Abstract
The influence of microwave power (W), irradiation time (h) and particle size (P) on the yield of extraction and composition of essential oil from Illicium verum Hook.f has been assessed by means of a new experimental design. The combined effects of three factors above on the yield of extraction of essential oil Y% (r.m) have been determined using Doehlert matrices in the range of 100 - 400 W for microwave power, 10 - 40 mins for irradiation time and 0.4 - 2.0 mm for particle size. In these conditions, second order polynomial relationship between Y% (r.m) and these factors have been established with regression coefficients close to 0.93. The major effect of microwave power and particle size on the yield of extraction of essential oil has been highlighted. In the conditions of 325 W microwave power, 20 min irradiation time and 0.4 mm particle sizes, the highest essential oil yield by microwave assisted Soxhlet extraction was 8.3%. The main compound of Illicium verum Hook.f was the (E)-anethole (92 %). The composition of α-pinene, β-mycrene, α-phellandren were absent from the essential oil extracted from Illicium verum Hook. f. by use of MASE.
Highlights
Star anise (Illicium verum Hook. f.) fruits is referred to as aromatic evergreen tree
The essential oil extracted from Star anise fruits is applied as aroma in cookies, biscuits and in treating colic and rheumatism (Claus and Tyler, 1965)
The results showed that particle size sharply effects on the yield
Summary
Star anise (Illicium verum Hook. f.) fruits is referred to as aromatic evergreen tree. F.) fruits is referred to as aromatic evergreen tree This plant is one of the most important essential-oil trees grown in Northern Vietnam It is often used as a flavor in Vietnamese cuisine (Nguyen et al, 2012; Dang and Ilangantileke, 1997; Loi and Thu, 1970) and an element of the traditional spice powder of Chinese cooking. The essential oil from this fruits is used for treatment of stomachaches and rheumatism
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