• 한국세라믹학회지
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• 제32권10호
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• pp.1093-1102
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• 1995

Water-soluble phosphate glasses containing Ag or Cu ion were prepared through melting process. Then the powdered glass samples were dissolved in D.I. water at room temperature with changing the dissolution time. In terms with the glass composition, dissolution characteristics, bactericidal effects and cytotoxicities were investigated. Dissolved amounts increased uniformly with dissolution time, and the dissolution rate was higher for ternary glass than for binary glass and with less metal oxide amount. And the dissolution rate of the glass with Ag ion was higher than that with Cu ion, and the bactericidal effect of the glass with Ag ion was also greater. Solution with more than 25 ppm of Ag was observed to have strong cytotoxicity to L929, and solutions of lower Ag concentration or with Cu seemed to have little cytotoxicity.

• 한국세라믹학회지
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• 제34권1호
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• pp.13-22
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• 1997

은 이온과 구리 이온을 동시에 함유하는 살균용 인산염계 수용성 유리를 용융법으로 제조하였다. 분말상의 유리 시편을 상온의 증류수에 넣어 조성과 시간에 따른 용해 특성을, bulk상 시편에 대해서는 용해 전.후의 표면변화를 각각 관찰하였고, 살균 효과 및 세포독성을 평가하였다. 은 이온:구리 이온=1:1인 조성에서 최대 용해량을 나타내었으며 용해거동은 초기부터 total dissolution이 지배적이었다. 시간의 경과에 따라 용해는 진행이 되지만, 표면에 생성되는 새로운 층은 관찰되지 않았다. Pseudomonas sp, e. coli, staphylococcus aureus, 및 salmonella균에 대한 살균 효과는 용해량의 증가에 따라 증가하여 우수한 살균효과를 나타내었다. L929 세포에 대한 독성 실험 결과, 은 이온의 농도가 10ppm이상에서만 독성을 나타내었다.

• 대한토목학회논문집
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• 제35권4호
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• pp.791-799
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• 2015

본 연구는 수중 구조물의 수명과 조류의 성장이 관계가 있다는 연구결과에 근거하여 조류의 이상증식 억제가 구조물에 영향을 미칠 수 있다는 것에 초점을 맞추었다. 따라서 본 연구는 조류의 활용을 극대화시키면서 조류로 인한 문제점을 억제할 수 있도록 조류의 생장을 억제할 수 있는 기능성 모르타르 개발을 목적으로 하였다. 조류의 생장을 억제하기 위한 방법으로 금속 ion(Hg+, Ag+, Cu2+, Au+ 등)은 조류의 생장을 억제하는 물질로 오래전부터 사용되어져왔다. 이에 착안하여 수중에 용출되었을 때 유효한 금속 ion의 상태로 장시간에 걸쳐 안정한 수용성 유리를 사용하여 조류의 생장을 억제할 수 있는 기능성 모르타르 시편을 제작하였다. 제작된 모르타르 시편은 시편의 억제 기능성을 평가하기 위해 해수와 담수에 생장하는 일반적인 조류를 배양시킬 수 있는 배지를 각각 제작한 다음 개발된 모르타르 시편을 투입한 후 일정기간이 지난 뒤 배지에 잔류하는 조류의 양을 측정함으로써 개발된 모르타르 기능성을 판단하였다. 조류의 양을 측정하기 위하여 사용된 분석은 용존 유기탄소(dissolved organic carbon)의 양과 엽록소(chlorophyll)의 양을 측정하는 두 가지 분석 결과를 이용하였으며 분석을 통해 나온 결과는 개발된 시편의 조류 억제 기능성에 대하여 정성적인 평가를 하였다. 즉, 용존 유기탄소의 양이 증가하고 엽록소의 양이 감소하면 조류에 대한 생장 억제성이 있는 것으로 판단하였다. 두 가지 분석 결과, 해수와 담수 모두 조류 생장 억제용 모르타르는 억제 기능성이 나타나고 있었다.

