Vernonia anthelmintica: A Potential Seed Oil Source of Epoxy Acid. IV. Effects of Line, Harvest Date, and Seed Storage on Quantity and Quality of Oil1
- G. A. White and
- F. R. Earle2
Pre- and post-frost harvested seeds of Vernonia anthelmintica(L.) Willd. lines PI 283729, VS63-40, and VS65-224 (pre-frost only) were stored under continuous cold, room, and barn (ambient) conditions and sampled at O, 48, and 96 weeks to determine the effects of storage on oil quantity and quality.
Harvest date did not affect oil content. For the prefrost harvest, oil content declined with storage time, especially under room and barn conditions, but the gradual reduction was not of practical significance. The oil percentages for seeds of PI 283729 (26.6%) and VS63-40 (29.9%) significantly exceeded that of VS65-224 (22.0%). Seed oils of the three lines did not differ in amounts of epoxy acid or free fatty acids. Epoxy acid content declined during the period from O to 48 weeks and then rose from 48 to 96 weeks. Time in storage affected epoxy acid content more than storage conditions. The level of free fatty acids remained essentially unchanged during the storage period. Good quality vernonia seeds can be stored for relatively long periods without a serious reduction in oil content or quality.
Poor quality oils with significantly lower levels of epoxy acid and higher levels of free fatty acids were obtained from the post-frost harvest. The oil from PI 283729 seeds was of poorer quality than that from VS63-40 seeds; the quality of both declined in storage at ambient temperatures.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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