• KSBB Journal
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• 제18권1호
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• pp.1-7
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• 2003

항진균제로 잘 알려진 아졸계 화합물인 이트라코나졸 전구체에 대한 광학선택성 lipase 생산균주 탐색을 수행하였다. 본 라세믹 기질을 선택적으로 가수분해하는 lipase 생산균주 인 Acinetobacter sp. SY-01 를 분리하였고, 효소 가수분해반응을 수행한 결과 본 라세믹 기질은 전환율이 74.8%에 도달하였을 때 95.6%의 ee값을 가지는 S-ester로 분할되었다. 전환율은 온도 $50^{\circ}C$, pH 7.0에서 가장 높게 나타났고, 광학선택성은 온도, pH에 의해 영향을 받지 않았다. 용매의 첨가에 의해 전환율은 감소하였으나 광학선택성은 약간 증가하였다. 기질농도가 증가함에 따라 광학선택성은 감소하였고, 이것은 가수분해반응 생성물에 의한 영향으로 확인되어 반응 생성물을 제거함으로써 광학선택성을 증가시킬 수 있었다.

• 한국식품과학회지
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• 제29권3호
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• pp.546-554
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• 1997

본 연구에서는 난백분말 3% (w/v)와 포도당 2% (w/v)에 4종의 유제품 4% (w/v)를 각각 첨가하여 기질을 만들고 젖산균(Lactobacillus)으로 발효하여 호상의 요구르트를 만든 후, 첨가된 유제품이 젖산균의 생육과 산생성 및 요구르트의 품질(관능성, 휘발성 향기 성분)에 미치는 영향을 조사하였다. L. acidophilus로 24시간 발효된 시료의 경우, 산도는 우유 시료(대조군)에 비하여 유제품 첨가 시료가 유의적으로 낮았으며(p<0.05), 유제품 첨가 시료 가운데는 카제인 시료의 산도가 가장 낮았다. 생균수는 우유 시료가 $2.0{\times}10^{9}/mL$인데 비하여 유제품 첨가 시료는 $5.0{\times}10^{8}{\sim}8.0{\times}10^{8}/mL$으로 현저하게 낮았다. L. acidophilus로 16.5시간 발효시켜 만든 호상요구르트의 관능성을 보면, 전반적인 기호도는 우유요구르트(표준시료)보다 유제품 첨가 시료가 저조하였으나 카제인 시료의 경우는 표준시료와 유의적인 차이를 보이지 않았으며(p<0.05), 유제품 첨가 시료 중에서는 유청 시료의 관능성이 가장 저조하였다. 본 실험에서 사용된 L. acidophilus (KCTC 2182)는 시료에 따라서 다소 차이가 있으나 발효 과정에 acetone, ethanol, diacetyl, acetoin을 생성하였다.

• 한국염색가공학회지
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• 제15권5호
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• pp.294-300
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• 2003

The anionic agent containing dichloro-s-triazinyl reactive group was synthesized and applied to the cotton fabrics to introduce covalent bonds. This attempt was expected to improve the affinities of cationic compounds, such as cationic dyes, chitosan, quaternary ammonium antimicrobial agents and metal ions, by the electrostatic attractive force. As expected, the anionic agent was reacted with cotton fabrics at room temperature. In order to examine the adsorptivity of the cationic compounds on to the anionized cotton fabrics, firstly a cationic dye(C. I. Basic Violet 7) was applied. The color strength of the dyeing of anioized cotton fabric was highly increased comparing to that of untreated fabric.

• Bulletin of the Korean Chemical Society
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• 제32권1호
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• pp.131-136
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• 2011

Synthesis of N-(1H-benzimidazol-2-yl)-6-substituted-1,3-benzothiazol-2-amines and 6-substituted-N-(4,5-dihydro-1H-imidazol-2-yl)-1,3-benzothiazol-2-amines by the reaction of substituted 2-aminobenzothiazoles with carbon disulphide and methyl iodide followed by the reaction with o-phenylene diamine/ethylene diamine are reported. All the synthesized compounds were characterized by elemental analysis, IR spectra and $^1H$ NMR spectral studies. The potent antibacterial and entomological (antifeedant, acaricidal, contact toxicity and stomach toxicity) activities of the synthesized compounds were investigated.

