The presence of 9 antibiotics (SMX, STZ, SMZ, SMR, TRI, NOR, CIP, ENR, OFL) in water and sediment in the west and Truc Bach lake showed antibiotic concentrations in water samples ranging from below detection limit (BDL) to ng / L and samples from sediment samples from BDL to ng / g. | Vietnam Journal of Chemistry, International Edition, 54(4): 477-482, 2016 DOI: Furanosesterterpenes from the marine sponge Ircinia echinata (Keller, 1889) Do Thi Trang1, Duong Thi Dung1, Nguyen Xuan Nhiem1, Bui Huu Tai1, Pham Hai Yen1, Hoang Le Tuan Anh1, Pham Hai Yen1, Do Cong Thung2, Chau Van Minh1, Phan Van Kiem1* 1 Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST) 2 Institute of Marine Environment and Resources, VAST Received 24 March 2016; Accepted for publication 12 August 2016 Abstract Four furanosesterterpene, (7E,12E,20Z,18β)-variabilin (1), (12E,20Z,18β)-8-hydroxyvariabilin (2), (7E,11E,3β)3,7,11-trimethyl-14-(furan-3-yl)tetradec-7,11-dienoic acid (3), and furoscalarol (4), and one sterol, 3β-hydroxycholest5-en-7-one (5) were isolated from the methanol extract of the sponge Ircinia echinata (Keller, 1889). Their structures were elucidated by 1D and 2D-NMR spectra and in comparison with those reported in the literature. Keywords. Sponge, Ircinia echinata, furanosesterterpene, sterol. 1. INTRODUCTION Ircinia is a genus of marine demosponge in the family Irciniidae providing a number of furanosesterterpenoids and steroids. These compounds exhibited a wide spectrum of bioactivities such as anticancer [1-4], antimicrobial [5], and antiviral activities [6]. However, chemical and biological studies of Ircinia echinata have not been studied yet. In this paper, we report the isolation and structural determination of four furanosesterterpenes and one sterol from the Vietnamese sponge, I. echinata (figure 1). 2. MATERIAL AND METHODS . Animal material The sponge Ircinia echinata was collected at Coto Island, Quangninh, Vietnam in April, 2014. Its scientific name was identified by one of the authors, Prof. Do Cong Thung. A voucher specimen (HM04) was deposited at the Institute of Marine Biochemistry, VAST. . General experimental procedures Optical rotations were measured on a Jasco DIP370 .
