• KSBB Journal
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• 제17권4호
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• pp.345-349
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• 2002

항균성 물질이 함유된 투명한 신기능 포장필름의 제조를 위하여 흡착제로서 수용성 silica를 선택하여 항균성 물질의 흡착 및 내열성을 조사하였다. Methanol 자화 방선균 (MO-16, MO-17)이 생산하는 천연 항균성 물질을 ethylacetate로 추출, 농축하여 silica에 흡착시킨 후 열처리한 결과 15$0^{\circ}C$에서 5분까지 항균효과가 유지되었다. 따라서 투명필름의 제조시에 흡착제로서 silica의 첨가가 효과적이라고 판단되었다. 항균제인 benzoic acid(BA) 는 세균 및 곰팡이에 강한 항균효과를 나타내었으며, 특히 곰팡이에 대한 항균력이 우수하였고, 10$0^{\circ}C$, 5분간 열처리시에도 항균력을 유지하였다. 또한 항균성 물질과 공동 첨가시 약간의 상승효과를 나타내어 필름 제조시 공동 첨가하므로서 첨가량의 감소에 따른 비용의 절감 및 항진균 효과가 보완된 필름제조가 가능하다고 사료되었다.

• 약학회지
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• 제49권5호
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• pp.410-415
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• 2005

To investigate biological activity of noni extracts treated with HCl and trypsin, we measured the antioxidant activity through vitro assay and cellular system. Both water and lipid soluble fraction of noni extracts dose-dependently scav­enged DPPH radical. Superoxide scavenging activity of lipid soluble fraction after treating HCl and trypsin was significantly more potent than those of other fractions in NBT/xanthine oxidase assay, which suggests that antioxidant activity of noni extracts was increased by the treatment with HCl and trypsin. In antioxidant assay using RBL 2H3 cells, water soluble frac­tion of noni extracts had little effect on silica-induced reactive oxygen species generation, whereas lipid soluble fraction inhibited in a dose dependent manner. In non-treated noni extracts, effect of water soluble fraction on silica/$CuSO_4$-induced lipid peroxidation was more potent than that of lipid soluble fraction. However, the effects of noni extracts were reversed in noni extracts treated with HCl and trypsin. These data suggest that water soluble substances may be converted into lipid soluble substances by the treatment with HCl and trypsin. From the above results, it is suggested that lipid soluble fraction of noni extracts contain antioxidant used in vitro assay and RBL 2H3 cellular system. Such an effect of noni extracts may be increased by the treatment with HCl and trypsin.

• The Plant Pathology Journal
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• 제22권3호
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• pp.295-302
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• 2006

The present study addressed the efficacy of nanosized silica-silver for controlling plant pathogenic microorganisms. The nanosized silica-silver consisted of nano-silver combined with silica molecules and water soluble polymer, prepared by exposing a solution including silver salt, silicate and water soluble polymer to radioactive rays. The nanosized silica-silver showed antifungal activity against the tested phytopathogenic fungi at 3.0 ppm with varied degrees. In contrast, a number of beneficial bacteria or plant pathogenic bacteria were not significantly affected at 10 ppm level but completely inhibited by 100 ppm of nanosized silicasilver. Among the tested plant pathogenic fungi, the new product effectively controlled powdery mildews of pumpkin at 0.3 ppm in both field and greenhouse tests. The pathogens disappeared from the infected leaves 3 days after spray and the plants remained healthy thereafter. Our results suggested that the product developed in this study was effective in controlling various plant fungal diseases.

