According to AOCS CD 8b (Peroxide Value Acetic Acid-Isooctane Method); ISO (Animal and vegetable fats and oils. SAMPLING AND ANALYSIS OF COMMERCIAL FATS AND OILS AOCS Official Method Cd 8b Revised Peroxide Value Acetic. AOCS has standardized a method for. PV determination with chloroform (Cd. 8- 53) and with isooctane (Cd 8b). The latter method uses a mixture of acetic.
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Page 3 of 3. Proceed as directed in Procedure for Fats and Oils, paragraphs 1—4. The TLV is 10 ppm in air. This solution may be prepared by accurately pipetting mL of 0. Explosive limits in air are 1. If a blue color is formed that requires more than 1 drop of 0. This solution may be prepared by accurately pipetting mL of 0. Test the saturated KI solution by adding 2 drops of starch solution to acs. The highest tocochromanol and phytosterol content were observed in wheat germ and blackcurrant seed oil, and the lowest in black cumin and dill seed oil.
The substances are generally assumed to vd peroxides or other similar products of fat oxidation. The second group included oil from dill seeds, milk thistle seeds, parsley seeds, watermelon seeds, safflower, poppy seeds, black cumin seeds, hemp, blackcurrant seeds, borage, and wheat germ. Reproducibility—The difference between two test results on the same material, under the same conditions in different laboratories, should not exceed the reproducibility value, R.
AOCS CD 8b – 90 Peroxido – Free Download PDF
Burette—25 mL or 50 mL, class A, graduated in 0. The results are presented in ISO Weigh the test portion Table 1 into a mL Erlenmeyer flask with glass stopper and add 50 mL of the 3: The nutritional quality indexes were also calculated. Make certain the solution remains saturated during use, as indicated by the presence of undissolved KI crystals. Do not reheat for filtration unless absolutely necessary. Test the saturated KI solution by adding 2 drops of starch solution to 0.
Erlenmeyer flasks—with glass stoppers, mL. Allow to stand for 5 min and then add mL of distilled water. Please fill this form, we will try to respond as soon as possible.
Page 2 of 2. Avoid 8 with the skin. The test should be carried out in diffuse daylight or in artificial light shielded from a direct light source.
AOCS CD 8b – 90 Peroxido
Please copy and paste this aocz script to where you want to embed Embed Script. Add 1—2 mL of starch indicator and continue the titration, adding the thiosulfate solution slowly until the blue color just disappears.
Test for sensitivity—Place 5 mL of starch solution in mL of water and add 0. If the titration is less than 0. It is toxic 09 ingestion and inhalation.
The deep blue color produced must be discharged by 0. Swirl to dissolve the sample.
Fresh indicator must be prepared when the end point of the titration akcs blue to colorless fails to be sharp. Sodium thiosulfate solution, 0. Starch indicator solution—tested for sensitivity, prepared by making a paste with 1 g of starch see Notes, 1 and a small amount of cold distilled water.
It is nonflammable, but will burn on prolonged exposure to flame or high temperature. We are a non-profit group that run this website to share documents.
Proceed as directed in Procedure for Fats and Oils, paragraphs 1—4. This method is highly empirical, and any variation in the test procedure may result in erratic results. Plant oils are a good source of compounds that decrease the risk of some diseases. Based on collaborative study results References, 1,2the recommendation is to use 0. The test should be 8v out in diffuse daylight or in artificial light shielded from a direct light source References, socs.
Allow to stand for 5 min and then add mL of distilled water.
Burette—with 25 mL or 50 mL, class A, graduated in 0. Potassium dichromate cf toxic by ingestion and inhalation. It is toxic by inhalation and has anesthetic properties.
Add the thiosulfate solution dropwise until the blue color just disappears see Notes, 3 and 4. The acid value AVperoxide apcs PVoxidative stability, fatty acid composition, phytosterol content, and tocochromanol content were measured for both fresh and stored oils. The strength of the sodium thiosulfate solution is expressed in terms of its normality.
Acetic acid—chloroform solution 3: Rapid mechanical stirring e. Potassium iodide KI solution—saturated, prepared fresh each day analysis is performed by dissolving an cc of KI in recently boiled distilled water.