• Natural Product Sciences
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• 제9권4호
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• pp.304-306
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• 2003

Two new protolimonoids, piscidenone (1) and piscidinol G (2) were isolated from the leaves of the plant Walsura piscidia together with piscidinol A and C. The structurers were assigned based on spectral evidences (IR, $^1HNMR$, $^{13}CNMR$ and MS).

• Natural Product Sciences
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• 제9권3호
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• pp.192-194
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• 2003

Two new protolimonoids, piscidenone (1) and piscidinol G (2) were isolated from the leaves of the plant Walsura piscidia together with piscidinol A and C. The structurers were assigned based on spectral evidences $(IR,\;^1HNMR,\;^{13}CNMR\;and\;MS)$.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 2007년도 Proceedings of The Convention
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• pp.32-37
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• 2007

• 대한화학회지
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• 제49권3호
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• pp.261-268
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• 2005

• 한국미생물·생명공학회지
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• 제11권3호
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• pp.201-204
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• 1983

Antioxidant, tentatively named PA-29B substance was isolated from the fermentation broth of rare Actinomycetes. It was isolated by means of silica gel column chromatography and obtained as colorless plates, mp 155-157$^{\circ}C$. The structure of PA-29B substance was assigned to be $\alpha$-phenyl acetamide by $^1$HNMR spectrometer and mass spectrometer.

• 미생물학회지
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• 제32권4호
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• pp.306-314
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• 1994

Xylan과 관련 다당류 (xylotriose, xylotetraose, arabinoxylotriose)에 대한 Trichoderma koningii ATCC 26113에서 분리된 xylanase II의 작용양상은 xylanase II가 endo-enzyme이고 transxylosidation의 활성을 가지고 있다고 보여진다. Xylanase II에 의해 형성된 반응산물을 $^1HNMR$ 분광법으로 분석한 결과는 본 효소에 의해 얻어진 xylooligosaccharides의 가수분해산물은 모두가 ${\beta}$-1,4-xylosidic linkage만을 가지고 있는 것으로 판명되었다. 본 효소를 iodoacetamide로 화학적으로 변형시켰을 때 효소 mole당 cysteine 잔기가 두 개가 활성에 필요한 것으로 보여졌으며, N-bromosuccinimide 로 처리하였을 때는 활성부위에 tryptophan 잔기가 여덟 개 존재하는 것으로 판명되었다.

• 분석과학
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• 제36권1호
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• pp.1-11
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• 2023

A new, sensitive, and reliable flow injection methodology was investigated for the determination of lead ion (II) in vegetables' samples using a laboratory-prepared reagent 2-[(6-methoxy-2-benzothiazoly)azo]-4-methoxy phenol (6-MBTAMP). Infrared spectroscopy, UV-visible spectrophotometry, Energy dispersive X-ray spectroscopy (EDX), Elemental Analysis (CHN), nuclear magnetic resonance spectroscopy ¹HNMR, and ¹³CNMR techniques were used to characterize the reagent and lead (II) complex. The method is based on lead ion (II) reacting with the reagent (6-MBTAMP) in a neutral solution to produce a green-red complex with a maximum absorbance at 670 nm. The optimum conditions, such as flow rate, lead ion (II) volume, reagent volume, medium pH, reagent concentration, and reaction coil length were thoroughly examined. The limits of detection (LOD) and quantification (LOQ) were determined to be 0.621 mg·L^-1 and 2.069 mg·L^-1 , respectively, while Sandell's sensitivity was determined to be 0.345 ㎍·cm^-2.

• Bulletin of the Korean Chemical Society
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• 제20권5호
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• pp.543-546
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• 1999

Heme assignment of the 1HNMR spectrum of cytochrome c3 of D. vulgaris Miyazaki F was established [Reference: 12, 13]. The major reduction of the heme turned out to take place in the other of heme 4, 1, 2 and 3 (in the sequential numbering). The Hemes with the smallest and greatest solvent accessibility were reduced at the highest and lowest potentials in average, respectively. A cooperation interheme interaction was attributed to a pait of the closest hemes, namely, hemes 1 and 2. This assignment can provide the physicochemical bases for the elucidation of electron transfer of this protein.

• Advances in materials Research
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• 제3권2호
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• pp.117-128
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• 2014

Processable conducting polyaniline derivative with free amine functional groups was successfully synthesized from the monomer o-phenylenediamine in aqueous hydrochloric acid medium using ammonium persulfate as an oxidative initiator. The synthesized poly(o-phenylenediamine) (PoPD) in critical condition was found to be completely soluble in common organic solvents like dimethyl sulfoxide, N,N-dimethyl formamide etc. From the intrinsic viscosity measurement, the optimum condition for the polymerization was established. The polymer was characterized by ultraviolet visible spectroscopy, Fourier transform infrared spectroscopy, proton magnetic resonance spectroscopy ($^1HNMR$) and thermogravimetric (TGA) analyses. The weight average molecular weights of the synthesized polymers were determined by the dynamic light scattering (DLS) method. From the spectroscopic analysis the structure was found to resemble that of polyaniline derivative with free amine functional groups attached to ortho/meta position in the phenyl ring. However, very little ladder unit was also present with in the polymer chain. The moderate thermal stability of the synthesized polymer could be found from the TGA analysis. The average DC conductivity of $2.8{\times}10^{-4}S/cm$ was observed for the synthesized polymer pellet after doping with hydrochloric acid.

• Bulletin of the Korean Chemical Society
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• 제29권10호
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• pp.1887-1892
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• 2008

Novel poly(aspartic acid) derivatives conjugated with L-lysine moieties and their amphiphilic analogs were synthesized and characterized. The chemical structures of these polymers were confirmed using FT-IR and $^1HNMR$ spectroscopy. The physicochemical properties of amphiphilic copolymers were characterized using an electrophonetic light scattering spectrophotometer (ELS) and transmission electron microscopy (TEM). These results indicated a stable nanoparticle formation within aqueous media. These polymers have potential applications in the pharmaceutical and cosmetic fields as delivery vehicles for bioactive molecules.