• Journal of Animal Science and Technology
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• 제51권6호
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• pp.521-526
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• 2009

Irradiation of egg white increased foaming ability significantly. To investigate the protein modification by irradiation responsible for the increase of foaming ability, 3 major egg white proteins were purchased and mixed (7.7 g/L ovalbumin, 1.8 g/L ovotransferrin, 0.5 g/L lysozyme) as a model system and irradiated at 0, 2.5, and 5 kGy. The different protein expressions were evaluated using 2-D electrophoresis and it was found that ovotransferrin was cleaved by irradiation and molecular weight and isoelectric point were changed. In addition, many uncharacterized proteins were found and it indicated that irradiation modified proteins randomly but mainly fragmentation was observed. Therefore, it can be concluded that protein fragmentation of 3 major egg white proteins responsible for foaming ability may be the main reason for the improvement of foaming ability.

• Applied Biological Chemistry
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• 제36권6호
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• pp.434-439
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• 1993

중성염이 단백질의 거품성에 미치는 영향을 밝히기 위하여 NaF, $Na_2SO_4$, NaCl, $NaNO_3$ 및 NaSCN 등 5종 중성염을 가지고 0.1, 0.5, 1.0, 1.5 및 2.0 M 농도별로 sodium caseinate(5%, w/v)에 작용시켜 이들 염류가 거품성에 미치는 영향을 조사하였다. NaSCN을 제외한 모든 염류들은 거품형성능 증진효과가 있었고, 거품형성능을 위한 염류의 최적농도는 $Na_2SO_4$, NaCl 및 NaSCN에서 각각 0.5, 1.5 및 1.0 M이었으며, NaF 및 $NaNO_3$에서는 각각 0.5 및 2.0 M 농도에서 거품형성능이 양호하였다. 거품안정성은 0.5 M $Na_2SO_4$의 경우 37.0분(대조구 4.0) 으로서 가장 양호하였으며 0.5M NaF에서도 28.6분으로써 크게 증가하였으나, NaSCN의 경우는 역으로 모두 감소하였다. 거품안정성이 가장 양호한 것으로 나타난 0.5 M 농도의 경우, 거품안정성의 크기는 $Na_2SO_4$>NaF>$NaNO_3$>NaCl>NaSCN의 순으로 나타났으며 이는 음이온이 단백질의 염석효과를 나타내는 Hofmeister 계열순서와 거의 일치하였다. 본 실험의 중성염을 첨가하여 조제한 단백질 시료용액의 경우, 혼탁도, 표면장력 및 절대점도의 증감에 따른 거품성의 뚜렷한 변화는 나타나지 않았다.

• 한국세라믹학회지
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• 제35권12호
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• pp.1280-1285
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• 1998

Foaming method is presented the preparation of porous materials from high-concentrated kaolin silica and flyash slurries. The slurries were foamed dried and sintered respectively. The porosity of sintered ma-terials was about 70-75% Mean pore-size was the range of 70-150$\mu\textrm{m}$ and pore structure was continuous Sodium lauryl sulfate anionic surfactant was used as a foaming agent. The foaming ability and the froth sta-bility were increased with increasing the concentration of the foaming agent. But the size of the constituent bubble of froth after foaming process was not affected by the concentration of the foaming agent. These results showed that the mean pore-size of sintered materials was closely related to the froth stability which is related to the change of bubble-size during the drying process.

• 한국결정성장학회지
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• 제12권1호
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• pp.56-61
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• 2002

전남 영암산 이타점토 출발원료에 계면활성제를 사용하여 고농도의 slurry를 발포시킨 후 성형하여 다공질 세라믹스를 제조하였다. slurry에서의 계면활성제 농도변화는 다공질 세라믹스의 기공변화 및 물리적 특성을 제어하는 중요한 요인이었다. 발포용 slurry의 농도는 발포제인 계면활성제 농도가 증가할수록 발포력과 포말층의 안전도는 향상되었으나, 6.0 wt% 농도 이상에서는 계면활성제 양이 많아짐으로써 초기 slurry의 점도가 높아져 발포력이 좋지 못했다. 성형시편을 $1150^{\circ}C$와 $1200^{\circ}C$ 온도에서 소성하였고, 그 결과 부피비중은 약 0.9, 흡수율은 45%, 겉보기 기공율은 50%, 수축율은 14% 그리고 압축강도는 70kg/$\textrm{cm}^2$인 다공질 세라믹스를 제조할 수 있었다.

• Food Science and Biotechnology
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• 제15권3호
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• pp.418-423
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• 2006

Egg white powders (EWPs) were produced after pH adjustment (PH 6-9) of fresh egg white, followed by spray-drying, and foaming and gelling properties of EWPs were examined. EWP produced after pH adjustment to 6.5 (EWP-6.5) resulted in significantly higher foaming ability and gel hardness than control and other pH-adjusted EWP. Significant increases in surface -SH content and surface hydrophobicity of EWP-6.5 coincided with improved foaming ability and gel hardness. Significantly higher consistency index for reconstituted EWP-6.5 indicates unfolding of egg white protein was substantially increased in EWP-6.5. Decreased a-helix content in EWP-6.5 was confirmed by circular dichroism spectral analysis. These results indicate pH adjustment prior to spray-drying leads to structural changes in egg white proteins, significantly affecting major functionalities of EWP.

