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Preliminarily Study on Methanolic Crude Extracts of Sonneratia sp. and
Antioxidant Activity
Sahira Afifah Binti Mohd Razipi
Supervisor: Dr. Noor Wini binti Mazlan
Bachelor of Science (Analytical and Environmental Chemistry)
School of Marine and Environmental Sciences
Universiti Malaysia Terengganu
The development of clean, non-toxic and eco-friendly methods are gaining importance
in exploring the bioactive compounds from the plant extracts. The main aim of this
study was to preliminarily screen the secondary metabolites from the leaves, fruits,
stems and twigs of Sonneratia sp. which have been collected at Setiu Wetlands,
Terengganu for its potential antioxidants activity. The extraction was done using cold
extraction to obtain methanolic crude extract. The highest methanolic crude extracts
were the leaves (18.43%) followed by the twigs (14.91%), fruits (14.72%) and stems
(11.32%) from Sonneratia sp. The secondary metabolites were identified by using ID
and 2D nuclear magnetic resonance (NMR) including COSY and HMBC coupled with
multivariate analysis (SIMCA P +14). The most potent antioxidant using DPPH
scavenging activity showed that the crude extract from the twigs of Sonneratia sp.
with inhibition concentration at 50% (IC50) value of 0.09 mg/mL.
1971 | UMT UNDERGRADUATE RESEARCH DAY 2018