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박정오,홍재진 대한임상검사과학회 2003 대한임상검사과학회지(KJCLS) Vol.35 No.1
This paper studies amino acid separation using a H2O-CH2Cl2-H2O liquid membrane system. A CH2Cl2 layer is modified and 1-butylalcohol and toluene act as carriers. The solubility of amino acids to CH2Cl2. and Polyaniline is also introduced to examine the ability of 1-butlacohol and toluene as carriers. From an amino acid mixture containing GLy, LEu, ILe, VAl, CYs, PHe, HIs, ALa, GLn we successfully separated ALa, LEu, ILe, VAl. This result indicates that this optimized analytical condition obtained could be successfully applied to the qualitative analysis of the amino acids in human blood, urine, and other tissue samples using this liquid membrane system. .
梁在乾,홍재진 단국대학교 1994 論文集 Vol.28 No.-
The trimethylol phenol(TMP) is synthesized by means of Freeman's method. The mole fraction of reaction mixture was phenol : formaldehyde : sodium hydroxide(1 : 3 : 1), the reaction condetion was at 30℃ for 40 hours and the yield was 80%. The siloxane barium hydroxide(SB) was obtained from the reaction of siloxane sodium salt(S_3) and barium chloride in the isopropyl alcohol at 80℃ for 4 hours. The mixture of TMP and SB was acidified with acetic acid and heated at 110℃. After 30 min. heating, the reaction mixture was turned into soluble corsslinked resin. The heating was continued up to 130∼170℃ and than insoluble TMP/SB copolymer was obtained. Based on the analysis of TGA and DSC analizer, this copolymer has the higher thermal stability than that of phenol resin. The copolymer was identified by IR and elementary analysis. As the concentration of Si was incerased, the elongation property of resin was increased. By checking the tensile strength and the elongation properties we have plans to apply industrial use.
박정오 ( Chung Oh Park ),홍재진 ( Jae Jin Hong ) 대한임상검사과학회 2004 대한임상검사과학회지(KJCLS) Vol.36 No.2
A bulk liquid membrane system was introduced for selective separation of an amino acid mixture. We confirmed p-diamethylaminobenzaldehyde (DAB), sulfosalicylic acid (SSA) and 1-naphtol were very useful carriers for selective separation of an amino acid mixture. As a result, Ala, Leu, Val, Phe and Ile were successfully separated by SSA, 1-naphtol in basic condition, 1-naphtol in weak acidic condition, DAB in strong acidic condition and DAB in strong basic condition. The separation mechanism was proposed by ion pair mechanism in the case of SSA and 1-naphtol and Imine bond formation mechanism was also introduced for DAB.
Polyaniline, 1-Butylalcohol, Toluene을 함유하는 H₂O-CH₂Cl₂-H₂O Liquid Membrane을 이용한 아미노산의 선택적 분리
박정오 ( Chung Oh Park ),홍재진 ( Jae Jin Hong ) 대한임상검사과학회 2003 대한임상검사과학회지(KJCLS) Vol.35 No.1
This paper studies amino acid separation using a H₂O-CH₂Cl₂-H₂O liquid membrane system. A CH₂Cl₂ layer is modified and 1-butylalcohol and toluene act as carriers. The solubility of amino acids to CH₂Cl₂. and Polyaniline is also introduced to examine the ability of 1-butlacohol and toluene as carriers. From an amino acid mixture containing GLy, LEu, ILe, VAl, CYs, PHe, HIs, ALa, GLn we successfully separated ALa, LEu, ILe, VAl. This result indicates that this optimized analytical condition obtained could be successfully applied to the qualitative analysis of the amino acids in human blood, urine, and other tissue samples using this liquid membrane system.
박정오 ( Chung Oh Park ),홍재진 ( Jae Jin Hong ) 대한임상검사과학회 2008 대한임상검사과학회지(KJCLS) Vol.40 No.1
In classical titrimetric analyses, the major concern is the concentration of titrant, usually the aqueous solution of hydrochloric acid or sodium hydroxide, that could be changed as time goes by and it is accompanied with the inaccuracy of the resulting data. And the statistical approach, the nonlinear regression analysis, which is a well-known statistical method, was introduced to determine the accurate concentration of the titrant and the exact value of parameters, Ka, r, Ca, Cb, for 0.01 M aqueous solutions of analytes, sodium pyruvate, sodium acetate, sodium bicarbonate, ammonium hydroxide, ammonium chloride and acetic acid at 25℃. We used Gauss-Newton method for the linearlization of the nonlinear titration system and the two-parameter fitting showed appreciable convergent data for the parameters of the analytes set with the various range of Ka value.