• Title/Summary/Keyword: Ternary Separation

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Simultaneous Spectrometric Determination of Caffeic Acid, Gallic Acid, and Quercetin in Some Aromatic Herbs, Using Chemometric Tools

  • Kachbi, Abdelmalek;Abdelfettah-Kara, Dalila;Benamor, Mohamed;Senhadji-Kebiche, Ounissa
    • Journal of the Korean Chemical Society
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    • v.65 no.4
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    • pp.254-259
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    • 2021
  • The purpose of this work is the development of a method for an effective, less expensive, rapid, and simultaneous determination of three phenolic compounds (caffeic acid, gallic acid, and quercetin) widely present in food resources and known for their antioxidant powers. The method relies on partial least squares (PLS) calibration of UV-visible spectroscopic data. This model was applied to simultaneously determine, the concentrations of caffeic acid (CA), gallic acid (GA), and quercetin (Q) in six herb infusion extracts: basil, chive, laurel, mint, parsley, and thyme. A wavelength range (250-400) nm, and an experimental calibration matrix with 21 samples of ternary mixtures composed of CA (6.0-21.0 mg/L), GA (10.0-35.2 mg/L), and Q (6.4-17.5 mg/L) were chosen. Spectroscopic data were mean-centered before calibration. Two latent variables were determined using the contiguous block cross-validation procedure after calculating the root mean square error cross-validation RMSECV. Other statistic parameters: RMSEP, R2, and Recovery (%) were used to determine the predictive ability of the model. The results obtained demonstrated that UV-visible spectrometry and PLS regression were successfully applied to simultaneously quantify the three phenolic compounds in synthetic ternary mixtures. Moreover, the concentrations of CA, GA and Q in herb infusion extracts were easily predicted and found to be 3.918-18.055, 9.014-23.825, and 9.040-13.350 mg/g of dry sample, respectively.

Chromatographic Separation of Maltopentaose from Maltooligosaccharides

  • Lee, Jae-Wook;Kwon, Tae-Ouk;Moon, Il-Shik
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.8 no.1
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    • pp.47-53
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    • 2003
  • An experimental study on the chromatographic separation of maltopentaose from a mixture, including glucose, maltose, maltotriose, and maltopentaose, was carried out in a nonionic polymeric sorbent column while varying the operating conditions, such as the solution pH, buffer contents, and isopropyl alcohol (1PA) concentration. Unlike the pH and buffer contents, the IPA concentration had a Significant impact on the single component chromatograms for maltopentaose. The retention times of the maltooligosaccharides with the nonionic polymeric sorbent Sp207 were in the following order: glucose < maltose < maltotriose < maltopentaose. From the experimental binary, ternary, and quaternary chromatograms, gradient chromatographic separation with a changing IPA concentration as a function of time was required to obtain high-purity maltopentaose and reduce the elution time.

Thermally Stabilized Porous Nickel Support of Palladium Based Alloy Membrane for High Temperature Hydrogen Separation

  • Ryi, Shin-Kun;Park, Jong-Soo;Cho, Sung-Ho;Hwang, Kyong-Ran;Kim, Sung-Hyun
    • Corrosion Science and Technology
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    • v.6 no.3
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    • pp.133-139
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    • 2007
  • Nickel powder was coated with aluminum nitrate solution to increase the thermal stability of a porous nickel support and control the nickel content in the Pd-Cu-Ni ternary alloyed membrane. Raw nickel powder and alumina coated nickel powder were uniaxialy pressed by home made press with metal cylindrical mold. Though the used nickel powder prepared by pulsed wire evaporation (PWE) method has a good thermal stability, the porous nickel support was too much sintered and the pores of porous nickel support was plugged at high temperature (over $800^{\circ}C$) making it not suitable for the porous support of a palladium based composite membrane. In order to overcome this problem, the nickel powder was coated by alumina and alumina modified porous nickel support resists up to $1000^{\circ}C$ without pore destruction. Furthermore, the compositions of Pd-Cu-Ni ternary alloy membrane prepared by magnetron sputtering and Cu-reflow could be controlled by not only Cu-reflow temperature but also alumina coating amount. SEM analysis and mercury porosimeter analysis evidenced that the alumina coated on the surface of nickel powder interrupted nickel sintering.