• 한국미생물·생명공학회지
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• 제49권3호
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• pp.346-355
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• 2021

Ngoc Linh ginseng is one of the most valuable endemic medicinal herbs in Vietnam. In this study, Ngoc Linh ginseng callus was fermented by Lactobacillus plantarum ATCC 8014 (at 6, 7, and 8 log CFU/ml) to evaluate the extraction efficiency of bioactive compounds. The post-fermentation solution was spray-dried using maltodextrin with or without Stevia rebaudiana (3% and 6% v/v) as the wall material. Bioactive compounds such as polyphenols, polysaccharides, and total saponins, and L. plantarum viability during fermentation and after spray-drying, as well as under simulated gastric digestion, were evaluated in this study. The results showed that probiotic density had a significant effect on bioactive compounds, and L. plantarum at 8 log CFU/ml showed the best results with a short fermentation time compared to other tests. The total content of polyphenols, polysaccharides, and saponins reached 5.16 ± 0.18 mg GAE/g sample, 277.2 ± 6.12 mg Glu/g sample, and 4.17 ± 0.15 mg/g sample, respectively after 20 h of fermentation at the initial density of L. plantarum (8 log CFU/ml). Although there was no difference in the particle structure of the preparation, the microencapsulation efficiency of the bioactive compound in the samples containing S. rebaudiana was higher than that with only maltodextrin. The study also indicated that adding S. rebaudiana improved the viability of L. plantarum in gastric digestion. These results showed that S. rebaudiana, a component stimulating probiotic growth, combined with maltodextrin as a co-prebiotic, improved the survival rate of L. plantarum in simulated gastric digestion.

• Archives of Pharmacal Research
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• 제27권11호
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• pp.1099-1105
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• 2004

The peroxisome proliferator-activated receptors (PPARs) are a primary regulator of lipid metabolism. Potency for activation of PPAR$\gamma$, one of a subfamily of PPARs, particularly mirrors glucose lowering activity. We prepared thiazolidinediones featuring benzoxazole moiety for subtype selective PPAR$\gamma$ activators. 5-[4-[2-(Benzoxazol-2-yl-alkylamino)ethoxy]benzyl]thiazolidine-2,4-diones have been prepared by Mitsunobu reaction of benzoxazolylalkylaminoethanol 8 and hydroxybenzylthiazolidinedione 6 and their activities were evaluated. Most compounds tested were identified as potent PPAR$\gamma$ agonists.

• 대한화학회지
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• 제52권1호
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• pp.30-35
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• 2008

연구의 목적은 N1과 6번 자리에 다른 치환기를 가진 5-cyano가 치환된 pyrimidine 아날로그의 새로운 시리즈의 합성과 그것들의 항균성과 항진균성의 활성도에 대해 평가하기 위해서이다. 이 화합물은 MORE technique 를 이용한 potassium carbonate 의 존재하에서 ethylcyanoacetate, 치환된 thioureas, 적당한 알데히드의 제 3차 축합으로 합성 되어졌다. 항균성과 항진균성의 활성도는 25 mg의 농도에서 cup-plate 방법으로 측정되었다. 억제구역은 mm로 측정 되어졌다. 모든 화합물은 좋은 항균성과 항진균성을 보여주었다. P1과 P5는 S.aureus과 E.coli에 대해 최대 활성도를 보여주었고, P6은 모든 종류의 미생물에 대해 좋은 활성도를 보여주었다. P8 화합물은 C. albicans 에 대해 좋은 효과가 있음을 알아냈다. Norfloxacin와 griseofulvin는 합성된 화합물의 활성도와 비교되는 기준물질로 사용되었다. 6번 자리에 p-hydroxy와 p-methoxy로 치환된 phenyl moiety를 가진 gram-양성 미생물에 대해 강력했고, 6번 자리에 이것들이 없는 phenyl moiety 를 가진 아날로그는 gram-음성 활성도를 가졌다,6번 자리에 p-dimethylamino로 치환된 phenyl moiety를 가진 화합물은 적당한 활성을 보여준다.. 게다가 N1자리에서 단지 fluorine을 포함한 아날로그는 상당한 항진균성을 가졌음을 밝혀냈다. N1자리에서 aryl moiety 의 전자 끌게 치환과 마찬가지로 전자 주게 치환은 화합물의 결정된 능력에 중요한 역할을 함을 제시한다.

