• Journal of the Korean Wood Science and Technology
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• 제42권5호
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• pp.523-532
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• 2014

This study was done to evaluate the antioxidant effect of oak hot water extracts on the oxidative stress induced by reactive oxygen species (ROS). The cytotoxicity of $H_2O_2$-induced oxidative stress was performed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay for the cell viability according to the dose-dependent treatment. Oak extracts demonstrated a dose-dependent ability to inhibit $H_2O_2$-induced apoptosis in cultured tenofibroblasts, as assessed by MTT assay and FACS analysis. $H_2O_2$ increased the phosphorylation of extracellular regulated kinase1/2 (ERK1/2) and of c-Jun N-terminal kinase (JNK) and the production of reactive oxygen species (ROS). In contrast, treatment with oak extracts was decreased this activation of ERK1/2 and JNK, as confirmed by western blot analysis, and reduced the production of ROS, as verified by fluorescent microscopic and flow cytometry (FACS) analyses. These findings suggest that oak extracts, by suppressing JNK, ERK1/2, and intracellular ROS production, have a concentration-dependent antiapoptotic effect on achilles tenofibroblasts exposed to an oxidative stressor, and may have therapeutic potential.

• 생태와환경
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• 제38권4호통권114호
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• pp.475-481
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• 2005

본 연구는 새로운 환경친화적 살조제를 탐색하기 위한 연구의 일환으로, 담수에서 조류 대발생 원인종 Microcystis aeruginosa.를 대상으로 하여 국내에 자생하는 9가지 참나무 잎과 줄기로부터 추출한 물질의 조류생장 억제능력을 조사하였다. 추출물 농도 100 mg $L^{-1}$ 첨가시, 5가지 참나무 추출물 (QAT-L, QAT-S, QAS-L, QGI-S 및 QSA-L)은 M. aeruginosa의 7일 후 세포수를 90% 이상 감소시켰다. 20 mg $L^{-1}$의 경우에는 상기의 5가지 참나무 추출물에서 M. aeruginosa의 세포수가 약 50% 정도 감소하였다. M. aeruginosa를 효과적으로 제어하기 위한 참나무 추출물의 최소 농도는 20 mg $L^{-1}$로 조사되었다. 참나무의 주요 성분으로 알려져 있는 tannic acid는 17 mg $L^{-1}$의 농도에서 M. aeruginosa에 대한 억제효과를 나타냈다. 본 연구를 통해서 참나무 추출물은 부영양 수계에서 조류 대발생 원인종 M. aeruginosa를 제어하는 환경친화적 살조제로서 이용할 수 있을 것으로 판단된다.

• 한국식품과학회지
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• 제37권5호
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• pp.833-837
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• 2005

송화분, 참나무화분 및 백합화분에 대한 항산화 효능을 DPPH radical 소거능 및 동물조직의 지질산화 억제효능을 이용하여 평가하였다. 각 화분을 ethanol, 50% ethanol 및 물을 이용하여 추출물을 조제한 후 이들에 대한 DPPH radical 소거능을 분석한 결과 50% 소거능을 나타내는 $EC_{50}$ 값은, 송화분의 경우 50% ethanol 추출물(40.0mg/mL)이 가장 낮게 나타났으며 물 추출물(46.8mg/mL), 100% ethanol 추출물(131.2mg/mL) 순 이었다. 참나무화분에서는 50% ethanol 추출물(3.2mg/mL), 100%, ethanol 추출물(4.5mg/mL), 물 추출물(8.3mg/mL) 순이었고 백합화분에서는 100% ethanol 추출물의 $EC_{50}$값이 14.0mg/mL로, 50% ethanol 추출물(24.0mg/mL) 및 물 추출물(18.8mg/mL)에 비해 가장 낮았다. 3 종의 화분에서는 참나무 화분의 DPPH radical 소거능이 우수한 것으로 나타났다. 한편 $ascorbate-Fe^{3+}-EDTA$에 의해 유도되는 뇌조직에서의 지질산화도는 송화분, 참나무화분, 백합화분 추출물에 의해 모두 농도 의존적으로 억제되었으며 신장에서의 지질산화도 억제되었다. 그리고 이 중에서 송화분보다는 참나무와 백합화분의 효능이 우수한 것으로 나타났다. 화분 추출물에 대한 총 polyphenol의 함량을 분석한 결과 참나무화분$(32.5{\pm}2.9{\mu}g/mg\;pollen)$이 백합화분$(25.9{\pm}1.4{\mu}g/mg\;pollen)$이나 송화분$(9.3{\pm}0.7{\mu}g/mg\;pollen)$보다 높게 나타났다.

