Institute of Applied Science


MSc: Pritesh Prasad

Mr. Pritesh Sharma


 Degree: Master of Science in Chemistry

 Researcher: Mr. Pritesh Prasad

 Thesis TitleIsolation and characterization of bioactive components of the marine sponge, Theonella

Principal Supervisor: Prof. William Aalbersberg

Status: Completed

Thesis Abstract:


My research project aims at finding bioactive compounds from a marine sponge, family Halichondriidae. This involves extraction/isolation, purification and structure elucidation of the bioactive compound(s).

The extraction procedure employs liquid-liquid partitioning of the crude extract in order to obtain Hexane, Dichloromethane, Butan-2-ol and Methanol fractions. Further fractionation carried out by flash column chromatography follows bioassay (bioassay guided fractionation). The bioassay involves tests against Vancomycin-resistant Enterococcus faecium (VREF), Methicillin-resistant Staphylococcus aureus (MRSA), wild type Staphylococcus aureus (WTSA), Wild-type Candida albicans (WTCA) and Amphotericin B- resistant Candida albicans (ARCA). Brine Shrimp assay (general cytotoxicity) is also carried out for the crude and fractions. The bioactive extracts are further subjected to semi-preparative High Performance Liquid Chromatography (HPLC) for purifications followed by spectroscopic techniques (LC-MS, NMR) for structure elucidation.

In addition to the research project, I am also involved in the research carried out in collaboration with other universities and Research institutions.







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Page updated: Monday, July 24, 2017
Institute of Applied Science
Faculty of Science and Technology
Private Bag, Laucala Campus,
Suva, Fiji.
Tel: (+679) 323 2965
Fax: (+679) 323 1534