Chemical Composition and Larvicidal Activity of Essential Oil from the Rhizomes of <i>Amomum rubidum</i> Growing in Vietnam
Lê Thi Huong, NGỌC-SÂM LÝ, Cao N. Giang, Đỗ Ngọc Đài, Isiaka A. Ogunwande
Abstract
This work reports the chemical constituents and larvicidal activity of essential oil from Amomum rubidum Lamxay & N. S. Lý. The essential oil was extracted from the air-dried rhizome in an all-glass Clevenger-type apparatus and characterized by gas chromatography (GC-FID) and gas chromatography/mass spectrometry (GC/MS) on HP-5 column. The larvicidal property was evaluated against the fourth-instar larvae of Aedes aegypti according to the protocols of the World Health Organization. A. rubidum essential oil was characterized by high amounts of β-phellandrene (16.1 %), limonene (14.4 %), and δ-3-carene (13.9 %). The oil displayed larvicidal activity against Ae. aegypti with minimum lethal concentration, LC50 values of 22.85 and 22.62 μg/mL respectively at 24 h and 48 h, while the LC50 values of 31.44 μg/mL and 31.03 μg/mL were obtained respectively at 24 h and 48 h. The chemical constituents and larvicidal actions of A. rubidum rhizome essential oils are being reported for the first time.