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UV 및 젖산 처리에 의한 난각 표면의 Salmonella 억제 효과
손원근,이철현,강호조 한국수의공중보건학회 2002 예방수의학회지 Vol.26 No.4
The inhibitory effects were investigated of 254-nm ultraviolet (UV) radiation and lactic acid (LA) treatment on populations of Salmonella (S) enteritidis on eggshell surface. All UV exposures (730, 1,580, 3,000 W/cm²) for 30 sec significantly reduced S enteritidis (P 0.05). UV irradiation with 3,000 μW/cm² almost completely eliminated S enteritidis on inoculated eggshells by 99%. These results suggest that the higher intensity of UV irradiation may be associated with the higher germicidal activity. However, no significant differences were detected between UV exposure times. The treatments of LA at the concentration of 0.1, 0.3 and 0.5 % also specifically decreased the bacterial cell populations (0.91 1.14 log CFU) on the eggshell compared with the control (6.92 log CFU). The treatment of LA at the concentration of 0.5 % had the reaction of a 2.52 log unit storage for 9 days. The combined treatment of UV (3,000 μW/cm²) and LA(0.5%) decreased S enteritidis populations on eggshell by 3.85 log unit, compared wth the control (P 0.05), and its inhibitory effect was stronger with storage time.
손원근,김상헌,박수길,Son, Won Geun,Kim, Sang Heon,Park, Su Gil Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.1
Sulfonated poly(phenylene sulfide) (SPPS) polymers were prepared by sulfonation of poly[methyl[4-(phenylthio) phenyl]sulfonium trifluoromethanesulfonate] (PPST) with fumic sulfonic acid (10% $SO_3-H_2SO_4$) and demethylation with aqueous NaOH solution. The equilibrium constants of ion exchange reactions between alkali metal cations ($Li^+,\;Na^+,\;and\;K^+$) and SPPS ion exchanger in organic solvents such as tetrahydrofuran (THF) and dioxane were measured. The equilibrium constants of ion exchange reactions increased as the polarity of the solvent increased, and the reaction temperature decreased. The equilibrium constants of the ion exchange reaction ($K_{eq}$) also increased in the order of $Li^+,\;Na^+,\;and\;K^+$. To elucidate the spontaneity of the exchange reaction in organic solvents, the enthalpy, entropy, and Gibbs free energy were calculated. The enthalpy of reaction ranged from -0.88 to -1.33 kcal/mol, entropy ranged from 1.42 to 4.41 cal/Kmol, and Gibbs free energy ranged from -1.03 to -2.55 kcal/mol. Therefore, the exchange reactions were spontaneous because the Gibbs free energies were negative. The SPPS ion exchanger and alkali metal ion bounding each other produced good ion exchange capability in organic solvents.
The Characteristic Calulation of Carboxylic Ion Exchanger.
손원근,김태일,김상헌,박수길,정장훈,Son, Won Geun,Kim, Tae Il,Kim, Sang Heon,Park, Su Gil,Jeong, Jang Hun Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.6
A method for calculating the main characteristics of a potentiometric titration curve in a carboxylic ion exchanger has been investigated. The potentiometric titration curves of simple electrolyte and ion exchangers (polyelectrolytes) showed a great difference between them. The acidity parameters of the ion exchangers, the thermodynamic constant (pK0), apparent equilibrium constant (K), and correction for the apparent equilibrium constant (b), were introduced and used to express the characteristics of the carboxylic ion exchanger. A characteristic equation related to the acidity parameters of the ion exchangers systems was derived. A fibrous carboxylic cation exchanger was used and potentiometric titration curves at different concentrations of the supporting electrolyte were obtained . To prove the validity of the characteristic equation, the concentration of the supporting electroyte was varied. In the present study, good agreement between the data points and the fitted curves was found in all the cases. The g (number of moles of alkali to 1 g of ion exchanger) of carboxylic ion exchanger was calculated from the concentration of supporting electrolyte (C), pH of the solution, and degree of neutralization of ion exchanger (x).