• 식물병연구
• /
• 제12권2호
• /
• pp.85-90
• /
• 2006

차나무 겹퉁근무늬병을 일으키는 Pestalotiopsis longiseta에 대하여 강력한 길항능력을 나타내는 Bacillus subtilis BD0310 균주의 대량배양을 위한 배양조건과 P. longiseta에 대한 항균활성을 증대시킬 수 있는 탄소원과 질소원을 선발하였다. B. subtilis BD0310 균주를 대량배양하기 위한 최적온도 및 시간은 $30^{\circ}C$, 24 시간인 것으로 확인되었으며, 초기 최적 pH 는 7 로 확인되었다. B. subtilis BD03l0 균주를 대량으로 배양할 경우 P. longiseta에 대한 항균활성을 가장 높게 증가시키는 탄소원을 선발하기 위하여 fructose, galactose, glucose, glycerol, inositol, lactose, maltose, sorbitol, starch 등 9 가지 탄소원을 사용하여 조사한 결과 maltose와 inositol이 가장 효율적인 탄소원으로 선발되었으며, casein, tryptone, malt extract, yeast extract, $(NH_4)_2SO_4$등 5 가지 질소원 중에서 yeast extract와 tryptone이 가장 효율적인 질소원으로 선발되었다. 이러 한 결과들은 길항세균 B. subtilis BD0310를 차나무 겹둥근무늬병 방제용 미생물제제로 개발하기 위한 대량배양생산 공정을 확립하는데 기여할 것으로 전망된다.

• 대한약학회:학술대회논문집
• /
• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
• /
• pp.340.1-340.1
• /
• 2002

Centella asiatica is an herbal plant used on different continents by diverse ancient cultures and tribal groups. Historically. the extract has been used as a wound healing agent, The extract has three different triterpenoid ingredients: asiaticoside. asiatic acid, and madecassic acid. It has been reported that its wound healing activity is associated with the modulation of collagen synthesis in the skin dermis. The wound healing property of the extract has led to its commercial introduction under the trade name, Madecrlssol. As part of our program toward the development of new wound healing agents. structere activity relationship (SAR) studies have been performed by modifying asiatic acid. In this communication. the SAR study of esiatic acid for the development of an efficient woind healing agent is reported.

• 한국염색가공학회지
• /
• 제20권3호
• /
• pp.18-24
• /
• 2008

The purpose of this study is to develop the dyeing method with dry leaves of indigo plant. Coloring matter was extracted from dry leaves of indigo plant with hot sodium hydroxide solution. The extract was reduced with sodium dithionite, and it was used for dyeing cotton fabrics under various conditions. UV-visible absorption spectra of extract, reduction rate of extracts by reducing agent, and the surface color of dyed cotton, lightfastness were examined. For the initial 20 minutes, the absorbance of indigo solution rapidly decreased. However, several hours later, the decreasing rate retarded. By repeating the dyeing process, the shade looked deeper and deeper. At $30-40^{\circ}C$, the value of K/S reached the highest point. The concentration of indigo solution in dye bath seemed to playa critical role for the reaction of the reducing agent. It was observed that the surface color of cotton fabrics was getting bluish and its degree of value and chroma seemed slightly decreased as the K/S value was increasing. The lightfastness was clearly enhanced by increasing the K/S value.

• The Plant Pathology Journal
• /
• 제17권1호
• /
• pp.52-56
• /
• 2001

This study was undertaken to separate and identify antifungla substances produced by Gilocladium virens G1, a biocontrol agent used for the control of plant diseases caused by Rhizoctonea solani. The culture of G. virens G1 effectively inhibited the growth of R. solani, Colletotrichum gloeosporioides, and Phytophthora capsici, but less that of Fusarium oxysporum. The n-hexane extract of the G. virens culture, which was used for the purification of responsible substances, strongly inhibited R. solani and C. gloeosporioides, but not P. capsici, although the n-butanol extract was effective on all of the pathogens tested. An antifungal substance was purified using the n-hexane extract by Silica gel column chromatography and HPLC. The substance was examined for purity by HPLC and for nature by UV spectrometry, which differed from known antibiotic compounds such as gliotoxin, viridin and gliovirin. The antifungal substance was very liphophilic based on its solvent-solubility and Rf values on TLC, and more inhibitory to C. gloeosporioides than other fungal pathogens tested.

• 생약학회지
• /
• 제49권4호
• /
• pp.291-297
• /
• 2018

Coxsackievirus B3 (CVB3) is a very well-known causative agent for viral myocarditis and meningitis in human. However, the effective vaccine and therapeutic drug are not developed yet. CVB3 infection activates host cell AKT signaling. Inhibition of AKT signaling pathway may attenuate CVB3 replication and prevent CVB3-mediate viral myocarditis. In this study, we determined antiviral effect of the selected natural plant extract to develop a therapeutic drug for CVB3 treatment. We screened several chemically extracted natural compounds by using HeLa cell-based cell survival assay. Among them, Linum usitatissimum L. extract was selected for antiviral drug candidate. L. usitatissimum extract significantly decreased CVB3 replication and cell death in CVB3 infected HeLa cells with no cytotoxicity. CVB3 protease 2A induced eIF4G1 cleavage and viral capsid protein VP1 production were dramatically decreased by L. usitatissimum extract treatment. In addition, virus positive and negative strand genome amplification were significantly decreased by 1 mg/ml L. usitatissimum extract treatment. Especially, L. usitatissimum extract was associated with inhibition of AKT signal and maintain mTOR activity. In contrast, Atg12 and LC3 expression were not changed by L. usitatissimum extract treatment. In this study, the potential AKT signal inhibitor, L. usitatissimum extract, was significantly inhibited viral genome replication and protein production by inhibition of AKT signal. These results suggested that L. usitatissimum extract is a novel therapeutic agent for treatment of CVB3-mediated diseases.

