• Journal of the Korean Wood Science and Technology
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• 제45권6호
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• pp.671-681
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• 2017

Oil palm trunk (OPT) is a potential source of biomass for the production of biopellet. In the present research, biopellet were prepared from the meristem part of 25 years old OPT with various percentages of its bark (0, 10, and 30%). The highest biopellet durability was found for biopellet produced at $130^{\circ}C$ of pelletizing temperature with 30% bark content. Scanning electron microscopy (SEM) of biopellet showed the weak of particle bonding due to the low pelletizing pressure. The moisture content, unit density, ash content, and caloric value of OPT-based pellets were 3.55-5.35%, $525.56-855.23kg/m^3$, 2.76-3.44%, and 17.89-19.14 MJ/kg, respectively. The combustion profiles obtained by thermogravimetric analysis (TGA) seemed to be unaffected by the bark content on. Differential thermal analysis of TGA curve indicated different pyrolysis characteristic of hemicellulose, cellulose, and lignin.

• Journal of the Korean Wood Science and Technology
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• 제48권6호
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• pp.878-887
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• 2020

A neutral extract (NE), that is soluble in cold water and has excellent antioxidant activity, from Pinus radiata pine bark was prepared by sodium bicarbonate treatment, and its chemical characteristics were investigated. NE was prepared by treating P. radiata bark with 0.8% NaHCO₃ aqueous solution with a 5 : 1 liquor-to-bark ratio at boiling temperature for 1 h, resulting in 44% yield and final pH of 6.66. The yield of NE was 11% higher than that of the hot water extract (HWE) due to the increase in the solubility of polyphenols, the main component in the bark, by NaHCO₃ treatment. NE was characterized through FT-IR, NMR, and MALDI TOF MS analyses. The results indicated that NE is mostly composed of proanthocyanidins (PAs) consisting of procyanidin (PC) units. The acetylated neutral extract (Ac-NE) had weight average molecular weight (${\bar{M}}w$) of 5,300 Da. The Ac-NE had wide molecular weight distribution and its polydispersity (${\bar{M}}w/{\bar{M}}n$) was 6 times higher than that of pure PA. The antioxidant activity of NE was determined by 2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging assay and showed that NE had comparable antioxidant activity with pure PA.

• Journal of the Korean Wood Science and Technology
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• 제30권3호
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• pp.66-74
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• 2002

The effects of phenol during ethylene carbonate (EC) liquefaction of pine bark in the presence of methanesulfonic acid (MSA) as a catalyst were investigated. Liquefaction of pine bark using EC in the presence of acid catalyst was very difficult in comparison to wood. Mixing ethylene glycol (EG) with EC improved the liquefaction process, but the maximum liquefaction yield did not exceed 78%. Mixing 20~30% phenol with EC was very effective for the liquefaction and the residue was remarkably decreased. More than 95% of liquefaction was achieved when about 30% phenol was mixed with EC. The reaction conditions, such as catalyst concentration, liquefaction temperature and time, type of catalyst and liquefying agent, had a great influence on the liquefaction process. The results of the average molecular weights and the amount of combined phenols for the liquefied products indicated that sulfuric acid (SA) causes high condensation reactions compared to MSA.

• Journal of the Korean Wood Science and Technology
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• 제25권3호
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• pp.24-28
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• 1997

As a way to revive the traditional technology of Korean golden varnish(Hwangchill), the exudates of D. morbifera, this study was carried out at first to investigate the anatomical characteristics and the chemical composition of D. morbifera stems and their exudates. Trees of more than 20 years old were harvested at Wando and Jejudo islands in the southwestern part of Korean peninsula during different physiological seasons of winter, spring, and summer, The results obtained are as follows: 1. In the anatomical aspect of wood, Hwangchil woods is ring-porous wood, has alternate inter-vessel pittings and horizontal intercellular canal in xylem. 2. In the chemical aspect of wood and bark, the general compositions appeared hot to differ from those of other hardwoods, and ash and alcohol-benzene extractives showed little increase with the increase of atmospheric temperature of harvesting season. 3. In the solvent-sequential extraction of bark, wood and exudate, the exudates was extracted up to 80% by ether, but the bark and wood contained a very small amount of ether extractives, about 2% in the bark and 0.5% in the xylem.

