• 약학회지
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• 제45권6호
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• pp.588-590
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• 2001

Two flavanones, (2S) -2'-methoxykurarinones (1) and kurarinones (2) , were isolated from the ethyl acetate extract of the roots of Sophora flavescense Ait. Their structrures were elucidated using NMR, UV and IR spectral analysis. These compounds exhibited a moderate antimicrobial activities against Staphylococcus aureus, Staphylococcus epidermidis Pseudomonas Putida and a weak anti-fungal activity against Candida albicans.

• Journal of Applied Biological Chemistry
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• 제57권2호
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• pp.159-160
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• 2014

An antifungal antibiotic was extracted three times using n-butanol from the culture broth of Bacillus sp. Bioassayguided column chromatography with silica gel and Sephadex LH-20 yielded 62 mg of the original active compound from 1 L of culture broth. The minimal inhibitory concentration values were 25 and $50{\mu}g/ml$ against Pyricularia oryzae and Pellicularia filamentosa, respectively. Based on results obtained from the analysis of the structure of the antibiotic using MS, NMR, and IR spectroscopy, the antifungal antibiotic was shown to consist of only six of fructose.

• 생약학회지
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• 제35권4호통권139호
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• pp.375-379
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• 2004

According to the traditional chinese herbal Cuscuta japonica Choisy and C. australis R.Be (original plant of Semen Cuscutae in Korea) have been used to cure pimple. In order to prove their bacteriostatic effects against Propionibacterium acnes, we performed the micro broth dilution method. The minimal inhibitory concentration (MIC) of C. japonica juice was 27.3 mg/ml, but C. australis juice showed no effect. The MIC of water extracted C. japonica seed and Wontosa and Bupjetosa were $960\;{\mu}g/ml$. The MIC of both water and ethanol extracts of C. australis seed was $9240\;{\mu}g/ml$. But ethanol extracts of C. japonicaseeds, Wontosa and Bupjetosa had no bacteriostatic activity. We also performed the disk diffusion test, C. japonica juice had prominent effect. Water extracts of C. japonica seed, Wontosa and Bupjetosa showed bacterio-static effect in 10 mg/ml, and C. australis seed in 10 mg/ml. The ethanol extract of C. japonica seed, Wontosa and Bupjetosa, and C. australis seed showed bacteriostatic effect in 20 mg/ml.

• Bulletin of the Korean Chemical Society
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• 제32권9호
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• pp.3219-3222
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• 2011

Three types of ${\beta}$-ketoacyl acyl carrier protein synthase (KAS) are important for overcoming the bacterial resistance problem. Recently, we reported the discovery of a antimicrobial flavonoid, YKAF01 (3,6-dihydroxyflavone), which exhibits antibacterial activity against Gram-positive bacteria through inhibition of ${\beta}$-ketoacyl acyl carrier protein synthase III (KAS III). In this report, we suggested that YKAF01 can be an inhibitor ${\beta}$-ketoacyl acyl carrier protein synthase I (KAS I) with dual inhibitory activity for KAS I as well as KAS III. KAS I is related to the elongation of unsaturated fatty acids in bacterial fatty acid synthesis and can be a good therapeutic target of designing novel antibiotics. We performed docking study of Escherichia coli KAS I (ecKAS I) and YKAF01, and determined their binding model. YKAF01 binds to KAS I with high binding affinity ($2.12{\times}10^6$) and exhibited an antimicrobial activity against the multidrug-resistant E. coli with minimal inhibitory concentration (MIC) value of 512 ${\mu}g$/mL. Further optimization of this compound will be carried out to improve its antimicrobial activity and membrane permeability against bacterial cell membrane.

• 한국치위생학회지
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• 제14권1호
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• pp.117-122
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• 2014

Objectives : The purpose of the study is to investigate the activities of Nelumbo nucifera leaf extracts on Streptococcus mutans, Streptococcus mitis, Streptococcus sobrinus, Porphyromonas gingivalis, Prevotella intermedia, and Treponema denticola. Methods : The inhibitory effect of lotus leaf extracts on the growth of oral bacteria was assessed in experiments with extracts from freshly harvested and pulverized lotus leaves and bacterial cultures of dental caries. Results : The results showed that N. nucifera extracts possess antimicrobial activity on all bacterial strains. The minimal inhibitory concentration (MIC) values varied from 4 mg/ml to 10 mg/ml against antimicrobial activity. The relative growth ratio (RGR) against of N. nucifera extracts were determined as 50% in concentration of 4.0 mg/ml. The extract of N. nucifera was effective in reducing on the glucosyltransferase (GTase) activity of six strains in vitro. Conclusions : Methanol extracts of lotus leaves showed antimicrobial effects on three bacterial species causing dental caries and three bacterial species causing periodontitis, as well as inhibitory effects on GTase activity.