• 한국세라믹학회지
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• 제35권4호
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• pp.319-324
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• 1998

Sol-gel derived phosphate water-sioluble glasses containing Cu were prepared. Powder-shape of glasses were added in D.I water used polyethylene bottle. After solution contained glass powder were submerged in water bath on 25$^{\circ}C$ their dissolution behavior/characteristics bactericidal effect and cytotoxicity test were evaluated. The maximum amount of Cu(35 mol%) via sol-gel method was more 5 mol% increased than that with melting process. The stage of total dissolution was more dominant than that of selective leaching dur-ing dissolution due to dissolved amount of glasses increased linearly with time. The ratio of Cu+ to {{{{ {Cu }^{2+ } }} was 3:7 so that the structure of glasses is more predominant 2-dimension chain structure than 3-dimenshion po-lymeric structue. The stage of total dissolution was more dominant than that of selective leaching during dissolution. Bactericidal effect against all bacteria showed that solutions which contained 40 ppm and 100 ppm of Cu killed 80 percentages of bacteria within 2 hours and 100 percentages of those within 12 hours. The results of cytotoxicity test for L929 cells showed no cytotoxicity were observed within 96 hours for dis-solved solution that contains 40 ppm and 100 ppm of Cu.

• 한국재료학회지
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• 제12권7호
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• pp.545-549
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• 2002

Potassium-Calcium-Phosphate glasses in range $XCaO\cdot(50-X)K_2O$ \cdot $50P_2$$O^{5}$were investigated. Glass transition temperature(Tg) of prepared glasses were below $520^{\circ}C$, thermal expansion coefficient from $270.3$\times$10^{7}$ to $604.5$\times$10^{7}$/$^{\circ}C$. The structure of XCaO.(50-X)$K_2$O\cdot$50P_2$$O^{5}$ glasses were examined by FT-IR spectroscopy indirectly. As CaO was increased, Ts, Tg, P-O-P bonding strength and chemical durability were increased. Glass surface change was observed with increasing dissolution time using bulk specimen, weight loss and pH change were measured as function of the dissolution time.

• Food Science and Biotechnology
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• 제18권6호
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• pp.1487-1494
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• 2009

The effects of drying temperature (55, 60, and $65^{\circ}C$) and addition levels of maltodextrin (MD) (10, 20, and 30%) on the physicochemical properties and nutritional quality of purple sweet potato flour were investigated. MD-added flours had higher $L^*$ values, water soluble index, total phenolic, and anthocyanin contents than untreated flour. However, $a^*$, $b^*$ values, water absorption index, and swelling capacity were dependent on the drying temperature and MD concentration. On the other hand, untreated flour had a higher ascorbic acid content compared to the MD-treated flour. Ascorbic acid contents decreased, whereas anthocyanin content was not significantly different, with increasing drying temperatures. MD was positively correlated with phenolic content, anthocyanin, hue angle, and water soluble index. However, there was no correlation between quality parameters and glass transition temperature. The best quality product was obtained when samples were pretreated with MD before drying, regardless of drying temperature.

• Ecology and Resilient Infrastructure
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• 제5권2호
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• pp.82-87
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• 2018

Proliferation of algae on the surface of concrete or mortar in aquatic habitat has a negative impact on maintenance of concrete-based structures. Growth of algae may decrease stability of structure by bio-deterioration. In this study, we developed a functional mortar for restraining bio-deterioration by using $Cu^{2+}$ ion. The mortar contains soluble glass beads made of $Cu^{2+}$ ion, which can dissolve into water slowly. Mortars prepared with different ratio of glass beads (0, 2, 5, 10, and 15%) were placed in a culture medium with algae and incubated over a month period. Water chemistry, chlorophyll-a, and extracellular enzyme activities were measured. The incubation was conducted in both freshwater and seawater conditions, to assess applicability to both aquatic conditions. Overall, mortar with Cu glass exhibited lower chlorophyll-a content, suggesting that the functional mortar reduced algal growth. DOC concentration increased because debris of dead algae increased. Cu glass also decreased phosphatase activity, which is involved in the regeneration of inorganic P from organic moieties. Since, P is often a limiting nutrient for algal production, algal growth may be inhibited. Activities of ${\beta}$-glucosidase and N-acetylglucosaminidase were not significantly affected because carbon and nitrogen mineralization may not be influenced by the Cu glass beads. Our study suggests that functional mortar with Cu glass beads may reduce the growth of algae on the surface, while it has little environmental impact.

