolated from soy sauce, as a starter culture. After fermentation, the total cell number of low-salted Doenjang (8% and 10%) prepared with fermented Hwangchil was lower than that of Doenjang without fermented Hwangchil. Low-salted Doenjang (8% and 10%) showed higher total acidity, amino acid, and organic acid levels as well lower pH levels than high-salted Doenjang (12%), indicating active fermentation. The highest levels of lactic acid (48.1 mg/L) and glutamic acid (549.0 mg/L) were observed in low-salted Doenjang (8%) fermented with B. methylotrophicus S8 strain. The low-salted Doenjang (8%) fermented with B. methylotrophicus S8 also showed the highest score in overall preference of sensory evaluation. These results indicate that Hwangchil extract fermented with B. methylotrophicus S8 can be used as a starter for making low-salted Doenjang, resulting in improved palatability, and inhibition of abnormal fermentation.