• Title, Summary, Keyword: natural coagulant

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Effect of Various Coagulants on the Texture and the Sensory Properties of Milk Curd (응고제가 우유두부의 물성 및 관능적 특성에 미치는 영향)

  • Woo Na-Ri Yah;Lee Min-Sun;Park Soo-Jin;Kang Myung-Hwa
    • Journal of the East Asian Society of Dietary Life
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    • v.14 no.5
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    • pp.449-456
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    • 2004
  • Different types of coagulant and characteristics of its concentration added in the process of making milk curd were compared in this study. The pH of whey decreased when the amount of coagulant increased. The turbidity of whey was decreased when 5% of acetic acid and lemon juice were put into as coagulants. The texture of milk curd made with cow's milk and skim milk was measured the highest when acetic acid and lemon juice were added at 3, 5% of their concentration. The fracturability of milk curd made only with cow's milk decreased as the concentration of each coagulant increased. The cohesiveness was decreased as concentration of coagulant increased. The springiness was slightly changed depending on its coagulant but didn't show much of difference. The gummminess of milk curd made with cow's milk was increased when 3, 5% of coagulant was added. The result of sensory evaluation of milk curd showed that preference of milk curd wasn't depending on types of milk nor its coagulant. Also, flavor preference showed better when lemon juice was added. Preference in texture of milk curd was the highest made with cow's milk and skim milk. Preference in taste was high when 10% of lemon juice was added to skim milk and preference in its appearance showed higher when the alum was added as a coagulant to both cow's milk and skim milk than other coagulants.

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Effects of magnetic ion exchange resin with PACI coagulation on removal of natural organic matter and MF fouling (자성체 이온교환 수지와 PACI 응집에 의한 국내 주요 수계 내 자연유기물 제거 특성 및 막오염 저감 효과)

  • Choi, Yang Hun;Jeong, Young Mi;Kim, Young Sam;Lee, Seung Ryul;Kweon, Ji Hyang;Kwon, Soon Buhm
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.1
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    • pp.131-140
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    • 2008
  • The application of magnetic ion exchange resin($MIEX^{(R)}$) is effective for natural organic matter(NOM) removal and for control of the formation of disinfection byproducts(DBPs). NOM removal is also enhanced by adding $MIEX^{(R)}$ with coagulant such as polyaluminium chloride(PACl) in conventional drinking water treatment systems. In the application of $MIEX^{(R)}$, it is important to understand changes of NOM characteristics such as hydrophobicity and molecular weight distributions with $MIEX^{(R)}$ or $MIEX^{(R)}$+coagulant treatment.To observe characteristics of NOM by treatment with $MIEX^{(R)}$ or $MIEX^{(R)}$+coagulant, four major drinking water sources were employed. Results showed that the addition of $MIEX^{(R)}$ to coagulation significantly reduced the amount of coagulant required for the optimum removal of dissolved organic matter(DOC) and turbidity in the all four waters. The DOC removal was also increased approximately 20%, compared to coagulant treatment alone. The process with $MIEX^{(R)}$ and coagulant showed that complementary removal of hydrophobic and hydrophilic fraction of DOC. The combined processes preferentially removed the fractions of intermediate (3,000-10,000 Da) and low (< 500 Da) molecular weight. The microfiltration test showed that membrane cake resistance was decreased for waters with flocs from $MIEX^{(R)}$+coagulant. A porous layer was formed to $MIEX^{(R)}$ on the membrane surface and the layer consequently inhibited settling of coagulant flocs, which could act on a foulant.

Synthesis and Biological Activity of Aspirin Derivatives

  • Cha, Bae-Cheon;Lee, Seung-Bae
    • Archives of Pharmacal Research
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    • v.23 no.2
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    • pp.116-120
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    • 2000
  • Aspirin has been widely used as analgesic and anti-inflammatory drug. Recently, it was elucidated that aspirin have anti-coaggregatory effect in low dose. This study was carried out to investigate the synthesis of aspirin derivatives from aspirin and aromatic compound of antioxidant and its biological activities. Synthesis of aspirin derivatives was prepared by esterification in the presence of 1, 1-carbonyldiimidazole. Biological activities was examined using effect of anti-coagulant on bleeding time, effect of antioxidant and effect of anti-platelet aggregation. As a result, SJ-101 showed strong antioxidative activity and anti-coagulant activity among four compounds. Anti-platelet aggregation of SJ-101 was examined by collagen, ADP, PAF method. SJ-101 exhibited more stronger activity to aspirin at collagen aggregation reaction. These finding demonstrates that SJ-101 is usefull as care drug of aging and old-disease because of its has antioxidant activity, anti-coagulant activity and anti-platelet activity.

