• 한국식품영양학회지
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• 제23권4호
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• pp.600-606
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• 2010

The objective of this study was to develop functional rice coated with yacon roots extracts and to evaluate the antioxidant properties and physiological activity of rice coated with yacon extract. The washed rice was coated by spraying yacon extract at 10, 20, 30, and $40^{\circ}Brix$ and dried at room temperature. The moisture contents, color changes, antioxidant properties as total polyphenolics and DPPH radical scavenging activity and instrumental texture property and sensory evaluation change in the yacon root extracts coated rice and uncoated cooked rice were observed during 3 days of storage. Increasing the coating concentration was associated with lower color values(L value) and moisture contents. Total phenolics and DPPH radical scavenging properties generally increased in the cooked rice coated with yacon root extract more than the control (non-coated rice). However, D-20($20^{\circ}Brix$ of the yacon root concentration) resulted in better textural properties and sensory overall acceptability in cooked rice on 0 and 3 storage days. It was concluded that the optimum coating ration of rice and added functional yacon rice were $20^{\circ}Brix$ and 7% respectively, in proportion to the total weight of raw rice.

• Journal of the Korean Wood Science and Technology
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• 제22권3호
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• pp.45-50
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• 1994

This experiment was to investigate the effects of UV radiation and chemical treatments on the color difference in antioxidant (Tris(2,4-di-t-butyl phenoxy) phosphite)-containing polyurethane coats. The results obtained were summerized as follows: 1. The color difference increased as the exposure time of UV radiation increases, but decreased as addition level of antioxidant increaes. 2. After 400 hours exposure to UV radiation, the color difference respectively showed 6.13 and 5.94 at 0.7 % and 1.0 % addition level but appeared more severe below 0.7 % addition level. Thus, antioxidant prevented discoloration effectively. 3. The color difference of films by chemical treatments increased after 8 hours. Color difference of films treated with 5 % acetic acid($CH_3COOH$), 30 % ethyl alchol ($CH_3CH_2OH$) showed 7.31 and 7.30 respectively. 1 % sodium hydroxide treatment showed 1.86 color difference after 8 hours.

• Membrane and Water Treatment
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• 제13권4호
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• pp.191-199
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• 2022

In industrial production, the development of traditional polyamide nanofiltration (NF) membrane was limited due to its poor oxidation resistance, complex preparation process and high cost. In this study, a composite NF membrane with high flux, high separation performance, high oxidation resistance and simple process preparation was prepared by the method of dilute solution dip coating. And the sulfonated polysulfone was used for dip coating. The results indicated that the concentration of glycerin, the pore size of the based membrane, the composition of the coating solution, and the post-treatment process had important effects on the structure and performance of the composite NF membrane. The composite NF membrane prepared without glycerol protecting based membrane had a low flux, when the concentration of glycerin increased from 5% to 15%, the pure water flux of the composite NF membrane increased from 46.4 LMH to 108.2 LMH, and the salt rejection rate did not change much. By optimizing the coating system, the rejection rate of Na₂SO₄ and PEG1000 was higher than 90%, the pure water flux was higher than 40 LMH (60psi), and it can withstand 20,000 ppm.h NaClO solution cleaning. When the post treatment processes was adjusted, the salt rejection rate of NaCl solution (250 ppm) reached 45.5%, and the flux reached 62.2 LMH.

• 한국식품저장유통학회지
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• 제30권3호
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• pp.419-433
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• 2023

Dried apple bugak, a traditional Korean dried food, was made using superfine powders of glutinous rice (GR), non-glutinous rice (NGR), and Wasabia koreana Nakai leaf (WKNL) as coating materials. This study aimed to determine the effect of coating sliced apples with superfine GR powders substitute with superfine NGR and WKNL powders at different ratios. Apple slices coated with superfine GR, NGR and WKNL powders were air-fried and compared with dried and air-fried apple bugak coated with superfine GR powders. The results showed that coating apple slices with superfine GR powders with the addition of superfine NGR and WKNL powders significantly increased oil absorption capacity and antioxidant activity but reduced viscosity, water absorption capacity, total polyphenol, total flavonoids contents, and improved color and structural improvements. Among all the samples, 80:20:5-treated (GR:NGR:WKNL) dried and air-fried bugak showed enhanced quality characteristics. Thus, the results suggested that coating apple slices by the substituting GR superfine rice powders with 10 or 20% of NGR and 3 or 5% of WKNL superfine powders produces good quality dried and air-fried bugak with nutritious characteristics.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.380.1-380.1
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• 2016

In this study, we report a novel antioxidant ZnO nanoparticle that is newly designed and prepared by simple surface modification process. Antioxidative functionality is provided by the immobilization of antioxidant of 3,4,5-trihydroxybenzoic acid (galic acid, GA) onto the surface of ZnO nanoparticles. Microstructure and physical properties of the ZnO@GA nanoparticles were investigated by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), infrared spectroscopy (IR) and steady state spectroscopic methods. The antioxidative activity of ZnO@GA was also evaluated using ABTS (3-ethylbenzothiazoline-6-sulfonic acid) radical cation decolorization assay. Notably, ZnO@GA showed strong antioxidative activity in spite of the conjugation process of GA on the ZnO surface. These results provide that GA-coating onto ZnO nanoparticles may offer an intriguing potential for biomedical devices as well as nanomaterials.