• Journal of the Korean Wood Science and Technology
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• 제35권3호
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• pp.53-60
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• 2007

북양젓나무(Abies sibirica Ledeb)를 이용하여 온도별로 탄화한 목분탄, 목섬유탄 및 수피탄 등 목질탄화물에 대한 탄소함량, 세공특성 및 화학적 특성을 조사하였다. 목질탄화물의 종류와 관계없이 탄화온도가 상승할수록 탄화수율은 감소하였으며, 목탄의 탄소함량은 탄화온도의 상승과 함께 증가하였으나, 수소나 산소의 함량은 감소하였다. 특히 수피탄화물은 목분 또는 목섬유 탄화물과 비교하여 탄화수율이 높게 나타났으며, 수피탄화물내 회분함량도 상당히 높았다. 목분탄과 목섬유탄의 비표면적이 수피탄보다 큰 경향이 있으며, $600^{\circ}C$까지는 탄화온도의 증가와 함께 비표면적, 전세공용적이 증가하여 최대를 나타내었으나, $800^{\circ}C$로 탄화온도가 상승하면 오히려 비표면적과 총세공용적이 감소되었다. 그러나 평균세공크기는 목탄종류와 관계없이 탄화온도의 상승과 함께 감소하였다. 한편 목탄의 표면 관능기양은 탄화온도가 높을수록 산성인 HCl 흡착량이 많고, 탄화온도가 낮을수록 염기성인 NaOH, $Na_2CO_3$ 및 $NaHCO_3$ 흡착량이 많으며, 이러한 결과는 목탄의 pH에 영향을 주어 고온탄화물은 알칼리성, 저온탄화물은 산성을 나타내는 것으로 생각된다.

• 한국약용작물학회지
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• 제26권3호
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• pp.233-239
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• 2018

Background: Inflammation plays an important role in various diseases, including ulcerative colitis, Behcet's disease, and rheumatoid arthritis. In this study, we investigated the anti-inflammatory effects of Morus alba L. extracts obtained using different extraction methods (water extraction or high temperature extraction) on RAW264.7 cells. Methods and Results: Extracts from the central part (including the heartwood, sapwood, cambiun, and phloem) and bark (including the periderm and cortex) of Morus alba L. were obtained using either water or high temperature extraction. The following extract were obtained: MA1, water extract from the central part of Morus alba L., MA2, high temperature extract from the central part of Morus alba L., MA3, water extract from the bark of Morus alba L., and MA4, high temperature extract from the bark of Morus alba L. None of these extracts was observed to be cytotoxic to RAW264.7 cells. The MA2 extract reduced the production of LPS-induced NO (nitric oxide), $PGE_2$ (prostaglandin $E_2$), $TNF-{\alpha}$, IL-6, and $IL-1{\beta}$ production in LPS-stimulated RAW264.7 cells. Conclusions: These results indicated that the inflammatory response was moderated by MA2. Treatment with MA2 could be used as a natural medicine for treating diseases involving inflammation. However, further experiments are required to determine how the high temperature extraction method alters the active ingredients in the extract and influences the anti-inflammatory effects of Morus alba L..

• Current Research on Agriculture and Life Sciences
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• 제32권3호
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• pp.131-134
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• 2014

The thermal death kinetics of the Black timber bark beetle, Xylosandrus germanus, was investigated to develop a heat treatment for control of infested wood packing materials used to export goods. To determine the feasibility of microwave irradiation as an alternative control method, laboratory experiments irradiating wooden blocks of Douglas fir ($200{\times}200{\times}250mm$), which were artificially infested with adults, with 2.45 GHz of microwave energy. All (100%) Ambrosia beetle adults were killed by both hot water treatments and microwave irradiation at $52^{\circ}C$ and $58^{\circ}C$, respectively. Probit analyses estimated the internal wood temperature required to produce Probit (0.99) efficacy to be $64.7^{\circ}C$ (95% CI $62.4-69.9^{\circ}C$) at one minute after microwave treatment.