• 생약학회지
• /
• 제47권2호
• /
• pp.137-142
• /
• 2016

Enterovirus is a common cause of several severe diseases such as myocarditis, hand-foot-mouth disease, and meningitis in children and adult. There are many try to develop new antiviral drug for direct treatment in virus infection. However, synthetic chemical antiviral drug is not working. To overcome this limitation, we examined plant extracts. The antiviral effect of plant extracts was screened by HeLa cell survival assay in coxsackievirus B3 (CVB3) infection. We observed a strong antiviral effect of Poria cocos extract in a dose-dependent manner (1 mg/ml~0.01 mg/ml). P. cocos extract (1 mg/ml) treatment was dramatically decreased virus protease 2A induced eIF4G-I cleavage and virus capsid protein VP1 production. CVB3 positive and negative strand RNA amplification were significantly reduced in P. cocos extract treatment. P. cocos extract completely blocked early time activation of ERK and AKT activity in CVB3 infection. Taken together these data indicate that the treatment of P. cocos extract strongly inhibit CVB3 replication. Poria cocos extract may possible to developed as a therapeutic agent for enterovirus.

• KSBB Journal
• /
• 제27권3호
• /
• pp.157-160
• /
• 2012

When iron oxide magnetic nanoparticles were synthesized by co-precipitation method using aqueous ammonia as reducing agent, the synthesized particles were aggregated and thus precipitation occurred. Using Magnolia kobus leaf extract as reducing agent, spherical nanoparticles of 50~200 nm were synthesized with low yield. By using both Magnolia kobus leaf extract and aqueous ammonia as reducing and stabilizing agents, smaller nanoparticles of 40~120 nm could be synthesized with various shapes. The synthesized magnetic nanoparticles were characterized with field emission transmission electron microscopy (FE-TEM) and scanning electron microscopy (SEM). TEM and SEM images showed that the magnetic nanoparticles are a mixture of triangles, tetragons, rods and spherical structures.

• Toxicological Research
• /
• 제30권1호
• /
• pp.45-48
• /
• 2014

Helicobacter pylori (H. pylori) is the most important factor of gastric disease in clinical practice. Moreover, smoking, stress and a poor diet may be additive factors for gastric damage. With these factors, increasing infection of H. pylori triggers gastritis, gastric ulcers and gastric cancer. To develop a new protective agent, we are concerned with plant-derived extract. The extract of Coptis chinensis (C. chinensis) and its constituents were investigated to assess their protective activities against gastric damage. The C. chinensis extract showed a scavenging effect against 2, 2-diphenyl-1-picrylhydrazyl (DPPH) and superoxide radicals, inhibition of H. pylori colonization and antiulcerogenic activities in rat. In particular, palmatine derived from C. chinensis was found to be the novel protective agent. It is better than the C. chinensis extract, berberine, a well-known constituent of C. chinensis. We suggest that palmatine from the root cortex of C. chinensis may be a good candidate for the development of new pharmaceuticals to prevent gastric disease.

• Natural Product Sciences
• /
• 제13권3호
• /
• pp.180-185
• /
• 2007

Dichrostachys cinerea (Linn.) is commonly known as Vadatalla and used as phytotherapeutic agent. Tender shoots of the plant bruised and applied to the eyes in case of ophthalmia. The root is astringent and used in rheumatism, urinary calculi and renal troubles. The effect of the Ethanolic and aqueous extract of the root of D. cinerea were studied for its anti-urolithiatic and diuretic activity at 200 mg/kg dose level in male Wistar albino rats. Ethylene glycol feeding resulted in hyperoxaluria as well as increased renal excretion of calcium and phosphate. Supplementation with aqueous and ethanolic extract of the plant significantly reduced the elevated urinary oxalate, showing a regulatory action on endogenous oxalate synthesis. Compared to ethanolic extract, aqueous extract exhibited significant anti-urolithiatic activity. Both the extracts showed significant diuretic activity. The results of our present study supports folklore claim of D. cinerea.

• 한국자원식물학회지
• /
• 제23권5호
• /
• pp.430-435
• /
• 2010

본 연구는 천연 식품보존료 개발의 일환으로 한약 재료로 이용되고 있는 개머루덩굴을 에탄올로 추출하여 식품부패 및 병원성 미생물에 대한 항균활성을 조사하였다. 개머루덩굴 에탄올 추출물은 식품부패 및 병원성 미생물에 대해 농도 의존적으로 항균효과를 보였으며, 그 중에서 Escherichia coli O157:H7 균에 대해 가장 높은 항균효과를 보였다. 또 개머루덩굴 에탄올 추출물이 식중독 유발세균의 성장에 미치는 효과를 검정하기 위해 Salmonella typhimurium, Yersinia enterocolitica, Staphylococcus aureus, Escherichia coli O157:H7 균들의 배양액에 개머루덩굴 에탄올 추출물의 농도를 250, 500, 1,000, 2,000 mg/L 각 농도별로 첨가하여 생육을 조사한 결과 250 mg/L까지는 대조군과 별 차이를 보이지 않았으나 500 mg/L 이상에서는 유의적인(p<0.05) 감소를 관찰할 수 있었다. 본 연구결과는 개머루덩굴 에탄올 추출물이 식중독을 유발시키는 세균에 대하여 우수한 항균작용을 나타내고 있으며, 따라서 개머루덩굴이 효과적인 천연보존료로서 이용될 수 있음을 시사하고 있다.