• The Plant Pathology Journal
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• 제16권3호
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• pp.137-141
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• 2000

A causal fungus of turfgrass blight was isolated from the infected leaves of zoysiagrass (Zoysia japonica Steud.) and identified as Nigrospora sphaerica (Sacc.) Mason by using a light misroscope. Its conidia are large (14-20 ${\mu}{\textrm}{m}$ diameter), shiny, black, aseptate, and smooth-walled spheres. The fungus caused typical blighting symptoms on the two turfgrass plants of bermudagrass (Cynodon dactylon (L.) Pers.) and bentgrass (Agrostis palustris Huds.). The fungus was found to produce a phytotoxic subtance to be associated with the pathogenic mechanism. A phytotoxin was isolated from the liquid cultures of N. sphaerica by repeated silica gel column chromatography and its structure was determined to be 5, 6-dihydro-5-hydroxy-6-propenyl-2H-pyr-2-one (T-3 compound). It was not a host-specific toxin showing phytotoxic effects to various plants inclusing turfgrasses in the leaf-wounding assay, the whole plant test, and the cellular leakage test. The compound caused leaf tip dieback symptoms in turfgrass plants similar to those caused by the pathogen. Thus, T-3 compound is thought to be involved in the development of Nigrospora blight.

• 한국미생물·생명공학회지
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• 제25권6호
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• pp.586-591
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• 1997

In the course of screening for the tipA promoter-inducing substances, we isolated an active compound, sulfomycin Ia, from the mycelium of a microorganism designated 50634. The producing organism was identified as Streptomyces sp. on the basis of taxonomic studies. Sulfomycin Ia was purified from mycelial extract by silica gel column chromatography, LH-20 column chromatography, silica gel TLC, and preparative HPLC. The molecular weight of sulfomycin Ia was determined to be m/z 1129 (M+Na)$^{+}$ by FAB mass measurement and $^{1}$H NMR spectroscopic analysis. The structure was assigned as a derivative of sulfomycin I with thiazole, methyloxazole, oxazole, and pyridine rings by $^{1}$H NMR spectral data.

• 분석과학
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• 제8권4호
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• pp.829-834
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• 1995

Whole column coldtrapping(WCC) on a fused silica capillary (FSCC)combined with GC/MS analysis was evaluated for use in the investigation of volatile organic compounds(VOCs) in indoor air. Research had indicated that a temperature of $-80^{\circ}C$ is optimal for WCC. Samples were analyzed on a $50m{\times}0.2mm$ cross-linked 5% phenylmethylsilicone fused silica column. Liquid nitrogen was used as the coolant for the peak resolution significantly. The analysis can be performed quickly and conveniently. More than 112 of VOCs were determined in the samples from three typical indoor environment including: (1) a room which had just been decorated involving building materials and paints; (2)a kitchen used for Chinese cooking, and (3) a room had tobacco smoke. The method is could be readily applied to rapid sample screening for VOCs contamination surveys or initial investigations with its valid and simple sampling and analytical technique.

• 한국미생물·생명공학회지
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• 제22권5호
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• pp.495-498
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• 1994

Genistein, a inhibitor of the progression of G$_{1}$ and G$_{2}$ phase of the mammalian cell cycle, was discovered through a unique screening system, in which effects of microbial metabolites on the cycle progression of the cultured mouse mammalian carcinoma cell were monitored by flow cytometry. The inhibitor was extracted from the fermentation broth of Streptomyces sp. ZF10 with ethyl acetate, and purified by silica gel column chromatography and HPLC.

• 분석과학
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• 제26권4호
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• pp.228-234
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• 2013

국내에서 불법 유통 되거나 남용되고 있는 methamphetamine은 아민을 함유한 불법약물로서 그에 대한 신속하고 용이한 동정 및 정량적인 분석 방법은 불법약물 검사의 중요한 이슈가 되어왔다. 새로운 screening방법을 모색하기 위해 methamphetamine과 구조적으로 유사한 3종의 유기 화합물을 silica gel ($SiO_2$) TLC상에서 N-(9-Fluorenylmethoxycarbonyloxy)succinimide (FMOC-NHS)와 반응을 시켰다. TLC상 반응 생성물을 일반 유기합성 경로로 합성한 대조물질과 비교 확인한 다음, 이 방법의 검출한계(Limit of detection)를 조사하였다. 실험결과 유도체화 시약으로 사용한 FMOC-NHS는 TLC상에서 1차 및 2차 아민과 반응하여 UV-active한 화합물을 생성시키는 것을 확인하였다. 2D TLC 실험에서는 0.045-0.01 mg/mL ($2{\mu}L$ per spot), 그리고 1D co-spot TLC 실험에서 0.002-0.007 mg/mL ($2{\mu}L$ per spot)의 검출한계는 유도체화 시약의 농도에 대한 의존성을 나타내었다.

• 한국미생물·생명공학회지
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• 제20권3호
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• pp.335-343
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• 1992

미생물이 생산하는 대사길항물질을 screening한 결과 최소검정배지에서 Gram 양성균에 항균활성을 나타내고 L-leucine에 의하여 그 항균활성이 길항당하는 182-27 물질을 생산하는 방선균을 토양에서 새로이 분리하였다. 본 생산균을 분류 동정한 결과, 유연균을 찾아볼 수가 없고 신 균종으로 동정하기에는 많은 type culture와의 비교분류를 하여야만 하므로 여기서는 다만 기균사의 포자형성과 세포벽 성분의 조성, 형태학적 성상 등으로 보다 Streptomyces sp.로만 동정하였다. 182-27 균주의 배양조건을 검토하고 최적조건에서 대량 배양하여 그 배양여액으로부터 이온교환수지, silica gel column chromatography 등에 의하여 활성 물질을 분리 정제하였으며 배양액 약 20$\ell$에서 약 20mg의 백색분말을 얻었다. 182-27 물질은 그의 이화학적 성질로 보아 아미노산 유연물질로 추정할 수가 있으나 그의 화학구조는 아직 밝히지 못했다. 생물학적 성질은 최소검정배지상에서 Gram 양성균에 항균력을 나타냈고 이러한 항균력은 L-leucine의 첨가에 의해 저해 당했다.

