• 한국식생활문화학회지
• /
• 제33권2호
• /
• pp.104-111
• /
• 2018

This study aims to compare and analyze a willow tree (Salix Koreensis andersson) extract's antioxidant and anti-inflammatory activity by investigating its: total polyphenol, flavonoid content, SOD-like activity, DPPH vitality. the willow tree was induced with LPS to determine its active anti-inflammatory effects. as a result, the willow methanol extract showed a higher total polyphenol and flavonoid content than those of willow distilled water extract, but the willow distilled water extract showed a higher SOD than that of willow methanol extract. in its DPPH scavenging ability, the willow methanol extract's antioxidant activity was higher than that of the willow distilled water extract. the willow extract's measurements such as the production of NO, inflammatory cytokine ($TNF-{\alpha}$, IL-6 measurement) were significantly reduced as its concentration level went down. according to the research outcomes, when induced, he will extract's macrophage produces mediator-like substances such as NO and inflammatory cytokine that can be used to alleviate the inflammatory response. therefore, the willow tree proved to be a useful raw plant material for the products designed to combat inflammatory activities due to its natural antioxidant and anti-inflammatory response substances such as NO and cytokine.

• 구강회복응용과학지
• /
• 제32권4호
• /
• pp.274-279
• /
• 2016

목적: 치과 기공용 연마기 휠을 소독하기 위한 클로르헥시딘의 농도에 따른 캔디다균의 감염방지효과에 대해 알아보고자 하였다. 연구 재료 및 방법: 동일한 모형에서 제작된 상악 총의치를 캔디다균에 감염시키고, 서로 다른 농도의 클로르헥시딘 용액에 1시간 보관한 연마 휠과 멸균된 퍼미스와 증류수를 이용하여, 치과기공용 연마기로 연마하였다. 이후 멸균된 상악 총의치를 연이어 연마한 뒤 연마한 부위를 면봉으로 채취하여, 재배양후 칸디다균의 여부를 확인하였다. 결과: 클로르 헥시딘을 적용한 연마휠은 농도에 관계 없이 감염의 전파가 일어나지 않았으나, 증류수만을 사용한 연마휠에서는 감염의 전파가 나타났다. 결론: 의치 연마기 휠의 감염방지를 위해 클로르헥시딘 용액은 효과적이다.

• 생명과학회지
• /
• 제20권7호
• /
• pp.999-1004
• /
• 2010

밀기울 발효에서 효소회수의 모델로 Aspergillus niger를 고체상태로 발효시켜 조사하였다. 발효시킨 밀기울에서 증류수로 효소추출 효율은 초산 완충액, 구연산 완충액, 구연산-인산 완충액 및 5% 메탄올 처리보다 높았다. 따라서, 추출 용매로 증류수를 이용하여 최적 조건을 상세히 검토하였다. 최적 조건은 고체와 액체 용매를 1:5의 비율로 증류수로서 세 번 세척하였을 때에 최대 회수율을 0.025 U/g으로 확보하였다.

• 패션비즈니스
• /
• 제20권4호
• /
• pp.128-140
• /
• 2016

In this study, dyeability of Urtica Dioica L. extract, which is relatively less studied, was measured. The extract of this plant was used to dye cellulose and protein fiber to check its usage as a natural green dye. Three different methods were used to produce extract. Dried Urtica Dioica L. was extracted with 100% ethanol, 50% ethanol with 50% distilled water and 100% distilled water. Then dyeing solution was obtained by blending with distilled water at 1-to-1 ratio. The maximum dyeability was obtained when 100% ethanol extract of dried Urtica Dioica L. used to dye fabrics at 60 degrees celsius for 60 minutes without mordant treatment. Cotton, rayon, wool and silk were dyed and dyeability for each fiber was measured for color difference value then compared to its control. The results show that dyeability of rayon and dyeability of wool are stronger, and that when color position for each mordant is measured, color difference is most diverse on cotton with pre-mordant treatment. Color fastness to wash, perspiration and rubbing crockmeter were superb, but color fastness to light was low, therefore, additional study on this is needed to improve. Urtica Dioica L. is now expected to be used practically as green color dye as well as medicinally and edible.

• 한국식품영양학회지
• /
• 제35권4호
• /
• pp.268-275
• /
• 2022

The purpose of this study was to confirm the possibility of using Korean purple yam (Dioscorea alata) as proximate composition, material, and antioxidant activity. In the proximate composition of the freeze-dried purple yam powder, the carbohydrate content was the highest at 86.67%, and in minerals, potassium showed the highest content at 1,765.69 mg/100 g. To study the antioxidant activity of purple yam, distilled water and 70% ethanol were used as extraction solvents. The total polyphenol, total flavonoid, and total anthocyanin contents were 1.3~1.6 times higher in 70% ethanol extract, than in the distilled water extract. As a result of ORAC, DPPH and ABTS radical scavenging activity, SOD activity, and reducing power, the 70% ethanol extract showed higher antioxidant activity than the distilled water extract in all results. As a result of freeze-drying purple yam and measuring antioxidant activity by extraction solvents, it is concluded that purple yam can contribute to the food industry as a natural antioxidant and health functional material.

