TAILIEUCHUNG - Highly oxygenated sterols from the starfish archaster typicus

Their structures were determined by the physicochemical and spectral data in comparison with the reported literature. This is the first report of these compounds from the Vietnamese starfish Archaster typicus. | Journal of Chemistry Vol. 45 3 P. 377 - 381 2007 HIGHLY OXYGENATED STEROLS FROM THE STARFISH ARCHASTER TYPICUS Received 15 August 2006 CHAU VAN MINH NGUYEN XUAN CUONG NGUYEN VAN THANH HOANG THANH HUONG PHAN VAN KIEM Institute of Natural Products Chemistry Vietnamese Academy of Science and Technology SUMMARY Three highly oxygenated sterols named ergost-22-ene-3f 4f 5a 6a 8f 14a 15a 25R 26-nonol . 27-norcholestane- 3f 4f 5a 6a 8f 14a 15a 24R-octol were isolated from the methanolic extract of the starfish Archaster typicus. Their structures were determined by the physicochemical and spectral data in comparison with the reported literature. This is the first report of these compounds from the Vietnamese starfish Archaster typicus. I - INTRODUCTION In recent years research in the marine sterol field has progressed at an impressive pace. Sterols are required compounds in all eukaryotes but the nature of sterols in a particular organism are varies considerably. The basic role of sterols is the maintenance of optimal fluidity of cell membranes although these compounds also serve as precursors for the production of diverse steroid classes such as the polyhydroxylated marine sterols. Echinoderms are rich sources of free sterols as well as their sulfates. In which sea cucumbers class Holothuridea and starfishes class Asteroidea produce stanols E and A7 and A9 sterols 1 . The first nonol 27-nor-5a-cholestan-3p 4p 5 6a 7p 8 14 15a 24a-nonol as well as its 6-sulphate and related polyols 13 from the starfish Archaster typicus are the most highly oxygenated sterols isolated to date. Later various chromatographies led to the isolation of sterols as cholest-24-ene-3 4 6 8 14 15 26-heptol-15-sulfate cholest-24-ene-3 6 8 14 15 26-hexol-15-sulfate cholest-24- ene-3 4 5 6 7 8 14 15 26-nonol-6-sulfate 2 ergost-22-ene-3 4 5 6 8 14 15 25 26-nonol 3 campest-22-ene-3 4 5 6 8 14 15 25-octol 3 27-norcholestane-3p 4p 5a 6a 7p 8p 14a 15a .

TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.