ANTIOXIDANT ACTIVITIES FROM VARIOUS EXTRACTS OF DIFFERENT PARTS OF KELAKAI (STENOCHLAENA PALUSTRIS) GROWN IN CENTRAL KALIMANTAN - INDONESIA
Objectives: The aims of this research were to determine antioxidant activity from various extracts of different parts of kelakai (Stenochlaena palustris
[Burm.f.] Bedd) using two antioxidant testing methods, which were 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antioxidant power
(FRAP), and correlation of total phenolic contents (TPC), total flavonoid contents (TFC), and total carotenoid contents (TCC) with their inhibitory
concentration 50% (IC
) of DPPH and exhibitory concentration 50% (EC
) of FRAP.
Methods: Sample was extracted by reflux using different polarity solvents. The extracts were evaporated using vacuum rotary evaporator. Antioxidant
activities were tested using DPPH and FRAP assays, determination of TPC, TFC, and TCC was carried out by ultraviolet-visible spectrophotometry, and
correlation with their IC
of DPPH and EC
of FRAP capacities was analyzed by Pearsonâ€™s method.
Results: Ethanolic root extract of kelakai (S. palustris) had the lowest IC
of DPPH scavenging activity 0.8 Âµg/ml and the lowest EC
of FRAP capacity
5.4 Âµg/ml. Ethanolic kelakai root extract demonstrated the highest phenolic content, ethyl acetate young leaves extract had the highest flavonoid
content, and the highest carotenoid content was given by n-hexane root extract. There was significantly negative correlation between TPC in root
extract of kelakai with their IC
of DPPH and EC
Conclusions: All different extracts of kelakai parts were categorized as very strong antioxidants by DPPH method. Phenolic compounds in kelakai
root extract were the major contributor in antioxidant activities by DPPH and FRAP methods. DPPH and FRAP showed linear results in antioxidant
activities of root kelakai extract.
Keywords: Antioxidant, 2,2-diphenyl-1-picrylhydrazyl, Ferric reducing antioxidant power, Stenochlaena palustris, Young leaves, Old leaves, Root.
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