• 한국식품영양과학회지
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• 제22권6호
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• pp.743-752
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• 1993

To elucidate the effects of natural gums, i.e. carrageenan, locust bean gum and xanthan gum and synthetic gums, i.e. carboxymethyl cellulose(CMC) and methyl cellulose(MC) on the foaming properties of sodium caseinate, surface tension, absolute viscosity, turbidity, foaming ability, foam stability, and heat stability of the foams of the caseinate solutions with added gums were examined. The surface tension of sodium caseinate solution(5%) adding to gums at pH 4.0 and 5.0 were higher than those at pH 7.0 and 8.0. The viscosities of the solutions adding to gums(0.1, 0.2, 0.3 and 0.5%) ap pH 4.0, 5.0, 7.0 and 8.0 were 2.4~170.0, 2.5~190.0, 5.3~180.0 and 6.3~99.0 cps, respectively. Especially xanthan gums predominantly increased the viscosity. Turbidities were 97.3~98.2 at pH 4.0 and 5.0 and 93.0~95.8 at pH 7.0 and 8.0. Foaming abilities of the solution adding to xanthan gum, carrageenan and locust bean gum were increased, while those of CMC and MC were decreased. Additions of xantham gum, CMC and MC increased the foam stability, especially xanthan gum did predominantly. Xanthan gum, MC and locust bean gum were more effective than CMC and carrageenan for heat stability. For improving the foaming properties of sodium caseinate xanthan gum were best of five kinds of gums. Surface tensions and turbidities of the solution were related to foaming ability, and the viscosities were related to foam stability and heat stability.

• 한국응용과학기술학회지
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• 제21권2호
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• pp.156-163
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• 2004

Low foaming scouring agents (LSSA) were prepared by blending of amine salt of dodecylbenzene sulfone, poly (PO-b-EO) glycol, Newpol PP-2000, MJU-100, ethylene glycol and organic solvent. As the results of several tests, LSSA-2 showed good scouring effect, penetrating ability and emulsifiability, and showed not much water pollution. The foaming power of LSSA-2 measured by Ross & Miles method was 11mm foam height immediately after foaming. And the foaming power of LSSA-2 measured by Ross & Clark method were less than 310mm foam height at $30^{\circ}C$, 17mm at $80^{\circ}C$. As a result, LSSA-2 was proved as a good foaming scouring agent.

• 한국가정과학회지
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• 제4권1호
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• pp.62-67
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• 2001

달걀에 0.5∼3.0kGy의 방사선을 조사한 다음 난백을 분리하여 비조사 및 조사 난백의 물리적, 기능적 특성을 비교 $.$검토하였다. 방사선 조사 달걀을 30$\^{C}$에서 2시간 방치한 다음 난백을 분리하여 실험재료로 사용하였다. 점도는 방사선을 조사하지 않은 대조군 난백이 가장 높았다. 조사 난백의 점도는 조사선량이 가장 낮은 0.5kGy에서 급격히 감소하였으며 이 후 완만한 감소를 보였다. 달걀을 할란하여 난백의 상태를 비교한 결과, 대조군 난백은 농후난백과 수양난백의 구분이 뚜렷했으나, 조사 난백은 구별할 수 없었다. 난백의 pH는 방사선 조사의 영향을 받지 않았다. 한편 색도는 방사선 조사에 따라 명도와 녹색도가 낮아졌다(p<0.05). 난백의 기포형성력은 overrun으로 측정하였는데, 조사 난백은 대조군에 비해 overrun이 증가하였다(p<0.05). 조사선량 3kGy인 난백의 overrun은 대조군 난백에 비해 1.7배 정도 높았다. 난백의 기포 안정성은 기포를 30분 방치하는 동안 유리되는 액량으로 검토하였다. 유리액량은 대조군 난백이 가장 많았다(p<0.05). 조사 난백의 유리액량은 조사선량이 증가함에 따라 감소하였다

• 상하수도학회지
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• 제24권4호
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• pp.369-376
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• 2010

The purpose of this study is to reprocess Waste-LCD(Liquid Crystal Display), to widely increase specific surface-area by foaming agent in the process of reprocessing and to use as a substrate of water treatment which is increased the ability of biological treatment, as well as to control non-point source pollutants produced by surface run off during rainfall with using this substrate, and to improve water quality of public watershed as developing substrate for water treatment to be able to purify second treated water which is exhausted at the wastewater treatment plant. The average removal efficiency of Waste-LCD that using the foaming technology was SS 71.2%, BOD 55.7%, COD 58.4%, T-N 29.5% and T-P was 50.3%. Almost Media, early stage showed low removal efficiency of SS and BOD. However, it became high when the microorganism adhered the Media. The variation of SS removal efficiency was high by inflow concentration of SS. The reason for the Media 4 showed high SS removal efficiency is that it has wide specific surface-area, and also it has a pore. All in all, it shows floating matter treatment ability not only inside but it also works outside of the substrate.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2007년도 추계 학술논문 발표대회
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• pp.27-30
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• 2007

Recently, use of light-weight panel is increasing in building. Styrofoam sandwich panel is inexpensive and it is excellent in insulation ability and constructability. But styrofoam of panel inside is low ignition point. Consequently, when panel is fired, it is occur in poisonous gas. On the other hand, light-weight foamed concrete is excellent in insulation ability, fire resistance due to inner pore. Properties of light-weight concrete is influenced by foaming agent type. Accordingly, this study investigate in insulation property of according to foaming agent type in order to using light-weight foamed concrete instead of styrofoam. As a results, Non-heating zone temperature of light-weight foamed concrete of using AP, FP are lower than light-weight foamed concrete of using AES. Light-weight foamed concrete of using AES, FP are satisfied with fire performance of two hours at foam ratio 50, 100. Light-weight foamed concrete of using AP is satisfied with fire performance of two hours at AP ratio 0.1, 0.15. Insulation property is better closed pore by made AP, FP than open pore by made AES.