• 제목/요약/키워드: emulsifiers

검색결과 137건 처리시간 0.025초

THE STABILITY OF ALL-TRANS-RETINOL IN NOVEL LIQUID CRYSTALLINE OW EMULSION

  • Kang, H.H.;Cho, J.C.;Lee, J.H.;Lee, O.S.
    • 대한화장품학회지
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    • 제24권3호
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    • pp.111-115
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    • 1998
  • We investigated the stability of all-trans-retinol on the liquid crystalline O/W emulsion composed of mainly alkyl polyglycerine, alkyl polyglucose and glycerine, and compared the activity of all-trans-retinol in the various forms of liquid crystal. Under certain conditions, novel liquid crystalline gel was formed around oil droplets, and layers of this liquid crystalline gel were very wide and rigid. (SWLC; Super Wide Liquid Crystal) SWLC was very helpful to stabilize retinol in O/W emulsion. After storage at 45 C for 4 weeks, all-trans-retinol in O/W emulsion composed of SWLC retained above 85% of the activity upon HPLC analysis, whereas those within no liquid crystalline emulsion gave 47% and normal liquid crystalline emulsion composed of fatty alcohols gave 40 60%. Retinol in oil phase is nealy insoluble in pure water, but in cosmetic emulsion systems can be slightly solubilized into water because emulsifiers and polyols in emulsion systems function as solubilizers. In this case, water in outer phase acts as a media for oxygen transporation$.$and thus destabilizes retinol. As a result, retinol in O/W emulsion has a tendency to become unstable. SWLC surrounding oil droplet which contains retinol is wide and rigid, therefore reduces contact between inner phase and outer phase To make SWLC, properties of emulsifiers are very important phase transition temperature should be high, and the structure of surfactants should be bulky, and their ratio should be suitable to make rigid and wide liquid crystalline gel layer in order to reduce contact between retinol in inner phase and water in outer phase.

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Magnetic and Temperature-Sensitive Composite Polymer Particles and Adsorption Behavior of Emulsifiers and Trypsin

  • Ahmad, Hasan;Rahman, M.Abdur;Miah, M.A. Jalil;Tauer, Klaus
    • Macromolecular Research
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    • 제16권7호
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    • pp.637-643
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    • 2008
  • A combination of magnetic and temperature-responsive properties in the same polymer composites is expected to increase their potential applications in the biomedical field. Accordingly, micron-sized magnetite/polystyrene/poly(2-dimethylaminoethyl methacrylate-ethyleneglycol dimethacrylate), which are abbreviated as $Fe_3O_4$/PS/P (DM-EGDM) composite polymer particles, were prepared by the seeded copolymerization of DM and EGDM in the presence of magnetite/polystyrene ($Fe_3O_4$/PS) particles. $Fe_3O_4$/PS/P(DM-EGDM) composite particles with magnetic properties showed a temperature-sensitive phase transition at approximately $31^{\circ}C$. The adsorption behavior of the low molecular weight emulsifiers and trypsin (TR) as biomolecules were examined on $Fe_3O_4$/PS/P(DM-EGDM) composite polymer particles at different temperatures. The native conformation of TR was followed by measuring the specific activity under various adsorption conditions. The activity of the adsorbed TR on composite polymer particles was higher than those of the tree TR and TR adsorbed on $Fe_3O_4$/PS particles.

Effect of Milk Protein Isolate/κ-Carrageenan Conjugates on Rheological and Physical Properties of Whipping Cream: A Comparative Study of Maillard Conjugates and Electrostatic Complexes

  • Seo, Chan Won;Yoo, Byoungseung
    • 한국축산식품학회지
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    • 제42권5호
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    • pp.889-902
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    • 2022
  • With increasing consumer demand for "clean label" products, the use of natural ingredients is required in the food industry. Protein/polysaccharide complexes are considered good alternatives to synthetic emulsifiers and stabilizers for formulating stable emulsion-based foods. Milk protein and carrageenan are widely used to improve the physical properties and stability of dairy food products. In a previous study, milk protein isolate (MPI) was conjugated with 𝛋-carrageenan (𝛋-Car) in a wet-heating system through the Maillard reaction, and the Maillard conjugates (MC) derived from MPI and 𝛋-Car effectively improved the stability of oil-in-water emulsions. Therefore, MPI/𝛋-Car conjugates were used in whipping cream as natural emulsifiers in this study, and the physical and rheological properties of whipping creams stabilized using MPI/𝛋-Car MC and MPI/𝛋-Car electrostatic complexes (EC) were investigated. The whipping creams stabilized with MPI/𝛋-Car MC have lower rheological parameters (ηa,50, K, G', and G'') than those of whipping creams stabilized with MPI/𝛋-Car EC. Although the overrun value was slightly reduced owing to the addition of MPI/𝛋-Car MC, the stability of the whipped creams with MC was effectively improved due to enhanced water-holding ability by conjugation.