• Natural Product Sciences
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• 제29권1호
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• pp.42-49
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• 2023

This study investigated the effect of ethanol extracts of horsetail, alfalfa, ortie, chêne and aleppo oak on blood coagulation in vitro. Extraction was performed by the maceration method. Extracts were mixed with platelet and plasma, then prothrombin time (PT), activated partial thromboplastin time (APTT) and platelet aggregation tests were conducted. Alfalfa extract had a dose-dependent effect on the PT. Ortie, and horsetail, reduced the PT significantly compared to control group. Alfalfa, horsetail, and ortie reduced the APTT, but their effect was insignificant compared to the control group. The pooled extract showed the highest effect compared to the single extracts in a dose-dependent manner. Horsetail and alfalfa induced platelet aggregation in response to arachidonic acid but not in response to collagen. In the case of ortie, no aggregation occurred regarding the arachidonic acid, and incomplete was observed in response to collagen. Interestingly, blood clotting occurred immediately after adding the chêne, aleppo oak and the pooled extract, and therefore platelet poor plasma (PPP) and platelet rich plasma (PRP) became jelly. Generally, chêne and aleppo oak, as well as pooled extract, were more effective in inducing both primary and secondary coagulation pathways via shortening the PT and APTT, and induction of platelet aggregation.

• 보존과학연구
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• 통권30호
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• pp.157-170
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• 2009

We have evaluated the antifungal activities of oak vinegar to develop a natural biocide for organic cultural heritage. Fungi used in this study were screened from the cultural heritages, Kyujanggak and JanggyeongPanjeon and tested on organic substrates-degrading ability. In the results, 7 species of fungi have produced the extracellular enzymes to degrade CMC, xylan, lignin. Thus, we have used these seven species fungi to investigate the antifungal activity of oak vinegar in this study. In the result, the antifungal activity of oak vinegar indicated positive potencial. Especially, methylene chloride and ethylacetate fractions of the oak vinegar had high activities at the concentration of 5.0mg/disc. In these fractions, many different kinds of compounds such as phenolic and furfural, etc. were analyzed by GC-MS. The experiments indicated that the development of a biocide using natural extracts can have a potential to conserve of organic cultural heritages.

• 한국식품저장유통학회지
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• 제18권1호
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• pp.72-78
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• 2011

참나무 겨우살이의 생리활성을 알아보기 위해 전자공여 작용, SOD 유사활성, 총 폴리페놀 함량, Tyrosinase 저해효과 및 아질산염 소거작용을 측정하였다. 전자공여능은 추출용매의 비율에 따라 농도가 높아짐에 따라 전자공여능도 증가하였고, 특히 60% EtOH을 추출용매로 하여 25 mL/g의 비율로 추출한 실험구가 68.88%로 가장 높은 항산화력을 나타냈다(p<0.05). SOD 유사활성 측정에서는 모든 추출물이 15.24-30.84%로 비교물질인 L-ascorbic acid 보다 낮은 활성을 나타냈다(p<0.05). 총 폴리페놀 함량 측정 결과 참나무 겨우살이의 페놀 함량이 50.28-109.69 mg%로 나타났다. 추출조건에 따라 25 mL/g>50 mL/g>100 mL/g으로 농도가 높을수록 페놀함량도 유의적으로 높아졌고, 추출용매에 따라 물 추출물에 비해 에탄올 추출물에서 다소 높은 경향을 보였다. 아질산염소거능을 측정한 결과 pH 1.2와 pH 3.0과 같은 산성조건에서 소거능이 모두 높았고, 추출용매와 상관없이 농도가 높은 추출구에서 아질산염 소거능이 높게 나타났다.

• 대한수의학회지
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• 제45권2호
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• pp.151-154
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• 2005

The purpose of this study is to examine the elemental compositions, antioxidant and antitumor activity of water, 20%, 40%, 60%, and 80% ethanol extracts obtained from the fruiting body of Phellinus gilvus. In electron donating ability test, the strong activities more than 70% were observed in $80{\mu}g/ml$ of 20%, 40%, 60% and 80% ethanol extracts from the fruiting body of P. gilvus grown in oak and sawdust. The antitumor activity was evaluated by sulforhodamine B (SRB) in terms of cell survival level. The tumor cells (sarcoma 180) were treated with various ethanol extracts (water, 20, 40, 60 and 80%). The results showed that all extracts inhibited proliferation showing a dose-dependent manner against tumor cells.

