Extraction of oil from local seed (groundnut seed) and characterization

Project Abstract

The extraction of oil from locally available seeds, such as groundnut seeds, holds significant importance due to the growing demand for edible oils. This research project focuses on the extraction of oil from groundnut seeds using different methods such as solvent extraction, cold pressing, and hot pressing. The extracted oils were then characterized to determine their quality parameters including fatty acid composition, iodine value, saponification value, and unsaponifiable matter. The results showed that the solvent extraction method yielded the highest oil extraction efficiency compared to cold and hot pressing methods. The characterization of the extracted oils revealed that groundnut oil is rich in unsaturated fatty acids, particularly oleic and linoleic acids, making it a healthy oil option. The iodine value indicated the degree of unsaturation of the oils, while the saponification value provided information on the average molecular weight of the oils. The unsaponifiable matter content reflected the presence of bioactive compounds in the oils. Overall, the findings from this research provide valuable insights into the extraction of oil from groundnut seeds and highlight the potential for utilizing local seeds as a sustainable source of edible oils with desirable nutritional qualities.

Project Overview

<p> </p><p><b>INTRODUCTION</b></p><p><b></b></p><b><p>Extraction other-wise called<br>leaching is the preferential solution of one or more constituents of a solid<br>mixture by contact with a liquid solvent. <br>This unit operation, one of the oldest in the chemical industries, here<br>been given many names, depending to some extent upon the technique used for<br>carrying it out extraction of oil form groundnut seeds can be carried out using<br>any of the two solid-liquid extraction methods namely: mechanical extraction<br>method or the used of solvent other- wise called mass-transfer method. The<br>yield of the second method is higher but contains more impurities than the<br>first method and it requires another unit operation (distillation) in purity it<br>better.</p><p>The success of an extraction and the technique to be used<br>will vary frequently depending upon any prior treatment which may be given to<br>he solid. In some instance small<br>particles of the soluble material are completely surrounded by a matrix of<br>insoluble matter. The solvent must then<br>diffuse into the mass, and the resulting solution must diffuse out before a<br>separation can result. Crushing and<br>grinding of such solids will greatly alliterate the leaching action, since then<br>the soluble portions are made more accessible to the solvent.</p><p>Seeds like groundnut seeds and other vegetable seeds are<br>cellular in structure, and the natural products to be leached form this<br>material are usually found inside the cells. if the cell walls remain intact<br>upon exposure to a suitable solvent, the leaching involves osmotic passage of<br>the solute through the cell walls. This<br>may be slow, but in is impractical and sometime undesirable to grind the<br>material small enough to release the contents of individual cells.</p><p>Oil constitutes a well-defined class of neutral organic<br>substance, which are essential constituents of all forms of plant and animal<br>life. They are soluble in other and<br>organic solvents but not in water. <br>Commercial oils are however from a relatively few member of the plant<br>and animal kingdom available forms. They are primary a product of agriculture<br>although these is also a considerably production from uncultivated tropical<br>plants and from mature animals. Oil can be grouped into edible and non-edible<br>depending on the amount of unspecified matters and impurities. Owing to the<br>fact that the use of oil from crop seed as a major raw materials has increased<br>in recent yeses their has been the need for extended and numerous research<br>works based on the extraction of these oil. <br>Form its seeds as economically efficiently as possible.</p><p>The only possible way of obtaining large quality of oil<br>from oil being vegetable or plant materials is by extraction and this could<br>best be achieve using leading process. This process can be accomplished by a<br>variety of ways but as might be expected its efficiency depends to an extant an<br>obtaining intimate contact between the liquid solvent and the solid containing<br>he solute. Leaching reduces the oil<br>content in the residue to about 0.5-1.5 percent as compared.</p><p>With about 5-9 percent by mechanical process. The types of<br>solvent available for leaching include 17-hexane, petroleum ether benzene ethyl<br>ether etc which are high petroleum fractions. <br>The choice of a solvent for extraction is a function of its volatility<br>and relative volatility for easy separation by distillation.</p><p>Groundnut oil is used primary in homes for cooking and<br>also as an industrial raw material for other usefully products.</p><p><b>1.2 &nbsp; &nbsp; SCOPE<br>AIMS/ OBJECTIVES FO THE PROJECT</b></p><p>The scope of this research project is to extract oil from<br>groundnut seeds and compare the yields obtained using different solvents and to<br>standard.</p><p>Also the project is aimed at characterizing the extracted<br>oil by determining the physical and chemical properties of the oil.</p></b> <br><p></p>