유화제가 스펀지발효 후 냉동생지로 제조한 빵의 품질특성에 미치는 영향 (Effect of Emulsifiers on Properties of the Bread Made by the Dough Frozen after First Fermentation)

  • 이정훈;최두리;이중근;이시경
    • Applied Biological Chemistry
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    • 제47권1호
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    • pp.107-112
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    • 2004
  • 유화제로 SSL과 DATEM을 첨가한 과자빵 반죽을 가당 스펀지도우법으로 스펀지발효 후 냉동하여 냉동기간에 따른 효모의 생균수, 제품의 부피 수분함량 조직감 품질검사 등을 분석한 결과는 다음과 같다. 효모 생균수는 SSL 0.3% 및 DATEM 0.2%를 첨가한 냉동생지에서 높게 검출되었으며, 제품의 부피도 SSL 0.3% 및 DATEM 0.2%를 첨가한 냉동생지에서 크게 나타났다. 제품의 수분함량은 SSL 0.5%를 첨가한 냉동생지에서 높게 나타났고, 제품의 조직감은 SSL 0.3% 및 DATEM 0.2%를 첨가한 냉동생지에서 부드러운 것으로 나타났다. 제품의 품질검사에서는 SSL 0.3% 및 DATEM 0.2%를 첨가한 냉동생지에서 높은 점수를 얻었다. 이상의 결과로 SSL및 DATEM을 혼합하여 사용한 냉동생지를 이용시 빵의 품질을 향상시키는 것으로 나타났다.

W/O형 유화계의 유화안정성 분석에 있어서의 유화안정지수와 HLB값과의 관계 규명 (Relationship between Emulsion Stability Index and HLB Value of Emulsifier in the Analysis of W/O Emulsion Stability)

  • 장판식;신명곤;이원묘
    • 분석과학
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    • 제7권2호
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    • pp.237-243
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    • 1994
  • 유지 함량과 수분의 함량이 4:1(w:w)로 구성되고 유화제가 1.0~3.0%(w/w)의 농도로 첨가된 W/O형 유화계내에서 첨가된 유화제의 HLB값 및 조성이 유화안정성에 미치는 영향을 검토한 바, HLB값이 4.7 이하인 단일 종류의 유화제가 첨가된 실험구가 90.0 이상의 높은 ESI값을 갖는 안정한 W/O형 유화계를 유지하였으며, HLB값이 6.7~8.6 범위의 값을 가지는 단일 종류의 유화제를 함유한 경우는 50.0 이하의 낮은 ESI값을 갖는 불안정한 유화계를 형성하였고, HLB값이 10.5 이상인 유화제를 첨가한 경우는 cream을 형성하는 양상을 타나내었다. 또한, 두 종류 유화제를 3.0%(w/w)의 농도로 첨가하되 두 종류의 유화제 조성을 달리하여 HLB 값을 변화시키면서 W/O형 유화계를 제조하여 ESI값을 측정한 결과, 단일 종류 유화제를 사용하여 유화계를 형성한 실험구의 경우와 동일한 경향을 보였으며, 두 종류 유화제에 의한 상승작용으로 인하여 단일 종류의 유화제를 첨가한 유화계에 비하여 두 종류 유화제가 첨가된 실험구의 ESI값이 전체적으로 5.0~10.0 높은 보다 안정한 W/O형 유화계를 형성하였다.

