• Title/Summary/Keyword: solvent-free

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Nutritional Quality and Physicochemical Characteristics of Defatted Bovine Liver Treated by Supercritical Carbon Dioxide and Organic Solvent

  • Kang, Sung-Won;Kim, Hye-Min;Rahman, M. Shafiur;Kim, Ah-Na;Yang, Han-Sul;Choi, Sung-Gil
    • Food Science of Animal Resources
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    • v.37 no.1
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    • pp.29-37
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    • 2017

  • Defatted bovine liver (DBL) is a potential source of protein and minerals. Supercritical carbon dioxide ($SC-CO_2$) and a traditional organic solvent method were used to remove lipid from bovine liver, and the quality characteristics of a control bovine liver (CBL), bovine liver defatted by $SC-CO_2$ ($DBLSC-CO_2$) at different pressures, and bovine liver defatted by organic solvent (DBL-OS) were compared. The $DBLSC-CO_2$ samples had significantly higher (p<0.05) protein, amino acid, carbohydrate, and fiber contents than CBL and DBL-OS. There was a higher yield of lipid from CBL when using $SC-CO_2$ than the organic solvent method. SDS-PAGE analysis demonstrated that the CBL and $DBLSC-CO_2$ had protein bands of a similar intensity and area, whereas DBL-OS appeared extremely poor bands or no bands due to the degradation of proteins, particularly in the 50 to 75 kDa and 20 to 25 kDa molecular weight ranges. In addition, $DBLSC-CO_2$ was shown to have superior functional properties in terms of total soluble content, water and oil absorption, and foaming and emulsification properties. Therefore, $SC-CO_2$ treatment offers a nutritionally and environmentally friendly approach for the removal of lipid from high protein food sources. In addition, $SC-CO_2$ may be a better substitute of traditional organic solvent extraction for producing more stable and high quality foods with high-protein, fat-free, and low calorie contents.

  • https://doi.org/10.5851/kosfa.2017.37.1.29 인용 PDF KSCI

Solvent Effects on the Solvolysis of cis-$[Co(en)_2ClNO_2]^+$ Ion and Its Mechanism (cis-$[Co(en)_2ClNO_2]^+$ 착이온의 가용매 분해반응에 미치는 용매의 영향과 그 반응 메카니즘)

  • Jong-Jae Chung;Young-Ho Park
    • Journal of the Korean Chemical Society
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    • v.30 no.1
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    • pp.3-8
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    • 1986

  • The investigation of the effect of solvent structure on the first-order solvolysis of cis-$[Co(en)_2ClNO_2]^+$ion has been extended to water + co-solvent mixtures where the co-solvents are glycerol, ethylene glycol, isopropyl alcohol and t-butyl alcohol. Rates of solvolysis have been evaluated by spectrophotometric method at temperature 25∼30$^{\circ}$C. The polarity of solvent has influence on the variation of rate constant. The non-linear plot of the rate constant in log scale versus $\frac{D-1}{2D+1}$ implies that change in solvent structure with composition plays an important role in determining the variation of rate constant. The linearity of the plot of the rate constant in log scale versus the Grundwald-Winstein Y factor confirms that the solvolysis is an Id-type process with considerable extension of the metal chloride bond in the transition state. In the Kivinen equation the slope of the plot of log k versus $log(H_2O)$ suggests that the solvolysis is also an Id-type process. The application of free energy cycle shows that the effect of solvent structure is greater in the transition state than in the initial state.

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Technology for the Preparation of Ash-free Coal from Low Rank Coal(LRC) (저등급 석탄으로부터 초청정석탄 제조 기술)

  • Lee, Sihyun;Kim, Sangdo
    • Korean Chemical Engineering Research
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    • v.46 no.3
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    • pp.443-450
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    • 2008

  • Efficient use of low rank coals (LRC) have been investigated as a method to cope with recent high oil price. Among the coals used in industry, lignite and sub-bituminous coals are belong to the LRC, and have abundant deposit and are distributed worldwide, but high moisture contents and self ignition properties inhibits their utilization. In this paper, chemical coal cleaning to produce ash-free coal from LRC has been investigated. Two technologies, that is, UCC(Ultra Clean Coal) process removing ash from coal and Hyper Coal process extracting combustibles from coal were compared with. UCC process has merits of simple and reliable when it compared with Hyper Coal process, but the remaining ash contents werehigher than Hyper Coal. Hyper Coal has ash contents under the 200ppm when raw coal is treated with appropriate solvent and ion exchange materials to remove alkali materials in extracted solution. The ash-free coal which is similar grade with oil can be used as alternate oil in the industry, and also used as a high grade fuel for IGCC, IGFC and other advanced combustion technology.

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Antioxidative Properties of Phenolic Compounds Extracted from Black Rice (흑미 색소물질에 함유된 페놀화합물의 항산화 특성)

  • 정영아;이재권
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.32 no.6
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    • pp.948-951
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    • 2003

  • The composition and antioxidative effects of phenolic compounds in black rice were studied. The contents of free and bound phenolic compounds extracted from black rice were 845.4 and 401.6 mg respectively per 100g sample weight. Free phenolic compounds had higher antioxidation ability than those of bound phenolic compounds. Solvent fractionation of free phenolic compounds revealed that butanol fraction had the highest phenolic compounds contents and antioxidative activity among other solvent fractions. Although butanol fraction showed lower lipid peroxidation inhibition (LPI) ability than that of $\alpha$-tocopherol and BHT, free radical scavenging ability was much higher than that of $\alpha$-tocopherol and BHT, as evidenced by electron donating ability (EDA) and benzoic acid hydroxylation inhibition (BAHI) assays.

  • https://doi.org/10.3746/jkfn.2003.32.6.948 인용 PDF KSCI