Relation between Huggins Constant and Compatibility of Binary Polymer Mixtures in the Aqueous Ternary Systems

  • Isamu Inamura;Makoto Kittaka;Tatsuya Aikou;Kazuhiko Akiyama;Tomoyuki Matsuyama;Masatsugu Hiroto;Hirade, Ken-ichi;Yuji Jinbo
    • Macromolecular Research
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    • v.12 no.2
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    • pp.246-250
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    • 2004
  • We have classified a number of aqueous ternary systems containing two different polymers into three types by focusing on the deviation of the Huggins constant k'from the additivity line. Systems of type I have negative deviations of k'; the repulsive interaction between the two different polymers dominates. In systems of type II, k' almost follows the additivity relation; the repulsive and attractive interactions between the two different polymers are balancing. Type III systems have positive deviations of k'; the attractive interactions are relatively dominant. This classification of systems is supported by the fact that the positive and negative deviations of k' from the additivity line also correspond to the sign of interaction parameter between polymer 2 and 3, Δb$\_$23/. Furthermore, we have verified the relatively high compatibility between dextran and poly(vinyl alcohol) by determining the binodal concentration of a liquid-liquid phase separation for a water/dextran/poly(vinyl alcohol) system, which is classified as type III. Thus, we found that the compositional dependence of k' closely relates to the compatibility of binary polymer mixtures in aqueous ternary systems.

Separation of D and L Amino Acids by High-Performance Liquid Chromatography

  • Lee, Sun-Haing;Ryu, Jae-Wook;Park ,Kyoung-Sug
    • Bulletin of the Korean Chemical Society
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    • v.7 no.1
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    • pp.45-50
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    • 1986
  • Separation of optical isomers of some derivatives of amino acids by reversed-phase HPLC has been accomplished by adding a chelate of an optically active amino acid to copper(Ⅱ) to the mobile phase. Cu(Ⅱ) complexes of L-proline and L-hydroxyproline in the mobile phase showed different degrees of separation. Optical isomers of DNS derivatives of amino acids are selectively separated, but those of several other derivatives are not at all. The kinds of buffer agents, the pH, and the concentrations of acetonitrile and the Cu(Ⅱ) ligand all affect the separations. The elution behavior between D and L DNS-amino acids appears to depend on the alkyl side chain of the amino acids. A chromatographic mechanism is proposed that is based on a stereospecificity of the formation of ternary complexes by the D, L-DNS-amino acids and the chiral additive associated with the stationary phase. The steric effects of the ligand exchange reactions are related with the feasibility of cis and/or trans attack of the amino acids to the binary chiral chelate retained on the stationary phase.

Spectrophotometric Determination of Scandium(III) in Monazite after Separation Using Amberlite IRC 718 Chelating Resin

  • 박찬일;차기원
    • Bulletin of the Korean Chemical Society
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    • v.20 no.12
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    • pp.1409-1412
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    • 1999
  • The spectrophotometric determination method of scandium with eriochrome cyanine R (ECR) and the composition ratio of the complex were investigated in the presence of surfactants. A volume of 5 mL of 1.0×$10^{-3}$ M ECR and 10 mL of 2.0×$10^{-4}$ M CTMAB are necessary for the determination of 1.0×$10 ^{-7}$ ~ 3.0×$10^{-6}$ M Sc(III) at pH 6.5. The apparent molar absorption coefficient of the Sc(III)-ECR-CTMAB, ternary complex at 610 nm is 5.6×$10^5$ $mol^{-1}cm{-1}$L and its detection limit is 1.0×$10^{-7}$ M. Separation studies were conducted by the column method. The effect of pH, elution solution and the influence of rare earth elements as interferents was discussed. Their separation was carried out in 0.1 M HCl-50% methanol solution and 1.0 M HCl media. The method was applied for the determination of Sc(III) in monazite.

