Chemical Composition antibacterial and antioxidant activity of the
essential oils of Amomum subulatum by using Microwave extraction
comparison with hydro distillation
Abstract
Microwave assisted hydrodistillation (MAHD) and conventional
hydrodistillation techniques were compared in the extraction of
essential oils from Amomum subulatum seeds. The time required for MAHD
method (70 min) is lesser than that for HD method (4 hr). There is a
slight increase in the yield of extracted oil in MAHD method (3.35%)
compared to HD (3%). GC-MS results show that MAHD extracted essential
oil was wealthier in oxygenated compounds. 1, 8-Cineole was found to be
a major compound in case of both the essential oil, followed by
α-pinene. In MAHD the percentage of the major oxygenated monoterpene (1,
8- cineol) slightly increases from 88% to 89% as compared to
hydrodistillation. Contrarily to this, the percentage of monoterpene
hydrocarbon were decreased in MAHD than HD extracted oil. MAHD and HD
extracted oils show good antibacterial activities against gram-negative
and gram-positive bacteria. MAHD extracted oil shows better
antibacterial activity than HD extracted against both gram positive and
gram-negative bacteria. 2, 2-diphenyl-1-picrylhydrazyl (DPPH•) radical
scavenging antioxidant activities show that MAHD extract has better
inhibition percentage than HD extract, and the IC50 value of MAHD was
less than HD extracted oil.