• Journal of the Korean Wood Science and Technology
• /
• 제31권1호
• /
• pp.16-21
• /
• 2003

느릅나무 근피의 메탄올 추출물을 분획하여 항균성을 측정한 결과 항균력이 가장 우수한 수용성 분획을 silicagel column chromatograpy 및 TLC에 의해 분리·정제한 다음 정제 화합물을 UV, IR, ¹H-NMR, ¹³C-NMR를 사용하여 구조를 동정하고 그 화합물의 항균력을 검정하였다. 수용성 분획물로부터 두 종류의 정제 화합물을 단리하였다. 기기분석 결과, 화합물 B는 Catechin rhamnoside로 확인되었다. 단리된 정제화합물은 Staphylococcus aureus 및 Salmonella typhimurium에 대하여 항균활성을 나타내었다.

• Journal of the Korean Wood Science and Technology
• /
• 제30권1호
• /
• pp.56-62
• /
• 2002

분버들 수피를 아세톤-물(7:3)로 추출한 후 농축하고 헥산, 클로로포름, 에틸아세테이트 및 수용성으로 분획하여 동결건조하였다. 각 추출물은 메탄올 수용액 및 에탄올-헥산 혼합액을 사용하여 Sephadex LH-20 칼럼크로마토그래피로 화합물을 분리한 후 TBA 및 6% 초산에 전개하는 셀룰로오스 박층크로마토그래피로 단리물질을 확인하였다. 단리물질의 화학적 구조는 ¹H-NMR, ¹³C-NMR 및 질량 분석으로 결정하였으며, 단일의 화합물로 정제된 물질은 flavonoid와 그 배당체 화합물인 (+)-catechin, naringenin, salipurposide, aromadendrin, isosalipurposide, aromadendrin-7-O-𝛽-D-glucopvranoside 및 taxifolin-7-O-𝛽-D-glucopy- ranoside였다.

• Journal of Forest and Environmental Science
• /
• 제31권4호
• /
• pp.297-302
• /
• 2015

With the intention to solve environmental problems caused by synthetic plastics from petroleum resources, biodegradable polyurethane foams and thermosetting moldings were prepared from biomass, such as wood and wheat bran by liquefaction method. Biodegradability of these biomass-based polymeric materials was investigated. In activated sludge, polyurethane foams from liquefied wheat bran and thermosetting molding from phenolated wood were decomposed approximately 14% and 29% for 20 days, respectively. One of the wood fungi, Coriolus versicolor was able to grow without supplemental nutrition, only with distilled water and polyurethane foam as a nutrition source. Risk assessments were also conducted and results showed that estrogenicity, mutagenicity, and carcinogenicity were not observed in the extractives of biomass- based polymeric materials.

• Journal of the Korean Wood Science and Technology
• /
• 제14권3호
• /
• pp.30-35
• /
• 1986

To elucidate chemical structure of the wood extracitives, softwood Larix leplolepis Gorden) metal was extracted with 95% ethanol at room temperature for 72 hours. The extract was fractionated with organic solvents such as n-hexane, chloroform. ether, and ethylacetate. From the n-hexane soluble fraction of the extratives, flavonoid and sterol compounds were isolated and identified as taxifolin(5,7,3',4'-tetrahydroxyflavanonol)(I) and ${\beta}$-sitosterol(II) by UV, IR, $^1$H-NMR spectroscopy and Mass spectrometry.

• Journal of the Korean Wood Science and Technology
• /
• 제28권4호
• /
• pp.25-28
• /
• 2000

Two flavan 3,4-diol derivatives were isolated from the heartwood of Robinia pseudoacacia and characterized by spectroscopic methods including $^1H$ and $^{13}C$ NMR and positive FAB-MS. The structures were identified as 2,3-trans-3,4-cis-3,4,7,3',4',5'-hexahydroxy flavan, one of isomeric leucorobinetinidins, and 4'-methoxy-2,3-trans-3,4-cis-3,4,7,3',5'-pentahydroxy flavan.

