Isolasi Senyawa dari Fraksi Etil Asetat Rimpang Bengle (Zingiber cassumunar Roxb.)

Kurnianingsih , Mei (2001) Isolasi Senyawa dari Fraksi Etil Asetat Rimpang Bengle (Zingiber cassumunar Roxb.). Undergraduate thesis, FMIPA UNDIP.

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Abstract

Telah dilakukan isolasi terhadap senyawa dalam fraksi etil asetat rimpang bengle (Zingiber cassumunar Roxb.). Penapisan fitokimia terhadap rimpang bengle memberikan hasil yang positif terhadap golongan senyawa flavonoid, triterpen, dan tanin. Pemisahan dilakukan dengan kromatografi kolom vakum dengan eluen suatu seri pelarut berdasar gradien kepolaran yang meningkat dari n-heksan ---> etil asetat—> metanol. Fraksi I — VI yang mengandung senyawa mayor diisolasi lebih lanjut dengan kromatografi lapis tipis preparatif dan didapat noda merah dengan harga Rf 0,19. Analisis terhadap senyawa basil isolasi dilakukan dengan metode spektroskopi ultra violet-visible dan GC-MS. Hasilnya adalah adanya serapan pada panjang gelombang 262, 272, dan 304 nm yang menunjukkan adanya transisi elektronik dari n n*, dan .rc n*. Sedangkan analisis dengan GC-MS menunjukkan adanya dua komponen dalam senyawa hasil isolasi, di mans puncak I adalah suatu alkena atau keton alifatik, dan puncak II adalah suatu ester atau eter aromatik yang diduga termasuk golongan terpenoid atau fenolik. Isolation of the compounds in ethyl acetat fraction has been done to research the chemical compound of the semipolar fraction of bengle rhizome (Zingiber cassumunar Roxb.). Phytochemical screening of bengle rhizome gives the positive result on the compound groups of flavonoid, quinon, triterpen, and tanin. Separation was done by using vacuum chromatographic column and the eluen was a seri of solvent based on the polarity gradien that increased from n-hexane —> ethyl acetat -+ methanol. Fraction I — VI that contained major compound then isolated further by preparative TLC method and compound with the Rf value 0.19 was found. The analyses of the compound have been done by the UV-Vis and GC-MS spectroscopic methods. The results were absorptions on the 262, 272, and 304 nm wave length, that showed the electronic transition from n —> it*, and it -› n*. While, by using the GC-MS method showed the existance of two compounds in the isolated compound, where the peak I was an alkene or aliphatic ketone, and the peak Ti was an aromatic ester or ether; which both of them were predicted as the member of terpenoid or phenolic group.

Item Type:Thesis (Undergraduate)
Subjects:Q Science > QD Chemistry
Divisions:Faculty of Science and Mathematics > Department of Chemistry
ID Code:30812
Deposited By:Mr UPT Perpus 1
Deposited On:07 Nov 2011 13:36
Last Modified:07 Nov 2011 13:36

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