• Applied Biological Chemistry
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• 제36권2호
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• pp.134-137
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• 1993

우리나라 전지역의 산과 들에 야생하고 있는 고들빼기(Youngia sonchifolia Max.)는 전통식품인 고들빼기 김치의 원료로 이용될 뿐만 아니라 오래전부터 민간에서 위장장애 치료재로 이용되어 왔다. 그래서 고들빼기의 생화학적 활성 및 항암 실험과 그 특수성분을 분석하였는데 hexane 추출물 중에서 silica gel column chromatography와 재결정으로 얻어낸 화합물은 무색판상 결정으로 융점이 $280{\sim}282^{\circ}C$ 이었으며 구조결정을 위해 $^{13}C-NMR$, $^1H-NMR$, MS로 분석한 결과 pentacyclic triterpene인 bauerenyl acetate인 것을 확인하였다.

• Archives of Pharmacal Research
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• 제20권3호
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• pp.275-279
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• 1997

Helicobacter pylori (H. pylorl) infection is now established as the major pathogenic factor in chronic gastritis and peptic ulcer disease. in addition, there is accumulating evidence that H. pylori plays an important role in the process of gastric carcinogenesis. On the other hand, oriental traditional medicines have been used for stomach disease for thousands of years. In the present study, methanol extract from the stem bark of Magnolia sieboldii (M. sieboldii) and its components were investigated on their inhibitory effects against urease activity and growth of H. pylori in vitro. The methanol extract of M. sieboldii significantly inhibited the growth of H. pylori ATCC 43504 at 5 mg/ml. From the further fractionation, the chloroform fraction inhibited the bacterial growth dose-dependently. Among four fractions separated from the chloroform fraction by silica gel column chromatography, MS-C-2 was the most potent. Costunolide was isolated from the MS-C-2 subtraction by preparative TLC and recrystallization using n-hexane. Anti-H. pylori effect of costunolide was investigated using one commercial strain (H. pylori ATCC 43504) and three clinical strains (H. pylon 4, 43, 82548). Costunolide exhibited potent anti-H. pylori activity, and the MIC was around $100-200{\mu}g/ml$. However, costunolide had no inhibitory effect of H. pylori urease activity at the concentration used for the growth inhibition assay. From these results, we conclude that costunolide inhibits the, growth of H. pylori by the independent manner of H. pylori urease inhibition.

• 한국미생물·생명공학회지
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• 제26권6호
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• pp.558-561
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• 1998

식용버섯인 버들송이(Agrocybe cylindracea)로부터 새로운 생리활성물질을 탐색하던 중 버들송이 자실체의 methanol 추출물로부터 Diaion HP-20 column chromatography, ethyl acetate extraction 및 silica gel column chromatography를 행하여 AG 8을 분리하였다. 분리된 AG 8의 구조해석을 위하여 Mass, $^1$H 및 $^{13}$C NMR, irradiation실험 및 HMBC를 실시한 결과 분자량이 297, 분자식이 $C_{11}$ $H_{15}$$N_{5}$$O_3$S인 nucleoside계 화합물 5'-deoxy-5'-methylthioadenosine(MTA)으로 동정하였다. AG 8의 지질과산화 저해활성은 $IC_{50}$/ 값이 3.2 $\mu\textrm{g}$/$m\ell$ 이었으며 양성 대조구인 vitamin E보다 3배 정도 낮은 활성을 보여주었다. 본 화합물은 고등동물의 대사과정에 관여하는 효소 대사 조절물질로 고등동물을 비롯한 각종 생물체에 존재하는 것이 보고되었으나 담자균류로부터는 본 연구에 의하여 처음 분리되었다.

• 농업과학연구
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• 제48권2호
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• pp.343-351
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• 2021

Screening was conducted using 200 kinds of plant extracts to explore herbicide-activated components of plant origin. We separated and purified active substances and elucidated chemical structures using Ligularia stenocephala M., which has strong activity and has not yet been studied. When the solvent fractions of the leaves of Ligularia stenocephala M. were tested for their herbicidal activity, ethyl acetate and chloroform layer showed an inhibition rate of 95.2% and 94.1%, respectively. In particular, the chloroform layer exerted more than 50% herbicidal activity at 10 ppm. From the chloroform layer with the highest herbicidal activity, we isolated three herbicidal active compounds using stepwise chromatography, specifically silica gel or octadecyl silica (ODS) column chromatography, Sep-pak cartridges, and high performance liquid chromatography (HPLC). Based on the analysis of the active compounds using electron ionization mass spectroscopy (EI-MS), ¹H-NMR, and ¹³C-NMR, we identified the active compounds as euparin, 5,6-dimethoxy-2-isopropenylbenzofuran, and liguhodgsonal. When the herbicidal activity of the identified compounds was tested, euparin showed selective herbicidal activity for lettuce at 10^-3 M, and both liguhogsonal and 5,6-dimethoxy-2-isoprophenylbenzofuran exerted selective activity for rice and Echinochloa crus-galli.