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명정은 ( Jyong Eun Myung ),황인경 ( In Kyung Hwang ) 한국콩연구회 2008 韓國콩硏究會誌 Vol.25 No.1
The functional components of total polyphenols, flavonoids, isoflavones, and anthocyanins in soybean ethanol extracts were examined. Total polyphenol and flavonoids were in ranges of 2.63~5.54mg/g and 0.71~2.29mg/g, respectively. Daidzein and genistein contents were ranges of from 296.7 to 909.7 ug/g. Sinpaldal #2 was the highest while Chungjakong contained the lowest amounts. Anthocyanin contents of black soybeans were examined by pH differential method. The range of total anthocyanins was 1.76~2.24mg/g, and was not significantly different (p<0.05). DPPH and ABTS radical scavenging activities were measured to compare antioxidant activities of soybean extracts. Black soybeans were higher than yellow soybeans, maybe due to high level of anthocyanins in black soybean coat.
연구보문 : 수질환경 ; 고성능액체크로마토그래피-유도결합플라즈마 질량분석기를 이용한 어류 중 메틸수은 분석법 확립
유경열 ( Kyung Yoal Yoo ),반경녀 ( Kyeong Nyeo Bahn ),김은정 ( Eun Jung Kim ),김양선 ( Yang Sun Kim ),명정은 ( Jyong Eun Myung ),윤혜성 ( Hae Seong Yoon ),김미혜 ( Mee Hye Kim ) 한국환경농학회 2011 한국환경농학회지 Vol.30 No.3
BACKGROUND: Methylmercury is analyzed by HPLC-ICP/MS because of the simplicity for sample preparation and interference. However, most of the pre-treatment methods for methylmercury need a further pH adjustment of the extracted solution and removal of organic matter for HPLC. The purpose of this study was to establish a rapid and accurate analytical method for determination of methylmercury in fish by using HPLC-ICP/MS. METHOD AND RESULTS: We conducted an experiment for pre-treatment and instrument conditions and analytical method verification. Pre-treatment condition was established with aqueous 1% L-cysteine·HCl and heated at 60℃ in microwave for 20 min. Methylmercury in 50 μL of filtered extract was separated by a C18 column and aqueous 0.1% L-cysteine·HCl + 0.1% L-cysteine mobile phase at 25℃. The presence of cysteine in mobile phase and sample solution was essential to eliminate adsorption, peak tailing and memory effect problems. Correlation coefficient(r2) for the linearity was 0.9998. The limits of detection and quantitation for this method were 0.15 and 0.45 μg/kg respectively. CONCLUSION: Result for analytical method verification, accuracy and repeatability of the analytes were in good agreement with the certified reference materials values of methylmercury at a 95% confidence level. The advantage of the established method is that the extracted solution can be directly injected into the HPLC column without additional processes and the memory effect of mercury in the ICP-MS can be eliminated.