Oxidative stability of soybean oil fatty acid methyl esters by oil stability index (OSI) |
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Authors: | Robert O Dunn |
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Affiliation: | (1) Food & Industrial Oils Research, USDA, ARS, NCAUR, 61604 Peoria, Illinois |
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Abstract: | Biodiesel, an alternative diesel fuel derived from transesterification of vegetable oils or animal fats, is composed of saturated
and unsaturated long-chain FA alkyl esters. During long-term storage, oxidation caused by contact with air (autoxidation)
presents a legitimate concern with respect to monitoring and maintaining fuel quality. Extensive oxidative degradation may
compromise quality by adversely affecting kinematic viscosity, acid value, or PV. This work examines the oil stability index
(OSI) as a parameter for monitoring the oxidative stability of soybean oil FAME (SME). SME samples from five separate sources
and with varying storage and handling histories were analyzed for OSI at 60°C using an oxidative stability instrument. Results
showed that OSI may be used to measure relative oxidative stability of SME samples as well as to differentiate between samples
from different producers. Although addition of α-tocopherol or TBHQ increased OSI, responses to these antioxidants varied
with respect to SME sample. Variations in response to added antioxidant were attributed to aging and other effects that may
have caused oxidative degradation in samples prior to acquisition for this study. Results showed that OSI was more sensitive
than iodine value in detecting the effects of oxidative degradation in its early stages when monitoring SME during storage. |
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Keywords: | Antioxidants autoxidation biodiesel oil stability index oxidation oxidative stability |
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