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Effects of Dietary Exogenous Hydrophilic Emulsifier Supplementation on Growth Performance and Carcass Traits in Broilers

  • Choi, Hyo Sim;Hong, Jin Su;Lee, Geon Il;Kim, Yoo Yong
    • 한국가금학회지
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    • 제49권2호
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    • pp.61-67
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    • 2022
  • 본 연구는 지방의 이용성을 증가시켜주는 사료첨가용 친수성 유화제(SOLMAX®50)를 육계사료에 수준별 첨가시 육계의 성장성적, 도체성적에 미치는 영향을 검증하고자 수행되었다. 총 200수의 1일령 육용종 수평아리(Ross 308)를 공시하여 4처리 5반복, 반복 당 10수씩 난괴법으로 배치하였다. 처리구는 옥수수-대두박 기초사료에 0, 0.025, 0.050, 0.075%의 수용성 유화제를 첨가하였으며, 사료내 대사에너 지함량은 phase1과 phase2 각각 3,025 kcal/kg와 3,075 kcal/kg 이었다. 시험에 사용된 수용성 유화제는 주식회사 기민에서 공급받았다. 사양시설은 왕겨 바닥의 평사로 펜별로 사료 급이기와 급수기를 동일하게 설치하였으며, 사료와 물은 무제한 자유채식 및 음수가 가능하도록 하였다. 총 5주 동안의 사양실험에서 유화제의 첨가수준이 증가함에 따라 증체량 및 사료효율이 유의적으로 개선되었다(linear, P<0.05). 반면 사료섭취량에는 처리구 간에 유의적인 차이는 발견되지 않았다. 유화제 첨가에 따른 성장효과는 전기 3주보다 후기 2주에 더 큰 긍정적인 영향을 미치는 것으로 관찰되었다. 5주의 사양실험 후 처리구별로 5수씩 선발하여 도체분석을 실시하였다. 도체성적에서 유화제의 첨가수준이 증가함에 따라 복강지방의 무게가 증가하였으나(linear, P<0.05), 가슴근육, 다리근육, 간의 무게에 있어서는 유화제의 효과가 나타나지 않았다. 결론적으로 한국가금사양표준(2007)의 에너지요구량 보다 낮은 에너지사료에 유화제의 첨가수준을 0.075%까지 증가시킴에 따라, 육계의 성장성적은 향상되었고 계육생산에는 부정적인 영향을 미치지 않았다.

Lipase의 Transesterification반응에 의한 생물계면활성제의 합성

  • 신영민;정숙현;이상옥;신화경;이희정;이태호
    • 한국미생물·생명공학회지
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    • 제25권4호
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    • pp.420-426
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    • 1997
  • Pseudomonas sp. lipase (lipase AK) catalyzed transesterification reaction between fructose and vinyl laurate in anhydrous pyridine. The product of this process was identified as monoester of fructose and vinyl laurate. The synthetic product has been found to be an excellent emulsifier. The synthetic bioemulsifier showed a good emulsification activity and stability in comparison with other commercial emulsifiers, and good emulsification activity on various emulsifying substrates.

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Surfactant-free microspheres of poly($\alpha$-caprolactone)/poly(ethylene glycol)/poly($\varepsilon$-caprolactone) triblock copolymers as a novel protein carriers

  • Sun, Sang-Wook;Jeong, Young-Il;Jung, Sun-Woong;Kim, Sung-Ho
    • 대한약학회:학술대회논문집
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    • 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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    • pp.408.2-409
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    • 2002
  • The aim of this study is to prepare biodegradable microspheres without use of any kind of surfactants or emulsifiers for a novel sustained delivery carriers of protein drugs. Poly(e-caprolactone)/poly(ethylene glycol)/poly(e-caprolactone) (CEC) triblock copolymer was synthesized by ring-opening of e-caprolactone with dihydroxy poly(ethylene glycol) and was used to make surfactant-free microspheres. (omitted)

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New Analytical Method Using Polar Modifiers in Supercritical Fluid Chromatography and Its Application to the Separation of Fatty Alcohol Ethers

  • 표동진;이규선;이학주;김호현;Milton L. Lee
    • Bulletin of the Korean Chemical Society
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    • 제17권6호
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    • pp.496-498
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    • 1996
  • Fatty alcohol ethers, nonionic surfactants which are used as general purpose emulsifiers were separated by use of water-modified carbon dioxide mobile phase in capillary supercritical fluid chromatography. Much greater peak intensities and improved separation were observed in the chromatogram with on-line modified mobile phase than with pure CO2. A simple method for the preparation of on-line modified mobile phase is also introduced.