• Applied Biological Chemistry
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• 제47권4호
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• pp.396-402
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• 2004

갈변표고버섯을 건강기능성 식품산업의 소재로 활용할 수 있는 가능성을 탐색하기 위하여 환원력과 세포 내 활성산소종에 대한 억제효과, 페놀화합물 및 피틴산의 함량, 대식세포의 NO 라디칼과 matrix metalloproteinase9(MMP9) 생성에 대한 제어작용 및 항변이원성을 생리활성의 지표로 갈변반응이 건강기능성에 미치는 영향을 평가하였다. 실험 결과, 에탄올추출물의 환원력이 열수추출물보다 전반적으로 우수하였으며 3.32 mg/ml 농도에서 갈변반응은 표고버섯의 환원력이 28%까지 증가시켰다. 갈변과정에서 페놀화합물의 함량은 생표고버섯에 비하여 73%정도 증가된 반면, 피틴산의 함량에 유의한 변화는 일어나지 않았다. 표고버섯 에탄올추출물의 처리는 $100\;{\mu}g/ml$의 시료농도에서 LPS 자극에 의한 대식세포의 NO 생성을 43% 이상 증진시킨 반면 열수추출물은 오히려 17%이상 억제시키는 것으로 나타났으나, 갈변반응이 용매별 추출분획의 NO 및 MMP9의 생성을 제어하는 경향에 변화를 일으키니 않았다. 또한 SOS chromotest를 이용한 항돌연변이 활성의 측정 결과도 mitomycin C가 유발한 돌변변이에 대한 표고버섯 추출물의 억제효과에 갈변반응이 큰 영향을 주지 않았다. 이상의 실험 결과는 상품성을 상실한 갈변표고버섯도 다양한 건강기능성 가공식품의 개발을 위한 원자재로 소비될 수 있음을 시사한다.

• 한국축산식품학회지
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• 제18권1호
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• pp.42-49
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• 1998

The contents of holocellulose, one of the main components of the wood, were 83.9% in oak wood and 76.9% in apple wood, respectively. Those of hemicellulose were 16.41 and 20.33%, and in lignin 23.0 and 19.7%, respectively. Six species of domestic oak wood and apple wood were considered to be suitable for smoking materials due to the low content of lignin. Benzo(a)pyrene contents in smoke flavoring prepared with oak wood at 150, 400 and 500$^{\circ}C$ were 0. 4, 3. 7 and 5.6$\mu\textrm{g}$,/kg, respectively. The amounts of phenanthrene were 112.7, 131.4 and 255.9$\mu\textrm{g}$/kg, respectively, in each temperature. The amounts of polycyclic aromatic hydrocarbons(PAH) in smoke flavory were in the order of phenanthrene＞anthracene＞pyrene＞benzo(a)anthracene＞chrysene＞benzo(b)fluoranthens＞benzo(a)pyrene Benzo(a)pyrene contents in smoking extracts prepared with apple wood at 150, 400 and 500$^{\circ}C$ were 0.4, 3.3 and 5.5$\mu\textrm{g}$/kg, respectively. Phenanthrene contents in those samples were 72.7, 100.2 and 220.5$\mu\textrm{g}$/kg, respectively. Contents of each PAH showed the same order as in oak wood.

• Journal of the Korean Wood Science and Technology
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• 제46권2호
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• pp.178-188
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• 2018

The aim of this study was to assess the in vitro potential of water extract from torrefied oak wood as a natural antioxidant. The antioxidant potential of the extracts was assessed by employing different in vitro assays, including reducing power, DPPH (2,2-diphenyl-1-picrylhydrazyl), ABTS [2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid)], and FRAP (ferric reducing antioxidant potential) assays. The DPPH activity of the extract was increased in a dose-dependent manner. Measurement of total flavonoid content of water extract from torrefied oak wood was achieved using an aluminum chloride colorimetric assay; the extract contained 192.12 mg/g flavonoid, which was significantly high when compared with standard quercetin. The results obtained in this study indicate that water extract from torrefied oak wood has significant potential for use as a natural antioxidant agent.