Now or Never

2009 년도 분리정제론 발표자료

In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom: C=O. The term carbonyl can also refer to carbon monoxide as a ligand in an inorganic or organometallic complex (a metal carbonyl, e.g. nickel carbonyl); in this situation, carbon is triple-bonded to oxygen: C≡O. Note that the most specific labels are usually employed. For examp..

2D HMBC (Heteronuclear Multiple Bond Correlation) experiment correlates chemical shifts of two types of nuclei separated from each other with two or more chemical bonds. This is an improvement of the old COLOC experiment. For example 1H,13C-HMBC correlates chemical shifts of protons with carbons separated with two or three bonds, in some cases even with the more distant ones. The zero and double..

Preparative isolation and purification of antioxidative stilbene oligomers from Vitis chunganeniss using high-speed counter-current chromatography in stepwise elution mode Journal of separation science April 30 2009

An efficient combination of supercritical fluid extraction and high speed counter-current chromatograpgy to extract and purity homoisoflavonoids from Ophiopogon japonicus(thunb.) Ker-Gawler Journal of separation science

그냥 올려봅니다. 실험실앞 복도. 쪼맨이 ㅋㅋ CCC 학회용 사진. 실험실 옆 구름다리. 난방기 공사로 급히 이사ㅎ 생일이 같은 아랑 란주 ( 벌써 1년 --;) 음.. 이건 언제지? 동기모임 2010 7월..

용량은 작지만 소량 scale로 빠른시간내에 분리를 수행할수 있는게 가장 큰 장점이다. 요새 inner-line의 접합 불량과 빈번한 파손으로 인해 적잖이 골머리를 앓았다. 증상은 ... 1. flow를 조금만 높히면 압력이 크게 높아진다 300->400,500 2. 내부 용매를 N2로 밀어주면 예전과 다른 stream형태가 아닌 droplet으로 나온다. 3. 자주 접합 라인의 빠짐과 파손이 일어난다. 오늘 semi-prep , prep용 washing step을 그대로 밟아서 washing해보았는데 N2 stream처리시 droplet으로 나오던 녀석이 제법 잘 나오고 있다... 개인적으로 washing은 처음 해보는거라 아마 최근 2년간 ( 내가 온 이후) 한번도 안한듯하다...

Compare Alpha and Beta Glucose in the Chair Structures: The position of the -OH group on the anomeric carbon (#1) is an important distinction for carbohydrate chemistry. The Beta position is defined as the -OH being on the same side of the ring as the C # 6. In the chair structure this results in a horizontal projection. The Alpha position is defined as the -OH being on the opposite side of the ..

Review Strategies of solvent system selection for the isolation of flavonoids by counter current chromatography. J.Sep. Sci 2010 33 336-347

첫 해 1년가까이 노다가 한게 헛일은 아니었나 보다. 감사합니다. 제1저자를 향해 go.