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Journal : Al-Kimia

Sintesis Heptapeptida Linear (H-Tyr-Asp-Pro-Ala-Pro-Pro-Pro-Oh) dengan Menggunakan Dic/Oksima sebagai Reagen Pengkopling Rani Maharani; Eka Fitri Yanti
Al-Kimia Vol 4 No 1 (2016): June
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (408.099 KB) | DOI: 10.24252/al-kimia.v4i1.1449

Abstract

A tetrapeptide, an analog of  trypsin-modulating oostatic factor (TMOF), has been synthesised by using a method of solid-phase peptide synthesis on 2-chlorotrityl chloride resin. Fmoc strategy was applied on the synthesis. The formation of peptide bond was facilitated by DIC/oxime as coupling reagent. After all of amino acids were attached on the resin, tetrapeptidyl resin was added by a mixture of TFA:water:EDT(90:5:5) in dichloromethane to cleave the peptide.Crude peptide was purified by reverse-phase column chromatography and the purified peptide was analysed by TOF ES-MS spectroscopy.
Steroid dari Kulit Batang Aglaia grandis (Meliaceae) Kindi Farabi; Nurlelasari Nurlelasari; Siti Hani Pratiwi; Desi Harneti; Rani Maharani; Agus Safari; Unang Supratman
Al-Kimia Vol 9 No 1 (2021): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v9i1.17936

Abstract

Steroids are a group of secondary metabolite which showed various biological activities. Meliaceae is a plant family used as a one of the source of steroid compounds. A. grandis is a member of the Meliaceae family in genus Aglaia which rarely explored. Previous studies have shown that A. grandis leaves contain triterpenoids, steroids, bisamide, and sesquiterpenoids. This study aims to obtain steroids from the bark of A. grandis. The structure of the isolated compound was determined using the NMR 1D and 2 D spectroscopic. Based on the extensive analysis, isolated compound identified as a stigmastant type steroid, stigmast-5-en-3β-ol-7-one.