• 한국콘텐츠학회논문지
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• 제22권3호
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• pp.567-575
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• 2022

본 연구에서는 국내산 방울토마토의 폴리페놀 및 플리보노이드 함량, 항산화 활성 및 암세포 억제 활성을 알아보았다. Summerking, Qutiquti 및 Minichal 품종의 총 폴리페놀 함량은 각각 12.56±1.88 mg/g, 12.50±1.92 mg/g 및 11.65±1.85 mg/g, 총 플라보이드 함량은 각각 4.58±1.03 mg/g, 4.19±0.40 mg/g 및 4.30±0.49 mg/g이었다. DPPH 및 ABTS radical 소거활성 측정을 통한 항산화 활성 측정 결과 모두 뚜렷한 항산화활성을 나타내었다. 암세포 억제 활성을 알아본 결과 세가지 품종 모두 정상 간세포(Chang)에 대한 세포독성은 관찰되지 않았고 자궁경부암세포(HeLa)에 대해서는 강한 억제 활성을 보였다. 간암세포(HepG2)에 대해서도 생육억제 효과가 확인되었다. 본 연구를 통해 국내산 방울토마토의 생리활성 식품소재로서의 유용성이 밝혀졌다.

• 한국콘텐츠학회논문지
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• 제20권2호
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• pp.451-461
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• 2020

본 연구는 황색 방울토마토의 일반성분, 생리활성 성분의 분포를 규명함으로써 식품재료로서의 활용가치를 알아보기 위해 실험하였다. 17종의 유리아미노산이 발견되었고 그 중 L-글루탐산(45.15%), L-글루타민(22%) 및 L-아스파르트산(11%)이 주된 아미노산이었다. 또한, 필수아미노산 중 L-트립토판을 제외한 8종의 필수아미노산이 포함되어 있었다. 아미노산 대사산물 중 생리활성이 잘 알려진 γ-aminobutyric acid(GABA)가 258.58 mg/100 g 다량 포함되어 있었다. Lycopene(2.18 mg/100 g) 함량은 붉은 토마토에 비해 상대적으로 적었으나 β-carotene(9.90 mg/100 g)은 상대적으로 많이 함유되어 있었다. 또한, naringenin chalcone, quercetin-3-rutinoside(rutin), 5-caffeoylquinic acid, 3-caffeoylquinic acid, quercetin-3-apiosylrutinoside 등 다양한 기능성을 갖는 폴리페놀 화합물이 발견되었다. 이와 같은 결과를 통해 황색 방울토마토가 영양적으로 우수한 식품소재이며 생리활성 성분의 급원으로 기능성 식품 소재로서의 활용성도 매우 크다는 것을 알 수 있었다.

• 한국세라믹학회지
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• 제40권6호
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• pp.601-607
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• 2003

재료의 선택에 따른 생체친화성을 고찰하기 위해서 조골세포의 세포배양실험을 실시하였으며, 이로부터 세포의 부착형상, 증식, 분화의 정도를 살펴보았다. 본 실험에서 세포배양모재는 체내식립재료로 주목을 받고 있는 TiO$_2$, 3Y-TZP, HA (Hydroxyapatite) 그리고 Ti를 사용하였으며 대조군으로 Thermanox를 선택하였다. 일반적으로 모든 시편들은 같은 세포배양시간일때 거의 유사한 세포부착형상을 보였다. 그러나, HA위의 세포들은 나머지 시편들보다 좀 더 두꺼운 형상을 보였으며 빠른 세포의 부착 및 퍼짐으로 인한 overlapping이 자주 관찰되었다. 세포의 증식 및 분화의 경우에도 생체활성의 특성을 지니는 HA가 가장 높은 값을 보였으며 생체불활성재료인 경우에는 Ti, TiO$_2$, 3Y-TZP모두 유의한 차이를 보이지 않고 비슷한 경향을 나타내었다.

• Bulletin of the Korean Chemical Society
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• 제35권7호
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• pp.2049-2056
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• 2014

A simple method for exfoliating pristine graphite to yield mono-, bi-, and multi-layers of graphene sheets as a highly concentrated (5.25 mg/mL) and yielded solution in an organic solvent was developed. Pre-thermal treatment of pristine graphite at $900^{\circ}C$ in a sealed stainless steel bath under high pressures, followed by sonication in 1-methyl-2-pyrrolidinone solvent at elevated temperatures, produced a homogeneous, well-dispersed, and non-oxidized graphene solution with a low defect density. The electrical conductivities of the graphene sheets were very high, up to 848 S/cm. These graphene sheets were used to fabricate graphene-polyimide nanocomposites, which displayed a higher electrical conductivity (1.37 S/m) with an improved tensile strength (95 MPa). The synthesized graphene sheets and nanocomposites were characterized by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy.

• Natural Product Sciences
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• 제23권3호
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• pp.157-161
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• 2017

Reserpine is a well-known medicine for the treatment of hypertension, however the role of reserpine in cell signaling is not fully understood. Here, we report that reserpine treatment induces the phosphorylation of AMP activated protein kinase (AMPK) at threonine 172 (T172) in PC12 cells. Phosphorylation of AMPK T172 is regulated by upstream signaling molecules, and the increase of phospho-T172 indicates that AMPK is activated. When we examined the FOXO3a dependent transcription by using the FHRE-Luc reporter assay, reserpine treatment repressed the FHRE-Luc reporter activity in a dose dependent manner. Finally, we showed that reserpine treatment induced the phosphorylation of AMPK as well as cell death in MCF-7 cells. These results suggest that AMPK is a potential cellular target of reserpine.

