The isolation and purification of the leaves extract of Alseodaphne corneri Kosterm yielded four alkaloids; norisocorydine 1, isocorydine 2, 2-norobamegine 3 and obamegine 4. This phytochemical study involves extraction, separation by using various chromatographic methods and structural determination by spectroscopic technique such as ultraviolet spectroscopy (UV), infrared spectroscopy (IR), nuclear magnetic resonance spectroscopy (NMR) including 1D-NMR (1H, 13C and DEPT), 2D-NMR (COSY, NOESY, HMQC/HSQC, and HMBC) and mass spectrometry (MS). The IC50 value of antiplasmodial activity for isocorydine 2 and obamegine 4 are 0.50 μmolL-1 and 0.14 μmolL-1 respectively...

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Hujan merupakan salah satu elemen penting dalam proses dan perubahan bentuk bumi. Penganalisisan terhadap data hujan akan dapat menentukan pelbagai impak yang berlaku di atas permukaan bumi seperti kadar luahan, aliran permukaan, air dalam tanah, hakisan tanih, meramalkan dan menetukan kejadian banjir. Trend jangka panjang dan juga intensiti sering dikaitkan sebagai penyumbang kepada peningkatan kadar hakisan permukaan di kawasan yang dibangunkan. Dalam penulisan ini, fokus diberikan kepada tindakan hujan terhadap masalah hakisan tanih yang berlaku di tapak kampus baharu UPSI yang sedang dibangunkan. Penelitian terhadap ciri hujan, pengaruh angin monsun, trend hujan jangkamasa panjang serta perkaitan hujan dengan kejadian hakisan dilakukan. Hasil kajian menunjukkan trend hujan jangkamasa panjang di Tanjong Malim adalah meningkat dan sentiasa melebihi 2400 mm setiap tahun. Kawasan kajian sedang dibangunkan terletak di kaki bukit dan Banjaran Titiwangsa sentiasa menerima hujan lebat deng.....

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A phytochemical study of the stem bark of Alseodaphne perakensis (Lauraceae) had been carried out. The dichloromethane crude extract from stem bark of Alseodaphne perakensis (Lauraceae) yielded two hernagine type of aporphine alkaloids namely oxohernagine and N-methylhernagine. The isolation and purification of these alkaloids were achieved using Column Chromatography (CC) and Preparative Thin Layer Chromatography (PTLC) techniques. The structural elucidations were performed by spectral methods notably Nuclear Magnetic Resonance (NMR) Spectroscopy one-dimentional (1H, 13C and DEPT) and two-dimentional (COSY, HMQC/HSQC and HMBC)...

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Murraya koenigii (Rutaceae), locally known as curry leaf tree, is a medicinally important herb of Indian origin and now is widely distributed throughout southern Asia. The bark of Malayan Murraya koenigii was investigated for phytochemical content. The isolation of chemical constituents from its hexane extract was carried out by using various chromatographic techniques. Spectroscopic methods, including NMR, IR, UV, MS spectra data, were used for the structural characterization. Four C23-carbazole alkaloids were isolated..

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A phytochemical study on the leaf extract of Alseodaphne corneri Kosterm involving extraction, separation by using various chromatographic methods and structural determination by spectroscopic technique such as ultraviolet spectra (UV), infrared spectra (IR), nuclear magnetic resonance (NMR) and mass spectra (MS) was carried out. The isolation and purification from the leaves of Alseodaphne corneri Kosterm yielded two aporphines: norlirioferine and lirioferine...

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The flavonoid compound, quarcetin-3-O-rutinoside (1) has been isolated from n-BuOH extract of the fresh of Sao Pedro Petro of Tubers of Cassava (Manihot esculenta Crantz). The chemical structure of compound (1) was identified by spectroscopic data including UV, IR, NMR (1H, 13C, DEPT 135°, HMQC, HMBC, 1H1H COSY) and MS and by comparing with previously reported spectral data.  ..

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[No abstract available]..

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In Malaysia, Alstonia spathulata Bl. is locally known as ‘Pulai Basong’ which distribute in peat forest. The separation of the chemical components from hexane and DCM crude extract of Alstonia spathulata was carried out using column chromatography (CC) and thin layer chromatography (TCL) techniques. A total of five known compound were isolated from the stem bark extracts and identified as: β-amyrin, β-amyrin acetate, lupeol acetate, stigmasterol and β-sitosterol. The elucidation structures of these compounds were established using 1D-NMR (1H, 13C and DEPT) and 2D-NMR (COSY, HSQC, HMBC) spectroscopic analysis, involving also comparison with data from the literature...

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