The present study describes chemical composition, antifungal activities, antioxidant assays and total phenolic content of essential oil and different extracts from leaves of Alpinia malaccensis. Sixty-eight components were identified by gas chromatography and gas chromatography–mass spectrometry with camphor (15.2%) and eucalyptol (10.2%) as the main component. The essential oil was found to possess remarkable fungicidal action against tested pathogens like Colletotricum falcatum, Rhizoctonia solani, Sclerotinia sclerotium and Sclerotium rolfsii followed by different extracts obtained in solvents like methanol, dichloromethane and hexane, respectively. The essential oil showed higher phenolic contents (69.51 μg/ml) than the extracts. The antioxidant assay of essential oil and extracts by different methods revealed good-to-moderate antioxidant potential with different IC50 values viz. (174.16–230.01 μg/ml) for Fe3+ reducing power, (111.74–158.23 μg/ml) for Fe2+ metal-chelating ability, (82.64–96.66 μg/ml) for DPPH, (94.28–189.41 μg/ml) for OH radical, (76.96–135.63 μg/ml), for NO radical and (107.30–199.75 μg/ml) in superoxide anion scavenging activities, respectively, compared to the standard antioxidants. Based on obtained results, the herb A. malaccensis can be a good source to develop a safe and sustainable natural antioxidant.
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Sethi et al. (2016) studied this question.
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