A computer simulation of the peso-scale microstructural evolution in the ternary Ni- ${Ni_3}Al-{Ni_3}V$ system (${Ni_3}Al-{Ni_3}V$ 준이원계 합금 포함 삼원계 시스템에서의 meso-scale 미세구조의 전산 모사에 관한 연구)

  • Park, Sung-Il;Lee, Hyuck-Mo
    • Korean Journal of Materials Research
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    • v.11 no.11
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    • pp.947-952
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    • 2001
  • The meso-scale microstructure of the $Ni-Ni_3Al- Ni_3V$ system is crucial to obtain both high strength and high toughness. Its evolution may be predicted with the aid of computer simulation of the compositional separation for heat-treated alloys. In this study, computer simulations of the hypothetical A-B-C ternary system, which is similar to the $Ni-Ni_3Al- Ni_3V$ system in terms of phase equilibria, have been performed using the kinetic modeling. Simulated morphologies were changed with nominal compositions and model parameters. It was showed the current model was useful and the more realistic model was proposed.

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NaY Zeolite Membrane Pervaporation for Dehydration from Ethylacetate Manufacturing Process (에틸아세테이트 생산 공정의 탈수를 위한 NaY 제올라이트 분리막 투과증발)

  • Ahn, Hyoseong;Lee, Hyeryeon;Lee, Yongtaek
    • Korean Chemical Engineering Research
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    • v.43 no.3
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    • pp.366-370
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    • 2005
  • Pervaporation process using a NaY zeolite membrane was applied for separation of water generated in an esterification process as a byproduct. From the binary mixture of water and either ethyl acetate or acetic acid and the ternary mixture of water, ethanol and ethyl acetate which might be present in an esterification reaction for manufacturing ethyl acetate, water was separated by the membrane pervaporation. It was investigated how the operating parameters such as an organic concentration and a temperature affected the permeate flux and the separation factor of water. For the feed mixture of water/ethyl acetate, the total flux and the separation factor of water were observed to be $930-5,000g/m^2/hr$ and 3,700-8,000, respectively. Also it was found for ternary mixtures of water/ethanol/ethyl acetate that the total flux was $1,300-3,900g/m^2/hr$ and the separation factor was 530-1,600. A pervaporation process might be applied in an esterification process since both the total flux and the separation factor of water through the NaY zeolite membrane were shown to be very high.

Retention Behavior of the Phenols on the Binary and Ternary Mobile Phases in Reversed-Phase Liquid Chromatography (역상 액체크로마토그래피에 있어서 이성분과 삼성분 이동상에 대한 페놀류의 머무름 거동)

  • Dae Sub Oh;Sun Haing Lee;Soo Han Kim;Sang Tae Kim
    • Journal of the Korean Chemical Society
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    • v.30 no.4
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    • pp.352-358
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    • 1986
  • An extensive experimental survey on the retention behaviors of phenols in the binary solvent system such as methanol-water, acetonitrile-water and tetrahydrofuran-water as well as the ternary solvent system such as methanol-acetonitrile-water and methanol-tetrahydrofuran-water is presented. A linear equation, which describes the capacity factor as a function of the solvent composition in the mobile phase and is able to predict the retention behaviors of phenols, was obtained. The iso-eluotropic lines for the binary and ternary solvent system are based on the equal strength of the methanol-water solvent which shows an optimum separation of the phenols used. The specific effect of each solute in the binary solvent system appeared to be larger than those in the ternary system.

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Phase Equilibrium Study on the Ternary System of SBR/EPDM/Solvent (SBR, EPDM 및 Solvent로 이루어진 삼성분계의 상 평형에 관한 연구)

  • Go, Jin-Hwan;Park, Byung-Ho
    • Elastomers and Composites
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    • v.37 no.4
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    • pp.211-216
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    • 2002
  • The polymer-polymer interaction parameter, x 23t, of the styrene-butadiene polymer (SBR) and ethylene-propylene-diene terpolymer (EPDM) was investigated by observing the phase behavior of the ternary system of SBR/EPDM/solvent. The solvent used in this study was benzene acting as a good solvent for SBR but as a poor solvent for EPDM. Ternary solutions with various concentrations and mixing ratios of the two component polymers were separated into two phases by temperature change The cloud point curves (CPC) showed that the differerence of solvent affinities toward each polymer and the repulsive interaction between two polymers considerably affect the shape of CPC near 15℃. In the temperature range of 5℃ ~ 25℃, incompatible behaviours arised from both the difference of mixing ratios and concentration were clearly observed. Also the phase separation temperature greatly influenced on the composition of each separated phase. The calculated x 23t values from Flory-Huggins theory were in the range of 0.6301 ~ 1.0775, which suggest that the SBR/EPDM systems are incompatible.