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Seed lipids of Persea americana and Chrysophyllum albidum were studied. Lipids were extracted with chloroform-methanol, analysed with silicic column chromatography and thin layer chromatography. The total lipid content of Persea americana was 10.8% while that of Chrysophyllum albidum was 7.7%. Fractionation of the total lipid fraction of Persea americana using silicic acid column chromatography showed the occurrence of neutral lipids 6.5%, glycolipids 2.1% and phospholipids 2.2% while those of Chrysophyllum albidum were 4.2%, 1.7% and 1.8% for neutral lipids, gycolipids and phospholipids, respectively. Thin layer chromatography separation showed three classes of lipids in Persea americana and Chrysophyllum albidum which were oleic acid, palmitic acid and cholesterol. The colour of these lipids was yellow and solid at room temperature. These studies suggest that oil extracted from seeds of Persea americana and Chrysophyllum albidum could be used for the manufacture of industrial products.

ABSTRACT:The physiology, physico-chemical conditions and distribution of phytoplankton in the Brass River, Nigeria has been assessed. The data on physico-chemical conditions revealed a near constant water surface conditions for all the stations sampled. The relative abundance of phytoplankton population of the Brass River system revealed the presence of the following marine phytoplankton families Bacillariophyceae (Bidulphia auria, M. mobiliencesis, B. sinsensis, Skeletonema costatum), Chlorophyceae(Halosphaera ividis), and Dinophyceae (Ceeratium sectum). @JASEM

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The fatty acids from seed lipids of Persea grattisima and Chrysophyllum albidum were studied inorder to identify, classify and to ascertain the suitability of these lipids for edible and industrial purposes. Lipids were extracted with chloroform-methanol (2:1) and quantified with Gas Liquid chromatography. Gas liquid chromatographic analyses of Persea grattisima and Chrysophyllum albidum seed lipid extracts indicated that cholesteryl heptadecanoate (C17.0), 1,3 dipalmitin 2-stearin (16.0, C18.0), triolein (C18.1), trilinolein (C18.2), trilinolenin (18.3), and tristearin (C18.0) were the major fatty acids present in Persea grattisima while cholesteryl myristate (C14.O), cholesteryl palmitate (C16.0), and triolein (C18.1) were the fatty acids present in Chrysophyllum albidum. These studies show that Persea grattisima and Chrysophyllum albidum have high oil content hence can be classified as oil seeds and the fatty-acids of seed lipids could be potential sources of industrial oil.