determination of saponification value of fats and oils pdf

Determination Of Saponification Value Of Fats And Oils Pdf

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Saponification value or saponification number SV or SN represents the number of milligrams of potassium hydroxide KOH required to saponify one gram of fat under the conditions specified. The higher the saponification value, the lower the fatty acids average length, the lighter the mean molecular weight of triglycerides and vice-versa. Practically, fats or oils with high saponification value such as coconut and palm oil are more suitable for soap making.

Animal and vegetable Oils, Fats and Waxes: PART IV. Testing

Triacylglycerols are composed of three fatty acids each in ester linkage with a single glycerol. Since the polar hydroxyls of glycerol and the polar carboxylates of the fatty acids are bound in ester linkages, triacyl glycerols are non polar, hydrophobic molecules, which are insoluble in water. Saponification is the hydrolysis of fats or oils under basic conditions to afford glycerol and the salt of the corresponding fatty acid. Saponification literally means "soap making". The amount of free fatty acid is estimated by determining the quantity of alkali that must be added to the fat to render it neutral. This is done by warming a known amount of the fat with strong aqueous caustic soda solution, which converts the free fatty acid into soap. This soap is then removed and the amount of fat remaining is then determined.

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The present study aimed at characterizing the oil extracted from Bertholletia excelsa H. Analytical methods used for oils and fats were employed through pharmacopoeia assays, AOCS American Oil Chemists Society standard methods as well as those recommended by ANVISA National Health Surveillance Agency such as acidity, peroxide value, saponification index, iodine value and refractive index, pH and relative density, and also thermoanalytical analyses thermogravimetry, differential thermogravimetry and differential thermal analysis as well as chromatographic analysis gas chromatography. The characterization assessments of B. The termoanalytical tests indicated that B. In recent years, there has been a growing trend of using raw materials of natural origin in pharmaceuticals and cosmetics. This has caused the race to oils extracted from Amazon native plants, causing a rapid and significant expansion of the domestic and international market of these products.

Determination of saponification value of the given oil/fat.

Previous articles in this series appeared in our April, May and July issues and covered General Composition and Classification, Identification, and Testing respectively. This series will be enlarged to include more detailed information and will shortly be published in booklet form. Testing", Industrial Lubrication and Tribology , Vol. Report bugs here. Please share your general feedback.

In practice a known amount of the oil or fat is refluxed with excess amount of standard alcoholic potash solution and the unused alkali is titrated against a standard acid. Reaction :. Reflux and condenser. Water bath. Burette and Pipette. About 2 g of the given oil or fat is taken in a conical flask but weighed accurately w g. Then the reaction mixture is refluxed using a water condenser on a water-bath for half an hour.

Procedure:

Acid value of 11 samples was determined. The relative standard deviation of acid value for 5 replicates of each sample was less than 2. The method is superior to conventional titration methods in sensitivity and overcomes inaccuracy due to vagueness in color change of acidbase indicators in organic solvents. Most users should sign in with their email address.

In an actual laboratory setting, there are certain important steps that are not necessarily applicable in a virtual lab. Cite this Simulator:.

Saponification value

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Saponification value

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3 Comments

  1. Danny V.

    Dilini N.

    01.12.2020 at 11:08 Reply
  2. Angela S.

    Saponification value is expressed by potassium hydroxide in mg required to saponify one (1) gram of fat. It depends on the kind of fatty acid contained in the fat. Measurement of saponification value is performed according to the below listed official test methods. Here we test a sample of fatty acid.

    02.12.2020 at 09:26 Reply
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