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The Effect of Coagulant and Molecular Weight on the Wet Spinnability of Regenerated Silk Fibroin solution

  • Yoo, Young-Jin;Kim, Ung-Jin;Um, In-Chul
    • International Journal of Industrial Entomology
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    • v.21 no.1
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    • pp.145-150
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    • 2010
  • The regenerated silk fibroin with various molecular weights (MW) was prepared by different dissolution condition and the effect of coagulant on the wet spinnability of the various MW silk fibroin solutions dissolved in formic acid was investigated by the observation of wet spun filament in coagulant and the measurement of maximum draw ratio. The observation on the wet spun filament in coagulation bath revealed that good fibers without bead were formed in a high MW and a very high MW silk fibroin samples. In contrast, beads were observed in the silk fibroin sample with medium MW. The maximum draw ratio of wet spun silk fibroin filament decreased with MW reduction. The decrease of maximum draw ratio in isopropanol, acetone, DMF and THF was remarkably higher than that in methanol and ethanol, indicating that the coagulant type strongly influenced the wet spinnability. The two simple evaluation methods used in this study showed complementary information for wet spinnability: (a) The observation of filament in coagulant was effective to check a continuous fiber formation and a bead formation, and (b) the maximum draw ratio measurement was useful to examine the post drawing ability related to molecular orientation.

A Study on Bulking Change of Dredged Soils by Pump Dredger (펌프준설에 의한 준설토의 체적변화에 관한 연구)

  • Kim, Chan-Soo;Yoon, Gil-Lim;Park, Heung-Gyu
    • Journal of the Korean Geoenvironmental Society
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    • v.5 no.4
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    • pp.5-11
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    • 2004
  • When settled sediments in natural condition for long time were dredged by dredging process, it is natural that bulking change between sediments and dredged soils is affected by chemical injection; coagulant. Dredged sediments used in this study were sampled in the lagoon "Young rang lake" located at the east coast Sokcho city and the bulking change of dredged soils is quantitatively analysed by changing of the clay content and the amount of the flocculant and coagulant. From the experimental results, the bulking of dredged soils increased 1.69 times on the average bulking of settled sediments in natural condition in the case of the optimum chemicals addition.

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The Effect of Coagulant on the Post Drawing and Morphology of Wet Spun Regenerated SF/Nylon 6 Blend Filaments

  • Um, In-Chul
    • International Journal of Industrial Entomology
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    • v.16 no.2
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    • pp.61-66
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    • 2008
  • In this paper, the regenerated silk fibroin (SF)/nylon 6 blend filaments were fabricated using wet spinning technique and the effect of coagulant on the post drawing and morphology of blend filaments was investigated. In the result of wet spinnability, methanol, acetone, DMF, and THF showed relatively good coagulation strength and fiber formation for the regenerated SF. On the contrary, they did not exhibit strong enough to produce a uniform nylon 6 filament due to the lack of coagulation strength. In the examination of post drawing performance, methanol showed the highest maximum draw ratio of the blend filament over all blend ratios. The maximum draw ratio of SF/nylon 6 blend filaments decreased with the reduction of SF content regardless of type of coagulant. SEM observation showed the consistent result with that of post-drawing performance. As SF content decreased, the uniform and regular structure was changed to irregular one. In particular, the severe macro-phase separation between SF and nylon 6 could be detected in the 50/50 SF/nylon 6 blend filaments coagulated in methanol and THF.

Platelet Anti-aggregating and Anti-oxidative Activities of 12-O-(4'-O-methyl-galloyl)-bergenin, a Novel Compound Isolated from Crassula cv. "Himaturi"

  • Lee, Yong-Yook;Jang, Dae-Song;Jin, Jing-Ling;YunChoi, Hye-Sook
    • Proceedings of the PSK Conference
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    • pp.193.3-193
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    • 2003
  • Platelets play critical roles in both hemostasis and thrombosis. It was reported that platelet aggregation is associated with an increase in superoxide production and can be inhibited by hydroxyl radical scavengers. In the course of our search for the anti-platelet, anti-coagulant and/or anti-oxidative components from plants, the MeOH extract of Crassula cv. "Himaturi" (Crassulaceae) was observed to have both anti-aggregatory and anti-coagulant effects. A novel compound, 12-O-(4'-O-methyl-galloyl)-bergenin (1), was isolated as an active component from the EtOAC soluble fraction. (omitted)

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Platelet Anti-aggregatory Effects of Coumarins from the Roots of Angelica genuflexa and A. gigas

  • Lee, Yong-Yook;Lee, Sang-Hyun;Jin, Jing-Ling;ChoiYun, Hye-Sook
    • Proceedings of the PSK Conference
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    • pp.196.1-196
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    • 2003
  • Angelica genuflexa (Umbelliferae) is a perennial herbaceous plant which has also been variously reported as A. koreana and Ostericum koreanum. The MeOH extract was reported to have strong anti-thrombotic potential in the acute thrombosis model. In our preliminary testing, the MeOH extract and one of the solvent fractions (90% MeOH fr.) were observed to have both platelet anti-aggregating and anti-coagulant effects. Five coumarins, isoimperatorin (1), pabulenol (2), isooxypeucedanin (3), oxypeucedanin hydrate (4) and osthol (5) were isolated from the MeOH extract of Angelica genuflexa in the course of searching for anti-platelet and anti-coagulant components. (omitted)

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