• Title, Summary, Keyword: homogenizing pressure

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Emulsion Stability of Soymilk Produced by the Varied Homogenizing Pressure (균질기 압력을 변화시켜 제조한 두유의 유화안정성)

  • Lee, Kyung-Seok;Kim, Kyung-Tae;Jung, Yong-Myun;Lee, Ki-Young
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.35 no.10
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    • pp.1434-1438
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    • 2006
  • The purpose of this study was to make soy milk without using any food additives. First, it was attempted to find the effects of homogenizing pressure on the emulsion stability of soy milk without addition of monoglyceride. The soy milk was made with the ratio of bean and water as 1:8, and the yields of soy milk was measured to be 5.87 fold of the beans used. lifter making soy milk by differentiated pressure of the homogenizer at $50kg/cm^2,\;100kg/cm^2,\;150kg/cm^2\;and\;200kg/cm^2$, general composition of the center part of soy milk was analysed. The analysis results indicated that the lipid content increased by the increase of the emulsion pressure. Moreover, the suspension stability, emulsion stability and viscosity also increased by the increase of the emulsion pressure. Therefore, we thought that the production of soy milk without adding any emulsifier was possible only by homogenizing at higher pressure over $150kg/cm^2$.

Process Evaluation in Preparing Oil in Water Microemulsion by Dynamic Light Scattering Method (Dynamic Light Scattering Method를 이용한 수중유형 Microemulsion의 제조조건 평가)

  • Min, Shin-Hong;Yang, Joong-Ik;Kwon, Jong-Won;Jeong, Dae-Sik;Jeong, Yeoub
    • Journal of Pharmaceutical Investigation
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    • v.17 no.1
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    • pp.41-46
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    • 1987
  • Oil in water microemulsion containing soybean oil and egg phosphatide was prepared by vacuum high shear mixing and high pressure homogenizing. The laser particle sizer, Coulter counter and photomicroscope were used to determine the particle size distribution at each cycle of homogenizing. Particularly, the laser particle sizer(dynamic light scattering method) was applied to the study of particle size distribution behavior below $1\;{\mu}m$. It was found that the particle size distribution below $1\;{\mu}m$ was shifted to lower size range as the number of passing cycle was increased. Beyond the 7th cycle, however, the particle size distribution was not varied.

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The Preparation and Evaluation of Oil in Water Microemulsion (수중유형(水中油型) Microemulsion의 제조 및 평가)

  • Min, Shin-Hong;Yang, Joong-Ik;Kwon, Jong-Won;Jheong, Dae-Sik;Jheong, Yeoub
    • Journal of Pharmaceutical Investigation
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    • v.16 no.2
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    • pp.68-71
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    • 1986
  • Oil in water microemulsion which has many pharmaceutical applications was prepared and evaluated. As oil sources and emulsifier, two grades of oil and egg phosphatide were used, respectively. Vacuum high shear mixing and high pressure homogenizing were performed and in the homogenizing step, effect of the number of passes in the homogenizer on the stability of microemulsion was studied, using Coulter counter, photographic microscope and pH-meter. From above results, it was concluded that the stability of microemulsion made of refined soy-bean oil was better than that of food grade soybean oil and by five passes in the homogenizer at 6,000 psi, we could make stable microemulsion with average particle diameter below $1\;{\mu}m$, with no particle above $5\;{\mu}m$ and no significant change during 6 weeks stored.

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Thermo-sensitive lipid nanoparticles as a novel topical delivery system of retinol

  • Jee, Jun-Pil;Lee, Mi-Kyung;Kim, Chong-Kook
    • Proceedings of the PSK Conference
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    • pp.425.2-425
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    • 2002
  • The purpose of this study was to prepare thermo-sensitive solid-lipid nanoparticles (SLNs) with a lipid melted at human body temperature and to evaluate physicochemical properties of SLNs containing retinol. anti-wrinkle agent. as a model drug. SLNs were prepared using a high pressure homogenizing method. The SLNs were composed of retinol as a model drug. thermo-sensitive lipid (DS-CBS) as a lipid core. and egg phosphatidylcholine and Tween 80 as surfactants. Manufacturing variables such as homogenization pressure. (omitted)

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Rheological Study on Oil in Water Microemulsion (수중유형 Miroemulsion의 유동학적 연구)

  • Min, Shin-Hong;Yang, Joong-Ik;Kwon, Jong-Won;Jeong, Dae-Sik;Jeong, Yeoub
    • Journal of Pharmaceutical Investigation
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    • v.17 no.1
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    • pp.38-40
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    • 1987
  • To optimize the preparation condition of oil in water microemulsion rheological method was used. The viscosity-temperature curve of refined soybean oil was recorded and from this result microemulsion was prepared at various temperatures and evaluated by Coulter counter during 3 weeks. The difference in rheograms of crude emulsion and the microemulsion varying the number of passes in the homogenizer was also examined. From above experiments following conclusions were obtained. 1) Through all the process, temperature was an important factor and the optimum was $60-80^{\circ}C$. 2) By first pass in the homogenizer, most oil droplets were finely dispersed. 3) In the homogenizing step the higher pressure results in the finer dispersion but as the pressure goes up, the differential efficiency of dispersion was decreased.

