• Title/Summary/Keyword: Emulsifier

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Sensory Characteristic of Backsulgi Added with Rich Sources of Phospholipid (인지방질 함유식품 첨가에 따른 백설기의 관능적 특성)

  • 이경아;김경자
    • Korean journal of food and cookery science
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    • v.18 no.4
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    • pp.390-398
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    • 2002
  • The purpose of this study was to select a cake ingredient acting as an emulsifier to retard the retrogradation of rice cake commercially available. For the purpose, Backsulgi, a traditional Korean rice cake, was prepared by adding various ingredients having high contents of lecithin such as raw soybean powder, parched soybean powder, soybean oil, egg yolk powder, and then the changes in the sensory and textural characteristics of the cakes were determined while storing them at the temperatures of 4$\^{C}$ and 20$\^{C}$ for 0, 1, 2 and 3 days. Based on the sensory evaluation, Backsulgi samples added with raw soybean flour were significantly different in roasted nutty smell, roasted nutty taste, softness, moistness, cohesiveness and overall quality compared with the control in the longer storage time at 20$\^{C}$.

Characterization of Emulsion Properties for D-limonene (D-리모넨 오일의 유화특성)

  • 하윤식;장윤호;문현수;이정경;서무룡
    • Journal of Environmental Science International
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    • v.7 no.6
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    • pp.875-881
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    • 1998
  • Microemulsion is prepared by the method of phase inversion emulsification with d-limonene that is environmental friendly substance and nontoxic to human body as dispersed phase. Emulsifier used for preparation of microemulsion is nonionic surfactants, polyoxyethylene nonylphenyl ether. Stability of prepared microemulsion was estimated by the various method of ξ-potential, hydrodynamic diameter and electric conductivity. When d-limonene is emulsified by NP series, microemulsion is most stable and narrowly distributed at HLB value of 12.3(either one emulsifier or mixed emulsifiers). Stability of microemulsion is increased as the amount of emulsifiers is increased at same HLB value of 12.3. In the case of using the same amount of emulsifiers, number of produced micelle are relatively large as hydrodynamic diameter is small. Therefore, the state of microemulsion is stable and the electric conductivity is increased. One can determine that higher electric conductivity value means that microemulsion has more micelles and is more stable.

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Manufacturing of Positively Charged White Electronic ink by Latex Particles for Electrophoretic Display

  • Yu, Dong-Guk;An, Jeong-Ho;Bae, Jin-Young;Lee, Yong-Eui;Ahn, Sung-Duk;Kang, Seung-Yeol;Suh, Kyung-Soo
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.995-997
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    • 2003
  • In this study, we have investigated the positively charged polymer particles using emulsifier-free emulsion polymerization for applications in electrophoretic displays. The FT-IR, Zeta potential and SEM characteristics showed that by emulsifier-free polymerization, the positively charged polymer particles were manufactured. Using these particles, we can obtain well-dispersed white latex particles in dielectric suspending media.

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The sensory Characteristics of Rice Extrudate by Addition of Emulsifier(Glycerin Fatty Acid Ester) (亂化劑(Glycerin fatty acid ester)添加에 따른 쌀 壓出 成型物의 官能的 特性)

  • 고광진
    • Journal of the East Asian Society of Dietary Life
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    • v.3 no.1
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    • pp.67-71
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    • 1993
  • This study ws prepared to evaluate sensory characteristics about appearance, color, texture and overall acceptability of rice extrudate with added glycerin fatty acid ester by balance incomplete block design. According to evaluated mean of adjusted treatments, appearance and color were represented maximum value in rice extrudate with added 3.0% and 1.0% glycerin fatty acid ester respectively. Extrudate with added 1.5% emulsifier revealed best texture and overall acceptability among whole treatments. On the results of this research about sensory characteristics, extrudate with added 1.5% glycerin fatty acid ester was considered excellent because of highest score of texture and overall acceptability, and predominent score of appearance and color.

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Preparation and Emulsifying characteristics of Diethylene glycol succinate Derivative (에틸렌디글리콜과 숙신산 에스테르의 제조와 유화 특성)

  • Lee, Jae-Duk;Jeong, Noh-Hee
    • Journal of the Korean Applied Science and Technology
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    • v.26 no.3
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    • pp.233-239
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    • 2009
  • A reaction device raising a generation yield by efficiently removing water generated in an esterified reaction between diethylene glycol monoethyl ether and succinic acid with mixture of an azeotropic point was newly developed as a new product in development of more stabilized emulsifier with a semi-solid phase(cream) in an emulsified phase of interfacial activity. The bis-(diethylene glycol monoethyl ether succinate(hereinafter, called as BDGS) with a high yield of more than 95% was obtained. As this has a property containing amphoteric emulsified functions such as W/O type or O/W type, etc., and has a merit that can be used regardless of any emulsified phase, there is no need using other emulsified surfactant. therefore, as this has excellent skin wetability in the cosmetics industry, a product having a wider range in quality compatibility or cost saving, etc. as a humectant has been developed.

