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TRANSFORMATION OF ETHYL-P-METHOXYCINNAMATE TO P –METHOXYCINNAMIC ACID FROM KENCUR (Kaempheria galanga L.) AND THEIR ANTIBACTERIAL ACTIVITY Fareza, Muhamad Salman; Rehana, Rehana; Nuryanti, Nuryanti; Mujahidin, Didin
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 2 (2017): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

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Abstract

This study aimed to evaluate the antibacterial properties of ethyl-p-methoxycinnamate and p-methoxycinnamate acid from Kaempheria galanga L. Ethyl-p-methoxycinnamate was isolated from the n-hexane rhizome extract of Kaempheria galanga L. Separation and purification of this compound was carried out with vacuum liquid chromatography and column chromatography. Hydrolysis of ethyl-p-methoxycinnamic under alkaline conditions obtained p-methoxycinnamic acid with a good yield of 85 %. The structure of the compounds were charactrized with IR, NMR spectrophotometer (1H-NMR and 13C-NMR) and mass spectrophotometer. The antibacterial properties of the compounds were evaluated using microdilution methods against B. cereus ATCC 11778, L. monocytogenes ATCC 7644, E. coli ATCC 25922, S. enterica sv Typhimurium ATCC 14028, and E. aerogenes ATCC 13048. The compounds showed weak antibacterial properties. Only ethyl p-methoxycinnamate showed the strongest antibacterial activity, especially against B. cereus ATCC 11778 bacteria with MIC values of 62.5 mg /mL. The change of the functional groups provided no significant impact on the antibacterial activity.
Isolasi dan Karakterisasi Senyawa Non Fenolik dari Daun Gowok (Syzygium polycephalum Miq.) Choironi, Nur Amalia; Insani, Kaefiyah Nurul; Parika, Dina; Sunarto, Sunarto; Martinus, Ade; Fareza, Muhamad Salman
Media Pharmaceutica Indonesiana (MPI) Vol 2 No 3 (2019): JUNE
Publisher : Fakultas Farmasi, Universitas Surabaya

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Abstract

Syzygium polychepalum (gowok) merupakan salah satu tanaman yang sering digunakan sebagai obat tradisional di Indonesia. Penelitian ini bertujuan untuk melakukan kajian fitokimia terhadap daun gowok yang berasal dari Purwokerto. Ekstraksi dilakukan dengan cara maserasi, sedangkan fraksinasi dan pemurnian dilakukan dengan metode kromatografi vakum cair dan gravitasi. Karakterisasi senyawa hasil isolasi dilakukan dengan menggunakan metode spektroskopi 1H-NMR dan GC-MS. Hasil karakterisasi menunjukkan bahwa isolat merupakan senyawa asam lemak jenuh yaitu asam heksadekanoat dan 3-etilpropanoat.