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A Comparison of Emulsion Stability as Non-Dairy Coffee Whitener Preparation (비 유지방 분말크림 제조시 유화 안정성의 비교)

  • 이병영
    • The Korean Journal of Food And Nutrition
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    • v.4 no.1
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    • pp.91-98
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    • 1991
  • This study was carried out to investigate the effect of the emulsion stability according to the quantity of emulsifiers and the pressure of homogenizer in coffee whitener preparation. The results of this study are as follow : 1. To obtain a standard emulsifier, the ratio of mono and triglycerides(Atoms 150), sorbitan monostearate (Span 60) and polyoxylene(20) sorbitan monostearate(Tween 60) was 60 . 20 : 20 and the optimum quantity was about 0.9fS for stable emulsion. 2. Characteristics as coffee whitner were markedly improved when the pressure of homogenizer was 200∼250kg1cmz and homogenizing times are over 4. 3. The good whitening capacity was showed when fat glouble's average diameter was under 0.5 Um.

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Influence of Xanthan, Emulsification Temperature, and Environmental Stresses on the Preparation of Water-in-Corn Oil Emulsions Droplets Coated by Polyglycerol Polyricinoleate

  • Surh, Jeong-Hee
    • Food Science and Biotechnology
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    • v.18 no.2
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    • pp.299-306
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    • 2009
  • The purpose of this study was to prepare stable water-in-corn oil (W/O) emulsion droplets coated by polyglycerol polyricinoleate (PGPR). W/O emulsions (20 wt% aqueous phase, 80 wt% oil phase containing 8 wt% PGPR) were produced by high pressure homogenization (Emulsions 1), however, appreciable amount of relatively large water droplets (d>$10{\mu}m$) were found. To facilitate droplet disruption, viscosity of each phase was adjusted: (i) increased the viscosity of aqueous phase by adding 0.1 wt% xanthan (Emulsions 2); (ii) decreased the viscosity of oil phase and aqueous phase by heating them separately at $50^{\circ}C$ for 1 hr immediately before emulsification (Emulsions 3). Homogenizing at the elevated temperature clearly led to a smaller water droplet size, whereas xanthan neither improved nor adversely affected on the microstructures of the emulsions. In addition, the Emulsions 3 had good stability to droplet aggregation under shearing stress, thermal processing, and long term storage.

Studies on Stability of Soymilk Suspension (두유(豆乳)의 현탁안정성에 관한 연구)

  • Kim, Eun-Soo;Jo, Jae-Sun
    • Korean Journal of Food Science and Technology
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    • v.22 no.3
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    • pp.312-318
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    • 1990
  • The effects of blanching, homogenization and heat sterilization on the stability of soymilk suspension were investigated by determination of nitrogen solubility index(NSI) of suspension and measuring the volume of precipitates and cream separated. The results obtained were that the NSI was decreased as the blanching temperature increased from $50^{\circ}C\;to\;80^{\circ}C$. The soybean particles having $8{\mu}$ by grinding showed more stable soymilk than that of $53{\mu}$. The stability was increased as the homogenizing pressure increased to $200kg/cm^2$ and repeated homogenizing process gave more stability than single one. The sterilization resulted a significant decrease in stability as it was heated at $120^{\circ}C-125^{\circ}C$ for more than 30 minutes.

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A Study on Nitridation and Oxidation Reaction of Titanium Powder (금속티타늄분말의 질화반응과 산화반응에 관한 연구)

  • Lee, Young-Ki;Sohn, Yong-Un;Cho, Young-Soo;Kim, Yong Seog;Kim, Suk-Yoon
    • Journal of the Korean Society for Heat Treatment
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    • v.8 no.2
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    • pp.137-148
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    • 1995
  • The nitridation kinetics of titanium powder were studied by isothermal and non-isothermal (dynamic) methods in high purity nitrogen under I atm pressure. For the comparison with nitridation, the oxidation kinetics of titanium powder were also studied in dry oxygen at I atm pressure. An automatic recording electrobalance was used to measure the weight gain as a function of time and temperature. For the reaction with nitrogen, the nitride was formed at over $700^{\circ}C$. The reaction with nitrogen followed the parabolic rate law, and the activation energy was calculated to be 31 kcal/mol in the isothermal method (above $900^{\circ}C$). The non-stoichiometric TiNx has been synthesized by the nitridation at a proper temperature and time, followed by the homogenizing treatment above $1100^{\circ}C$. In comparison with the stoichiometric $TiN_{1.0}$ and the non-stoichiometric TiNx ($TiN_{0.5}$ and $TiN_{0.65}$), the hot oxidation characteristics of the former is superior to that of the latter. However, both non-stoichiometric nitrides make little difference in the hot oxidation characteristics.

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Effect of Brazing Process Variables on joining Characteristics of Ni-based Superalloy (니켈기 초합금의 접합특성에 미치는 브레이징 공정변수의 영향)

  • Kim Gyeong-Ho;Kim Gwang-Ho;Lee Min-Gu;Lee Ho-Jin;Kim Heung-Hoi;Kim Suk-Hwan
    • Proceedings of the KWS Conference
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    • pp.266-268
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    • 2006
  • The effects of the brazing temperature and homogenizing time for brazed specimens on the joint of Ni-based superalloys such as Haynes 250, Inconel 617 and Hastelloy-X were investigated. The brazing alloy is nickel base MBF 15. The foil had a thickness of $38{\mu}m$, which was used two sheets of that for the all experiments. The experimental brazing was carried out by a brazing process in a vacuum of approximately $2{\times}10^{-5}$ Torr, an applied pressure of about 0.74MPa and the three kinds of brazing temperatures were 1100, 1150, and $1190^{\circ}C$ for a holding time of 5 to 1440 minutes. Microstructural observations were made on the cross-sectional samples by using an optical microscope(OM), scanning electron microscope(SEM), and electron probe X-ray microanalyzer(EPMA). The tensile tests were performed at room temperature with a cross head speed 1.5 mm/min according to ASTM E8M. The results show that excellent joint tensile strengths of as high as 788MPa were obtained when processed at $1190^{\circ}C$ for 5 minutes.

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