• 한국식품위생안전성학회지
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• 제14권1호
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• pp.27-33
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• 1999

Phytic acid, making up 1~5% of the composition of many plant seeds and cereals, is known to form iron-chelates and inhibit lipid peroxidation. Thiobarbituric acid reactive substances (TBARS), as an indication of lipid peroxidation, were measured in beef round, chicken breast, pork loin, and halibut muscle after the meats were stored for 0, 1, 3, 5, and 7 days at various temperatures [frozen (~2$0^{\circ}C$), refrigerator (4$^{\circ}C$), and room temperature ($25^{\circ}C$)]. Phytic acid effectively inhibited lipid peroxidation in beef round, chicken breast, halibut, and pork loin muscle (p<0.05). The inhibitory effect of phytic acid was dependent on concentration, storage time, and temperature. At frozen temperature, the inhibitory effect of phytic acid was minimal, whereas at room temperature, the inhibitory effect of phytic acid was maximal, probably due to the variation of the control TBARS values. At the concentration of 10 mM, phytic acid completely inhibited lipid peroxidation in all the muscle foods by maintaining TBARS values close to the level of the controls, regardless of storage time or temperature (p<0.05). The rate of lipid peroxidation was the highest in beef round muscle, although they had a close TBARS value at 0 day. Addition of phytic acid to lipid-containing foods such as meats, fish meal pastes, and canned seafoods may prevent lipid peroxidation, resulting in improvement of the sensory quality of many foods and prolonged shelf-life.

• 한국식품영양학회지
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• 제33권5호
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• pp.505-511
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• 2020

In this study, hot water and ethanol, acetone, and hexane extracts of the steamed Deodeok were investigated for use as raw materials for natural cosmetics. Hot water and ethanol, acetone and hexane extracts of steamed Deodeok did not indicate cell toxicity up to 300 ㎍/mL concentration in the MTT assay. The tyrosinase inhibition effects of the ethanol extract were higher than the ascorbic acid. The efficacy of the steamed Deodeok's ethanol extract on the elastase inhibition was similar to that of quercetin at higher concentrations. In conclusion, water, ethanol, acetone and hexane extracts of the steamed Deodeok indicated strong possibility as a whitening and anti-wrinkle functional cosmetic ingredient. Among them, the steamed Deodeok's ethanol extract, which showed excellent activity, is highly available because it has high safety compared to other organic solvent extraction methods used in cosmetics, and has minimal irritation to the skin.

• 한국식품조리과학회지
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• 제26권2호
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• pp.206-213
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• 2010

In this study, the antibacterial activities of essential oil from Zanthoxylum schinifolium against four Gram-positive bacteria and six Gram-negative bacteria were investigated. The antibacterial activity of the oils was determined using the agar-well diffusion assay, MIC (minimum inhibitory concentration) and MBC (minimum bactericidal concentration). In particular, essential oil from Z. schinifolium showed higher antibacterial activity against Gram-positive bacteria than against Gram-negative bacteria. Essential oil from Z. schinifolium displayed large inhibition zones especially against Bacillus cereus (31 mm). At concentrations between 0 and $20\;{\mu}g/mL$ the oils showed an antibacterial effect against both Gram-negative and Gram-positive bacteria. The minimum inhibitory concentration (MIC) values against nine bacteria ranged from 1.25 to $5\;{\mu}g/mL$. The minimum bactericidal concentration (MBC) values against eight bacterial ranged from 2.5 to $20\;{\mu}g/mL$, except Shigella sonnei. Furthermore, our finding on the antibacterial activities of essential oils from Zanthoxylum schinifolium validated the use of this plant for medical purposes.

• 생명과학회지
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• 제16권2호
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• pp.310-314
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• 2006

대파(Allium fistulosum L)는 백합과 다년초로서 한국, 일본 중국 등 전 세계적으로 식용으로 재배되어 왔다. 현재까지 대파의 다양한 생리활성이 보고되어 왔으나, 항균 활성에 대해서는 거의 보고되어 있지 않다. 본 연구에서는 대파 식용부위로부터 강력한 항미생물성 steroidal saponins (fistuloside A, B, 및 C)을 분리하였고, 이들의 항균력을 병원성균 및 식품부패균을 대상으로 평가하였다. Fistuloside A 및 C는 강력한 항진균 활성과 항Proteus 세균활성을 나타낸 반면, fistuloside B는 항진균 활성만 인정되었다. 특히 fistuloside C는 $3.1{\sim}6.2{\mu}g/ml$의 MIC (minimal inhibitory concentration) 및 MFC (minimal fungicidal concentration)를 나타내어 강력한 항진균 활성이 진균사멸에 의한 항균효과임을 확인하였다. 본 연구결과는 대파가 미생물 감염증 제어용으로 사용되어 온 근거를 제시하며, 또한 fistuloside C의 항진균제로서의 이용 가능성을 제시하고 있다.

• 한국균학회지
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• 제23권2호통권73호
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• pp.153-160
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• 1995

담자균류의 하나인 잔나비걸상 자실체로부터 얻은 수성엑스의 항세균 시험과 항진균 시험을 액체배지 희석법으로 실시하고 naringenin과의 병용시험을 checkerboard assay 법으로 평가하였다. 항세균 시험결과 전반적으로 그람음성균보다 그람양성균에 대해 비교적 양호한 항균력을 나타내었으나 사용된 균주중 그람음성균인 Proteus vulgaris 78615는 MIC가 1.125 mg/ml로 가장 양호한 항균효과를 나타내었다. 11종의 균주에 대해 실시된 항진균 시험결과 Candida albicans, Fusarium spp. 그리고 Trichophyton mentagraphytes의 MIC가 7.5 mg/ml로 다른 균주에 대한 항진균 효과보다 두배 더 강한 효과를 나타내었다. naringenin과의 병용시험에서 Staphylococcus aureus ATCC 25923에 대하여 부분적 상승효과를 나타내었고, Klebsiella pneumoniae ATCC 10031과 Salmonella typhi ATCC 6229 두 균주에서 상가효과가 관찰되었다. 그리고 Bacillus subtilis ATCC 6633을 비롯한 7종의 균주에서 무관효과를 나타내었으며 길항효과는 관찰되지 않았다.