• 대한기계학회논문집A
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• 제38권12호
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• pp.1435-1440
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• 2014

로켓 노즐 목에 이용되는 ATJ 그라파이트에 대해 시편크기 및 온도에 따른 압축강도를 평가하였다. 압축시험은 ASTM C 965 규정에 준하여 상온 및 고온에서 수행되었다. 상온에서는 직경 대 높이 비가 1:2 인 ASTM 규정에 부합하는 표준시편 및 직경 대 높이비가 1:1 및 1:0.5 인 Type I, Type II 등 2종류의 확대시편이 일축 압축시험에 이용되었다. 또한 고온에서는 산화제를 도포한 코팅시편 및 일반시편을 이용하였다. 시험결과 상온에서 모든 확대시편들이 표준시편보다 약간의 압축강도 증가를 보였다. 고온환경에서의 압축시험결과 코팅시편은 $900^{\circ}C$ 까지 압축강도가 유지되거나 약간의 증가를 보였으나, 일반시편은 산화로 인해 압축강도가 급격하게 감소했다.

• 한국가구학회지
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• 제26권2호
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• pp.122-129
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• 2015

In previous study, VOC emission characteristics of coating materials for wood finishing were conducted and results showed that eco-friendly products has about 15~46% lower TVOC emission than typical products. In this study, lower TVOC emitted coating materials were applied on pine and then changes of VOC emission characteristics from pine with treatments were determined. Non-treated pine emitted $604.7{\mu}g/m^2h$ of TVOC that contained 66% of NVOC ($399.7{\mu}g/m^2h$). However, $V_2$ finished pine showed no NVOC emission rather than AVOC emission that consisted of Toluene, Ethylbenzene, m,p-Xylene, o-Xylene, 1,2,4- Trimethylbenzene. All coating materials inhibited ${\alpha}$-Pinene emission which originally from pine, but waterborne stain ($W_1$ and $W_3$) showed lower disruption of that emission. Moreover, $W_3$/wood showed higher NVOC emission such as ${\alpha}$-Terpinol, Terpinen-4-ol which are known as antioxidant substrates. Based on results, VOC emission characteristic of pine was significantly affected by coating materials with negatively in terms of ${\alpha}$-Pinene emission or positively in terms of NVOC emission. Therefore, coating material is important factor for indoor air quality when it would apply on wood products. For the future study, VOC emission characteristic of coated wood will be conducted continuously.

• 한국식품영양학회지
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• 제16권4호
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• pp.430-436
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• 2003

빵의 저장성과 품질의 향상을 목적으로 천연 첨가물인 키토산을 표면 처리한 결과 다음과 같은 결과를 얻었다. 저장 중의 생균수와 곰팡이수를 측정한 결과 키토산 처리한 빵이 생균수가 적게 측정되었고, 곰팡이도 8일 동안 발생하지 않아 뛰어난 저장성을 나타냈다. 또한 키토산 표면처리한 빵의 저장 중 산화도 크게 억제된 것으로 나타났다. 저장 중 빵의 노화에 영향을 미치는 수분함량과 수분활성의 변화는 키토산 처리한 것이 안정되게 유지됨을 알 수 있었다. 키토산을 처리하여도 빵의 pH에는 큰 영향을 미치지 않았으며, 표면색은 2.0%의 농도로 처리한 경우에만 저장 중 색의 변화가 있었고 그 이하의 농도에서는 큰 변화가 없는 것으로 나타났다. 따라서 분자량 약 120 kDa의 키토산을 2.0% 미만의 농도로 빵의 표면에 처리하면 저장성이 향상되며 노화를 억제하여 저장 중 품질을 유지할 수 있을 것으로 사료된다.

• Journal of Ginseng Research
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• 제34권2호
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• pp.145-149
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• 2010

This study investigated the antioxidant effects of ginseng coffee in L6 muscle cells. Ginseng coffee was prepared by coating and digesting coffee beans with ginseng concentrate. The ginseng coffee water extract potently protected against hydrogen peroxide-induced L6 cell death and adenosine triphosphate reduction in a dose-dependent manner; in fact, these cytoprotective effects were significantly greater than those of normal coffee. However, ginseng coffee did not exhibit significant radical scavenging or catalase-like activity. These results suggest that ginseng coffee might act as a cytoprotective agent in muscles, but that the protective effects are not due to a direct radical-reduction property but rather to another intracellular signaling factor.

• 한국식품저장유통학회지
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• 제24권7호
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• pp.934-941
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• 2017

파프리카는 우리나라의 대표적인 수출작물로 알려져 있지만 장거리 유통 중 일어나는 품질열화로 인해 상품적 가치가 감소되는 문제가 있다. 따라서 본 연구는 농산물 유통 시 주로 사용되는 골판지상자의 내부에 알루미늄을 코팅하여 기능성을 부여한 포장용기를 개발하였으며, 이를 이용하여 파프리카를 포장하여 저장 중 선도유지 및 품질특성에 미치는 영향을 알아보았다. 골판지상자 내부에 알루미늄을 코팅함으로써 방습성을 향상시키고 기체투과도를 저하시킴으로써 포장된 파프리카의 펙틴분해효소 활성이 저하됨에 따라 파프리카의 중량변화율과 조직연화 현상이 저해되었고, 산화효소 활성이 감소함으로써 총 페놀 함량 및 항산화 활성이 향상되는 것으로 나타났다. 결과적으로 알루미늄 코팅한 골판지상자는 파프리카의 상품성 및 저장성을 향상시키는 포장용기로 이용될 수 있을 것으로 생각되며, 알루미늄박의 내수성, 내한성, 보향성, 내오염성 등의 특성을 활용한 추가연구를 통해 국내 농산물의 장거리 유통 및 수출 활성화에 이바지할 수 있을 것이라 생각된다.