This method, adopted from ISO 10519 (References, 1), defines the chlorophyll content as the total of the substances contributing to the absorption band near 665 nm as determined under the operating conditions specified in this method, measured as chlorophyll and expressed in milligrams per kilogram (mg/kg) of the product as received.
AOCS stands for American Oil Chemists' Society. AOCS standards are internationally recognized guidelines for testing and analyzing fats, oils, and lipid-containing products. These standards cover a wide range of methods for measuring the physical and chemical properties of lipids, including methods for determining the fatty acid composition, iodine value, oxidative stability, and other characteristics of fats and oils. AOCS standards are used by researchers, manufacturers, and government agencies around the world to ensure the quality and safety of lipid-containing products, including food, feed, and industrial materials.
AOCS Ak 2-92
Chlorophyll Content in Rapeseed/Canola (Colza)
AOCS Ca 12a-02
Phosphorus in Oils
This ISO method specifies a colorimetric method for the determination of the phosphorus content of animal and vegetable oils and fats.
AOCS Ca 12-55
Phosphorous in Oils
This method determines phosphorus or the equivalent phosphatide content by ashing the sample in the presence of zinc oxide, followed by the spectrophotometric measurement of phosphorus as a blue phosphomolybdic acid complex.
Compatible Devices: EasyPlus UV/VIS and UV/VIS Excellence Spectrophotometer
AOCS Ca 13-56
Total Gossypol in Crude Cottonseed Oil and Cottonseed Soap Stock
Total gossypol defines gossypol and gossypol derivatives, both free and bound, in cottonseed products that are capable of reacting with 3-amino-1-propanol in dimethylformamide solution to form a diamino-propanol complex, which then reacts with aniline to form dianilinogossypol under the conditions of the test method.
AOCS Cc 8a-52
Bleaching Test for Refined Cottonseed Oil
This method determines the color of the test sample after treatment with a specified bleaching earth under the conditions of this test.
AOCS Cc 8b-52
Bleaching Test for Refined Soybean and Sunflower Oil
This method determines the color of the test sample after treatment with a specified bleaching earth under the conditions of this test.
AOCS Cc 13c-50
Colors of Fat and Oils
This method is designed to examine the color of oil and fat spectrophotometrically.
Compatible Devices: EasyPlus UV/VIS and UV/VIS Excellence Spectrophotometer
AOCS Cc 13d-55
Chlorophyll Pigment in Refined and Bleached Oils
This method is used to determine mg/kg (ppm) of chlorophyll-related pigments (predominantly pheophytin a) in oils from spectrophotometric absorption measurements at 630, 670, and 710 nm.
Compatible Devices: EasyPlus UV/VIS and UV/VIS Excellence Spectrophotometer
AOCS Cc 13i-96
Chlorophyll Pigments in Crude Vegetable Oils
This method determines total chlorophyll pigments, expressed as pheophytin a, in crude vegetable oils. The method is suitable for the determination of quantities of chlorophyll pigments higher than 1 mg/kg (1 ppm).
Compatible Devices: EasyPlus UV/VIS and UV/VIS Excellence Spectrophotometer
AOCS Cc 13k-13
Chlorophyll and Chlorophyll-Related Pigments in Vegetable Oil
This method is used to determine mg/kg (ppm) of chlorophyll in cold-pressed oil (e.g., virgin olive oil) and chlorophyll-related pigments (predominantly pheophytin a) in crude heated oils from spectrophotometric absorption measurements at 630, 670, and 710 nm.
AOCS Cd 7-58
Polyunsaturated Acids in Animal and Vegetable Fats
This spectrophotometric method determines polyunsaturated acids in animal and vegetable fats, focusing on natural cis isomers, small amounts of preformed conjugated material, and pigments with significant absorption changes. The conjugated constituents are determined by measuring the ultraviolet absorption in a purified solvent.
AOCS Cd 18-90
Anisidine value
This method determines the amount of aldehydes (principally 2–alkenals and 2,4–dienals) in animal and vegetable fats and oils, by reaction in an acetic acid solution of the aldehydic compounds in an oil and the p-anisidine, and then measuring the absorbance at 350 nm.
AOCS Ch 4-91
Chlorophyll Pigments in Olive Oils
This method is used to determine mg/kg of chlorophyll-related pigments (predominantly pheophytin a) in oils from spectrophotometric absorption measurements at 630, 670, and 710 nm.
AOCS Ea 9-65
Color by APHA Scale for Glycerin
This method describes a procedure for the measurement of color by comparison with artificial empirical standards.
AOCS Td 2a-64
Color, Photometric Index of Commerical Fatty Acids
This method measures the color of commercial fatty acids and expresses the color as percent transmission at 440 and 550 nm (percent transmittance at 440/550 nm). Alternately, the method can be used to designate a photometric index to characterize the color which is expressed as 100 with the absorbance at each of the two wavelengths, 440 and 550 nm.
AOCS Td 1b-64
Platinum-Cobalt Scale for Light-Colored Liquids
This method determines the color of products that are completely liquid and clear by comparison with artificial standards.
AOCS Ti 1a-64
Conjugated Dienoic Acid in Dehydrated Castor Oils and Acids
This method determines the diene conjugation of unsaturated linkages present, expressing this value as a percentage of conjugated dienoic acid.