• 시멘트 심포지엄
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• 20호
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• pp.26-30
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• 1992

• 방사선산업학회지
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• 제2권3호
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• pp.149-154
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• 2008

The present study described an antimicrobial spray composition comprising nanosized silica-silver particles, in which nano-silver is bound to silica molecules and a water-soluble polymer, the nanosized silica-silver particles prepared by irradiating a solution comprising a silver salt, silicate and the water-soluble polymer with radiation rays. According to a surfactant addition, the compositions were not turbid and were colorless. Also samples (cotton fabrics and wallpaper) were treated with the compositions also did not cause any stains even after drying under sunshine and at $80^{\circ}C$. Our results suggested that the spray formulation product was of practical use to control indoor fungi.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.257-257
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• 2013

In order to selectively remove oil and organic compound from water, silica nanoparticles with hydrophobic coating was used. Since silica nanoparticles are generally hydrophilic, removal efficiency of oil and organic compound, such as toluene, in water can be decreased due to competitive adsorption with water. In order to increase the removal efficiency of oil and toluene, hydrophobic polydimethylsiloxane (PDMS) was coated on silica nanoparticles in the form of thin film. Hydrophobic property of the PDMS-coated silica nanoparticles and hydrophilic silica nanoparticles were easily confirmed by putting it in the water, hydrophilic particle sinks but hydrophobic particle floats. PDMS coated silica nanoparticles were dispersed on a slide glass with epoxy glue on and the water contact angle on the surface was determined to be over $150^{\circ}$, which is called superhydrophobic. FT-IR spectroscopy was used to check the functional group on silica nanoparticle surface before and after PDMS coating. Then, PDMS coated silica nanoparticles were used to selectively remove oil and toluene from water, respectively. It was demonstrated that PDMS coated nanoaprticles selectively aggregates with oil and toluene in the water and floats in the form of gel and this gel remained floating over 7 days. Furthermore, column filled with hydrophobic PDMS coated silica nanoparticles and hydrophilic porous silica was prepared and tested for simultaneous removal of water-soluble and organic pollutant from water. PDMS coated silica nanoparticles have strong resistibility for water and has affinity for oil and organic compound removal. Therefore PDMS-coated silica nanoparticles can be applied in separating oil or organic solvents from water.

• 환경위생공학
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• 제14권4호
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• pp.35-40
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• 1999

For application of a yellow pigment as food additives, stability of a water-soluble yellow pigment from Bacillus sp. PY123 was investigated. The yellow pigment from Bacillus sp. PY123 was purified with pH treatment, activated carbon and silica gel column chromatography. The partial purified yellow pigment appeared only one spot on silica gel TLC after 12 evaporation and under irradiation of UV 253nm at dark room. Rf value of the pigment was measured at 0.04 and 0.12 with development of a solvent mixture (Butanol : Acetic acid : water = 4 :1:5) and a solvent mixture (Isopropanol : Ammonia : Water = 9 :1: 2), respectively, The partial purified pigment appeared a white fluorescence under UV365nm irradiation. The partial purified yellow pigment had a main peak and a minor peak on HPLC using 20mM phosphate buffer(pH 7.0) at 1ml/min flow rate. The partial purified pigment was stable at heat treatment, acidic pH, oxide-reductants and surfactants.

• 한국토양비료학회지
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• 제6권4호
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• pp.221-226
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• 1973

