Duration: 01/01/2012 - 31/12/2015
Contact: Dr. Nguyen Khac Bat; nkbat@rimf.org.vn
Content
1. Overall objectives: - Evaluating the marine sponge resources in key island areas. - Evaluating the ability to extract biologically active substances in sponges. 2. Goals: - Determining the composition of sponge species commonly found in the coastal waters of Vietnam's islands - Acquiring the characteristics of distribution and fluctuations of marine resources in key coastal waters. - Identifying sponges containing high biological activity. - Extracting and evaluating some new bioactive substances from sponges to Vietnam. 3. Tasks Task 1: Collecting, synthesizing and analyzing research results nationally and internationally related to the classification, resources, biological activities from sponges to select locations, orient research study. Task 2: Surveying, determining the composition of sponge species in the waters of Vietnam Task 3: Evaluating of the reserves and distribution characteristics of sponges in key islands Task 4: Developing a technological process to extract biologically active substances in sponges (2 processes, 2 products with antioxidant activity and products with antibacterial activity)
Output
A total of 257 species of sponges belonging to 3 classes, 21 orders, 55 families, and 102 genera were found distributed in the coastal waters of Co To, Ba Mun, Con Co, Tho Chu, Phu Quy and Phu Quoc islands. 90 species were added on the list of sponges in Vietnam. The total reserve of sponges in the coastal waters of 07 islands, to a depth of 25 m, was about 27,365 tons. All the sponge species selected for the test were able to extract antioxidant activity in which species Hyrtios erecta, Ecionemia acervus, Ircinia mutans, Spongia sp. has the most potential to extract antioxidant activity among the studied species. Especially species Ircinia mutans, Spongia sp. has the highest DPPH free radical scavenging activity, the highest antioxidant activity extraction capacity. Sponges with potential to extract antibacterial activity including X. testudinaria, Hyrtios erecta, Ecionemia acervus, Ircinia mutans, Haliclona sp., Spongia sp. and Spheciospongia sp.. in which, two species of X. testudinaria and Ircinia mutans have good resistance to both gram-negative and gram-positive bacteria.