• Journal of the Korean Wood Science and Technology
• /
• 제30권3호
• /
• pp.42-47
• /
• 2002

This study was carried out to investigate the constituents of Sophora japonica(Leguminosae) bark. To isolate compounds, bark was extracted with ethanol and then partitioned with hexane, dichloromethane, ethylacetate and butanol successively. After partitioned, DCM fraction was subjected to column chromatography with various solvent system in silica gel and/or Sephadex LH-20. Structures were elucidated by spectroscopic methods including MS, ¹H, ¹³C and 2D-NMR experiments. Four compounds were isolated from the bark and identified as 3',7-dihydroxy-4'-methoxyisoflavone (cyclosin), puerol A, maackiain-3-O-𝛽-D-glucopyranoside (trifolirhizin), and 4', 5, 7-trihydroxyisoflavone (genistein). Among these compounds, cyclosin and trifolirhzin were first isolated from S. japonica.

• Journal of the Korean Wood Science and Technology
• /
• 제20권4호
• /
• pp.65-72
• /
• 1992

Steam defiberated pulp and steam exploded wood(birch chip) were extracted with solvents (hot-water, 1% NaOH, MeOH, hot water, 1% NaOH). The properties of residual fiber were examined for the utilization as ruminants feed. The digestibility is 38% in steam defiberated pulp(10kg /$cm^2$-15min) and 62-77% in exploded wood(17-18kg/$cm^2$-2~10min), respectively. The more steam pressure and time increase, the more the digestibility increase. The sugars obtained from extractives is amount from 7% to 13% in asplund pulp and from 7% to 10% in exploded pulp. The sugars was mainly composed of 70-80% xylose. The digestibility of residual fiber which is extracted with solvents is low than these of original fibers. Considering the yield and digestibility as ruminant feed, exploded pulp under 17kg /$cm^2$ for 10min has the best efficiency. The exploded wood gives 75.3% on yield(O. D. chip) and 48% on the digestibility.

• 한국산림과학회지
• /
• 제99권5호
• /
• pp.706-710
• /
• 2010

Understanding of chemical composition and energy contents in tree is important to develope strategies of renewable energy policy to cope with climate change. Residual biomass as renewable energy source was evaluated and focused on the bark-containing branches. Chemical analysis studies were conducted for different part of yellow poplar (Liriodendron tulipifera), which were partitioned to inner bark, outer bark, small branches, medium branches, big branches and trunk. The variations in hydrophobic extractives, hydrophilic extractives, lignin, carbohydrate compositions, energy contents (higher heating value) and the ash content were determined. The inner and outer bark had higher ash content, hydrophobic and hydrophilic extractives content, and higher energy content than those of tree trunk. Polysaccharides content in inner and outer bark was quite lower than those of stem or branches. Based on the energy content of residual biomass, replacement of fossil fuel and greenhouse gas emission abatement were calculated.

• Journal of the Korean Wood Science and Technology
• /
• 제33권5호통권133호
• /
• pp.86-91
• /
• 2005

Six compounds were isolated from the EtOAc and $Et_2O$ fractions of the bark of Rhus chinensis by repeated column chromatography with $SiO_2$ and Sephadex LH-20. The structures were determined by instrumental analysis using MS and NMR spectrophotometer as: gallic acid (1), methyl gallate (2), 6, 7-dimethoxycoumarin (3), orcinol-${\beta}$-D-glucoside (4), scopoletin (5), semialactone (6). Among these compounds, 6,7-dimethoxycoumarin (3) was isolated from this plant for the first time. To measure the antioxidant activity, the DPPH radical scavenging activity test was performed. Gallic acid (1) showed the strongest activity, while orcinol-${\beta}$-D-glucoside (4), semialactone (5) and scopoletin (6) had the low activities.

• Journal of the Korean Wood Science and Technology
• /
• 제24권3호
• /
• pp.45-50
• /
• 1996

Wood chips of oak(Quercus mongolica) and larch(Larix leptolepis) were treated with low pressure steaming explosion. Main components of exploded wood were separated with hot water and methanol extraction. Crude lignin separated from those extractives were purified and those chemical characteristics were investigated. And also, lignin adhesive was prepared from crude lignin and studied those chemical characteristics. The results can be summarized as follows ; 1. The purified lignin by Bj$\ddot{o}$kman's method from crude lignin is about 30% in exploded oak wood and is about 11% in exploded larch wood as a low amount. 2. The phenolic hydroxyl groups in the purified lignins are little higher than those of MWL and molecular weight distributions of the purified lignins are some lower than that of MWL. 3. Alkaline nitrobenzene oxidation products are very low in the clude lignin but those are increased in the purified lignin 4. The gravity of lignin resins(1.15 and 1.13) are a little lower than that of phenol resin(1.16) and the compressive shearing strength of lignin resins are higher than those of phenol resin.