• 임산에너지
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• 제21권2호
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• pp.1-9
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• 2002

소용량 실험실용 탄화로 및 3종류의 대형 탄화로 (간이 탄화로 (400 - 500℃), 개량 탄화로(600 - 700℃) 및 전용탄화로 (800 - 1,000℃))를 이용하여 소나무 수피의 탄화를 실시하였다 그리고 제조된 수피탄의 물성과 세공구조를 분석하였다. 소나무 수피를 실험실용 소용량 탄화로를 이용하여 질소 존재하에서 500℃에서 900℃까지의 다양한 온도 조건에서 탄화시키면, 탄화수율은 탄화 온도의 증가와 함께 급속하게 낮아졌으며, 700 - 900℃에서 일정하게 유지되었다. 수피의 탄화수율은 동일 탄화온도에서 소나무 목부의 탄화수율보다 16 - 18％더 높았다. 제조된 수피탄의 BET 비표면적은 탄화수율 약 35 - 40％에서 약400 - 500㎡／g 을 나타내었다. 600℃ 30분의 탄화조건에서 제조된 소나무 목부탄은 미세공이 많이 발달해 있었으나, 동일조건에서 제조된 수피탄이 경우 미세공은 물론 중세공도 많이 존재하였다. 대형 탄화로에서 제조된 수피탄의 탄화 수율 및 요오드가 및 BET 비표면적은 소용량 탄화로의 결과와 매우 유사하였다. 이러한 결과는 소나무 수피가 높은 비표면적과 수율을 가지는 양질의 숯을 생산 할 수 있는 원료로 사용될 수 있음을 나타낸다.

• 생명과학회지
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• 제8권6호
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• pp.648-653
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• 1998

1. 포장 또는 비포장의 부패된 어육연제품에서 분리된 미생물의 대부분(약 98%)은 Bacillus속을 비롯한 세균류였다. 특히 비포장어묵제품에서는 곰팡이도 약 0.1%검출되었다. 이들 부패미생물에 대한 계피추출물의 최저증식억제농도는 세균과 곰팡이에 대하여 각각 160~640$\mu\textrm{g}$/$m\ell$과 40~80$\mu\textrm{g}$/$m\ell$으로 나타났다. 2. 흰살어묵의 원료 배합시 계피추출물을 0.5% 첨가하면 첨가하지 않은 것에 비하여 $25^{\circ}C$에서 보존기간이 2일 연장되었다. 또한, 계피추출물과 ethanol을 1 : 3으로 혼합한 액을 튀김어묵표면에 분무한 것은 ethanol만 분무한 대조구에 비하여 곰팡이 발육이 2일간 지연되었다. 3. 샌드위치와 찹쌀떡의 표면에 계피추출물과 ethanol을 1 : 1 비율로 혼합한 액을 분무하여 $25^{\circ}C$에서 저장하면 곰팡이 발육이 대조구에 비하여 보존기간이 각각 5일과 7일정도 연장되었다.

• 한국응용과학기술학회지
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• 제27권1호
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• pp.76-86
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• 2010

This study was conducted to evaluate the effects of dietary Korean red pine bark extract as an antibiotic replacements on cholesterol, fatty acids and the shelf-life of chicken meat. To accomplish this, chickens were fed the optimal level of red pine bark extract that was found to replace antibiotics in the diet of broilers. A total of 180 male broilers(Ross strain 308) were divided into three treated groups, T1(control group), T2(8 ppm of avilamycin) and T3(65 ppm of red pine bark extract per kg diet). The lipid content was reduced by 24.67% and 20.49% in T3 group, while the cholesterol level also decreased significantly in the T3 group by 20.49% and 20.55% when compared to the T1 and T2 groups, respectively. In addition, the saturated fatty acid level was lower in the T3 group than in the T1 and T2 groups, while the unsaturated fatty acid level of the T3 group was significantly higher than those of the other groups. The TBARS value of chicken thigh muscle containing its skin on the 7th day of low temperature storage was significantly lower by 23.86% and 21.17% in the T3 group than in the T1 and T2 groups, respectively. Evaluation of the color of the meat revealed that the $L^*$value (lightness) and $b^*$value(yellowness) were higher in the T3 group than in the T1 and the T2 groups, but that the pH was significantly lower in the T3. Based on the results of this study, the addition of 65 ppm red pine bark extract to the diet of broilers should improve their meat quality with respect to the lipid contents and shelf-life when compared to the addition of antibiotics.