03662ntm a2200373 i 4500 vtls000102835 KUKTEM 20251117113400.0 180123s2017 my a f am 000 0 eng d THE0000938(Local) 201905271032 nazirah 201802201239 saini 201801231138 saini UMP eng UMP rda FKKSA .L449 2017 r Bc. Lee, Yong Yong, author. Composition and biological activities of strobilanthes crispus leaves for essential oils extracted by hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD) methods / Lee Yong Yong Kuantan, Pahang : UMP, 2017 © 2017 xii, 55 pages : illustrations (some color) ; 30 cm. + 1 CD-ROM text rdacontent text rdacontent unmediated rdamedia computer rdamedia volume rdacarrier computer dics rdacarrier text file PDF rda Faculty of Chemical & Natural Resources Engineering Project Paper (Bachelor of Chemical Engineering) -- Universiti Malaysia Pahang – 2017 Includes bibliographical references and index Microwave-assisted hydrodistillation (MAHD), an advanced hydrodistillation (HD) method, in which a microwave oven is used to extract essential oil from medicinal plants. MAHD and HD methods have been compared and evaluated for their performance in the isolation of essentials oil from Strobilanthes Crispus leaves. The effect of microwave power, extraction time and water to raw material ratio were investigated to evaluate the best extraction conditions for obtaining maximum oil yield. As a result, the best condition that has been investigated for maximum essential oil production, 0.2016% (w/w) were 450W microwave power for 90 minutes at water to raw material ratio of 10:1. While, HD used 6 hours and water to raw material ratio of 10:1 to achieve the highest yield, 0.1886% (w/w). The composition of the extracted essential oils at different extraction time and microwave power was investigated by GC-MS to evaluate the quality of essential oil. Results shows that the constituent of essential oil from MAHD were different with essential oil from HD. The major constituent of S. Crispus oil from MAHD was Phthalic acid, bis(7-methyloctyl) ester and 1,2-Benzenedicarboxylic acid,mono(2-ethylhexyl)ester. However, the major compound of S. Crispus oil from HD were 1,2-Benzenedicarboxylic acid, decyl hexyl ester and 1,2-Benzenedicarboxylic acid,mono(2-ethylhexyl)ester. This indicates that the use of microwave irradiation influence the composition of essential oils. The maximum oil yield from S. Crispus were obtained at shorter extraction time period with significant influence on their chemical constituents. Therefore, for S. Crispus oil, the method of extraction depends on the uses of the oil. By reviewing the chemical constituents with other studies, Phthalic acid, bis(7-methyloctyl) ester has antimicrobial and antifouling activities whereas 1,2-Benzenedicarboxylic acid,mono(2-ethylhexyl)ester has anticancer activity. This may prove that MAHD can be used to extract large volume and high quality essential oil by using shorter time and saving energy. Faculty of Chemical & Natural Resources Engineering Dissertations Universities and Colleges Dissertations Theses 0 0 0 1 10000 10000 2019-09-04 0 FKKSA .L449 2017 r Bc. 0000122160 2019-09-04 00:00:00 1 2019-09-04 PSM 0 0 0 1 10000 10000 2019-09-04 0 CD 11160 | FKKSA .L449 2017 r Bc. 0000122161 2019-09-04 00:00:00 1 2019-09-04 PSM VIRTUA40 7712 7718 VTLSSORT0080*0200*0400*0900*1000*2450*2640*2641*3000*3360*3361*3370*3371*3380*3381*3470*5000*5020*5040*5200*6100*6500*6501*9992