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Yu Jihn Kwon,So Young Chung,Eun Joo Koo,Ji Eun Park,Dong Hyuk Seo,Yo A Lee,Yu Young Jung,Hee Eun Min,Mi Ran Kim,Eungui Kang,Jeongyun Cho,Seong Soo Park,Sun Ok Choi,Chul Joo Lim 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Genetically modified (GM) papaya (Carica papaya L.) line 55-1 (55-1), which is resistant to papaya ringspot virus infection, has been marketed internationally. Many countries such as the European Union, Japan, and Korea have a mandatory safety assessment, approval and labeling regulations for GM foods. Thus, there is a need for specific methods for detecting 55-1. In this study, we established a real-time PCR detection method applicable to 55-1 for a variety of papaya products. The limit of detection was possible for fresh papaya fruit up to dilutions of 0.005% and 0.01% (weight per weight [w/w]) for homozygous SunUp and heterozygous Rainbow cultivars, respectively, in non-GM papaya. The 55-1 event-specific detection method observed parallelism (r2>0.99) between the concentration of line 55-1 cultivars and Ct values obtained in amplification plots at concentrations of 0.005-10% for SunUp DNA and 0.01-10% for Rainbow DNA. The method was applicable to the qualitative detection in various types of processed products (cocktail fruit, dried fruit, juice, etc.) containing papaya as a main ingredient. Monitoring papaya products for the presence of GM papaya were demonstrated using a P35S and T-nos real-time PCR detection method but no amplification signals were detected.
Alumina 담지 Molybdenum 계 촉매상에서 수소첨가 탈황특성 : 촉매상과 활성의 관계 Relation between Catalyst Phase and Activity
김경림,박해경,이진구 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
촉매상에 따른 탈황활성의 변화를 살펴보기 위하여 산화, 환원, 질화, 탄화, Mo, CoMo, NiMo/γ-Al₂O₃촉매상에서 dibenzothiophene 탈황활성을 비교분석하였다. 질소 흡작분석결과 제조방법에 따라 γ-Al₂O₃담체 자체의 기하학적인 특성이 변함을 알 수 있었다. 등온 고정층 연속흐름 반응기에서 dibenzothiophene 탈황실험을 하였다. 진화물 및 탄화물의 탈황활성은 비교적 안정되었으나, 산화물, 환원물, 황화물은 반응시간이 경과함에 따라 탈황활성이 저하되었다. 질화물의 경우 Mo/γ-Al₂O₃에 Co와 Ni를 첨가할 경우 활성억제효과를 가져왔으며, 질화물을 전조물로하여 제조한 탄화물은 Co와 Ni를 첨가였을 때 활성이 우수하였다. 환원물 촉매의 경우 CoMo, NiMo/γ-Al₂O₃ 촉매와 Mo/γ-Al₂O₃ 촉매는 반응변수(온도, 접촉시간)가 변화함에 다른 활성의 변화특성을 보였다. 탈황활성이 우수한 황화 CoMo/γ-Al₂O₃(CoO 3 wt%, MoO₃ 12wt%)와 질화 Mo/γ-Al₂O₃(MoO₃ 12wt%)는 반응변수의 변화에 따라 비슷한 활성과 선택도를 보였다. A number of alumina-supported molybdenum-based catalysts oxides, metals, sulfides, nitrides and carbides were prepared and investigated for the relation between catalyst phase and hydrodesulfurization activity. From the N₂ adsorption an analysis, it was established that the texture properties of γ-Al₂O₃ support were changed by the synthesis method. The hydrodesulfurization of dibenzothiophene over these catalysts was studied in an isothermal fixed-bed continuous-flow reactor. The activities of nitrides and carbides were not significantly changed but oxides, metals and sulfides lost their activities rapidly during the reaction. The addition of cobalt and nickel deteriorated the activities of nitrides but enhanced those of carbides. Among the metals the unpromoted molybdenum showed different reactivity against the promoted one with the variation of reaction parameters(temperature, contact time). Both sulfided CoMo/γ-Al₂O₃(CoO 3wt%, MoO₃ 12wt%) and nitrided Mo/γ-Al₂O₃(MoO₃12wt%) had shown similar activities and selectivities.
Catalytic oxidation of polycyclic aromatic hydrocarbons (PAHs) over SBA-15 supported metal catalysts
Seong-Ho Yoon,Joo-Il Park,Jihn-Koo Lee,Jin Miyawaki,Isao Mochida 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.2
Naphthalene was chosen as a model reactant of PAHs, and its catalytic destruction aimed to reduce the content of PAHs in diesel fuels was investigated over three different metal (Pt, Ru and Mo) catalysts supported on SBA-15 and g-alumina. The catalysts were characterized by N2-sorption isotherms, CO and NO chemisorptions, temperature programmed desorption of naphthalene and NH3, and 27Al MAS NMR. The SBA-15 supportedmetal catalysts showed a better activity at lower reaction temperature than the galumina supported ones, most probably due to higher metal dispersion and enhanced mesoaccessibility. Pt/SBA-15 catalyst exhibited the highest activity, corresponded to Ru or Mo/SBA-15catalyst, as reasoned by the temperature programmed desorption of naphthalene. The improved catalytic performances and thermal stability of catalysts could be achieved by incorporation of Al species into SBA-15. The characteristics of Pt states and complex on the surface of acidic supports could lead to the enhanced catalytic activity of naphthalene oxidation, as well as the limited sintering of Pt particles at high temperature, giving rise to thermal stability of catalysts.
Molybdenum Nitride 촉매상에서 Dibenzothiophene 의 추첨탈황반응에 관한 연구
김경림,박해경,이진구,김문찬 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.2
본 연구에서는 topotactic reaction을 통하여 제조한 Mo₂N 및 Mo₂N/γ-Al₂O₃촉매의 특성분석 실험을 행하였고, 이 촉매를 사용하여 고정층 연속흐름 반응기에서 n-decane에 0.5㏖% 함유된 dibenzothiophene의 수첨탈황 반응실험을 행하였다. 촉매제조시 승온속도를 느리게 하였을 때 결정성 및 비표면적이 증가하는 경향을 보였다. 또한 충전량이 적을수록 비표면적이 증가하였다. 질화물 촉매는 반응초기에 안정화된 후 일정한 탈황활성을 보였으며, 실험후에도 비표면적이 거의 변하지 않았다. 촉매의 산성도 및 탈황활성은 Mo₂N<MoO₃/γ-Al₂O₃<Mo₂-N/γ-Al₂O₃의 순서로 증가하였다. Cyclohexylbenzene이 biphenyl의 수소화반응에 의하여 생성되지 않고 병렬반응에 의해 각자 생성되는 것으로 유추할 수 있다. Mo₂N and Mo₂N/γ-Al₂₃O, catalysts were prepared by topotactic reaction method. The catalysts characterization and hydrodesulfurization of n-decane containing 0.5 ㏖% dibenzothiophene was studied in a fixed bed continuous flow reactor. The XRD and BET studies showed that the extent of the crystallinity and the surface area of the prepared Mo₂N catalysts increased when the temperature ramping rate was lowered and the packing weight was reduced. After stabilized in the incipient stage of the reaction the nitride catalysts showed constant hydrodesulfurization activity and the surface area showed very little change. The acidity and the hydrodesulfurization activity increased in the order of Mo₂N<MoO₃/γ-Al₂O₃<Mo₂N/γ-Al₂O₃. It was found that cyclohexylbenzene was not generated from the hydrogenation of biphenyl, but both cyclohexylbenezene and biphenyl were produced through parallel reaction.