현(現) 비료(肥料) 공정규격(公定規格)에 보증성분(保證成分)이 미달(未達)되는 규회석(珪灰石)의 비효(肥效) 및 규회석(珪灰石)의 가용(可溶) 규산분석법(珪酸分析法)을 검토(檢討)코져, 가용규산함량(可溶珪酸含量)이 상이(相異)한 수종(數種)의 규회석(珪灰石) 및 규회석(珪灰石)과 가용성규산(可溶性珪酸)을 함유(含有)하지 않은 암석(岩石)의 혼합분말(混合粉末)을 광재(鑛滓)와 대조(對照)하여 벼에 대한 재배시험(栽培試驗)을 수행(遂行)하여 규산(珪酸)의 흡수량(吸收量)을 조사(調査)하고, 공시(供試) 규회석(珪灰石)을 수종(數種)의 완형용액(緩衡溶液)에 침출(浸出)하여 규산가용율(珪酸可溶率)과 식물체(植物體)가 흡수(吸收)한 규산함량(珪酸含量)과 상관관계(相關關係) 및 규회석(珪灰石)의 X-선회절분석(線回折分析)을 하여 다음과 같은 결과(結果)를 얻었다. 1. 가용성(可溶性) 규산함량(珪酸含量)(N/2 HCl)이 높은 규회석(珪灰石)일수록 식물체중의 규산함량 및 흡수량(吸收量)을 증가(增加)시켰다. 2. 광재(鑛滓) 처리구(處理區)의 벼 짚중(中) 규산흡수량(珪酸吸收量)은 가용성(可溶性) 규산함량(珪酸含量)이 4.1%인 규회석분말구(珪灰石粉末區)와 같이 가장 낮았다. 3. 가용성(可溶性) 규산함량(珪酸含量)이 높은 규회석(珪灰石)에 잡석(雜石)을 혼합(混合)하여 시비(施肥)하여도 수도체(水稻體)의 규산함량(珪酸含量)은 동량(同量)의 가용성규산함량(可溶性珪酸含量)을 함유(含有)한 규회석(珪灰石)과 같은 효과이었다. 4. 각종(各種) 완형용액(緩衡溶液)에 침출(浸出)된 가용규산(可溶珪酸)과 짚중(中) 규산함량(珪酸含量) 및 흡수량(吸收量)과는 고도(高度)의 유의성(有意性)이 있는 정(正)의 상관(相關)이었으며 N/2염산(鹽酸) 침출규산(浸出珪酸) 분석법(分析法)도 규회석(珪灰石)의 규산분석법(珪酸分析法)으로써 충분(充分)히 사용(使用)될 수 있는 방법(方法)이었다. 5. 규회석(珪灰石)의 X-선(線) 회절(回折)은 규회석(珪灰石)의 조성(造成)을 찾아낼 수 있으며, 결정(結晶)이 불량(不良)한 규회석(珪灰石) 일수록 가용규산함량(可溶珪酸含量)이 높았다.

• 자원리싸이클링
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• 제26권3호
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• pp.53-60
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• 2017

블랙드로스에는 금속 알루미늄, 알루미나, 실리카, 산화마그네슘, 가용성 염 및 미량 성분이 함유되어 있다. 블랙드로스를 사용가능한 재료로 전환시키기 위해서는 실리카의 양을 조절하는 것이 중요하다. 먼저 가용성 염인 염화나트륨과 염화칼륨은 $50^{\circ}C$에서 물에 용해되었다. 물세척 후 잔사에 함유된 실리카, 알루미나, 산화마그네슘 및 산화타이타늄의 침출거동을 NaOH의 농도와 반응온도를 변화시키며 조사하였다. 반응온도 $25{\sim}95^{\circ}C$에서 알루미나의 침출율은 온도에 비례하나 실리카의 침출의 경우에는 최적 온도가 존재하였다. 한편 2~6 M의 NaOH용액에 산화마그네슘은 전혀 용해되지 않았다. 5 M의 NaOH와 $95^{\circ}C$에서 알루미나와 실리카의 침출율은 각각 80과 68%이었다.

• 한국분말재료학회지
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• 제30권4호
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• pp.305-309
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• 2023

This study aims to prepare a colloidal silica-containing powder to enhance the solubility and dissolution rate of rivaroxaban using a self-nanoemulsifying drug delivery system (SNEDDS). We investigate the impact of colloidal silica on a nanoemulsion system for preparing powdered SNEDDS. The liquid SNEDDS comprises 30/20/50 (w/w/w) Peceol/Cremophor RH40/Tween 80, which results in the formation of the smallest droplets. Three powdered SNEDDS formulations are prepared by suspending the liquid SNEDDS formulation using colloidal silica and spray drying. The powdered SNEDDS prepared with liquid SNEDDS and colloidal silica at a ratio of 1/0.5 (w/w) exhibits the highest water solubility (0.94 ± 0.62 vs. 26.70 ± 1.81 ㎍/mL) and dissolution rate (38.4 ± 3.6 vs. 85.5 ± 3.4%, 45 min) when compared to the drug alone. Morphologically, the liquid SNEDDS is adsorbed onto colloidal silica and forms smaller particles. In conclusion, an SNEDDS containing rivaroxaban, prepared using colloidal silica, facilitates the creation of a nanoemulsion and enhances the water solubility of rivaroxaban. Accordingly, this technology holds significant potential for commercialization.