• Mass Spectrometry Letters
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• 제14권1호
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• pp.9-23
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• 2023

Plants are able to produce a large number of diverse bioactive compounds. Solvent extraction is used for isolation of plant metabolites. The extract yield for plant metabolite extraction strongly depends on the nature of solvent. A review showed the methanol can yield more bioactive compounds. Drying of the sample material is also important for the extraction of plant material. The present study was carried out to analyze the phytocomponents of 5 different latex producing plants. The plants like Calotropis gigantea, Carica papaya, Nerium oleander, Ficus benghalensis and Plumeria alba leaves and latex. The GC-MS analysis of the metabolites revealed phytocomponents. Calotropis gigantea leaves showed 14 compounds and latex produced 5 compounds out of this 4,4,6A,6B,8A,11,11,14B-Octamethyl-1,4,4A,5,6,6A,6B,7,8,8A,9,10,11,12,12A,14,14A,14B-Octadeca-hydro-2 and 2R- Acetoxymethyl-1,3,3-trimethyl-4T-(3-Methyl-2-Buten-1-Yl)-1T-Cyclohexanol compound was present in both latex and leaf extraction. Beta. -carotene compound was present in both latex and leaf of Carica papaya. It was observed that Ficus benghalensis contained 2R-Acetoxymethyl-1,3,3-trimethyl-4T-(3-Methyl-2-Buten-1-Yl)-1T-Cyclohexanol was same in latex and leaf extraction.

• 대한치과의사협회지
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• 제48권4호
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• pp.263-274
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• 2010

I classified the bone graft material according to the component. Most bone graft material is composed of inorganic and organic constituent. Organic component such DBM is associated with osteoinduction. Inorganic components such as hydroxyapatite, $\beta$-TCP, calcium sulfate, bioactive glass, polymer are associated with osteoconduction. Autogenous bone graft is ideal material. We can select any biocompatible material for the restoration of small filling defect with intact bony wall. However, we should select first osteogenetic and osteoinductive material to regenerate the viable bone tissue.

• Bulletin of the Korean Chemical Society
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• 제27권7호
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• pp.986-990
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• 2006

As key nucleoside intermediates for the preparation of cyclic adenosine diphosphate ribose (cADPR, 1) analogues, 8-alkyl-2' (or 3')-azido(or amino)-adenosine derivatives (16-19) were successfully prepared by alkylating selectively protected adenosine derivatives (12, 13) via Pd(0) catalyzed cross-coupling reaction with tetraalkyltin reagents, followed by the sugar modification of these 8-alkyl-adenosine derivatives according to our precedent procedure. Compared to other precedent procedures, our 8-alkylation methodology using selectively TBDMS-protected 8-alkyl adenosine derivatives as starting materials will be utilized very conveniently to prepare highly functionalized adenosine analogues, which will be serve as key intermediates for the cADPR.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2011년도 춘계학술발표대회
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• pp.53.1-53.1
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• 2011

Bioactive glass powders were synthesized by hydrothermal chemical route by the use of ultrasonic energy irradiation. We used sodalime, calcium nitrate tetra hydrate and di ammonium hydrogen phosphate as the precursor material to synthesize $SiO_2$ rich bio-active glass materials. The $SiO_2$ content was varied in the precursor mixture to 60, 52 and 45 mole%. Dense compacts were obtained by microwave sintering at $1,100^{\circ}C$. Mechanical properties were characterized for the fabricated dense bioactive glasses and were found to be comparable with conventional CaO-$SiO_2$-$Na_2O$-$P_2O_5$ bioactive glass. Detailed biocompatibility evaluation of the glass composition was investigated by in-vitro culture of MG-63 cell and mesenchyme stem cell. Cell adhesion behavior was investigated for both of the cell by one cell morphology for 30, 60 and 90 minutes. Cell proliferation behavior was investigated by culturing both of the cells for 1, 3 and 7 days and was found to be excellent. Both SEM and confocal laser scanning microscopy were used for the investigation. Western blot analysis was performed to evaluate the bimolecular level interaction and extent and rate of specific protein expression. The ability to form biological apatite in physiological condition was observed with simulated body fluid (SBF). In-vivo bone formation behavior was investigated after implanting the materials inside rabbit femur for 1 and 3 month. The bone formation behavior was excellent in all the bioglass compositions, specially the composition with 60% $SiO_2$ content showed most promising trend.

• 대한약학회:학술대회논문집
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• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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• pp.302.2-303
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• 2003

For polymeric material for tissue engineering. chitosan was selected with benefit of high tissue compatibility attributed and wound healing through its activation of growth factors. And nonwoven chitosan fibrous matrix has well interconnected porosity. But chitosan itself has some of limitations in including rapid bone regeneration at initial states incorpor-ated of bioactive materials such as growth factors and ECM molecules. (omitted)