Preparation and rheological behavior of polystyrene/multi-walled carbon nanotube composites by latex technology

  • Woo, Dong-Kyun;Kim, Byung-Chul;Lee, Seong-Jae
    • Korea-Australia Rheology Journal
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    • v.21 no.3
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    • pp.185-191
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    • 2009
  • Polystyrene/multi-walled carbon nanotube (PS/MWCNT) composites were prepared by the use of latex technology. The monodisperse PS latex was synthesized by an emulsifier-free emulsion polymerization from styrene/potassium persulfate/water system in the presence of ethanol. The MWCNTs were first treated with acid mixture to eliminate impurities, dispersed in deionized water driven by ultrasonicator, and then mixed with the PS latex. From these mixtures, PS/MWCNT composites were prepared by freeze-drying and subsequent compression molding. In the small-amplitude oscillatory shear experiments, both complex viscosity and storage modulus increased with increasing MWCNT content. A pronounced effect of MWCNT content was observed, resulting in larger storage modulus and stronger yield behavior at low frequencies when compared to unmodified PS. It showed a transition from viscous to elastic behavior with increasing MWCNT content. Over the MWCNT content of 3 wt%, the storage modulus was higher than the loss modulus across all frequencies.

Influence of pH, Emulsifier Concentration, and Homogenization Condition on the Production of Stable Oil-in-Water Emulsion Droplets Coated with Fish Gelatin

  • Surh, Jeong-Hee
    • Food Science and Biotechnology
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    • v.16 no.6
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    • pp.999-1005
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    • 2007
  • An oil-in-water (O/W) emulsion [20 wt% com oil, 0.5-6.0 wt% fish gelatin (FG), pH 3.0] was produced by high pressure homogenization, and the influence of pH, protein concentration, and homogenization condition on the formation of FG-stabilized emulsions was assessed by measuring particle size distribution, electrical charge, creaming stability, microstructure, and free FG concentration in the emulsions. Optical microscopy indicated that there were some large droplets ($d>10\;{\mu}m$) in all FG-emulsions, nevertheless, the amount of large droplets tended to decrease with increasing FG concentration. More than 90% of FG was present free in the continuous phase of the emulsions. To facilitate droplet disruption and prevent droplet coalescence within the homogenizer, homogenization time was adjusted in O/W emulsions stabilized by 2.0 or 4.0 wt% FG. However, the increase in the number of pass rather promoted droplet coalescence. This study has shown that the FG may have some limited use as a protein emulsifier in O/W emulsions.

Synthesis of Functional Microspheres and Biomedical Applications (기능성 Microspheres의 합성 및 생의학적 응용)

  • Kim, J.H.;Kim, W.S.
    • Proceedings of the KOSOMBE Conference
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    • v.1993 no.05
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    • pp.7-14
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    • 1993
  • Nowadays, microspheres are expected to be applied to biomedical areas and many studies are being performed. For biomedical applications, many kinds of microspheres were synthesized by emulsion polymerization, emulsifier-free emu]sion polymerization, and emulsifier-free emulsion polymerization with ionic surface-active comonomers. Further synthesis techniques about microencapsulation and magnetic microspheres are introduced. Among the practical applications of microspheres, some interesting subjects are introduced. These include solid-phase immunoassays, labeling and identification of lymphocyte populations, extracorporeal and hemoperfusion systems, drug delivery systems, and immunomagnetic cell separation. In addition, basic theories, problems and research trends are also introduced.

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Graft Copolymerization of Poly(Methyl Methacrylate) onto Natural Rubber Latex (천연고무 Latex에 Poly(Methyl Methacrylate)의 그라프트 공중합)

  • Kim, K.S.;Shin, M.H.;Choi, S.K.;Keum, K.M.
    • Elastomers and Composites
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    • v.28 no.3
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    • pp.191-197
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    • 1993
  • The graft copolymerization of methyl methacrylate(MMA) onto natural rubber latex(NRL) initiated by t-butyl hydroperoxide(t-BHPO) was investigated in aquous medium. The grafting percentage, grafting efficiency and total conversion were observed in various reaction conditions such as monomer, initiator and emulsifier concentration, reaction temperature, reaction time and agitation speed. The optimum conditions for the graft copolymerization onto natural rubber latex were as follows ; At given monomer concentration of $3{\times}10^{-2}mole/l$, the maximum grafting percentage was appeared in the case of grading in initiator concentration of $4{\times}10^{-2}mo1e/l$ and emulsifier concentration of 0.2wt.% at $40^{\circ}C$ for 5hrs.

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A study on the Coating Structure and Printability of Coated Paper (I) - Effect of Ionic Monomer on Paper-coating Latex Properties - (도공층 구조 및 도공지의 인쇄적성에 관한 연구 (I) - 이온성 단량체가 도공용 라텍스의 물성에 미치는 영향 -)

  • Lee, Yong-Kyu
    • Journal of the Korean Wood Science and Technology
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    • v.25 no.3
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    • pp.75-82
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    • 1997
  • To improve the quality of coated paper, the continuous research to the coating components and development of alternative latices is required. Recently, amphoteric latex is getting a great concern due to their changable properties of surface charge through controlling pH and some methods have been tried to prepare amphoteric latices. This study was carried out to synthesize amphoteric latex using seeding polymerization method with low concentration emulsifier. Styrene was used as a main monomer in addition to acrylonitrile for a hydrophilic comonomer. acrylic acid for a anionic comonomer and N,N-dimethylaminoethyl methacrylate for a cationic comonomer. Particle size and viscosity of latex were greatly affected by addition of acrylic acid and ammonium persulfate as an initiator. Negative charge of latex in alkali condition was changed to zero to positive charge in around pH 4.

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