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양미희,유지현,김청식,신애선,강대희,장성훈,박수경,신해림,유근영,Yang, Mi-Hi,Yoo, Ji-Hyun,Kim, Cheong-Sik,Shin, Ae-Sun,Kang, Dae-Hee,Chang, Soung-Hoon,Park, Sue-Kyung,Shin, Hai-Rim,Yoo, Keun-Young 대한예방의학회 2003 예방의학회지 Vol.36 No.4
Objectives : Peripheral blood-buffy coat fractions (N=14,956) have been stored at $-70^{\circ}C$ in the headquarter of the Korean Multicenter Cancer Cohort (KMCC), since 1993. To study the future molecular etiology of cancers using specimens of the cohort, properly stored specimens are necessary, Therefore, the DNA-viability of the bully coat samples was investigated. Methods : Buffy coat fraction samples were randomly selected from various collection areas and years (N=100). The DNA viability was evaluate from the UV-absorbent ratios at 260/280nm and the PCH for $\beta$-globin was performed with genomic DNA isolated from the buffy coat. Results : PCR products were obtained from 85 and 98% of the C and H area-samples, respectively, using 50 or $100{\mu}l$ of the buffy coat. There were significant differences in the yields of the PCR-amplifications from the C and H areas (p<0.05), which was due to differences in the homogenization of the buffy coat fractions available as aliquots. The PCR-products were obtained from all of the samples (N=7) stored at the C area-local confer, but the other aliquots stored at the headquarter were not PCR-amplified, Therefore, the PCR products in almost all the samples, even including the DNA-degraded samples, were obtained. In addition, an improvement in the DNA isolation, i,e. approx. 1.6 fold, was found after using extra RBC lysis buffer. Conclusions : PCR products for $\beta$-globin were obtained from nearly all of the samples. The regional differences in the PCR amplifications were thought to have originated from the different sample-preparation and homogenization performance. Therefore, the long term-stored buffy coat species at the KMCC can be used for future molecular studies.
먹는물 중 Formaldehyde 분석방법 비교 및 적용성 평가
이연희 ( Youn Hee Lee ),박주현 ( Ju Hyun Park ),양미희 ( Mi Hee Yang ),권오상 ( Oh Sang Kwon ),정현미 ( Hyen Mi Chung ),허유정 ( Yu Jeong Huh ) 한국환경분석학회 2014 환경분석과 독성보건 Vol.17 No.1
In this study, the Korean standard method for unregulated drinking water containments was compared with internationally accredited standard methods. As a result of comparing various derivatization conditions, it was found that the derivatization time could be shortened from 2 hours to 30 minutes and that the reaction temperature could be decreased from 35±2oC to the room temperature. Formaldehyde (FA) derivatives (FA-PFBHA, FA-DNPH) were determined by GC/ECD, GC-MS and UV/VIS. The PFBHA-UV/VIS method was suggested as a substitute of the DNPH-UV/VIS approach. Blank samples were controlled more easily by the application of the PFBHA-UV/VIS method than of the DNPH-UV/VIS. In order to compare FA-DNPH and FA-PFBHA derivatization methods using HPLC/UV, bottled water was employed to assess the applicability to real samples. The assessment found that the correlation coefficients of the two methods were above 0.9. The use of spectrophotometer was considered another approach to determining FA in aqueous solution. Yellow FA compounds were determined while ammonium salt was contained in the same solution. An automated spectrophotometric analyzer was also tested. The result showed that this approach was highly applicable.
국내유통 먹는샘물 중의 안티몬 함량 및 용기 이행 특성
허유정 ( Yu Jeong Huh ),양미희 ( Mi Hee Yang ),조양석 ( Yang Seok Cho ),안경희 ( Kyung Hee Ahn ),이연희 ( Youn Hee Lee ),정현미 ( Hyun Mee Chung ),권오상 ( Oh Sang Kwon ),박주현 ( Ju Hyun Park ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.2
The knowledge on the migration of antimony (Sb) from PET bottles into the water is of greate concern. Antimony in all bottled water marketed in korea and in raw water was analyzed. The detection rate of antimony in total bottled water was 88 % and 100% in PET (Polyethylene terephthalate, PET), 55% in PC (Polycarbonate, PC) bottled water. 55% of raw water contained antimony. The average concentration of Sb in PET bottled water was 0.39 μg/L, higher than PC bottles (0.20 μg/L) and the raw water (0.22 μg/L). The migration of Sb into water that is stored in different conditions (room temperature, 45℃, and direct sunlight exposure) was investigated for 180 days. The migration tendency increased with the storage time and temperature. PET bottles showed a sharp increase of Sb concentration at 45℃, but there was no differences between the room temperature and sunlight exposure. The Sb migration in all simulated solution(deionized water, 4% acetic acid, and 20% ethanol) also increased with storage time and temperature. The Sb migration values ranged from 0.35 to 0.49 μg/L in all simulated solution, which was far below the permissible korean migration level of 40 μg/L. There was a tendency that the number of re-use of a bottle and the amount of leaching were in inverse proportion.