• 한국미생물·생명공학회지
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• 제22권6호
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• pp.685-691
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• 1994

The biodegradation of aromatic compounds by mixed and monoculture was investigated in an artificial wastewater containing 500 mg/l of benzene(B), phenol(P), and toluene(T) in various combinations. None of three strains utilized P-xylene(X) as a carbon source, but they grew well on p-xylene in mixtures with benzene and toluene. In the mixed culture on mixed substrate, the length of lag phase was different depending on the nature of mixture. Cell growths of Flavobac- terium sp. BEN2 and Acinetobacter sp. GEM63 were inhibited in the presence of a 500 mg/l of phenol. When the mixed culture of three strains was cultured in a bench-scale reactor containing artificial wastewater, each of benzene, phenol, and toluene was not detected at 30 hrs, 50 hrs, and 12 hrs after incubation in the treatment. The removal rates of COD$_{t}$(total COD) and COD$_{s}$,(soluble COD) of upper phase after centrifugation during early 50 hrs were ca. 80% and ca. 93.8%, respectively.

• 약학회지
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• 제38권6호
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• pp.627-636
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• 1994

Several Pt(II) and Pt(IV) complexes of N,N'-bis(2-hydroxyethyl)ethylenediamine(2-HEen) and N,N'-bis(2-chloroethyl) ethylenediamine(2-CEen) as carrier ligand were prepared. Water soluble Pt complexes were also synthesized by modification of leaving groups. The cytotoxicity of these compounds against leukemia L1210 and P388 cell in vitro were examined. The Pt complexes containing 2-CEen showed more effective cytotoxicity than those containing 2-HEen. Through the nephrotoxicity tests on the primary cultured proximal tubular cells of rabbit kidney and human kidney cells in vitro, Pt complexes with 2-CEen showed higher than those with 2-HEen which were consistent with cytotoxicity but showed very low nephrotoxicity compared with cisplatin. Also the values of BUN and creatinine in serum of Pt complexes were reduced remarkably compared with cisplatin, therefore it can be concluded that new Pt complexes seems to have much lower nephrotoxicity than cisplatin.

• Bulletin of the Korean Chemical Society
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• 제18권3호
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• pp.328-333
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• 1997

Dicyanovinyl-containing bis-hydroxy monomers, p-bis[1-(4-hydroxypiperidinyl)]-2,2-dicyanovinyl]benzene (2), p-bis[1-[1-(2-hydroxyethyl)piperazinyl]-2,2-dicyanovinyl]benzene (3), p-bis[1-(4-hydroxyphenylamino)-2,2-dicyanovinyl]benzene (4) and p-bis[1-[N-methyl-(N-hydroxyethyl)amino]]-2,2-dicyanovinyl]benzene (5) were prepared from p-bis(1-chloro-2,2-dicyanovinyl)benzene (1) and the corresponding amino alcohol. The poly(enaminonitriles-ester)s with a variety of chemical structures in the main chain were prepared from them. The chemical structure of polymers was confirmed through the syntheses of their corresponding model compounds. The polymers are easily soluble in polar aprotic solvents such as DMF, DMSO and NMP. Brittle and hard films can be cast from DMF solutions of polymers. Most polymers showed a large exotherm in DSC analyses and undergo a curing reaction around 350 ℃ to form insoluble materials. The polymers consisting of rigid aromatic moieties show 80-88% residual weight at 500 ℃ under nitrogen.