• Korean Chemical Engineering Research
• /
• 제59권4호
• /
• pp.503-507
• /
• 2021

이동용 고분자전해질 연료전지(PEMFC)의 수소발생용으로써 NaBH₄는 많은 장점을 갖고 있다. 야외에서 PEMFC가 이송형으로 사용될 때 증류수대신 담수를 이용해 NaBH₄ 가수분해하면 경제적이다. 그래서 본 연구에서는 NaBH₄ 가수분해 과정에 증류수대신 담수를 이용해 수소를 발생시켰다. 활성탄 담지 Co-P-B/C 촉매를 사용해 NaBH₄ 가수분해 특성에 대해 연구하였다. 담수는 NaBH₄ 가수분해과정에서 4수화물을 발생시키지 않았고, 증류수는 4수화물 부산물이 생성되어 가수분해과정에서 많은 물이 소모되어서 NaBH₄ 25% 이상 고농도에서 반응 종료시점에는 건조한 부산물과 미반응 NaBH₄가 남았음을 확인하였다. 이 결과 담수를 사용했을 때 NaBH₄ 25% 이상 고농도에서 증류수보다 수소 수율과 수소발생속도가 더 높아 무인항공기등 이송형 연료전지에도 적용하기에 적합함을 보였다.

• 한국식물병리학회지
• /
• 제10권2호
• /
• pp.144-147
• /
• 1994

About 450 phytopathogenic fungal cultures were stored in sterile distilled water ar room temperature by the sterile water storage method, which has been known as a simple, convenient, and long-term storage method of microorganisms. After 12 months, viability and pathogenicity of the stored isolates were tested. Among 205 tested, 175 isolates (84.5%) survived. Of these, Rhizoctonia solani, Botrytis cinerea, Pyricularia oryzae, Phytophthora infestans, and Sclerotinia sclerotiorum showed relatively lower survival rate; 92%, 74.1%, 62.5%, 45.8%, and 30%, respectively. Twenty seven isolates belonging to seven important phytopathogenic fungi were tested for pathogenicity, and all isolates tested maintained pathogenicity until at least 12 months after storage.

• Bulletin of the Korean Chemical Society
• /
• 제31권5호
• /
• pp.1192-1198
• /
• 2010

Pharmaceuticals and personal care products (PPCPs) are emerging contaminants in the aquatic environment. Many pharmaceuticals are not completely removed during wastewater treatment, leading to their presence in wastewater treatment effluents, rivers, lakes, and ground water. Here, we developed analytical methods for monitoring ten pharmaceuticals from surface water by LC/ESI-MS/MS. For sample clean-up and extraction, MCX (mixed cation exchange) and HLB (hydrophilic-lipophilic balance) solid-phase extraction (SPE) cartridges were used. The limits of detection (LOD) in distilled water and the blank surface water were in the range of 0.006 - 0.65 and 1.66 - 45.05 pg/mL, respectively. The limits of quantitation (LOQ) for the distilled water and the blank surface water were in the range of 0.02 - 2.17 and 5.52 - 150.15 pg/mL, respectively. The absolute recoveries for fortified water samples were between 62.1% and 125.4%. Intra-day precision and accuracy for the blank surface water were 2.9% - 24.1% (R.S.D.) and -16.3% - 16.3% (bias), respectively. In surface wastewater near rivers, chlortetracycline and acetylsalicylic acid were detected frequently in the range of 0.017 - 5.404 and 0.029 - 0.269 ng/mL, respectively. Surface water near rivers had higher levels than surface water of domestic treatment plants.

• The Plant Pathology Journal
• /
• 제16권4호
• /
• pp.206-210
• /
• 2000

The effect of the electrolyzed oxidizing water on Sphaerotheca fuliginea was investigated with germination and sporulation of the fungal conidia. The sporulation was inhibited by the electrolyzed oxidizing water of pH 2.5, 3.5, and 4.5, but was not inhibited by the distilled water adjusted pH with 1N-HCL solution. However, the electrolyzed oxidizing water did not affect conidial germination. The oxidation-reduction potential at pH 2.5 and pH 3.5 of electrolyzed oxidizing water were 1130 mV and 1060 mV, respectively, but those of distilled water adjusted with HCL solution were 550 mV and 490 mV, respectively. When the electrolyzed oxidizing water of ORP over 1100 mV was sprayed on cucumplanting, the disease severities of powdery mildew were about 8.5% and 19.2%, respectively. Disease severity of a standard control (triflumizole 30% WP, $500\textrm{mg}\textrm{/L}$) was about 3.0%, while that of plants without electrolyzed oxidizing water was to 45.8%.

• Elastomers and Composites
• /
• 제42권2호
• /
• pp.102-106
• /
• 2007

카본블랙, 커플링제가 없는 실리카, 그리고 커플링제를 함유한 실리카 등 다른 충전 시스템을 갖는 SBR 가황물의 수팽윤 거동에 대해 연구하였다. 증류수와 3.5% NaCl 용액을 팽윤 매질로 사용하였다. 증류수에서의 수팽윤비가 소금물에서의 그것보다 높았다. 카본블랙으로 보강된 가황물의 수팽윤비가 실리카로 보강된 것보다 낮았다. 실리카로 보강된 SBR 가황물의 경우, 커플링제가 없는 것이 커플링제를 함유한 것보다 더 큰 수팽윤비를 나타내었다. 1,2-유니트 함량이 다른 SBR 가황물의 수팽윤 거동에 대해서도 비교하였다. 수팽윤비는 1,2-유니트 함량이 증가함에 따라 감소하는 경향을 보였다.