• 한국세라믹학회지
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• 제38권11호
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• pp.1060-1066
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• 2001

세라믹 인공치관으로 응용을 위해 생체친화적이며 용매에 용해가 잘되고 연소 후 잔류물이 남지 않는 결합제인 PVP로 수계용 알루미나 테이프를 제조하였다. 알루미나 테이프의 인장강도는 결합제(b)와 가소제(p)의 비(b/b+p))에 의해, 그리고 소결체 수축과 밀도는 알루미나(a)와 유기물(o)의 비 (a/(a+o))에 의해 영향을 받았다. 소결된 가공성 알루미나 테이프에 유리를 침투시켜 강화된 세라믹 인공치관용 복합체의 강도는 소결밀도가 증가할수록 높은 값을 보였다.

• 한국세라믹학회지
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• 제31권10호
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• pp.1218-1230
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• 1994

In manufacturing process of porous glass-ceramics by the filler method, the sintering behaviour of crystallizable glass powder mixed with various salts was studied and also the effects of precipitated crystal phases on the properties of porous glass-ceramics were investigated. Fine-grained crystallizable glass powder was homogeneously mixed with various slat having grain size 100~200 ${\mu}{\textrm}{m}$ and sintered for densification. After washing out the inorganic salt with distilled water, the porous sintered body was heat treated additionly for crystallization. The MgO-Al2O3-SiO2 base glass was used as crystallizable glass powder and the water soluble salts such as K2SO4 and MgSO4 were used as filler. When K2SO4 was used, leucite crystal phase was formed as a result of the ion exchange and porous glass-ceramics which exhibit high temperature resistance and high thermal expansion coefficient of 17$\times$10-6/$^{\circ}C$ could be obtained. On the contrary, when MgSO4 was used, only slight ion exchange is observed and $\mu$-cordierite and $\alpha$-cordierite crystal phases were formed and porous glass-ceramics which exhibit low thermal expansion coefficient schedule were determined with the results of DTA curves, thermal shrinkage curves and XRD patterns analysis. From DTA curves and thermal shrinkage curves, it was found that the sintering densification have been completed at the temperature range of exothermic peak for crystallization. The pore size distributions and pore diameters were measured by mercury porosimeter. The pore diameter of porous glass-ceramics was 10~15 ${\mu}{\textrm}{m}$ when 100~200${\mu}{\textrm}{m}$ grain size of K2SO4 was used and it was 25~30 ${\mu}{\textrm}{m}$ when the same grain size of MgSO4 was used. The porous glass-ceramics K2SO4 used shows bimodal pore size distribution and its porous skeleton structure was ascertained by SEM observation.

• 한국식품위생안전성학회지
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• 제35권4호
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• pp.398-410
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• 2020

본 연구에서는 13종의 밥류, 11종의 면류, 그리고 15종의 소스류에 함유되어 있는 수용성 비타민 B₁ (thiamin), B₂ (riboflavin), 그리고 B₃ (niacin)의 함량을 확인하였다. 실험 결과에 대한 신뢰도를 확인하기 위해 검출한계(LOD)와 정량한계(LOQ)를 확인하였으며, 표준인증물질(SRM 1849a)을 통한 결과의 정확도를 확인하여 우수한 지표를 나타내었다. Thiamin에서 밥류의 경우 잡채밥이 가장 높은 함유량을 확인하였고, 면류의 경우 막국수, 그리고 소스류의 경우 토마토 스파게티소스가 가장 높은 함유량을 확인하였다. Riboflavin은 밥류의 경우 짜장밥, 면류의 경우 비빔국수, 소스류의 경우 강황카레 약간 매운맛에서 가장 높은 함유량을 확인하였다. Niacin에서는 밥류, 면류, 그리고 소스류에서 각각 치킨볶음밥, 잔치국수, 짜장소스에서 가장 높은 함유량을 확인하였다. 한국인 성인 남녀의 수용성 비타민 1일 섭취권장량에 대하여 식품에 함유되어 있는 양을 확인한 결과 강황카레 약간 매운맛에서 가장 높은 riboflavin의 함량이 남자의 경우 217.40%, 여자의 경우 271.75%로 가장 높은 함량을 확인하였다. 본 연구를 통해서 밥류, 면류, 그리고 소스류에 함유된 수용성 비타민에 대한 영양성분 데이터베이스를 구축하고, 1일 섭취권장량에 대한 식품에 함유된 수용성 비타민의 함량 확인을 통해 국민 식생활에 필요한 자료를 제공하고자 한다.